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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 "FAuthTokenProvider.h"
#import "FUtilities.h"
#import "FIRLogger.h"
#import "FIRDatabaseQuery_Private.h"
#import "FIRNoopAuthTokenProvider.h"
static NSString *const FIRAuthStateDidChangeInternalNotification = @"FIRAuthStateDidChangeInternalNotification";
static NSString *const FIRAuthStateDidChangeInternalNotificationTokenKey = @"FIRAuthStateDidChangeInternalNotificationTokenKey";
/**
* This is a hack that defines all the methods we need from FIRFirebaseApp. At runtime we use reflection to get an
* actual instance of FIRFirebaseApp. Since protocols don't carry any runtime information and selectors are invoked
* by name we can write code against this protocol as long as the method signatures of FIRFirebaseApp don't change.
*/
@protocol FIRFirebaseAppLike <NSObject>
- (void)getTokenForcingRefresh:(BOOL)forceRefresh withCallback:(void (^)(NSString *_Nullable token, NSError *_Nullable error))callback;
@end
/**
* This is a hack that defines all the methods we need from FIRAuth.
*/
@protocol FIRFirebaseAuthLike <NSObject>
- (id<FIRFirebaseAppLike>) app;
@end
/**
* This is a hack that copies the definitions of Firebase Auth error codes. If the error codes change in the original code, this
* will break at runtime due to undefined behavior!
*/
typedef NS_ENUM(NSUInteger, FIRErrorCode) {
/*! @var FIRErrorCodeNoAuth
@brief Represents the case where an auth-related message was sent to a @c FIRFirebaseApp
instance which has no associated @c FIRAuth instance.
*/
FIRErrorCodeNoAuth,
/*! @var FIRErrorCodeNoSignedInUser
@brief Represents the case where an attempt was made to fetch a token when there is no signed
in user.
*/
FIRErrorCodeNoSignedInUser,
};
@interface FAuthStateListenerWrapper : NSObject
@property (nonatomic, copy) fbt_void_nsstring listener;
@property (nonatomic, weak) id<FIRFirebaseAppLike> app;
@end
@implementation FAuthStateListenerWrapper
- (instancetype) initWithListener:(fbt_void_nsstring)listener app:(id<FIRFirebaseAppLike>)app {
self = [super init];
if (self != nil) {
self->_listener = listener;
self->_app = app;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(authStateDidChangeNotification:)
name:FIRAuthStateDidChangeInternalNotification
object:nil];
}
return self;
}
- (void) authStateDidChangeNotification:(NSNotification *)notification {
id<FIRFirebaseAuthLike> auth = notification.object;
if (auth.app == self->_app) {
NSDictionary *userInfo = notification.userInfo;
NSString *token = userInfo[FIRAuthStateDidChangeInternalNotificationTokenKey];
dispatch_async([FIRDatabaseQuery sharedQueue], ^{
self.listener(token);
});
}
}
- (void) dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
@end
@interface FIRFirebaseAuthTokenProvider : NSObject <FAuthTokenProvider>
@property (nonatomic, strong) id<FIRFirebaseAppLike> app;
/** Strong references to the auth listeners as they are only weak in FIRFirebaseApp */
@property (nonatomic, strong) NSMutableArray *authListeners;
- (instancetype) initWithFirebaseApp:(id<FIRFirebaseAppLike>)app;
@end
@implementation FIRFirebaseAuthTokenProvider
- (instancetype) initWithFirebaseApp:(id<FIRFirebaseAppLike>)app {
self = [super init];
if (self != nil) {
self->_app = app;
self->_authListeners = [NSMutableArray array];
}
return self;
}
- (void) fetchTokenForcingRefresh:(BOOL)forceRefresh withCallback:(fbt_void_nsstring_nserror)callback {
// TODO: Don't fetch token if there is no current user
[self.app getTokenForcingRefresh:forceRefresh withCallback:^(NSString * _Nullable token, NSError * _Nullable error) {
dispatch_async([FIRDatabaseQuery sharedQueue], ^{
if (error != nil) {
if (error.code == FIRErrorCodeNoAuth) {
FFLog(@"I-RDB073001", @"Firebase Auth is not configured, not going to use authentication.");
callback(nil, nil);
} else if (error.code == FIRErrorCodeNoSignedInUser) {
// No signed in user is an expected case, callback as success with no token
callback(nil, nil);
} else {
callback(nil, error);
}
} else {
callback(token, nil);
}
});
}];
}
- (void) listenForTokenChanges:(_Nonnull fbt_void_nsstring)listener {
FAuthStateListenerWrapper *wrapper = [[FAuthStateListenerWrapper alloc] initWithListener:listener app:self.app];
[self.authListeners addObject:wrapper];
}
@end
@implementation FAuthTokenProvider
+ (id<FAuthTokenProvider>) authTokenProviderForApp:(id)app {
return [[FIRFirebaseAuthTokenProvider alloc] initWithFirebaseApp:app];
}
@end
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