486 lines
23 KiB
Swift
486 lines
23 KiB
Swift
import Foundation
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import Dispatch
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import Darwin
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struct YouTubeStream: Sendable {
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let url: String
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let headers: String
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}
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struct YouTubeVideo: Sendable {
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let title: String
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let video: YouTubeStream
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let audio: YouTubeStream?
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let duration: Double
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let isLive: Bool
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let webpageURL: URL
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let height: Int?
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let availableHeights: [Int]
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}
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private struct YouTubeResolutionError: LocalizedError {
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let message: String
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var errorDescription: String? { message }
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}
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enum YouTubeResolver {
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fileprivate static let outputLimit = 16 * 1024 * 1024
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static func validateURL(_ text: String) throws -> URL {
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let text = text.trimmingCharacters(in: .whitespacesAndNewlines)
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guard !text.isEmpty,
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!text.unicodeScalars.contains(where: { CharacterSet.whitespacesAndNewlines.contains($0) || CharacterSet.controlCharacters.contains($0) }),
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let components = URLComponents(string: text),
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let scheme = components.scheme?.lowercased(), ["http", "https"].contains(scheme),
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components.user == nil, components.password == nil,
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components.port == nil || components.port == (scheme == "https" ? 443 : 80),
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let host = components.host?.lowercased() else {
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throw YouTubeResolutionError(message: "Enter a valid HTTP or HTTPS YouTube video URL.")
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}
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let id: String?
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let path = components.path.split(separator: "/", omittingEmptySubsequences: false)
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if host == "youtu.be", path.count == 2, path[0].isEmpty {
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id = String(path[1])
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} else if ["youtube.com", "www.youtube.com", "m.youtube.com", "music.youtube.com"].contains(host) {
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if components.path == "/watch" {
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let videoIDs = components.queryItems?.filter { $0.name == "v" } ?? []
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id = videoIDs.count == 1 ? videoIDs[0].value : nil
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} else if path.count == 3, path[0].isEmpty, ["shorts", "live", "embed"].contains(String(path[1])) {
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id = String(path[2])
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} else {
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id = nil
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}
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} else {
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throw YouTubeResolutionError(message: "Only YouTube video URLs are supported.")
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}
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guard let id, id.utf8.count == 11,
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id.utf8.allSatisfy({ (65...90).contains($0) || (97...122).contains($0) || (48...57).contains($0) || $0 == 45 || $0 == 95 }) else {
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throw YouTubeResolutionError(message: "The YouTube URL must identify one video, not a playlist or channel.")
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}
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return URL(string: "https://www.youtube.com/watch?v=\(id)")!
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}
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static func decode(_ data: Data, webpageURL: URL, height: Int? = nil) throws -> YouTubeVideo {
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guard data.count <= outputLimit else {
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throw YouTubeResolutionError(message: "yt-dlp returned too much metadata for one video.")
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}
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let metadata: YouTubeMetadata
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do {
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metadata = try JSONDecoder().decode(YouTubeMetadata.self, from: data)
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} catch {
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throw YouTubeResolutionError(message: "yt-dlp returned malformed video metadata. Update yt-dlp and try again.")
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}
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guard metadata._type == nil || metadata._type == "video" else {
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throw YouTubeResolutionError(message: "yt-dlp did not resolve a single playable video.")
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}
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guard metadata.live_status != "is_upcoming" else {
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throw YouTubeResolutionError(message: "This livestream has not started yet.")
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}
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let duration = metadata.duration ?? 0
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guard duration.isFinite, duration >= 0 else {
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throw YouTubeResolutionError(message: "yt-dlp returned an invalid video duration.")
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}
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let videoFormat: YouTubeMetadata
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let audioFormat: YouTubeMetadata?
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if let formats = metadata.requested_formats {
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if formats.count == 1, formats[0].hasVideo, formats[0].hasAudio {
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videoFormat = formats[0]
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audioFormat = nil
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} else if formats.count == 2,
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let video = formats.first(where: { $0.hasVideo && $0.acodec == "none" }),
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let audio = formats.first(where: { $0.hasAudio && $0.vcodec == "none" }) {
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videoFormat = video
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audioFormat = audio
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} else {
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throw YouTubeResolutionError(message: "yt-dlp did not select a supported video and audio stream pair.")
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}
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} else {
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guard metadata.hasVideo, metadata.hasAudio else {
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throw YouTubeResolutionError(message: "No supported combined video and audio stream was returned.")
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}
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videoFormat = metadata
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audioFormat = nil
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}
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guard videoFormat.dynamic_range == nil || videoFormat.dynamic_range?.uppercased() == "SDR" else {
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throw YouTubeResolutionError(message: "This video has no supported SDR stream. HDR playback is not supported.")
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}
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guard videoFormat.height == nil || videoFormat.height! > 0 else {
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throw YouTubeResolutionError(message: "yt-dlp returned an invalid video resolution.")
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}
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if let height {
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guard height > 0, videoFormat.height == height else {
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throw YouTubeResolutionError(message: "The requested \(height)p resolution is no longer available. Choose another quality.")
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}
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} else if let selectedHeight = videoFormat.height, selectedHeight > 1080 {
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throw YouTubeResolutionError(message: "YouTube did not provide a supported stream at or below 1080p.")
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}
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let formats = metadata.formats ?? [videoFormat] + (audioFormat.map { [$0] } ?? [])
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let hasSeparateAudio = formats.contains {
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$0.hasAudio && !$0.hasVideo && (try? stream($0, fallbackHeaders: metadata.http_headers)) != nil
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}
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let availableHeights = Set(formats.compactMap { format -> Int? in
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guard format.hasVideo, format.hasAudio || hasSeparateAudio,
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format.dynamic_range == nil || format.dynamic_range?.uppercased() == "SDR",
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let height = format.height, height > 0,
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(try? stream(format, fallbackHeaders: metadata.http_headers)) != nil else { return nil }
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return height
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}).sorted(by: >)
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let video = try stream(videoFormat, fallbackHeaders: metadata.http_headers)
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let audio = try audioFormat.map { try stream($0, fallbackHeaders: metadata.http_headers) }
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let title = metadata.title?.trimmingCharacters(in: .whitespacesAndNewlines)
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return YouTubeVideo(
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title: title?.isEmpty == false ? title! : "YouTube video",
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video: video, audio: audio, duration: duration,
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isLive: metadata.is_live == true || metadata.live_status == "is_live",
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webpageURL: try validateURL(webpageURL.absoluteString),
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height: videoFormat.height, availableHeights: availableHeights
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)
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}
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static func resolve(_ url: URL, height: Int? = nil, executableURL: URL? = nil, runtimeURL: URL? = nil) async throws -> YouTubeVideo {
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try Task.checkCancellation()
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let webpageURL = try validateURL(url.absoluteString)
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guard height == nil || height! > 0 else {
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throw YouTubeResolutionError(message: "Choose a positive video resolution.")
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}
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let directories = searchDirectories()
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let executable = try executableURL.map { try executableFile($0, name: "yt-dlp") }
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?? findExecutable("yt-dlp", directories: directories)
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guard let executable else {
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throw YouTubeResolutionError(message: "YouTube playback requires yt-dlp. Install it with ‘brew install yt-dlp deno’, then try again.")
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}
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let runtime: URL?
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if let runtimeURL {
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runtime = try executableFile(runtimeURL, name: "JavaScript runtime")
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} else {
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runtime = ["deno", "node", "qjs", "quickjs", "bun"].lazy.compactMap { findExecutable($0, directories: directories) }.first
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}
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guard let runtime,
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let runtimeName = ["deno": "deno", "node": "node", "qjs": "quickjs", "quickjs": "quickjs", "bun": "bun"][runtime.lastPathComponent] else {
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throw YouTubeResolutionError(message: "YouTube playback requires a supported JavaScript runtime. Install Deno with ‘brew install deno’. Supported runtimes are Deno, Node, QuickJS, and Bun.")
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}
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var environment = ProcessInfo.processInfo.environment
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environment["PATH"] = directories.joined(separator: ":")
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let transport = "[protocol~='^(https?|m3u8(_native)?)$']"
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let resolution = height.map { "[height=\($0)]" } ?? "[height<=1080]"
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let arguments = [
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"--ignore-config", "--no-plugin-dirs", "--no-cache-dir", "--no-remote-components",
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"--no-playlist", "--simulate", "--skip-download", "--dump-single-json",
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"--no-progress", "--color", "never", "--no-check-formats",
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"--no-js-runtimes", "--js-runtimes", "\(runtimeName):\(runtime.path)",
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"--socket-timeout", "20", "--extractor-retries", "0", "--retries", "0",
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"--format-sort", "res", "--format-sort-force",
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"--format", "bestvideo*[dynamic_range=?SDR]\(resolution)\(transport)+bestaudio\(transport)/best[dynamic_range=?SDR]\(resolution)\(transport)",
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"--", webpageURL.absoluteString
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]
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let output = try await YouTubeExtraction(executable: executable, arguments: arguments, environment: environment).run()
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try Task.checkCancellation()
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if let error = dependencyError(String(decoding: output.stderr, as: UTF8.self).lowercased()) {
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throw error
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}
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let video = try decode(output.stdout, webpageURL: webpageURL, height: height)
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try Task.checkCancellation()
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return video
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}
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private static func stream(_ format: YouTubeMetadata, fallbackHeaders: [String: String]?) throws -> YouTubeStream {
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guard format.protocol == nil || ["http", "https", "m3u8", "m3u8_native"].contains(format.protocol!) else {
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throw YouTubeResolutionError(message: "yt-dlp selected a format that requires downloading and assembling fragments instead of native streaming.")
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}
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guard let text = format.url,
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!text.unicodeScalars.contains(where: { CharacterSet.whitespacesAndNewlines.contains($0) || CharacterSet.controlCharacters.contains($0) }),
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let components = URLComponents(string: text),
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let scheme = components.scheme?.lowercased(), ["http", "https"].contains(scheme),
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let host = components.host, !host.isEmpty,
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components.user == nil, components.password == nil,
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components.port == nil || (1...65535).contains(components.port!),
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let url = components.url else {
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throw YouTubeResolutionError(message: "yt-dlp returned an invalid HTTP stream URL.")
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}
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var headers = ""
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for (name, value) in (format.http_headers ?? fallbackHeaders ?? [:]).sorted(by: { $0.key < $1.key }) {
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guard !name.isEmpty,
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name.utf8.allSatisfy({ (65...90).contains($0) || (97...122).contains($0) || (48...57).contains($0) || "!#$%&'*+-.^_`|~".utf8.contains($0) }),
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!value.unicodeScalars.contains(where: { CharacterSet.controlCharacters.contains($0) || CharacterSet.newlines.contains($0) }) else {
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throw YouTubeResolutionError(message: "yt-dlp returned unsafe HTTP stream headers.")
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}
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headers += "\(name): \(value)\r\n"
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}
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return YouTubeStream(url: url.absoluteString, headers: headers)
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}
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private static func searchDirectories() -> [String] {
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let paths = (ProcessInfo.processInfo.environment["PATH"] ?? "").split(separator: ":").map(String.init)
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+ ["/opt/homebrew/bin", "/usr/local/bin", "/usr/bin", "/bin"]
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var result: [String] = []
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for path in paths where path.hasPrefix("/") && !result.contains(path) { result.append(path) }
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return result
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}
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private static func findExecutable(_ name: String, directories: [String]) -> URL? {
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for directory in directories {
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let url = URL(fileURLWithPath: directory).appendingPathComponent(name)
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if isExecutableFile(url) { return url }
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}
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return nil
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}
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private static func isExecutableFile(_ url: URL) -> Bool {
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var isDirectory: ObjCBool = false
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return url.isFileURL && FileManager.default.fileExists(atPath: url.path, isDirectory: &isDirectory)
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&& !isDirectory.boolValue && FileManager.default.isExecutableFile(atPath: url.path)
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}
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private static func executableFile(_ url: URL, name: String) throws -> URL {
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guard isExecutableFile(url) else {
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throw YouTubeResolutionError(message: "The \(name) executable is missing or is not executable.")
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}
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return url
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}
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fileprivate static func dependencyError(_ text: String) -> YouTubeResolutionError? {
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if text.contains("yt-dlp-ejs") || text.contains("challenge solving failed") || text.contains("no supported javascript") || text.contains("no javascript runtime") {
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return YouTubeResolutionError(message: "YouTube extraction requires current yt-dlp, its EJS components, and a supported JavaScript runtime. Run ‘brew upgrade yt-dlp deno’. For a pip installation, install ‘yt-dlp[default]’ and Deno.")
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}
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if text.contains("no such option") || text.contains("unrecognized arguments") {
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return YouTubeResolutionError(message: "The installed yt-dlp is too old for YouTube streaming. Update it with ‘brew upgrade yt-dlp’.")
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}
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return nil
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}
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fileprivate static func extractionError(_ data: Data, status: Int32) -> YouTubeResolutionError {
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let text = String(decoding: data, as: UTF8.self).lowercased()
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if let error = dependencyError(text) { return error }
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// Never include extractor output: it can contain signed URLs or credentials.
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if text.contains("sign in") || text.contains("login") || text.contains("private video") || text.contains("age-restricted") || text.contains("cookies") {
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return YouTubeResolutionError(message: "YouTube requires sign-in or additional access for this video. terebi does not read browser cookies; try a publicly accessible video.")
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}
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if text.contains("no video formats") || text.contains("no formats") || text.contains("requested format") {
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return YouTubeResolutionError(message: "YouTube did not provide a supported SDR video and audio stream. Update yt-dlp and try again.")
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}
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if text.contains("not available") || text.contains("unavailable") || text.contains("removed") || text.contains("copyright") || text.contains("blocked") {
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return YouTubeResolutionError(message: "This YouTube video is unavailable or restricted in your region.")
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}
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if text.contains("timed out") || text.contains("connection") || text.contains("http error") || text.contains("certificate") || text.contains("urlopen") {
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return YouTubeResolutionError(message: "Could not reach YouTube. Check your network connection and try again; update yt-dlp if the problem persists.")
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}
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return YouTubeResolutionError(message: "yt-dlp could not resolve this video (exit status \(status)). Update yt-dlp and Deno, then try again.")
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}
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}
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private struct YouTubeMetadata: Decodable {
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let _type: String?
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let title: String?
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let duration: Double?
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let is_live: Bool?
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let live_status: String?
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let url: String?
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let `protocol`: String?
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let vcodec: String?
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let acodec: String?
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let dynamic_range: String?
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let height: Int?
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let formats: [YouTubeMetadata]?
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let http_headers: [String: String]?
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let requested_formats: [YouTubeMetadata]?
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var hasVideo: Bool { vcodec.map { !$0.isEmpty && $0 != "none" } ?? false }
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var hasAudio: Bool { acodec.map { !$0.isEmpty && $0 != "none" } ?? false }
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}
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private struct YouTubeExtractionOutput: Sendable {
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let stdout: Data
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let stderr: Data
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}
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// All Process, pipe, and continuation state belongs to this request's serial queue.
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private final class YouTubeExtraction: @unchecked Sendable {
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private let queue = DispatchQueue(label: "terebi.youtube-extraction", qos: .userInitiated)
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private let process = Process()
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private let stdoutPipe = Pipe()
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private let stderrPipe = Pipe()
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private var stdoutSource: (any DispatchSourceRead)?
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private var stderrSource: (any DispatchSourceRead)?
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private var continuation: CheckedContinuation<YouTubeExtractionOutput, any Error>?
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private var stdout = Data()
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private var stderr = Data()
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private var scratch = [UInt8](repeating: 0, count: 16 * 1024)
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private var cancelled = false
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private var launched = false
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private var exited = false
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private var stdoutDone = false
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private var stderrDone = false
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private var finished = false
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private var failure: (any Error)?
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init(executable: URL, arguments: [String], environment: [String: String]) {
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process.executableURL = executable
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process.arguments = arguments
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process.environment = environment
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process.standardInput = FileHandle.nullDevice
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process.standardOutput = stdoutPipe
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process.standardError = stderrPipe
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}
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func run() async throws -> YouTubeExtractionOutput {
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try await withTaskCancellationHandler {
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try Task.checkCancellation()
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return try await withCheckedThrowingContinuation { continuation in
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queue.async { self.start(continuation) }
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}
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} onCancel: {
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self.queue.async { self.cancel() }
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}
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}
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private func start(_ continuation: CheckedContinuation<YouTubeExtractionOutput, any Error>) {
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self.continuation = continuation
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guard !cancelled else {
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finish(.failure(CancellationError()))
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return
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}
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let stdoutFD = stdoutPipe.fileHandleForReading.fileDescriptor
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let stderrFD = stderrPipe.fileHandleForReading.fileDescriptor
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for descriptor in [stdoutFD, stderrFD] {
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let flags = fcntl(descriptor, F_GETFL)
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guard flags >= 0, fcntl(descriptor, F_SETFL, flags | O_NONBLOCK) >= 0 else {
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finish(.failure(YouTubeResolutionError(message: "Could not create the yt-dlp output pipes.")))
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return
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}
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}
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stdoutSource = DispatchSource.makeReadSource(fileDescriptor: stdoutFD, queue: queue)
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stderrSource = DispatchSource.makeReadSource(fileDescriptor: stderrFD, queue: queue)
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stdoutSource?.setEventHandler { [weak self] in self?.drain(isStdout: true) }
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stderrSource?.setEventHandler { [weak self] in self?.drain(isStdout: false) }
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let stdoutHandle = stdoutPipe.fileHandleForReading
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let stderrHandle = stderrPipe.fileHandleForReading
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stdoutSource?.setCancelHandler { try? stdoutHandle.close() }
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stderrSource?.setCancelHandler { try? stderrHandle.close() }
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stdoutSource?.resume()
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stderrSource?.resume()
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process.terminationHandler = { [weak self] _ in
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guard let self else { return }
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self.queue.async { self.didExit() }
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}
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do {
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try process.run()
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launched = true
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try? stdoutPipe.fileHandleForWriting.close()
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try? stderrPipe.fileHandleForWriting.close()
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} catch {
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finish(.failure(YouTubeResolutionError(message: "Could not launch yt-dlp. Verify that yt-dlp is installed and executable.")))
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}
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}
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private func drain(isStdout: Bool) {
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guard !finished, !(isStdout ? stdoutDone : stderrDone) else { return }
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let handle = isStdout ? stdoutPipe.fileHandleForReading : stderrPipe.fileHandleForReading
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for _ in 0..<64 {
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let count = scratch.withUnsafeMutableBytes { Darwin.read(handle.fileDescriptor, $0.baseAddress!, $0.count) }
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if count > 0 {
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if isStdout {
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guard count <= YouTubeResolver.outputLimit - stdout.count else {
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failure = YouTubeResolutionError(message: "yt-dlp returned too much metadata for one video.")
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stop()
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return
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}
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scratch.withUnsafeBytes { stdout.append($0.bindMemory(to: UInt8.self).baseAddress!, count: count) }
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} else {
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let retained = min(count, 256 * 1024 - stderr.count)
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if retained > 0 {
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scratch.withUnsafeBytes { stderr.append($0.bindMemory(to: UInt8.self).baseAddress!, count: retained) }
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}
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}
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} else if count == 0 {
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closeStream(isStdout: isStdout)
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completeIfReady()
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return
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} else if errno == EINTR {
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continue
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} else if errno == EAGAIN || errno == EWOULDBLOCK {
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return
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} else {
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failure = YouTubeResolutionError(message: "Could not read yt-dlp output.")
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stop()
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return
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}
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}
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// Yield between batches so continuous extractor output cannot starve cancellation.
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queue.async { self.drain(isStdout: isStdout) }
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}
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private func didExit() {
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exited = true
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drain(isStdout: true)
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drain(isStdout: false)
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completeIfReady()
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||
}
|
||
|
||
private func cancel() {
|
||
guard !finished else { return }
|
||
cancelled = true
|
||
failure = CancellationError()
|
||
stop()
|
||
}
|
||
|
||
private func stop() {
|
||
closeStream(isStdout: true)
|
||
closeStream(isStdout: false)
|
||
if launched, !exited, process.isRunning {
|
||
process.terminate()
|
||
queue.asyncAfter(deadline: .now() + .milliseconds(250)) {
|
||
if !self.exited, self.process.isRunning {
|
||
Darwin.kill(self.process.processIdentifier, SIGKILL)
|
||
}
|
||
}
|
||
}
|
||
completeIfReady()
|
||
}
|
||
|
||
private func closeStream(isStdout: Bool) {
|
||
if isStdout {
|
||
guard !stdoutDone else { return }
|
||
stdoutDone = true
|
||
if let source = stdoutSource {
|
||
source.cancel()
|
||
stdoutSource = nil
|
||
} else {
|
||
try? stdoutPipe.fileHandleForReading.close()
|
||
}
|
||
} else {
|
||
guard !stderrDone else { return }
|
||
stderrDone = true
|
||
if let source = stderrSource {
|
||
source.cancel()
|
||
stderrSource = nil
|
||
} else {
|
||
try? stderrPipe.fileHandleForReading.close()
|
||
}
|
||
}
|
||
}
|
||
|
||
private func completeIfReady() {
|
||
guard !finished, continuation != nil, (!launched || exited), stdoutDone, stderrDone else { return }
|
||
if let failure {
|
||
finish(.failure(failure))
|
||
} else if process.terminationStatus != 0 {
|
||
finish(.failure(YouTubeResolver.extractionError(stderr, status: process.terminationStatus)))
|
||
} else {
|
||
finish(.success(YouTubeExtractionOutput(stdout: stdout, stderr: stderr)))
|
||
}
|
||
}
|
||
|
||
private func finish(_ result: Result<YouTubeExtractionOutput, any Error>) {
|
||
guard !finished else { return }
|
||
finished = true
|
||
process.terminationHandler = nil
|
||
closeStream(isStdout: true)
|
||
closeStream(isStdout: false)
|
||
try? stdoutPipe.fileHandleForWriting.close()
|
||
try? stderrPipe.fileHandleForWriting.close()
|
||
let completion = continuation
|
||
continuation = nil
|
||
completion?.resume(with: result)
|
||
}
|
||
}
|