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//
// API.swift
// Rocket.Chat
//
// Created by Matheus Cardoso on 9/18/17.
// Copyright © 2017 Rocket.Chat. All rights reserved.
//
import Foundation
import SwiftyJSON
protocol APIRequestMiddleware {
var api: API { get }
init(api: API)
func handle<R: APIRequest>(_ request: inout R) -> APIError?
}
protocol APIFetcher {
@discardableResult
func fetch<R: APIRequest>(_ request: R, completion: ((_ result: APIResponse<R.APIResourceType>) -> Void)?) -> URLSessionTask?
@discardableResult
func fetch<R: APIRequest>(_ request: R, options: APIRequestOptionSet, completion: ((_ result: APIResponse<R.APIResourceType>) -> Void)?) -> URLSessionTask?
@discardableResult
func fetch<R: APIRequest>(_ request: R, options: APIRequestOptionSet, sessionDelegate: URLSessionTaskDelegate?, completion: ((_ result: APIResponse<R.APIResourceType>) -> Void)?) -> URLSessionTask?
}
extension APIFetcher {
@discardableResult
func fetch<R: APIRequest>(_ request: R, completion: ((APIResponse<R.APIResourceType>) -> Void)?) -> URLSessionTask? {
return fetch(request, options: [], sessionDelegate: nil, completion: completion)
}
@discardableResult
func fetch<R: APIRequest>(_ request: R, options: APIRequestOptionSet, completion: ((_ result: APIResponse<R.APIResourceType>) -> Void)?) -> URLSessionTask? {
return fetch(request, options: options, sessionDelegate: nil, completion: completion)
}
}
typealias AnyAPIFetcher = Any & APIFetcher
final class API: APIFetcher {
let host: URL
let version: Version
var requestMiddlewares = [APIRequestMiddleware]()
var authToken: String?
var userId: String?
var language: String?
static let userAgent: String = {
let info = Bundle.main.infoDictionary
let appVersion = info?["CFBundleShortVersionString"] as? String ?? "Unknown"
let bundleVersion = info?["CFBundleVersion"] as? String ?? "-"
let systemVersion = UIDevice.current.systemVersion
return "RC Mobile; iOS \(systemVersion); v\(appVersion) (\(bundleVersion))"
}()
convenience init?(host: String, version: Version = .zero) {
guard let url = URL(string: host)?.httpServerURL() else {
return nil
}
self.init(host: url, version: version)
}
init(host: URL, version: Version = .zero) {
self.host = host
self.version = version
requestMiddlewares.append(VersionMiddleware(api: self))
}
@discardableResult
func fetch<R: APIRequest>(_ request: R, options: APIRequestOptionSet = [], sessionDelegate: URLSessionTaskDelegate? = nil,
completion: ((_ result: APIResponse<R.APIResourceType>) -> Void)?) -> URLSessionTask? {
var transformedRequest = request
for middleware in requestMiddlewares {
if let error = middleware.handle(&transformedRequest) {
completion?(.error(error))
return nil
}
}
guard let request = transformedRequest.request(for: self, options: options) else {
completion?(.error(.malformedRequest))
return nil
}
var session: URLSession = URLSession.shared
if let sessionDelegate = sessionDelegate {
let configuration = URLSessionConfiguration.ephemeral
configuration.timeoutIntervalForRequest = 30
session = URLSession(
configuration: configuration,
delegate: sessionDelegate,
delegateQueue: nil
)
}
#if DEBUG
var body = ""
if let data = transformedRequest.body() {
body = ": \(String(data: data, encoding: .utf8) ?? "")"
}
Log.debug("[REST][REQUEST]: \(request.url?.absoluteString ?? "")\(body)")
#endif
let task = session.dataTask(with: request) { (data, _, error) in
func completeWithResponse(_ response: APIResponse<R.APIResourceType>) {
switch response {
case .resource:
DispatchQueue.main.async {
completion?(response)
}
case .error:
if options.retries > 0 {
DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) {
self.fetch(
transformedRequest,
options: options.withRetries(options.retries - 1),
sessionDelegate: sessionDelegate,
completion: completion
)
}
} else {
DispatchQueue.main.async {
completion?(response)
}
}
}
}
if let error = error as NSError? {
#if DEBUG
Log.debug("[REST][RESULT][ERROR][\(request.url?.absoluteString ?? "")]: \(error)")
#endif
if NSError.sslErrors.contains(error.code) {
completeWithResponse(.error(.notSecured))
} else {
completeWithResponse(.error(.error(error)))
}
return
}
guard let data = data else {
#if DEBUG
Log.debug("[REST][RESULT][\(request.url?.absoluteString ?? "")]: No data.")
#endif
completion?(.error(.noData))
return
}
let json = try? JSON(data: data)
completeWithResponse(APIResponse<R.APIResourceType>.resource(R.APIResourceType(raw: json)))
#if DEBUG
Log.debug("[REST][RESULT][\(request.url?.absoluteString ?? "")]: \(json?.rawString() ?? "").")
#endif
}
task.resume()
return task
}
}