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/*
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* Copyright 2019 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "GoogleUtilities/Environment/Public/GoogleUtilities/GULKeychainUtils.h"
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NSString *const kGULKeychainUtilsErrorDomain = @"com.gul.keychain.ErrorDomain";
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@implementation GULKeychainUtils
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+ (nullable NSData *)getItemWithQuery:(NSDictionary *)query
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error:(NSError *_Nullable *_Nullable)outError {
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NSMutableDictionary *mutableQuery = [query mutableCopy];
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mutableQuery[(__bridge id)kSecReturnData] = @YES;
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mutableQuery[(__bridge id)kSecMatchLimit] = (__bridge id)kSecMatchLimitOne;
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CFDataRef result = NULL;
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OSStatus status =
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SecItemCopyMatching((__bridge CFDictionaryRef)mutableQuery, (CFTypeRef *)&result);
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if (status == errSecSuccess && result != NULL) {
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if (outError) {
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*outError = nil;
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}
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return (__bridge_transfer NSData *)result;
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}
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if (status == errSecItemNotFound) {
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if (outError) {
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*outError = nil;
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}
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} else {
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if (outError) {
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*outError = [self keychainErrorWithFunction:@"SecItemCopyMatching" status:status];
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}
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}
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return nil;
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}
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+ (BOOL)setItem:(NSData *)item
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withQuery:(NSDictionary *)query
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error:(NSError *_Nullable *_Nullable)outError {
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NSData *existingItem = [self getItemWithQuery:query error:outError];
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if (outError && *outError) {
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return NO;
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}
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NSMutableDictionary *mutableQuery = [query mutableCopy];
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mutableQuery[(__bridge id)kSecAttrAccessible] =
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(__bridge id)kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly;
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OSStatus status;
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if (!existingItem) {
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mutableQuery[(__bridge id)kSecValueData] = item;
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status = SecItemAdd((__bridge CFDictionaryRef)mutableQuery, NULL);
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} else {
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NSDictionary *attributes = @{(__bridge id)kSecValueData : item};
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status = SecItemUpdate((__bridge CFDictionaryRef)query, (__bridge CFDictionaryRef)attributes);
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}
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if (status == noErr) {
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if (outError) {
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*outError = nil;
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}
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return YES;
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}
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NSString *function = existingItem ? @"SecItemUpdate" : @"SecItemAdd";
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if (outError) {
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*outError = [self keychainErrorWithFunction:function status:status];
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}
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return NO;
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}
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+ (BOOL)removeItemWithQuery:(NSDictionary *)query error:(NSError *_Nullable *_Nullable)outError {
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OSStatus status = SecItemDelete((__bridge CFDictionaryRef)query);
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if (status == noErr || status == errSecItemNotFound) {
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if (outError) {
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*outError = nil;
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}
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return YES;
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}
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if (outError) {
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*outError = [self keychainErrorWithFunction:@"SecItemDelete" status:status];
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}
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return NO;
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}
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#pragma mark - Errors
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+ (NSError *)keychainErrorWithFunction:(NSString *)keychainFunction status:(OSStatus)status {
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NSString *failureReason = [NSString stringWithFormat:@"%@ (%li)", keychainFunction, (long)status];
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NSDictionary *userInfo = @{NSLocalizedFailureReasonErrorKey : failureReason};
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return [NSError errorWithDomain:kGULKeychainUtilsErrorDomain code:0 userInfo:userInfo];
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}
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@end
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