Merge pull request #950 from firebase/release-4.11.0

Release 4.11.0

66 files changed, 3919 insertions, 16 deletions

diff --git a/Example/Auth/Sample/MainViewController.m b/Example/Auth/Sample/MainViewController.m
index 36ef92d..f6893d1 100644
--- a/Example/Auth/Sample/MainViewController.m
+++ b/Example/Auth/Sample/MainViewController.m
@@ -96,6 +96,11 @@ static NSString *const kSignInGoogleButtonText = @"Sign in with Google";
  */
 static NSString *const kSignInWithEmailLink = @"Sign in with Email Link";
 
+/** @var kVerifyEmailLinkAccount
+    @brief The text of the "Verify Email-link Account" button.
+ */
+static NSString *const kVerifyEmailLinkAccount = @"Verify Email-link Account";
+
 /** @var kSendEmailSignInLink
     @brief The text of the "Send Email SignIn link" button
 */
@@ -739,6 +744,8 @@ typedef enum {
                                            action:^{ [weakSelf signInGoogle]; }],
         [StaticContentTableViewCell cellWithTitle:kSignInWithEmailLink
                                            action:^{ [weakSelf signInWithEmailLink]; }],
+        [StaticContentTableViewCell cellWithTitle:kVerifyEmailLinkAccount
+                                           action:^{ [weakSelf verifyEmailLinkAccount]; }],
         [StaticContentTableViewCell cellWithTitle:kSendEmailSignInLink
                                            action:^{ [weakSelf sendEmailSignInLink]; }],
         [StaticContentTableViewCell cellWithTitle:kSignInGoogleAndRetrieveDataButtonText
@@ -1784,6 +1791,29 @@ static NSDictionary<NSString *, NSString *> *parseURL(NSString *urlString) {
   }];
 }
 
+/** @fn verifyEmailLinkAccount
+    @brief Invoked to verify that the current user is an email-link user.
+ */
+- (void)verifyEmailLinkAccount {
+  if (![FIRAuth auth].currentUser.email) {
+    [self showMessagePrompt:@"There is no signed-in user available."];
+    return;
+  }
+  [[FIRAuth auth] fetchSignInMethodsForEmail:[FIRAuth auth].currentUser.email
+                                  completion:^(NSArray<NSString *> *_Nullable signInMethods,
+                                               NSError *_Nullable error) {
+    if (error) {
+      [self showMessagePrompt:@"There was an error fetching sign-in methods."];
+      return;
+    }
+    if (![signInMethods containsObject:FIREmailLinkAuthSignInMethod]) {
+      [self showMessagePrompt:@"Error: The current user is NOT an email-link user."];
+      return;
+    }
+    [self showMessagePrompt:@"The current user is an email-link user."];
+  }];
+}
+
 /** @fn sendEmailSignInLink
     @brief Invoked when "Send email sign-in link" row is pressed.
  */
diff --git a/Example/Podfile b/Example/Podfile
index f216308..35d348e 100644
--- a/Example/Podfile
+++ b/Example/Podfile
@@ -8,7 +8,7 @@ target 'Core_Example_iOS' do
   # The next line is the forcing function for the Firebase pod. The Firebase
   # version's subspecs should depend on the component versions in their
   # corresponding podspec's.
-  pod 'Firebase/Core', '4.10.1'
+  pod 'Firebase/Core', '4.11.0'
 
   target 'Core_Tests_iOS' do
     inherit! :search_paths
diff --git a/Firebase/Auth/Source/FIRAuth.m b/Firebase/Auth/Source/FIRAuth.m
index 3b29238..dc3154f 100644
--- a/Firebase/Auth/Source/FIRAuth.m
+++ b/Firebase/Auth/Source/FIRAuth.m
@@ -533,7 +533,7 @@ static NSMutableDictionary *gKeychainServiceNameForAppName;
     FIRCreateAuthURIRequest *request =
         [[FIRCreateAuthURIRequest alloc] initWithIdentifier:email
                                                 continueURI:@"http://www.google.com/"
-                                       requestConfiguration:_requestConfiguration];
+                                       requestConfiguration:self->_requestConfiguration];
     [FIRAuthBackend createAuthURI:request callback:^(FIRCreateAuthURIResponse *_Nullable response,
                                                      NSError *_Nullable error) {
       if (completion) {
@@ -1124,7 +1124,7 @@ static NSMutableDictionary *gKeychainServiceNameForAppName;
     FIRGetOOBConfirmationCodeRequest *request =
         [FIRGetOOBConfirmationCodeRequest signInWithEmailLinkRequest:email
                                                   actionCodeSettings:actionCodeSettings
-                                                requestConfiguration:_requestConfiguration];
+                                                requestConfiguration:self->_requestConfiguration];
     [FIRAuthBackend getOOBConfirmationCode:request
                                   callback:^(FIRGetOOBConfirmationCodeResponse *_Nullable response,
                                              NSError *_Nullable error) {
diff --git a/Firebase/Auth/Source/FIRAuthProvider.m b/Firebase/Auth/Source/FIRAuthProvider.m
index 6df86d7..72a00ef 100644
--- a/Firebase/Auth/Source/FIRAuthProvider.m
+++ b/Firebase/Auth/Source/FIRAuthProvider.m
@@ -16,6 +16,8 @@
 
 #import <Foundation/Foundation.h>
 
+#pragma mark - Provider ID constants
+
 // Declared 'extern' in FIRGoogleAuthProvider.h
 NSString *const FIRGoogleAuthProviderID = @"google.com";
 
@@ -36,3 +38,26 @@ NSString *const FIRGitHubAuthProviderID = @"github.com";
 
 // Declared 'extern' in FIRPhoneAuthProvider.h
 NSString *const FIRPhoneAuthProviderID = @"phone";
+
+#pragma mark - sign-in methods constants
+
+// Declared 'extern' in FIRGoogleAuthProvider.h
+NSString *const FIRGoogleAuthSignInMethod = @"google.com";
+
+// Declared 'extern' in FIREmailAuthProvider.h
+NSString *const FIREmailPasswordAuthSignInMethod = @"password";
+
+// Declared 'extern' in FIREmailAuthProvider.h
+NSString *const FIREmailLinkAuthSignInMethod = @"emailLink";
+
+// Declared 'extern' in FIRTwitterAuthProvider.h
+NSString *const FIRTwitterAuthSignInMethod = @"twitter.com";
+
+// Declared 'extern' in FIRFacebookAuthProvider.h
+NSString *const FIRFacebookAuthSignInMethod = @"facebook.com";
+
+// Declared 'extern' in FIRGitHubAuthProvider.h
+NSString *const FIRGitHubAuthSignInMethod = @"github.com";
+
+// Declared 'extern' in FIRPhoneAuthProvider.h
+NSString *const FIRPhoneAuthSignInMethod = @"phone";
diff --git a/Firebase/Auth/Source/Public/FIREmailAuthProvider.h b/Firebase/Auth/Source/Public/FIREmailAuthProvider.h
index 5823911..b6375bd 100644
--- a/Firebase/Auth/Source/Public/FIREmailAuthProvider.h
+++ b/Firebase/Auth/Source/Public/FIREmailAuthProvider.h
@@ -26,6 +26,17 @@ NS_ASSUME_NONNULL_BEGIN
 extern NSString *const FIREmailAuthProviderID NS_SWIFT_NAME(EmailAuthProviderID);
 
 /**
+    @brief A string constant identifying the email-link sign-in method.
+ */
+extern NSString *const FIREmailLinkAuthSignInMethod NS_SWIFT_NAME(EmailLinkAuthSignInMethod);
+
+/**
+    @brief A string constant identifying the email & password sign-in method.
+ */
+extern NSString *const FIREmailPasswordAuthSignInMethod
+    NS_SWIFT_NAME(EmailPasswordAuthSignInMethod);
+
+/**
     @brief Please use `FIREmailAuthProviderID` for Objective-C or `EmailAuthProviderID` for Swift instead.
  */
 extern NSString *const FIREmailPasswordAuthProviderID __attribute__((deprecated));
diff --git a/Firebase/Auth/Source/Public/FIRFacebookAuthProvider.h b/Firebase/Auth/Source/Public/FIRFacebookAuthProvider.h
index f08740f..75efe13 100644
--- a/Firebase/Auth/Source/Public/FIRFacebookAuthProvider.h
+++ b/Firebase/Auth/Source/Public/FIRFacebookAuthProvider.h
@@ -25,6 +25,11 @@ NS_ASSUME_NONNULL_BEGIN
  */
 extern NSString *const FIRFacebookAuthProviderID NS_SWIFT_NAME(FacebookAuthProviderID);
 
+/**
+    @brief A string constant identifying the Facebook sign-in method.
+ */
+extern NSString *const _Nonnull FIRFacebookAuthSignInMethod NS_SWIFT_NAME(FacebookAuthSignInMethod);
+
 /** @class FIRFacebookAuthProvider
     @brief Utility class for constructing Facebook credentials.
  */
diff --git a/Firebase/Auth/Source/Public/FIRGitHubAuthProvider.h b/Firebase/Auth/Source/Public/FIRGitHubAuthProvider.h
index f0b5dbe..0610427 100644
--- a/Firebase/Auth/Source/Public/FIRGitHubAuthProvider.h
+++ b/Firebase/Auth/Source/Public/FIRGitHubAuthProvider.h
@@ -25,6 +25,12 @@ NS_ASSUME_NONNULL_BEGIN
  */
 extern NSString *const FIRGitHubAuthProviderID NS_SWIFT_NAME(GitHubAuthProviderID);
 
+/**
+    @brief A string constant identifying the GitHub sign-in method.
+ */
+extern NSString *const _Nonnull FIRGitHubAuthSignInMethod NS_SWIFT_NAME(GitHubAuthSignInMethod);
+
+
 /** @class FIRGitHubAuthProvider
     @brief Utility class for constructing GitHub credentials.
  */
diff --git a/Firebase/Auth/Source/Public/FIRGoogleAuthProvider.h b/Firebase/Auth/Source/Public/FIRGoogleAuthProvider.h
index e80d87e..7d6fa22 100644
--- a/Firebase/Auth/Source/Public/FIRGoogleAuthProvider.h
+++ b/Firebase/Auth/Source/Public/FIRGoogleAuthProvider.h
@@ -25,6 +25,11 @@ NS_ASSUME_NONNULL_BEGIN
  */
 extern NSString *const FIRGoogleAuthProviderID NS_SWIFT_NAME(GoogleAuthProviderID);
 
+/**
+    @brief A string constant identifying the Google sign-in method.
+ */
+extern NSString *const _Nonnull FIRGoogleAuthSignInMethod NS_SWIFT_NAME(GoogleAuthSignInMethod);
+
 /** @class FIRGoogleAuthProvider
     @brief Utility class for constructing Google Sign In credentials.
  */
diff --git a/Firebase/Auth/Source/Public/FIRPhoneAuthProvider.h b/Firebase/Auth/Source/Public/FIRPhoneAuthProvider.h
index 34db683..bd68e84 100644
--- a/Firebase/Auth/Source/Public/FIRPhoneAuthProvider.h
+++ b/Firebase/Auth/Source/Public/FIRPhoneAuthProvider.h
@@ -27,6 +27,12 @@ NS_ASSUME_NONNULL_BEGIN
  */
 extern NSString *const FIRPhoneAuthProviderID NS_SWIFT_NAME(PhoneAuthProviderID);
 
+/** @var FIRPhoneAuthProviderID
+    @brief A string constant identifying the phone sign-in method.
+ */
+extern NSString *const _Nonnull FIRPhoneAuthSignInMethod NS_SWIFT_NAME(PhoneAuthSignInMethod);
+
+
 /** @typedef FIRVerificationResultCallback
     @brief The type of block invoked when a request to send a verification code has finished.
 
diff --git a/Firebase/Auth/Source/Public/FIRTwitterAuthProvider.h b/Firebase/Auth/Source/Public/FIRTwitterAuthProvider.h
index 2ef32f7..a0d1166 100644
--- a/Firebase/Auth/Source/Public/FIRTwitterAuthProvider.h
+++ b/Firebase/Auth/Source/Public/FIRTwitterAuthProvider.h
@@ -25,6 +25,12 @@ NS_ASSUME_NONNULL_BEGIN
  */
 extern NSString *const FIRTwitterAuthProviderID NS_SWIFT_NAME(TwitterAuthProviderID);
 
+/**
+    @brief A string constant identifying the Twitter sign-in method.
+ */
+extern NSString *const _Nonnull FIRTwitterAuthSignInMethod NS_SWIFT_NAME(TwitterAuthSignInMethod);
+
+
 /** @class FIRTwitterAuthProvider
     @brief Utility class for constructing Twitter credentials.
  */
diff --git a/Firebase/Core/FIROptions.m b/Firebase/Core/FIROptions.m
index 384ef21..b53fa52 100644
--- a/Firebase/Core/FIROptions.m
+++ b/Firebase/Core/FIROptions.m
@@ -43,7 +43,7 @@ NSString *const kFIRIsSignInEnabled = @"IS_SIGNIN_ENABLED";
 NSString *const kFIRLibraryVersionID =
     @"4"     // Major version (one or more digits)
     @"00"    // Minor version (exactly 2 digits)
-    @"17"    // Build number (exactly 2 digits)
+    @"18"    // Build number (exactly 2 digits)
     @"000";  // Fixed "000"
 // Plist file name.
 NSString *const kServiceInfoFileName = @"GoogleService-Info";
diff --git a/FirebaseAuth.podspec b/FirebaseAuth.podspec
index 1f18d97..549c720 100644
--- a/FirebaseAuth.podspec
+++ b/FirebaseAuth.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseAuth'
-  s.version          = '4.4.4'
+  s.version          = '4.5.0'
   s.summary          = 'The official iOS client for Firebase Authentication'
 
   s.description      = <<-DESC
diff --git a/FirebaseCore.podspec b/FirebaseCore.podspec
index eec8605..583dc39 100644
--- a/FirebaseCore.podspec
+++ b/FirebaseCore.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseCore'
-  s.version          = '4.0.17'
+  s.version          = '4.0.18'
   s.summary          = 'Firebase Core for iOS'
 
   s.description      = <<-DESC
diff --git a/FirebaseFirestore.podspec b/FirebaseFirestore.podspec
index 896dcfb..9af8ec9 100644
--- a/FirebaseFirestore.podspec
+++ b/FirebaseFirestore.podspec
@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'FirebaseFirestore'
-  s.version          = '0.10.3'
+  s.version          = '0.10.4'
   s.summary          = 'Google Cloud Firestore for iOS'
 
   s.description      = <<-DESC
diff --git a/FirebaseFunctions.podspec b/FirebaseFunctions.podspec
new file mode 100644
index 0000000..caf3023
--- /dev/null
+++ b/FirebaseFunctions.podspec
@@ -0,0 +1,33 @@
+#
+# Be sure to run `pod lib lint FirebaseFunctions.podspec' to ensure this is a
+# valid spec before submitting.
+#
+# Any lines starting with a # are optional, but their use is encouraged
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
+#
+
+Pod::Spec.new do |s|
+  s.name             = 'FirebaseFunctions'
+  s.version          = '1.0.0'
+  s.summary          = 'Cloud Functions for Firebase iOS SDK.'
+
+  s.description      = <<-DESC
+iOS SDK for Cloud Functions for Firebase.
+                       DESC
+
+  s.homepage         = 'https://developers.google.com/'
+  s.authors          = 'Google, Inc.'
+  s.source           = { :git => 'https://github.com/TBD/FirebaseFunctions.git', :tag => s.version.to_s }
+
+  s.ios.deployment_target = '8.0'
+
+  s.cocoapods_version = '>= 1.4.0'
+  s.static_framework = true
+  s.prefix_header_file = false
+
+  s.source_files = 'Functions/FirebaseFunctions/**/*'
+  s.public_header_files = 'Functions/FirebaseFunctions/Public/*.h'
+
+  s.dependency 'FirebaseCore', '~> 4.0'
+  s.dependency 'GTMSessionFetcher/Core', '~> 1.1'
+end
diff --git a/Firestore/Example/Podfile b/Firestore/Example/Podfile
index 71afc2b..f7527d2 100644
--- a/Firestore/Example/Podfile
+++ b/Firestore/Example/Podfile
@@ -1,7 +1,7 @@
 # The next line is the forcing function for the Firebase pod. The Firebase
 # version's subspecs should depend on the component versions in their
 # corresponding podspec's.
-pod 'Firebase/Core', '4.10.1'
+pod 'Firebase/Core', '4.11.0'
 
 use_frameworks!
 platform :ios, '8.0'
diff --git a/Firestore/Source/Util/FSTDispatchQueue.mm b/Firestore/Source/Util/FSTDispatchQueue.mm
index 15d6e7b..52482df 100644
--- a/Firestore/Source/Util/FSTDispatchQueue.mm
+++ b/Firestore/Source/Util/FSTDispatchQueue.mm
@@ -230,8 +230,11 @@ NS_ASSUME_NONNULL_BEGIN
                                      block:(void (^)(void))block {
   // While not necessarily harmful, we currently don't expect to have multiple callbacks with the
   // same timerID in the queue, so defensively reject them.
-  FSTAssert(![self containsDelayedCallbackWithTimerID:timerID],
-            @"Attempted to schedule multiple callbacks with id %ld", (unsigned long)timerID);
+  // TODO(b/74749605): If a user change happens while offline we can end up with multiple backoff
+  // callbacks in the dispatch queue. This is non-harmful so I'm just disabling the assert until we
+  // get that cleaned up.
+  // FSTAssert(![self containsDelayedCallbackWithTimerID:timerID],
+  //           @"Attempted to schedule multiple callbacks with id %ld", (unsigned long)timerID);
   FSTDelayedCallback *delayedCallback = [FSTDelayedCallback createAndScheduleWithQueue:self
                                                                                timerID:timerID
                                                                                  delay:delay
diff --git a/Functions/.clang-format b/Functions/.clang-format
new file mode 100644
index 0000000..fb06210
--- /dev/null
+++ b/Functions/.clang-format
@@ -0,0 +1,7 @@
+BasedOnStyle: Google
+ColumnLimit: 100
+BinPackParameters: false
+AllowAllParametersOfDeclarationOnNextLine: true
+ObjCSpaceBeforeProtocolList: false
+SpacesInContainerLiterals: true
+PointerAlignment: Right
diff --git a/Functions/Backend/index.js b/Functions/Backend/index.js
new file mode 100644
index 0000000..0245f1b
--- /dev/null
+++ b/Functions/Backend/index.js
@@ -0,0 +1,95 @@
+const assert = require('assert');
+const functions = require('firebase-functions');
+
+exports.dataTest = functions.https.onRequest((request, response) => {
+  assert.deepEqual(request.body, {
+    data: {
+      bool: true,
+      int: 2,
+      long: {
+        value: '3',
+        '@type': 'type.googleapis.com/google.protobuf.Int64Value',
+      },
+      string: 'four',
+      array: [5, 6],
+      'null': null,
+    }
+  });
+  response.send({
+    data: {
+      message: 'stub response',
+      code: 42,
+      long: {
+        value: '420',
+        '@type': 'type.googleapis.com/google.protobuf.Int64Value',
+      },
+    }
+  });
+});
+
+exports.scalarTest = functions.https.onRequest((request, response) => {
+  assert.deepEqual(request.body, { data: 17 });
+  response.send({ data: 76 });
+});
+
+exports.tokenTest = functions.https.onRequest((request, response) => {
+  assert.equal('Bearer token', request.get('Authorization'));
+  assert.deepEqual(request.body, { data: {} });
+  response.send({ data: {} });
+});
+
+exports.instanceIdTest = functions.https.onRequest((request, response) => {
+  assert.equal(request.get('Firebase-Instance-ID-Token'), 'iid');
+  assert.deepEqual(request.body, { data: {} });
+  response.send({ data: {} });
+});
+
+exports.nullTest = functions.https.onRequest((request, response) => {
+  assert.deepEqual(request.body, { data: null });
+  response.send({ data: null });
+});
+
+exports.missingResultTest = functions.https.onRequest((request, response) => {
+  assert.deepEqual(request.body, { data: null });
+  response.send({});
+});
+
+exports.unhandledErrorTest = functions.https.onRequest((request, response) => {
+  // Fail in a way that the client shouldn't see.
+  throw 'nope';
+});
+
+exports.unknownErrorTest = functions.https.onRequest((request, response) => {
+  // Send an http error with a body with an explicit code.
+  response.status(400).send({
+    error: {
+      status: 'THIS_IS_NOT_VALID',
+      message: 'this should be ignored',
+    },
+  });
+});
+
+exports.explicitErrorTest = functions.https.onRequest((request, response) => {
+  // Send an http error with a body with an explicit code.
+  // Note that eventually the SDK will have a helper to automatically return
+  // the appropriate http status code for an error.
+  response.status(400).send({
+    error: {
+      status: 'OUT_OF_RANGE',
+      message: 'explicit nope',
+      details: {
+        start: 10,
+        end: 20,
+        long: {
+          value: '30',
+          '@type': 'type.googleapis.com/google.protobuf.Int64Value',
+        },
+      },
+    },
+  });
+});
+
+exports.httpErrorTest = functions.https.onRequest((request, response) => {
+  // Send an http error with no body.
+  response.status(400).send();
+});
diff --git a/Functions/Backend/package.json b/Functions/Backend/package.json
new file mode 100644
index 0000000..c227bb1
--- /dev/null
+++ b/Functions/Backend/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "functions",
+  "description": "Cloud Functions for Firebase",
+  "dependencies": {
+    "firebase-admin": "~4.2.1",
+    "firebase-functions": "^0.5.7"
+  },
+  "private": true,
+  "devDependencies": {
+    "@google-cloud/functions-emulator": "^1.0.0-alpha.21"
+  }
+}
diff --git a/Functions/Backend/start.sh b/Functions/Backend/start.sh
new file mode 100755
index 0000000..b09675a
--- /dev/null
+++ b/Functions/Backend/start.sh
@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+
+# Copyright 2018 Google
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Sets up a project with the functions CLI and starts a backend to run
+# integration tests against.
+
+set -e
+
+# Get the absolute path to the directory containing this script.
+SCRIPT_DIR="$(cd $(dirname ${BASH_SOURCE[0]}) && pwd)"
+TEMP_DIR="$(mktemp -d -t firebase-functions)"
+echo "Creating functions in ${TEMP_DIR}"
+
+# Set up the functions directory.
+cp "${SCRIPT_DIR}/index.js" "${TEMP_DIR}/"
+cp "${SCRIPT_DIR}/package.json" "${TEMP_DIR}/"
+cd "${TEMP_DIR}"
+npm install
+
+# Start the server.
+FUNCTIONS_BIN="./node_modules/.bin/functions"
+"${FUNCTIONS_BIN}" config set projectId functions-integration-test
+"${FUNCTIONS_BIN}" config set supervisorPort 5005
+"${FUNCTIONS_BIN}" config set region us-central1
+"${FUNCTIONS_BIN}" config set verbose true
+"${FUNCTIONS_BIN}" restart
+"${FUNCTIONS_BIN}" deploy dataTest --trigger-http
+"${FUNCTIONS_BIN}" deploy scalarTest --trigger-http
+"${FUNCTIONS_BIN}" deploy tokenTest --trigger-http
+"${FUNCTIONS_BIN}" deploy instanceIdTest --trigger-http
+"${FUNCTIONS_BIN}" deploy nullTest --trigger-http
+"${FUNCTIONS_BIN}" deploy missingResultTest --trigger-http
+"${FUNCTIONS_BIN}" deploy unhandledErrorTest --trigger-http
+"${FUNCTIONS_BIN}" deploy unknownErrorTest --trigger-http
+"${FUNCTIONS_BIN}" deploy explicitErrorTest --trigger-http
+"${FUNCTIONS_BIN}" deploy httpErrorTest --trigger-http
+
+# Wait for the user to tell us to stop the server.
+echo "Functions emulator now running in ${TEMP_DIR}."
+read -n 1 -p "*** Press any key to stop the server. ***"
+echo "\nStopping the emulator..."
+"${FUNCTIONS_BIN}" stop
diff --git a/Functions/CHANGELOG.md b/Functions/CHANGELOG.md
new file mode 100644
index 0000000..d2ea864
--- /dev/null
+++ b/Functions/CHANGELOG.md
@@ -0,0 +1,2 @@
+# v1.0.0
+- Initial public release
\ No newline at end of file
diff --git a/Functions/Example/FirebaseFunctions.xcodeproj/project.pbxproj b/Functions/Example/FirebaseFunctions.xcodeproj/project.pbxproj
new file mode 100644
index 0000000..d70f4b5
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions.xcodeproj/project.pbxproj
@@ -0,0 +1,848 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 46;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		6003F58E195388D20070C39A /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 6003F58D195388D20070C39A /* Foundation.framework */; };
+		6003F590195388D20070C39A /* CoreGraphics.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 6003F58F195388D20070C39A /* CoreGraphics.framework */; };
+		6003F592195388D20070C39A /* UIKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 6003F591195388D20070C39A /* UIKit.framework */; };
+		6003F598195388D20070C39A /* InfoPlist.strings in Resources */ = {isa = PBXBuildFile; fileRef = 6003F596195388D20070C39A /* InfoPlist.strings */; };
+		6003F59A195388D20070C39A /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = 6003F599195388D20070C39A /* main.m */; };
+		6003F59E195388D20070C39A /* FIRAppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 6003F59D195388D20070C39A /* FIRAppDelegate.m */; };
+		6003F5A7195388D20070C39A /* FIRViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 6003F5A6195388D20070C39A /* FIRViewController.m */; };
+		6003F5A9195388D20070C39A /* Images.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 6003F5A8195388D20070C39A /* Images.xcassets */; };
+		6003F5B0195388D20070C39A /* XCTest.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 6003F5AF195388D20070C39A /* XCTest.framework */; };
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+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/FirebaseFunctions_Example.app/FirebaseFunctions_Example";
+				WRAPPER_EXTENSION = xctest;
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		6003F585195388D10070C39A /* Build configuration list for PBXProject "FirebaseFunctions" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				6003F5BD195388D20070C39A /* Debug */,
+				6003F5BE195388D20070C39A /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		6003F5BF195388D20070C39A /* Build configuration list for PBXNativeTarget "FirebaseFunctions_Example" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				6003F5C0195388D20070C39A /* Debug */,
+				6003F5C1195388D20070C39A /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		6003F5C2195388D20070C39A /* Build configuration list for PBXNativeTarget "FirebaseFunctions_Tests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				6003F5C3195388D20070C39A /* Debug */,
+				6003F5C4195388D20070C39A /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		7CBFAA8E205702AB00A65866 /* Build configuration list for PBXNativeTarget "FirebaseFunctions_IntegrationTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				7CBFAA8F205702AB00A65866 /* Debug */,
+				7CBFAA90205702AB00A65866 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 6003F582195388D10070C39A /* Project object */;
+}
diff --git a/Functions/Example/FirebaseFunctions.xcodeproj/xcshareddata/xcschemes/FirebaseFunctions-Example.xcscheme b/Functions/Example/FirebaseFunctions.xcodeproj/xcshareddata/xcschemes/FirebaseFunctions-Example.xcscheme
new file mode 100644
index 0000000..b9983e8
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions.xcodeproj/xcshareddata/xcschemes/FirebaseFunctions-Example.xcscheme
@@ -0,0 +1,113 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0720"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "6003F589195388D20070C39A"
+               BuildableName = "FirebaseFunctions_Example.app"
+               BlueprintName = "FirebaseFunctions_Example"
+               ReferencedContainer = "container:FirebaseFunctions.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "6003F5AD195388D20070C39A"
+               BuildableName = "FirebaseFunctions_Tests.xctest"
+               BlueprintName = "FirebaseFunctions_Tests"
+               ReferencedContainer = "container:FirebaseFunctions.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "7CBFAA7D205702AB00A65866"
+               BuildableName = "FirebaseFunctions_IntegrationTests.xctest"
+               BlueprintName = "FirebaseFunctions_IntegrationTests"
+               ReferencedContainer = "container:FirebaseFunctions.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "6003F589195388D20070C39A"
+            BuildableName = "FirebaseFunctions_Example.app"
+            BlueprintName = "FirebaseFunctions_Example"
+            ReferencedContainer = "container:FirebaseFunctions.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "6003F589195388D20070C39A"
+            BuildableName = "FirebaseFunctions_Example.app"
+            BlueprintName = "FirebaseFunctions_Example"
+            ReferencedContainer = "container:FirebaseFunctions.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "6003F589195388D20070C39A"
+            BuildableName = "FirebaseFunctions_Example.app"
+            BlueprintName = "FirebaseFunctions_Example"
+            ReferencedContainer = "container:FirebaseFunctions.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/Functions/Example/FirebaseFunctions.xcodeproj/xcshareddata/xcschemes/FirebaseFunctions_IntegrationTests.xcscheme b/Functions/Example/FirebaseFunctions.xcodeproj/xcshareddata/xcschemes/FirebaseFunctions_IntegrationTests.xcscheme
new file mode 100644
index 0000000..46914fb
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions.xcodeproj/xcshareddata/xcschemes/FirebaseFunctions_IntegrationTests.xcscheme
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0930"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "7CBFAA7D205702AB00A65866"
+               BuildableName = "FirebaseFunctions_IntegrationTests.xctest"
+               BlueprintName = "FirebaseFunctions_IntegrationTests"
+               ReferencedContainer = "container:FirebaseFunctions.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/Functions/Example/FirebaseFunctions.xcodeproj/xcshareddata/xcschemes/FirebaseFunctions_Tests.xcscheme b/Functions/Example/FirebaseFunctions.xcodeproj/xcshareddata/xcschemes/FirebaseFunctions_Tests.xcscheme
new file mode 100644
index 0000000..26063f9
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions.xcodeproj/xcshareddata/xcschemes/FirebaseFunctions_Tests.xcscheme
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0930"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "6003F5AD195388D20070C39A"
+               BuildableName = "FirebaseFunctions_Tests.xctest"
+               BlueprintName = "FirebaseFunctions_Tests"
+               ReferencedContainer = "container:FirebaseFunctions.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/Functions/Example/FirebaseFunctions/Base.lproj/LaunchScreen.storyboard b/Functions/Example/FirebaseFunctions/Base.lproj/LaunchScreen.storyboard
new file mode 100644
index 0000000..66a7681
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/Base.lproj/LaunchScreen.storyboard
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="16C67" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
+                        <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>
diff --git a/Functions/Example/FirebaseFunctions/Base.lproj/Main.storyboard b/Functions/Example/FirebaseFunctions/Base.lproj/Main.storyboard
new file mode 100644
index 0000000..d164a23
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/Base.lproj/Main.storyboard
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="7706" systemVersion="14D136" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="whP-gf-Uak">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7703"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="wQg-tq-qST">
+            <objects>
+                <viewController id="whP-gf-Uak" customClass="FIRViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="uEw-UM-LJ8"/>
+                        <viewControllerLayoutGuide type="bottom" id="Mvr-aV-6Um"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="TpU-gO-2f1">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="tc2-Qw-aMS" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="305" y="433"/>
+        </scene>
+    </scenes>
+</document>
diff --git a/Functions/Example/FirebaseFunctions/FIRAppDelegate.h b/Functions/Example/FirebaseFunctions/FIRAppDelegate.h
new file mode 100644
index 0000000..1d6d40b
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/FIRAppDelegate.h
@@ -0,0 +1,21 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+@import UIKit;
+
+@interface FIRAppDelegate : UIResponder<UIApplicationDelegate>
+
+@property(strong, nonatomic) UIWindow *window;
+
+@end
diff --git a/Functions/Example/FirebaseFunctions/FIRAppDelegate.m b/Functions/Example/FirebaseFunctions/FIRAppDelegate.m
new file mode 100644
index 0000000..9568d06
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/FIRAppDelegate.m
@@ -0,0 +1,55 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "FIRAppDelegate.h"
+
+@implementation FIRAppDelegate
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  // Override point for customization after application launch.
+  return YES;
+}
+
+- (void)applicationWillResignActive:(UIApplication *)application {
+  // Sent when the application is about to move from active to inactive state. This can occur for
+  // certain types of temporary interruptions (such as an incoming phone call or SMS message) or
+  // when the user quits the application and it begins the transition to the background state. Use
+  // this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates.
+  // Games should use this method to pause the game.
+}
+
+- (void)applicationDidEnterBackground:(UIApplication *)application {
+  // Use this method to release shared resources, save user data, invalidate timers, and store
+  // enough application state information to restore your application to its current state in case
+  // it is terminated later. If your application supports background execution, this method is
+  // called instead of applicationWillTerminate: when the user quits.
+}
+
+- (void)applicationWillEnterForeground:(UIApplication *)application {
+  // Called as part of the transition from the background to the inactive state; here you can undo
+  // many of the changes made on entering the background.
+}
+
+- (void)applicationDidBecomeActive:(UIApplication *)application {
+  // Restart any tasks that were paused (or not yet started) while the application was inactive. If
+  // the application was previously in the background, optionally refresh the user interface.
+}
+
+- (void)applicationWillTerminate:(UIApplication *)application {
+  // Called when the application is about to terminate. Save data if appropriate. See also
+  // applicationDidEnterBackground:.
+}
+
+@end
diff --git a/Functions/Example/FirebaseFunctions/FIRViewController.h b/Functions/Example/FirebaseFunctions/FIRViewController.h
new file mode 100644
index 0000000..5c4dff5
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/FIRViewController.h
@@ -0,0 +1,19 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+@import UIKit;
+
+@interface FIRViewController : UIViewController
+
+@end
diff --git a/Functions/Example/FirebaseFunctions/FIRViewController.m b/Functions/Example/FirebaseFunctions/FIRViewController.m
new file mode 100644
index 0000000..027aabf
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/FIRViewController.m
@@ -0,0 +1,33 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "FIRViewController.h"
+
+@interface FIRViewController ()
+
+@end
+
+@implementation FIRViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+  // Do any additional setup after loading the view, typically from a nib.
+}
+
+- (void)didReceiveMemoryWarning {
+  [super didReceiveMemoryWarning];
+  // Dispose of any resources that can be recreated.
+}
+
+@end
diff --git a/Functions/Example/FirebaseFunctions/FirebaseFunctions-Info.plist b/Functions/Example/FirebaseFunctions/FirebaseFunctions-Info.plist
new file mode 100644
index 0000000..fc26896
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/FirebaseFunctions-Info.plist
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleDisplayName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1.0</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsArbitraryLoads</key>
+		<true/>
+	</dict>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>
diff --git a/Functions/Example/FirebaseFunctions/Images.xcassets/AppIcon.appiconset/Contents.json b/Functions/Example/FirebaseFunctions/Images.xcassets/AppIcon.appiconset/Contents.json
new file mode 100644
index 0000000..d7070bc
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/Images.xcassets/AppIcon.appiconset/Contents.json
@@ -0,0 +1,93 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
diff --git a/Functions/Example/FirebaseFunctions/en.lproj/InfoPlist.strings b/Functions/Example/FirebaseFunctions/en.lproj/InfoPlist.strings
new file mode 100644
index 0000000..477b28f
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/en.lproj/InfoPlist.strings
@@ -0,0 +1,2 @@
+/* Localized versions of Info.plist keys */
+
diff --git a/Functions/Example/FirebaseFunctions/main.m b/Functions/Example/FirebaseFunctions/main.m
new file mode 100644
index 0000000..39c05a5
--- /dev/null
+++ b/Functions/Example/FirebaseFunctions/main.m
@@ -0,0 +1,22 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+@import UIKit;
+#import "FIRAppDelegate.h"
+
+int main(int argc, char* argv[]) {
+  @autoreleasepool {
+    return UIApplicationMain(argc, argv, nil, NSStringFromClass([FIRAppDelegate class]));
+  }
+}
diff --git a/Functions/Example/IntegrationTests/FIRIntegrationTests.m b/Functions/Example/IntegrationTests/FIRIntegrationTests.m
new file mode 100644
index 0000000..15a5af5
--- /dev/null
+++ b/Functions/Example/IntegrationTests/FIRIntegrationTests.m
@@ -0,0 +1,190 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+@import XCTest;
+
+#import "FIRError.h"
+#import "FIRFunctions+Internal.h"
+#import "FIRFunctions.h"
+#import "FIRHTTPSCallable.h"
+#import "FUNFakeApp.h"
+#import "FUNFakeInstanceID.h"
+
+@interface FIRIntegrationTests : XCTestCase {
+  FIRFunctions *_functions;
+}
+@end
+
+@implementation FIRIntegrationTests
+
+- (void)setUp {
+  [super setUp];
+  id app = [[FUNFakeApp alloc] initWithProjectID:@"functions-integration-test"];
+  _functions = [FIRFunctions functionsForApp:app];
+  [_functions useLocalhost];
+}
+
+- (void)tearDown {
+  [super tearDown];
+}
+
+- (void)testData {
+  NSDictionary *data = @{
+    @"bool" : @YES,
+    @"int" : @2,
+    @"long" : @3L,
+    @"string" : @"four",
+    @"array" : @[ @5, @6 ],
+    @"null" : [NSNull null],
+  };
+
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [_functions HTTPSCallableWithName:@"dataTest"];
+  [function callWithObject:data
+                completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+                  XCTAssertNil(error);
+                  XCTAssertEqualObjects(@"stub response", result.data[@"message"]);
+                  XCTAssertEqualObjects(@42, result.data[@"code"]);
+                  XCTAssertEqualObjects(@420L, result.data[@"long"]);
+                  [expectation fulfill];
+                }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+- (void)testScalar {
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [_functions HTTPSCallableWithName:@"scalarTest"];
+  [function callWithObject:@17
+                completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+                  XCTAssertNil(error);
+                  XCTAssertEqualObjects(@76, result.data);
+                  [expectation fulfill];
+                }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+- (void)testToken {
+  // Recreate _functions with a token.
+  id app = [[FUNFakeApp alloc] initWithProjectID:@"functions-integration-test" token:@"token"];
+  FIRFunctions *functions = [FIRFunctions functionsForApp:app];
+  [functions useLocalhost];
+
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [functions HTTPSCallableWithName:@"tokenTest"];
+  [function callWithObject:@{}
+      completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+        XCTAssertNil(error);
+        XCTAssertEqualObjects(@{}, result.data);
+        [expectation fulfill];
+      }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+- (void)testInstanceID {
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [_functions HTTPSCallableWithName:@"instanceIdTest"];
+  [function callWithObject:@{}
+      completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+        XCTAssertNil(error);
+        XCTAssertEqualObjects(@{}, result.data);
+        [expectation fulfill];
+      }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+- (void)testNull {
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [_functions HTTPSCallableWithName:@"nullTest"];
+  [function callWithObject:[NSNull null]
+                completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+                  XCTAssertEqualObjects([NSNull null], result.data);
+                  XCTAssertNil(error);
+                  [expectation fulfill];
+                }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+
+  // Test the version with no arguments.
+  [function
+      callWithCompletion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+        XCTAssertEqualObjects([NSNull null], result.data);
+        XCTAssertNil(error);
+        [expectation fulfill];
+      }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+- (void)testMissingResult {
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [_functions HTTPSCallableWithName:@"missingResultTest"];
+  [function
+      callWithCompletion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+        XCTAssertNotNil(error);
+        XCTAssertEqual(FIRFunctionsErrorCodeInternal, error.code);
+        [expectation fulfill];
+      }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+- (void)testUnhandledError {
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [_functions HTTPSCallableWithName:@"unhandledErrorTest"];
+  [function callWithObject:@{}
+      completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+        XCTAssertNotNil(error);
+        XCTAssertEqual(FIRFunctionsErrorCodeInternal, error.code);
+        [expectation fulfill];
+      }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+- (void)testUnknownError {
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [_functions HTTPSCallableWithName:@"unknownErrorTest"];
+  [function callWithObject:@{}
+      completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+        XCTAssertNotNil(error);
+        XCTAssertEqual(FIRFunctionsErrorCodeInternal, error.code);
+        [expectation fulfill];
+      }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+- (void)testExplicitError {
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [_functions HTTPSCallableWithName:@"explicitErrorTest"];
+  [function callWithObject:@{}
+      completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+        XCTAssertNotNil(error);
+        XCTAssertEqual(FIRFunctionsErrorCodeOutOfRange, error.code);
+        XCTAssertEqualObjects(@"explicit nope", error.userInfo[NSLocalizedDescriptionKey]);
+        NSDictionary *expectedDetails = @{ @"start" : @10, @"end" : @20, @"long" : @30L };
+        XCTAssertEqualObjects(expectedDetails, error.userInfo[FIRFunctionsErrorDetailsKey]);
+        [expectation fulfill];
+      }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+- (void)testHttpError {
+  XCTestExpectation *expectation = [[XCTestExpectation alloc] init];
+  FIRHTTPSCallable *function = [_functions HTTPSCallableWithName:@"httpErrorTest"];
+  [function callWithObject:@{}
+      completion:^(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error) {
+        XCTAssertNotNil(error);
+        XCTAssertEqual(FIRFunctionsErrorCodeInvalidArgument, error.code);
+        [expectation fulfill];
+      }];
+  [self waitForExpectations:@[ expectation ] timeout:10];
+}
+
+@end
diff --git a/Functions/Example/IntegrationTests/IntegrationTests-Info.plist b/Functions/Example/IntegrationTests/IntegrationTests-Info.plist
new file mode 100644
index 0000000..169b6f7
--- /dev/null
+++ b/Functions/Example/IntegrationTests/IntegrationTests-Info.plist
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
diff --git a/Functions/Example/Podfile b/Functions/Example/Podfile
new file mode 100644
index 0000000..ea07e11
--- /dev/null
+++ b/Functions/Example/Podfile
@@ -0,0 +1,16 @@
+use_frameworks!
+
+target 'FirebaseFunctions_Example' do
+  platform :ios, '8.0'
+
+  pod 'FirebaseCore', :path => '../../'
+  pod 'FirebaseFunctions', :path => '../../'
+
+  target 'FirebaseFunctions_Tests' do
+    inherit! :search_paths
+  end
+
+  target 'FirebaseFunctions_IntegrationTests' do
+    inherit! :search_paths
+  end
+end
diff --git a/Functions/Example/TestUtils/FUNFakeApp.h b/Functions/Example/TestUtils/FUNFakeApp.h
new file mode 100644
index 0000000..d07262b
--- /dev/null
+++ b/Functions/Example/TestUtils/FUNFakeApp.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+@class FUNFakeOptions;
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * FUNFakeApp is a mock app to use for tests.
+ */
+@interface FUNFakeApp : NSObject
+
+- (id)init NS_UNAVAILABLE;
+
+- (instancetype)initWithProjectID:(NSString *)projectID;
+
+- (instancetype)initWithProjectID:(NSString *)projectID
+                            token:(NSString *_Nullable)token NS_DESIGNATED_INITIALIZER;
+
+@property(nonatomic, strong, readonly) FUNFakeOptions *options;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/Example/TestUtils/FUNFakeApp.m b/Functions/Example/TestUtils/FUNFakeApp.m
new file mode 100644
index 0000000..5b31d01
--- /dev/null
+++ b/Functions/Example/TestUtils/FUNFakeApp.m
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FUNFakeApp.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FUNFakeOptions : NSObject
+
+@property(nonatomic, readonly, copy) NSString *projectID;
+
+- (id)init NS_UNAVAILABLE;
+
+- (instancetype)initWithProjectID:(NSString *)projectID NS_DESIGNATED_INITIALIZER;
+
+@end
+
+@implementation FUNFakeOptions
+
+- (instancetype)initWithProjectID:(NSString *)projectID {
+  self = [super init];
+  if (self) {
+    self->_projectID = [projectID copy];
+  }
+  return self;
+}
+
+@end
+
+@interface FUNFakeApp () {
+  NSString *_token;
+}
+@end
+
+@implementation FUNFakeApp
+
+- (instancetype)initWithProjectID:(NSString *)projectID {
+  return [self initWithProjectID:projectID token:nil];
+}
+
+- (instancetype)initWithProjectID:(NSString *)projectID token:(NSString *_Nullable)token {
+  self = [super init];
+  if (self) {
+    _options = [[FUNFakeOptions alloc] initWithProjectID:projectID];
+    _token = [token copy];
+  }
+  return self;
+}
+
+- (void)getTokenForcingRefresh:(BOOL)forceRefresh
+                  withCallback:
+                      (void (^)(NSString *_Nullable token, NSError *_Nullable error))callback {
+  callback(_token, nil);
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/Example/TestUtils/FUNFakeInstanceID.h b/Functions/Example/TestUtils/FUNFakeInstanceID.h
new file mode 100644
index 0000000..9925410
--- /dev/null
+++ b/Functions/Example/TestUtils/FUNFakeInstanceID.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * This FIRInstanceID is a mock instance ID provider to use for tests.
+ * Since FirebaseFunctions loads FIRInstanceID as a weak dependency by reflection, we just have to
+ * make a class with the same name.
+ */
+@interface FIRInstanceID : NSObject
+
++ (instancetype)instanceID;
+
+- (NSString *)token;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/Example/TestUtils/FUNFakeInstanceID.m b/Functions/Example/TestUtils/FUNFakeInstanceID.m
new file mode 100644
index 0000000..a81e67a
--- /dev/null
+++ b/Functions/Example/TestUtils/FUNFakeInstanceID.m
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FUNFakeInstanceID.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@implementation FIRInstanceID
+
++ (instancetype)instanceID {
+  return [[FIRInstanceID alloc] init];
+}
+
+- (NSString *)token {
+  return @"iid";
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/Example/Tests/FIRFunctionsTests.m b/Functions/Example/Tests/FIRFunctionsTests.m
new file mode 100644
index 0000000..bec96e6
--- /dev/null
+++ b/Functions/Example/Tests/FIRFunctionsTests.m
@@ -0,0 +1,50 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+@import XCTest;
+
+#import "FIRFunctions+Internal.h"
+#import "FIRFunctions.h"
+
+#import "FUNFakeApp.h"
+
+@interface FIRFunctionsTests : XCTestCase
+@end
+
+@implementation FIRFunctionsTests
+
+- (void)setUp {
+  [super setUp];
+}
+
+- (void)tearDown {
+  [super tearDown];
+}
+
+- (void)testURLWithName {
+  // TODO(klimt): Add this test back when we add the constructor back.
+  /*
+  id app = [[FUNFakeApp alloc] initWithProjectID:@"my-project"];
+  FIRFunctions *functions = [FIRFunctions functionsForApp:app region:@"my-region"];
+  NSString *url = [functions URLWithName:@"my-endpoint"];
+  XCTAssertEqualObjects(@"https://my-region-my-project.cloudfunctions.net/my-endpoint", url);
+  */
+
+  id app = [[FUNFakeApp alloc] initWithProjectID:@"my-project"];
+  FIRFunctions *functions = [FIRFunctions functionsForApp:app];
+  NSString *url = [functions URLWithName:@"my-endpoint"];
+  XCTAssertEqualObjects(@"https://us-central1-my-project.cloudfunctions.net/my-endpoint", url);
+}
+
+@end
diff --git a/Functions/Example/Tests/FUNSerializerTests.m b/Functions/Example/Tests/FUNSerializerTests.m
new file mode 100644
index 0000000..707c3e7
--- /dev/null
+++ b/Functions/Example/Tests/FUNSerializerTests.m
@@ -0,0 +1,240 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+@import XCTest;
+
+#import "FIRError.h"
+#import "FUNSerializer.h"
+
+@interface FUNSerializerTests : XCTestCase
+@end
+
+@implementation FUNSerializerTests
+
+- (void)setUp {
+  [super setUp];
+}
+
+- (void)tearDown {
+  [super tearDown];
+}
+
+- (void)testEncodeNull {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  XCTAssertEqualObjects([NSNull null], [serializer encode:[NSNull null]]);
+}
+
+- (void)testDecodeNull {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSError *error = nil;
+  XCTAssertEqualObjects([NSNull null], [serializer decode:[NSNull null] error:&error]);
+  XCTAssertNil(error);
+}
+
+- (void)testEncodeInt {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  XCTAssertEqualObjects(@1, [serializer encode:@1]);
+}
+
+- (void)testDecodeInt {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSError *error = nil;
+  XCTAssertEqualObjects(@1, [serializer decode:@1 error:&error]);
+  XCTAssertNil(error);
+}
+
+- (void)testEncodeLong {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSDictionary *expected = @{
+    @"@type" : @"type.googleapis.com/google.protobuf.Int64Value",
+    @"value" : @"-9223372036854775800",
+  };
+  XCTAssertEqualObjects(expected, [serializer encode:@-9223372036854775800L]);
+}
+
+- (void)testDecodeLong {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSDictionary *input = @{
+    @"@type" : @"type.googleapis.com/google.protobuf.Int64Value",
+    @"value" : @"-9223372036854775800",
+  };
+  NSError *error = nil;
+  NSNumber *actual = [serializer decode:input error:&error];
+  XCTAssertEqualObjects(@-9223372036854775800L, actual);
+  // A naive implementation might convert a number to a double and think that's close enough.
+  // We need to make sure it's a long long for accuracy.
+  XCTAssertEqual('q', actual.objCType[0]);
+  XCTAssertNil(error);
+}
+
+- (void)testDecodeInvalidLong {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSDictionary *input = @{
+    @"@type" : @"type.googleapis.com/google.protobuf.Int64Value",
+    @"value" : @"-9223372036854775800 and some other junk",
+  };
+  NSError *error = nil;
+  NSNumber *actual = [serializer decode:input error:&error];
+  XCTAssertNil(actual);
+  XCTAssertNotNil(error);
+  XCTAssertEqualObjects(FIRFunctionsErrorDomain, error.domain);
+  XCTAssertEqual(FIRFunctionsErrorCodeInternal, error.code);
+}
+
+- (void)testEncodeUnsignedLong {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSDictionary *expected = @{
+    @"@type" : @"type.googleapis.com/google.protobuf.UInt64Value",
+    @"value" : @"18446744073709551600",
+  };
+  XCTAssertEqualObjects(expected, [serializer encode:@18446744073709551600UL]);
+}
+
+- (void)testDecodeUnsignedLong {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSDictionary *input = @{
+    @"@type" : @"type.googleapis.com/google.protobuf.UInt64Value",
+    @"value" : @"17446744073709551688",
+  };
+  NSError *error = nil;
+  NSNumber *actual = [serializer decode:input error:&error];
+  XCTAssertEqualObjects(@17446744073709551688UL, actual);
+  // A naive NSNumberFormatter implementation will convert the number to a double and think
+  // that's close enough. We need to make sure it's an unsigned long long for accuracy.
+  XCTAssertEqual('Q', actual.objCType[0]);
+  XCTAssertNil(error);
+}
+
+- (void)testEncodeDouble {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  XCTAssertEqualObjects(@1.2, [serializer encode:@1.2]);
+}
+
+- (void)testDecodeDouble {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSError *error = nil;
+  XCTAssertEqualObjects(@1.2, [serializer decode:@1.2 error:&error]);
+  XCTAssertNil(error);
+}
+
+- (void)testEncodeBool {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  XCTAssertEqualObjects(@YES, [serializer encode:@YES]);
+}
+
+- (void)testDecodeBool {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSError *error = nil;
+  XCTAssertEqualObjects(@NO, [serializer decode:@NO error:&error]);
+  XCTAssertNil(error);
+}
+
+- (void)testEncodeString {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  XCTAssertEqualObjects(@"hello", [serializer encode:@"hello"]);
+}
+
+- (void)testDecodeString {
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSError *error = nil;
+  XCTAssertEqualObjects(@"hello", [serializer decode:@"hello" error:&error]);
+  XCTAssertNil(error);
+}
+
+- (void)testEncodeArray {
+  NSArray *input = @[ @1, @"two", @[ @3, @4L ] ];
+  NSArray *expected = @[
+    @1, @"two",
+    @[
+      @3, @{
+        @"@type" : @"type.googleapis.com/google.protobuf.Int64Value",
+        @"value" : @"4",
+      }
+    ]
+  ];
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  XCTAssertEqualObjects(expected, [serializer encode:input]);
+}
+
+- (void)testDecodeArray {
+  NSArray *input = @[
+    @1, @"two",
+    @[
+      @3, @{
+        @"@type" : @"type.googleapis.com/google.protobuf.Int64Value",
+        @"value" : @"4",
+      }
+    ]
+  ];
+  NSArray *expected = @[ @1, @"two", @[ @3, @4L ] ];
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSError *error = nil;
+
+  XCTAssertEqualObjects(expected, [serializer decode:input error:&error]);
+  XCTAssertNil(error);
+}
+
+- (void)testEncodeMap {
+  NSDictionary *input = @{ @"foo" : @1, @"bar" : @"hello", @"baz" : @[ @3, @4L ] };
+  NSDictionary *expected = @{
+    @"foo" : @1,
+    @"bar" : @"hello",
+    @"baz" : @[
+      @3, @{
+        @"@type" : @"type.googleapis.com/google.protobuf.Int64Value",
+        @"value" : @"4",
+      }
+    ]
+  };
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  XCTAssertEqualObjects(expected, [serializer encode:input]);
+}
+
+- (void)testDecodeMap {
+  NSDictionary *input = @{
+    @"foo" : @1,
+    @"bar" : @"hello",
+    @"baz" : @[
+      @3, @{
+        @"@type" : @"type.googleapis.com/google.protobuf.Int64Value",
+        @"value" : @"4",
+      }
+    ]
+  };
+  NSDictionary *expected = @{ @"foo" : @1, @"bar" : @"hello", @"baz" : @[ @3, @4L ] };
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSError *error = nil;
+  XCTAssertEqualObjects(expected, [serializer decode:input error:&error]);
+  XCTAssertNil(error);
+}
+
+- (void)testDecodeUnknownType {
+  NSDictionary *input = @{@"@type" : @"unknown", @"value" : @"whatever"};
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSError *error = nil;
+  XCTAssertEqualObjects(input, [serializer decode:input error:&error]);
+  XCTAssertNil(error);
+}
+
+- (void)testDecodeUnknownTypeWithoutValue {
+  NSDictionary *input = @{
+    @"@type" : @"unknown",
+  };
+  FUNSerializer *serializer = [[FUNSerializer alloc] init];
+  NSError *error = nil;
+  XCTAssertEqualObjects(input, [serializer decode:input error:&error]);
+  XCTAssertNil(error);
+}
+
+@end
diff --git a/Functions/Example/Tests/Tests-Info.plist b/Functions/Example/Tests/Tests-Info.plist
new file mode 100644
index 0000000..169b6f7
--- /dev/null
+++ b/Functions/Example/Tests/Tests-Info.plist
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
diff --git a/Functions/Example/Tests/en.lproj/InfoPlist.strings b/Functions/Example/Tests/en.lproj/InfoPlist.strings
new file mode 100644
index 0000000..477b28f
--- /dev/null
+++ b/Functions/Example/Tests/en.lproj/InfoPlist.strings
@@ -0,0 +1,2 @@
+/* Localized versions of Info.plist keys */
+
diff --git a/Functions/FirebaseFunctions/FIRFunctions+Internal.h b/Functions/FirebaseFunctions/FIRFunctions+Internal.h
new file mode 100644
index 0000000..6c555f0
--- /dev/null
+++ b/Functions/FirebaseFunctions/FIRFunctions+Internal.h
@@ -0,0 +1,50 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+#import "FIRFunctions.h"
+
+@class FIRHTTPSCallableResult;
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FIRFunctions (Internal)
+
+/**
+ * Calls an http trigger endpoint.
+ * @param name The name of the http trigger.
+ * @param data Parameters to pass to the function. Can be anything encodable as JSON.
+ * @param completion The block to call when the request is complete.
+ */
+- (void)callFunction:(NSString *)name
+          withObject:(nullable id)data
+          completion:(void (^)(FIRHTTPSCallableResult *_Nullable result,
+                               NSError *_Nullable error))completion;
+
+/**
+ * Constructs the url for an http trigger. This is exposed only for testing.
+ * @param name The name of the endpoint.
+ */
+- (NSString *)URLWithName:(NSString *)name;
+
+/**
+ * Sets the functions client to send requests to localhost instead of Firebase.
+ * For testing only.
+ */
+- (void)useLocalhost;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FIRFunctions.m b/Functions/FirebaseFunctions/FIRFunctions.m
new file mode 100644
index 0000000..274d058
--- /dev/null
+++ b/Functions/FirebaseFunctions/FIRFunctions.m
@@ -0,0 +1,247 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "FIRFunctions.h"
+#import "FIRFunctions+Internal.h"
+
+#import "FIRError.h"
+#import "FIRHTTPSCallable+Internal.h"
+#import "FIRHTTPSCallable.h"
+#import "FUNContext.h"
+#import "FUNError.h"
+#import "FUNSerializer.h"
+#import "FUNUsageValidation.h"
+
+#import "FIRApp.h"
+#import "FIRAppInternal.h"
+#import "FIROptions.h"
+#import "GTMSessionFetcherService.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+NSString *const kFUNInstanceIDTokenHeader = @"Firebase-Instance-ID-Token";
+
+@interface FIRFunctions () {
+  // The network client to use for http requests.
+  GTMSessionFetcherService *_fetcherService;
+  // The projectID to use for all function references.
+  FIRApp *_app;
+  // The region to use for all function references.
+  NSString *_region;
+  // A serializer to encode/decode data and return values.
+  FUNSerializer *_serializer;
+  // A factory for getting the metadata to include with function calls.
+  FUNContextProvider *_contextProvider;
+  // For testing only. If this is set, functions will be called against localhost instead of
+  // Firebase.
+  BOOL _useLocalhost;
+}
+
+/**
+ * Initialize the Cloud Functions client with the given app and region.
+ * @param app The app for the Firebase project.
+ * @param region The region for the http trigger, such as "us-central1".
+ */
+- (id)initWithApp:(FIRApp *)app region:(NSString *)region NS_DESIGNATED_INITIALIZER;
+
+@end
+
+@implementation FIRFunctions
+
++ (instancetype)functions {
+  return [[self alloc] initWithApp:[FIRApp defaultApp] region:@"us-central1"];
+}
+
++ (instancetype)functionsForApp:(FIRApp *)app {
+  return [[self alloc] initWithApp:app region:@"us-central1"];
+}
+
++ (instancetype)functionsForRegion:(NSString *)region {
+  return [[self alloc] initWithApp:[FIRApp defaultApp] region:region];
+}
+
++ (instancetype)functionsForApp:(FIRApp *)app region:(NSString *)region {
+  return [[self alloc] initWithApp:app region:region];
+}
+
+- (instancetype)initWithApp:(FIRApp *)app region:(NSString *)region {
+  self = [super init];
+  if (self) {
+    if (!region) {
+      FUNThrowInvalidArgument(@"FIRFunctions region cannot be nil.");
+    }
+    _fetcherService = [[GTMSessionFetcherService alloc] init];
+    _app = app;
+    _region = [region copy];
+    _serializer = [[FUNSerializer alloc] init];
+    _contextProvider = [[FUNContextProvider alloc] initWithApp:app];
+    _useLocalhost = NO;
+  }
+  return self;
+}
+
+- (void)useLocalhost {
+  _useLocalhost = YES;
+}
+
+- (NSString *)URLWithName:(NSString *)name {
+  if (!name) {
+    FUNThrowInvalidArgument(@"FIRFunctions function name cannot be nil.");
+  }
+  NSString *projectID = _app.options.projectID;
+  if (!projectID) {
+    FUNThrowInvalidArgument(@"FIRFunctions app projectID cannot be nil.");
+  }
+  if (_useLocalhost) {
+    return [NSString stringWithFormat:@"http://localhost:5005/%@/%@/%@", projectID, _region, name];
+  }
+  return
+      [NSString stringWithFormat:@"https://%@-%@.cloudfunctions.net/%@", _region, projectID, name];
+}
+
+- (void)callFunction:(NSString *)name
+          withObject:(nullable id)data
+          completion:(void (^)(FIRHTTPSCallableResult *_Nullable result,
+                               NSError *_Nullable error))completion {
+  [_contextProvider getContext:^(FUNContext *_Nullable context, NSError *_Nullable error) {
+    if (error) {
+      if (completion) {
+        completion(nil, error);
+      }
+      return;
+    }
+    return [self callFunction:name withObject:data context:context completion:completion];
+  }];
+}
+
+- (void)callFunction:(NSString *)name
+          withObject:(nullable id)data
+             context:(FUNContext *)context
+          completion:(void (^)(FIRHTTPSCallableResult *_Nullable result,
+                               NSError *_Nullable error))completion {
+  GTMSessionFetcher *fetcher = [_fetcherService fetcherWithURLString:[self URLWithName:name]];
+
+  NSMutableDictionary *body = [NSMutableDictionary dictionary];
+  // Encode the data in the body.
+  if (!data) {
+    data = [NSNull null];
+  }
+  id encoded = [_serializer encode:data];
+  if (!encoded) {
+    FUNThrowInvalidArgument(@"FIRFunctions data encoded as nil. This should not happen.");
+  }
+  body[@"data"] = encoded;
+
+  NSError *error = nil;
+  NSData *payload = [NSJSONSerialization dataWithJSONObject:body options:0 error:&error];
+  if (error) {
+    if (completion) {
+      dispatch_async(dispatch_get_main_queue(), ^{
+        completion(nil, error);
+      });
+    }
+    return;
+  }
+  fetcher.bodyData = payload;
+
+  // Set the headers.
+  [fetcher setRequestValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
+  if (context.authToken) {
+    NSString *value = [NSString stringWithFormat:@"Bearer %@", context.authToken];
+    [fetcher setRequestValue:value forHTTPHeaderField:@"Authorization"];
+  }
+  if (context.instanceIDToken) {
+    [fetcher setRequestValue:context.instanceIDToken forHTTPHeaderField:kFUNInstanceIDTokenHeader];
+  }
+
+  // Override normal security rules if this is a local test.
+  if (_useLocalhost) {
+    fetcher.allowLocalhostRequest = YES;
+    fetcher.allowedInsecureSchemes = @[ @"http" ];
+  }
+
+  FUNSerializer *serializer = _serializer;
+  [fetcher beginFetchWithCompletionHandler:^(NSData *_Nullable data, NSError *_Nullable error) {
+    // If there was an HTTP error, convert it to our own error domain.
+    if (error) {
+      if ([error.domain isEqualToString:kGTMSessionFetcherStatusDomain]) {
+        error = FUNErrorForResponse(error.code, data, serializer);
+      }
+    } else {
+      // If there wasn't an HTTP error, see if there was an error in the body.
+      error = FUNErrorForResponse(200, data, serializer);
+    }
+    // If there was an error, report it to the user and stop.
+    if (error) {
+      if (completion) {
+        completion(nil, error);
+      }
+      return;
+    }
+
+    id responseJSON = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
+    if (error) {
+      if (completion) {
+        completion(nil, error);
+      }
+      return;
+    }
+    if (![responseJSON isKindOfClass:[NSDictionary class]]) {
+      NSDictionary *userInfo = @{NSLocalizedDescriptionKey : @"Response was not a dictionary."};
+      error = [NSError errorWithDomain:FIRFunctionsErrorDomain
+                                  code:FIRFunctionsErrorCodeInternal
+                              userInfo:userInfo];
+      if (completion) {
+        completion(nil, error);
+      }
+      return;
+    }
+    id dataJSON = responseJSON[@"data"];
+    // TODO(klimt): Allow "result" instead of "data" for now, for backwards compatibility.
+    if (!dataJSON) {
+      dataJSON = responseJSON[@"result"];
+    }
+    if (!dataJSON) {
+      NSDictionary *userInfo =
+          @{NSLocalizedDescriptionKey : @"Response did not include data field."};
+      error = [NSError errorWithDomain:FIRFunctionsErrorDomain
+                                  code:FIRFunctionsErrorCodeInternal
+                              userInfo:userInfo];
+      if (completion) {
+        completion(nil, error);
+      }
+      return;
+    }
+    id resultData = [serializer decode:dataJSON error:&error];
+    if (error) {
+      if (completion) {
+        completion(nil, error);
+      }
+      return;
+    }
+    id result = [[FIRHTTPSCallableResult alloc] initWithData:resultData];
+    if (completion) {
+      // If there's no result field, this will return nil, which is fine.
+      completion(result, nil);
+    }
+  }];
+}
+
+- (FIRHTTPSCallable *)HTTPSCallableWithName:(NSString *)name {
+  return [[FIRHTTPSCallable alloc] initWithFunctions:self name:name];
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FIRHTTPSCallable+Internal.h b/Functions/FirebaseFunctions/FIRHTTPSCallable+Internal.h
new file mode 100644
index 0000000..0a8dae1
--- /dev/null
+++ b/Functions/FirebaseFunctions/FIRHTTPSCallable+Internal.h
@@ -0,0 +1,46 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+#import "FIRHTTPSCallable.h"
+
+@class FIRFunctions;
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FIRHTTPSCallableResult (Internal)
+
+/**
+ * Initializes a callable result.
+ *
+ * @param result The data to wrap.
+ */
+- (instancetype)initWithData:(id)result;
+
+@end
+
+@interface FIRHTTPSCallable (Internal)
+
+/**
+ * Initializes a reference to the given http trigger.
+ *
+ * @param functionsClient The functions client to use for making network requests.
+ * @param name The name of the http trigger.
+ */
+- (instancetype)initWithFunctions:(FIRFunctions *)functionsClient name:(NSString *)name;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FIRHTTPSCallable.m b/Functions/FirebaseFunctions/FIRHTTPSCallable.m
new file mode 100644
index 0000000..2979ca5
--- /dev/null
+++ b/Functions/FirebaseFunctions/FIRHTTPSCallable.m
@@ -0,0 +1,71 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "FIRHTTPSCallable.h"
+#import "FIRHTTPSCallable+Internal.h"
+
+#import "FIRFunctions+Internal.h"
+#import "FUNUsageValidation.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@implementation FIRHTTPSCallableResult
+
+- (instancetype)initWithData:(id)data {
+  self = [super init];
+  if (self) {
+    _data = data;
+  }
+  return self;
+}
+
+@end
+
+@interface FIRHTTPSCallable () {
+  // The functions client to use for making calls.
+  FIRFunctions *_functions;
+  // The name of the http endpoint this reference refers to.
+  NSString *_name;
+}
+
+@end
+
+@implementation FIRHTTPSCallable
+
+- (instancetype)initWithFunctions:(FIRFunctions *)functions name:(NSString *)name {
+  self = [super init];
+  if (self) {
+    if (!name) {
+      FUNThrowInvalidArgument(@"FIRHTTPSCallable name cannot be nil.");
+    }
+    _name = [name copy];
+    _functions = functions;
+  }
+  return self;
+}
+
+- (void)callWithCompletion:(void (^)(FIRHTTPSCallableResult *_Nullable result,
+                                     NSError *_Nullable error))completion {
+  [self callWithObject:nil completion:completion];
+}
+
+- (void)callWithObject:(nullable id)data
+            completion:(void (^)(FIRHTTPSCallableResult *_Nullable result,
+                                 NSError *_Nullable error))completion {
+  [_functions callFunction:_name withObject:data completion:completion];
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FUNContext.h b/Functions/FirebaseFunctions/FUNContext.h
new file mode 100644
index 0000000..5cbc474
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNContext.h
@@ -0,0 +1,44 @@
+//
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+@class FIRApp;
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * FUNContext is a helper class for gathering metadata for a function call.
+ */
+@interface FUNContext : NSObject
+- (id)init NS_UNAVAILABLE;
+@property(nonatomic, copy, nullable, readonly) NSString *authToken;
+@property(nonatomic, copy, nullable, readonly) NSString *instanceIDToken;
+@end
+
+/**
+ * A FUNContextProvider gathers metadata and creats a FUNContext.
+ */
+@interface FUNContextProvider : NSObject
+
+- (id)init NS_UNAVAILABLE;
+
+- (instancetype)initWithApp:(FIRApp *)app NS_DESIGNATED_INITIALIZER;
+
+- (void)getContext:(void (^)(FUNContext *_Nullable context, NSError *_Nullable error))completion;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FUNContext.m b/Functions/FirebaseFunctions/FUNContext.m
new file mode 100644
index 0000000..890b5bf
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNContext.m
@@ -0,0 +1,87 @@
+//
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "FUNContext.h"
+
+#import "FIRApp.h"
+#import "FIRAppInternal.h"
+#import "FUNInstanceIDProxy.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FUNContext ()
+
+- (instancetype)initWithAuthToken:(NSString *_Nullable)authToken
+                  instanceIDToken:(NSString *_Nullable)instanceIDToken NS_DESIGNATED_INITIALIZER;
+
+@end
+
+@implementation FUNContext
+
+- (instancetype)initWithAuthToken:(NSString *_Nullable)authToken
+                  instanceIDToken:(NSString *_Nullable)instanceIDToken {
+  self = [super init];
+  if (self) {
+    _authToken = [authToken copy];
+    _instanceIDToken = [instanceIDToken copy];
+  }
+  return self;
+}
+
+@end
+
+@interface FUNContextProvider () {
+  FIRApp *_app;
+  FUNInstanceIDProxy *_instanceIDProxy;
+}
+@end
+
+@implementation FUNContextProvider
+
+- (instancetype)initWithApp:(FIRApp *)app {
+  self = [super init];
+  if (self) {
+    _app = app;
+    _instanceIDProxy = [[FUNInstanceIDProxy alloc] init];
+  }
+  return self;
+}
+
+// This is broken out so it can be mocked for tests.
+- (NSString *)instanceIDToken {
+  return [_instanceIDProxy token];
+}
+
+- (void)getContext:(void (^)(FUNContext *_Nullable context, NSError *_Nullable error))completion {
+  // Get the auth token.
+  [_app getTokenForcingRefresh:NO
+                  withCallback:^(NSString *_Nullable token, NSError *_Nullable error) {
+                    if (error) {
+                      completion(nil, error);
+                      return;
+                    }
+
+                    // Get the instance id token.
+                    NSString *_Nullable instanceIDToken = [self instanceIDToken];
+
+                    FUNContext *context = [[FUNContext alloc] initWithAuthToken:token
+                                                                instanceIDToken:instanceIDToken];
+                    completion(context, nil);
+                  }];
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FUNError.h b/Functions/FirebaseFunctions/FUNError.h
new file mode 100644
index 0000000..d66a814
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNError.h
@@ -0,0 +1,34 @@
+//
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+@class FUNSerializer;
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * Takes an HTTP status code and optional body and returns a corresponding NSError.
+ * If an explicit error is encoded in the JSON body, it will be used.
+ * Otherwise, uses the standard HTTP status code -> error mapping defined in:
+ * https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto
+ * @param status An HTTP status code.
+ * @param body Optional body of the HTTP response.
+ * @param serializer A serializer to use to decode the details in the error response.
+ * @return The corresponding error.
+ */
+NSError *FUNErrorForResponse(NSInteger status, NSData *_Nullable body, FUNSerializer *serializer);
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FUNError.m b/Functions/FirebaseFunctions/FUNError.m
new file mode 100644
index 0000000..abe0287
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNError.m
@@ -0,0 +1,189 @@
+//
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "FUNError.h"
+#import "FIRError.h"
+
+#import "FUNSerializer.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+NSString *const FIRFunctionsErrorDomain = @"com.firebase.functions";
+NSString *const FIRFunctionsErrorDetailsKey = @"details";
+
+/**
+ * Takes an HTTP status code and returns the corresponding FIRFunctionsErrorCode error code.
+ * This is the standard HTTP status code -> error mapping defined in:
+ * https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto
+ * @param status An HTTP status code.
+ * @return The corresponding error code, or FIRFunctionsErrorCodeUnknown if none.
+ */
+FIRFunctionsErrorCode FIRFunctionsErrorCodeForHTTPStatus(NSInteger status) {
+  switch (status) {
+    case 200:
+      return FIRFunctionsErrorCodeOK;
+    case 400:
+      return FIRFunctionsErrorCodeInvalidArgument;
+    case 401:
+      return FIRFunctionsErrorCodeUnauthenticated;
+    case 403:
+      return FIRFunctionsErrorCodePermissionDenied;
+    case 404:
+      return FIRFunctionsErrorCodeNotFound;
+    case 409:
+      return FIRFunctionsErrorCodeAborted;
+    case 429:
+      return FIRFunctionsErrorCodeResourceExhausted;
+    case 499:
+      return FIRFunctionsErrorCodeCancelled;
+    case 500:
+      return FIRFunctionsErrorCodeInternal;
+    case 501:
+      return FIRFunctionsErrorCodeUnimplemented;
+    case 503:
+      return FIRFunctionsErrorCodeUnavailable;
+    case 504:
+      return FIRFunctionsErrorCodeDeadlineExceeded;
+  }
+  return FIRFunctionsErrorCodeInternal;
+}
+
+/**
+ * Takes the name of an error code and returns the enum value for it.
+ * @param name An error name.
+ * @return The error code with this name, or FIRFunctionsErrorCodeUnknown if none.
+ */
+FIRFunctionsErrorCode FIRFunctionsErrorCodeForName(NSString *name) {
+  static NSDictionary<NSString *, NSNumber *> *errors;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    errors = @{
+      @"OK" : @(FIRFunctionsErrorCodeOK),
+      @"CANCELLED" : @(FIRFunctionsErrorCodeCancelled),
+      @"UNKNOWN" : @(FIRFunctionsErrorCodeUnknown),
+      @"INVALID_ARGUMENT" : @(FIRFunctionsErrorCodeInvalidArgument),
+      @"DEADLINE_EXCEEDED" : @(FIRFunctionsErrorCodeDeadlineExceeded),
+      @"NOT_FOUND" : @(FIRFunctionsErrorCodeNotFound),
+      @"ALREADY_EXISTS" : @(FIRFunctionsErrorCodeAlreadyExists),
+      @"PERMISSION_DENIED" : @(FIRFunctionsErrorCodePermissionDenied),
+      @"RESOURCE_EXHAUSTED" : @(FIRFunctionsErrorCodeResourceExhausted),
+      @"FAILED_PRECONDITION" : @(FIRFunctionsErrorCodeFailedPrecondition),
+      @"ABORTED" : @(FIRFunctionsErrorCodeAborted),
+      @"OUT_OF_RANGE" : @(FIRFunctionsErrorCodeOutOfRange),
+      @"UNIMPLEMENTED" : @(FIRFunctionsErrorCodeUnimplemented),
+      @"INTERNAL" : @(FIRFunctionsErrorCodeInternal),
+      @"UNAVAILABLE" : @(FIRFunctionsErrorCodeUnavailable),
+      @"DATA_LOSS" : @(FIRFunctionsErrorCodeDataLoss),
+      @"UNAUTHENTICATED" : @(FIRFunctionsErrorCodeUnauthenticated),
+    };
+  });
+  NSNumber *code = errors[name];
+  if (code) {
+    return code.intValue;
+  }
+  return FIRFunctionsErrorCodeInternal;
+}
+
+/**
+ * Takes a FIRFunctionsErrorCode and returns an English description of it.
+ * @param code An error code.
+ * @return A description of the code, or "UNKNOWN" if none.
+ */
+NSString *FUNDescriptionForErrorCode(FIRFunctionsErrorCode code) {
+  switch (code) {
+    case FIRFunctionsErrorCodeOK:
+      return @"OK";
+    case FIRFunctionsErrorCodeCancelled:
+      return @"CANCELLED";
+    case FIRFunctionsErrorCodeUnknown:
+      return @"UNKNOWN";
+    case FIRFunctionsErrorCodeInvalidArgument:
+      return @"INVALID ARGUMENT";
+    case FIRFunctionsErrorCodeDeadlineExceeded:
+      return @"DEADLINE EXCEEDED";
+    case FIRFunctionsErrorCodeNotFound:
+      return @"NOT FOUND";
+    case FIRFunctionsErrorCodeAlreadyExists:
+      return @"ALREADY EXISTS";
+    case FIRFunctionsErrorCodePermissionDenied:
+      return @"PERMISSION DENIED";
+    case FIRFunctionsErrorCodeResourceExhausted:
+      return @"RESOURCE EXHAUSTED";
+    case FIRFunctionsErrorCodeFailedPrecondition:
+      return @"FAILED PRECONDITION";
+    case FIRFunctionsErrorCodeAborted:
+      return @"ABORTED";
+    case FIRFunctionsErrorCodeOutOfRange:
+      return @"OUT OF RANGE";
+    case FIRFunctionsErrorCodeUnimplemented:
+      return @"UNIMPLEMENTED";
+    case FIRFunctionsErrorCodeInternal:
+      return @"INTERNAL";
+    case FIRFunctionsErrorCodeUnavailable:
+      return @"UNAVAILABLE";
+    case FIRFunctionsErrorCodeDataLoss:
+      return @"DATA LOSS";
+    case FIRFunctionsErrorCodeUnauthenticated:
+      return @"UNAUTHENTICATED";
+  }
+  return @"UNKNOWN";
+}
+
+NSError *FUNErrorForResponse(NSInteger status, NSData *_Nullable body, FUNSerializer *serializer) {
+  // Start with reasonable defaults from the status code.
+  FIRFunctionsErrorCode code = FIRFunctionsErrorCodeForHTTPStatus(status);
+  NSString *description = FUNDescriptionForErrorCode(code);
+  id details = nil;
+
+  // Then look through the body for explicit details.
+  if (body) {
+    NSError *parseError = nil;
+    id json = [NSJSONSerialization JSONObjectWithData:body options:0 error:&parseError];
+    if (!parseError && [json isKindOfClass:[NSDictionary class]]) {
+      id errorDetails = json[@"error"];
+      if ([errorDetails isKindOfClass:[NSDictionary class]]) {
+        if ([errorDetails[@"status"] isKindOfClass:[NSString class]]) {
+          code = FIRFunctionsErrorCodeForName(errorDetails[@"status"]);
+          // The default description needs to be updated for the new code.
+          description = FUNDescriptionForErrorCode(code);
+        }
+        if ([errorDetails[@"message"] isKindOfClass:[NSString class]]) {
+          description = (NSString *)errorDetails[@"message"];
+        }
+        details = errorDetails[@"details"];
+        if (details) {
+          NSError *decodeError = nil;
+          details = [serializer decode:details error:&decodeError];
+          // Just ignore the details if there an error decoding them.
+        }
+      }
+    }
+  }
+
+  if (code == FIRFunctionsErrorCodeOK) {
+    // Technically, there's an edge case where a developer could explicitly return an error code of
+    // OK, and we will treat it as success, but that seems reasonable.
+    return nil;
+  }
+
+  NSMutableDictionary *userInfo = [NSMutableDictionary dictionary];
+  userInfo[NSLocalizedDescriptionKey] = description;
+  if (details) {
+    userInfo[FIRFunctionsErrorDetailsKey] = details;
+  }
+  return [NSError errorWithDomain:FIRFunctionsErrorDomain code:code userInfo:userInfo];
+}
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FUNInstanceIDProxy.h b/Functions/FirebaseFunctions/FUNInstanceIDProxy.h
new file mode 100644
index 0000000..17ec9ef
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNInstanceIDProxy.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Note: This file is forked from FIRMessagingInstanceIDProxy.h
+
+#import <Foundation/Foundation.h>
+
+/**
+ *  FirebaseFunctions cannot always depend on FIRInstanceID directly, due to how it is
+ *  packaged. To make it easier to make calls to FIRInstanceID, this proxy class, will provide
+ *  method names duplicated from FIRInstanceID, while using reflection-based called to proxy
+ *  the requests.
+ */
+@interface FUNInstanceIDProxy : NSObject
+- (nullable NSString *)token;
+@end
diff --git a/Functions/FirebaseFunctions/FUNInstanceIDProxy.m b/Functions/FirebaseFunctions/FUNInstanceIDProxy.m
new file mode 100644
index 0000000..f89ec98
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNInstanceIDProxy.m
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Note: This is forked from FIRMessagingInstanceIDProxy.m
+
+#import "FUNInstanceIDProxy.h"
+
+@implementation FUNInstanceIDProxy
+
++ (nonnull instancetype)instanceIDProxy {
+  static id proxyInstanceID = nil;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    Class instanceIDClass = NSClassFromString(@"FIRInstanceID");
+    if (!instanceIDClass) {
+      proxyInstanceID = nil;
+      return;
+    }
+    SEL instanceIDSelector = NSSelectorFromString(@"instanceID");
+    if (![instanceIDClass respondsToSelector:instanceIDSelector]) {
+      proxyInstanceID = nil;
+      return;
+    }
+    IMP instanceIDImp = [instanceIDClass methodForSelector:instanceIDSelector];
+    id (*instanceIDFunc)(id, SEL) = (void *)instanceIDImp;
+    proxyInstanceID = instanceIDFunc(instanceIDClass, instanceIDSelector);
+  });
+  return (FUNInstanceIDProxy *)proxyInstanceID;
+}
+
+#pragma mark - Tokens
+
+- (nullable NSString *)token {
+  id proxy = [[self class] instanceIDProxy];
+  SEL getTokenSelector = NSSelectorFromString(@"token");
+  if (![proxy respondsToSelector:getTokenSelector]) {
+    return nil;
+  }
+  IMP getTokenIMP = [proxy methodForSelector:getTokenSelector];
+  NSString *(*getToken)(id, SEL) = (void *)getTokenIMP;
+  return getToken(proxy, getTokenSelector);
+}
+
+@end
diff --git a/Functions/FirebaseFunctions/FUNSerializer.h b/Functions/FirebaseFunctions/FUNSerializer.h
new file mode 100644
index 0000000..598a2a1
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNSerializer.h
@@ -0,0 +1,33 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FUNSerializer : NSObject
+
+/**
+ * Converts raw Objective-C types into JSON objects.
+ */
+- (id)encode:(id)object;
+
+/**
+ * Converts objects in JSON to Objective-C types.
+ */
+- (id)decode:(id)object error:(NSError **)error;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FUNSerializer.m b/Functions/FirebaseFunctions/FUNSerializer.m
new file mode 100644
index 0000000..682f981
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNSerializer.m
@@ -0,0 +1,231 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "FUNSerializer.h"
+
+#import "FIRError.h"
+#import "FUNUsageValidation.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+static NSString *const kLongType = @"type.googleapis.com/google.protobuf.Int64Value";
+static NSString *const kUnsignedLongType = @"type.googleapis.com/google.protobuf.UInt64Value";
+static NSString *const kDateType = @"type.googleapis.com/google.protobuf.Timestamp";
+
+@interface FUNSerializer () {
+  NSDateFormatter *_dateFormatter;
+}
+@end
+
+@implementation FUNSerializer
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    _dateFormatter = [[NSDateFormatter alloc] init];
+    _dateFormatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
+    _dateFormatter.timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
+  }
+  return self;
+}
+
+- (id)encodeNumber:(NSNumber *)number {
+  // Recover the underlying type of the number, using the method described here:
+  // http://stackoverflow.com/questions/2518761/get-type-of-nsnumber
+  const char *cType = [number objCType];
+
+  // Type Encoding values taken from
+  // https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/
+  // Articles/ocrtTypeEncodings.html
+  switch (cType[0]) {
+    case 'q':
+      // "long long" might be larger than JS supports, so make it a string.
+      return @{
+        @"@type" : kLongType,
+        @"value" : [NSString stringWithFormat:@"%@", number],
+      };
+    case 'Q':
+      // "unsigned long long" might be larger than JS supports, so make it a string.
+      return @{
+        @"@type" : kUnsignedLongType,
+        @"value" : [NSString stringWithFormat:@"%@", number],
+      };
+
+    case 'i':
+    case 's':
+    case 'l':
+    case 'I':
+    case 'S':
+      // If it's an integer that isn't too long, so just use the number.
+      return number;
+
+    case 'f':
+    case 'd':
+      // It's a float/double that's not too large.
+      return number;
+
+    case 'B':
+    case 'c':
+    case 'C':
+      // Boolean values are weird.
+      //
+      // On arm64, objCType of a BOOL-valued NSNumber will be "c", even though @encode(BOOL)
+      // returns "B". "c" is the same as @encode(signed char). Unfortunately this means that
+      // legitimate usage of signed chars is impossible, but this should be rare.
+      //
+      // Just return Boolean values as-is.
+      return number;
+
+    default:
+      // All documented codes should be handled above, so this shouldn't happen.
+      FUNThrowInvalidArgument(@"Unknown NSNumber objCType %s on %@", cType, number);
+  }
+}
+
+- (id)encode:(id)object {
+  if ([object isEqual:[NSNull null]]) {
+    return object;
+  }
+  if ([object isKindOfClass:[NSNumber class]]) {
+    return [self encodeNumber:object];
+  }
+  if ([object isKindOfClass:[NSString class]]) {
+    return object;
+  }
+  if ([object isKindOfClass:[NSDictionary class]]) {
+    NSMutableDictionary *encoded = [NSMutableDictionary dictionary];
+    [object
+        enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL *_Nonnull stop) {
+          encoded[key] = [self encode:obj];
+        }];
+    return encoded;
+  }
+  if ([object isKindOfClass:[NSArray class]]) {
+    NSMutableArray *encoded = [NSMutableArray arrayWithCapacity:[object count]];
+    for (id obj in object) {
+      [encoded addObject:[self encode:obj]];
+    }
+    return encoded;
+  }
+  // TODO(klimt): Add this back when we support NSDate.
+  /*
+  if ([object isKindOfClass:[NSDate class]]) {
+    NSString *iso8601 = [_dateFormatter stringFromDate:object];
+    return @{
+      @"@type" : kDateType,
+      @"value" : iso8601,
+    };
+  }
+  */
+  FUNThrowInvalidArgument(@"Unsupported type: %@ for value %@", NSStringFromClass([object class]),
+                          object);
+}
+
+NSError *FUNInvalidNumberError(id value, id wrapped) {
+  NSString *description = [NSString stringWithFormat:@"Invalid number: %@ for %@", value, wrapped];
+  NSDictionary *userInfo = @{
+    NSLocalizedDescriptionKey : description,
+  };
+  return [NSError errorWithDomain:FIRFunctionsErrorDomain
+                             code:FIRFunctionsErrorCodeInternal
+                         userInfo:userInfo];
+}
+
+- (id)decodeWrappedType:(NSDictionary *)wrapped error:(NSError **)error {
+  NSAssert(error, @"error must not be nil");
+  NSString *type = wrapped[@"@type"];
+  NSString *value = wrapped[@"value"];
+  if (!value) {
+    return nil;
+  }
+  if ([type isEqualToString:kLongType]) {
+    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
+    NSNumber *n = [formatter numberFromString:value];
+    if (!n) {
+      *error = FUNInvalidNumberError(value, wrapped);
+      return nil;
+    }
+    return n;
+  } else if ([type isEqualToString:kUnsignedLongType]) {
+    // NSNumber formatter doesn't handle unsigned long long, so we have to parse it.
+    const char *str = value.UTF8String;
+    char *end = NULL;
+    unsigned long long n = strtoull(str, &end, 10);
+    if (errno == ERANGE) {
+      // This number was actually too big for an unsigned long long.
+      *error = FUNInvalidNumberError(value, wrapped);
+      return nil;
+    }
+    if (*end) {
+      // The whole string wasn't parsed.
+      *error = FUNInvalidNumberError(value, wrapped);
+      return nil;
+    }
+    return @(n);
+  }
+  return nil;
+}
+
+- (id)decode:(id)object error:(NSError **)error {
+  NSAssert(error, @"error must not be nil");
+  if ([object isKindOfClass:[NSDictionary class]]) {
+    if (object[@"@type"]) {
+      id result = [self decodeWrappedType:object error:error];
+      if (*error) {
+        return nil;
+      }
+      if (result) {
+        return result;
+      }
+      // Treat unknown types as dictionaries, so we don't crash old clients when we add types.
+    }
+    NSMutableDictionary *decoded = [NSMutableDictionary dictionary];
+    __block NSError *decodeError = nil;
+    [object
+        enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL *_Nonnull stop) {
+          id decodedItem = [self decode:obj error:&decodeError];
+          if (decodeError) {
+            *stop = YES;
+            return;
+          }
+          decoded[key] = decodedItem;
+        }];
+    if (decodeError) {
+      *error = decodeError;
+      return nil;
+    }
+    return decoded;
+  }
+  if ([object isKindOfClass:[NSArray class]]) {
+    NSMutableArray *result = [NSMutableArray arrayWithCapacity:[object count]];
+    for (id obj in object) {
+      id decoded = [self decode:obj error:error];
+      if (*error) {
+        return nil;
+      }
+      [result addObject:decoded];
+    }
+    return result;
+  }
+  if ([object isKindOfClass:[NSNumber class]] || [object isKindOfClass:[NSString class]] ||
+      [object isEqual:[NSNull null]]) {
+    return object;
+  }
+  FUNThrowInvalidArgument(@"Unsupported type: %@ for value %@", NSStringFromClass([object class]),
+                          object);
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FUNUsageValidation.h b/Functions/FirebaseFunctions/FUNUsageValidation.h
new file mode 100644
index 0000000..17b1c4f
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNUsageValidation.h
@@ -0,0 +1,38 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/** Helper for creating a general exception for invalid usage of an API. */
+NSException *FUNInvalidUsage(NSString *exceptionName, NSString *format, ...);
+
+/**
+ * Macro to throw exceptions in response to API usage errors. Avoids the lint warning you usually
+ * get when using @throw and (unlike a function) doesn't trigger warnings about not all codepaths
+ * returning a value.
+ *
+ * Exceptions should only be used for programmer errors made by consumers of the SDK, e.g.
+ * invalid method arguments.
+ *
+ * For recoverable runtime errors, use NSError**.
+ * For internal programming errors, use FSTFail().
+ */
+#define FUNThrowInvalidArgument(format, ...)                                       \
+  do {                                                                             \
+    @throw FUNInvalidUsage(@"FIRInvalidArgumentException", format, ##__VA_ARGS__); \
+  } while (0)
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/FUNUsageValidation.m b/Functions/FirebaseFunctions/FUNUsageValidation.m
new file mode 100644
index 0000000..a50f525
--- /dev/null
+++ b/Functions/FirebaseFunctions/FUNUsageValidation.m
@@ -0,0 +1,28 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "FUNUsageValidation.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+NSException *FUNInvalidUsage(NSString *exceptionName, NSString *format, ...) {
+  va_list arg_list;
+  va_start(arg_list, format);
+  NSString *formattedString = [[NSString alloc] initWithFormat:format arguments:arg_list];
+  va_end(arg_list);
+
+  return [[NSException alloc] initWithName:exceptionName reason:formattedString userInfo:nil];
+}
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/Public/FIRError.h b/Functions/FirebaseFunctions/Public/FIRError.h
new file mode 100644
index 0000000..3048dee
--- /dev/null
+++ b/Functions/FirebaseFunctions/Public/FIRError.h
@@ -0,0 +1,91 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+// The error domain for codes in the FIRFunctionsErrorCode enum.
+FOUNDATION_EXPORT NSString *const FIRFunctionsErrorDomain NS_SWIFT_NAME(FunctionsErrorDomain);
+
+// The key for finding error details in the NSError userInfo.
+FOUNDATION_EXPORT NSString *const FIRFunctionsErrorDetailsKey
+    NS_SWIFT_NAME(FunctionsErrorDetailsKey);
+
+/**
+ * The set of error status codes that can be returned from a Callable HTTPS tigger. These are the
+ * canonical error codes for Google APIs, as documented here:
+ * https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto#L26
+ */
+typedef NS_ENUM(NSInteger, FIRFunctionsErrorCode) {
+  /** The operation completed successfully. */
+  FIRFunctionsErrorCodeOK = 0,
+  /** The operation was cancelled (typically by the caller). */
+  FIRFunctionsErrorCodeCancelled = 1,
+  /** Unknown error or an error from a different error domain. */
+  FIRFunctionsErrorCodeUnknown = 2,
+  /**
+   * Client specified an invalid argument. Note that this differs from `FailedPrecondition`.
+   * `InvalidArgument` indicates arguments that are problematic regardless of the state of the
+   * system (e.g., an invalid field name).
+   */
+  FIRFunctionsErrorCodeInvalidArgument = 3,
+  /**
+   * Deadline expired before operation could complete. For operations that change the state of the
+   * system, this error may be returned even if the operation has completed successfully. For
+   * example, a successful response from a server could have been delayed long enough for the
+   * deadline to expire.
+   */
+  FIRFunctionsErrorCodeDeadlineExceeded = 4,
+  /** Some requested document was not found. */
+  FIRFunctionsErrorCodeNotFound = 5,
+  /** Some document that we attempted to create already exists. */
+  FIRFunctionsErrorCodeAlreadyExists = 6,
+  /** The caller does not have permission to execute the specified operation. */
+  FIRFunctionsErrorCodePermissionDenied = 7,
+  /**
+   * Some resource has been exhausted, perhaps a per-user quota, or perhaps the entire file system
+   * is out of space.
+   */
+  FIRFunctionsErrorCodeResourceExhausted = 8,
+  /**
+   * Operation was rejected because the system is not in a state required for the operation's
+   * execution.
+   */
+  FIRFunctionsErrorCodeFailedPrecondition = 9,
+  /**
+   * The operation was aborted, typically due to a concurrency issue like transaction aborts, etc.
+   */
+  FIRFunctionsErrorCodeAborted = 10,
+  /** Operation was attempted past the valid range. */
+  FIRFunctionsErrorCodeOutOfRange = 11,
+  /** Operation is not implemented or not supported/enabled. */
+  FIRFunctionsErrorCodeUnimplemented = 12,
+  /**
+   * Internal errors. Means some invariant expected by underlying system has been broken. If you
+   * see one of these errors, something is very broken.
+   */
+  FIRFunctionsErrorCodeInternal = 13,
+  /**
+   * The service is currently unavailable. This is a most likely a transient condition and may be
+   * corrected by retrying with a backoff.
+   */
+  FIRFunctionsErrorCodeUnavailable = 14,
+  /** Unrecoverable data loss or corruption. */
+  FIRFunctionsErrorCodeDataLoss = 15,
+  /** The request does not have valid authentication credentials for the operation. */
+  FIRFunctionsErrorCodeUnauthenticated = 16,
+};
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/Public/FIRFunctions.h b/Functions/FirebaseFunctions/Public/FIRFunctions.h
new file mode 100644
index 0000000..d01175c
--- /dev/null
+++ b/Functions/FirebaseFunctions/Public/FIRFunctions.h
@@ -0,0 +1,66 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class FIRApp;
+@class FIRHTTPSCallable;
+
+/**
+ * `FIRFunctions` is the client for Cloud Functions for a Firebase project.
+ */
+NS_SWIFT_NAME(Functions)
+@interface FIRFunctions : NSObject
+
+- (id)init NS_UNAVAILABLE;
+
+/**
+ * Creates a Cloud Functions client with the default app.
+ */
++ (instancetype)functions NS_SWIFT_NAME(functions());
+
+/**
+ * Creates a Cloud Functions client with the given app.
+ * @param app The app for the Firebase project.
+ */
++ (instancetype)functionsForApp:(FIRApp *)app NS_SWIFT_NAME(functions(app:));
+
+/**
+ * Creates a Cloud Functions client with the default app and given region.
+ * @param region The region for the http trigger, such as "us-central1".
+ */
+// + (instancetype)functionsForRegion:(NSString *)region NS_SWIFT_NAME(functions(region:));
+
+/**
+ * Creates a Cloud Functions client with the given app and region.
+ * @param app The app for the Firebase project.
+ * @param region The region for the http trigger, such as "us-central1".
+ */
+// clang-format off
+// because it incorrectly breaks this NS_SWIFT_NAME.
+// + (instancetype)functionsForApp:(FIRApp *)app
+//                         region:(NSString *)region NS_SWIFT_NAME(functions(app:region:));
+// clang-format on
+
+/**
+ * Creates a reference to the Callable HTTPS trigger with the given name.
+ * @param name The name of the Callable HTTPS trigger.
+ */
+- (FIRHTTPSCallable *)HTTPSCallableWithName:(NSString *)name NS_SWIFT_NAME(httpsCallable(_:));
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/FirebaseFunctions/Public/FIRHTTPSCallable.h b/Functions/FirebaseFunctions/Public/FIRHTTPSCallable.h
new file mode 100644
index 0000000..9298dda
--- /dev/null
+++ b/Functions/FirebaseFunctions/Public/FIRHTTPSCallable.h
@@ -0,0 +1,93 @@
+// Copyright 2017 Google
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * A `FIRHTTPSCallableResult` contains the result of calling a `FIRHTTPSCallable`.
+ */
+NS_SWIFT_NAME(HTTPSCallableResult)
+@interface FIRHTTPSCallableResult : NSObject
+
+- (id)init NS_UNAVAILABLE;
+
+/**
+ * The data that was returned from the Callable HTTPS trigger.
+ *
+ * The data is in the form of native objects. For example, if your trigger returned an
+ * array, this object would be an NSArray. If your trigger returned a JavaScript object with
+ * keys and values, this object would be an NSDictionary.
+ */
+@property(nonatomic, strong, readonly) id data;
+
+@end
+
+/**
+ * A `FIRHTTPSCallable` is reference to a particular Callable HTTPS trigger in Cloud Functions.
+ */
+NS_SWIFT_NAME(HTTPSCallable)
+@interface FIRHTTPSCallable : NSObject
+
+- (id)init NS_UNAVAILABLE;
+
+/**
+ * Executes this Callable HTTPS trigger asynchronously without any parameters.
+ *
+ * The request to the Cloud Functions backend made by this method automatically includes a
+ * Firebase Instance ID token to identify the app instance. If a user is logged in with Firebase
+ * Auth, an auth ID token for the user is also automatically included.
+ *
+ * Firebase Instance ID sends data to the Firebase backend periodically to collect information
+ * regarding the app instance. To stop this, see `[FIRInstanceID deleteIDWithHandler:]`. It
+ * resumes with a new Instance ID the next time you call this method.
+ *
+ * @param completion The block to call when the HTTPS request has completed.
+ */
+- (void)callWithCompletion:
+    (void (^)(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error))completion
+    NS_SWIFT_NAME(call(completion:));
+
+/**
+ * Executes this Callable HTTPS trigger asynchronously.
+ *
+ * The data passed into the trigger can be any of the following types:
+ * * NSNull
+ * * NSString
+ * * NSNumber
+ * * NSArray<id>, where the contained objects are also one of these types.
+ * * NSDictionary<NSString, id>, where the values are also one of these types.
+ *
+ * The request to the Cloud Functions backend made by this method automatically includes a
+ * Firebase Instance ID token to identify the app instance. If a user is logged in with Firebase
+ * Auth, an auth ID token for the user is also automatically included.
+ *
+ * Firebase Instance ID sends data to the Firebase backend periodically to collect information
+ * regarding the app instance. To stop this, see `[FIRInstanceID deleteIDWithHandler:]`. It
+ * resumes with a new Instance ID the next time you call this method.
+ *
+ * @param data Parameters to pass to the trigger.
+ * @param completion The block to call when the HTTPS request has completed.
+ */
+// clang-format off
+// because it incorrectly breaks this NS_SWIFT_NAME.
+- (void)callWithObject:(nullable id)data
+            completion:(void (^)(FIRHTTPSCallableResult *_Nullable result, NSError *_Nullable error))completion
+    NS_SWIFT_NAME(call(_:completion:));
+// clang-format on
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Functions/README.md b/Functions/README.md
new file mode 100644
index 0000000..f0b8d62
--- /dev/null
+++ b/Functions/README.md
@@ -0,0 +1,21 @@
+# Cloud Functions for Firebase iOS SDK
+
+## To run unit tests
+
+Choose the FirebaseFunctions_Tests scheme and press Command-u.
+
+## To run integration tests
+
+Before running the integration tests, you'll need to start a backend emulator
+for them to talk to.
+
+1.  Make sure you have `npm` installed.
+2.  Run the backend startup script: `Backend/start.sh`
+    It will use `npm install` to automatically download the libraries it needs
+    to run the [Cloud Functions Local Emulator](https://cloud.google.com/functions/docs/emulator).
+    The first time you run it, it will ask for a projectId.
+    You can put anything you like. It will be ignored.
+3.  Create the workspace in Functions/Example with `pod install`.
+4.  `open FirebaseFunctions.xcworkspace`
+5.  Choose the FirebaseFunctions_IntegrationTests scheme and press Command-u.
+6.  When you are finished, you can press any key to stop the backend.
diff --git a/README.md b/README.md
index 2d44c9a..c54cdec 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 This repository contains a subset of the Firebase iOS SDK source. It currently
 includes FirebaseCore, FirebaseAuth, FirebaseDatabase, FirebaseFirestore,
-FirebaseMessaging and FirebaseStorage.
+FirebaseFunctions, FirebaseMessaging and FirebaseStorage.
 
 Firebase is an app development platform with tools to help you build, grow and
 monetize your app. More information about Firebase can be found at
@@ -15,9 +15,10 @@ the Firebase iOS SDK. If you're interested in using the Firebase iOS SDK, start
 ## Context
 
 This repo contains a fully functional development environment for FirebaseCore,
-FirebaseAuth, FirebaseDatabase, FirebaseFirestore, FirebaseMessaging, and
-FirebaseStorage. By following the usage instructions below, they can be
-developed and debugged with unit tests, integration tests, and reference samples.
+FirebaseAuth, FirebaseDatabase, FirebaseFirestore, FirebaseFunctions,
+FirebaseMessaging, and FirebaseStorage. By following the usage instructions
+below, they can be developed and debugged with unit tests, integration tests,
+and reference samples.
 
 ## Source pod integration
 
@@ -70,8 +71,9 @@ $ pod update
 $ open Firebase.xcworkspace
 ```
 
-Firestore has a self contained Xcode project. See
-[Firestore/README.md](Firestore/README.md).
+Firestore and Functions have self contained Xcode projects. See
+[Firestore/README.md](Firestore/README.md) and
+[Functions/README.md](Functions/README.md).
 
 ### Running Unit Tests