[shared_preferences] allow custom key prefixes - platform changes

packages/shared_preferences/shared_preferences_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.1.0
+
+* Adds `getAllWithPrefix` and `clearWithPrefix` methods.
+
 ## 2.0.17
 
 * Clarifies explanation of endorsement in README.

packages/shared_preferences/shared_preferences_android/android/src/main/java/io/flutter/plugins/sharedpreferences/MethodCallHandlerImpl.java

@@ -106,16 +106,18 @@ public void onMethodCall(MethodCall call, MethodChannel.Result result) {
           // We've been committing the whole time.
           result.success(true);
           break;
-        case "getAll":
-          result.success(getAllPrefs());
+        case "getAllWithPrefix":
+          String prefix = call.argument("prefix");
+          result.success(getAllPrefs(prefix));
           return;
         case "remove":
           commitAsync(preferences.edit().remove(key), result);
           break;
-        case "clear":
-          Set<String> keySet = getAllPrefs().keySet();
+        case "clearWithPrefix":
+          String newPrefix = call.argument("prefix");
+          Set<String> keys = getAllPrefs(newPrefix).keySet();
           SharedPreferences.Editor clearEditor = preferences.edit();
-          for (String keyToDelete : keySet) {
+          for (String keyToDelete : keys) {
             clearEditor.remove(keyToDelete);
           }
           commitAsync(clearEditor, result);
@@ -181,12 +183,12 @@ private String encodeList(List<String> list) throws IOException {
     }
   }
 
-  // Filter preferences to only those set by the flutter app.
-  private Map<String, Object> getAllPrefs() throws IOException {
+  // Gets all shared preferences, filtered to only those set with the given prefix.
+  private Map<String, Object> getAllPrefs(String prefix) throws IOException {
     Map<String, ?> allPrefs = preferences.getAll();
     Map<String, Object> filteredPrefs = new HashMap<>();
     for (String key : allPrefs.keySet()) {
-      if (key.startsWith("flutter.")) {
+      if (key.startsWith(prefix)) {
         Object value = allPrefs.get(key);
         if (value instanceof String) {
           String stringValue = (String) value;

packages/shared_preferences/shared_preferences_android/lib/shared_preferences_android.dart

@@ -19,6 +19,8 @@ class SharedPreferencesAndroid extends SharedPreferencesStorePlatform {
     SharedPreferencesStorePlatform.instance = SharedPreferencesAndroid();
   }
 
+  static const String _defaultPrefix = 'flutter.';
+
   @override
   Future<bool> remove(String key) async {
     return (await _kChannel.invokeMethod<bool>(
@@ -37,17 +39,28 @@ class SharedPreferencesAndroid extends SharedPreferencesStorePlatform {
 
   @override
   Future<bool> clear() async {
-    return (await _kChannel.invokeMethod<bool>('clear'))!;
+    return clearWithPrefix(_defaultPrefix);
+  }
+
+  @override
+  Future<bool> clearWithPrefix(String prefix) async {
+    return (await _kChannel.invokeMethod<bool>(
+      'clearWithPrefix',
+      <String, dynamic>{'prefix': prefix},
+    ))!;
   }
 
   @override
   Future<Map<String, Object>> getAll() async {
-    final Map<String, Object>? preferences =
-        await _kChannel.invokeMapMethod<String, Object>('getAll');
+    return getAllWithPrefix(_defaultPrefix);
+  }
 
-    if (preferences == null) {
-      return <String, Object>{};
-    }
-    return preferences;
+  @override
+  Future<Map<String, Object>> getAllWithPrefix(String prefix) async {
+    return (await _kChannel.invokeMapMethod<String, Object>(
+          'getAllWithPrefix',
+          <String, dynamic>{'prefix': prefix},
+        )) ??
+        <String, Object>{};
   }
 }

packages/shared_preferences/shared_preferences_android/pubspec.yaml

@@ -2,7 +2,7 @@ name: shared_preferences_android
 description: Android implementation of the shared_preferences plugin
 repository: https://github.com/flutter/packages/tree/main/packages/shared_preferences/shared_preferences_android
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+shared_preferences%22
-version: 2.0.17
+version: 2.1.0
 
 environment:
   sdk: ">=2.17.0 <4.0.0"
@@ -20,7 +20,7 @@ flutter:
 dependencies:
   flutter:
     sdk: flutter
-  shared_preferences_platform_interface: ^2.0.0
+  shared_preferences_platform_interface: ^2.2.0
 
 dev_dependencies:
   flutter_test:

packages/shared_preferences/shared_preferences_android/test/shared_preferences_android_test.dart

@@ -16,15 +16,36 @@ void main() {
       'plugins.flutter.io/shared_preferences_android',
     );
 
-    const Map<String, Object> kTestValues = <String, Object>{
+    const Map<String, Object> flutterTestValues = <String, Object>{
       'flutter.String': 'hello world',
       'flutter.Bool': true,
       'flutter.Int': 42,
       'flutter.Double': 3.14159,
       'flutter.StringList': <String>['foo', 'bar'],
     };
-    // Create a dummy in-memory implementation to back the mocked method channel
-    // API to simplify validation of the expected calls.
+
+    const Map<String, Object> prefixTestValues = <String, Object>{
+      'prefix.String': 'hello world',
+      'prefix.Bool': true,
+      'prefix.Int': 42,
+      'prefix.Double': 3.14159,
+      'prefix.StringList': <String>['foo', 'bar'],
+    };
+
+    const Map<String, Object> nonPrefixTestValues = <String, Object>{
+      'String': 'hello world',
+      'Bool': true,
+      'Int': 42,
+      'Double': 3.14159,
+      'StringList': <String>['foo', 'bar'],
+    };
+
+    final Map<String, Object> allTestValues = <String, Object>{};
+
+    allTestValues.addAll(flutterTestValues);
+    allTestValues.addAll(prefixTestValues);
+    allTestValues.addAll(nonPrefixTestValues);
+
     late InMemorySharedPreferencesStore testData;
 
     final List<MethodCall> log = <MethodCall>[];
@@ -45,6 +66,12 @@ void main() {
         if (methodCall.method == 'getAll') {
           return testData.getAll();
         }
+        if (methodCall.method == 'getAllWithPrefix') {
+          final Map<String, Object?> arguments =
+              getArgumentDictionary(methodCall);
+          final String prefix = arguments['prefix']! as String;
+          return testData.getAllWithPrefix(prefix);
+        }
         if (methodCall.method == 'remove') {
           final Map<String, Object?> arguments =
               getArgumentDictionary(methodCall);
@@ -54,6 +81,12 @@ void main() {
         if (methodCall.method == 'clear') {
           return testData.clear();
         }
+        if (methodCall.method == 'clearWithPrefix') {
+          final Map<String, Object?> arguments =
+              getArgumentDictionary(methodCall);
+          final String prefix = arguments['prefix']! as String;
+          return testData.clearWithPrefix(prefix);
+        }
         final RegExp setterRegExp = RegExp(r'set(.*)');
         final Match? match = setterRegExp.matchAsPrefix(methodCall.method);
         if (match?.groupCount == 1) {
@@ -77,14 +110,21 @@ void main() {
 
     test('getAll', () async {
       store = SharedPreferencesAndroid();
-      testData = InMemorySharedPreferencesStore.withData(kTestValues);
-      expect(await store.getAll(), kTestValues);
-      expect(log.single.method, 'getAll');
+      testData = InMemorySharedPreferencesStore.withData(allTestValues);
+      expect(await store.getAll(), flutterTestValues);
+      expect(log.single.method, 'getAllWithPrefix');
+    });
+
+    test('getAllWithPrefix', () async {
+      store = SharedPreferencesAndroid();
+      testData = InMemorySharedPreferencesStore.withData(allTestValues);
+      expect(await store.getAllWithPrefix('prefix.'), prefixTestValues);
+      expect(log.single.method, 'getAllWithPrefix');
     });
 
     test('remove', () async {
       store = SharedPreferencesAndroid();
-      testData = InMemorySharedPreferencesStore.withData(kTestValues);
+      testData = InMemorySharedPreferencesStore.withData(allTestValues);
       expect(await store.remove('flutter.String'), true);
       expect(await store.remove('flutter.Bool'), true);
       expect(await store.remove('flutter.Int'), true);
@@ -102,13 +142,13 @@ void main() {
     test('setValue', () async {
       store = SharedPreferencesAndroid();
       expect(await testData.getAll(), isEmpty);
-      for (final String key in kTestValues.keys) {
-        final Object value = kTestValues[key]!;
+      for (final String key in allTestValues.keys) {
+        final Object value = allTestValues[key]!;
         expect(await store.setValue(key.split('.').last, key, value), true);
       }
-      expect(await testData.getAll(), kTestValues);
+      expect(await testData.getAll(), flutterTestValues);
 
-      expect(log, hasLength(5));
+      expect(log, hasLength(15));
       expect(log[0].method, 'setString');
       expect(log[1].method, 'setBool');
       expect(log[2].method, 'setInt');
@@ -118,11 +158,36 @@ void main() {
 
     test('clear', () async {
       store = SharedPreferencesAndroid();
-      testData = InMemorySharedPreferencesStore.withData(kTestValues);
+      testData = InMemorySharedPreferencesStore.withData(allTestValues);
       expect(await testData.getAll(), isNotEmpty);
       expect(await store.clear(), true);
       expect(await testData.getAll(), isEmpty);
-      expect(log.single.method, 'clear');
+      expect(log.single.method, 'clearWithPrefix');
+    });
+
+    test('clearWithPrefix', () async {
+      store = SharedPreferencesAndroid();
+      testData = InMemorySharedPreferencesStore.withData(allTestValues);
+
+      expect(await testData.getAllWithPrefix('prefix.'), isNotEmpty);
+      expect(await store.clearWithPrefix('prefix.'), true);
+      expect(await testData.getAllWithPrefix('prefix.'), isEmpty);
+    });
+
+    test('getAllWithNoPrefix', () async {
+      store = SharedPreferencesAndroid();
+      testData = InMemorySharedPreferencesStore.withData(allTestValues);
+
+      expect(await testData.getAllWithPrefix(''), hasLength(15));
+    });
+
+    test('clearWithNoPrefix', () async {
+      store = SharedPreferencesAndroid();
+      testData = InMemorySharedPreferencesStore.withData(allTestValues);
+
+      expect(await testData.getAllWithPrefix(''), isNotEmpty);
+      expect(await store.clearWithPrefix(''), true);
+      expect(await testData.getAllWithPrefix(''), isEmpty);
     });
   });
 }

packages/shared_preferences/shared_preferences_foundation/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.2.0
+
+* Adds `getAllWithPrefix` and `clearWithPrefix` methods.
+
 ## 2.1.5
 
 * Clarifies explanation of endorsement in README.

packages/shared_preferences/shared_preferences_foundation/darwin/Classes/SharedPreferencesPlugin.swift

@@ -22,8 +22,8 @@ public class SharedPreferencesPlugin: NSObject, FlutterPlugin, UserDefaultsApi {
     UserDefaultsApiSetup.setUp(binaryMessenger: messenger, api: instance)
   }
 
-  func getAll() -> [String? : Any?] {
-    return getAllPrefs();
+  func getAllWithPrefix(prefix: String) -> [String? : Any?] {
+    return getAllPrefs(prefix: prefix)
   }
 
   func setBool(key: String, value: Bool) {
@@ -42,23 +42,23 @@ public class SharedPreferencesPlugin: NSObject, FlutterPlugin, UserDefaultsApi {
     UserDefaults.standard.removeObject(forKey: key)
   }
 
-  func clear() {
+  func clearWithPrefix(prefix: String) {
     let defaults = UserDefaults.standard
-    for (key, _) in getAllPrefs() {
+    for (key, _) in getAllPrefs(prefix: prefix) {
       defaults.removeObject(forKey: key)
     }
   }
-}
 
-/// Returns all preferences stored by this plugin.
-private func getAllPrefs() -> [String: Any] {
-  var filteredPrefs: [String: Any] = [:]
-  if let appDomain = Bundle.main.bundleIdentifier,
-    let prefs = UserDefaults.standard.persistentDomain(forName: appDomain)
-  {
-    for (key, value) in prefs where key.hasPrefix("flutter.") {
-      filteredPrefs[key] = value
+  /// Returns all preferences stored with specified prefix.
+  func getAllPrefs(prefix: String) -> [String: Any] {
+    var filteredPrefs: [String: Any] = [:]
+    if let appDomain = Bundle.main.bundleIdentifier,
+      let prefs = UserDefaults.standard.persistentDomain(forName: appDomain)
+    {
+      for (key, value) in prefs where key.hasPrefix(prefix) {
+        filteredPrefs[key] = value
+      }
     }
+    return filteredPrefs
   }
-  return filteredPrefs
 }