添加网络层并接入 v9 登录流程及单元测试
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264
suixinkan/Core/Networking/APIClient.swift
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264
suixinkan/Core/Networking/APIClient.swift
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//
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// APIClient.swift
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// suixinkan
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//
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import Foundation
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/// URLSession 抽象协议，用于让网络客户端支持测试替身。
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protocol URLSessionProtocol {
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/// 发起 URLRequest 并返回原始数据和响应。
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func data(for request: URLRequest) async throws -> (Data, URLResponse)
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}
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extension URLSession: URLSessionProtocol {}
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@MainActor
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/// 统一网络请求客户端，负责构造请求、注入 token、校验响应和解析业务 Envelope。
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final class APIClient {
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private let session: URLSessionProtocol
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private let encoder: JSONEncoder
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private let decoder: JSONDecoder
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private var authTokenProvider: (() -> String?)?
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private let environment: APIEnvironment
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private let appVersion: String
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private let osType: String
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/// 初始化网络客户端及其编码、解码和环境配置。
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init(
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environment: APIEnvironment = .current,
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session: URLSessionProtocol = APIClient.defaultSession,
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encoder: JSONEncoder = JSONEncoder(),
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decoder: JSONDecoder = JSONDecoder(),
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appVersion: String = AppClientInfo.appVersion(),
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osType: String = AppClientInfo.osType
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) {
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self.environment = environment
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self.session = session
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self.encoder = encoder
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self.decoder = decoder
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self.appVersion = appVersion.trimmingCharacters(in: .whitespacesAndNewlines).nonEmpty ?? "1.0.0"
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self.osType = osType.trimmingCharacters(in: .whitespacesAndNewlines).nonEmpty ?? AppClientInfo.osType
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}
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nonisolated private static let defaultSession: URLSession = {
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let configuration = URLSessionConfiguration.default
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configuration.timeoutIntervalForRequest = 12
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configuration.timeoutIntervalForResource = 20
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configuration.waitsForConnectivity = false
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return URLSession(configuration: configuration)
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}()
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/// 绑定 token 提供者，让业务 API 不需要直接持有登录状态。
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func bindAuthTokenProvider(_ provider: @escaping () -> String?) {
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authTokenProvider = provider
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}
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/// 发送强类型 APIRequest，并返回解包后的业务数据。
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func send<Response: Decodable>(
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_ apiRequest: APIRequest<Response>,
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tokenOverride: String? = nil
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) async throws -> Response {
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let request = try makeURLRequest(apiRequest, tokenOverride: tokenOverride)
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logRequest(request)
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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 is CancellationError {
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logCancelled(for: request, reason: "CancellationError")
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throw CancellationError()
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} catch let error as URLError {
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if error.code == .cancelled {
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logCancelled(for: request, reason: "URLError.cancelled")
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throw CancellationError()
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}
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throw APIError.networkFailed(networkErrorMessage(for: error))
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} catch {
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throw APIError.networkFailed(error.localizedDescription)
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}
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logResponse(for: request, response: response, data: data)
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do {
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try validateHTTPResponse(response, data: data)
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return try decodeEnvelope(Response.self, from: data)
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} catch let error as APIError {
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notifySessionExpiredIfNeeded(for: error)
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throw error
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}
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}
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/// 将业务请求模型转换为 URLRequest，并注入公共 Header、token 和请求体。
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private func makeURLRequest<Response: Decodable>(
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_ apiRequest: APIRequest<Response>,
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tokenOverride: String?
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) throws -> URLRequest {
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let path = apiRequest.path.hasPrefix("/") ? apiRequest.path : "/" + apiRequest.path
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guard var components = URLComponents(
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string: environment.baseURL.absoluteString.trimmingCharacters(in: CharacterSet(charactersIn: "/")) + path
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) else {
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throw APIError.invalidURL
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}
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if !apiRequest.queryItems.isEmpty {
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components.queryItems = apiRequest.queryItems
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}
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guard let url = components.url else {
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throw APIError.invalidURL
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}
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var request = URLRequest(url: url)
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request.httpMethod = apiRequest.method.rawValue
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request.setValue("application/json", forHTTPHeaderField: "Content-Type")
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request.setValue("application/json", forHTTPHeaderField: "Accept")
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request.setValue(appVersion, forHTTPHeaderField: "X-APP-VERSION")
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request.setValue(osType, forHTTPHeaderField: "X-OS-TYPE")
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apiRequest.headers.forEach { key, value in
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request.setValue(value, forHTTPHeaderField: key)
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}
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let token = tokenOverride ?? authTokenProvider?()
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if let token = token?.trimmingCharacters(in: .whitespacesAndNewlines), !token.isEmpty {
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request.setValue(token, forHTTPHeaderField: "token")
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}
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if let body = apiRequest.body {
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request.httpBody = try encoder.encode(body)
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}
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return request
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}
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/// 校验 HTTP 层响应状态码，非 2xx 时提取错误信息。
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private func validateHTTPResponse(_ response: URLResponse, data: Data) throws {
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guard let httpResponse = response as? HTTPURLResponse else {
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throw APIError.invalidResponse
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}
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guard 200 ..< 300 ~= httpResponse.statusCode else {
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throw APIError.httpStatus(httpResponse.statusCode, parseHTTPErrorMessage(data: data))
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}
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}
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/// 解码后端统一 Envelope，并返回内部 data 数据。
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private func decodeEnvelope<Response: Decodable>(_ responseType: Response.Type, from data: Data) throws -> Response {
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let envelope: APIEnvelope<Response>
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do {
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envelope = try decoder.decode(APIEnvelope<Response>.self, from: data)
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} catch {
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throw APIError.decodeFailed(error.localizedDescription)
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}
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guard envelope.isSuccess else {
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throw APIError.serverCode(envelope.code, envelope.msg ?? "业务请求失败")
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}
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if responseType == EmptyPayload.self {
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return EmptyPayload() as! Response
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}
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guard let payload = envelope.data else {
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throw APIError.emptyData
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}
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return payload
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}
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/// Token 失效时广播 sessionDidExpire，触发全局登出。
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private func notifySessionExpiredIfNeeded(for error: APIError) {
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guard APIError.isAuthenticationExpired(error) else { return }
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NotificationCenter.default.post(name: NotificationName.sessionDidExpire, object: nil)
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}
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/// 从 HTTP 错误响应中提取更适合展示给用户的错误信息。
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private func parseHTTPErrorMessage(data: Data) -> String {
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if let envelope = try? decoder.decode(ErrorEnvelope.self, from: data) {
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if let msg = envelope.msg?.trimmingCharacters(in: .whitespacesAndNewlines), !msg.isEmpty {
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return msg
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}
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if let message = envelope.message?.trimmingCharacters(in: .whitespacesAndNewlines), !message.isEmpty {
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return message
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}
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if let error = envelope.error?.trimmingCharacters(in: .whitespacesAndNewlines), !error.isEmpty {
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return error
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}
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}
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if let plainText = String(data: data, encoding: .utf8)?
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.trimmingCharacters(in: .whitespacesAndNewlines),
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!plainText.isEmpty {
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return plainText.count > 120 ? String(plainText.prefix(120)) + "..." : plainText
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}
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return "服务端返回错误"
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}
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/// 将 URLError 转换成中文网络错误提示。
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private func networkErrorMessage(for error: URLError) -> String {
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switch error.code {
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case .timedOut:
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"请求超时，请稍后重试"
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case .notConnectedToInternet:
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"网络不可用，请检查网络连接"
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case .networkConnectionLost:
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"网络连接中断，请重试"
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case .cannotFindHost, .cannotConnectToHost, .dnsLookupFailed:
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"无法连接服务器，请稍后重试"
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default:
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error.localizedDescription
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}
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}
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/// 在 Debug 环境打印请求信息。
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private func logRequest(_ request: URLRequest) {
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#if DEBUG
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let method = request.httpMethod ?? "REQUEST"
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let url = request.url?.absoluteString ?? "<invalid url>"
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print("[API][Request] \(method) \(url)")
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#endif
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}
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/// 在 Debug 环境打印响应状态和响应体。
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private func logResponse(for request: URLRequest, response: URLResponse, data: Data) {
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#if DEBUG
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let method = request.httpMethod ?? "REQUEST"
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let url = request.url?.absoluteString ?? "<invalid url>"
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let statusCode = (response as? HTTPURLResponse).map { String($0.statusCode) } ?? "unknown"
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let body = Self.debugResponseBody(from: data)
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print("[API][Response] \(method) \(url) status=\(statusCode)\n\(body)")
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#endif
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}
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/// 在 Debug 环境打印被取消的请求信息。
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private func logCancelled(for request: URLRequest, reason: String) {
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#if DEBUG
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let method = request.httpMethod ?? "REQUEST"
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let url = request.url?.absoluteString ?? "<invalid url>"
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print("[API][Cancelled] \(method) \(url) reason=\(reason)")
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#endif
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}
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#if DEBUG
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/// 将响应体格式化为便于调试阅读的字符串。
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private static func debugResponseBody(from data: Data) -> String {
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guard !data.isEmpty else { return "<empty response>" }
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if
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let object = try? JSONSerialization.jsonObject(with: data),
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let prettyData = try? JSONSerialization.data(withJSONObject: object, options: [.prettyPrinted, .sortedKeys]),
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let prettyJSON = String(data: prettyData, encoding: .utf8) {
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return prettyJSON
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}
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return String(data: data, encoding: .utf8) ?? "<non-utf8 response: \(data.count) bytes>"
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}
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#endif
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}
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private extension String {
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var nonEmpty: String? {
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isEmpty ? nil : self
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}
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}
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