127 lines
4.5 KiB
Swift
127 lines
4.5 KiB
Swift
//
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// WebServices.swift
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// Passepartout
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//
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// Created by Davide De Rosa on 9/14/18.
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// Copyright (c) 2018 Davide De Rosa. All rights reserved.
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//
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// https://github.com/keeshux
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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 SwiftyBeaver
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private let log = SwiftyBeaver.self
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class WebServices {
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enum Endpoint {
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case network(Infrastructure.Name)
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var path: String {
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switch self {
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case .network(let name):
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return "net/\(name.webName).json"
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}
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}
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}
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struct Response<T> {
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let value: T?
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let lastModifiedString: String?
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var lastModified: Date? {
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guard let string = lastModifiedString else {
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return nil
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}
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return lmFormatter.date(from: string)
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}
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let isCached: Bool
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}
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static let shared = WebServices()
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private static let lmFormatter: DateFormatter = {
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let fmt = DateFormatter()
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fmt.timeZone = TimeZone(abbreviation: "GMT")
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fmt.dateFormat = "EEE, dd LLL yyyy HH:mm:ss zzz"
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return fmt
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}()
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func network(with name: Infrastructure.Name, ifModifiedSince lastModified: Date?, completionHandler: @escaping (Response<Infrastructure>?, Error?) -> Void) {
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var request = get(.network(name))
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if let lastModified = lastModified {
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request.addValue(WebServices.lmFormatter.string(from: lastModified), forHTTPHeaderField: "If-Modified-Since")
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}
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parse(Infrastructure.self, request: request, completionHandler: completionHandler)
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}
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private func get(_ endpoint: Endpoint) -> URLRequest {
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let url = AppConstants.Web.url(path: endpoint.path)
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return URLRequest(url: url, cachePolicy: .reloadIgnoringCacheData, timeoutInterval: AppConstants.Web.timeout)
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}
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private func parse<T: Decodable>(_ type: T.Type, request: URLRequest, completionHandler: @escaping (Response<T>?, Error?) -> Void) {
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log.debug("GET \(request.url!)")
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log.debug("Request headers: \(request.allHTTPHeaderFields?.description ?? "")")
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let session = URLSession(configuration: .default)
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session.dataTask(with: request) { (data, response, error) in
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guard let httpResponse = response as? HTTPURLResponse else {
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log.error("Error (response): \(error?.localizedDescription ?? "nil")")
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completionHandler(nil, error)
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return
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}
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let statusCode = httpResponse.statusCode
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log.debug("Response status: \(statusCode)")
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if let responseHeaders = httpResponse.allHeaderFields as? [String: String] {
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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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log.debug("Response is cached")
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completionHandler(Response(value: nil, lastModifiedString: nil, isCached: true), nil)
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return
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}
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// 200: cache miss
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let value: T
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let lastModifiedString: String?
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guard statusCode == 200, let data = data else {
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log.error("Error (network): \(error?.localizedDescription ?? "nil")")
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completionHandler(nil, error)
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return
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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 let e {
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log.error("Error (parsing): \(e)")
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completionHandler(nil, error)
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return
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}
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lastModifiedString = httpResponse.allHeaderFields["Last-Modified"] as? String
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let response = Response(value: value, lastModifiedString: lastModifiedString, isCached: false)
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completionHandler(response, nil)
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}.resume()
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}
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}
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