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/*
* Copyright 2019 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>
@class FBLPromise<ValueType>;
NS_ASSUME_NONNULL_BEGIN
/// The class provides a convenient abstraction on top of the iOS Keychain API to save data.
@interface GULKeychainStorage : NSObject
- (instancetype)init NS_UNAVAILABLE;
/** Initializes the keychain storage with Keychain Service name.
* @param service A Keychain Service name that will be used to store and retrieve objects. See also
* `kSecAttrService`.
*/
- (instancetype)initWithService:(NSString *)service;
/**
* Get an object by key.
* @param key The key.
* @param objectClass The expected object class required by `NSSecureCoding`.
* @param accessGroup The Keychain Access Group.
*
* @return Returns a promise. It is resolved with an object stored by key if exists. It is resolved
* with `nil` when the object not found. It fails on a Keychain error.
*/
- (FBLPromise<id<NSSecureCoding>> *)getObjectForKey:(NSString *)key
objectClass:(Class)objectClass
accessGroup:(nullable NSString *)accessGroup;
/**
* Saves the given object by the given key.
* @param object The object to store.
* @param key The key to store the object. If there is an existing object by the key, it will be
* overridden.
* @param accessGroup The Keychain Access Group.
*
* @return Returns which is resolved with `[NSNull null]` on success.
*/
- (FBLPromise<NSNull *> *)setObject:(id<NSSecureCoding>)object
forKey:(NSString *)key
accessGroup:(nullable NSString *)accessGroup;
/**
* Removes the object by the given key.
* @param key The key to store the object. If there is an existing object by the key, it will be
* overridden.
* @param accessGroup The Keychain Access Group.
*
* @return Returns which is resolved with `[NSNull null]` on success.
*/
- (FBLPromise<NSNull *> *)removeObjectForKey:(NSString *)key
accessGroup:(nullable NSString *)accessGroup;
#if TARGET_OS_OSX
/// If not `nil`, then only this keychain will be used to save and read data (see
/// `kSecMatchSearchList` and `kSecUseKeychain`. It is mostly intended to be used by unit tests.
@property(nonatomic, nullable) SecKeychainRef keychainRef;
#endif // TARGET_OSX
@end
NS_ASSUME_NONNULL_END