142 lines
4.7 KiB
Swift
142 lines
4.7 KiB
Swift
import Foundation
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/// 网络请求封装 - 对应 Android 版 OkGo
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class NetworkManager {
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static let shared = NetworkManager()
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private static let fallbackCharsetNames: [String] = [
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"utf-8",
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"gb18030",
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"gbk",
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"gb2312",
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"utf-16",
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"utf-16le",
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"utf-16be",
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"utf-32",
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"windows-1252",
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"iso-8859-1"
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]
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private static let fallbackStringEncodings: [String.Encoding] = [
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.utf8,
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.utf16,
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.utf16LittleEndian,
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.utf16BigEndian,
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.utf32,
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.utf32LittleEndian,
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.utf32BigEndian,
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.windowsCP1252,
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.isoLatin1
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]
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private let session: URLSession
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private let decoder = JSONDecoder()
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private init() {
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let config = URLSessionConfiguration.default
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config.timeoutIntervalForRequest = 15
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config.timeoutIntervalForResource = 30
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config.httpMaximumConnectionsPerHost = 5
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self.session = URLSession(configuration: config)
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}
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/// GET 请求获取字符串
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func getString(from urlString: String, headers: [String: String]? = nil) async throws -> String {
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guard let url = URL(string: urlString.trimmingCharacters(in: .whitespacesAndNewlines)) else {
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throw NetworkError.invalidURL(urlString)
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}
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var request = URLRequest(url: url)
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request.httpMethod = "GET"
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headers?.forEach { request.setValue($1, forHTTPHeaderField: $0) }
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let (data, response) = try await session.data(for: request)
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guard let httpResponse = response as? HTTPURLResponse else {
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throw NetworkError.invalidResponse
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}
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guard (200...299).contains(httpResponse.statusCode) else {
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throw NetworkError.httpError(httpResponse.statusCode)
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}
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guard let str = Self.decodeString(data: data, response: httpResponse) else {
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throw NetworkError.decodingError("文本解码失败")
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}
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return str
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}
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/// GET 请求解码 JSON
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func getJSON<T: Decodable>(from urlString: String, type: T.Type, headers: [String: String]? = nil) async throws -> T {
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let str = try await getString(from: urlString, headers: headers)
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guard let data = str.data(using: .utf8) else {
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throw NetworkError.decodingError("字符串转 Data 失败")
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}
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return try decoder.decode(T.self, from: data)
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}
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/// GET 请求获取原始 Data
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func getData(from urlString: String) async throws -> Data {
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guard let url = URL(string: urlString.trimmingCharacters(in: .whitespacesAndNewlines)) else {
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throw NetworkError.invalidURL(urlString)
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}
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let (data, _) = try await session.data(from: url)
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return data
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}
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private static func decodeString(data: Data, response: HTTPURLResponse) -> String? {
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// 优先使用服务端声明的字符集（如 gbk / gb2312 / gb18030）
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if let charset = response.textEncodingName,
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let declaredEncoding = encoding(fromIANACharset: charset),
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let value = String(data: data, encoding: declaredEncoding) {
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return value
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}
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for charset in fallbackCharsetNames {
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if let encoding = encoding(fromIANACharset: charset),
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let value = String(data: data, encoding: encoding) {
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return value
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}
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}
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for encoding in fallbackStringEncodings {
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if let value = String(data: data, encoding: encoding) {
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return value
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}
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}
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// 最后兜底，避免单纯因编码不一致直接报错
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if !data.isEmpty {
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return String(decoding: data, as: UTF8.self)
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}
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return nil
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}
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private static func encoding(fromIANACharset charset: String) -> String.Encoding? {
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let cfEncoding = CFStringConvertIANACharSetNameToEncoding(charset as CFString)
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guard cfEncoding != kCFStringEncodingInvalidId else {
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return nil
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}
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let nsEncoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding)
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return String.Encoding(rawValue: nsEncoding)
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}
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}
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enum NetworkError: LocalizedError {
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case invalidURL(String)
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case invalidResponse
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case httpError(Int)
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case decodingError(String)
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var errorDescription: String? {
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switch self {
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case .invalidURL(let url): return "无效的URL: \(url)"
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case .invalidResponse: return "无效的响应"
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case .httpError(let code): return "HTTP 错误: \(code)"
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case .decodingError(let msg): return "解码错误: \(msg)"
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}
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}
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}
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