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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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#import "GoogleUtilities/Environment/Public/GoogleUtilities/GULSecureCoding.h"
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NSString *const kGULSecureCodingError = @"GULSecureCodingError";
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@implementation GULSecureCoding
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+ (nullable id)unarchivedObjectOfClasses:(NSSet<Class> *)classes
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fromData:(NSData *)data
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error:(NSError **)outError {
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id object;
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#if __has_builtin(__builtin_available)
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if (@available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *)) {
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object = [NSKeyedUnarchiver unarchivedObjectOfClasses:classes fromData:data error:outError];
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} else
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#endif // __has_builtin(__builtin_available)
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{
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@try {
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
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#pragma clang diagnostic pop
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unarchiver.requiresSecureCoding = YES;
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object = [unarchiver decodeObjectOfClasses:classes forKey:NSKeyedArchiveRootObjectKey];
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} @catch (NSException *exception) {
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if (outError) {
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*outError = [self archivingErrorWithException:exception];
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}
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}
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if (object == nil && outError && *outError == nil) {
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NSString *failureReason = @"NSKeyedUnarchiver failed to unarchive data.";
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*outError = [NSError errorWithDomain:kGULSecureCodingError
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code:-1
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userInfo:@{NSLocalizedFailureReasonErrorKey : failureReason}];
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}
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}
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return object;
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}
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+ (nullable id)unarchivedObjectOfClass:(Class)class
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fromData:(NSData *)data
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error:(NSError **)outError {
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return [self unarchivedObjectOfClasses:[NSSet setWithObject:class] fromData:data error:outError];
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}
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+ (nullable NSData *)archivedDataWithRootObject:(id<NSCoding>)object error:(NSError **)outError {
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NSData *archiveData;
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#if __has_builtin(__builtin_available)
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if (@available(macOS 10.13, iOS 11.0, tvOS 11.0, watchOS 4.0, *)) {
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archiveData = [NSKeyedArchiver archivedDataWithRootObject:object
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requiringSecureCoding:YES
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error:outError];
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} else
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#endif // __has_builtin(__builtin_available)
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{
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@try {
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NSMutableData *data = [NSMutableData data];
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
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#pragma clang diagnostic pop
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archiver.requiresSecureCoding = YES;
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[archiver encodeObject:object forKey:NSKeyedArchiveRootObjectKey];
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[archiver finishEncoding];
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archiveData = [data copy];
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} @catch (NSException *exception) {
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if (outError) {
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*outError = [self archivingErrorWithException:exception];
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}
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}
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}
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return archiveData;
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}
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+ (NSError *)archivingErrorWithException:(NSException *)exception {
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NSString *failureReason = [NSString
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stringWithFormat:@"NSKeyedArchiver exception with name: %@, reason: %@, userInfo: %@",
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exception.name, exception.reason, exception.userInfo];
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NSDictionary *errorUserInfo = @{NSLocalizedFailureReasonErrorKey : failureReason};
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return [NSError errorWithDomain:kGULSecureCodingError code:-1 userInfo:errorUserInfo];
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}
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@end
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