feat: Implement one time login qr code

Signed-off-by: Marcel Müller <marcel-mueller@gmx.de>

Author: SystemKeeper

NextcloudTalk/LoginViewController.swift

@@ -353,4 +353,20 @@ class LoginViewController: UIViewController, UITextFieldDelegate, CCCertificateD
         NCSettingsController.sharedInstance().addNewAccount(forUser: user, withToken: password, inServer: serverURL)
         delegate?.loginViewControllerDidFinish()
     }
+
+    func qrScanner(_ scanner: QRScannerViewController, didScanNextcloudOnetimeLogin serverURL: String, user: String, onetimeToken: String) {
+        // We received a onetime login token and need to convert it to a permanent one. The token only allows to retrieve a permanent one, no other routes allowed
+        NCAPIController.sharedInstance().getAppPasswordOnetime(forServer: serverURL, withUsername: user, andOnetimeToken: onetimeToken) { [weak self] permanentAppToken in
+            guard let permanentAppToken else {
+                self?.showAlert(
+                    title: NSLocalizedString("Could not login with QR code", comment: ""),
+                    message: NSLocalizedString("The token might be used already or is expired. Please generate a new QR code and retry.", comment: ""))
+
+                return
+            }
+
+            NCSettingsController.sharedInstance().addNewAccount(forUser: user, withToken: permanentAppToken, inServer: serverURL)
+            self?.delegate?.loginViewControllerDidFinish()
+        }
+    }
 }

NextcloudTalk/NCAPIControllerExtensions.swift

@@ -1274,4 +1274,32 @@ import NextcloudKit
             completionBlock(thread)
         }
     }
+
+    // MARK: - Core
+
+    @nonobjc
+    func getAppPasswordOnetime(forServer server: String, withUsername username: String, andOnetimeToken onetimeToken: String, completionBlock: @escaping (_ permanentAppToken: String?) -> Void) {
+        let appPasswordRoute = "\(server)/ocs/v2.php/core/getapppassword-onetime"
+
+        let credentialsString = "\(username):\(onetimeToken)"
+        let authHeader = "Basic \(credentialsString.data(using: .utf8)!.base64EncodedString())"
+
+        let configuration = URLSessionConfiguration.default
+        let apiSessionManager = NCAPISessionManager(configuration: configuration)
+        apiSessionManager.requestSerializer.setValue(authHeader, forHTTPHeaderField: "Authorization")
+
+        _ = apiSessionManager.get(appPasswordRoute, parameters: nil, progress: nil) { _, result in
+            if let resultDict = result as? [String: AnyObject],
+               let ocs = resultDict["ocs"] as? [String: AnyObject],
+               let data = ocs["data"] as? [String: AnyObject],
+               let apppassword = data["apppassword"] as? String {
+
+                completionBlock(apppassword)
+            }
+
+            completionBlock(nil)
+        } failure: { _, _ in
+            completionBlock(nil)
+        }
+    }
 }

NextcloudTalk/QRScannerViewController.swift

@@ -8,6 +8,7 @@ import VisionKit
 
 @objc protocol QRScannerViewControllerDelegate: AnyObject {
     func qrScanner(_ scanner: QRScannerViewController, didScanNextcloudLogin serverURL: String, user: String, password: String)
+    func qrScanner(_ scanner: QRScannerViewController, didScanNextcloudOnetimeLogin serverURL: String, user: String, onetimeToken: String)
 }
 
 @objcMembers
@@ -137,7 +138,10 @@ class QRScannerViewController: UIViewController, DataScannerViewControllerDelega
         guard case let .barcode(barcode) = item,
               let value = barcode.payloadStringValue else { return }
 
-        if let urlComponents = NSURLComponents(string: value), var path = urlComponents.path, urlComponents.scheme == "nc", urlComponents.host == "login" {
+        if let urlComponents = NSURLComponents(string: value), var path = urlComponents.path, urlComponents.scheme == "nc" {
+            let isOnetimeLogin = (urlComponents.host == "onetime-login")
+            guard urlComponents.host == "login" || isOnetimeLogin else { return }
+
             if path.starts(with: "/") {
                 path.removeFirst()
             }
@@ -152,7 +156,12 @@ class QRScannerViewController: UIViewController, DataScannerViewControllerDelega
 
                     scannerViewController?.stopScanning()
                     self.dismiss(animated: true)
-                    self.delegate?.qrScanner(self, didScanNextcloudLogin: serverUrl, user: user, password: password)
+
+                    if isOnetimeLogin {
+                        self.delegate?.qrScanner(self, didScanNextcloudOnetimeLogin: serverUrl, user: user, onetimeToken: password)
+                    } else {
+                        self.delegate?.qrScanner(self, didScanNextcloudLogin: serverUrl, user: user, password: password)
+                    }
 
                     return
                 }