279 lines
12 KiB
Swift
279 lines
12 KiB
Swift
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//Made by Lumaa
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import Combine
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import Foundation
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import Observation
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import os
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import SwiftUI
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@Observable
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public final class Client: Equatable, Identifiable, Hashable {
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public static func == (lhs: Client, rhs: Client) -> Bool {
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let lhsToken = lhs.critical.withLock { $0.oauthToken }
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let rhsToken = rhs.critical.withLock { $0.oauthToken }
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return (lhsToken != nil) == (rhsToken != nil) &&
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lhs.server == rhs.server &&
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lhsToken?.accessToken == rhsToken?.accessToken
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}
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public enum Version: String, Sendable {
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case v1, v2
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}
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public enum ClientError: Error {
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case unexpectedRequest
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}
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public enum OauthError: Error {
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case missingApp
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case invalidRedirectURL
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}
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public var id: String {
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critical.withLock {
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let isAuth = $0.oauthToken != nil
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return "\(isAuth)\(server)\($0.oauthToken?.createdAt ?? 0)"
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}
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}
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public func hash(into hasher: inout Hasher) {
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hasher.combine(id)
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}
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public let server: String
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public let version: Version
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private let urlSession: URLSession
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private let decoder = JSONDecoder()
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// Putting all mutable state inside an `OSAllocatedUnfairLock` makes `Client`
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// provably `Sendable`. The lock is a struct, but it uses a `ManagedBuffer`
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// reference type to hold its associated state.
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private let critical: OSAllocatedUnfairLock<Critical>
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private struct Critical: Sendable {
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/// Only used as a transitionary app while in the oauth flow.
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var oauthApp: InstanceApp?
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var oauthToken: OauthToken?
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var connections: Set<String> = []
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}
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public var isAuth: Bool {
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critical.withLock { $0.oauthToken != nil }
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}
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public var connections: Set<String> {
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critical.withLock { $0.connections }
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}
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public init(server: String, version: Version = .v1, oauthToken: OauthToken? = nil) {
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self.server = server
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self.version = version
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critical = .init(initialState: Critical(oauthToken: oauthToken, connections: [server]))
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urlSession = URLSession.shared
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decoder.keyDecodingStrategy = .convertFromSnakeCase
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}
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public func addConnections(_ connections: [String]) {
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critical.withLock {
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$0.connections.formUnion(connections)
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}
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}
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public func hasConnection(with url: URL) -> Bool {
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guard let host = url.host else { return false }
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return critical.withLock {
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if let rootHost = host.split(separator: ".", maxSplits: 1).last {
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// Sometimes the connection is with the root host instead of a subdomain
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// eg. Mastodon runs on mastdon.domain.com but the connection is with domain.com
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$0.connections.contains(host) || $0.connections.contains(String(rootHost))
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} else {
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$0.connections.contains(host)
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}
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}
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}
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private func makeURL(scheme: String = "https",
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endpoint: Endpoint,
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forceVersion: Version? = nil,
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forceServer: String? = nil) throws -> URL
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{
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var components = URLComponents()
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components.scheme = scheme
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components.host = forceServer ?? server
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if type(of: endpoint) == Oauth.self {
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components.path += "/\(endpoint.path())"
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} else {
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components.path += "/api/\(forceVersion?.rawValue ?? version.rawValue)/\(endpoint.path())"
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}
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components.queryItems = endpoint.queryItems()
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guard let url = components.url else {
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throw ClientError.unexpectedRequest
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}
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return url
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}
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private func makeURLRequest(url: URL, endpoint: Endpoint, httpMethod: String) -> URLRequest {
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var request = URLRequest(url: url)
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request.httpMethod = httpMethod
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if let oauthToken = critical.withLock({ $0.oauthToken }) {
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request.setValue("Bearer \(oauthToken.accessToken)", forHTTPHeaderField: "Authorization")
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}
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if let json = endpoint.jsonValue {
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let encoder = JSONEncoder()
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encoder.keyEncodingStrategy = .convertToSnakeCase
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encoder.outputFormatting = .sortedKeys
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do {
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let jsonData = try encoder.encode(json)
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request.httpBody = jsonData
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request.setValue("application/json", forHTTPHeaderField: "Content-Type")
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} catch {
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print("Client Error encoding JSON: \(error.localizedDescription)")
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}
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}
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return request
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}
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private func makeGet(endpoint: Endpoint) throws -> URLRequest {
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let url = try makeURL(endpoint: endpoint)
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return makeURLRequest(url: url, endpoint: endpoint, httpMethod: "GET")
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}
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public func get<Entity: Decodable>(endpoint: Endpoint, forceVersion: Version? = nil) async throws -> Entity {
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try await makeEntityRequest(endpoint: endpoint, method: "GET", forceVersion: forceVersion)
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}
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public func getWithLink<Entity: Decodable>(endpoint: Endpoint) async throws -> (Entity, LinkHandler?) {
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let (data, httpResponse) = try await urlSession.data(for: makeGet(endpoint: endpoint))
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var linkHandler: LinkHandler?
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if let response = httpResponse as? HTTPURLResponse,
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let link = response.allHeaderFields["Link"] as? String
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{
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linkHandler = .init(rawLink: link)
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}
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logResponseOnError(httpResponse: httpResponse, data: data)
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return try (decoder.decode(Entity.self, from: data), linkHandler)
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}
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public func post<Entity: Decodable>(endpoint: Endpoint, forceVersion: Version? = nil) async throws -> Entity {
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try await makeEntityRequest(endpoint: endpoint, method: "POST", forceVersion: forceVersion)
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}
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public func post(endpoint: Endpoint, forceVersion: Version? = nil) async throws -> HTTPURLResponse? {
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let url = try makeURL(endpoint: endpoint, forceVersion: forceVersion)
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let request = makeURLRequest(url: url, endpoint: endpoint, httpMethod: "POST")
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let (_, httpResponse) = try await urlSession.data(for: request)
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return httpResponse as? HTTPURLResponse
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}
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public func patch(endpoint: Endpoint) async throws -> HTTPURLResponse? {
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let url = try makeURL(endpoint: endpoint)
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let request = makeURLRequest(url: url, endpoint: endpoint, httpMethod: "PATCH")
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let (_, httpResponse) = try await urlSession.data(for: request)
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return httpResponse as? HTTPURLResponse
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}
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public func put<Entity: Decodable>(endpoint: Endpoint, forceVersion: Version? = nil) async throws -> Entity {
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try await makeEntityRequest(endpoint: endpoint, method: "PUT", forceVersion: forceVersion)
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}
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public func delete(endpoint: Endpoint, forceVersion: Version? = nil) async throws -> HTTPURLResponse? {
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let url = try makeURL(endpoint: endpoint, forceVersion: forceVersion)
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let request = makeURLRequest(url: url, endpoint: endpoint, httpMethod: "DELETE")
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let (_, httpResponse) = try await urlSession.data(for: request)
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return httpResponse as? HTTPURLResponse
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}
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private func makeEntityRequest<Entity: Decodable>(endpoint: Endpoint,
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method: String,
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forceVersion: Version? = nil) async throws -> Entity
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{
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let url = try makeURL(endpoint: endpoint, forceVersion: forceVersion)
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let request = makeURLRequest(url: url, endpoint: endpoint, httpMethod: method)
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let (data, httpResponse) = try await urlSession.data(for: request)
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logResponseOnError(httpResponse: httpResponse, data: data)
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do {
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return try decoder.decode(Entity.self, from: data)
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} catch {
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print(error)
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if var serverError = try? decoder.decode(ServerError.self, from: data) {
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if let httpResponse = httpResponse as? HTTPURLResponse {
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serverError.httpCode = httpResponse.statusCode
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}
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throw serverError
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}
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throw error
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}
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}
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public func oauthURL() async throws -> URL {
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let app: InstanceApp = try await post(endpoint: Apps.registerApp)
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critical.withLock { $0.oauthApp = app }
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return try makeURL(endpoint: Oauth.authorize(clientId: app.clientId))
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}
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public func continueOauthFlow(url: URL) async throws -> OauthToken {
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guard let app = critical.withLock({ $0.oauthApp }) else {
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throw OauthError.missingApp
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}
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guard let components = URLComponents(url: url, resolvingAgainstBaseURL: false),
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let code = components.queryItems?.first(where: { $0.name == "code" })?.value
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else {
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throw OauthError.invalidRedirectURL
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}
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let token: OauthToken = try await post(endpoint: Oauth.token(code: code,
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clientId: app.clientId,
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clientSecret: app.clientSecret))
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critical.withLock { $0.oauthToken = token }
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return token
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}
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public func makeWebSocketTask(endpoint: Endpoint, instanceStreamingURL: URL?) throws -> URLSessionWebSocketTask {
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let url = try makeURL(scheme: "wss", endpoint: endpoint, forceServer: instanceStreamingURL?.host)
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var subprotocols: [String] = []
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if let oauthToken = critical.withLock({ $0.oauthToken }) {
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subprotocols.append(oauthToken.accessToken)
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}
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return urlSession.webSocketTask(with: url, protocols: subprotocols)
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}
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public func mediaUpload<Entity: Decodable>(endpoint: Endpoint,
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version: Version,
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method: String,
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mimeType: String,
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filename: String,
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data: Data) async throws -> Entity
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{
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let url = try makeURL(endpoint: endpoint, forceVersion: version)
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var request = makeURLRequest(url: url, endpoint: endpoint, httpMethod: method)
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let boundary = UUID().uuidString
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request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
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let httpBody = NSMutableData()
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httpBody.append("--\(boundary)\r\n".data(using: .utf8)!)
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httpBody.append("Content-Disposition: form-data; name=\"\(filename)\"; filename=\"\(filename)\"\r\n".data(using: .utf8)!)
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httpBody.append("Content-Type: \(mimeType)\r\n".data(using: .utf8)!)
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httpBody.append("\r\n".data(using: .utf8)!)
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httpBody.append(data)
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httpBody.append("\r\n--\(boundary)--\r\n".data(using: .utf8)!)
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request.httpBody = httpBody as Data
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let (data, httpResponse) = try await urlSession.data(for: request)
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logResponseOnError(httpResponse: httpResponse, data: data)
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do {
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return try decoder.decode(Entity.self, from: data)
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} catch {
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if let serverError = try? decoder.decode(ServerError.self, from: data) {
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throw serverError
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}
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throw error
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}
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}
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private func logResponseOnError(httpResponse: URLResponse, data: Data) {
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if let httpResponse = httpResponse as? HTTPURLResponse, httpResponse.statusCode > 299 {
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print(httpResponse)
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print(String(data: data, encoding: .utf8) ?? "")
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}
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}
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}
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extension Client: Sendable {}
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