support scanning from image data

android/flutter_plugins/qrscanner_zxing/android/src/main/kotlin/com/yubico/authenticator/flutter_plugins/qrscanner_zxing/QRScannerView.kt

@@ -36,7 +36,9 @@ import androidx.core.content.ContextCompat
 import androidx.core.content.ContextCompat.startActivity
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.Observer
-import com.google.zxing.*
+import com.google.zxing.BinaryBitmap
+import com.google.zxing.NotFoundException
+import com.google.zxing.RGBLuminanceSource
 import com.google.zxing.common.HybridBinarizer
 import io.flutter.plugin.common.BinaryMessenger
 import io.flutter.plugin.common.MethodChannel
@@ -290,11 +292,6 @@ internal class QRScannerView(
     ) : ImageAnalysis.Analyzer {
 
         var analysisPaused = false
-
-        val multiFormatReader = MultiFormatReader().also {
-            it.setHints(mapOf(DecodeHintType.POSSIBLE_FORMATS to listOf(BarcodeFormat.QR_CODE)))
-        }
-
         var analyzedImagesCount = 0
 
         private fun ByteBuffer.toByteArray(lastRowPadding: Int): ByteArray {
@@ -392,14 +389,14 @@ internal class QRScannerView(
                     fullSize
                 }
 
-                val result: com.google.zxing.Result = multiFormatReader.decode(bitmapToProcess)
+                val result = QrCodeScanner.scan(bitmapToProcess)
                 if (analysisPaused) {
                     return
                 }
 
                 analysisPaused = true // pause
-                Log.v(TAG, "Analysis result: ${result.text}")
+                Log.v(TAG, "Analysis result: $result")
-                listener.invoke(Result.success(result.text))
+                listener.invoke(Result.success(result))
             } catch (_: NotFoundException) {
                 if (analyzedImagesCount == 0) {
                     Log.v(TAG, "  No QR code found (NotFoundException)")

android/flutter_plugins/qrscanner_zxing/android/src/main/kotlin/com/yubico/authenticator/flutter_plugins/qrscanner_zxing/QRScannerZxingPlugin.kt

@@ -16,6 +16,12 @@
 
 package com.yubico.authenticator.flutter_plugins.qrscanner_zxing
 
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.util.Log
+import com.google.zxing.BinaryBitmap
+import com.google.zxing.RGBLuminanceSource
+import com.google.zxing.common.HybridBinarizer
 import io.flutter.embedding.engine.plugins.FlutterPlugin
 import io.flutter.embedding.engine.plugins.activity.ActivityAware
 import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
@@ -24,6 +30,7 @@ import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugin.common.MethodChannel.Result
 import io.flutter.plugin.common.PluginRegistry
+import java.lang.Exception
 
 class PermissionsResultRegistrar {
 
@@ -65,10 +72,48 @@ class QRScannerZxingPlugin : FlutterPlugin, MethodCallHandler, ActivityAware,
     }
 
     override fun onMethodCall(call: MethodCall, result: Result) {
-        if (call.method == "getPlatformVersion") {
+        when (call.method) {
-            result.success("Android ${android.os.Build.VERSION.RELEASE}")
+            "getPlatformVersion" -> {
-        } else {
+                result.success("Android ${android.os.Build.VERSION.RELEASE}")
-            result.notImplemented()
+            }
+            "scanBitmap" -> {
+                val imageFileData = call.argument<ByteArray>("bitmap")
+                var bitmap: Bitmap? = null
+                try {
+                    imageFileData?.let { byteArray ->
+                        Log.i(TAG, "Received ${byteArray.size} bytes")
+                        val options = BitmapFactory.Options()
+                        options.inSampleSize = 4
+                        bitmap = BitmapFactory.decodeByteArray(imageFileData, 0, byteArray.size, options)
+                        bitmap?.let {
+                            val intArray = IntArray(it.allocationByteCount)
+                            it.getPixels(intArray, 0, it.width, 0, 0, it.width, it.height)
+                            val luminanceSource =
+                                RGBLuminanceSource(it.rowBytes, it.height, intArray)
+                            val binaryBitmap = BinaryBitmap(HybridBinarizer(luminanceSource))
+                            val scanResult = QrCodeScanner.scan(binaryBitmap)
+                            Log.i(TAG, "Scan result: $scanResult")
+                            result.success(scanResult)
+                            return
+                        }
+                    }
+                } catch (e: Exception) {
+                    Log.e(TAG, "Failure decoding data: $e")
+                    result.error("Failed to decode", e.message, e)
+                    return
+                } finally {
+                    bitmap?.let {
+                        it.recycle()
+                        bitmap = null
+                    }
+                }
+
+                Log.e(TAG, "Failure decoding data: Invalid image format ")
+                result.error("Failed to decode", "Invalid image format", null)
+            }
+            else -> {
+                result.notImplemented()
+            }
         }
     }
 
@@ -97,4 +142,8 @@ class QRScannerZxingPlugin : FlutterPlugin, MethodCallHandler, ActivityAware,
     ): Boolean {
         return registrar.onResult(requestCode, permissions, grantResults)
     }
+
+    companion object {
+        const val TAG = "QRScannerZxPlugin"
+    }
 }

android/flutter_plugins/qrscanner_zxing/android/src/main/kotlin/com/yubico/authenticator/flutter_plugins/qrscanner_zxing/QrScanner.kt

@@ -0,0 +1,18 @@
+package com.yubico.authenticator.flutter_plugins.qrscanner_zxing
+
+import com.google.zxing.BarcodeFormat
+import com.google.zxing.BinaryBitmap
+import com.google.zxing.DecodeHintType
+import com.google.zxing.MultiFormatReader
+
+object QrCodeScanner {
+
+    private val qrCodeScanner = MultiFormatReader().also {
+        it.setHints(mapOf(DecodeHintType.POSSIBLE_FORMATS to listOf(BarcodeFormat.QR_CODE)))
+    }
+
+    fun scan(binaryBitmap: BinaryBitmap) : String {
+        val result: com.google.zxing.Result = qrCodeScanner.decode(binaryBitmap)
+        return result.text
+    }
+}

android/flutter_plugins/qrscanner_zxing/example/android/app/build.gradle

@@ -26,9 +26,11 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 33
+    compileSdk 34
     ndkVersion flutter.ndkVersion
 
+    namespace 'com.yubico.authenticator.flutter_plugins.qrscanner_zxing_example'
+
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
@@ -48,7 +50,7 @@ android {
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
         minSdkVersion 21
-        targetSdkVersion 33
+        targetSdkVersion 34
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }
@@ -60,6 +62,10 @@ android {
             signingConfig signingConfigs.debug
         }
     }
+
+    buildFeatures {
+        buildConfig true
+    }
 }
 
 flutter {

android/flutter_plugins/qrscanner_zxing/example/android/build.gradle

@@ -1,12 +1,12 @@
 buildscript {
-    ext.kotlin_version = '1.7.21'
+    ext.kotlin_version = '1.9.10'
     repositories {
         google()
         mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.1.3'
+        classpath 'com.android.tools.build:gradle:8.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
@@ -26,6 +26,6 @@ subprojects {
     project.evaluationDependsOn(':app')
 }
 
-task clean(type: Delete) {
+tasks.register('clean', Delete) {
     delete rootProject.buildDir
 }

android/flutter_plugins/qrscanner_zxing/example/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-all.zip

android/flutter_plugins/qrscanner_zxing/example/lib/main.dart

@@ -14,7 +14,9 @@
  * limitations under the License.
  */
 
+import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
+import 'package:qrscanner_zxing/qrscanner_zxing_method_channel.dart';
 import 'package:qrscanner_zxing/qrscanner_zxing_view.dart';
 
 import 'cutout_overlay.dart';
@@ -64,6 +66,32 @@ class AppHomePage extends StatelessWidget {
                       ));
                 },
                 child: const Text("Open QR Scanner")),
+            ElevatedButton(
+                onPressed: () async {
+                  final result = await FilePicker.platform.pickFiles(
+                      allowedExtensions: ['png', 'jpg'],
+                      type: FileType.custom,
+                      allowMultiple: false,
+                      lockParentWindow: true,
+                      withData: true,
+                      dialogTitle: 'Select file with QR code');
+
+                  if (result == null || !result.isSinglePick) {
+                    // no result
+                    return;
+                  }
+
+                  final bytes = result.files.first.bytes;
+
+                  if (bytes != null) {
+                    var channel = MethodChannelQRScannerZxing();
+                    var value = await channel.scanBitmap(bytes);
+                    debugPrint(value);
+                  } else {
+                    // no files selected
+                  }
+                },
+                child: const Text("Scan from file")),
           ],
         ),
       ),

android/flutter_plugins/qrscanner_zxing/example/pubspec.lock

@@ -37,10 +37,10 @@ packages:
     dependency: transitive
     description:
       name: collection
-      sha256: "4a07be6cb69c84d677a6c3096fcf960cc3285a8330b4603e0d463d15d9bd934c"
+      sha256: f092b211a4319e98e5ff58223576de6c2803db36221657b46c82574721240687
       url: "https://pub.dev"
     source: hosted
-    version: "1.17.1"
+    version: "1.17.2"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -57,6 +57,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.1"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      sha256: "7bf0adc28a23d395f19f3f1eb21dd7cfd1dd9f8e1c50051c069122e6853bc878"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
+  file_picker:
+    dependency: "direct main"
+    description:
+      name: file_picker
+      sha256: be325344c1f3070354a1d84a231a1ba75ea85d413774ec4bdf444c023342e030
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.5.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -70,19 +86,24 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.1"
+  flutter_plugin_android_lifecycle:
+    dependency: transitive
+    description:
+      name: flutter_plugin_android_lifecycle
+      sha256: f185ac890306b5779ecbd611f52502d8d4d63d27703ef73161ca0407e815f02c
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.16"
   flutter_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
-  js:
+  flutter_web_plugins:
     dependency: transitive
-    description:
+    description: flutter
-      name: js
+    source: sdk
-      sha256: f2c445dce49627136094980615a031419f7f3eb393237e4ecd97ac15dea343f3
+    version: "0.0.0"
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.6.7"
   lints:
     dependency: transitive
     description:
@@ -95,18 +116,18 @@ packages:
     dependency: transitive
     description:
       name: matcher
-      sha256: "6501fbd55da300384b768785b83e5ce66991266cec21af89ab9ae7f5ce1c4cbb"
+      sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
       url: "https://pub.dev"
     source: hosted
-    version: "0.12.15"
+    version: "0.12.16"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
-      sha256: d92141dc6fe1dad30722f9aa826c7fbc896d021d792f80678280601aff8cf724
+      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
       url: "https://pub.dev"
     source: hosted
-    version: "0.2.0"
+    version: "0.5.0"
   meta:
     dependency: transitive
     description:
@@ -127,10 +148,10 @@ packages:
     dependency: transitive
     description:
       name: plugin_platform_interface
-      sha256: dbf0f707c78beedc9200146ad3cb0ab4d5da13c246336987be6940f026500d3a
+      sha256: da3fdfeccc4d4ff2da8f8c556704c08f912542c5fb3cf2233ed75372384a034d
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.3"
+    version: "2.1.6"
   qrscanner_zxing:
     dependency: "direct main"
     description:
@@ -147,10 +168,10 @@ packages:
     dependency: transitive
     description:
       name: source_span
-      sha256: dd904f795d4b4f3b870833847c461801f6750a9fa8e61ea5ac53f9422b31f250
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
       url: "https://pub.dev"
     source: hosted
-    version: "1.9.1"
+    version: "1.10.0"
   stack_trace:
     dependency: transitive
     description:
@@ -187,10 +208,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: eb6ac1540b26de412b3403a163d919ba86f6a973fe6cc50ae3541b80092fdcfb
+      sha256: "75760ffd7786fffdfb9597c35c5b27eaeec82be8edfb6d71d32651128ed7aab8"
       url: "https://pub.dev"
     source: hosted
-    version: "0.5.1"
+    version: "0.6.0"
   vector_math:
     dependency: transitive
     description:
@@ -199,6 +220,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: dc8ccd225a2005c1be616fe02951e2e342092edf968cf0844220383757ef8f10
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.4-beta"
+  win32:
+    dependency: transitive
+    description:
+      name: win32
+      sha256: "350a11abd2d1d97e0cc7a28a81b781c08002aa2864d9e3f192ca0ffa18b06ed3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.0.9"
 sdks:
-  dart: ">=3.0.0-0 <4.0.0"
+  dart: ">=3.1.0-185.0.dev <4.0.0"
-  flutter: ">=2.5.0"
+  flutter: ">=3.7.0"

android/flutter_plugins/qrscanner_zxing/example/pubspec.yaml

@@ -4,7 +4,7 @@ description: Demonstrates how to use the qrscanner_zxing plugin.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
 environment:
-  sdk: ">=2.17.0-266.1.beta <3.0.0"
+  sdk: '>=3.0.0 <4.0.0'
 
 dependencies:
   flutter:
@@ -14,6 +14,7 @@ dependencies:
     path: ../
 
   cupertino_icons: ^1.0.2
+  file_picker: ^5.3.2
 
 dev_dependencies:
   flutter_test:

android/flutter_plugins/qrscanner_zxing/lib/qrscanner_zxing.dart

@@ -14,10 +14,16 @@
  * limitations under the License.
  */
 
+import 'dart:typed_data';
+
 import 'qrscanner_zxing_platform_interface.dart';
 
 class QRScannerZxing {
   Future<String?> getPlatformVersion() {
     return QRScannerZxingPlatform.instance.getPlatformVersion();
   }
+
+  Future<String?> scanBitmap(Uint8List bitmap) {
+    return QRScannerZxingPlatform.instance.scanBitmap(bitmap);
+  }
 }

android/flutter_plugins/qrscanner_zxing/lib/qrscanner_zxing_method_channel.dart

@@ -31,4 +31,11 @@ class MethodChannelQRScannerZxing extends QRScannerZxingPlatform {
         await methodChannel.invokeMethod<String>('getPlatformVersion');
     return version;
   }
+
+  @override
+  Future<String?> scanBitmap(Uint8List bitmap) async {
+    final version = await methodChannel
+        .invokeMethod<String>('scanBitmap', {'bitmap': bitmap});
+    return version;
+  }
 }

android/flutter_plugins/qrscanner_zxing/lib/qrscanner_zxing_platform_interface.dart

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import 'dart:typed_data';
+
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
 
 import 'qrscanner_zxing_method_channel.dart';
@@ -42,4 +44,8 @@ abstract class QRScannerZxingPlatform extends PlatformInterface {
   Future<String?> getPlatformVersion() {
     throw UnimplementedError('platformVersion() has not been implemented.');
   }
+
+  Future<String?> scanBitmap(Uint8List bitmap) {
+    throw UnimplementedError('platformVersion() has not been implemented.');
+  }
 }

android/flutter_plugins/qrscanner_zxing/test/qrscanner_zxing_test.dart

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import 'dart:typed_data';
+
 import 'package:flutter_test/flutter_test.dart';
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
 import 'package:qrscanner_zxing/qrscanner_zxing.dart';
@@ -25,6 +27,10 @@ class MockQRScannerZxingPlatform
     implements QRScannerZxingPlatform {
   @override
   Future<String?> getPlatformVersion() => Future.value('42');
+
+  @override
+  Future<String?> scanBitmap(Uint8List bitmap) =>
+      Future.value(bitmap.length.toString());
 }
 
 void main() {
@@ -42,4 +48,12 @@ void main() {
 
     expect(await qrscannerZxingPlugin.getPlatformVersion(), '42');
   });
+
+  test('scanBitmap', () async {
+    QRScannerZxing qrscannerZxingPlugin = QRScannerZxing();
+    MockQRScannerZxingPlatform fakePlatform = MockQRScannerZxingPlatform();
+    QRScannerZxingPlatform.instance = fakePlatform;
+
+    expect(await qrscannerZxingPlugin.scanBitmap(Uint8List(10)), '10');
+  });
 }

lib/android/keys.dart

@@ -22,6 +22,7 @@ const _prefix = 'android.keys';
 
 const okButton = Key('$_prefix.ok');
 const manualEntryButton = Key('$_prefix.manual_entry');
+const readFromImage = Key('$_prefix.read_image_file');
 
 const nfcBypassTouchSetting = Key('$_prefix.nfc_bypass_touch');
 const nfcSilenceSoundsSettings = Key('$_prefix.nfc_silence_sounds');

lib/android/qr_scanner/qr_scanner_provider.dart

@@ -14,39 +14,50 @@
  * limitations under the License.
  */
 
+import 'dart:convert';
+
 import 'package:flutter/material.dart';
 import 'package:yubico_authenticator/app/state.dart';
 import 'package:yubico_authenticator/exception/cancellation_exception.dart';
 import 'package:yubico_authenticator/theme.dart';
 
+import 'package:qrscanner_zxing/qrscanner_zxing_method_channel.dart';
+
 import 'qr_scanner_view.dart';
 
 class AndroidQrScanner implements QrScanner {
   final WithContext _withContext;
+
   AndroidQrScanner(this._withContext);
 
   @override
-  Future<String?> scanQr([String? _]) async {
+  Future<String?> scanQr([String? imageData]) async {
-    var scannedCode = await _withContext(
+    if (imageData == null) {
-        (context) async => await Navigator.of(context).push(PageRouteBuilder(
+      var scannedCode = await _withContext(
-              pageBuilder: (_, __, ___) =>
+              (context) async =>
-                  Theme(data: AppTheme.darkTheme, child: const QrScannerView()),
+          await Navigator.of(context).push(PageRouteBuilder(
-              settings: const RouteSettings(name: 'android_qr_scanner_view'),
+            pageBuilder: (_, __, ___) =>
-              transitionDuration: const Duration(seconds: 0),
+                Theme(data: AppTheme.darkTheme, child: const QrScannerView()),
-              reverseTransitionDuration: const Duration(seconds: 0),
+            settings: const RouteSettings(name: 'android_qr_scanner_view'),
-            )));
+            transitionDuration: const Duration(seconds: 0),
-    if (scannedCode == null) {
+            reverseTransitionDuration: const Duration(seconds: 0),
-      // user has cancelled the scan
+          )));
-      throw CancellationException();
+      if (scannedCode == null) {
+        // user has cancelled the scan
+        throw CancellationException();
+      }
+      if (scannedCode == '') {
+        return null;
+      }
+      return scannedCode;
+    } else {
+      var zxingChannel = MethodChannelQRScannerZxing();
+      return await zxingChannel.scanBitmap(base64Decode(imageData));
     }
-    if (scannedCode == '') {
-      return null;
-    }
-    return scannedCode;
   }
 }
 
 QrScanner? Function(dynamic) androidQrScannerProvider(hasCamera) {
   return (ref) =>
-      hasCamera ? AndroidQrScanner(ref.watch(withContextProvider)) : null;
+  hasCamera ? AndroidQrScanner(ref.watch(withContextProvider)) : null;
 }

lib/android/qr_scanner/qr_scanner_ui_view.dart

@@ -14,13 +14,18 @@
  * limitations under the License.
  */
 
+import 'dart:convert';
+
+import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:yubico_authenticator/app/state.dart';
 
 import '../keys.dart' as keys;
 import 'qr_scanner_scan_status.dart';
 
-class QRScannerUI extends StatelessWidget {
+class QRScannerUI extends ConsumerWidget {
   final ScanStatus status;
   final Size screenSize;
   final GlobalKey overlayWidgetKey;
@@ -32,7 +37,7 @@ class QRScannerUI extends StatelessWidget {
       required this.overlayWidgetKey});
 
   @override
-  Widget build(BuildContext context) {
+  Widget build(BuildContext context, WidgetRef ref) {
     final l10n = AppLocalizations.of(context)!;
 
     return Stack(
@@ -73,15 +78,51 @@ class QRScannerUI extends StatelessWidget {
                     textScaleFactor: 0.7,
                     style: const TextStyle(color: Colors.white),
                   ),
-                  OutlinedButton(
+                  Row(
-                      onPressed: () {
+                    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
-                        Navigator.of(context).pop('');
+                    children: [
-                      },
+                      OutlinedButton(
-                      key: keys.manualEntryButton,
+                          onPressed: () {
-                      child: Text(
+                            Navigator.of(context).pop('');
-                        l10n.s_enter_manually,
+                          },
-                        style: const TextStyle(color: Colors.white),
+                          key: keys.manualEntryButton,
-                      )),
+                          child: Text(
+                            l10n.s_enter_manually,
+                            style: const TextStyle(color: Colors.white),
+                          )),
+                      OutlinedButton(
+                          onPressed: () async {
+                            Navigator.of(context).pop('');
+                            final result = await FilePicker.platform.pickFiles(
+                                allowedExtensions: ['png', 'jpg'],
+                                type: FileType.custom,
+                                allowMultiple: false,
+                                lockParentWindow: true,
+                                dialogTitle: 'Select file with QR code');
+                            if (result != null && result.files.isNotEmpty) {
+                              final fileWithCode = result.files.first;
+                              final bytes = fileWithCode.bytes;
+                              if (bytes == null || bytes.isEmpty) {
+                                //err return
+                                return;
+                              }
+                              if (bytes.length > 3 * 1024 * 1024) {
+                                // too big file
+                                return;
+                              }
+                              final scanner = ref.read(qrScannerProvider);
+                              if (scanner != null) {
+                                await scanner.scanQr(base64UrlEncode(bytes));
+                              }
+                            }
+                          },
+                          key: keys.readFromImage,
+                          child: Text(
+                            l10n.s_read_from_image,
+                            style: const TextStyle(color: Colors.white),
+                          )),
+                    ],
+                  ),
                 ],
               ),
               const SizedBox(height: 8)

lib/l10n/app_en.arb

@@ -516,6 +516,7 @@
     "q_want_to_scan": "Would like to scan?",
     "q_no_qr": "No QR code?",
     "s_enter_manually": "Enter manually",
+    "s_read_from_image": "Provide image file",
 
     "@_factory_reset": {},
     "s_reset": "Reset",