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/*
* Copyright 2018 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.
*/
// Right now, FirebaseCredentialsProvider only support APPLE build.
#if !defined(__OBJC__)
#error "This header only supports Objective-C++."
#endif // !defined(__OBJC__)
#ifndef FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_AUTH_FIREBASE_CREDENTIALS_PROVIDER_APPLE_H_
#define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_AUTH_FIREBASE_CREDENTIALS_PROVIDER_APPLE_H_
#import <Foundation/Foundation.h>
#include <memory>
#include <mutex> // NOLINT(build/c++11)
#include <utility>
#include "Firestore/core/src/firebase/firestore/auth/credentials_provider.h"
#include "Firestore/core/src/firebase/firestore/auth/user.h"
#include "absl/strings/string_view.h"
@class FIRApp;
namespace firebase {
namespace firestore {
namespace auth {
/**
* `FirebaseCredentialsProvider` 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.
*
* For non-Apple desktop build, this is right now just a stub.
*/
class FirebaseCredentialsProvider : public CredentialsProvider {
public:
// TODO(zxu123): Provide a ctor to accept the C++ Firebase Games App, which
// deals all platforms. Right now, only works for FIRApp*.
/**
* Initializes a new FirebaseCredentialsProvider.
*
* @param app The Firebase app from which to get credentials.
*/
explicit FirebaseCredentialsProvider(FIRApp* app);
~FirebaseCredentialsProvider() override;
void GetToken(TokenListener completion) override;
void SetUserChangeListener(UserChangeListener listener) override;
void InvalidateToken() override;
private:
/**
* Most contents of the FirebaseCredentialProvider are kept in this
* Contents object and pointed to with a shared pointer. Callbacks
* registered with FirebaseAuth use weak pointers to the Contents to
* avoid races between notifications arriving and C++ object destruction.
*/
struct Contents {
Contents(FIRApp* app, User&& user)
: app(app), current_user(std::move(user)) {
}
const FIRApp* app;
/**
* The current user as reported to us via our AuthStateDidChangeListener.
*/
User current_user;
/**
* Counter used to detect if the user changed while a
* -getTokenForcingRefresh: request was outstanding.
*/
int user_counter = 0;
std::mutex mutex;
bool force_refresh = false;
};
/**
* Handle used to stop receiving auth changes once userChangeListener is
* removed.
*/
id<NSObject> auth_listener_handle_;
std::shared_ptr<Contents> contents_;
};
} // namespace auth
} // namespace firestore
} // namespace firebase
#endif // FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_AUTH_FIREBASE_CREDENTIALS_PROVIDER_APPLE_H_
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