Ignore UserComment in EXIF

lib/entity/exif.dart

@@ -30,7 +30,9 @@ class Exif with EquatableMixin {
 
   JsonObj toJson() {
     return Map.fromEntries(
-      data.entries.where((e) => e.key != "MakerNote").map((e) {
+      data.entries
+          .where((e) => e.key != "MakerNote" && e.key != "UserComment")
+          .map((e) {
         dynamic jsonValue;
         if (e.value is Rational) {
           jsonValue = e.value.toJson();
@@ -55,7 +57,10 @@ class Exif with EquatableMixin {
       // we are filtering out MakerNote here because it's generally very large
       // and could exceed the 1MB cursor size limit on Android. Second, the
       // content is proprietary and thus useless to us anyway
-      json.entries.where((e) => e.key != "MakerNote").map((e) {
+      // UserComment is now also ignored as its size could be very large
+      json.entries
+          .where((e) => e.key != "MakerNote" && e.key != "UserComment")
+          .map((e) {
         dynamic exifValue;
         if (e.value is Map) {
           exifValue = Rational.fromJson(e.value.cast<String, dynamic>());

test/entity/exif_test.dart

@@ -111,6 +111,13 @@ void main() {
         });
         expect(exif.toJson(), <String, dynamic>{});
       });
+
+      test("UserComment", () {
+        final exif = Exif(<String, dynamic>{
+          "UserComment": Uint8List.fromList([0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF]),
+        });
+        expect(exif.toJson(), <String, dynamic>{});
+      });
     });
 
     group("fromJson", () {
@@ -175,6 +182,13 @@ void main() {
         };
         expect(Exif.fromJson(json), Exif(<String, dynamic>{}));
       });
+
+      test("UserComment", () {
+        final json = <String, dynamic>{
+          "UserComment": [1],
+        };
+        expect(Exif.fromJson(json), Exif(<String, dynamic>{}));
+      });
     });
   });
 }