300 lines
15 KiB
Swift
300 lines
15 KiB
Swift
import Foundation
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private struct StreamResolutionError: 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 StreamURL: Sendable {
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case youtube(URL)
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case miruro(mediaID: String, episode: Int)
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static func parse(_ text: String) throws -> StreamURL {
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let text = text.trimmingCharacters(in: .whitespacesAndNewlines)
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let url = try YouTubeResolver.validateURL(text)
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if url.host?.lowercased() != "barelystarted.miruro.tv" { return .youtube(url) }
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let invalid = StreamResolutionError(message: "Enter a Miruro episode URL from barelystarted.miruro.tv with an explicit positive episode number.")
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guard !text.unicodeScalars.contains(where: {
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CharacterSet.whitespacesAndNewlines.contains($0) || CharacterSet.controlCharacters.contains($0)
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}), let components = URLComponents(string: text),
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components.scheme?.lowercased() == "https",
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components.host?.lowercased() == "barelystarted.miruro.tv",
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components.user == nil, components.password == nil,
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components.port == nil || components.port == 443,
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components.fragment == nil,
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components.percentEncodedPath == components.path,
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components.url != nil else { throw invalid }
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let path = components.path.split(separator: "/", omittingEmptySubsequences: false)
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guard path.count == 4, path[0].isEmpty, path[1] == "watch",
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!path[3].isEmpty, path[3].utf8.count <= 512,
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path[3].utf8.allSatisfy({ isSegmentByte($0) }),
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let query = components.queryItems, query.count == 1, query[0].name == "ep",
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let number = query[0].value, let episode = Int(number),
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components.percentEncodedQuery == "ep=\(episode)",
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ResolvedSource.validIdentity(mediaID: String(path[2]), episode: episode) else { throw invalid }
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return .miruro(mediaID: String(path[2]), episode: episode)
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}
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private static func isSegmentByte(_ byte: UInt8) -> Bool {
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(65...90).contains(byte) || (97...122).contains(byte) ||
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(48...57).contains(byte) || byte == 45 || byte == 95
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}
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}
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struct MiruroSelection: Sendable {
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let source: ResolvedSource
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let videoProvider: String
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let captionProvider: String?
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}
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struct MiruroSources: Sendable {
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fileprivate struct Candidate: Sendable {
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let provider: String
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let source: ResolvedSource
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}
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fileprivate let videos: [Candidate]
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fileprivate let captions: [Candidate]
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let videoProviders: [String]
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let captionProviders: [String]
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fileprivate init(videos: [Candidate], captions: [Candidate]) {
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self.videos = videos
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self.captions = captions
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videoProviders = videos.map(\.provider)
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captionProviders = captions.map(\.provider)
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}
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func select(videoProvider: String? = nil, captionProvider: String? = nil) throws -> MiruroSelection {
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guard let video = videos.first(where: { $0.provider == videoProvider }) ??
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videos.first(where: { $0.provider == "sun" }) ?? videos.first else {
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throw StreamResolutionError(message: "Direct Miruro Japanese source is unavailable.")
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}
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let caption = captions.first(where: { $0.provider == captionProvider }) ??
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captions.first(where: { $0.provider == video.provider }) ??
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captions.first(where: { $0.provider == "sun" }) ?? captions.first
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let source = ResolvedSource(url: video.source.url, headers: video.source.headers,
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identity: video.source.identity, title: video.source.title, subtitles: caption?.source.subtitles ?? [])
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return MiruroSelection(source: source, videoProvider: video.provider, captionProvider: caption?.provider)
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}
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}
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enum MiruroResolver {
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static let bodyLimit = 2 * 1024 * 1024
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static func resolve(mediaID: String, episode: Int) async throws -> MiruroSources {
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try Task.checkCancellation()
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guard ResolvedSource.validIdentity(mediaID: mediaID, episode: episode) else {
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throw StreamResolutionError(message: "Invalid Miruro episode identity.")
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}
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var components = URLComponents(string: "https://barelystarted.miruro.tv/api/sources")!
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components.queryItems = [URLQueryItem(name: "id", value: mediaID), URLQueryItem(name: "n", value: String(episode))]
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var request = URLRequest(url: components.url!)
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request.timeoutInterval = 25
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request.setValue("application/json", forHTTPHeaderField: "Accept")
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let configuration = URLSessionConfiguration.ephemeral
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configuration.timeoutIntervalForRequest = 25
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configuration.timeoutIntervalForResource = 25
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configuration.httpShouldSetCookies = false
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configuration.httpCookieStorage = nil
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configuration.urlCache = nil
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let session = URLSession(configuration: configuration, delegate: MiruroRedirectPolicy(), delegateQueue: nil)
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defer { session.invalidateAndCancel() }
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do {
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let (bytes, response) = try await session.bytes(for: request)
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try validateResponse(response)
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var data = Data()
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if response.expectedContentLength > 0 { data.reserveCapacity(Int(response.expectedContentLength)) }
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for try await byte in bytes {
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try Task.checkCancellation()
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guard data.count < bodyLimit else {
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throw StreamResolutionError(message: "Miruro source response exceeded 2 MiB.")
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}
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data.append(byte)
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}
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try Task.checkCancellation()
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return try decode(data, mediaID: mediaID, episode: episode)
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} catch {
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if Task.isCancelled || error is CancellationError || (error as? URLError)?.code == .cancelled {
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throw CancellationError()
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}
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if let error = error as? StreamResolutionError { throw error }
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throw StreamResolutionError(message: "Miruro request failed or timed out. No retry was attempted.")
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}
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}
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static func validateResponse(_ response: URLResponse) throws {
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guard let response = response as? HTTPURLResponse else {
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throw StreamResolutionError(message: "Miruro returned an invalid HTTP response.")
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}
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guard response.statusCode == 200 else {
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throw StreamResolutionError(message: "Miruro HTTP \(response.statusCode). No retry was attempted.")
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}
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guard response.mimeType?.lowercased() == "application/json" else {
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throw StreamResolutionError(message: "Miruro returned an unexpected content type; protection pages are not supported.")
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}
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guard response.expectedContentLength <= Int64(bodyLimit) else {
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throw StreamResolutionError(message: "Miruro source response exceeded 2 MiB.")
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}
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}
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static func decode(_ data: Data, mediaID: String, episode: Int) throws -> MiruroSources {
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do {
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guard data.count <= bodyLimit,
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ResolvedSource.validIdentity(mediaID: mediaID, episode: episode) else { throw InvalidProjection() }
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let response = try JSONDecoder().decode(Sources.self, from: data)
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guard response.episodeNumber == episode else { throw InvalidProjection() }
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var videos: [MiruroSources.Candidate] = []
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var captions: [MiruroSources.Candidate] = []
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var videoNames = Set<String>()
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var captionNames = Set<String>()
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// Japanese variants only, preferring soft subtitles independently for each provider.
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for variant in ["ssub", "sub"] {
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for track in response.tracks.lazy.compactMap(\.value) where track.track == variant {
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for provider in track.providers.lazy.compactMap(\.value) {
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let name = provider.provider
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guard validProviderName(name), let config = response.config[name]?.value,
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config.player == "native", !config.proxy,
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config.hls?.segments?.enabled != true, config.hls?.query?.enabled != true else { continue }
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let needsVideo = !videoNames.contains(name)
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let needsCaptions = !captionNames.contains(name)
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guard needsVideo || needsCaptions else { continue }
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for server in provider.servers.lazy.compactMap(\.value) where !server.hasEmbed {
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let headers = server.headers ?? [:]
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var found = false
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for stream in server.streams.lazy.compactMap(\.value) {
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guard !stream.hasEmbed,
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["hls", "m3u8", "application/vnd.apple.mpegurl", "application/x-mpegurl"].contains(stream.format),
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let video = try? ResolvedSource.validated(.init(version: 1, url: stream.url,
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headers: headers, identity: .init(provider: "miruro", media_id: mediaID, episode: episode),
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title: nil, subtitles: [])) else { continue }
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if videoNames.insert(name).inserted {
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videos.append(.init(provider: name, source: video))
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}
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// Caption requests retain this provider/server's headers, never the selected video's.
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let subtitles = provider.subtitles.lazy.compactMap(\.value).filter { $0.format == "vtt" }.map {
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ResolvedSubtitle(url: $0.file, format: $0.format, language: $0.language,
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label: $0.label, isDefault: $0.default, headers: headers)
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}
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if needsCaptions, !subtitles.isEmpty,
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let caption = try? ResolvedSource.validated(.init(version: 1, url: stream.url,
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headers: headers, identity: .init(provider: "miruro", media_id: mediaID, episode: episode),
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title: nil, subtitles: Array(subtitles))) {
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captions.append(.init(provider: name, source: caption))
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captionNames.insert(name)
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}
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found = true
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break
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}
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if found { break }
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}
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}
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}
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}
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// API order is advisory; retain response order for names omitted from it.
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let order = response.providerOrder ?? []
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func ordered(_ candidates: [MiruroSources.Candidate]) -> [MiruroSources.Candidate] {
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var remaining = Dictionary(uniqueKeysWithValues: candidates.map { ($0.provider, $0) })
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var result: [MiruroSources.Candidate] = []
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for name in order {
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if let candidate = remaining.removeValue(forKey: name) { result.append(candidate) }
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}
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result.append(contentsOf: candidates.filter { remaining[$0.provider] != nil })
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return result
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}
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let sources = MiruroSources(videos: ordered(videos), captions: ordered(captions))
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_ = try sources.select()
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return sources
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} catch {
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if let error = error as? StreamResolutionError { throw error }
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throw StreamResolutionError(message: "Miruro returned invalid or unsupported source metadata.")
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}
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}
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private static func validProviderName(_ name: String) -> Bool {
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!name.isEmpty && name.utf8.count <= 128 && name.utf8.allSatisfy {
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(65...90).contains($0) || (97...122).contains($0) || (48...57).contains($0) || $0 == 45 || $0 == 95
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}
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}
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private struct InvalidProjection: Error {}
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// A malformed entry must not discard valid neighboring providers, servers or streams.
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private struct Entry<Value: Decodable>: Decodable {
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let value: Value?
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init(from decoder: Decoder) throws { value = try? Value(from: decoder) }
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}
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private struct Sources: Decodable {
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let episodeNumber: Int
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let tracks: [Entry<Track>]
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let config: [String: Entry<ProviderConfig>]
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let providerOrder: [String]?
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}
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private struct ProviderConfig: Decodable {
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let player: String
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// Objects describe proxy work this native player cannot perform.
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let proxy: Bool
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let hls: HLS?
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}
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private struct HLS: Decodable {
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struct Rule: Decodable { let enabled: Bool? }
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let segments: Rule?
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let query: Rule?
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}
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private struct Track: Decodable {
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let track: String
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let providers: [Entry<Provider>]
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}
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private struct Provider: Decodable {
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let provider: String
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let servers: [Entry<Server>]
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let subtitles: [Entry<Subtitle>]
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}
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private struct Server: Decodable {
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let headers: [String: String]?
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let streams: [Entry<Stream>]
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let hasEmbed: Bool
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enum CodingKeys: String, CodingKey { case headers, streams, embed }
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init(from decoder: Decoder) throws {
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let values = try decoder.container(keyedBy: CodingKeys.self)
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headers = try values.decodeIfPresent([String: String].self, forKey: .headers)
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streams = try values.decode([Entry<Stream>].self, forKey: .streams)
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if values.contains(.embed) {
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hasEmbed = try !values.decodeNil(forKey: .embed)
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} else {
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hasEmbed = false
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}
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}
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}
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private struct Stream: Decodable {
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let url: String
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let format: String
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let hasEmbed: Bool
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enum CodingKeys: String, CodingKey { case url, format, embed }
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init(from decoder: Decoder) throws {
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let values = try decoder.container(keyedBy: CodingKeys.self)
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url = try values.decode(String.self, forKey: .url)
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format = try values.decode(String.self, forKey: .format)
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if values.contains(.embed) {
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hasEmbed = try !values.decodeNil(forKey: .embed)
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} else {
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hasEmbed = false
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}
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}
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}
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private struct Subtitle: Decodable {
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let file: String
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let format: String
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let language: String
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let label: String
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let `default`: Bool
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}
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}
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private final class MiruroRedirectPolicy: NSObject, URLSessionTaskDelegate, @unchecked Sendable {
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func urlSession(_ session: URLSession, task: URLSessionTask,
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willPerformHTTPRedirection response: HTTPURLResponse, newRequest request: URLRequest,
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completionHandler: @escaping (URLRequest?) -> Void) {
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completionHandler(nil)
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}
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}
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