233 lines
9.8 KiB
Swift
233 lines
9.8 KiB
Swift
// HTTPS + JSON calls to the WristCode gateway. docs/api.md lists every route.
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import Foundation
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enum GatewayError: LocalizedError, Equatable {
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/// 401: the device token is missing or revoked. The app shows the pairing screen.
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case unauthorized
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/// Any other non-2xx status, with the gateway's `{ "error": ... }` message when it sent one.
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case http(status: Int, message: String?)
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case transport(String)
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case decoding(String)
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var errorDescription: String? {
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switch self {
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case .unauthorized:
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"This watch is no longer paired."
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case let .http(status, message):
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message ?? Self.defaultMessage(status)
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case let .transport(message):
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message
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case let .decoding(message):
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"The gateway sent something unexpected. \(message)"
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}
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}
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/// True for 409, when the request was stale, such as an approval someone already answered.
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var isStale: Bool {
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if case .http(409, _) = self { return true }
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return false
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}
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private static func defaultMessage(_ status: Int) -> String {
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switch status {
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case 404: "Not found."
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case 409: "Already handled."
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case 429: "Too many attempts. Wait a minute."
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case 503: "That host is offline."
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default: "The gateway returned \(status)."
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}
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}
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}
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/// Everything the watch asks of a gateway. `GatewayClient` talks to the real one and `DemoGateway`
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/// serves fixtures, so every screen works without a live gateway.
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protocol GatewayAPI: Sendable {
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func feed() async throws -> Feed
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func summary() async throws -> Summary
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func thread(hostId: String, threadId: String) async throws -> ThreadDetail
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/// The page of messages before `cursor`, a thread's `earlierCursor` or the last page's.
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func history(hostId: String, threadId: String, cursor: String) async throws -> HistoryResponse
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func sendMessage(hostId: String, threadId: String, text: String) async throws
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func respond(hostId: String, threadId: String, request: RespondRequest) async throws
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func stop(hostId: String, threadId: String) async throws
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/// Settles a thread, as in T3. A settled thread that finished or failed leaves the feed.
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func settle(hostId: String, threadId: String) async throws
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/// Turns Ask before acting on or off for a thread.
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func setAskFirst(hostId: String, threadId: String, askFirst: Bool) async throws
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/// Every unsettled finished thread, including those past the feed's first 10.
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func recent() async throws -> RecentResponse
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/// Settles every completed thread in Recent. Failed threads stay.
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func settleRecent() async throws -> SettleRecentResponse
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func projects() async throws -> ProjectsResponse
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/// A project's newest 50 threads, settled ones included. Subagents are left out.
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func projectThreads(hostId: String, projectId: String) async throws -> ThreadListResponse
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/// Thread titles and messages on every online host matching `query`, which needs two characters.
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func search(_ query: String) async throws -> SearchResponse
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func newThread(_ request: NewThreadRequest) async throws -> NewThreadResponse
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func registerPush(_ registration: PushRegistration) async throws
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func status() async throws -> StatusResponse
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/// Connects the host again from its first route.
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func reconnect(hostId: String) async throws
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func testPush() async throws -> PushResult
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/// Turns one kind of push on or off for this watch, and returns all four switches.
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func setNotification(_ key: NotificationPrefs.Key, _ on: Bool) async throws -> NotificationPrefs
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/// Revokes this watch's device token.
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func unpair() async throws
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}
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struct GatewayClient: GatewayAPI {
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let baseURL: URL
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let token: String?
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var session: URLSession = .shared
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/// `POST /v1/pair`. The only call made without a device token.
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static func pair(baseURL: URL, code: String, deviceName: String) async throws -> PairResponse {
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let client = GatewayClient(baseURL: baseURL, token: nil)
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return try await client.call("POST", ["v1", "pair"], body: PairRequest(code: code, deviceName: deviceName))
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}
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func feed() async throws -> Feed {
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try await call("GET", ["v1", "feed"])
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}
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func summary() async throws -> Summary {
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try await call("GET", ["v1", "summary"])
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}
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func thread(hostId: String, threadId: String) async throws -> ThreadDetail {
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try await call("GET", ["v1", "threads", hostId, threadId])
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}
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func history(hostId: String, threadId: String, cursor: String) async throws -> HistoryResponse {
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try await call("GET", ["v1", "threads", hostId, threadId, "history"], query: [URLQueryItem(name: "cursor", value: cursor)])
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}
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func sendMessage(hostId: String, threadId: String, text: String) async throws {
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try await callIgnoringBody("POST", ["v1", "threads", hostId, threadId, "messages"], body: SendMessageRequest(text: text))
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}
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func respond(hostId: String, threadId: String, request: RespondRequest) async throws {
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try await callIgnoringBody("POST", ["v1", "threads", hostId, threadId, "respond"], body: request)
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}
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func stop(hostId: String, threadId: String) async throws {
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try await callIgnoringBody("POST", ["v1", "threads", hostId, threadId, "stop"], body: nil as SendMessageRequest?)
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}
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func settle(hostId: String, threadId: String) async throws {
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try await callIgnoringBody("POST", ["v1", "threads", hostId, threadId, "settle"], body: nil as SendMessageRequest?)
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}
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func setAskFirst(hostId: String, threadId: String, askFirst: Bool) async throws {
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try await callIgnoringBody("POST", ["v1", "threads", hostId, threadId, "mode"], body: ThreadModeRequest(askFirst: askFirst))
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}
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func recent() async throws -> RecentResponse {
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try await call("GET", ["v1", "recent"])
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}
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func settleRecent() async throws -> SettleRecentResponse {
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try await call("POST", ["v1", "recent", "settle"])
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}
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func projects() async throws -> ProjectsResponse {
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try await call("GET", ["v1", "projects"])
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}
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func projectThreads(hostId: String, projectId: String) async throws -> ThreadListResponse {
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try await call("GET", ["v1", "projects", hostId, projectId, "threads"])
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}
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func search(_ query: String) async throws -> SearchResponse {
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try await call("GET", ["v1", "search"], query: [URLQueryItem(name: "q", value: query)])
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}
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func newThread(_ request: NewThreadRequest) async throws -> NewThreadResponse {
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try await call("POST", ["v1", "threads"], body: request)
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}
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func registerPush(_ registration: PushRegistration) async throws {
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try await callIgnoringBody("PUT", ["v1", "device", "push"], body: registration)
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}
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func status() async throws -> StatusResponse {
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try await call("GET", ["v1", "status"])
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}
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func reconnect(hostId: String) async throws {
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try await callIgnoringBody("POST", ["v1", "hosts", hostId, "reconnect"], body: nil as SendMessageRequest?)
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}
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func testPush() async throws -> PushResult {
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try await call("POST", ["v1", "device", "test-push"])
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}
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func setNotification(_ key: NotificationPrefs.Key, _ on: Bool) async throws -> NotificationPrefs {
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try await call("PUT", ["v1", "device", "notifications"], body: [key.rawValue: on])
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}
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func unpair() async throws {
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try await callIgnoringBody("DELETE", ["v1", "device"], body: nil as SendMessageRequest?)
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}
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// MARK: - Plumbing
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private func call<Response: Decodable>(
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_ method: String, _ path: [String], query: [URLQueryItem] = []
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) async throws -> Response {
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try await call(method, path, query: query, body: nil as SendMessageRequest?)
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}
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private func call<Body: Encodable, Response: Decodable>(
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_ method: String, _ path: [String], query: [URLQueryItem] = [], body: Body?
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) async throws -> Response {
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let data = try await perform(method, path, query: query, body: body)
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do {
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return try JSON.decoder().decode(Response.self, from: data)
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} catch {
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throw GatewayError.decoding(String(describing: error))
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}
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}
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private func callIgnoringBody<Body: Encodable>(_ method: String, _ path: [String], body: Body?) async throws {
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_ = try await perform(method, path, body: body)
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}
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private func perform<Body: Encodable>(
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_ method: String, _ path: [String], query: [URLQueryItem] = [], body: Body?
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) async throws -> Data {
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// appending(component:) percent-encodes each segment, slashes included.
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var url = path.reduce(baseURL) { $0.appending(component: $1) }
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if !query.isEmpty { url.append(queryItems: query) }
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var request = URLRequest(url: url, timeoutInterval: 20)
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request.httpMethod = method
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request.setValue("application/json", forHTTPHeaderField: "Accept")
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if let token {
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request.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
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}
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if let body {
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request.setValue("application/json", forHTTPHeaderField: "Content-Type")
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request.httpBody = try JSON.encoder().encode(body)
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}
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let data: Data
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let response: URLResponse
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do {
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(data, response) = try await session.data(for: request)
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} catch let error as URLError {
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throw GatewayError.transport(error.localizedDescription)
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}
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guard let http = response as? HTTPURLResponse else {
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throw GatewayError.transport("No HTTP response.")
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}
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guard (200 ..< 300).contains(http.statusCode) else {
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if http.statusCode == 401 { throw GatewayError.unauthorized }
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let message = try? JSON.decoder().decode(ErrorResponse.self, from: data).error
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throw GatewayError.http(status: http.statusCode, message: message)
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}
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return data
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}
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}
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