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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 "FIRPhoneAuthProvider.h"
#import "FIRLogger.h"
#import "FIRPhoneAuthCredential_Internal.h"
#import "NSString+FIRAuth.h"
#import "FIRAuthAPNSToken.h"
#import "FIRAuthAPNSTokenManager.h"
#import "FIRAuthAppCredential.h"
#import "FIRAuthAppCredentialManager.h"
#import "FIRAuthGlobalWorkQueue.h"
#import "FIRAuth_Internal.h"
#import "FIRAuthNotificationManager.h"
#import "FIRAuthErrorUtils.h"
#import "FIRAuthBackend.h"
#import "FIRSendVerificationCodeRequest.h"
#import "FIRSendVerificationCodeResponse.h"
#import "FIRVerifyClientRequest.h"
#import "FIRVerifyClientResponse.h"
NS_ASSUME_NONNULL_BEGIN
/** @typedef FIRVerifyClientCallback
@brief The callback invoked at the end of a client verification flow.
@param appCredential credential that proves the identity of the app during a phone
authentication flow.
@param error The error that occured while verifying the app, if any.
*/
typedef void (^FIRVerifyClientCallback)(FIRAuthAppCredential *_Nullable appCredential,
NSError *_Nullable error);
@implementation FIRPhoneAuthProvider {
/** @var _auth
@brief The auth instance used to for verifying the phone number.
*/
FIRAuth *_auth;
}
/** @fn initWithAuth:
@brief returns an instance of @c FIRPhoneAuthProvider assocaited with the provided auth
instance.
@return An Instance of @c FIRPhoneAuthProvider.
*/
- (nullable instancetype)initWithAuth:(FIRAuth *)auth {
self = [super init];
if (self) {
_auth = auth;
}
return self;
}
- (void)verifyPhoneNumber:(NSString *)phoneNumber
completion:(nullable FIRVerificationResultCallback)completion {
dispatch_async(FIRAuthGlobalWorkQueue(), ^{
FIRVerificationResultCallback callBackOnMainThread = ^(NSString *_Nullable verificationID,
NSError *_Nullable error) {
if (completion) {
dispatch_async(dispatch_get_main_queue(), ^{
completion(verificationID, error);
});
}
};
if (!phoneNumber.length) {
callBackOnMainThread(nil,
[FIRAuthErrorUtils missingPhoneNumberErrorWithMessage:nil]);
return;
}
[_auth.notificationManager checkNotificationForwardingWithCallback:
^(BOOL isNotificationBeingForwarded) {
if (!isNotificationBeingForwarded) {
callBackOnMainThread(nil, [FIRAuthErrorUtils notificationNotForwardedError]);
return;
}
[self verifyClientAndSendVerificationCodeToPhoneNumber:phoneNumber
retryOnInvalidAppCredential:YES
callback:callBackOnMainThread];
}];
});
}
- (FIRPhoneAuthCredential *)credentialWithVerificationID:(NSString *)verificationID
verificationCode:(NSString *)verificationCode {
return [[FIRPhoneAuthCredential alloc] initWithProviderID:FIRPhoneAuthProviderID
verificationID:verificationID
verificationCode:verificationCode];
}
+ (instancetype)provider {
return [[self alloc]initWithAuth:[FIRAuth auth]];
}
+ (instancetype)providerWithAuth:(FIRAuth *)auth {
return [[self alloc]initWithAuth:auth];
}
#pragma mark - Internal Methods
/** @fn verifyClientAndSendVerificationCodeToPhoneNumber:retryOnInvalidAppCredential:callback:
@brief Starts the flow to verify the client via silent push notification.
@param retryOnInvalidAppCredential Whether of not the flow should be retried if an
FIRAuthErrorCodeInvalidAppCredential error is returned from the backend.
@param phoneNumber The phone number to be verified.
@param callback The callback to be invoked on the global work queue when the flow is
finished.
*/
- (void)verifyClientAndSendVerificationCodeToPhoneNumber:(NSString *)phoneNumber
retryOnInvalidAppCredential:(BOOL)retryOnInvalidAppCredential
callback:(FIRVerificationResultCallback)callback {
[self verifyClientWithCompletion:^(FIRAuthAppCredential *_Nullable appCredential,
NSError *_Nullable error) {
if (error) {
callback(nil, error);
return;
}
FIRSendVerificationCodeRequest *request =
[[FIRSendVerificationCodeRequest alloc] initWithPhoneNumber:phoneNumber
appCredential:appCredential
requestConfiguration:_auth.requestConfiguration];
[FIRAuthBackend sendVerificationCode:request
callback:^(FIRSendVerificationCodeResponse *_Nullable response,
NSError *_Nullable error) {
if (error) {
if (error.code == FIRAuthErrorCodeInvalidAppCredential) {
if (retryOnInvalidAppCredential) {
[_auth.appCredentialManager clearCredential];
[self verifyClientAndSendVerificationCodeToPhoneNumber:phoneNumber
retryOnInvalidAppCredential:NO
callback:callback];
return;
}
callback(nil, [FIRAuthErrorUtils unexpectedResponseWithDeserializedResponse:nil
underlyingError:error]);
return;
}
callback(nil, error);
return;
}
// Associate the phone number with the verification ID.
response.verificationID.fir_authPhoneNumber = phoneNumber;
callback(response.verificationID, nil);
}];
}];
}
/** @fn verifyClientWithCompletion:completion:
@brief Continues the flow to verify the client via silent push notification.
@param completion The callback to be invoked when the client verification flow is finished.
*/
- (void)verifyClientWithCompletion:(FIRVerifyClientCallback)completion {
if (_auth.appCredentialManager.credential) {
completion(_auth.appCredentialManager.credential, nil);
return;
}
[_auth.tokenManager getTokenWithCallback:^(FIRAuthAPNSToken * _Nullable token) {
if (!token) {
completion(nil, [FIRAuthErrorUtils missingAppTokenError]);
return;
}
// Convert token data to hex string.
NSUInteger capacity = token.data.length * 2;
NSMutableString *tokenString = [NSMutableString stringWithCapacity:capacity];
const unsigned char *tokenData = token.data.bytes;
for (int idx = 0; idx < token.data.length; ++idx) {
[tokenString appendFormat:@"%02X", (int)tokenData[idx]];
}
FIRVerifyClientRequest *request =
[[FIRVerifyClientRequest alloc] initWithAppToken:tokenString
isSandbox:token.type == FIRAuthAPNSTokenTypeSandbox
requestConfiguration:_auth.requestConfiguration];
[FIRAuthBackend verifyClient:request callback:^(FIRVerifyClientResponse *_Nullable response,
NSError *_Nullable error) {
if (error) {
completion(nil, error);
return;
}
NSTimeInterval timeout = [response.suggestedTimeOutDate timeIntervalSinceNow];
[_auth.appCredentialManager
didStartVerificationWithReceipt:response.receipt
timeout:timeout
callback:^(FIRAuthAppCredential *credential) {
if (!credential.secret) {
FIRLogWarning(kFIRLoggerAuth, @"I-AUT000014",
@"Failed to receive remote notification to verify app identity within "
@"%.0f second(s)", timeout);
}
completion(credential, nil);
}];
}];
}];
}
@end
NS_ASSUME_NONNULL_END
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