fix: 4219 - check if new picture is big enough before server upload

packages/smooth_app/lib/background/background_task_image.dart

@@ -55,6 +55,14 @@ class BackgroundTaskImage extends BackgroundTaskUpload {
     return result;
   }
 
+  // cf. https://github.com/openfoodfacts/smooth-app/issues/4219
+  // TODO(monsieurtanuki): move to off-dart
+  static const int minimumWidth = 640;
+  static const int minimumHeight = 160;
+
+  static bool isPictureBigEnough(final num width, final num height) =>
+      width >= minimumWidth || height >= minimumHeight;
+
   /// Adds the background task about uploading a product image.
   static Future<void> addTask(
     final String barcode, {
@@ -213,19 +221,54 @@ class BackgroundTaskImage extends BackgroundTaskUpload {
   /// Conversion factor to `int` from / to UI / background task.
   static const int cropConversionFactor = 1000000;
 
-  /// Returns true if a cropped operation is needed - after having performed it.
-  Future<bool> _crop(final File file) async {
+  /// Returns true if a crop operation is needed - after having performed it.
+  ///
+  /// Returns false if no crop operation is needed.
+  /// Returns null if the image (cropped or not) is too small.
+  Future<bool?> _crop(final File file) async {
+    final ui.Image full = await loadUiImage(await File(fullPath).readAsBytes());
     if (cropX1 == 0 &&
         cropY1 == 0 &&
         cropX2 == cropConversionFactor &&
         cropY2 == cropConversionFactor &&
         rotationDegrees == 0) {
+      if (!isPictureBigEnough(full.width, full.height)) {
+        return null;
+      }
       // in that case, no need to crop
       return false;
     }
-    final ui.Image full = await loadUiImage(
-      await File(fullPath).readAsBytes(),
-    );
+
+    Size getCroppedSize() {
+      final Rect cropRect = getResizedRect(
+        Rect.fromLTRB(
+          cropX1.toDouble(),
+          cropY1.toDouble(),
+          cropX2.toDouble(),
+          cropY2.toDouble(),
+        ),
+        1 / cropConversionFactor,
+      );
+      switch (CropRotationExtension.fromDegrees(rotationDegrees)!) {
+        case CropRotation.up:
+        case CropRotation.down:
+          return Size(
+            cropRect.width * full.height,
+            cropRect.height * full.width,
+          );
+        case CropRotation.left:
+        case CropRotation.right:
+          return Size(
+            cropRect.width * full.width,
+            cropRect.height * full.height,
+          );
+      }
+    }
+
+    final Size croppedSize = getCroppedSize();
+    if (!isPictureBigEnough(croppedSize.width, croppedSize.height)) {
+      return null;
+    }
     final ui.Image cropped = await CropController.getCroppedBitmap(
       crop: getResizedRect(
         Rect.fromLTRB(
@@ -253,7 +296,12 @@ class BackgroundTaskImage extends BackgroundTaskUpload {
   Future<void> upload() async {
     final String path;
     final String croppedPath = _getCroppedPath();
-    if (await _crop(File(croppedPath))) {
+    final bool? neededCrop = await _crop(File(croppedPath));
+    if (neededCrop == null) {
+      // TODO(monsieurtanuki): maybe something more refined when we dismiss the picture, like alerting the user, though it's not supposed to happen anymore from upstream.
+      return;
+    }
+    if (neededCrop) {
       path = croppedPath;
     } else {
       path = fullPath;

packages/smooth_app/lib/l10n/app_en.arb

@@ -534,6 +534,28 @@
     "@crop_page_action_local": {
         "description": "Action being performed on the crop page"
     },
+    "crop_page_too_small_image_title": "The image is too small!",
+    "@crop_page_too_small_image_title": {
+        "description": "Title of a dialog warning the user that the image is too small for upload"
+    },
+    "crop_page_too_small_image_message": "The minimum size in pixels for picture upload is {expectedMinWidth}x{expectedMinHeight}. The current picture is {actualWidth}x{actualHeight}.",
+    "@crop_page_too_small_image_message": {
+        "description": "Message of a dialog warning the user that the image is too small for upload",
+        "placeholders": {
+            "expectedMinWidth": {
+                "type": "int"
+            },
+            "expectedMinHeight": {
+                "type": "int"
+            },
+            "actualWidth": {
+                "type": "int"
+            },
+            "actualHeight": {
+                "type": "int"
+            }
+        }
+    },
     "crop_page_action_server": "Preparing a call to the server…",
     "@crop_page_action_server": {
         "description": "Action being performed on the crop page"

packages/smooth_app/lib/pages/crop_page.dart

@@ -15,6 +15,7 @@ import 'package:smooth_app/data_models/continuous_scan_model.dart';
 import 'package:smooth_app/database/dao_int.dart';
 import 'package:smooth_app/database/local_database.dart';
 import 'package:smooth_app/generic_lib/design_constants.dart';
+import 'package:smooth_app/generic_lib/dialogs/smooth_alert_dialog.dart';
 import 'package:smooth_app/generic_lib/loading_dialog.dart';
 import 'package:smooth_app/helpers/database_helper.dart';
 import 'package:smooth_app/helpers/image_compute_container.dart';
@@ -243,6 +244,61 @@ class _CropPageState extends State<CropPage> {
   }
 
   Future<File?> _saveFileAndExitTry() async {
+    final AppLocalizations appLocalizations = AppLocalizations.of(context);
+
+    // only for new image upload we have to check the minimum size.
+    if (widget.imageId == null) {
+      // Returns the size of the resulting cropped image.
+      Size getCroppedSize() {
+        switch (_controller.rotation) {
+          case CropRotation.up:
+          case CropRotation.down:
+            return Size(
+              _controller.crop.width * _image.width,
+              _controller.crop.height * _image.height,
+            );
+          case CropRotation.left:
+          case CropRotation.right:
+            return Size(
+              _controller.crop.width * _image.height,
+              _controller.crop.height * _image.width,
+            );
+        }
+      }
+
+      final Size croppedSize = getCroppedSize();
+      if (!BackgroundTaskImage.isPictureBigEnough(
+        croppedSize.width,
+        croppedSize.height,
+      )) {
+        final int width = croppedSize.width.floor();
+        final int height = croppedSize.height.floor();
+        await showDialog<void>(
+          context: context,
+          builder: (BuildContext context) => SmoothAlertDialog(
+            title: appLocalizations.crop_page_too_small_image_title,
+            body: Text(
+              appLocalizations.crop_page_too_small_image_message(
+                BackgroundTaskImage.minimumWidth,
+                BackgroundTaskImage.minimumHeight,
+                width,
+                height,
+              ),
+            ),
+            actionsAxis: Axis.vertical,
+            positiveAction: SmoothActionButton(
+              text: appLocalizations.okay,
+              onPressed: () => Navigator.of(context).pop(),
+            ),
+          ),
+        );
+        return null;
+      }
+    }
+
+    if (!mounted) {
+      return null;
+    }
     final LocalDatabase localDatabase = context.read<LocalDatabase>();
     final DaoInt daoInt = DaoInt(localDatabase);
     final int sequenceNumber =
@@ -255,7 +311,7 @@ class _CropPageState extends State<CropPage> {
     );
 
     setState(
-      () => _progress = AppLocalizations.of(context).crop_page_action_server,
+      () => _progress = appLocalizations.crop_page_action_server,
     );
     if (widget.imageId == null) {
       // in this case, it's a brand new picture, with crop parameters.
@@ -312,21 +368,26 @@ class _CropPageState extends State<CropPage> {
     return croppedFile;
   }
 
-  Future<void> _saveFileAndExit() async {
+  Future<bool> _saveFileAndExit() async {
     setState(
       () => _progress = AppLocalizations.of(context).crop_page_action_saving,
     );
     try {
       final File? file = await _saveFileAndExitTry();
       _progress = null;
-      if (!mounted) {
-        return;
-      }
       if (file == null) {
-        setState(() {});
+        if (mounted) {
+          setState(() {});
+        }
+        return false;
       } else {
-        Navigator.of(context).pop<File>(file);
+        if (mounted) {
+          Navigator.of(context).pop<File>(file);
+        }
+        return true;
       }
+    } catch (e) {
+      return false;
     } finally {
       _progress = null;
     }
@@ -420,8 +481,7 @@ class _CropPageState extends State<CropPage> {
     }
 
     try {
-      await _saveFileAndExit();
-      return true;
+      return _saveFileAndExit();
     } catch (e) {
       if (mounted) {
         // not likely to happen, but you never know...

packages/smooth_app/pubspec.lock

@@ -305,10 +305,10 @@ packages:
     dependency: "direct main"
     description:
       name: crop_image
-      sha256: "0b5b939106eb71cbb66d2b97e56d9ec3469d88b12324143439bf0911e4c9bf11"
+      sha256: "2c70294bdcb0f2fd8b7d660535b314eb5d2477000057e1f30db8295d1588c422"
       url: "https://pub.dev"
     source: hosted
-    version: "1.0.6"
+    version: "1.0.10"
   cross_file:
     dependency: transitive
     description:

packages/smooth_app/pubspec.yaml

@@ -50,7 +50,7 @@ dependencies:
   flutter_native_splash: 2.2.19
   image: ^4.0.17
   auto_size_text: 3.0.0
-  crop_image: 1.0.6
+  crop_image: 1.0.10
   shared_preferences: 2.1.1
   intl: 0.18.0
   collection: 1.17.1