Add ability to scan linked device qr code from gallery.

app/src/main/java/org/thoughtcrime/securesms/linkdevice/AddLinkDeviceFragment.kt

@@ -34,6 +34,7 @@ import org.signal.core.util.logging.Log
 import org.thoughtcrime.securesms.BiometricDeviceAuthentication
 import org.thoughtcrime.securesms.BiometricDeviceLockContract
 import org.thoughtcrime.securesms.R
+import org.thoughtcrime.securesms.components.settings.app.usernamelinks.main.QrImageSelectionActivity
 import org.thoughtcrime.securesms.compose.ComposeFragment
 import org.thoughtcrime.securesms.permissions.Permissions
 import org.thoughtcrime.securesms.util.navigation.safeNavigate
@@ -50,6 +51,7 @@ class AddLinkDeviceFragment : ComposeFragment() {
   private val viewModel: LinkDeviceViewModel by activityViewModels()
   private lateinit var biometricAuth: BiometricDeviceAuthentication
   private lateinit var biometricDeviceLockLauncher: ActivityResultLauncher<String>
+  private lateinit var galleryLauncher: ActivityResultLauncher<Unit>
 
   override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
     super.onViewCreated(view, savedInstanceState)
@@ -72,6 +74,12 @@ class AddLinkDeviceFragment : ComposeFragment() {
       BiometricPrompt(requireActivity(), BiometricAuthenticationListener()),
       promptInfo
     )
+
+    galleryLauncher = registerForActivityResult(QrImageSelectionActivity.Contract()) { uri ->
+      if (uri != null) {
+        viewModel.scanImage(requireContext(), uri)
+      }
+    }
   }
 
   override fun onPause() {
@@ -113,7 +121,8 @@ class AddLinkDeviceFragment : ComposeFragment() {
         viewModel.onLinkDeviceResult(true)
         navController.popBackStack()
       },
-      onLinkDeviceFailure = { viewModel.onLinkDeviceResult(false) }
+      onLinkDeviceFailure = { viewModel.onLinkDeviceResult(false) },
+      onGalleryOpened = { galleryLauncher.launch(Unit) }
     )
   }
 
@@ -161,7 +170,8 @@ private fun MainScreen(
   onQrCodeDismissed: () -> Unit = {},
   onQrCodeRetry: () -> Unit = {},
   onLinkDeviceSuccess: () -> Unit = {},
-  onLinkDeviceFailure: () -> Unit = {}
+  onLinkDeviceFailure: () -> Unit = {},
+  onGalleryOpened: () -> Unit = {}
 ) {
   Scaffolds.Settings(
     title = "",
@@ -188,6 +198,7 @@ private fun MainScreen(
       linkDeviceResult = state.linkDeviceResult,
       onLinkDeviceSuccess = onLinkDeviceSuccess,
       onLinkDeviceFailure = onLinkDeviceFailure,
+      onGalleryOpened = onGalleryOpened,
       modifier = Modifier.padding(contentPadding)
     )
   }

app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceQrScanScreen.kt

@@ -37,6 +37,7 @@ fun LinkDeviceQrScanScreen(
   linkDeviceResult: LinkDeviceRepository.LinkDeviceResult,
   onLinkDeviceSuccess: () -> Unit,
   onLinkDeviceFailure: () -> Unit,
+  onGalleryOpened: () -> Unit,
   modifier: Modifier = Modifier
 ) {
   val lifecycleOwner = LocalLifecycleOwner.current
@@ -106,7 +107,8 @@ fun LinkDeviceQrScanScreen(
         },
         hasPermission = hasPermission,
         onRequestPermissions = onRequestPermissions,
-        qrString = stringResource(R.string.AddLinkDeviceFragment__scan_the_qr_code)
+        qrString = stringResource(R.string.AddLinkDeviceFragment__scan_the_qr_code),
+        onGalleryOpened = onGalleryOpened
       )
     }
   }

app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceViewModel.kt

@@ -4,11 +4,15 @@ import android.content.Context
 import android.net.Uri
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.DecodeFormat
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
+import org.signal.core.util.toOptional
+import org.signal.qr.QrProcessor
 import org.thoughtcrime.securesms.R
 import org.thoughtcrime.securesms.jobs.LinkedDeviceInactiveCheckJob
 
@@ -168,4 +172,24 @@ class LinkDeviceViewModel : ViewModel() {
       )
     }
   }
+
+  fun scanImage(context: Context, uri: Uri) {
+    viewModelScope.launch(Dispatchers.IO) {
+      val loadBitmap = Glide.with(context)
+        .asBitmap()
+        .format(DecodeFormat.PREFER_ARGB_8888)
+        .load(uri)
+        .submit()
+
+      val result = QrProcessor().getScannedData(loadBitmap.get()).toOptional()
+      if (result.isPresent) {
+        onQrCodeScanned(result.get())
+      } else {
+        _state.value = _state.value.copy(
+          qrCodeInvalid = true,
+          showFrontCamera = null
+        )
+      }
+    }
+  }
 }