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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 "Firestore/Source/Auth/FSTCredentialsProvider.h"
#import <FirebaseAuth/FIRAuth.h>
#import <FirebaseAuth/FIRUser.h>
#import <FirebaseCore/FIRApp.h>
#import <GRPCClient/GRPCCall.h>
// This is not an exported header so it's not visible via FirebaseCommunity
#import "Firebase/Core/Private/FIRAppInternal.h"
#import "FIRFirestoreErrors.h"
#import "Firestore/Source/Util/FSTAssert.h"
#import "Firestore/Source/Util/FSTClasses.h"
#import "Firestore/Source/Util/FSTDispatchQueue.h"
#import "Firestore/Source/Auth/FSTUser.h"
NS_ASSUME_NONNULL_BEGIN
#pragma mark - FSTGetTokenResult
@implementation FSTGetTokenResult
- (instancetype)initWithUser:(FSTUser *)user token:(NSString *_Nullable)token {
if (self = [super init]) {
_user = user;
_token = token;
}
return self;
}
@end
#pragma mark - FSTFirebaseCredentialsProvider
// TODO(mikelehen): Currently, we have a strong dependency on FIRAuth but we should ideally use
// only internal APIs on FIRApp instead. However, currently the FIRApp internal APIs don't expose
// the uid of the current user and don't expose an auth state change listener. So we use FIRAuth.
@interface FSTFirebaseCredentialsProvider ()
@property(nonatomic, strong, readonly) FIRApp *app;
@property(nonatomic, strong, readonly) FIRAuth *auth;
/** Handle used to stop receiving auth changes once userChangeListener is removed. */
@property(nonatomic, strong, nullable, readwrite)
FIRAuthStateDidChangeListenerHandle authListenerHandle;
/** The current user as reported to us via our AuthStateDidChangeListener. */
@property(nonatomic, strong, nonnull, readwrite) FSTUser *currentUser;
/**
* Counter used to detect if the user changed while a -getTokenForcingRefresh: request was
* outstanding.
*/
@property(nonatomic, assign, readwrite) int userCounter;
@end
@implementation FSTFirebaseCredentialsProvider {
FSTVoidUserBlock _userChangeListener;
}
- (instancetype)initWithApp:(FIRApp *)app {
self = [super init];
if (self) {
_app = app;
_auth = [FIRAuth authWithApp:app];
_currentUser = [[FSTUser alloc] initWithUID:self.auth.currentUser.uid];
_userCounter = 0;
// Register for user changes so that we can internally track the current user.
FSTWeakify(self);
_authListenerHandle = [self.auth addAuthStateDidChangeListener:^(FIRAuth *auth, FIRUser *user) {
FSTStrongify(self);
if (self) {
@synchronized(self) {
FSTUser *newUser = [[FSTUser alloc] initWithUID:user.uid];
if (![newUser isEqual:self.currentUser]) {
self.currentUser = newUser;
self.userCounter++;
FSTVoidUserBlock listenerBlock = self.userChangeListener;
if (listenerBlock) {
listenerBlock(self.currentUser);
}
}
}
}
}];
}
return self;
}
- (void)getTokenForcingRefresh:(BOOL)forceRefresh
completion:(FSTVoidGetTokenResultBlock)completion {
FSTAssert(self.authListenerHandle, @"getToken cannot be called after listener removed.");
// Take note of the current value of the userCounter so that this method can fail (with a
// FIRFirestoreErrorCodeAborted error) if there is a user change while the request is outstanding.
int initialUserCounter = self.userCounter;
void (^getTokenCallback)(NSString *, NSError *) = ^(NSString *_Nullable token,
NSError *_Nullable error) {
@synchronized(self) {
if (initialUserCounter != self.userCounter) {
// Cancel the request since the user changed while the request was outstanding so the
// response is likely for a previous user (which user, we can't be sure).
NSDictionary *errorInfo = @{ @"details" : @"getToken aborted due to user change." };
NSError *cancelError = [NSError errorWithDomain:FIRFirestoreErrorDomain
code:FIRFirestoreErrorCodeAborted
userInfo:errorInfo];
completion(nil, cancelError);
} else {
FSTGetTokenResult *result =
[[FSTGetTokenResult alloc] initWithUser:self.currentUser token:token];
completion(result, error);
}
};
};
[self.app getTokenForcingRefresh:forceRefresh withCallback:getTokenCallback];
}
- (void)setUserChangeListener:(nullable FSTVoidUserBlock)block {
@synchronized(self) {
if (block) {
FSTAssert(!_userChangeListener, @"UserChangeListener set twice!");
// Fire initial event.
block(self.currentUser);
} else {
FSTAssert(self.authListenerHandle, @"UserChangeListener removed twice!");
FSTAssert(_userChangeListener, @"UserChangeListener removed without being set!");
[self.auth removeAuthStateDidChangeListener:self.authListenerHandle];
self.authListenerHandle = nil;
}
_userChangeListener = block;
}
}
- (nullable FSTVoidUserBlock)userChangeListener {
@synchronized(self) {
return _userChangeListener;
}
}
@end
NS_ASSUME_NONNULL_END
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