jthomas opened a new issue #12: Swift SDK does not support self-signed server certificates. URL: https://github.com/apache/incubator-openwhisk-runtime-swift/issues/12 Local instances of the platform use a self-signed SSL certificate. The Swift SDK (`_Whisk.swift`) fails when invoked against platform endpoints without a valid SSL certificate. The JavaScript SDK supports a constructor argument to turn off certificat checking to resolve this issue. **Looking into implementing this behaviour for the Swift SDK, I have discovered a blocking issue due to the lack of support in the open-source Swift Foundation libraries.** In Swift, certificate checking can be turned off by creating a new `URLSessionDelegate` with always trusts the server. ```swift class SessionDelegate:NSObject, URLSessionDelegate { func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) { let credential = URLCredential(trust: challenge.protectionSpace.serverTrust!) completionHandler(URLSession.AuthChallengeDisposition.useCredential, credential) } } ``` This can be used when creating the `URLSession` to use based upon a method parameter. ```swift let session = ignoreCerts ? URLSession(configuration: .default, delegate: SessionDelegate(), delegateQueue: nil) : URLSession(configuration: URLSessionConfiguration.default) ``` This works on OS X but compiling the code on Linux, I ran into the following issue. ``` _Whisky.swift:25:39: error: incorrect argument label in call (have 'trust:', expected 'coder:') let credential = URLCredential(trust: challenge.protectionSpace.serverTrust!) ^~~~~~ coder root@3a4fde570648:/source# swift -v Swift version 4.0 (swift-4.0-RELEASE) Target: x86_64-unknown-linux-gnu ``` Looking into the source code for the Swift foundation core libraries, I discovered this method has not been implemented. https://github.com/apple/swift-corelibs-foundation/blob/master/Foundation/URLCredential.swift#L155 ``` // TODO: We have no implementation for Security.framework primitive types SecIdentity and SecTrust yet ``` Talking to the IBM@Swift team, support for this feature is being worked on but won't be available until Swift 5 at the earliest. Until then, we will have to document the behaviour and wait for the foundation libraries to catch up. I've attached the completed `_Whisk.swift` demonstrating the bug. ```swift /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import Foundation import Dispatch class SessionDelegate:NSObject, URLSessionDelegate { func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) { let credential = URLCredential(trust: challenge.protectionSpace.serverTrust!) completionHandler(URLSession.AuthChallengeDisposition.useCredential, credential) } } class Whisk { static var baseUrl = ProcessInfo.processInfo.environment["__OW_API_HOST"] static var apiKey = ProcessInfo.processInfo.environment["__OW_API_KEY"] class func invoke(actionNamed action : String, withParameters params : [String:Any], ignoreCerts: Bool = false, blocking: Bool = true) -> [String:Any] { let parsedAction = parseQualifiedName(name: action) let strBlocking = blocking ? "true" : "false" let path = "/api/v1/namespaces/\(parsedAction.namespace)/actions/\(parsedAction.name)?blocking=\(strBlocking)" return sendWhiskRequestSyncronish(uriPath: path, params: params, method: "POST", ignoreCerts: ignoreCerts) } class func trigger(eventNamed event : String, ignoreCerts: Bool = false, withParameters params : [String:Any]) -> [String:Any] { let parsedEvent = parseQualifiedName(name: event) let path = "/api/v1/namespaces/\(parsedEvent.namespace)/triggers/\(parsedEvent.name)?blocking=true" return sendWhiskRequestSyncronish(uriPath: path, params: params, method: "POST", ignoreCerts: ignoreCerts) } class func createTrigger(triggerNamed trigger: String, ignoreCerts: Bool = false, withParameters params : [String:Any]) -> [String:Any] { let parsedTrigger = parseQualifiedName(name: trigger) let path = "/api/v1/namespaces/\(parsedTrigger.namespace)/triggers/\(parsedTrigger.name)" return sendWhiskRequestSyncronish(uriPath: path, params: params, method: "PUT", ignoreCerts: ignoreCerts) } class func createRule(ruleNamed ruleName: String, withTrigger triggerName: String, andAction actionName: String, ignoreCerts: Bool = false) -> [String:Any] { let parsedRule = parseQualifiedName(name: ruleName) let path = "/api/v1/namespaces/\(parsedRule.namespace)/rules/\(parsedRule.name)" let params = ["trigger":triggerName, "action":actionName] return sendWhiskRequestSyncronish(uriPath: path, params: params, method: "PUT", ignoreCerts: ignoreCerts) } // handle the GCD dance to make the post async, but then obtain/return // the result from this function sync private class func sendWhiskRequestSyncronish(uriPath path: String, params : [String:Any], method: String, ignoreCerts: Bool) -> [String:Any] { var response : [String:Any]! let queue = DispatchQueue.global() let invokeGroup = DispatchGroup() invokeGroup.enter() queue.async { postUrlSession(uriPath: path, ignoreCerts: ignoreCerts, params: params, method: method, group: invokeGroup) { result in response = result } } // On one hand, FOREVER seems like an awfully long time... // But on the other hand, I think we can rely on the system to kill this // if it exceeds a reasonable execution time. switch invokeGroup.wait(timeout: DispatchTime.distantFuture) { case DispatchTimeoutResult.success: break case DispatchTimeoutResult.timedOut: break } return response } /** * Using new UrlSession */ private class func postUrlSession(uriPath: String, ignoreCerts: Bool, params : [String:Any], method: String,group: DispatchGroup, callback : @escaping([String:Any]) -> Void) { guard let encodedPath = uriPath.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed) else { callback(["error": "Error encoding uri path to make openwhisk REST call."]) return } let urlStr = "\(baseUrl!)\(encodedPath)" if let url = URL(string: urlStr) { var request = URLRequest(url: url) request.httpMethod = method do { request.addValue("application/json", forHTTPHeaderField: "Content-Type") request.httpBody = try JSONSerialization.data(withJSONObject: params) let loginData: Data = apiKey!.data(using: String.Encoding.utf8, allowLossyConversion: false)! let base64EncodedAuthKey = loginData.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0)) request.addValue("Basic \(base64EncodedAuthKey)", forHTTPHeaderField: "Authorization") let session = ignoreCerts ? URLSession(configuration: .default, delegate: SessionDelegate(), delegateQueue: nil) : URLSession(configuration: URLSessionConfiguration.default) let task = session.dataTask(with: request, completionHandler: {data, response, error -> Void in // exit group after we are done defer { group.leave() } if let error = error { callback(["error":error.localizedDescription]) } else { if let data = data { do { //let outputStr = String(data: data, encoding: String.Encoding.utf8) as String! //print(outputStr) let respJson = try JSONSerialization.jsonObject(with: data) if respJson is [String:Any] { callback(respJson as! [String:Any]) } else { callback(["error":" response from server is not a dictionary"]) } } catch { callback(["error":"Error creating json from response: \(error)"]) } } } }) task.resume() } catch { callback(["error":"Got error creating params body: \(error)"]) } } } // separate an OpenWhisk qualified name (e.g. "/whisk.system/samples/date") // into namespace and name components private class func parseQualifiedName(name qualifiedName : String) -> (namespace : String, name : String) { let defaultNamespace = "_" let delimiter = "/" let segments :[String] = qualifiedName.components(separatedBy: delimiter) if segments.count > 2 { return (segments[1], Array(segments[2..<segments.count]).joined(separator: delimiter)) } else if segments.count == 2 { // case "/action" or "package/action" let name = qualifiedName.hasPrefix(delimiter) ? segments[1] : segments.joined(separator: delimiter) return (defaultNamespace, name) } else { return (defaultNamespace, segments[0]) } } } ```
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