123 lines
4.5 KiB
Swift
123 lines
4.5 KiB
Swift
//
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// GenericWebServices.swift
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// Passepartout
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//
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// Created by Davide De Rosa on 11/20/19.
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// Copyright (c) 2022 Davide De Rosa. All rights reserved.
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//
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// https://github.com/passepartoutvpn
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//
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// This file is part of Passepartout.
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//
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// Passepartout is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Passepartout is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Passepartout. If not, see <http://www.gnu.org/licenses/>.
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//
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import Foundation
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import Combine
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public protocol GenericWebServicesError: Error {
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static func httpStatus(_ status: Int) -> Self
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static var unknown: Self { get }
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}
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public class GenericWebServices<ErrorType: GenericWebServicesError> {
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private let version: String?
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private let root: URL
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private let timeout: TimeInterval?
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public init(_ version: String?, _ root: URL, timeout: TimeInterval?) {
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self.version = version
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self.root = root
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self.timeout = timeout
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}
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public func get(_ endpoint: GenericWebEndpoint) -> URLRequest {
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var request = URLRequest(url: url(forEndpoint: endpoint), cachePolicy: .reloadIgnoringCacheData)
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if let timeout = timeout {
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request.timeoutInterval = timeout
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}
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return request
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}
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public func parse<T: Decodable>(_ type: T.Type, request: URLRequest) -> AnyPublisher<GenericWebResponse<T>, Error> {
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pp_log.debug("GET \(request.url!)")
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pp_log.debug("Request headers: \(request.allHTTPHeaderFields?.description ?? "none")")
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let session = URLSession(configuration: .ephemeral)
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return session.dataTaskPublisher(for: request)
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.handleEvents(receiveCompletion: { result in
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switch result {
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case .failure(let error):
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pp_log.error("Error (response): \(error.localizedDescription)")
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default:
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break
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}
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}).tryMap { (output: (Data, URLResponse)) in
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let data = output.0
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let response = output.1
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let value: T
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var lastModifiedString: String?
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if let httpResponse = response as? HTTPURLResponse {
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let statusCode = httpResponse.statusCode
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pp_log.debug("Response status: \(statusCode)")
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if let responseHeaders = httpResponse.allHeaderFields as? [String: String] {
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pp_log.debug("Response headers: \(responseHeaders)")
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}
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// 304: cache hit
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if statusCode == 304 {
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pp_log.debug("Response is cached")
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return GenericWebResponse(value: nil, lastModifiedString: nil, isCached: true)
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}
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// 200: cache miss
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guard statusCode == 200 else {
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pp_log.error("Error (HTTP): \(statusCode)")
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throw ErrorType.httpStatus(statusCode)
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}
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lastModifiedString = httpResponse.allHeaderFields["Last-Modified"] as? String
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} else {
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lastModifiedString = GenericWebParser.lastModifiedString(ofFileURL: request.url!)
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}
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if let lastModifiedString = lastModifiedString {
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pp_log.debug("Last modified: \(lastModifiedString)")
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}
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do {
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value = try JSONDecoder().decode(type, from: data)
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} catch {
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pp_log.error("Error (parsing): \(error)")
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throw error
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}
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return GenericWebResponse(value: value, lastModifiedString: lastModifiedString, isCached: false)
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}.eraseToAnyPublisher()
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}
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private func url(forEndpoint endpoint: GenericWebEndpoint) -> URL {
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guard let version = version else {
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return root.appendingPathComponent(endpoint.path)
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}
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return root.appendingPathComponent("\(version)/\(endpoint.path)")
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}
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}
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