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Merge pull request #52 from boostcampwm-2024/feat/#51-http-api
[FEAT/#51] :: HTTP API를 추상화합니다.
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‎PhotoGether/DataLayer/PhotoGetherNetwork/PhotoGetherNetwork/APIError.swift‎

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import Foundation
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public enum APIError: Error {
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case unknown
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case custom(message: String = "알 수 없는 오류가 발생하였습니다", code: Int = 999)
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case timeout
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case decodingError(DecodingError)
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case badRequest // 400번대 오류
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case unauthorized // 401 Unauthorized
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case forbidden // 403 Forbidden
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case notFound // 404 Not Found
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case serverError // 500번대 오류
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}
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extension APIError: LocalizedError {
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public var errorDescription: String? {
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switch self {
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case .unknown:
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return "알 수 없는 오류가 발생하였습니다."
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case let .custom(message, _):
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return message
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case .timeout:
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return "타임 아웃 에러입니다."
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case let .decodingError(error):
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return error.fullDescription
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case .badRequest:
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return "잘못된 요청입니다."
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case .unauthorized:
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return "인증 오류입니다."
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case .forbidden:
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return "권한 없음입니다."
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case .notFound:
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return "요청한 것을 찾을 수 없습니다."
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case .serverError:
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return "서버 오류입니다."
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}
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}
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}
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extension Error {
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public var asAPIError: APIError {
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if let decodingError = self.asDecodingError {
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return APIError.decodingError(decodingError)
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} else if let urlError = self.asURLError, urlError.code == .timedOut {
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return APIError.timeout
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} else {
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return self as? APIError ?? .unknown
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}
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}
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var asDecodingError: DecodingError? {
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return self as? DecodingError
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}
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var asURLError: URLError? {
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return self as? URLError
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}
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}
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extension DecodingError {
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var fullDescription: String {
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switch self {
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case let .typeMismatch(type, context):
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return """
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타입이 맞지 않습니다.\n
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\(type) 타입에서 오류 발생:\n
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codingPath: \(context.codingPath)\n
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debugDescription: \(context.debugDescription)\n
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underlyingError: \(context.underlyingError?.localizedDescription ?? "none")
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"""
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case let .valueNotFound(type, context):
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return """
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값을 찾을 수 없습니다.\n
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\(type) 타입에서 오류 발생:\n
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codingPath: \(context.codingPath)\n
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debugDescription: \(context.debugDescription)\n
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underlyingError: \(context.underlyingError?.localizedDescription ?? "none")
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"""
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case let .keyNotFound(key, context):
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return """
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키 \(key) 를 찾을 수 없습니다:\n
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codingPath: \(context.codingPath)\n
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debugDescription: \(context.debugDescription)\n
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underlyingError: \(context.underlyingError?.localizedDescription ?? "none")
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"""
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case let .dataCorrupted(context):
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return """
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데이터 손실 에러입니다.\n
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codingPath: \(context.codingPath)\n
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debugDescription: \(context.debugDescription)\n
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underlyingError: \(context.underlyingError?.localizedDescription ?? "none")
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"""
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default:
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return "알 수 없는 디코딩에 실패했습니다."
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}
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}
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}

‎PhotoGether/DataLayer/PhotoGetherNetwork/PhotoGetherNetwork/EndPoint.swift‎

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import Foundation
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public enum HTTPMethod: String {
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case get = "GET"
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}
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public protocol EndPoint {
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var baseURL: URL { get }
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var path: String { get }
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var method: HTTPMethod { get }
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var parameters: [String: Any]? { get }
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var headers: [String: String]? { get }
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var body: Encodable? { get }
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}
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extension EndPoint {
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public func request() -> URLRequest {
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var url = baseURL.appendingPathComponent(path)
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var urlComponents = URLComponents(url: url, resolvingAgainstBaseURL: false)!
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urlComponents.queryItems = parameters?.map { URLQueryItem(name: $0.key, value: "\($0.value)") }
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url = urlComponents.url!
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var request = URLRequest(url: url)
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request.httpMethod = method.rawValue
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headers?.forEach {
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request.setValue($0.value, forHTTPHeaderField: $0.key)
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}
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if let body, let jsonData = try? JSONEncoder().encode(body) {
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request.httpBody = jsonData
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}
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request.cachePolicy = .reloadIgnoringLocalCacheData
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return request
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}
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}

‎PhotoGether/DataLayer/PhotoGetherNetwork/PhotoGetherNetwork/Request.swift‎

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import Foundation
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import Combine
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public enum Request {
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public static func requestJSON<E: EndPoint, T: Decodable>(
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_ endPoint: E,
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decoder: JSONDecoder = .init(),
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queue: DispatchQueue = .main
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) -> AnyPublisher<T, any Error> {
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decoder.dateDecodingStrategy = .iso8601
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return URLSession.shared.dataTaskPublisher(for: endPoint.request())
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.timeout(.seconds(10), scheduler: RunLoop.main)
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.map { output in
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printNetworkLog(request: endPoint.request(), output: output)
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}
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.tryMap(responseToData)
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.decode(type: T.self, decoder: decoder)
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.mapError(\.asAPIError)
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.receive(on: queue)
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.eraseToAnyPublisher()
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}
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public static func requestVoid<E: EndPoint>(
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_ endPoint: E,
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queue: DispatchQueue = .main
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) -> AnyPublisher<Void, any Error> {
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return URLSession.shared.dataTaskPublisher(for: endPoint.request())
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.timeout(.seconds(10), scheduler: RunLoop.main)
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.map { output in
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printNetworkLog(request: endPoint.request(), output: output)
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}
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.tryMap(responseToData)
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.map { _ in () }
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.mapError(\.asAPIError)
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.receive(on: queue)
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.eraseToAnyPublisher()
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}
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}
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private extension Request {
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static func responseToData(_ output: URLSession.DataTaskPublisher.Output) throws -> Data {
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guard let httpResponse = output.response as? HTTPURLResponse else {
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throw APIError.custom(message: "응답이 없습니다.", code: 999)
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}
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switch httpResponse.statusCode {
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case 200...299:
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return output.data
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case 400:
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throw APIError.badRequest
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case 401:
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throw APIError.unauthorized
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case 403:
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throw APIError.forbidden
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case 404:
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throw APIError.notFound
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case 500...599:
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throw APIError.serverError
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default:
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throw APIError.unknown
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}
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}
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static func printNetworkLog(request: URLRequest, output: URLSession.DataTaskPublisher.Output) -> URLSession.DataTaskPublisher.Output {
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// Request 정보 출력
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let method = request.httpMethod ?? "unknown method"
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let url = request.url?.absoluteString ?? "Unknown URL"
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print("====================\n\n[\(method)] \(url)\n\n====================\n")
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print("====================[ Request Headers ]====================\n")
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if let headers = request.allHTTPHeaderFields {
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print("\(headers)")
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} else {
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print("header를 찾을 수 없습니다.")
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}
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print("\n====================[ End Request Headers ]====================\n")
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// Request Body 출력
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print("\n====================[ Request Body ]====================\n")
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if let body = request.httpBody, let bodyString = String(data: body, encoding: .utf8) {
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print("\(bodyString)")
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} else {
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print("Unable to encode utf8")
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}
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print("\n====================[ End Request Body ]====================\n")
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// Response 정보 출력
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let httpResponse = output.response as? HTTPURLResponse
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let statusCode = httpResponse?.statusCode ?? -1
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print("====================\n\n[\(statusCode)]\n[\(url)]\n\n====================\n")
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// Response Body 출력
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print("\n====================[ Response Body ]====================\n")
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if let bodyString = String(data: output.data, encoding: .utf8) {
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print("\(bodyString)")
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} else {
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print("Unable to encode utf8")
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}
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print("\n====================[ End Body ]====================\n")
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return output
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}
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}

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