port Firestore Auth module in C++ (#733)

* Implement firestore/auth/user

* add user to project and some fixes

* implement firestore/auth/{credentials_provider,empty_credentials_provider}

* implement firestore/auth/firebase_credentials_provider

* refactoring firebase_credentials_provider and add (disabled but working) unit test

* add auth test to project

* address changes

* small fix to style and project

* fix the firebase_credentials_provider_test

* fix style

* address changes

* revert the change to static mutex_

* remove my custom plist path

* fix style

* address changes

* refactoring FirebaseCredentialsProvider to fix the issue w.r.t. auth global dispatch queue

* add /*force_refresh=*/ tag to bool literal for style purpose

* Use a shared_ptr/weak_ptr handoff on FirebaseCredentialsProvider (#778)

* Revert "refactoring FirebaseCredentialsProvider to fix the issue w.r.t. auth global dispatch queue"

This reverts commit 87175a4146267d403a774f138b85f8d3b532fa4b.

* Use a shared_ptr/weak_ptr handoff on FirebaseCredentialsProvider

This avoids any problems with callsbacks retaining pointers to objects
destroyed by a C++ destructor

6 files changed, 322 insertions, 0 deletions

diff --git a/Firestore/core/test/firebase/firestore/auth/CMakeLists.txt b/Firestore/core/test/firebase/firestore/auth/CMakeLists.txt
new file mode 100644
index 0000000..f470bd7
--- /dev/null
+++ b/Firestore/core/test/firebase/firestore/auth/CMakeLists.txt
@@ -0,0 +1,34 @@
+# 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.
+
+cc_test(
+  firebase_firestore_auth_test
+  SOURCES
+    credentials_provider_test.cc
+    empty_credentials_provider_test.cc
+    token_test.cc
+    user_test.cc
+  DEPENDS
+    firebase_firestore_auth
+)
+
+if(APPLE)
+  cc_test(
+    firebase_firestore_auth_apple_test
+    SOURCES
+      firebase_credentials_provider_test.mm
+    DEPENDS
+      firebase_firestore_auth_apple
+  )
+endif(APPLE)
diff --git a/Firestore/core/test/firebase/firestore/auth/credentials_provider_test.cc b/Firestore/core/test/firebase/firestore/auth/credentials_provider_test.cc
new file mode 100644
index 0000000..1748422
--- /dev/null
+++ b/Firestore/core/test/firebase/firestore/auth/credentials_provider_test.cc
@@ -0,0 +1,53 @@
+/*
+ * 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.
+ */
+
+#include "Firestore/core/src/firebase/firestore/auth/credentials_provider.h"
+
+#include "gtest/gtest.h"
+
+namespace firebase {
+namespace firestore {
+namespace auth {
+
+#define UNUSED(x) (void)(x)
+
+TEST(CredentialsProvider, Typedef) {
+  TokenListener token_listener = [](const Token& token,
+                                    const absl::string_view error) {
+    UNUSED(token);
+    UNUSED(error);
+  };
+  EXPECT_NE(nullptr, token_listener);
+  EXPECT_TRUE(token_listener);
+
+  token_listener = nullptr;
+  EXPECT_EQ(nullptr, token_listener);
+  EXPECT_FALSE(token_listener);
+
+  UserChangeListener user_change_listener = [](const User& user) {
+    UNUSED(user);
+  };
+  EXPECT_NE(nullptr, user_change_listener);
+  EXPECT_TRUE(user_change_listener);
+
+  user_change_listener = nullptr;
+  EXPECT_EQ(nullptr, user_change_listener);
+  EXPECT_FALSE(user_change_listener);
+}
+
+}  // namespace auth
+}  // namespace firestore
+}  // namespace firebase
diff --git a/Firestore/core/test/firebase/firestore/auth/empty_credentials_provider_test.cc b/Firestore/core/test/firebase/firestore/auth/empty_credentials_provider_test.cc
new file mode 100644
index 0000000..123f952
--- /dev/null
+++ b/Firestore/core/test/firebase/firestore/auth/empty_credentials_provider_test.cc
@@ -0,0 +1,50 @@
+/*
+ * 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.
+ */
+
+#include "Firestore/core/src/firebase/firestore/auth/empty_credentials_provider.h"
+
+#include "gtest/gtest.h"
+
+namespace firebase {
+namespace firestore {
+namespace auth {
+
+TEST(EmptyCredentialsProvider, GetToken) {
+  EmptyCredentialsProvider credentials_provider;
+  credentials_provider.GetToken(
+      /*force_refresh=*/true,
+      [](const Token& token, const absl::string_view error) {
+        EXPECT_EQ("", token.token());
+        const User& user = token.user();
+        EXPECT_EQ("", user.uid());
+        EXPECT_FALSE(user.is_authenticated());
+        EXPECT_EQ("", error);
+      });
+}
+
+TEST(EmptyCredentialsProvider, SetListener) {
+  EmptyCredentialsProvider credentials_provider;
+  credentials_provider.SetUserChangeListener([](const User& user) {
+    EXPECT_EQ("", user.uid());
+    EXPECT_FALSE(user.is_authenticated());
+  });
+
+  credentials_provider.SetUserChangeListener(nullptr);
+}
+
+}  // namespace auth
+}  // namespace firestore
+}  // namespace firebase
diff --git a/Firestore/core/test/firebase/firestore/auth/firebase_credentials_provider_test.mm b/Firestore/core/test/firebase/firestore/auth/firebase_credentials_provider_test.mm
new file mode 100644
index 0000000..8d2b361
--- /dev/null
+++ b/Firestore/core/test/firebase/firestore/auth/firebase_credentials_provider_test.mm
@@ -0,0 +1,98 @@
+/*
+ * 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.
+ */
+
+#include "Firestore/core/src/firebase/firestore/auth/firebase_credentials_provider_apple.h"
+
+#import <FirebaseCore/FIRApp.h>
+#import <FirebaseCore/FIRAppInternal.h>
+#import <FirebaseCore/FIROptionsInternal.h>
+
+#include "Firestore/core/src/firebase/firestore/util/string_apple.h"
+
+#include "gtest/gtest.h"
+
+namespace firebase {
+namespace firestore {
+namespace auth {
+
+// TODO(zxu123): Make this an integration test and get infos from environment.
+// Set a .plist file here to enable the test-case.
+static NSString* const kPlist = @"";
+
+class FirebaseCredentialsProviderTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    app_ready_ = false;
+    if (![kPlist hasSuffix:@".plist"]) {
+      return;
+    }
+
+    static dispatch_once_t once_token;
+    dispatch_once(&once_token, ^{
+      FIROptions* options = [[FIROptions alloc] initWithContentsOfFile:kPlist];
+      [FIRApp configureWithOptions:options];
+    });
+
+    // Set getUID implementation.
+    FIRApp* default_app = [FIRApp defaultApp];
+    default_app.getUIDImplementation = ^NSString* {
+      return @"I'm a fake uid.";
+    };
+    app_ready_ = true;
+  }
+
+  bool app_ready_;
+};
+
+// Set kPlist above before enable.
+TEST_F(FirebaseCredentialsProviderTest, GetToken) {
+  if (!app_ready_) {
+    return;
+  }
+
+  FirebaseCredentialsProvider credentials_provider([FIRApp defaultApp]);
+  credentials_provider.GetToken(
+      /*force_refresh=*/true,
+      [](const Token& token, const absl::string_view error) {
+        EXPECT_EQ("", token.token());
+        const User& user = token.user();
+        EXPECT_EQ("I'm a fake uid.", user.uid());
+        EXPECT_TRUE(user.is_authenticated());
+        EXPECT_EQ("", error) << error;
+      });
+}
+
+// Set kPlist above before enable.
+TEST_F(FirebaseCredentialsProviderTest, SetListener) {
+  if (!app_ready_) {
+    return;
+  }
+
+  FirebaseCredentialsProvider credentials_provider([FIRApp defaultApp]);
+  credentials_provider.SetUserChangeListener([](const User& user) {
+    EXPECT_EQ("I'm a fake uid.", user.uid());
+    EXPECT_TRUE(user.is_authenticated());
+  });
+
+  // TODO(wilhuff): We should wait for the above expectations to actually happen
+  // before continuing.
+
+  credentials_provider.SetUserChangeListener(nullptr);
+}
+
+}  // namespace auth
+}  // namespace firestore
+}  // namespace firebase
diff --git a/Firestore/core/test/firebase/firestore/auth/token_test.cc b/Firestore/core/test/firebase/firestore/auth/token_test.cc
new file mode 100644
index 0000000..a0f2c48
--- /dev/null
+++ b/Firestore/core/test/firebase/firestore/auth/token_test.cc
@@ -0,0 +1,33 @@
+/*
+ * 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.
+ */
+
+#include "Firestore/core/src/firebase/firestore/auth/token.h"
+
+#include "gtest/gtest.h"
+
+namespace firebase {
+namespace firestore {
+namespace auth {
+
+TEST(Token, Getter) {
+  Token token("token", User("abc"));
+  EXPECT_EQ("token", token.token());
+  EXPECT_EQ(User("abc"), token.user());
+}
+
+}  // namespace auth
+}  // namespace firestore
+}  // namespace firebase
diff --git a/Firestore/core/test/firebase/firestore/auth/user_test.cc b/Firestore/core/test/firebase/firestore/auth/user_test.cc
new file mode 100644
index 0000000..a9f764d
--- /dev/null
+++ b/Firestore/core/test/firebase/firestore/auth/user_test.cc
@@ -0,0 +1,54 @@
+/*
+ * 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.
+ */
+
+#include "Firestore/core/src/firebase/firestore/auth/user.h"
+
+#include "gtest/gtest.h"
+
+namespace firebase {
+namespace firestore {
+namespace auth {
+
+TEST(User, Getter) {
+  User anonymous;
+  EXPECT_EQ("", anonymous.uid());
+  EXPECT_FALSE(anonymous.is_authenticated());
+
+  User signin("abc");
+  EXPECT_EQ("abc", signin.uid());
+  EXPECT_TRUE(signin.is_authenticated());
+
+  User copy;
+  copy = signin;
+  EXPECT_EQ(signin, copy);
+}
+
+TEST(User, Unauthenticated) {
+  User unauthenticated = User::Unauthenticated();
+  EXPECT_EQ("", unauthenticated.uid());
+  EXPECT_FALSE(unauthenticated.is_authenticated());
+}
+
+TEST(User, Comparison) {
+  EXPECT_EQ(User(), User());
+  EXPECT_EQ(User("abc"), User("abc"));
+  EXPECT_NE(User(), User("abc"));
+  EXPECT_NE(User("abc"), User("xyz"));
+}
+
+}  // namespace auth
+}  // namespace firestore
+}  // namespace firebase