session-ios/SessionShareExtension/ShareNavController.swift

// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.

import UIKit
import Combine
import CoreServices
import UniformTypeIdentifiers
import SignalUtilitiesKit
import SessionUIKit
import SessionSnodeKit
import SessionUtilitiesKit
import SessionMessagingKit

final class ShareNavController: UINavigationController, ShareViewDelegate {
    public static var attachmentPrepPublisher: AnyPublisher<[SignalAttachment], Error>?
    
    /// The `ShareNavController` is initialized from a storyboard so we need to manually initialize this
    private let dependencies: Dependencies = Dependencies.createEmpty()
    
    // MARK: - Error
    
    enum ShareViewControllerError: Error {
        case assertionError(description: String)
        case unsupportedMedia
        case notRegistered
        case obsoleteShare
    }
    
    // MARK: - Lifecycle
    
    override func loadView() {
        super.loadView()
        
        view.themeBackgroundColor = .backgroundPrimary

        /// This should be the first thing we do (Note: If you leave the share context and return to it the context will already exist, trying
        /// to override it results in the share context crashing so ensure it doesn't exist first)
        if !dependencies[singleton: .appContext].isValid {
            dependencies.set(singleton: .appContext, to: ShareAppExtensionContext(rootViewController: self, using: dependencies))
            Dependencies.setIsRTLRetriever(requiresMainThread: false) { ShareAppExtensionContext.determineDeviceRTL() }
        }

        guard !SNUtilitiesKit.isRunningTests else { return }
        
        dependencies.warmCache(cache: .appVersion)

        AppSetup.setupEnvironment(
            additionalMigrationTargets: [DeprecatedUIKitMigrationTarget.self],
            appSpecificBlock: { [dependencies] in
                // stringlint:ignore_start
                Log.setup(with: Logger(
                    primaryPrefix: "SessionShareExtension",
                    customDirectory: "\(dependencies[singleton: .fileManager].appSharedDataDirectoryPath)/Logs/ShareExtension",
                    using: dependencies
                ))
                // stringlint:ignore_stop
                
                // Setup LibSession
                LibSession.setupLogger(using: dependencies)
                dependencies.warmCache(cache: .libSessionNetwork)
                
                // Configure the different targets
                SNUtilitiesKit.configure(
                    networkMaxFileSize: Network.maxFileSize,
                    localizedFormatted: { helper, font in SAESNUIKitConfig.localizedFormatted(helper, font) },
                    localizedDeformatted: { helper in SAESNUIKitConfig.localizedDeformatted(helper) },
                    using: dependencies
                )
                SNMessagingKit.configure(using: dependencies)
            },
            migrationsCompletion: { [weak self, dependencies] result in
                switch result {
                    case .failure: Log.error("Failed to complete migrations")
                    case .success:
                        DispatchQueue.main.async {
                            /// Because the `SessionUIKit` target doesn't depend on the `SessionUtilitiesKit` dependency (it shouldn't
                            /// need to since it should just be UI) but since the theme settings are stored in the database we need to pass these through
                            /// to `SessionUIKit` and expose a mechanism to save updated settings - this is done here (once the migrations complete)
                            SNUIKit.configure(
                                with: SAESNUIKitConfig(using: dependencies),
                                themeSettings: dependencies[singleton: .storage].read { db -> ThemeSettings in
                                    (db[.theme], db[.themePrimaryColor], db[.themeMatchSystemDayNightCycle])
                                }
                            )
                            
                            self?.versionMigrationsDidComplete()
                        }
                }
            },
            using: dependencies
        )

        // We don't need to use "screen protection" in the SAE.
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(applicationDidEnterBackground),
            name: .sessionDidEnterBackground,
            object: nil
        )
    }
    
    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
        super.traitCollectionDidChange(previousTraitCollection)
        
        // Note: The share extension doesn't have a proper window so we need to manually update
        // the ThemeManager from here
        ThemeManager.traitCollectionDidChange(previousTraitCollection)
    }

    func versionMigrationsDidComplete() {
        Log.assertOnMainThread()

        /// Now that the migrations are completed schedule config syncs for **all** configs that have pending changes to
        /// ensure that any pending local state gets pushed and any jobs waiting for a successful config sync are run
        ///
        /// **Note:** We only want to do this if the app is active and ready for app extensions to run
        if dependencies[singleton: .appContext].isAppForegroundAndActive && dependencies[singleton: .storage, key: .isReadyForAppExtensions] {
            dependencies[singleton: .storage].writeAsync { [dependencies] db in
                dependencies.mutate(cache: .libSession) { $0.syncAllPendingChanges(db) }
            }
        }

        checkIsAppReady(migrationsCompleted: true)
    }

    func checkIsAppReady(migrationsCompleted: Bool) {
        Log.assertOnMainThread()

        // If something went wrong during startup then show the UI still (it has custom UI for
        // this case) but don't mark the app as ready or trigger the 'launchDidComplete' logic
        guard
            migrationsCompleted,
            dependencies[singleton: .storage].isValid,
            !dependencies[singleton: .appReadiness].isAppReady
        else { return showLockScreenOrMainContent() }

        // Note that this does much more than set a flag;
        // it will also run all deferred blocks.
        dependencies[singleton: .appReadiness].setAppReady()
        dependencies.mutate(cache: .appVersion) { $0.saeLaunchDidComplete() }

        showLockScreenOrMainContent()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        Log.appResumedExecution()
    }

    @objc
    public func applicationDidEnterBackground() {
        Log.assertOnMainThread()
        Log.flush()
        
        if dependencies[singleton: .storage, key: .isScreenLockEnabled] {
            self.dismiss(animated: false) { [weak self] in
                Log.assertOnMainThread()
                self?.extensionContext?.completeRequest(returningItems: [], completionHandler: nil)
            }
        }
    }

    deinit {
        NotificationCenter.default.removeObserver(self)
        Log.flush()

        // Share extensions reside in a process that may be reused between usages.
        // That isn't safe; the codebase is full of statics (e.g. singletons) which
        // we can't easily clean up.
        exit(0)
    }
    
    // MARK: - Updating
    
    private func showLockScreenOrMainContent() {
        if dependencies[singleton: .storage, key: .isScreenLockEnabled] {
            showLockScreen()
        }
        else {
            showMainContent()
        }
    }
    
    private func showLockScreen() {
        let screenLockVC = SAEScreenLockViewController(shareViewDelegate: self)
        setViewControllers([ screenLockVC ], animated: false)
    }
    
    private func showMainContent() {
        let threadPickerVC: ThreadPickerVC = ThreadPickerVC(using: dependencies)
        threadPickerVC.shareNavController = self
        
        setViewControllers([ threadPickerVC ], animated: false)
        
        let publisher = buildAttachments()
        ModalActivityIndicatorViewController
            .present(
                fromViewController: self,
                canCancel: false
            ) { activityIndicator in
                publisher
                    .subscribe(on: DispatchQueue.global(qos: .userInitiated))
                    .receive(on: DispatchQueue.main)
                    .sinkUntilComplete(
                        receiveCompletion: { _ in activityIndicator.dismiss { } }
                    )
            }
        ShareNavController.attachmentPrepPublisher = publisher
    }
    
    func shareViewWasUnlocked() {
        showMainContent()
    }
    
    func shareViewWasCompleted() {
        extensionContext?.completeRequest(returningItems: [], completionHandler: nil)
    }
    
    func shareViewWasCancelled() {
        extensionContext?.completeRequest(returningItems: [], completionHandler: nil)
    }
    
    func shareViewFailed(error: Error) {
        guard Thread.isMainThread else {
            DispatchQueue.main.async { [weak self] in
                self?.shareViewFailed(error: error)
            }
            return
        }
        
        let modal: ConfirmationModal = ConfirmationModal(
            targetView: self.view,
            info: ConfirmationModal.Info(
                title: Constants.app_name,
                body: .text("\(error)"),
                cancelTitle: "okay".localized(),
                cancelStyle: .alert_text,
                afterClosed: { [weak self] in self?.extensionContext?.cancelRequest(withError: error) }
            )
        )
        self.present(modal, animated: true)
    }
    
    // MARK: Attachment Prep

    private class func createDataSource(type: UTType, url: URL, customFileName: String?, using dependencies: Dependencies) -> (any DataSource)? {
        switch (type, type.conforms(to: .text)) {
            // Share URLs as text messages whose text content is the URL
            case (.url, _): return DataSourceValue(text: url.absoluteString, using: dependencies)
            
            // Share text as oversize text messages.
            //
            // NOTE: SharingThreadPickerViewController will try to unpack them
            //       and send them as normal text messages if possible.
            case (_, true): return DataSourcePath(fileUrl: url, sourceFilename: customFileName, shouldDeleteOnDeinit: false, using: dependencies)
            
            default:
                guard let dataSource = DataSourcePath(fileUrl: url, sourceFilename: customFileName, shouldDeleteOnDeinit: false, using: dependencies) else {
                    return nil
                }
                
                return dataSource
        }
    }

    private class func preferredItemProviders(inputItem: NSExtensionItem) -> [NSItemProvider]? {
        guard let attachments = inputItem.attachments else { return nil }

        var visualMediaItemProviders = [NSItemProvider]()
        var hasNonVisualMedia = false
        
        for attachment in attachments {
            if attachment.isVisualMediaItem {
                visualMediaItemProviders.append(attachment)
            }
            else {
                hasNonVisualMedia = true
            }
        }
        
        // Only allow multiple-attachment sends if all attachments
        // are visual media.
        if visualMediaItemProviders.count > 0 && !hasNonVisualMedia {
            return visualMediaItemProviders
        }

        // A single inputItem can have multiple attachments, e.g. sharing from Firefox gives
        // one url attachment and another text attachment, where the the url would be https://some-news.com/articles/123-cat-stuck-in-tree
        // and the text attachment would be something like "Breaking news - cat stuck in tree"
        //
        // FIXME: For now, we prefer the URL provider and discard the text provider, since it's more useful to share the URL than the caption
        // but we *should* include both. This will be a bigger change though since our share extension is currently heavily predicated
        // on one itemProvider per share.

        // Prefer a URL provider if available
        if let preferredAttachment = attachments.first(where: { (attachment: Any) -> Bool in
            guard let itemProvider = attachment as? NSItemProvider else {
                return false
            }
            
            return itemProvider.matches(type: .url)
        }) {
            return [preferredAttachment]
        }

        // else return whatever is available
        if let itemProvider = inputItem.attachments?.first {
            return [itemProvider]
        }
        else {
            Log.error("Missing attachment.")
        }
        
        return []
    }

    private func selectItemProviders() -> AnyPublisher<[NSItemProvider], Error> {
        guard let inputItems = self.extensionContext?.inputItems else {
            let error = ShareViewControllerError.assertionError(description: "no input item")
            return Fail(error: error)
                .eraseToAnyPublisher()
        }

        for inputItemRaw in inputItems {
            guard let inputItem = inputItemRaw as? NSExtensionItem else {
                Log.error("invalid inputItem \(inputItemRaw)")
                continue
            }
            
            if let itemProviders = ShareNavController.preferredItemProviders(inputItem: inputItem) {
                return Just(itemProviders)
                    .setFailureType(to: Error.self)
                    .eraseToAnyPublisher()
            }
        }
        let error = ShareViewControllerError.assertionError(description: "no input item")
        return Fail(error: error)
            .eraseToAnyPublisher()
    }
    
    // MARK: - LoadedItem

    private struct LoadedItem {
        let itemProvider: NSItemProvider
        let itemUrl: URL
        let type: UTType

        var customFileName: String?
        var isConvertibleToTextMessage = false
        var isConvertibleToContactShare = false

        init(itemProvider: NSItemProvider,
             itemUrl: URL,
             type: UTType,
             customFileName: String? = nil,
             isConvertibleToTextMessage: Bool = false,
             isConvertibleToContactShare: Bool = false) {
            self.itemProvider = itemProvider
            self.itemUrl = itemUrl
            self.type = type
            self.customFileName = customFileName
            self.isConvertibleToTextMessage = isConvertibleToTextMessage
            self.isConvertibleToContactShare = isConvertibleToContactShare
        }
    }
    
    private func loadItemProvider(itemProvider: NSItemProvider) -> AnyPublisher<LoadedItem, Error> {
        Log.info("utiTypes for attachment: \(itemProvider.registeredTypeIdentifiers)")

        // We need to be very careful about which UTI type we use.
        //
        // * In the case of "textual" shares (e.g. web URLs and text snippets), we want to
        //   coerce the UTI type to kUTTypeURL or kUTTypeText.
        // * We want to treat shared files as file attachments.  Therefore we do not
        //   want to treat file URLs like web URLs.
        // * UTIs aren't very descriptive (there are far more MIME types than UTI types)
        //   so in the case of file attachments we try to refine the attachment type
        //   using the file extension.
        guard let srcType: UTType = itemProvider.type else {
            let error = ShareViewControllerError.unsupportedMedia
            return Fail(error: error)
                .eraseToAnyPublisher()
        }
        Log.debug("matched UTType: \(srcType.identifier)")

        return Deferred { [weak self, dependencies] in
            Future<LoadedItem, Error> { resolver in
                let loadCompletion: NSItemProvider.CompletionHandler = { value, error in
                    guard self != nil else { return }
                    if let error: Error = error {
                        resolver(Result.failure(error))
                        return
                    }
                    
                    guard let value = value else {
                        resolver(
                            Result.failure(ShareViewControllerError.assertionError(description: "missing item provider"))
                        )
                        return
                    }
                    
                    Log.debug("value type: \(type(of: value))")
                    
                    switch value {
                        case let data as Data:
                            let customFileName = "Contact.vcf" // stringlint:ignore
                            let customFileExtension: String? = srcType.sessionFileExtension(sourceFilename: nil)
                            
                            guard let tempFilePath = try? dependencies[singleton: .fileManager].write(data: data, toTemporaryFileWithExtension: customFileExtension) else {
                                resolver(
                                    Result.failure(ShareViewControllerError.assertionError(description: "Error writing item data: \(String(describing: error))"))
                                )
                                return
                            }
                            let fileUrl = URL(fileURLWithPath: tempFilePath)
                            
                            resolver(
                                Result.success(
                                    LoadedItem(
                                        itemProvider: itemProvider,
                                        itemUrl: fileUrl,
                                        type: srcType,
                                        customFileName: customFileName,
                                        isConvertibleToContactShare: false
                                    )
                                )
                            )
                            
                        case let string as String:
                            Log.debug("string provider: \(string)")
                            guard let data = string.filteredForDisplay.data(using: String.Encoding.utf8) else {
                                resolver(
                                    Result.failure(ShareViewControllerError.assertionError(description: "Error writing item data: \(String(describing: error))"))
                                )
                                return
                            }
                            guard let tempFilePath: String = try? dependencies[singleton: .fileManager].write(data: data, toTemporaryFileWithExtension: "txt") else { // stringlint:ignore
                                resolver(
                                    Result.failure(ShareViewControllerError.assertionError(description: "Error writing item data: \(String(describing: error))"))
                                )
                                return
                            }
                            
                            let fileUrl = URL(fileURLWithPath: tempFilePath)
                            
                            let isConvertibleToTextMessage = !itemProvider.registeredTypeIdentifiers.contains(UTType.fileURL.identifier)
                            
                            if srcType.conforms(to: .text) {
                                resolver(
                                    Result.success(
                                        LoadedItem(
                                            itemProvider: itemProvider,
                                            itemUrl: fileUrl,
                                            type: srcType,
                                            isConvertibleToTextMessage: isConvertibleToTextMessage
                                        )
                                    )
                                )
                            }
                            else {
                                resolver(
                                    Result.success(
                                        LoadedItem(
                                            itemProvider: itemProvider,
                                            itemUrl: fileUrl,
                                            type: .text,
                                            isConvertibleToTextMessage: isConvertibleToTextMessage
                                        )
                                    )
                                )
                            }
                            
                        case let url as URL:
                            // If the share itself is a URL (e.g. a link from Safari), try to send this as a text message.
                            let isConvertibleToTextMessage = (
                                itemProvider.registeredTypeIdentifiers.contains(UTType.url.identifier) &&
                                !itemProvider.registeredTypeIdentifiers.contains(UTType.fileURL.identifier)
                            )
                            
                            if isConvertibleToTextMessage {
                                resolver(
                                    Result.success(
                                        LoadedItem(
                                            itemProvider: itemProvider,
                                            itemUrl: url,
                                            type: .url,
                                            isConvertibleToTextMessage: isConvertibleToTextMessage
                                        )
                                    )
                                )
                            }
                            else {
                                resolver(
                                    Result.success(
                                        LoadedItem(
                                            itemProvider: itemProvider,
                                            itemUrl: url,
                                            type: srcType,
                                            isConvertibleToTextMessage: isConvertibleToTextMessage
                                        )
                                    )
                                )
                            }
                            
                        case let image as UIImage:
                            if let data = image.pngData() {
                                let tempFilePath: String = dependencies[singleton: .fileManager].temporaryFilePath(fileExtension: "png") // stringlint:ignore
                                do {
                                    let url = NSURL.fileURL(withPath: tempFilePath)
                                    try data.write(to: url)
                                    
                                    resolver(
                                        Result.success(
                                            LoadedItem(
                                                itemProvider: itemProvider,
                                                itemUrl: url,
                                                type: srcType
                                            )
                                        )
                                    )
                                }
                                catch {
                                    resolver(
                                        Result.failure(ShareViewControllerError.assertionError(description: "couldn't write UIImage: \(String(describing: error))"))
                                    )
                                }
                            }
                            else {
                                resolver(
                                    Result.failure(ShareViewControllerError.assertionError(description: "couldn't convert UIImage to PNG: \(String(describing: error))"))
                                )
                            }
                            
                        default:
                            // It's unavoidable that we may sometimes receives data types that we
                            // don't know how to handle.
                            resolver(
                                Result.failure(ShareViewControllerError.assertionError(description: "unexpected value: \(String(describing: value))"))
                            )
                    }
                }
                
                itemProvider.loadItem(forTypeIdentifier: srcType.identifier, options: nil, completionHandler: loadCompletion)
            }
        }
        .eraseToAnyPublisher()
    }
    
    private func buildAttachment(forLoadedItem loadedItem: LoadedItem) -> AnyPublisher<SignalAttachment, Error> {
        let itemProvider = loadedItem.itemProvider
        let itemUrl = loadedItem.itemUrl

        var url = itemUrl
        do {
            if isVideoNeedingRelocation(itemProvider: itemProvider, itemUrl: itemUrl) {
                url = try SignalAttachment.copyToVideoTempDir(url: itemUrl, using: dependencies)
            }
        } catch {
            let error = ShareViewControllerError.assertionError(description: "Could not copy video")
            return Fail(error: error)
                .eraseToAnyPublisher()
        }

        Log.debug("building DataSource with url: \(url), UTType: \(loadedItem.type)")

        guard let dataSource = ShareNavController.createDataSource(type: loadedItem.type, url: url, customFileName: loadedItem.customFileName, using: dependencies) else {
            let error = ShareViewControllerError.assertionError(description: "Unable to read attachment data")
            return Fail(error: error)
                .eraseToAnyPublisher()
        }

        // start with base utiType, but it might be something generic like "image"
        var specificType: UTType = loadedItem.type
        if loadedItem.type == .url {
            // Use kUTTypeURL for URLs.
        } else if loadedItem.type.conforms(to: .text) {
            // Use kUTTypeText for text.
        } else if url.pathExtension.count > 0 {
            // Determine a more specific utiType based on file extension
            if let fileExtensionType: UTType = UTType(sessionFileExtension: url.pathExtension) {
                Log.debug("UTType based on extension: \(fileExtensionType.identifier)")
                specificType = fileExtensionType
            }
        }

        guard !SignalAttachment.isInvalidVideo(dataSource: dataSource, type: specificType) else {
            // This can happen, e.g. when sharing a quicktime-video from iCloud drive.
            let (publisher, _) = SignalAttachment.compressVideoAsMp4(dataSource: dataSource, type: specificType, using: dependencies)
            return publisher
        }

        let attachment = SignalAttachment.attachment(dataSource: dataSource, type: specificType, imageQuality: .medium, using: dependencies)
        if loadedItem.isConvertibleToContactShare {
            Log.debug("isConvertibleToContactShare")
            attachment.isConvertibleToContactShare = true
        } else if loadedItem.isConvertibleToTextMessage {
            Log.debug("isConvertibleToTextMessage")
            attachment.isConvertibleToTextMessage = true
        }
        return Just(attachment)
            .setFailureType(to: Error.self)
            .eraseToAnyPublisher()
    }

    private func buildAttachments() -> AnyPublisher<[SignalAttachment], Error> {
        return selectItemProviders()
            .tryFlatMap { [weak self] itemProviders -> AnyPublisher<[SignalAttachment], Error> in
                guard let strongSelf = self else {
                    throw ShareViewControllerError.assertionError(description: "expired")
                }

                var loadPublishers = [AnyPublisher<SignalAttachment, Error>]()

                for itemProvider in itemProviders.prefix(SignalAttachment.maxAttachmentsAllowed) {
                    let loadPublisher = strongSelf.loadItemProvider(itemProvider: itemProvider)
                        .flatMap { loadedItem -> AnyPublisher<SignalAttachment, Error> in
                            return strongSelf.buildAttachment(forLoadedItem: loadedItem)
                        }
                        .eraseToAnyPublisher()

                    loadPublishers.append(loadPublisher)
                }
                
                return Publishers
                    .MergeMany(loadPublishers)
                    .collect()
                    .eraseToAnyPublisher()
            }
            .tryMap { signalAttachments -> [SignalAttachment] in
                guard signalAttachments.count > 0 else {
                    throw ShareViewControllerError.assertionError(description: "no valid attachments")
                }
                
                return signalAttachments
            }
            .shareReplay(1)
            .eraseToAnyPublisher()
    }

    // Some host apps (e.g. iOS Photos.app) sometimes auto-converts some video formats (e.g. com.apple.quicktime-movie)
    // into mp4s as part of the NSItemProvider `loadItem` API. (Some files the Photo's app doesn't auto-convert)
    //
    // However, when using this url to the converted item, AVFoundation operations such as generating a
    // preview image and playing the url in the AVMoviePlayer fails with an unhelpful error: "The operation could not be completed"
    //
    // We can work around this by first copying the media into our container.
    //
    // I don't understand why this is, and I haven't found any relevant documentation in the NSItemProvider
    // or AVFoundation docs.
    //
    // Notes:
    //
    // These operations succeed when sending a video which initially existed on disk as an mp4.
    // (e.g. Alice sends a video to Bob through the main app, which ensures it's an mp4. Bob saves it, then re-shares it)
    //
    // I *did* verify that the size and SHA256 sum of the original url matches that of the copied url. So there
    // is no difference between the contents of the file, yet one works one doesn't.
    // Perhaps the AVFoundation APIs require some extra file system permssion we don't have in the
    // passed through URL.
    private func isVideoNeedingRelocation(itemProvider: NSItemProvider, itemUrl: URL) -> Bool {
        let pathExtension = itemUrl.pathExtension
        guard pathExtension.count > 0 else {
            Log.verbose("item URL has no file extension: \(itemUrl).")
            return false
        }
        guard let typeForURL: UTType = UTType(sessionFileExtension: pathExtension) else {
            Log.verbose("item has unknown UTI type: \(itemUrl).")
            return false
        }
        Log.verbose("typeForURL: \(typeForURL.identifier)")
        guard typeForURL == .mpeg4Movie else {
            // Either it's not a video or it was a video which was not auto-converted to mp4.
            // Not affected by the issue.
            return false
        }

        // If video file already existed on disk as an mp4, then the host app didn't need to
        // apply any conversion, so no need to relocate the app.
        return !itemProvider.registeredTypeIdentifiers.contains(UTType.mpeg4Movie.identifier)
    }
}

// MARK: - NSItemProvider Convenience

private extension NSItemProvider {
    var isVisualMediaItem: Bool {
        hasItemConformingToTypeIdentifier(UTType.image.identifier) ||
        hasItemConformingToTypeIdentifier(UTType.movie.identifier)
    }
    
    func matches(type: UTType) -> Bool {
        // URLs, contacts and other special items have to be detected separately.
        // Many shares (e.g. pdfs) will register many UTI types and/or conform to kUTTypeData.
        guard
            registeredTypeIdentifiers.count == 1,
            let firstTypeIdentifier: String = registeredTypeIdentifiers.first
        else { return false }
        
        return (firstTypeIdentifier == type.identifier)
    }

    var type: UTType? {
        switch (matches(type: .url), matches(type: .contact)) {
            case (true, _): return .url
            case (_, true): return .contact
            
            // Use the first UTI that conforms to "data".
            default:
                return registeredTypeIdentifiers
                    .compactMap { UTType($0) }
                    .first { $0.conforms(to: .data) }
        }
    }
}

// MARK: - SAESNUIKitConfig

private struct SAESNUIKitConfig: SNUIKit.ConfigType {
    private let dependencies: Dependencies
    
    var maxFileSize: UInt { Network.maxFileSize }
    var isStorageValid: Bool { dependencies[singleton: .storage].isValid }
    
    // MARK: - Initialization
    
    init(using dependencies: Dependencies) {
        self.dependencies = dependencies
    }
    
    // MARK: - Functions
    
    func themeChanged(_ theme: Theme, _ primaryColor: Theme.PrimaryColor, _ matchSystemNightModeSetting: Bool) {
        dependencies[singleton: .storage].write { db in
            db[.theme] = theme
            db[.themePrimaryColor] = primaryColor
            db[.themeMatchSystemDayNightCycle] = matchSystemNightModeSetting
        }
    }
    
    func persistentTopBannerChanged(warningKey: String?) {
        dependencies[defaults: .appGroup, key: .topBannerWarningToShow] = warningKey
    }
    
    func cachedContextualActionInfo(tableViewHash: Int, sideKey: String) -> [Int: Any]? {
        Log.warn("[SAESNUIKitConfig] Attempted to retrieve ContextualActionInfo when it's not supported.")
        return nil
    }
    
    func cacheContextualActionInfo(tableViewHash: Int, sideKey: String, actionIndex: Int, actionInfo: Any) {
        Log.warn("[SAESNUIKitConfig] Attempted to cache ContextualActionInfo when it's not supported.")
    }
    
    func removeCachedContextualActionInfo(tableViewHash: Int, keys: [String]) {}
    
    func placeholderIconCacher(cacheKey: String, generator: @escaping () -> UIImage) -> UIImage {
        if let cachedIcon: UIImage = dependencies[cache: .general].placeholderCache.object(forKey: cacheKey as NSString) {
            return cachedIcon
        }
        
        let generatedImage: UIImage = generator()
        dependencies.mutate(cache: .general) {
            $0.placeholderCache.setObject(generatedImage, forKey: cacheKey as NSString)
        }
        
        return generatedImage
    }
    
    func localizedString(for key: String) -> String {
        return key.localized()
    }
    
    public static func localizedFormatted(_ helper: LocalizationHelper, _ baseFont: UIFont) -> NSAttributedString {
        return NSAttributedString(stringWithHTMLTags: helper.localized(), font: baseFont)
    }
    
    public static func localizedDeformatted(_ helper: LocalizationHelper) -> String {
        return NSAttributedString(stringWithHTMLTags: helper.localized(), font: .systemFont(ofSize: 14)).string
    }
}