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OIDExternalUserAgentCatalyst.m
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OIDExternalUserAgentCatalyst.m
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/*! @file OIDExternalUserAgentCatalyst.m
@brief AppAuth iOS SDK
@copyright
Copyright 2019 The AppAuth Authors. All Rights Reserved.
@copydetails
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 <TargetConditionals.h>
#if TARGET_OS_IOS || TARGET_OS_MACCATALYST
#import "OIDExternalUserAgentCatalyst.h"
#import <SafariServices/SafariServices.h>
#import <AuthenticationServices/AuthenticationServices.h>
#import "OIDErrorUtilities.h"
#import "OIDExternalUserAgentSession.h"
#import "OIDExternalUserAgentRequest.h"
#if TARGET_OS_MACCATALYST
NS_ASSUME_NONNULL_BEGIN
@interface OIDExternalUserAgentCatalyst ()<ASWebAuthenticationPresentationContextProviding>
@end
@implementation OIDExternalUserAgentCatalyst {
UIViewController *_presentingViewController;
BOOL _prefersEphemeralSession;
BOOL _externalUserAgentFlowInProgress;
__weak id<OIDExternalUserAgentSession> _session;
ASWebAuthenticationSession *_webAuthenticationVC;
}
- (nullable instancetype)initWithPresentingViewController:
(UIViewController *)presentingViewController {
self = [super init];
if (self) {
_presentingViewController = presentingViewController;
}
return self;
}
- (nullable instancetype)initWithPresentingViewController:
(UIViewController *)presentingViewController
prefersEphemeralSession:(BOOL)prefersEphemeralSession {
self = [self initWithPresentingViewController:presentingViewController];
if (self) {
_prefersEphemeralSession = prefersEphemeralSession;
}
return self;
}
- (BOOL)presentExternalUserAgentRequest:(id<OIDExternalUserAgentRequest>)request
session:(id<OIDExternalUserAgentSession>)session {
if (_externalUserAgentFlowInProgress) {
// TODO: Handle errors as authorization is already in progress.
return NO;
}
_externalUserAgentFlowInProgress = YES;
_session = session;
BOOL openedUserAgent = NO;
NSURL *requestURL = [request externalUserAgentRequestURL];
__weak OIDExternalUserAgentCatalyst *weakSelf = self;
NSString *redirectScheme = request.redirectScheme;
ASWebAuthenticationSession *authenticationVC =
[[ASWebAuthenticationSession alloc] initWithURL:requestURL
callbackURLScheme:redirectScheme
completionHandler:^(NSURL * _Nullable callbackURL,
NSError * _Nullable error) {
__strong OIDExternalUserAgentCatalyst *strongSelf = weakSelf;
if (!strongSelf) {
return;
}
strongSelf->_webAuthenticationVC = nil;
if (callbackURL) {
[strongSelf->_session resumeExternalUserAgentFlowWithURL:callbackURL];
} else {
NSError *safariError =
[OIDErrorUtilities errorWithCode:OIDErrorCodeUserCanceledAuthorizationFlow
underlyingError:error
description:nil];
[strongSelf->_session failExternalUserAgentFlowWithError:safariError];
}
}];
authenticationVC.presentationContextProvider = self;
authenticationVC.prefersEphemeralWebBrowserSession = _prefersEphemeralSession;
_webAuthenticationVC = authenticationVC;
openedUserAgent = [authenticationVC start];
if (!openedUserAgent) {
[self cleanUp];
NSError *safariError = [OIDErrorUtilities errorWithCode:OIDErrorCodeSafariOpenError
underlyingError:nil
description:@"Unable to open ASWebAuthenticationSession view controller."];
[session failExternalUserAgentFlowWithError:safariError];
}
return openedUserAgent;
}
- (void)dismissExternalUserAgentAnimated:(BOOL)animated completion:(void (^)(void))completion {
if (!_externalUserAgentFlowInProgress) {
// Ignore this call if there is no authorization flow in progress.
if (completion) completion();
return;
}
ASWebAuthenticationSession *webAuthenticationVC = _webAuthenticationVC;
[self cleanUp];
if (webAuthenticationVC) {
// dismiss the ASWebAuthenticationSession
[webAuthenticationVC cancel];
if (completion) completion();
} else {
if (completion) completion();
}
}
- (void)cleanUp {
// The weak reference to |_session| is set to nil to avoid accidentally using
// it while not in an authorization flow.
_webAuthenticationVC = nil;
_session = nil;
_externalUserAgentFlowInProgress = NO;
}
#pragma mark - ASWebAuthenticationPresentationContextProviding
- (ASPresentationAnchor)presentationAnchorForWebAuthenticationSession:(ASWebAuthenticationSession *)session {
return _presentingViewController.view.window;
}
@end
NS_ASSUME_NONNULL_END
#endif // TARGET_OS_MACCATALYST
#endif // TARGET_OS_IOS || TARGET_OS_MACCATALYST