[tekartik_app_media] extensionFromMimeType

.github/dependabot.yml

@@ -57,6 +57,10 @@ updates:
     directory: "app_lints"
     schedule:
       interval: "monthly"
+  - package-ecosystem: "pub"
+    directory: "app_media"
+    schedule:
+      interval: "monthly"
   - package-ecosystem: "pub"
     directory: "app_mirrors"
     schedule:

app_media/lib/mime_type.dart

@@ -1 +1,2 @@
+export 'src/mapping.dart' show extensionFromMimeType;
 export 'src/mime_type_constant.dart';

app_media/lib/src/mapping.dart

@@ -0,0 +1,13 @@
+import 'package:tekartik_app_media/mime_type.dart';
+
+const _mimeTypeExtensions = {
+  mimeTypeApplicationJson: extensionApplicationJson,
+  mimeTypeImageJpg: extensionImageJpg,
+  mimeTypeImagePng: extensionImagePng,
+  mimeTypeImageWebp: extensionImageWebp,
+};
+
+/// Get the extension from a mime type
+String? extensionFromMimeType(String mimeType) {
+  return _mimeTypeExtensions[mimeType];
+}

app_media/lib/src/mime_type_constant.dart

@@ -1,2 +1,23 @@
 /// Mime type for application/json
 const mimeTypeApplicationJson = 'application/json';
+
+/// Extension for json
+const extensionApplicationJson = '.json';
+
+/// Mime type for jpg
+const mimeTypeImageJpg = 'image/jpeg';
+
+/// Extension for jpg
+const extensionImageJpg = '.jpg';
+
+/// Mime type for png
+const mimeTypeImagePng = 'image/png';
+
+/// Extension for jpg
+const extensionImagePng = '.png';
+
+/// Mime type for webp
+const mimeTypeImageWebp = 'image/webp';
+
+/// Extension for webp
+const extensionImageWebp = '.webp';

app_media/pubspec.yaml

@@ -1,5 +1,5 @@
 name: tekartik_app_media
-description: Media type constants
+description: Media type constants and helpers
 version: 1.0.0
 publish_to: none
 

app_media/test/mime_type_test.dart

@@ -5,8 +5,28 @@ void main() {
   group('mime_type', () {
     test('constants', () {
       // Ensure it is a const
-      const types = [mimeTypeApplicationJson];
-      expect(types, ['application/json']);
+      const types = [
+        mimeTypeApplicationJson,
+        mimeTypeImagePng,
+        mimeTypeImageJpg,
+        mimeTypeImageWebp
+      ];
+      expect(
+          types, ['application/json', 'image/png', 'image/jpeg', 'image/webp']);
+      const extensions = [
+        extensionApplicationJson,
+        extensionImagePng,
+        extensionImageJpg,
+        extensionImageWebp,
+      ];
+      expect(extensions, ['.json', '.png', '.jpg', '.webp']);
+    });
+    test('extensionFromMimeType', () {
+      expect(extensionFromMimeType(mimeTypeApplicationJson),
+          extensionApplicationJson);
+      expect(extensionFromMimeType(mimeTypeImagePng), extensionImagePng);
+      expect(extensionFromMimeType(mimeTypeImageJpg), extensionImageJpg);
+      expect(extensionFromMimeType(mimeTypeImageWebp), extensionImageWebp);
     });
   });
 }