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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>
NS_ASSUME_NONNULL_BEGIN
FOUNDATION_EXPORT NSString *const kGULKeychainUtilsErrorDomain;
/// Helper functions to access Keychain.
@interface GULKeychainUtils : NSObject
/** Fetches a keychain item data matching to the provided query.
* @param query A dictionary with Keychain query parameters. See docs for `SecItemCopyMatching` for
* details.
* @param outError A pointer to `NSError` instance or `NULL`. The instance at `outError` will be
* assigned with an error if there is.
* @returns Data for the first Keychain Item matching the provided query or `nil` if there is not
* such an item (`outError` will be `nil` in this case) or an error occurred.
*/
+ (nullable NSData *)getItemWithQuery:(NSDictionary *)query
error:(NSError *_Nullable *_Nullable)outError;
/** Stores data to a Keychain Item matching to the provided query. An existing Keychain Item
* matching the query parameters will be updated or a new will be created.
* @param item A Keychain Item data to store.
* @param query A dictionary with Keychain query parameters. See docs for `SecItemAdd` and
* `SecItemUpdate` for details.
* @param outError A pointer to `NSError` instance or `NULL`. The instance at `outError` will be
* assigned with an error if there is.
* @returns `YES` when data was successfully stored, `NO` otherwise.
*/
+ (BOOL)setItem:(NSData *)item
withQuery:(NSDictionary *)query
error:(NSError *_Nullable *_Nullable)outError;
/** Removes a Keychain Item matching to the provided query.
* @param query A dictionary with Keychain query parameters. See docs for `SecItemDelete` for
* details.
* @param outError A pointer to `NSError` instance or `NULL`. The instance at `outError` will be
* assigned with an error if there is.
* @returns `YES` if the item was removed successfully or doesn't exist, `NO` otherwise.
*/
+ (BOOL)removeItemWithQuery:(NSDictionary *)query error:(NSError *_Nullable *_Nullable)outError;
@end
NS_ASSUME_NONNULL_END
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