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| 1 | +// |
| 2 | +// NetworkManager.swift |
| 3 | +// |
| 4 | +// |
| 5 | +// Created by Steve Galbraith on 9/24/19. |
| 6 | +// |
| 7 | + |
| 8 | +import Foundation |
| 9 | +import RxSwift |
| 10 | + |
| 11 | +public final class NetworkManager: Network { |
| 12 | + typealias Header = [String : String] |
| 13 | + private let environment: NetworkEnvironment |
| 14 | + private let session: Session |
| 15 | + private let sessionCookieName: String |
| 16 | + private var authCookie: HTTPCookie? { |
| 17 | + didSet { |
| 18 | + if authCookie != nil { |
| 19 | + saveCookie() |
| 20 | + } else { |
| 21 | + guard let oldDomain = oldValue?.domain else { |
| 22 | + deleteCookie(for: nil) |
| 23 | + return |
| 24 | + } |
| 25 | + |
| 26 | + let url = URL(string: oldDomain) |
| 27 | + deleteCookie(for: url) |
| 28 | + } |
| 29 | + } |
| 30 | + } |
| 31 | + |
| 32 | + // MARK: - Initializer |
| 33 | + |
| 34 | + init(environment: NetworkEnvironment, session: Session, sessionCookieName: String = "") { |
| 35 | + self.environment = environment |
| 36 | + self.session = session |
| 37 | + self.sessionCookieName = sessionCookieName |
| 38 | + } |
| 39 | + |
| 40 | + // MARK: - Network |
| 41 | + |
| 42 | + public func request(method: HTTPMethod, endpoint: String, parameters: [String : Any]? = nil, headers: [String : String]? = nil) -> Observable<Result<Data, NetworkError>> { |
| 43 | + dataRequest(method: method, endpoint: endpoint, parameters: parameters, headers: defaultHeaders(headers)) |
| 44 | + } |
| 45 | + |
| 46 | + public func authenticatedRequest(method: HTTPMethod, endpoint: String, parameters: [String : Any]? = nil, headers: [String : String]? = nil) -> Observable<Result<Data, NetworkError>> { |
| 47 | + dataRequest(method: method, endpoint: endpoint, parameters: parameters, headers: authenticatedHeaders(headers), requiresAuthentication: true) |
| 48 | + } |
| 49 | + |
| 50 | + // MARK: - Helpers |
| 51 | + |
| 52 | + private func dataRequest(method: HTTPMethod, endpoint: String, parameters: [String : Any]?, headers: Header?, requiresAuthentication: Bool = false) -> Observable<Result<Data, NetworkError>> { |
| 53 | + guard let request = generateRequest(method: method, endpoint: endpoint, parameters: parameters, headers: headers) else { |
| 54 | + return Observable.error(NetworkError.unexpected) |
| 55 | + } |
| 56 | + let result = ReplaySubject<Result<Data, NetworkError>>.create(bufferSize: 1) |
| 57 | + let dataTask = session.dataTask(with: request as NSURLRequest) { [weak self] data, response, error in |
| 58 | + guard error == nil else { |
| 59 | + let message = error!.localizedDescription |
| 60 | + let apiError = NetworkError.failure(message: message) |
| 61 | + result.onNext(.failure(apiError)) |
| 62 | + return |
| 63 | + } |
| 64 | + |
| 65 | + guard let data = data else { |
| 66 | + let apiError: NetworkError = .failure(message: "Error: No data returned from network request") |
| 67 | + result.onNext(.failure(apiError)) |
| 68 | + return |
| 69 | + } |
| 70 | + |
| 71 | + if let httpURLResponse = response as? HTTPURLResponse { |
| 72 | + self?.setCookies(for: httpURLResponse.allHeaderFields) |
| 73 | + } |
| 74 | + |
| 75 | + result.onNext(.success(data)) |
| 76 | + } |
| 77 | + |
| 78 | + dataTask.resume() |
| 79 | + return result |
| 80 | + } |
| 81 | + |
| 82 | + private func generateRequest(method: HTTPMethod, endpoint: String, parameters: [String: Any]?, headers: [String: String]?) -> URLRequest? { |
| 83 | + guard let baseURL = URL(string: environment.url) else { return nil } |
| 84 | + |
| 85 | + var urlString = endpoint |
| 86 | + var httpBody: Data? = nil |
| 87 | + |
| 88 | + switch method { |
| 89 | + case .get: |
| 90 | + urlString += "?\(queryString(for: parameters))" |
| 91 | + case .post: |
| 92 | + httpBody = generateHTTPBody(from: parameters) |
| 93 | + default: |
| 94 | + break |
| 95 | + } |
| 96 | + guard let url = URL(string: urlString, relativeTo: baseURL) else { return nil } |
| 97 | + var request = URLRequest(url: url) |
| 98 | + request.httpBody = httpBody |
| 99 | + |
| 100 | + headers?.forEach({ (key, value) in |
| 101 | + request.setValue(value, forHTTPHeaderField: key) |
| 102 | + }) |
| 103 | + |
| 104 | + return request |
| 105 | + } |
| 106 | + |
| 107 | + private func queryString(for params: [String: Any]?) -> String { |
| 108 | + guard let parameters = params as? [String: String] else { return "" } |
| 109 | + |
| 110 | + var paramList = [String]() |
| 111 | + |
| 112 | + for (key, value) in parameters { |
| 113 | + guard let escapedKey = key.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed) else { |
| 114 | + print("Failed to convert key \(key)") |
| 115 | + continue |
| 116 | + } |
| 117 | + |
| 118 | + guard let escapedValue = (value as AnyObject).addingPercentEncoding(withAllowedCharacters: .urlHostAllowed) else { |
| 119 | + print("Failed to convert value \(value)") |
| 120 | + continue |
| 121 | + } |
| 122 | + |
| 123 | + paramList.append("\(escapedKey)=\(escapedValue)") |
| 124 | + } |
| 125 | + |
| 126 | + return paramList.joined(separator: "&") |
| 127 | + } |
| 128 | + |
| 129 | + private func generateHTTPBody(from params: [String: Any]?) -> Data? { |
| 130 | + guard let parameters = params else { return nil } |
| 131 | + return try? JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) |
| 132 | + } |
| 133 | + |
| 134 | + private func merge(_ optional: [String: Any]?, with base: [String: Any]) -> [String: Any] { |
| 135 | + guard let additions = optional else { |
| 136 | + return base |
| 137 | + } |
| 138 | + // If there's a conflict, take the new override |
| 139 | + return base.merging(additions) { (_, new) in new } |
| 140 | + } |
| 141 | + |
| 142 | + private func defaultHeaders(_ headers: [String: Any]?) -> Header { |
| 143 | + let defaultHeaders = [ |
| 144 | + "Accept" : "application/json" |
| 145 | + ] |
| 146 | + guard let merged = merge(headers, with: defaultHeaders) as? Header |
| 147 | + else { return defaultHeaders } |
| 148 | + |
| 149 | + return merged |
| 150 | + } |
| 151 | + |
| 152 | + private func authenticatedHeaders(_ headers: [String: String]?) -> Header { |
| 153 | + guard let cookie = authCookie else { return Header() } |
| 154 | + |
| 155 | + let headerDefaults = defaultHeaders(headers) |
| 156 | + let authHeader = HTTPCookie.requestHeaderFields(with: [cookie]) |
| 157 | + guard let merged = merge(headerDefaults, with: authHeader) as? Header |
| 158 | + else { |
| 159 | + return authHeader |
| 160 | + } |
| 161 | + |
| 162 | + return merged |
| 163 | + } |
| 164 | + |
| 165 | + private func setCookies(for headers: [AnyHashable : Any]) { |
| 166 | + guard |
| 167 | + let headerStrings = headers as? [String : String], |
| 168 | + let url = URL(string: environment.host) |
| 169 | + else { return } |
| 170 | + |
| 171 | + let allCookies = HTTPCookie.cookies(withResponseHeaderFields: headerStrings, for: url) |
| 172 | + |
| 173 | + guard let sessionCookie = allCookies.first(where: { $0.name == sessionCookieName }) else { return } |
| 174 | + authCookie = sessionCookie |
| 175 | + } |
| 176 | + |
| 177 | + private func saveCookie() { |
| 178 | + guard |
| 179 | + let cookie = authCookie, |
| 180 | + let url = URL(string: environment.host) |
| 181 | + else { return } |
| 182 | + |
| 183 | + let headerFields = HTTPCookie.requestHeaderFields(with: [cookie]) |
| 184 | + let cookies = HTTPCookie.cookies(withResponseHeaderFields: headerFields, for: url) |
| 185 | + HTTPCookieStorage.shared.setCookies(cookies, for: url, mainDocumentURL: url) |
| 186 | + } |
| 187 | + |
| 188 | + private func deleteCookie(with name: String? = nil, for url: URL?) { |
| 189 | + guard let cookieURL = url else { |
| 190 | + let components = DateComponents(month: -1) |
| 191 | + if let oneMonthAgo = Calendar.current.date(byAdding: components, to: Date()) { |
| 192 | + HTTPCookieStorage.shared.removeCookies(since: oneMonthAgo) |
| 193 | + } |
| 194 | + return |
| 195 | + } |
| 196 | + |
| 197 | + guard let cookies = HTTPCookieStorage.shared.cookies(for: cookieURL) else { return } |
| 198 | + |
| 199 | + guard let cookieName = name else { |
| 200 | + cookies.forEach { cookie in |
| 201 | + HTTPCookieStorage.shared.deleteCookie(cookie) |
| 202 | + } |
| 203 | + return |
| 204 | + } |
| 205 | + |
| 206 | + cookies.forEach { cookie in |
| 207 | + if cookie.name == cookieName { |
| 208 | + HTTPCookieStorage.shared.deleteCookie(cookie) |
| 209 | + } |
| 210 | + } |
| 211 | + } |
| 212 | +} |
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