Add HttpFetcher component

Add class HttpFetcher fetches data from URL endpoint.
Add the FakeHttpFetcher.
Use HttpFetcher on GIDSignIn for revoking the grant scope.

GoogleSignIn/Sources/GIDHTTPFetcher/API/GIDHttpFetcher.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * 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>
+
+@protocol GTMSessionFetcherServiceProtocol;
+
+NS_ASSUME_NONNULL_BEGIN
+
+@protocol GIDHTTPFetcher <NSObject>
+
+/// Fetches the data from an URL request.
+///
+/// @param urlRequest The url request to fetch data.
+/// @param authorizer The object to add authorization to the request.
+/// @param comment The comment for logging purpose.
+/// @param completion The block that is called on completion asynchronously.
+- (void)fetchURLRequest:(NSURLRequest *)urlRequest
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+     withFetcherService:(id<GTMSessionFetcherServiceProtocol>)fetcherService
+#pragma clang diagnostic pop
+            withComment:(NSString *)comment
+             completion:(void (^)(NSData *_Nullable, NSError *_Nullable))completion;
+
+@end
+
+NS_ASSUME_NONNULL_END

GoogleSignIn/Sources/GIDHTTPFetcher/Implementations/Fakes/GIDFakeHTTPFetcher.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * 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 "GoogleSignIn/Sources/GIDHTTPFetcher/API/GIDHTTPFetcher.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/// The block which provides the response for the method
+/// fetchURLRequest:withAuthorizer:withComment:completion:`.
+///
+/// @param data The NSData returned if succeed,
+/// @param error The error returned if failed.
+typedef void(^GIDHTTPFetcherFakeResponseProviderBlock)(NSData *_Nullable data,
+                                                      NSError *_Nullable error);
+
+/// The block to set up data based on the input request for the method
+/// fetchURLRequest:withAuthorizer:withComment:completion:`.
+///
+/// @param request The request from input.
+/// @param responseProvider The block which provides the response.
+typedef void (^GIDHTTPFetcherTestBlock)(NSURLRequest *request,
+                                        GIDHTTPFetcherFakeResponseProviderBlock responseProvider);
+
+@interface GIDFakeHTTPFetcher : NSObject <GIDHTTPFetcher>
+
+/// Set the test block which provides the response value.
+- (void)setTestBlock:(GIDHTTPFetcherTestBlock)block;
+
+@end
+
+NS_ASSUME_NONNULL_END

GoogleSignIn/Sources/GIDHTTPFetcher/Implementations/Fakes/GIDFakeHTTPFetcher.m

@@ -0,0 +1,23 @@
+#import "GoogleSignIn/Sources/GIDHTTPFetcher/Implementations/Fakes/GIDFakeHTTPFetcher.h"
+
+@interface GIDFakeHTTPFetcher ()
+
+@property(nonatomic) GIDHTTPFetcherTestBlock testBlock;
+
+@end
+
+@implementation GIDFakeHTTPFetcher
+
+- (void)fetchURLRequest:(NSURLRequest *)urlRequest
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+         withFetcherService:(id<GTMSessionFetcherServiceProtocol>)fetcherService
+#pragma clang diagnostic pop
+            withComment:(NSString *)comment
+             completion:(void (^)(NSData *_Nullable, NSError *_Nullable))completion {
+  NSAssert(self.testBlock != nil, @"Set the test block before invoking this method.");
+  self.testBlock(urlRequest, ^(NSData *_Nullable data, NSError *_Nullable error) {
+    completion(data, error);
+  });
+}
+
+@end

GoogleSignIn/Sources/GIDHTTPFetcher/Implementations/GIDHTTPFetcher.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * 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 "GoogleSignIn/Sources/GIDHTTPFetcher/API/GIDHTTPFetcher.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface GIDHTTPFetcher : NSObject<GIDHTTPFetcher>
+@end
+
+NS_ASSUME_NONNULL_END

GoogleSignIn/Sources/GIDHTTPFetcher/Implementations/GIDHTTPFetcher.m

@@ -0,0 +1,37 @@
+#import "GoogleSignIn/Sources/GIDHTTPFetcher/Implementations/GIDHTTPFetcher.h"
+
+//#ifdef SWIFT_PACKAGE
+@import GTMAppAuth;
+//#else
+//#import <GTMAppAuth/GTMAppAuth.h>
+//#endif
+#import <GTMSessionFetcher/GTMSessionFetcher.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+// Maximum retry interval in seconds for the fetcher.
+static const NSTimeInterval kFetcherMaxRetryInterval = 15.0;
+
+@implementation GIDHTTPFetcher
+
+- (void)fetchURLRequest:(NSURLRequest *)urlRequest
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+         withFetcherService:(id<GTMSessionFetcherServiceProtocol>)fetcherService
+#pragma clang diagnostic pop
+            withComment:(NSString *)comment
+             completion:(void (^)(NSData *_Nullable, NSError *_Nullable))completion {
+  GTMSessionFetcher *fetcher;
+  if (fetcherService) {
+    fetcher = [fetcherService fetcherWithRequest:urlRequest];
+  } else {
+    fetcher = [GTMSessionFetcher fetcherWithRequest:urlRequest];
+  }
+  fetcher.retryEnabled = YES;
+  fetcher.maxRetryInterval = kFetcherMaxRetryInterval;
+  fetcher.comment = comment;
+  [fetcher beginFetchWithCompletionHandler:completion];
+}
+
+@end
+
+NS_ASSUME_NONNULL_END

GoogleSignIn/Sources/GIDSignIn.m

@@ -21,6 +21,8 @@
 #import "GoogleSignIn/Sources/Public/GoogleSignIn/GIDProfileData.h"
 #import "GoogleSignIn/Sources/Public/GoogleSignIn/GIDSignInResult.h"
 
+#import "GoogleSignIn/Sources/GIDHTTPFetcher/API/GIDHTTPFetcher.h"
+#import "GoogleSignIn/Sources/GIDHTTPFetcher/Implementations/GIDHTTPFetcher.h"
 #import "GoogleSignIn/Sources/GIDEMMSupport.h"
 #import "GoogleSignIn/Sources/GIDSignInInternalOptions.h"
 #import "GoogleSignIn/Sources/GIDSignInPreferences.h"
@@ -118,9 +120,6 @@
 // User preference key to detect fresh install of the app.
 static NSString *const kAppHasRunBeforeKey = @"GID_AppHasRunBefore";
 
-// Maximum retry interval in seconds for the fetcher.
-static const NSTimeInterval kFetcherMaxRetryInterval = 15.0;
-
 // The delay before the new sign-in flow can be presented after the existing one is cancelled.
 static const NSTimeInterval kPresentationDelayAfterCancel = 1.0;
 
@@ -163,6 +162,8 @@ @implementation GIDSignIn {
   OIDServiceConfiguration *_appAuthConfiguration;
   // AppAuth external user-agent session state.
   id<OIDExternalUserAgentSession> _currentAuthorizationFlow;
+  // The class to fetches data from a url end point.
+  id<GIDHTTPFetcher> _httpFetcher;
   // Flag to indicate that the auth flow is restarting.
   BOOL _restarting;
   // Keychain manager for GTMAppAuth
@@ -421,10 +422,13 @@ - (void)disconnectWithCompletion:(nullable GIDDisconnectCompletion)completion {
                      kEnvironmentLoggingParameter,
                      GIDEnvironment()];
   NSURL *revokeURL = [NSURL URLWithString:revokeURLString];
-  [self startFetchURL:revokeURL
-              fromAuthState:authState
-                withComment:@"GIDSignIn: revoke tokens"
-      withCompletionHandler:^(NSData *data, NSError *error) {
+  NSMutableURLRequest *revokeRequest = [NSMutableURLRequest requestWithURL:revokeURL];
+  GTMAuthSession *authorization = [[GTMAuthSession alloc] initWithAuthState:authState];
+  id<GTMSessionFetcherServiceProtocol> fetcherService = authorization.fetcherService;
+  [self->_httpFetcher fetchURLRequest:revokeRequest
+                   withFetcherService:fetcherService
+                          withComment:@"GIDSignIn: revoke tokens"
+                           completion:^(NSData *data, NSError *error) {
     // Revoking an already revoked token seems always successful, which helps us here.
     if (!error) {
       [self signOut];
@@ -450,7 +454,8 @@ + (GIDSignIn *)sharedInstance {
 
 #pragma mark - Private methods
 
-- (instancetype)initWithKeychainStore:(GTMKeychainStore *)keychainStore {
+- (instancetype)initWithKeychainStore:(GTMKeychainStore *)keychainStore
+                          httpFetcher:(id<GIDHTTPFetcher>)httpFetcher {
   self = [super init];
   if (self) {
     // Get the bundle of the current executable.
@@ -477,6 +482,7 @@ - (instancetype)initWithKeychainStore:(GTMKeychainStore *)keychainStore {
         initWithAuthorizationEndpoint:[NSURL URLWithString:authorizationEnpointURL]
                         tokenEndpoint:[NSURL URLWithString:tokenEndpointURL]];
     _keychainStore = keychainStore;
+    _httpFetcher = httpFetcher;
 
 #if TARGET_OS_IOS && !TARGET_OS_MACCATALYST
     // Perform migration of auth state from old (before 5.0) versions of the SDK if needed.
@@ -494,7 +500,9 @@ - (instancetype)initWithKeychainStore:(GTMKeychainStore *)keychainStore {
 - (instancetype)initPrivate {
   GTMKeychainStore *keychainStore =
       [[GTMKeychainStore alloc] initWithItemName:kGTMAppAuthKeychainName];
-  return [self initWithKeychainStore:keychainStore];
+  id<GIDHTTPFetcher> httpFetcher = [[GIDHTTPFetcher alloc] init];
+  return [self initWithKeychainStore:keychainStore
+                         httpFetcher:httpFetcher];
 }
 
 // Does sanity check for parameters and then authenticates if necessary.
@@ -823,10 +831,13 @@ - (void)addDecodeIdTokenCallback:(GIDAuthFlow *)authFlow {
           [NSString stringWithFormat:kUserInfoURLTemplate,
               [GIDSignInPreferences googleUserInfoServer],
               authState.lastTokenResponse.accessToken]];
-      [self startFetchURL:infoURL
-                  fromAuthState:authState
-                    withComment:@"GIDSignIn: fetch basic profile info"
-          withCompletionHandler:^(NSData *data, NSError *error) {
+      NSMutableURLRequest *infoRequest = [NSMutableURLRequest requestWithURL:infoURL];
+      GTMAuthSession *authorization = [[GTMAuthSession alloc] initWithAuthState:authState];
+      id<GTMSessionFetcherServiceProtocol> fetcherService = authorization.fetcherService;
+      [self->_httpFetcher fetchURLRequest:infoRequest
+                       withFetcherService:fetcherService
+                              withComment:@"GIDSignIn: fetch basic profile info"
+                               completion:^(NSData *data, NSError *error) {
         if (data && !error) {
           NSError *jsonDeserializationError;
           NSDictionary<NSString *, NSString *> *profileDict =
@@ -876,24 +887,24 @@ - (void)addCompletionCallback:(GIDAuthFlow *)authFlow {
   }];
 }
 
-- (void)startFetchURL:(NSURL *)URL
-            fromAuthState:(OIDAuthState *)authState
-              withComment:(NSString *)comment
-    withCompletionHandler:(void (^)(NSData *, NSError *))handler {
-  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
-  GTMSessionFetcher *fetcher;
-  GTMAuthSession *authorization = [[GTMAuthSession alloc] initWithAuthState:authState];
-  id<GTMSessionFetcherServiceProtocol> fetcherService = authorization.fetcherService;
-  if (fetcherService) {
-    fetcher = [fetcherService fetcherWithRequest:request];
-  } else {
-    fetcher = [GTMSessionFetcher fetcherWithRequest:request];
-  }
-  fetcher.retryEnabled = YES;
-  fetcher.maxRetryInterval = kFetcherMaxRetryInterval;
-  fetcher.comment = comment;
-  [fetcher beginFetchWithCompletionHandler:handler];
-}
+//- (void)startFetchURL:(NSURL *)URL
+//            fromAuthState:(OIDAuthState *)authState
+//              withComment:(NSString *)comment
+//    withCompletionHandler:(void (^)(NSData *, NSError *))handler {
+//  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
+//  GTMSessionFetcher *fetcher;
+//  GTMAuthSession *authorization = [[GTMAuthSession alloc] initWithAuthState:authState];
+//  id<GTMSessionFetcherServiceProtocol> fetcherService = authorization.fetcherService;
+//  if (fetcherService) {
+//    fetcher = [fetcherService fetcherWithRequest:request];
+//  } else {
+//    fetcher = [GTMSessionFetcher fetcherWithRequest:request];
+//  }
+//  fetcher.retryEnabled = YES;
+//  fetcher.maxRetryInterval = kFetcherMaxRetryInterval;
+//  fetcher.comment = comment;
+//  [fetcher beginFetchWithCompletionHandler:handler];
+//}
 
 // Parse incoming URL from the Google Device Policy app.
 - (BOOL)handleDevicePolicyAppURL:(NSURL *)url {

GoogleSignIn/Sources/GIDSignIn_Private.h

@@ -30,6 +30,8 @@ NS_ASSUME_NONNULL_BEGIN
 @class GIDSignInInternalOptions;
 @class GTMKeychainStore;
 
+@protocol GIDHTTPFetcher;
+
 /// Represents a completion block that takes a `GIDSignInResult` on success or an error if the
 /// operation was unsuccessful.
 typedef void (^GIDSignInCompletion)(GIDSignInResult *_Nullable signInResult,
@@ -48,7 +50,8 @@ typedef void (^GIDDisconnectCompletion)(NSError *_Nullable error);
 - (instancetype)initPrivate;
 
 /// Private initializer taking a `GTMKeychainStore` to use during tests.
-- (instancetype)initWithKeychainStore:(GTMKeychainStore *)keychainStore;
+- (instancetype)initWithKeychainStore:(GTMKeychainStore *)keychainStore
+                          httpFetcher:(id<GIDHTTPFetcher>)httpFetcher;
 
 /// Authenticates with extra options.
 - (void)signInWithOptions:(GIDSignInInternalOptions *)options;