55 lines
2.4 KiB
Swift
55 lines
2.4 KiB
Swift
import Combine
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import Foundation
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import UIKit
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final class FileMiddleware {
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static let shared = FileMiddleware()
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func middleware(state _: AppState, action: AppAction) -> AnyPublisher<AppAction, Never> {
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switch action {
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case .conversationAction(.messagesUpdated(let messages)):
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return Future { promise in
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for message in messages where message.attachmentRemotePath != nil && message.attachmentLocalPath == nil {
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DispatchQueue.main.async {
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// swiftlint:disable:next force_unwrapping
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store.dispatch(.fileAction(.downloadAttachmentFile(id: message.id, attachmentRemotePath: message.attachmentRemotePath!)))
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}
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}
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promise(.success(.empty))
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}.eraseToAnyPublisher()
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case .fileAction(.downloadAttachmentFile(let id, let attachmentRemotePath)):
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return Future { promise in
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let localUrl = FileProcessing.fileFolder.appendingPathComponent(id).appendingPathExtension(attachmentRemotePath.pathExtension)
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DownloadManager.shared.enqueueDownload(from: attachmentRemotePath, to: localUrl) { error in
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DispatchQueue.main.async {
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if let error {
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store.dispatch(.fileAction(.downloadingAttachmentFileFailed(id: id, reason: error.localizedDescription)))
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} else {
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store.dispatch(.fileAction(.attachmentFileDownloaded(id: id, localUrl: localUrl)))
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}
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}
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}
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promise(.success(.empty))
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}.eraseToAnyPublisher()
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case .fileAction(.attachmentFileDownloaded(let id, let localUrl)):
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return Just(.fileAction(.createAttachmentThumbnail(id: id, localUrl: localUrl)))
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.eraseToAnyPublisher()
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case .fileAction(.createAttachmentThumbnail(let id, let localUrl)):
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return Future { promise in
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if let thumbnailUrl = FileProcessing.shared.createThumbnail(id: id, localUrl: localUrl) {
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promise(.success(.fileAction(.attachmentThumbnailCreated(id: id, thumbnailUrl: thumbnailUrl))))
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} else {
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promise(.success(.empty))
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}
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}
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.eraseToAnyPublisher()
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default:
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return Empty().eraseToAnyPublisher()
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}
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}
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}
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