650 lines
25 KiB
Objective-C
650 lines
25 KiB
Objective-C
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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#import "OWSAttachmentDownloads.h"
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#import "AppContext.h"
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#import "MIMETypeUtil.h"
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#import "NSNotificationCenter+OWS.h"
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#import "OWSBackgroundTask.h"
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#import "OWSDispatch.h"
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#import "OWSError.h"
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#import "OWSFileSystem.h"
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#import "OWSPrimaryStorage.h"
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#import "OWSRequestFactory.h"
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#import "SSKEnvironment.h"
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#import "TSAttachmentPointer.h"
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#import "TSAttachmentStream.h"
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#import "TSGroupModel.h"
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#import "TSGroupThread.h"
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#import "TSInfoMessage.h"
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#import "TSMessage.h"
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#import "TSNetworkManager.h"
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#import "TSThread.h"
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#import <PromiseKit/AnyPromise.h>
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#import <SessionCoreKit/Cryptography.h>
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#import <SessionServiceKit/SessionServiceKit-Swift.h>
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#import <YapDatabase/YapDatabaseConnection.h>
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NS_ASSUME_NONNULL_BEGIN
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NSString *const kAttachmentDownloadProgressNotification = @"kAttachmentDownloadProgressNotification";
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NSString *const kAttachmentDownloadProgressKey = @"kAttachmentDownloadProgressKey";
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NSString *const kAttachmentDownloadAttachmentIDKey = @"kAttachmentDownloadAttachmentIDKey";
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// Use a slightly non-zero value to ensure that the progress
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// indicator shows up as quickly as possible.
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static const CGFloat kAttachmentDownloadProgressTheta = 0.001f;
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typedef void (^AttachmentDownloadSuccess)(TSAttachmentStream *attachmentStream);
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typedef void (^AttachmentDownloadFailure)(NSError *error);
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@interface OWSAttachmentDownloadJob : NSObject
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@property (nonatomic, readonly) TSAttachmentPointer *attachmentPointer;
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@property (nonatomic, readonly, nullable) TSMessage *message;
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@property (nonatomic, readonly) AttachmentDownloadSuccess success;
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@property (nonatomic, readonly) AttachmentDownloadFailure failure;
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@property (atomic) CGFloat progress;
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@end
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#pragma mark -
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@implementation OWSAttachmentDownloadJob
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- (instancetype)initWithAttachmentPointer:(TSAttachmentPointer *)attachmentPointer
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message:(nullable TSMessage *)message
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success:(AttachmentDownloadSuccess)success
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failure:(AttachmentDownloadFailure)failure
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{
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self = [super init];
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if (!self) {
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return self;
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}
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_attachmentPointer = attachmentPointer;
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_message = message;
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_success = success;
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_failure = failure;
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return self;
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}
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@end
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#pragma mark -
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@interface OWSAttachmentDownloads ()
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// This property should only be accessed while synchronized on this class.
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@property (nonatomic, readonly) NSMutableDictionary<NSString *, OWSAttachmentDownloadJob *> *downloadingJobMap;
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// This property should only be accessed while synchronized on this class.
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@property (nonatomic, readonly) NSMutableArray<OWSAttachmentDownloadJob *> *attachmentDownloadJobQueue;
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@end
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#pragma mark -
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@implementation OWSAttachmentDownloads
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#pragma mark - Dependencies
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- (OWSPrimaryStorage *)primaryStorage
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{
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return SSKEnvironment.shared.primaryStorage;
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}
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- (TSNetworkManager *)networkManager
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{
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return SSKEnvironment.shared.networkManager;
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}
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#pragma mark -
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- (instancetype)init
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{
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self = [super init];
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if (!self) {
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return self;
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}
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_downloadingJobMap = [NSMutableDictionary new];
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_attachmentDownloadJobQueue = [NSMutableArray new];
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return self;
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}
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#pragma mark -
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- (nullable NSNumber *)downloadProgressForAttachmentId:(NSString *)attachmentId
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{
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@synchronized(self) {
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OWSAttachmentDownloadJob *_Nullable job = self.downloadingJobMap[attachmentId];
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if (!job) {
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return nil;
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}
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return @(job.progress);
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}
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}
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- (void)downloadAttachmentsForMessage:(TSMessage *)message
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transaction:(YapDatabaseReadTransaction *)transaction
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success:(void (^)(NSArray<TSAttachmentStream *> *attachmentStreams))success
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failure:(void (^)(NSError *error))failure
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{
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OWSAssertDebug(transaction);
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OWSAssertDebug(message);
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NSMutableArray<TSAttachmentStream *> *attachmentStreams = [NSMutableArray array];
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NSMutableArray<TSAttachmentPointer *> *attachmentPointers = [NSMutableArray new];
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for (TSAttachment *attachment in [message attachmentsWithTransaction:transaction]) {
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if ([attachment isKindOfClass:[TSAttachmentStream class]]) {
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TSAttachmentStream *attachmentStream = (TSAttachmentStream *)attachment;
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[attachmentStreams addObject:attachmentStream];
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} else if ([attachment isKindOfClass:[TSAttachmentPointer class]]) {
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TSAttachmentPointer *attachmentPointer = (TSAttachmentPointer *)attachment;
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if (attachmentPointer.pointerType != TSAttachmentPointerTypeIncoming) {
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OWSLogInfo(@"Ignoring restoring attachment.");
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continue;
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}
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[attachmentPointers addObject:attachmentPointer];
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} else {
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OWSFailDebug(@"Unexpected attachment type: %@", attachment.class);
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}
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}
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[self enqueueJobsForAttachmentStreams:attachmentStreams
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attachmentPointers:attachmentPointers
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message:message
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success:success
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failure:failure];
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}
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- (void)downloadAttachmentPointer:(TSAttachmentPointer *)attachmentPointer
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success:(void (^)(NSArray<TSAttachmentStream *> *attachmentStreams))success
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failure:(void (^)(NSError *error))failure
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{
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OWSAssertDebug(attachmentPointer);
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[self enqueueJobsForAttachmentStreams:@[]
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attachmentPointers:@[
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attachmentPointer,
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]
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message:nil
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success:success
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failure:failure];
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}
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- (void)enqueueJobsForAttachmentStreams:(NSArray<TSAttachmentStream *> *)attachmentStreamsParam
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attachmentPointers:(NSArray<TSAttachmentPointer *> *)attachmentPointers
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message:(nullable TSMessage *)message
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success:(void (^)(NSArray<TSAttachmentStream *> *attachmentStreams))successHandler
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failure:(void (^)(NSError *error))failureHandler
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{
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OWSAssertDebug(attachmentStreamsParam);
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// To avoid deadlocks, synchronize on self outside of the transaction.
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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if (attachmentPointers.count < 1) {
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OWSAssertDebug(attachmentStreamsParam.count > 0);
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successHandler(attachmentStreamsParam);
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return;
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}
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NSMutableArray<TSAttachmentStream *> *attachmentStreams = [attachmentStreamsParam mutableCopy];
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NSMutableArray<AnyPromise *> *promises = [NSMutableArray array];
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for (TSAttachmentPointer *attachmentPointer in attachmentPointers) {
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AnyPromise *promise = [AnyPromise promiseWithResolverBlock:^(PMKResolver resolve) {
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[self enqueueJobForAttachmentPointer:attachmentPointer
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message:message
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success:^(TSAttachmentStream *attachmentStream) {
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@synchronized(attachmentStreams) {
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[attachmentStreams addObject:attachmentStream];
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}
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resolve(@(1));
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}
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failure:^(NSError *error) {
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resolve(error);
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}];
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}];
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[promises addObject:promise];
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}
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// We use PMKJoin(), not PMKWhen(), because we don't want the
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// completion promise to execute until _all_ promises
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// have either succeeded or failed. PMKWhen() executes as
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// soon as any of its input promises fail.
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AnyPromise *completionPromise
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= PMKJoin(promises)
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.then(^(id value) {
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NSArray<TSAttachmentStream *> *attachmentStreamsCopy;
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@synchronized(attachmentStreams) {
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attachmentStreamsCopy = [attachmentStreams copy];
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}
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OWSLogInfo(@"Attachment downloads succeeded: %lu.", (unsigned long)attachmentStreamsCopy.count);
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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successHandler(attachmentStreamsCopy);
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});
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})
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.catch(^(NSError *error) {
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OWSLogError(@"Attachment downloads failed.");
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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failureHandler(error);
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});
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});
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[completionPromise retainUntilComplete];
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});
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}
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- (void)enqueueJobForAttachmentPointer:(TSAttachmentPointer *)attachmentPointer
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message:(nullable TSMessage *)message
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success:(void (^)(TSAttachmentStream *attachmentStream))success
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failure:(void (^)(NSError *error))failure
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{
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OWSAssertDebug(attachmentPointer);
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OWSAttachmentDownloadJob *job = [[OWSAttachmentDownloadJob alloc] initWithAttachmentPointer:attachmentPointer
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message:message
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success:success
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failure:failure];
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@synchronized(self) {
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[self.attachmentDownloadJobQueue addObject:job];
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}
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[self startDownloadIfPossible];
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}
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- (void)startDownloadIfPossible
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{
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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OWSAttachmentDownloadJob *_Nullable job;
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@synchronized(self) {
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const NSUInteger kMaxSimultaneousDownloads = 4;
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if (self.downloadingJobMap.count >= kMaxSimultaneousDownloads) {
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return;
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}
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job = self.attachmentDownloadJobQueue.firstObject;
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if (!job) {
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return;
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}
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if (self.downloadingJobMap[job.attachmentPointer.uniqueId] != nil) {
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// Ensure we only have one download in flight at a time for a given attachment.
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OWSLogWarn(@"Ignoring duplicate download.");
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return;
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}
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[self.attachmentDownloadJobQueue removeObjectAtIndex:0];
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self.downloadingJobMap[job.attachmentPointer.uniqueId] = job;
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}
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[LKStorage writeSyncWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
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job.attachmentPointer.state = TSAttachmentPointerStateDownloading;
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[job.attachmentPointer saveWithTransaction:transaction];
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if (job.message) {
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[job.message touchWithTransaction:transaction];
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}
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} error:nil];
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[self retrieveAttachmentForJob:job
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success:^(TSAttachmentStream *attachmentStream) {
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OWSLogVerbose(@"Attachment download succeeded.");
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[LKStorage writeSyncWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
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[attachmentStream saveWithTransaction:transaction];
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if (job.message) {
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[job.message touchWithTransaction:transaction];
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}
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} error:nil];
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job.success(attachmentStream);
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@synchronized(self) {
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[self.downloadingJobMap removeObjectForKey:job.attachmentPointer.uniqueId];
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}
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[self startDownloadIfPossible];
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}
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failure:^(NSError *error) {
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OWSLogError(@"Attachment download failed with error: %@", error);
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[LKStorage writeSyncWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
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job.attachmentPointer.mostRecentFailureLocalizedText = error.localizedDescription;
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job.attachmentPointer.state = TSAttachmentPointerStateFailed;
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[job.attachmentPointer saveWithTransaction:transaction];
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if (job.message) {
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[job.message touchWithTransaction:transaction];
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}
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} error:nil];
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@synchronized(self) {
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[self.downloadingJobMap removeObjectForKey:job.attachmentPointer.uniqueId];
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}
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job.failure(error);
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[self startDownloadIfPossible];
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}];
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});
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}
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#pragma mark -
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- (void)continueDownloadIfPossible
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{
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if (self.attachmentDownloadJobQueue.count > 0) {
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[LKLogger print:@"[Loki] Continuing unfinished attachment download tasks."];
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[self startDownloadIfPossible];
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}
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}
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#pragma mark -
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- (void)retrieveAttachmentForJob:(OWSAttachmentDownloadJob *)job
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success:(void (^)(TSAttachmentStream *attachmentStream))successHandler
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failure:(void (^)(NSError *error))failureHandler
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{
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OWSAssertDebug(job);
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TSAttachmentPointer *attachmentPointer = job.attachmentPointer;
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__block OWSBackgroundTask *_Nullable backgroundTask =
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[OWSBackgroundTask backgroundTaskWithLabelStr:__PRETTY_FUNCTION__];
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void (^markAndHandleFailure)(NSError *) = ^(NSError *error) {
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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failureHandler(error);
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OWSAssertDebug(backgroundTask);
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backgroundTask = nil;
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});
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};
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void (^markAndHandleSuccess)(TSAttachmentStream *attachmentStream) = ^(TSAttachmentStream *attachmentStream) {
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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successHandler(attachmentStream);
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OWSAssertDebug(backgroundTask);
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backgroundTask = nil;
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});
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};
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dispatch_async([OWSDispatch attachmentsQueue], ^{
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[self downloadFromLocation:attachmentPointer.downloadURL
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job:job
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success:^(NSString *encryptedDataFilePath) {
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[self decryptAttachmentPath:encryptedDataFilePath
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attachmentPointer:attachmentPointer
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success:markAndHandleSuccess
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failure:markAndHandleFailure];
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}
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failure:^(NSURLSessionTask *_Nullable task, NSError *error) {
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markAndHandleFailure(error);
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}];
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});
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}
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- (void)decryptAttachmentPath:(NSString *)encryptedDataFilePath
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attachmentPointer:(TSAttachmentPointer *)attachmentPointer
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success:(void (^)(TSAttachmentStream *attachmentStream))success
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failure:(void (^)(NSError *error))failure
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{
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OWSAssertDebug(encryptedDataFilePath.length > 0);
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OWSAssertDebug(attachmentPointer);
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// Use attachmentDecryptSerialQueue to ensure that we only load into memory
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// & decrypt a single attachment at a time.
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dispatch_async(self.attachmentDecryptSerialQueue, ^{
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@autoreleasepool {
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NSData *_Nullable encryptedData = [NSData dataWithContentsOfFile:encryptedDataFilePath];
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if (!encryptedData) {
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OWSLogError(@"Could not load encrypted data.");
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NSError *error = OWSErrorWithCodeDescription(
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OWSErrorCodeInvalidMessage, NSLocalizedString(@"ERROR_MESSAGE_INVALID_MESSAGE", @""));
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return failure(error);
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}
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[self decryptAttachmentData:encryptedData
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attachmentPointer:attachmentPointer
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success:success
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failure:failure];
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if (![OWSFileSystem deleteFile:encryptedDataFilePath]) {
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OWSLogError(@"Could not delete temporary file.");
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}
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}
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});
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}
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- (void)decryptAttachmentData:(NSData *)cipherText
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attachmentPointer:(TSAttachmentPointer *)attachmentPointer
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success:(void (^)(TSAttachmentStream *attachmentStream))successHandler
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failure:(void (^)(NSError *error))failureHandler
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{
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OWSAssertDebug(attachmentPointer);
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NSError *decryptError;
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NSData *_Nullable plaintext;
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if (attachmentPointer.encryptionKey != nil) {
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plaintext = [Cryptography decryptAttachment:cipherText
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withKey:attachmentPointer.encryptionKey
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digest:attachmentPointer.digest
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unpaddedSize:attachmentPointer.byteCount
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error:&decryptError];
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} else {
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plaintext = cipherText; // Loki: Public chat attachments are unencrypted
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}
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if (decryptError) {
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OWSLogError(@"failed to decrypt with error: %@", decryptError);
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failureHandler(decryptError);
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return;
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}
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if (!plaintext) {
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NSError *error = OWSErrorWithCodeDescription(
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OWSErrorCodeFailedToDecryptMessage, NSLocalizedString(@"ERROR_MESSAGE_INVALID_MESSAGE", @""));
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failureHandler(error);
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return;
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}
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TSAttachmentStream *stream = [[TSAttachmentStream alloc] initWithPointer:attachmentPointer];
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NSError *writeError;
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[stream writeData:plaintext error:&writeError];
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if (writeError) {
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OWSLogError(@"Failed writing attachment stream with error: %@", writeError);
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failureHandler(writeError);
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return;
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}
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successHandler(stream);
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}
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- (dispatch_queue_t)attachmentDecryptSerialQueue
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{
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static dispatch_queue_t _serialQueue;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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_serialQueue = dispatch_queue_create("org.whispersystems.attachment.decrypt", DISPATCH_QUEUE_SERIAL);
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});
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return _serialQueue;
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}
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- (void)downloadFromLocation:(NSString *)location
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job:(OWSAttachmentDownloadJob *)job
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success:(void (^)(NSString *encryptedDataPath))successHandler
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failure:(void (^)(NSURLSessionTask *_Nullable task, NSError *error))failureHandlerParam
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{
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OWSAssertDebug(job);
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TSAttachmentPointer *attachmentPointer = job.attachmentPointer;
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AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
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manager.requestSerializer = [AFHTTPRequestSerializer serializer];
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[manager.requestSerializer setValue:OWSMimeTypeApplicationOctetStream forHTTPHeaderField:@"Content-Type"];
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manager.responseSerializer = [AFHTTPResponseSerializer serializer];
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manager.completionQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
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// We want to avoid large downloads from a compromised or buggy service.
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const long kMaxDownloadSize = 10 * 1024 * 1024;
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__block BOOL hasCheckedContentLength = NO;
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NSString *tempFilePath =
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[OWSTemporaryDirectoryAccessibleAfterFirstAuth() stringByAppendingPathComponent:[NSUUID UUID].UUIDString];
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NSURL *tempFileURL = [NSURL fileURLWithPath:tempFilePath];
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__block NSURLSessionDownloadTask *task;
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void (^failureHandler)(NSError *) = ^(NSError *error) {
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OWSLogError(@"Failed to download attachment with error: %@", error.description);
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if (![OWSFileSystem deleteFileIfExists:tempFilePath]) {
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OWSLogError(@"Could not delete temporary file #1.");
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}
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failureHandlerParam(task, error);
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};
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NSString *method = @"GET";
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NSError *serializationError = nil;
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NSMutableURLRequest *request = [manager.requestSerializer requestWithMethod:method
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URLString:location
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parameters:nil
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error:&serializationError];
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if (serializationError) {
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return failureHandler(serializationError);
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}
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task = [manager downloadTaskWithRequest:request
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progress:^(NSProgress *progress) {
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OWSAssertDebug(progress != nil);
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// Don't do anything until we've received at least one byte of data.
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if (progress.completedUnitCount < 1) {
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return;
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}
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|
|
|
void (^abortDownload)(void) = ^{
|
|
OWSFailDebug(@"Download aborted.");
|
|
[task cancel];
|
|
};
|
|
|
|
if (progress.totalUnitCount > kMaxDownloadSize || progress.completedUnitCount > kMaxDownloadSize) {
|
|
// A malicious service might send a misleading content length header,
|
|
// so....
|
|
//
|
|
// If the current downloaded bytes or the expected total byes
|
|
// exceed the max download size, abort the download.
|
|
OWSLogError(@"Attachment download exceed expected content length: %lld, %lld.",
|
|
(long long)progress.totalUnitCount,
|
|
(long long)progress.completedUnitCount);
|
|
abortDownload();
|
|
return;
|
|
}
|
|
|
|
job.progress = progress.fractionCompleted;
|
|
|
|
[self fireProgressNotification:MAX(kAttachmentDownloadProgressTheta, progress.fractionCompleted)
|
|
attachmentId:attachmentPointer.uniqueId];
|
|
|
|
// We only need to check the content length header once.
|
|
if (hasCheckedContentLength) {
|
|
return;
|
|
}
|
|
|
|
// Once we've received some bytes of the download, check the content length
|
|
// header for the download.
|
|
//
|
|
// If the task doesn't exist, or doesn't have a response, or is missing
|
|
// the expected headers, or has an invalid or oversize content length, etc.,
|
|
// abort the download.
|
|
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)task.response;
|
|
if (![httpResponse isKindOfClass:[NSHTTPURLResponse class]]) {
|
|
OWSLogError(@"Attachment download has missing or invalid response.");
|
|
abortDownload();
|
|
return;
|
|
}
|
|
|
|
NSDictionary *headers = [httpResponse allHeaderFields];
|
|
if (![headers isKindOfClass:[NSDictionary class]]) {
|
|
OWSLogError(@"Attachment download invalid headers.");
|
|
abortDownload();
|
|
return;
|
|
}
|
|
|
|
|
|
NSString *contentLength = headers[@"Content-Length"];
|
|
if (![contentLength isKindOfClass:[NSString class]]) {
|
|
OWSLogError(@"Attachment download missing or invalid content length.");
|
|
abortDownload();
|
|
return;
|
|
}
|
|
|
|
|
|
if (contentLength.longLongValue > kMaxDownloadSize) {
|
|
OWSLogError(@"Attachment download content length exceeds max download size.");
|
|
abortDownload();
|
|
return;
|
|
}
|
|
|
|
// This response has a valid content length that is less
|
|
// than our max download size. Proceed with the download.
|
|
hasCheckedContentLength = YES;
|
|
}
|
|
destination:^(NSURL *targetPath, NSURLResponse *response) {
|
|
return tempFileURL;
|
|
}
|
|
completionHandler:^(NSURLResponse *response, NSURL *_Nullable filePath, NSError *_Nullable error) {
|
|
if (error) {
|
|
failureHandler(error);
|
|
return;
|
|
}
|
|
if (![tempFileURL isEqual:filePath]) {
|
|
OWSLogError(@"Unexpected temp file path.");
|
|
NSError *error = OWSErrorWithCodeDescription(
|
|
OWSErrorCodeInvalidMessage, NSLocalizedString(@"ERROR_MESSAGE_INVALID_MESSAGE", @""));
|
|
return failureHandler(error);
|
|
}
|
|
|
|
NSNumber *_Nullable fileSize = [OWSFileSystem fileSizeOfPath:tempFilePath];
|
|
if (!fileSize) {
|
|
OWSLogError(@"Could not determine attachment file size.");
|
|
NSError *error = OWSErrorWithCodeDescription(
|
|
OWSErrorCodeInvalidMessage, NSLocalizedString(@"ERROR_MESSAGE_INVALID_MESSAGE", @""));
|
|
return failureHandler(error);
|
|
}
|
|
if (fileSize.unsignedIntegerValue > kMaxDownloadSize) {
|
|
OWSLogError(@"Attachment download length exceeds max size.");
|
|
NSError *error = OWSErrorWithCodeDescription(
|
|
OWSErrorCodeInvalidMessage, NSLocalizedString(@"ERROR_MESSAGE_INVALID_MESSAGE", @""));
|
|
return failureHandler(error);
|
|
}
|
|
successHandler(tempFilePath);
|
|
}];
|
|
[task resume];
|
|
}
|
|
|
|
- (void)fireProgressNotification:(CGFloat)progress attachmentId:(NSString *)attachmentId
|
|
{
|
|
NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
|
|
[notificationCenter postNotificationNameAsync:kAttachmentDownloadProgressNotification
|
|
object:nil
|
|
userInfo:@{
|
|
kAttachmentDownloadProgressKey : @(progress),
|
|
kAttachmentDownloadAttachmentIDKey : attachmentId
|
|
}];
|
|
}
|
|
|
|
@end
|
|
|
|
NS_ASSUME_NONNULL_END
|