sebdeveloper6952 · haorendashu · May 8, 2025 · May 8, 2025 · May 8, 2025 · May 9, 2025
diff --git a/README.md b/README.md
@@ -35,6 +35,8 @@ _Get Public Key_
 
 Get the current user public key (npub). This request also allows to send permissions so the user can approve them forever. See the [Amber Docs](https://github.com/greenart7c3/Amber/blob/master/README.md) for the list of available permissions.
 
+The ```Get Public Key``` function, like a connect function, can set permissions and get the package name of android signer. You should call it first when you use android signer.
+
 ```
 final amber = Amberflutter();
 
@@ -45,6 +47,7 @@ amber.getPublicKey(
     ),
   ],
 ).then((value) {
+  print("package: ${value['package']}");
   print("npub: ${value['signature']}");
 });
 ```
@@ -67,6 +70,7 @@ final eventJson = jsonEncode({
 amber.signEvent(
   currentUser: "<your_npub_here>",
   eventJson: eventJson,
+  package: "<android_signer's_package_name(optional)>",
 ).then((value) {
   print("signed event: ${value['event']}");
 });
@@ -81,6 +85,7 @@ amber.nip04Encrypt(
   plaintext: "Hello from Amber Flutter, Nip 04!",
   currentUser: "<your_npub_here>",
   pubKey: "<hex_pubkey_to_encrypt>",
+  package: "<android_signer's_package_name(optional)>",
 ).then((value) {
   print("ciphertext: ${value['signature']}")
 });
@@ -93,6 +98,7 @@ amber.nip44Encrypt(
   plaintext: "Hello from Amber Flutter, Nip 44!",
   currentUser: "<your_npub_here>",
   pubKey: "<hex_pubkey_to_encrypt>",
+  package: "<android_signer's_package_name(optional)>",
 ).then((value) {
   print("ciphertext: ${value['signature']}")
 });
@@ -107,6 +113,7 @@ amber.nip04Decrypt(
   ciphertext: "<message_encrypted_with_nip04_here>",
   currentUser: "<your_npub_here>",
   pubKey: "<hex_pubkey_to_decrypt>",
+  package: "<android_signer's_package_name(optional)>",
 ).then((value) {
   print("plaintext: ${value['signature']}")
 });
@@ -121,6 +128,7 @@ amber.nip44Decrypt(
   ciphertext: "<message_encrypted_with_nip44_here>",
   currentUser: "<your_npub_here>",
   pubKey: "<hex_pubkey_to_decrypt>",
+  package: "<android_signer's_package_name(optional)>",
 ).then((value) {
   print("plaintext: ${value['signature']}")
 });

diff --git a/android/src/main/AndroidManifest.xml b/android/src/main/AndroidManifest.xml
@@ -1,6 +1,10 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.sebdeveloper6952.amberflutter.amberflutter">
   <queries>
-    <package android:name="com.greenart7c3.nostrsigner"/>
+    <intent>
+      <action android:name="android.intent.action.VIEW" />
+      <category android:name="android.intent.category.BROWSABLE" />
+      <data android:scheme="nostrsigner" />
+    </intent>
   </queries>
 </manifest>
diff --git a/android/src/main/kotlin/com/sebdeveloper6952/amberflutter/amberflutter/AmberflutterPlugin.kt b/android/src/main/kotlin/com/sebdeveloper6952/amberflutter/amberflutter/AmberflutterPlugin.kt
@@ -41,6 +41,16 @@ class AmberflutterPlugin: FlutterPlugin, MethodCallHandler, ActivityAware, Plugi
     return context.packageManager.getInstalledApplications(0).find { info -> info.packageName == target } != null
   }
 
+  fun isAndroidSignerInstalled(context: Context): Boolean {
+    val intent =
+      Intent().apply {
+        action = Intent.ACTION_VIEW
+        data = Uri.parse("nostrsigner:")
+      }
+    val infos = context.packageManager.queryIntentActivities(intent, 0)
+    return infos.size > 0
+  }
+
   override fun onMethodCall(call: MethodCall, result: Result) {
     if (call.method == nostrsignerUri) {
       _result = MethodResultWrapper(result)
@@ -61,8 +71,18 @@ class AmberflutterPlugin: FlutterPlugin, MethodCallHandler, ActivityAware, Plugi
       val id = paramsMap[intentExtraKeyId] as? String ?: ""
       val uriData = paramsMap[intentExtraKeyUriData] as? String ?: ""
       val permissions = paramsMap[intentExtraKeyPermissions] as? String ?: ""
+      val packageName = (paramsMap[intentExtraKeyPackage] as? String)?.let { originalPackage ->
+        if (originalPackage.isNotEmpty()) {
+            originalPackage
+        } else if (requestType != "get_public_key") {
+            amberPackageName
+        } else {
+            ""
+        }
+    } ?: if (requestType != "get_public_key") amberPackageName else ""
 
      val data = getDataFromContentResolver(
+       packageName,
        requestType.uppercase(),
        arrayOf(uriData, pubKey, currentUser),
        _context.contentResolver,
@@ -78,7 +98,11 @@ class AmberflutterPlugin: FlutterPlugin, MethodCallHandler, ActivityAware, Plugi
         Uri.parse(
           "$nostrsignerUri:$uriData"
         )
-      )
+      ).apply {
+        if (!packageName.isNullOrEmpty()) {
+          setPackage(packageName)
+        }
+      }
 
       intent.putExtra(intentExtraKeyType, requestType)
       intent.putExtra(intentExtraKeyCurrentUser, currentUser)
@@ -102,6 +126,9 @@ class AmberflutterPlugin: FlutterPlugin, MethodCallHandler, ActivityAware, Plugi
         var packageName: String? = paramsMap["packageName"] as? String ?: return
         val isInstalled: Boolean = isPackageInstalled(_context, packageName!!)
         result.success(isInstalled);
+    } else if (call.method == "isAndroidSignerInstalled") {
+      val isInstalled: Boolean = isAndroidSignerInstalled(_context)
+      result.success(isInstalled);
     } else {
       result.notImplemented()
     }
@@ -123,6 +150,10 @@ class AmberflutterPlugin: FlutterPlugin, MethodCallHandler, ActivityAware, Plugi
           val event = intent.getStringExtra(intentExtraKeyEvent)
           dataMap[intentExtraKeyEvent] = event
         }
+        if (intent.hasExtra(intentExtraKeyPackage)) {
+          val packageName = intent.getStringExtra(intentExtraKeyPackage)
+          dataMap[intentExtraKeyPackage] = packageName
+        }
 
         _result.success(dataMap)
 
@@ -159,13 +190,14 @@ class AmberflutterPlugin: FlutterPlugin, MethodCallHandler, ActivityAware, Plugi
     Code taken from: https://github.com/0xchat-app/nostr-dart/blob/main/android/src/main/kotlin/com/oxchat/nostrcore/ChatcorePlugin.kt
    */
   private fun getDataFromContentResolver(
+    packageName: String,
     type: String,
     uriData: Array<out String>,
     resolver: ContentResolver,
   ): HashMap<String, String?>? {
     try {
       resolver.query(
-        Uri.parse("content://${amberPackageName}.$type"),
+        Uri.parse("content://${packageName}.$type"),
         uriData,
         null,
         null,

diff --git a/android/src/main/kotlin/com/sebdeveloper6952/amberflutter/amberflutter/models/Amber.kt b/android/src/main/kotlin/com/sebdeveloper6952/amberflutter/amberflutter/models/Amber.kt
@@ -10,4 +10,5 @@ const val intentExtraKeyId = "id"
 const val intentExtraKeyEvent = "event"
 const val intentExtraKeyPubKey = "pubKey"
 const val intentExtraKeyPermissions = "permissions"
-const val intentExtraKeyUriData = "uri_data"
+const val intentExtraKeyUriData = "uri_data"
+const val intentExtraKeyPackage = "package"
diff --git a/example/lib/main.dart b/example/lib/main.dart
@@ -31,6 +31,7 @@ class MyHomePage extends StatefulWidget {
 
 class _MyHomePageState extends State<MyHomePage> {
   final amber = Amberflutter();
+  String _package = '';
   String _npub = '';
   String _pubkeyHex = '';
   String _text = '';
@@ -48,6 +49,16 @@ class _MyHomePageState extends State<MyHomePage> {
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
+            FilledButton(
+              onPressed: () {
+                amber.isAndroidSignerInstalled().then((value) {
+                  setState(() {
+                    _text = 'isAndroidSignerInstalled? $value';
+                  });
+                });
+              },
+              child: const Text('IsAndroidSignerInstall ?'),
+            ),
             FilledButton(
               onPressed: () {
                 amber.getPublicKey(
@@ -60,6 +71,7 @@ class _MyHomePageState extends State<MyHomePage> {
                     ),
                   ],
                 ).then((value) {
+                  _package = value['package'] ?? '';
                   _npub = value['signature'] ?? '';
                   _pubkeyHex = Nip19.decodePubkey(_npub);
                   setState(() {
@@ -86,6 +98,7 @@ class _MyHomePageState extends State<MyHomePage> {
                     .signEvent(
                   currentUser: _npub,
                   eventJson: eventJson,
+                  package: _package,
                 )
                     .then((value) {
                   setState(() {
@@ -102,6 +115,7 @@ class _MyHomePageState extends State<MyHomePage> {
                   plaintext: "Hello from Amber Flutter, Nip 04!",
                   currentUser: _npub,
                   pubKey: _pubkeyHex,
+                  package: _package,
                 )
                     .then((value) {
                   _cipherText = value['signature'] ?? '';
@@ -119,6 +133,7 @@ class _MyHomePageState extends State<MyHomePage> {
                   ciphertext: _cipherText,
                   currentUser: _npub,
                   pubKey: _pubkeyHex,
+                  package: _package,
                 )
                     .then((value) {
                   setState(() {
@@ -135,6 +150,7 @@ class _MyHomePageState extends State<MyHomePage> {
                   plaintext: "Hello from Amber Flutter, Nip 44!",
                   currentUser: _npub,
                   pubKey: _pubkeyHex,
+                  package: _package,
                 )
                     .then((value) {
                   _cipherText = value['signature'] ?? '';
@@ -152,6 +168,7 @@ class _MyHomePageState extends State<MyHomePage> {
                   ciphertext: _cipherText,
                   currentUser: _npub,
                   pubKey: _pubkeyHex,
+                  package: _package,
                 )
                     .then((value) {
                   setState(() {

diff --git a/lib/amberflutter.dart b/lib/amberflutter.dart
@@ -16,15 +16,21 @@ class Amberflutter {
     return AmberflutterPlatform.instance.isAppInstalled();
   }
 
+  Future<bool> isAndroidSignerInstalled() {
+    return AmberflutterPlatform.instance.isAndroidSignerInstalled();
+  }
+
   Future<Map<dynamic, dynamic>> signEvent({
     required String currentUser,
     required String eventJson,
     String? id,
+    String? package,
   }) {
     return AmberflutterPlatform.instance.signEvent(
       currentUser,
       eventJson,
       id,
+      package: package ?? "",
     );
   }
 
@@ -33,12 +39,14 @@ class Amberflutter {
     required String currentUser,
     required String pubKey,
     String? id,
+    String? package,
   }) {
     return AmberflutterPlatform.instance.nip04Encrypt(
       plaintext,
       currentUser,
       pubKey,
       id,
+      package: package ?? "",
     );
   }
 
@@ -47,12 +55,14 @@ class Amberflutter {
     required String currentUser,
     required String pubKey,
     String? id,
+    String? package,
   }) {
     return AmberflutterPlatform.instance.nip04Decrypt(
       ciphertext,
       currentUser,
       pubKey,
       id,
+      package: package ?? "",
     );
   }
 
@@ -61,12 +71,14 @@ class Amberflutter {
     required String currentUser,
     required String pubKey,
     String? id,
+    String? package,
   }) {
     return AmberflutterPlatform.instance.nip44Encrypt(
       plaintext,
       currentUser,
       pubKey,
       id,
+      package: package ?? "",
     );
   }
 
@@ -75,24 +87,28 @@ class Amberflutter {
     required String currentUser,
     required String pubKey,
     String? id,
+    String? package,
   }) {
     return AmberflutterPlatform.instance.nip44Decrypt(
       ciphertext,
       currentUser,
       pubKey,
       id,
+      package: package ?? "",
     );
   }
 
   Future<Map<dynamic, dynamic>> decryptZapEvent({
     required String eventJson,
     required String currentUser,
     String? id,
+    String? package,
   }) {
     return AmberflutterPlatform.instance.decryptZapEvent(
       eventJson,
       currentUser,
       id,
+      package: package ?? "",
     );
   }
 }