mirror of https://github.com/oxen-io/session-ios
Added LokiSnodeProxy
Mikunj
5 years ago
parent
920520077d
commit
54c2e793ed
@ -1 +1 @@
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Subproject commit 80b9ef94d107a4c2794164537da30eb4482af49a
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Subproject commit 69d7254eda0f6422c98ce7a3d70a14e7a49ea1c5
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@ -0,0 +1,51 @@
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import PromiseKit
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internal class LokiHttpClient {
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enum HttpError: LocalizedError {
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/// Wraps TSNetworkManager failure callback params in a single throwable error
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case networkError(code: Int, response: Any?, underlyingError: Error?)
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public var errorDescription: String? {
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switch self {
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case .networkError(let code, let body, let underlingError): return underlingError?.localizedDescription ?? "Failed network request with code: \(code) \(body ?? "")"
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}
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}
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}
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func perform(_ request: TSRequest, withCompletionQueue queue: DispatchQueue = DispatchQueue.main) -> Promise<Any> {
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return TSNetworkManager.shared().perform(request, withCompletionQueue: queue).map { $0.responseObject }.recover { error -> Promise<Any> in
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throw LokiHttpClient.HttpError.from(error: error) ?? error
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}
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}
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}
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extension LokiHttpClient.HttpError {
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static func from(error: Error) -> LokiHttpClient.HttpError? {
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if let error = error as? NetworkManagerError {
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if case NetworkManagerError.taskError(_, let underlyingError) = error, let nsError = underlyingError as? NSError {
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var response = nsError.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey]
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if let data = response as? Data, let json = try? JSONSerialization.jsonObject(with: data, options: []) as? JSON {
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response = json
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}
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return LokiHttpClient.HttpError.networkError(code: error.statusCode, response: response, underlyingError: underlyingError)
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}
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return LokiHttpClient.HttpError.networkError(code: error.statusCode, response: nil, underlyingError: nil)
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}
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return nil
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}
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var isNetworkError: Bool {
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switch self {
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case .networkError(_, _, let underlyingError):
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return underlyingError != nil && IsNSErrorNetworkFailure(underlyingError)
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}
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return false
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}
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var statusCode: Int {
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switch self {
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case .networkError(let code, _, _):
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return code
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}
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}
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}
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@ -0,0 +1,154 @@
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import PromiseKit
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internal class LokiSnodeProxy: LokiHttpClient {
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internal let target: LokiAPITarget
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internal enum Error : LocalizedError {
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case invalidPublicKeys
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case failedToEncryptRequest
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case failedToParseProxyResponse
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case targetNodeHttpError(code: Int, message: Any?)
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public var errorDescription: String? {
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switch self {
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case .invalidPublicKeys: return "Invalid target public key"
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case .failedToEncryptRequest: return "Failed to encrypt request"
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case .failedToParseProxyResponse: return "Failed to parse proxy response"
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case .targetNodeHttpError(let code, let message): return "Target node returned error \(code) - \(message ?? "No message provided")"
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}
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}
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}
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// MARK: - Http
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private var sessionManager: AFHTTPSessionManager = {
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let manager = AFHTTPSessionManager(sessionConfiguration: URLSessionConfiguration.ephemeral)
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let securityPolicy = AFSecurityPolicy.default()
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securityPolicy.allowInvalidCertificates = true
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securityPolicy.validatesDomainName = false
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manager.securityPolicy = securityPolicy
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manager.responseSerializer = AFHTTPResponseSerializer()
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return manager
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}()
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// MARK: - Ephemeral key
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private var _kp: ECKeyPair
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private var _lastGenerated: TimeInterval
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private let keyPairRefreshTime: TimeInterval = 3 * 60 * 1000 // 3 minutes
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// MARK: - Class functions
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init(target: LokiAPITarget) {
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self.target = target
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_kp = Curve25519.generateKeyPair()
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_lastGenerated = Date().timeIntervalSince1970
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super.init()
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}
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private func getKeyPair() -> ECKeyPair {
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if (Date().timeIntervalSince1970 > _lastGenerated + keyPairRefreshTime) {
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_kp = Curve25519.generateKeyPair()
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_lastGenerated = Date().timeIntervalSince1970
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}
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return _kp
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}
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override func perform(_ request: TSRequest, withCompletionQueue queue: DispatchQueue = DispatchQueue.main) -> Promise<Any> {
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guard let targetHexEncodedPublicKeys = target.publicKeys else {
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return Promise(error: Error.invalidPublicKeys)
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}
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let keyPair = getKeyPair()
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guard let symmetricKey = try? Curve25519.generateSharedSecret(fromPublicKey: Data(hex: targetHexEncodedPublicKeys.encryption), privateKey: keyPair.privateKey) else {
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return Promise(error: Error.failedToEncryptRequest)
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}
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return LokiAPI.getRandomSnode().then { snode -> Promise<Any> in
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let url = "\(snode.address):\(snode.port)/proxy"
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print("[Loki][Snode proxy] Proxy request to \(self.target) via \(snode).")
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var peepee = request.parameters
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let jsonBodyData = try JSONSerialization.data(withJSONObject: peepee, options: [])
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let jsonBodyString = String(bytes: jsonBodyData, encoding: .utf8)
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let params: [String : Any] = [ "method" : request.httpMethod, "body" : jsonBodyString, "headers" : self.getHeaders(request: request) ]
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let jsonParams = try JSONSerialization.data(withJSONObject: params, options: [])
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let ivAndCipherText = try DiffieHellman.encrypt(jsonParams, using: symmetricKey)
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let headers = [ "X-Sender-Public-Key" : keyPair.publicKey.hexadecimalString, "X-Target-Snode-Key" : targetHexEncodedPublicKeys.identification]
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return self.post(url: url, body: ivAndCipherText, headers: headers, timeoutInterval: request.timeoutInterval)
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}.map { response in
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guard response is Data, let cipherText = Data(base64Encoded: response as! Data) else {
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print("[Loki][Snode proxy] Received non-string response")
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return response
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}
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let decrypted = try DiffieHellman.decrypt(cipherText, using: symmetricKey)
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// Unwrap and handle errors if needed
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guard let json = try? JSONSerialization.jsonObject(with: decrypted, options: .allowFragments) as? [String: Any], let code = json["status"] as? Int else {
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throw HttpError.networkError(code: -1, response: nil, underlyingError: Error.failedToParseProxyResponse)
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}
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let success = (200..<300).contains(code)
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var body: Any? = nil
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if let string = json["body"] as? String {
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if let jsonBody = try? JSONSerialization.jsonObject(with: string.data(using: .utf8)!, options: .allowFragments) as? [String: Any] {
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body = jsonBody
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} else {
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body = string
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}
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}
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if (!success) {
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throw HttpError.networkError(code: code, response: body, underlyingError: Error.targetNodeHttpError(code: code, message: body))
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}
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return body
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}.recover { error -> Promise<Any> in
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print("[Loki][Snode proxy] Failed proxy request. \(error.localizedDescription)")
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throw HttpError.from(error: error) ?? error
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}
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}
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private func getHeaders(request: TSRequest) -> [String: Any] {
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guard let headers = request.allHTTPHeaderFields else {
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return [:]
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}
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var newHeaders: [String: Any] = [:]
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for header in headers {
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var value: Any = header.value
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// We need to convert any string boolean values to actual boolean values
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if (header.value.lowercased() == "true" || header.value.lowercased() == "false") {
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value = NSString(string: header.value).boolValue
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}
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newHeaders[header.key] = value
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}
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return newHeaders
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}
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private func post(url: String, body: Data?, headers: [String: String]?, timeoutInterval: TimeInterval) -> Promise<Any> {
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let (promise, resolver) = Promise<Any>.pending()
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let request = AFHTTPRequestSerializer().request(withMethod: "POST", urlString: url, parameters: nil, error: nil)
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request.allHTTPHeaderFields = headers
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request.httpBody = body
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request.timeoutInterval = timeoutInterval
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var task: URLSessionDataTask? = nil
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task = sessionManager.dataTask(with: request as URLRequest) { (response, result, error) in
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if let error = error {
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if let task = task {
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let nmError = NetworkManagerError.taskError(task: task, underlyingError: error)
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let nsError: NSError = nmError as NSError
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nsError.isRetryable = false
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resolver.reject(nsError)
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} else {
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resolver.reject(error)
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}
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} else {
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OutageDetection.shared.reportConnectionSuccess()
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resolver.fulfill(result)
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}
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}
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task?.resume()
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return promise
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}
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}
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