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V2Asset.swift
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V2Asset.swift
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//
// Wire
// Copyright (C) 2016 Wire Swiss GmbH
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see http://www.gnu.org/licenses/.
//
import Foundation
import MobileCoreServices
@objcMembers
public class V2Asset: NSObject, ZMImageMessageData {
public var isDownloaded: Bool {
return hasDownloadedFile
}
public func fetchImageData(
with queue: DispatchQueue,
completionHandler: @escaping ((Data?) -> Void)
) {
let cache = moc.zm_fileAssetCache
let mediumEncryptedKey = FileAssetCache.cacheKeyForAsset(
assetClientMessage,
format: .medium,
encrypted: true
)
let mediumKey = FileAssetCache.cacheKeyForAsset(
assetClientMessage,
format: .medium
)
let originalKey = FileAssetCache.cacheKeyForAsset(
assetClientMessage,
format: .original
)
let asset = assetClientMessage.underlyingMessage?.assetData?.uploaded
let key = asset?.otrKey
let digest = asset?.sha256
queue.async {
guard let cache else {
completionHandler(nil)
return
}
if
let mediumEncryptedKey,
let key,
let digest,
let data = cache.decryptData(
key: mediumEncryptedKey,
encryptionKey: key,
sha256Digest: digest
)
{
completionHandler(data)
} else if
let mediumKey,
let data = cache.assetData(mediumKey)
{
completionHandler(data)
} else if
let originalKey,
let data = cache.assetData(originalKey)
{
completionHandler(data)
} else {
completionHandler(nil)
}
}
}
fileprivate let assetClientMessage: ZMAssetClientMessage
fileprivate let moc: NSManagedObjectContext
public init?(with message: ZMAssetClientMessage) {
guard message.version < 3 else { return nil }
assetClientMessage = message
guard let managedObjectContext = message.managedObjectContext else { return nil }
moc = managedObjectContext
}
public var imageMessageData: ZMImageMessageData? {
guard assetClientMessage.mediumGenericMessage != nil || assetClientMessage.previewGenericMessage != nil else { return nil }
return self
}
// MARK: - ZMImageMessageData
private var mediumData: Data? {
guard
let asset = assetClientMessage.mediumGenericMessage?.imageAssetData,
asset.width > 0,
asset.size > 0,
let cache = moc.zm_fileAssetCache
else {
return nil
}
if let data = cache.decryptedMediumImageData(
for: assetClientMessage,
encryptionKey: asset.otrKey,
sha256Digest: asset.sha256
) {
return data
} else if let data = cache.mediumImageData(for: assetClientMessage) {
return data
} else {
return nil
}
}
public var imageData: Data? {
guard let cache = moc.zm_fileAssetCache else {
return nil
}
return mediumData ?? cache.originalImageData(for: assetClientMessage)
}
public var imageDataIdentifier: String? {
return FileAssetCache.cacheKeyForAsset(assetClientMessage, format: .medium)
}
public var imagePreviewDataIdentifier: String? {
return FileAssetCache.cacheKeyForAsset(assetClientMessage, format: .preview)
}
public var previewData: Data? {
if assetClientMessage.hasDownloadedPreview {
guard let cache = moc.zm_fileAssetCache else {
return nil
}
// File preview data
return cache.originalImageData(for: assetClientMessage) ?? cache.mediumImageData(for: assetClientMessage)
}
return nil
}
public var isAnimatedGIF: Bool {
guard let mimeType = assetClientMessage.mediumGenericMessage?.imageAssetData?.mimeType else {
return false
}
return UTIHelper.conformsToGifType(mime: mimeType)
}
public var imageType: String? {
return assetClientMessage.mediumGenericMessage?.imageAssetData?.mimeType
}
public var originalSize: CGSize {
guard let asset = assetClientMessage.mediumGenericMessage?.imageAssetData else { return .zero }
let size = CGSize(width: Int(asset.originalWidth), height: Int(asset.originalHeight))
if size != .zero {
return size
}
return assetClientMessage.preprocessedSize
}
}
extension V2Asset: AssetProxyType {
private var hasImageData: Bool {
guard let cache = moc.zm_fileAssetCache else {
return false
}
return cache.hasEncryptedMediumImageData(for: assetClientMessage)
|| cache.hasMediumImageData(for: assetClientMessage)
|| cache.hasOriginalImageData(for: assetClientMessage)
}
public var hasDownloadedPreview: Bool {
return assetClientMessage.fileMessageData != nil && hasImageData
}
public var hasDownloadedFile: Bool {
if assetClientMessage.imageMessageData != nil {
return hasImageData
} else {
guard let cache = moc.zm_fileAssetCache else {
return false
}
return cache.hasFileData(for: assetClientMessage)
}
}
public var fileURL: URL? {
guard let cache = moc.zm_fileAssetCache else {
return nil
}
if cache.hasEncryptedFileData(for: assetClientMessage) {
guard let asset = assetClientMessage.underlyingMessage?.assetData?.uploaded else {
return nil
}
return cache.temporaryURLForDecryptedFile(
for: assetClientMessage,
encryptionKey: asset.otrKey,
sha256Digest: asset.sha256
)
} else if cache.hasOriginalFileData(for: assetClientMessage) {
return cache.accessAssetURL(assetClientMessage)
} else {
return nil
}
}
public func requestFileDownload() {
guard assetClientMessage.fileMessageData != nil || assetClientMessage.imageMessageData != nil else { return }
guard !assetClientMessage.objectID.isTemporaryID, let moc = self.moc.zm_userInterface else { return }
if assetClientMessage.imageMessageData != nil {
NotificationInContext(name: ZMAssetClientMessage.imageDownloadNotificationName, context: moc.notificationContext, object: assetClientMessage.objectID).post()
} else {
NotificationInContext(name: ZMAssetClientMessage.assetDownloadNotificationName, context: moc.notificationContext, object: assetClientMessage.objectID).post()
}
}
public func requestPreviewDownload() {
guard !assetClientMessage.objectID.isTemporaryID, let moc = self.moc.zm_userInterface else { return }
if assetClientMessage.underlyingMessage?.assetData?.hasPreview == true {
NotificationInContext(name: ZMAssetClientMessage.imageDownloadNotificationName, context: moc.notificationContext, object: assetClientMessage.objectID).post()
}
}
}