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/*
* 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 "FIRAuthURLPresenter.h"
#import <SafariServices/SafariServices.h>
#import "FIRAuthDefaultUIDelegate.h"
#import "FIRAuthErrorUtils.h"
#import "FIRAuthGlobalWorkQueue.h"
#import "FIRAuthUIDelegate.h"
#import "FIRAuthWebViewController.h"
NS_ASSUME_NONNULL_BEGIN
@interface FIRAuthURLPresenter () <SFSafariViewControllerDelegate,
FIRAuthWebViewControllerDelegate>
@end
// Disable unguarded availability warnings because SFSafariViewController is been used throughout
// the code, including as an iVar, which cannot be simply excluded by @available check.
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunguarded-availability"
@implementation FIRAuthURLPresenter {
/** @var _isPresenting
@brief Whether or not some web-based content is being presented.
*/
BOOL _isPresenting;
/** @var _callbackMatcher
@brief The callback URL matcher for the current presentation, if one is active.
*/
FIRAuthURLCallbackMatcher _Nullable _callbackMatcher;
/** @var _safariViewController
@brief The SFSafariViewController used for the current presentation, if any.
*/
SFSafariViewController *_Nullable _safariViewController;
/** @var _webViewController
@brief The FIRAuthWebViewController used for the current presentation, if any.
*/
FIRAuthWebViewController *_Nullable _webViewController;
/** @var _UIDelegate
@brief The UIDelegate used to present the SFSafariViewController.
*/
id<FIRAuthUIDelegate> _UIDelegate;
/** @var _completion
@brief The completion handler for the current presentaion, if one is active.
@remarks This variable is also used as a flag to indicate a presentation is active.
*/
FIRAuthURLPresentationCompletion _Nullable _completion;
}
- (void)presentURL:(NSURL *)URL
UIDelegate:(nullable id<FIRAuthUIDelegate>)UIDelegate
callbackMatcher:(FIRAuthURLCallbackMatcher)callbackMatcher
completion:(FIRAuthURLPresentationCompletion)completion {
if (_isPresenting) {
// Unable to start a new presentation on top of another.
_completion(nil, [FIRAuthErrorUtils webContextAlreadyPresentedErrorWithMessage:nil]);
return;
}
_isPresenting = YES;
_callbackMatcher = callbackMatcher;
_completion = completion;
dispatch_async(dispatch_get_main_queue(), ^() {
self->_UIDelegate = UIDelegate ?: [FIRAuthDefaultUIDelegate defaultUIDelegate];
if ([SFSafariViewController class]) {
self->_safariViewController = [[SFSafariViewController alloc] initWithURL:URL];
self->_safariViewController.delegate = self;
[self->_UIDelegate presentViewController:self->_safariViewController
animated:YES
completion:nil];
return;
} else {
self->_webViewController = [[FIRAuthWebViewController alloc] initWithURL:URL delegate:self];
UINavigationController *navController =
[[UINavigationController alloc] initWithRootViewController:self->_webViewController];
[self->_UIDelegate presentViewController:navController animated:YES completion:nil];
}
});
}
- (BOOL)canHandleURL:(NSURL *)URL {
if (_isPresenting && _callbackMatcher && _callbackMatcher(URL)) {
[self finishPresentationWithURL:URL error:nil];
return YES;
}
return NO;
}
#pragma mark - SFSafariViewControllerDelegate
- (void)safariViewControllerDidFinish:(SFSafariViewController *)controller {
dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
if (controller == self->_safariViewController) {
self->_safariViewController = nil;
//TODO:Ensure that the SFSafariViewController is actually removed from the screen before
//invoking finishPresentationWithURL:error:
[self finishPresentationWithURL:nil
error:[FIRAuthErrorUtils webContextCancelledErrorWithMessage:nil]];
}
});
}
#pragma mark - FIRAuthwebViewControllerDelegate
- (BOOL)webViewController:(FIRAuthWebViewController *)webViewController canHandleURL:(NSURL *)URL {
__block BOOL result = NO;
dispatch_sync(FIRAuthGlobalWorkQueue(), ^() {
if (webViewController == self->_webViewController) {
result = [self canHandleURL:URL];
}
});
return result;
}
- (void)webViewControllerDidCancel:(FIRAuthWebViewController *)webViewController {
dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
if (webViewController == self->_webViewController) {
[self finishPresentationWithURL:nil
error:[FIRAuthErrorUtils webContextCancelledErrorWithMessage:nil]];
}
});
}
- (void)webViewController:(FIRAuthWebViewController *)webViewController
didFailWithError:(NSError *)error {
dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
if (webViewController == self->_webViewController) {
[self finishPresentationWithURL:nil error:error];
}
});
}
#pragma mark - Private methods
/** @fn finishPresentationWithURL:error:
@brief Finishes the presentation for a given URL, if any.
@param URL The URL to finish presenting.
@param error The error with which to finish presenting, if any.
*/
- (void)finishPresentationWithURL:(nullable NSURL *)URL
error:(nullable NSError *)error {
_callbackMatcher = nil;
id<FIRAuthUIDelegate> UIDelegate = _UIDelegate;
_UIDelegate = nil;
FIRAuthURLPresentationCompletion completion = _completion;
_completion = nil;
void (^finishBlock)(void) = ^() {
self->_isPresenting = NO;
completion(URL, error);
};
SFSafariViewController *safariViewController = _safariViewController;
_safariViewController = nil;
FIRAuthWebViewController *webViewController = _webViewController;
_webViewController = nil;
if (safariViewController || webViewController) {
dispatch_async(dispatch_get_main_queue(), ^() {
[UIDelegate dismissViewControllerAnimated:YES completion:^() {
dispatch_async(FIRAuthGlobalWorkQueue(), finishBlock);
}];
});
} else {
finishBlock();
}
}
#pragma clang diagnostic pop // ignored "-Wunguarded-availability"
@end
NS_ASSUME_NONNULL_END
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