Add get Auth domain RPC (#214)

* Add get Auth domain RPC

* Fixes indentation

* Addresses comments

* ran tests on Example/Firebase.xcodeproj

4 files changed, 218 insertions, 3 deletions

diff --git a/Example/Auth/Tests/FIRAuthBackendRPCImplementationTests.m b/Example/Auth/Tests/FIRAuthBackendRPCImplementationTests.m
index cf26546..4a718cd 100644
--- a/Example/Auth/Tests/FIRAuthBackendRPCImplementationTests.m
+++ b/Example/Auth/Tests/FIRAuthBackendRPCImplementationTests.m
@@ -236,6 +236,10 @@ static NSString *const kTestValue = @"TestValue";
   return [NSURL URLWithString:kFakeRequestURL];
 }
 
+- (BOOL)containsPostBody {
+  return YES;
+}
+
 - (FIRAuthRequestConfiguration *)requestConfiguration {
   FIRAuthRequestConfiguration *fakeConfiguration =
       [[FIRAuthRequestConfiguration alloc] initWithAPIKey:kFakeAPIkey];
diff --git a/Example/Auth/Tests/FIRFakeBackendRPCIssuer.m b/Example/Auth/Tests/FIRFakeBackendRPCIssuer.m
index bdc7706..0dbbf23 100644
--- a/Example/Auth/Tests/FIRFakeBackendRPCIssuer.m
+++ b/Example/Auth/Tests/FIRFakeBackendRPCIssuer.m
@@ -34,9 +34,11 @@ static NSString *const kFakeErrorDomain = @"fake domain";
                                    contentType:(NSString *)contentType
                              completionHandler:(FIRAuthBackendRPCIssuerCompletionHandler)handler {
   _requestURL = [URL copy];
-  _requestData = body;
-  NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:body options:0 error:nil];
-  _decodedRequest = JSON;
+  if (body) {
+    _requestData = body;
+    NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:body options:0 error:nil];
+    _decodedRequest = JSON;
+  }
   _contentType = contentType;
   _handler = handler;
 }
diff --git a/Example/Auth/Tests/FIRGetProjectConfigRequestTests.m b/Example/Auth/Tests/FIRGetProjectConfigRequestTests.m
new file mode 100644
index 0000000..4c163e8
--- /dev/null
+++ b/Example/Auth/Tests/FIRGetProjectConfigRequestTests.m
@@ -0,0 +1,73 @@
+/*
+ * 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/XCTest.h>
+
+#import "FIRAuthBackend.h"
+#import "FIRGetProjectConfigRequest.h"
+#import "FIRGetProjectConfigResponse.h"
+#import "FIRFakeBackendRPCIssuer.h"
+
+/** @var kTestAPIKey
+    @brief Fake API key used for testing.
+ */
+static NSString *const kTestAPIKey = @"APIKey";
+
+@interface FIRGetProjectConfigRequestTests : XCTestCase
+@end
+
+@implementation FIRGetProjectConfigRequestTests {
+  /** @var _RPCIssuer
+      @brief This backend RPC issuer is used to fake network responses for each test in the suite.
+          In the @c setUp method we initialize this and set @c FIRAuthBackend's RPC issuer to it.
+   */
+  FIRFakeBackendRPCIssuer *_RPCIssuer;
+}
+
+- (void)setUp {
+  [super setUp];
+  FIRFakeBackendRPCIssuer *RPCIssuer = [[FIRFakeBackendRPCIssuer alloc] init];
+  [FIRAuthBackend setDefaultBackendImplementationWithRPCIssuer:RPCIssuer];
+  _RPCIssuer = RPCIssuer;
+}
+
+- (void)tearDown {
+  _RPCIssuer = nil;
+  [FIRAuthBackend setDefaultBackendImplementationWithRPCIssuer:nil];
+  [super tearDown];
+}
+
+/** @fn testGetProjectConfigRequest
+    @brief Tests get project config request.
+ */
+- (void)testGetProjectConfigRequest {
+  FIRAuthRequestConfiguration *requestConfiguration =
+      [[FIRAuthRequestConfiguration alloc] initWithAPIKey:kTestAPIKey];
+  FIRGetProjectConfigRequest *request =
+      [[FIRGetProjectConfigRequest alloc] initWithRequestConfiguration:requestConfiguration];
+
+  [FIRAuthBackend getProjectConfig:request
+                          callback:^(FIRGetProjectConfigResponse *_Nullable response,
+                                     NSError *_Nullable error) {
+
+
+  }];
+  XCTAssertFalse([request containsPostBody]);
+  // Confirm that the quest has no decoded body as it is get request.
+  XCTAssertNil(_RPCIssuer.decodedRequest);
+}
+
+@end
diff --git a/Example/Auth/Tests/FIRGetProjectConfigResponseTests.m b/Example/Auth/Tests/FIRGetProjectConfigResponseTests.m
new file mode 100644
index 0000000..f8f11ef
--- /dev/null
+++ b/Example/Auth/Tests/FIRGetProjectConfigResponseTests.m
@@ -0,0 +1,136 @@
+/*
+ * 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/XCTest.h>
+
+#import "FIRAuthBackend.h"
+#import "FIRAuthErrors.h"
+#import "FIRAuthInternalErrors.h"
+#import "FIRGetProjectConfigRequest.h"
+#import "FIRGetProjectConfigResponse.h"
+#import "FIRFakeBackendRPCIssuer.h"
+
+/** @var kTestAPIKey
+    @brief Fake API key used for testing.
+ */
+static NSString *const kTestAPIKey = @"APIKey";
+
+/** @var kTestProjectID
+    @brief Fake project ID used for testing.
+ */
+static NSString *const kTestProjectID = @"21141651616";
+
+/** @var kTestDomain1
+    @brief Fake whitelisted domain used for testing.
+ */
+static NSString *const kTestDomain1 = @"localhost";
+
+/** @var kTestDomain2
+    @brief Fake whitelisted domain used for testing.
+ */
+static NSString *const kTestDomain2 = @"example.firebaseapp.com";
+
+/** @var kMissingAPIKeyErrorMessage
+    @brief The error message the server would respond with if the API Key was missing.
+ */
+static NSString *const kMissingAPIKeyErrorMessage = @"MISSING_API_KEY";
+
+@interface FIRGetProjectConfigResponseTests : XCTestCase
+@end
+
+@implementation FIRGetProjectConfigResponseTests {
+  /** @var _RPCIssuer
+      @brief This backend RPC issuer is used to fake network responses for each test in the suite.
+          In the @c setUp method we initialize this and set @c FIRAuthBackend's RPC issuer to it.
+   */
+  FIRFakeBackendRPCIssuer *_RPCIssuer;
+}
+
+- (void)setUp {
+  [super setUp];
+  FIRFakeBackendRPCIssuer *RPCIssuer = [[FIRFakeBackendRPCIssuer alloc] init];
+  [FIRAuthBackend setDefaultBackendImplementationWithRPCIssuer:RPCIssuer];
+  _RPCIssuer = RPCIssuer;
+}
+
+- (void)tearDown {
+  _RPCIssuer = nil;
+  [FIRAuthBackend setDefaultBackendImplementationWithRPCIssuer:nil];
+  [super tearDown];
+}
+
+/** @fn testMissingAPIKeyError
+    @brief This test simulates a missing API key error. Since the API key is provided to the backend
+        from the auth library this error should map to an internal error.
+ */
+- (void)testMissingAPIKeyError {
+  FIRAuthRequestConfiguration *requestConfiguration =
+      [[FIRAuthRequestConfiguration alloc] initWithAPIKey:kTestAPIKey];
+  FIRGetProjectConfigRequest *request =
+      [[FIRGetProjectConfigRequest alloc] initWithRequestConfiguration:requestConfiguration];
+
+  __block BOOL callbackInvoked;
+  __block FIRGetProjectConfigResponse *RPCResponse;
+  __block NSError *RPCError;
+  [FIRAuthBackend getProjectConfig:request
+                          callback:^(FIRGetProjectConfigResponse *_Nullable response,
+                                     NSError *_Nullable error) {
+    callbackInvoked = YES;
+    RPCResponse = response;
+    RPCError = error;
+  }];
+
+  [_RPCIssuer respondWithServerErrorMessage:kMissingAPIKeyErrorMessage];
+
+  XCTAssert(callbackInvoked);
+  XCTAssertNotNil(RPCError);
+  XCTAssertEqualObjects(RPCError.domain, FIRAuthErrorDomain);
+  XCTAssertEqual(RPCError.code, FIRAuthErrorCodeInternalError);
+  XCTAssertNotNil(RPCError.userInfo[NSUnderlyingErrorKey]);
+}
+
+/** @fn testSuccessFulGetProjectConfigRequest
+    @brief This test simulates a successful @c getProjectConfig Flow.
+ */
+- (void)testSuccessFulGetProjectConfigRequest {
+  FIRAuthRequestConfiguration *requestConfiguration =
+      [[FIRAuthRequestConfiguration alloc] initWithAPIKey:kTestAPIKey];
+  FIRGetProjectConfigRequest *request =
+      [[FIRGetProjectConfigRequest alloc] initWithRequestConfiguration:requestConfiguration];
+
+  __block BOOL callbackInvoked;
+  __block FIRGetProjectConfigResponse *RPCResponse;
+  __block NSError *RPCError;
+  [FIRAuthBackend getProjectConfig:request
+                          callback:^(FIRGetProjectConfigResponse *_Nullable response,
+                                     NSError *_Nullable error) {
+    callbackInvoked = YES;
+    RPCResponse = response;
+    RPCError = error;
+  }];
+
+  [_RPCIssuer respondWithJSON:@{
+    @"projectId": kTestProjectID,
+    @"authorizedDomains": @[ kTestDomain1, kTestDomain2 ]
+  }];
+  XCTAssert(callbackInvoked);
+  XCTAssertNil(RPCError);
+  XCTAssertEqualObjects(kTestProjectID, RPCResponse.projectID);
+  XCTAssertEqualObjects(kTestDomain1, RPCResponse.authorizedDomains[0]);
+  XCTAssertEqualObjects(kTestDomain2, RPCResponse.authorizedDomains[1]);
+}
+
+@end