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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 <Foundation/Foundation.h>
#include "Firestore/core/src/firebase/firestore/auth/user.h"
NS_ASSUME_NONNULL_BEGIN
@class FIRApp;
@class FSTDispatchQueue;
#pragma mark - FSTGetTokenResult
/**
* The current User and the authentication token provided by the underlying authentication
* mechanism. This is the result of calling -[FSTCredentialsProvider getTokenForcingRefresh].
*
* ## Portability notes: no TokenType on iOS
*
* The TypeScript client supports 1st party Oauth tokens (for the Firebase Console to auth as the
* developer) and OAuth2 tokens for the node.js sdk to auth with a service account. We don't have
* plans to support either case on mobile so there's no TokenType here.
*/
// TODO(mcg): Rename FSTToken, change parameter order to line up with the other platforms.
@interface FSTGetTokenResult : NSObject
- (instancetype)init NS_UNAVAILABLE;
- (instancetype)initWithUser:(const firebase::firestore::auth::User &)user
token:(NSString *_Nullable)token NS_DESIGNATED_INITIALIZER;
/** The user with which the token is associated (used for persisting user state on disk, etc.). */
@property(nonatomic, assign, readonly) const firebase::firestore::auth::User &user;
/** The actual raw token. */
@property(nonatomic, copy, nullable, readonly) NSString *token;
@end
#pragma mark - Typedefs
/**
* `FSTVoidTokenErrorBlock` is a block that gets a token or an error.
*
* @param token An auth token as a string.
* @param error The error if one occurred, or else `nil`.
*/
typedef void (^FSTVoidGetTokenResultBlock)(FSTGetTokenResult *_Nullable token,
NSError *_Nullable error);
/** Listener block notified with a User. */
typedef void (^FSTVoidUserBlock)(const firebase::firestore::auth::User &user);
#pragma mark - FSTCredentialsProvider
/** Provides methods for getting the uid and token for the current user and listen for changes. */
@protocol FSTCredentialsProvider <NSObject>
/** Requests token for the current user, optionally forcing a refreshed token to be fetched. */
- (void)getTokenForcingRefresh:(BOOL)forceRefresh completion:(FSTVoidGetTokenResultBlock)completion;
/**
* A listener to be notified of user changes (sign-in / sign-out). It is immediately called once
* with the initial user.
*
* Note that this block will be called back on an arbitrary thread that is not the normal Firestore
* worker thread.
*/
@property(nonatomic, copy, nullable, readwrite) FSTVoidUserBlock userChangeListener;
@end
#pragma mark - FSTFirebaseCredentialsProvider
/**
* `FSTFirebaseCredentialsProvider` uses Firebase Auth via `FIRApp` to get an auth token.
*
* NOTE: To simplify the implementation, it requires that you set `userChangeListener` with a
* non-`nil` value no more than once and don't call `getTokenForcingRefresh:` after setting
* it to `nil`.
*
* This class must be implemented in a thread-safe manner since it is accessed from the thread
* backing our internal worker queue and the callbacks from FIRAuth will be executed on an
* arbitrary different thread.
*/
@interface FSTFirebaseCredentialsProvider : NSObject <FSTCredentialsProvider>
/**
* Initializes a new FSTFirebaseCredentialsProvider.
*
* @param app The Firebase app from which to get credentials.
*
* @return A new instance of FSTFirebaseCredentialsProvider.
*/
- (instancetype)initWithApp:(FIRApp *)app NS_DESIGNATED_INITIALIZER;
- (id)init NS_UNAVAILABLE;
@end
NS_ASSUME_NONNULL_END
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