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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 "Private/FIRAuthAppCredentialManager.h"
#import "Private/FIRAuthAppCredential.h"
#import "FIRAuthGlobalWorkQueue.h"
#import "FIRAuthKeychain.h"
NS_ASSUME_NONNULL_BEGIN
/** @var kKeychainDataKey
@brief The keychain key for the data.
*/
static NSString *const kKeychainDataKey = @"app_credentials";
/** @var kFullCredentialKey
@brief The data key for the full app credential.
*/
static NSString *const kFullCredentialKey = @"full_credential";
/** @var kPendingReceiptsKey
@brief The data key for the array of pending receipts.
*/
static NSString *const kPendingReceiptsKey = @"pending_receipts";
/** @var kMaximumNumberOfPendingReceipts
@brief The maximum number of partial credentials kept by this class.
*/
static const NSUInteger kMaximumNumberOfPendingReceipts = 32;
@implementation FIRAuthAppCredentialManager {
/** @var _keychain
@brief The keychain for app credentials to load from and to save to.
*/
FIRAuthKeychain *_keychain;
/** @var _pendingReceipts
@brief A list of pending receipts sorted in the order they were recorded.
*/
NSMutableArray<NSString *> *_pendingReceipts;
/** @var _callbacksByReceipt
@brief A map from pending receipts to callbacks.
*/
NSMutableDictionary<NSString *, FIRAuthAppCredentialCallback> *_callbacksByReceipt;
}
- (instancetype)initWithKeychain:(FIRAuthKeychain *)keychain {
self = [super init];
if (self) {
_keychain = keychain;
// Load the credentials from keychain if possible.
NSError *error;
NSData *encodedData = [_keychain dataForKey:kKeychainDataKey error:&error];
if (!error && encodedData) {
NSKeyedUnarchiver *unarchiver =
[[NSKeyedUnarchiver alloc] initForReadingWithData:encodedData];
FIRAuthAppCredential *credential =
[unarchiver decodeObjectOfClass:[FIRAuthAppCredential class]
forKey:kFullCredentialKey];
if ([credential isKindOfClass:[FIRAuthAppCredential class]]) {
_credential = credential;
}
NSSet<Class> *allowedClasses =
[NSSet<Class> setWithObjects:[NSArray class], [NSString class], nil];
NSArray<NSString *> *pendingReceipts =
[unarchiver decodeObjectOfClasses:allowedClasses forKey:kPendingReceiptsKey];
if ([pendingReceipts isKindOfClass:[NSArray class]]) {
_pendingReceipts = [pendingReceipts mutableCopy];
}
}
if (!_pendingReceipts) {
_pendingReceipts = [[NSMutableArray<NSString *> alloc] init];
}
_callbacksByReceipt =
[[NSMutableDictionary<NSString *, FIRAuthAppCredentialCallback> alloc] init];
}
return self;
}
- (NSUInteger)maximumNumberOfPendingReceipts {
return kMaximumNumberOfPendingReceipts;
}
- (void)didStartVerificationWithReceipt:(NSString *)receipt
timeout:(NSTimeInterval)timeout
callback:(FIRAuthAppCredentialCallback)callback {
[_pendingReceipts removeObject:receipt];
if (_pendingReceipts.count >= kMaximumNumberOfPendingReceipts) {
[_pendingReceipts removeObjectAtIndex:0];
}
[_pendingReceipts addObject:receipt];
_callbacksByReceipt[receipt] = callback;
[self saveData];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(timeout * NSEC_PER_SEC)),
FIRAuthGlobalWorkQueue(), ^{
[self callBackWithReceipt:receipt];
});
}
- (BOOL)canFinishVerificationWithReceipt:(NSString *)receipt secret:(NSString *)secret {
if (![_pendingReceipts containsObject:receipt]) {
return NO;
}
[_pendingReceipts removeObject:receipt];
_credential = [[FIRAuthAppCredential alloc] initWithReceipt:receipt secret:secret];
[self saveData];
[self callBackWithReceipt:receipt];
return YES;
}
- (void)clearCredential {
_credential = nil;
[self saveData];
}
#pragma mark - Internal methods
/** @fn saveData
@brief Save the data in memory to the keychain ignoring any errors.
*/
- (void)saveData {
NSMutableData *archiveData = [NSMutableData data];
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:archiveData];
[archiver encodeObject:_credential forKey:kFullCredentialKey];
[archiver encodeObject:_pendingReceipts forKey:kPendingReceiptsKey];
[archiver finishEncoding];
[_keychain setData:archiveData forKey:kKeychainDataKey error:NULL];
}
/** @fn callBackWithReceipt:
@brief Calls the saved callback for the specifc receipt.
@param receipt The receipt associated with the callback.
*/
- (void)callBackWithReceipt:(NSString *)receipt {
FIRAuthAppCredentialCallback callback = _callbacksByReceipt[receipt];
if (!callback) {
return;
}
[_callbacksByReceipt removeObjectForKey:receipt];
if (_credential) {
callback(_credential);
} else {
callback([[FIRAuthAppCredential alloc] initWithReceipt:receipt secret:nil]);
}
}
@end
NS_ASSUME_NONNULL_END
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