QR Code Login Initial view state (#2667)

ElementX/Sources/Services/QRCode/QRCodeLoginController.swift

@@ -0,0 +1,37 @@
+//
+// Copyright 2024 New Vector Ltd
+//
+// Licensed 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 AVFoundation
+
+final class QRCodeLoginService: QRCodeLoginServiceProtocol {
+    func requestAuthorizationIfNeeded() async -> Bool {
+        let status = AVCaptureDevice.authorizationStatus(for: .video)
+        
+        // Determine if the user previously authorized camera access.
+        if status == .authorized {
+            return true
+        }
+        
+        var isAuthorized = false
+        // If the system hasn't determined the user's authorization status,
+        // explicitly prompt them for approval.
+        if status == .notDetermined {
+            isAuthorized = await AVCaptureDevice.requestAccess(for: .video)
+        }
+        
+        return isAuthorized
+    }
+}

ElementX/Sources/Services/QRCode/QRCodeLoginServiceProtocol.swift

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+//
+// Copyright 2024 New Vector Ltd
+//
+// Licensed 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.
+//
+
+// sourcery: AutoMockable
+protocol QRCodeLoginServiceProtocol {
+    func requestAuthorizationIfNeeded() async -> Bool
+}