Detect username QR codes in our camera-first capture flow.

app/src/main/java/org/thoughtcrime/securesms/DeviceActivity.java

@@ -3,6 +3,7 @@ package org.thoughtcrime.securesms;
 import android.Manifest;
 import android.annotation.SuppressLint;
 import android.content.Context;
+import android.content.Intent;
 import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Bundle;
@@ -48,6 +49,8 @@ public class DeviceActivity extends PassphraseRequiredActivity
 
   private static final String TAG = Log.tag(DeviceActivity.class);
 
+  private static final String EXTRA_DIRECT_TO_SCANNER = "add";
+
   private final DynamicTheme    dynamicTheme    = new DynamicNoActionBarTheme();
   private final DynamicLanguage dynamicLanguage = new DynamicLanguage();
 
@@ -56,6 +59,13 @@ public class DeviceActivity extends PassphraseRequiredActivity
   private DeviceLinkFragment deviceLinkFragment;
   private MenuItem           cameraSwitchItem = null;
 
+
+  public static Intent getIntentForScanner(Context context) {
+    Intent intent = new Intent(context, DeviceActivity.class);
+    intent.putExtra(EXTRA_DIRECT_TO_SCANNER, true);
+    return intent;
+  }
+
   @Override
   public void onPreCreate() {
     dynamicTheme.onCreate(this);
@@ -79,7 +89,7 @@ public class DeviceActivity extends PassphraseRequiredActivity
     this.deviceListFragment.setAddDeviceButtonListener(this);
     this.deviceAddFragment.setScanListener(this);
 
-    if (getIntent().getBooleanExtra("add", false)) {
+    if (getIntent().getBooleanExtra(EXTRA_DIRECT_TO_SCANNER, false)) {
       initFragment(R.id.fragment_container, deviceAddFragment, dynamicLanguage.getCurrentLocale());
     } else {
       initFragment(R.id.fragment_container, deviceListFragment, dynamicLanguage.getCurrentLocale());

app/src/main/java/org/thoughtcrime/securesms/DeviceProvisioningActivity.java

@@ -26,9 +26,7 @@ public class DeviceProvisioningActivity extends PassphraseRequiredActivity {
         .setTitle(getString(R.string.DeviceProvisioningActivity_link_a_signal_device))
         .setMessage(getString(R.string.DeviceProvisioningActivity_it_looks_like_youre_trying_to_link_a_signal_device_using_a_3rd_party_scanner))
         .setPositiveButton(R.string.DeviceProvisioningActivity_continue, (dialog1, which) -> {
-          Intent intent = new Intent(DeviceProvisioningActivity.this, DeviceActivity.class);
-          intent.putExtra("add", true);
-          startActivity(intent);
+          startActivity(DeviceActivity.getIntentForScanner(this));
           finish();
         })
         .setNegativeButton(android.R.string.cancel, (dialog12, which) -> {

app/src/main/java/org/thoughtcrime/securesms/mediasend/AvatarSelectionActivity.java

@@ -181,18 +181,20 @@ public class AvatarSelectionActivity extends AppCompatActivity implements Camera
 
   @Override
   public void onMainImageLoaded() {
-
   }
 
   @Override
   public void onMainImageFailedToLoad() {
-
   }
 
   @Override
   public void restoreState() {
   }
 
+  @Override
+  public void onQrCodeFound(@NonNull String data) {
+  }
+
   public boolean popToRoot() {
     final int backStackCount = getSupportFragmentManager().getBackStackEntryCount();
     if (backStackCount == 0) {

app/src/main/java/org/thoughtcrime/securesms/mediasend/CameraFragment.java

@@ -22,9 +22,9 @@ public interface CameraFragment {
   float PORTRAIT_ASPECT_RATIO = 9 / 16f;
 
   @SuppressLint({ "RestrictedApi", "UnsafeOptInUsageError" })
-  static Fragment newInstance() {
+  static Fragment newInstance(boolean qrScanEnabled) {
     if (CameraXUtil.isSupported()) {
-      return CameraXFragment.newInstance();
+      return CameraXFragment.newInstance(qrScanEnabled);
     } else {
       return Camera1Fragment.newInstance();
     }
@@ -63,6 +63,7 @@ public interface CameraFragment {
     void onVideoCaptureError();
     void onGalleryClicked();
     void onCameraCountButtonClicked();
+    void onQrCodeFound(@NonNull String data);
     @NonNull Flowable<Optional<Media>> getMostRecentMediaItem();
     @NonNull MediaConstraints getMediaConstraints();
     int getMaxVideoDuration();

app/src/main/java/org/thoughtcrime/securesms/mediasend/CameraXFragment.java

@@ -28,9 +28,12 @@ import android.widget.ImageView;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.camera.core.CameraSelector;
+import androidx.camera.core.ImageAnalysis;
 import androidx.camera.core.ImageCapture;
 import androidx.camera.core.ImageCaptureException;
 import androidx.camera.core.ImageProxy;
+import androidx.camera.core.resolutionselector.ResolutionSelector;
+import androidx.camera.core.resolutionselector.ResolutionStrategy;
 import androidx.camera.view.PreviewView;
 import androidx.constraintlayout.widget.ConstraintLayout;
 import androidx.constraintlayout.widget.ConstraintSet;
@@ -42,6 +45,7 @@ import com.google.android.material.card.MaterialCardView;
 import org.signal.core.util.Stopwatch;
 import org.signal.core.util.concurrent.SimpleTask;
 import org.signal.core.util.logging.Log;
+import org.signal.qr.QrProcessor;
 import org.thoughtcrime.securesms.LoggingFragment;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.animation.AnimationCompleteListener;
@@ -61,6 +65,8 @@ import org.thoughtcrime.securesms.video.VideoUtil;
 
 import java.io.FileDescriptor;
 import java.io.IOException;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
 import io.reactivex.rxjava3.disposables.Disposable;
@@ -71,8 +77,9 @@ import io.reactivex.rxjava3.disposables.Disposable;
  */
 public class CameraXFragment extends LoggingFragment implements CameraFragment {
 
-  private static final String TAG              = Log.tag(CameraXFragment.class);
-  private static final String IS_VIDEO_ENABLED = "is_video_enabled";
+  private static final String TAG                = Log.tag(CameraXFragment.class);
+  private static final String IS_VIDEO_ENABLED   = "is_video_enabled";
+  private static final String IS_QR_SCAN_ENABLED = "is_qr_scan_enabled";
 
 
   private static final Rational              ASPECT_RATIO_16_9  = new Rational(16, 9);
@@ -90,24 +97,30 @@ public class CameraXFragment extends LoggingFragment implements CameraFragment {
   private CameraScreenBrightnessController cameraScreenBrightnessController;
   private boolean                          isMediaSelected;
 
+  private final Executor    qrAnalysisExecutor = Executors.newSingleThreadExecutor();
+  private final QrProcessor qrProcessor        = new QrProcessor();
+
   public static CameraXFragment newInstanceForAvatarCapture() {
     CameraXFragment fragment = new CameraXFragment();
     Bundle          args     = new Bundle();
 
     args.putBoolean(IS_VIDEO_ENABLED, false);
+    args.putBoolean(IS_QR_SCAN_ENABLED, false);
     fragment.setArguments(args);
 
     return fragment;
   }
 
-  public static CameraXFragment newInstance() {
+  public static CameraXFragment newInstance(boolean qrScanEnabled) {
     CameraXFragment fragment = new CameraXFragment();
 
-    fragment.setArguments(new Bundle());
+    Bundle args = new Bundle();
+    args.putBoolean(IS_QR_SCAN_ENABLED, qrScanEnabled);
+
+    fragment.setArguments(args);
 
     return fragment;
   }
-
   @Override
   public void onAttach(@NonNull Context context) {
     super.onAttach(context);
@@ -156,6 +169,26 @@ public class CameraXFragment extends LoggingFragment implements CameraFragment {
     onOrientationChanged();
     cameraController.bindToLifecycle(() -> Log.d(TAG, "Camera init complete from onViewCreated"));
 
+    if (requireArguments().getBoolean(IS_QR_SCAN_ENABLED, false)) {
+      ImageAnalysis imageAnalysis = new ImageAnalysis.Builder()
+          .setResolutionSelector(new ResolutionSelector.Builder().setResolutionStrategy(ResolutionStrategy.HIGHEST_AVAILABLE_STRATEGY).build())
+          .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
+          .build();
+
+      imageAnalysis.setAnalyzer(qrAnalysisExecutor, imageProxy -> {
+        try {
+          String data = qrProcessor.getScannedData(imageProxy);
+          if (data != null) {
+            controller.onQrCodeFound(data);
+          }
+        } finally {
+          imageProxy.close();
+        }
+      });
+
+      cameraController.addUseCase(imageAnalysis);
+    }
+
     view.addOnLayoutChangeListener((v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom) -> {
       // Let's assume portrait for now, so 9:16
       float aspectRatio = CameraFragment.getAspectRatioForOrientation(Configuration.ORIENTATION_PORTRAIT);

app/src/main/java/org/thoughtcrime/securesms/mediasend/camerax/SignalCameraController.kt

@@ -15,7 +15,6 @@ import androidx.annotation.MainThread
 import androidx.annotation.RequiresApi
 import androidx.annotation.RequiresPermission
 import androidx.camera.core.Camera
-import androidx.camera.core.CameraProvider
 import androidx.camera.core.CameraSelector
 import androidx.camera.core.FocusMeteringAction
 import androidx.camera.core.FocusMeteringResult
@@ -72,6 +71,7 @@ class SignalCameraController(val context: Context, val lifecycleOwner: Lifecycle
   private val cameraProviderFuture: ListenableFuture<ProcessCameraProvider> = ProcessCameraProvider.getInstance(context)
   private val viewPort: ViewPort? = previewView.getViewPort(Surface.ROTATION_0)
   private val initializationCompleteListeners: MutableSet<InitializationListener> = mutableSetOf()
+  private val customUseCases: MutableList<UseCase> = mutableListOf()
 
   private var imageRotation = 0
   private var recording: Recording? = null
@@ -129,6 +129,19 @@ class SignalCameraController(val context: Context, val lifecycleOwner: Lifecycle
     }
   }
 
+  @MainThread
+  fun addUseCase(useCase: UseCase) {
+    ThreadUtil.assertMainThread()
+
+    customUseCases += useCase
+
+    if (isRecording()) {
+      stopRecording()
+    }
+
+    tryToBindCamera()
+  }
+
   @MainThread
   fun takePicture(executor: Executor, callback: ImageCapture.OnImageCapturedCallback) {
     ThreadUtil.assertMainThread()
@@ -285,7 +298,7 @@ class SignalCameraController(val context: Context, val lifecycleOwner: Lifecycle
   }
 
   @MainThread
-  private fun tryToBindCamera(restoreStateRunnable: (() -> Unit)?) {
+  private fun tryToBindCamera(restoreStateRunnable: (() -> Unit)? = null) {
     ThreadUtil.assertMainThread()
     try {
       bindToLifecycleInternal()
@@ -353,6 +366,11 @@ class SignalCameraController(val context: Context, val lifecycleOwner: Lifecycle
     } else {
       cameraProvider.unbind(videoCaptureUseCase)
     }
+
+    for (useCase in customUseCases) {
+      addUseCase(useCase)
+    }
+
     if (viewPort != null) {
       setViewPort(viewPort)
     } else {
@@ -425,6 +443,6 @@ class SignalCameraController(val context: Context, val lifecycleOwner: Lifecycle
   }
 
   interface InitializationListener {
-    fun onInitialized(cameraProvider: CameraProvider)
+    fun onInitialized(cameraProvider: ProcessCameraProvider)
   }
 }

app/src/main/java/org/thoughtcrime/securesms/mediasend/v2/capture/MediaCaptureEvent.kt

@@ -1,8 +1,11 @@
 package org.thoughtcrime.securesms.mediasend.v2.capture
 
 import org.thoughtcrime.securesms.mediasend.Media
+import org.thoughtcrime.securesms.recipients.Recipient
 
 sealed class MediaCaptureEvent {
   data class MediaCaptureRendered(val media: Media) : MediaCaptureEvent()
+  data class UsernameScannedFromQrCode(val recipient: Recipient, val username: String) : MediaCaptureEvent()
+  object DeviceLinkScannedFromQrCode : MediaCaptureEvent()
   object MediaCaptureRenderFailed : MediaCaptureEvent()
 }

app/src/main/java/org/thoughtcrime/securesms/mediasend/v2/capture/MediaCaptureFragment.kt

@@ -8,9 +8,11 @@ import androidx.fragment.app.Fragment
 import androidx.fragment.app.viewModels
 import androidx.navigation.fragment.findNavController
 import app.cash.exhaustive.Exhaustive
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import io.reactivex.rxjava3.core.Flowable
 import org.signal.core.util.concurrent.LifecycleDisposable
 import org.signal.core.util.logging.Log
+import org.thoughtcrime.securesms.DeviceActivity
 import org.thoughtcrime.securesms.R
 import org.thoughtcrime.securesms.mediasend.CameraFragment
 import org.thoughtcrime.securesms.mediasend.Media
@@ -21,6 +23,7 @@ import org.thoughtcrime.securesms.mediasend.v2.MediaSelectionViewModel
 import org.thoughtcrime.securesms.mms.MediaConstraints
 import org.thoughtcrime.securesms.permissions.Permissions
 import org.thoughtcrime.securesms.stories.Stories
+import org.thoughtcrime.securesms.util.CommunicationActions
 import org.thoughtcrime.securesms.util.navigation.safeNavigate
 import java.io.FileDescriptor
 import java.util.Optional
@@ -47,7 +50,7 @@ class MediaCaptureFragment : Fragment(R.layout.fragment_container), CameraFragme
   private val lifecycleDisposable = LifecycleDisposable()
 
   override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-    captureChildFragment = CameraFragment.newInstance() as CameraFragment
+    captureChildFragment = CameraFragment.newInstance(sharedViewModel.isContactSelectionRequired) as CameraFragment
 
     navigator = MediaSelectionNavigator(
       toGallery = R.id.action_mediaCaptureFragment_to_mediaGalleryFragment
@@ -74,6 +77,28 @@ class MediaCaptureFragment : Fragment(R.layout.fragment_container), CameraFragme
 
           navigator.goToReview(findNavController())
         }
+        is MediaCaptureEvent.UsernameScannedFromQrCode -> {
+          MaterialAlertDialogBuilder(requireContext())
+            .setTitle(getString(R.string.MediaCaptureFragment_username_dialog_title, event.username))
+            .setMessage(getString(R.string.MediaCaptureFragment_username_dialog_body, event.username))
+            .setPositiveButton(R.string.MediaCaptureFragment_username_dialog_go_to_chat_button) { d, _ ->
+              CommunicationActions.startConversation(requireContext(), event.recipient, "")
+              requireActivity().finish()
+            }
+            .setNegativeButton(android.R.string.cancel, null)
+            .show()
+        }
+        is MediaCaptureEvent.DeviceLinkScannedFromQrCode -> {
+          MaterialAlertDialogBuilder(requireContext())
+            .setTitle(R.string.MediaCaptureFragment_device_link_dialog_title)
+            .setMessage(R.string.MediaCaptureFragment_device_link_dialog_body)
+            .setPositiveButton(R.string.MediaCaptureFragment_device_link_dialog_continue) { d, _ ->
+              startActivity(DeviceActivity.getIntentForScanner(requireContext()))
+              requireActivity().finish()
+            }
+            .setNegativeButton(android.R.string.cancel, null)
+            .show()
+        }
       }
     }
 
@@ -149,6 +174,10 @@ class MediaCaptureFragment : Fragment(R.layout.fragment_container), CameraFragme
     }
   }
 
+  override fun onQrCodeFound(data: String) {
+    viewModel.onQrCodeFound(data)
+  }
+
   override fun getMostRecentMediaItem(): Flowable<Optional<Media>> {
     return viewModel.getMostRecentMedia()
   }

app/src/main/java/org/thoughtcrime/securesms/mediasend/v2/capture/MediaCaptureViewModel.kt

@@ -5,20 +5,34 @@ import androidx.lifecycle.ViewModelProvider
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
 import io.reactivex.rxjava3.core.Flowable
 import io.reactivex.rxjava3.core.Observable
+import io.reactivex.rxjava3.disposables.CompositeDisposable
+import io.reactivex.rxjava3.kotlin.plusAssign
+import io.reactivex.rxjava3.schedulers.Schedulers
 import io.reactivex.rxjava3.subjects.PublishSubject
 import io.reactivex.rxjava3.subjects.Subject
+import org.signal.core.util.logging.Log
+import org.thoughtcrime.securesms.components.settings.app.usernamelinks.main.QrScanResult
 import org.thoughtcrime.securesms.mediasend.Media
+import org.thoughtcrime.securesms.profiles.manage.UsernameRepository
+import org.thoughtcrime.securesms.recipients.Recipient
 import org.thoughtcrime.securesms.util.rx.RxStore
 import java.io.FileDescriptor
 import java.util.Optional
+import java.util.concurrent.TimeUnit
 
 class MediaCaptureViewModel(private val repository: MediaCaptureRepository) : ViewModel() {
 
+  companion object {
+    private val TAG = Log.tag(MediaCaptureViewModel::class.java)
+  }
+
   private val store: RxStore<MediaCaptureState> = RxStore(MediaCaptureState())
 
   private val internalEvents: Subject<MediaCaptureEvent> = PublishSubject.create()
+  private val qrData: Subject<String> = PublishSubject.create()
 
   val events: Observable<MediaCaptureEvent> = internalEvents.observeOn(AndroidSchedulers.mainThread())
+  val disposables = CompositeDisposable()
 
   init {
     repository.getMostRecentItem { media ->
@@ -26,10 +40,42 @@ class MediaCaptureViewModel(private val repository: MediaCaptureRepository) : Vi
         state.copy(mostRecentMedia = media)
       }
     }
+
+    disposables += qrData
+      .throttleFirst(5, TimeUnit.SECONDS)
+      .filter { UsernameRepository.isValidLink(it) }
+      .subscribeOn(Schedulers.io())
+      .flatMapSingle { url ->
+        UsernameRepository.fetchUsernameAndAciFromLink(url)
+          .map { result ->
+            when (result) {
+              is UsernameRepository.UsernameLinkConversionResult.Success -> QrScanResult.Success(result.username.toString(), Recipient.externalUsername(result.aci, result.username.toString()))
+              is UsernameRepository.UsernameLinkConversionResult.Invalid,
+              is UsernameRepository.UsernameLinkConversionResult.NotFound,
+              is UsernameRepository.UsernameLinkConversionResult.NetworkError -> QrScanResult.Failure
+            }
+          }
+      }
+      .observeOn(AndroidSchedulers.mainThread())
+      .subscribe { data ->
+        if (data is QrScanResult.Success) {
+          internalEvents.onNext(MediaCaptureEvent.UsernameScannedFromQrCode(data.recipient, data.username))
+        } else {
+          Log.w(TAG, "Failed to scan QR code.")
+        }
+      }
+
+    disposables += qrData
+      .throttleFirst(5, TimeUnit.SECONDS)
+      .filter { it.startsWith("sgnl://linkdevice") }
+      .subscribe { data ->
+        internalEvents.onNext(MediaCaptureEvent.DeviceLinkScannedFromQrCode)
+      }
   }
 
   override fun onCleared() {
     store.dispose()
+    disposables.dispose()
   }
 
   fun onImageCaptured(data: ByteArray, width: Int, height: Int) {
@@ -44,6 +90,10 @@ class MediaCaptureViewModel(private val repository: MediaCaptureRepository) : Vi
     return store.stateFlowable.map { Optional.ofNullable(it.mostRecentMedia) }
   }
 
+  fun onQrCodeFound(data: String) {
+    qrData.onNext(data)
+  }
+
   private fun onMediaRendered(media: Media) {
     internalEvents.onNext(MediaCaptureEvent.MediaCaptureRendered(media))
   }
@@ -52,6 +102,11 @@ class MediaCaptureViewModel(private val repository: MediaCaptureRepository) : Vi
     internalEvents.onNext(MediaCaptureEvent.MediaCaptureRenderFailed)
   }
 
+  private sealed class QrScanResult {
+    data class Success(val username: String, val recipient: Recipient) : QrScanResult()
+    object Failure : QrScanResult()
+  }
+
   class Factory(private val repository: MediaCaptureRepository) : ViewModelProvider.Factory {
     override fun <T : ViewModel> create(modelClass: Class<T>): T {
       return requireNotNull(modelClass.cast(MediaCaptureViewModel(repository)))

app/src/main/java/org/thoughtcrime/securesms/profiles/manage/UsernameRepository.kt

@@ -311,6 +311,10 @@ object UsernameRepository {
     return BASE_URL + base64
   }
 
+  fun isValidLink(url: String): Boolean {
+    return parseLink(url) != null
+  }
+
   @JvmStatic
   fun onUsernameConsistencyValidated() {
     SignalStore.account().usernameSyncState = AccountValues.UsernameSyncState.IN_SYNC

app/src/main/res/values/strings.xml

@@ -4906,6 +4906,20 @@
     <string name="MediaReviewImagePageFragment__discard_changes">Discard changes?</string>
     <string name="MediaReviewImagePageFragment__youll_lose_any_changes">You\'ll lose any changes you\'ve made to this photo.</string>
 
+    <!-- The title of a dialog notifying that a user was found matching a scanned QR code. The placeholder is a username. Usernames are always latin characters. -->
+    <string name="MediaCaptureFragment_username_dialog_title">Found %1$s</string>
+    <!-- The body of a dialog notifying that a user was found matching a scanned QR code, prompting the user to start a chat with them. The placeholder is a username. Usernames are always latin characters. -->
+    <string name="MediaCaptureFragment_username_dialog_body">Start a chat with \"%1$s\"</string>
+    <!-- The label of a dialog asking the user if they would like to start a chat with a specific user. -->
+    <string name="MediaCaptureFragment_username_dialog_go_to_chat_button">Go to chat</string>
+
+    <!-- The title of a dialog notifying that the user scanned a QR code that could be used to link a Signal device. -->
+    <string name="MediaCaptureFragment_device_link_dialog_title">Link device?</string>
+    <!-- The body of a dialog notifying that the user scanned a QR code that could be used to link a Signal device. -->
+    <string name="MediaCaptureFragment_device_link_dialog_body">It looks like you\'re trying to link a Signal device. Tap continue and scan the code again to link it.</string>
+    <!-- The label of a dialog asking the user if they would like to continue to the linked device settings screen. -->
+    <string name="MediaCaptureFragment_device_link_dialog_continue">Continue</string>
+
 
     <string name="BadgesOverviewFragment__my_badges">My badges</string>
     <string name="BadgesOverviewFragment__featured_badge">Featured badge</string>