move sendSignedData to signing_service file

Author: AlaaElattar

app/lib/screens/signing/signing_mixin.dart

@@ -1,7 +1,5 @@
-import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:http/http.dart' as http;
 import 'package:threebotlogin/models/wallet.dart';
 import 'package:threebotlogin/helpers/logger.dart';
 import 'package:threebotlogin/services/signing_service.dart';
@@ -41,7 +39,26 @@ mixin SigningMixin<T extends StatefulWidget> on State<T> {
       );
       final destinationUrl = destUrlController.text.trim();
       if (destinationUrl.isNotEmpty) {
-        await sendSignedData(destinationUrl, signedData!);
+        final success = await sendSignedData(destinationUrl, signedData!);
+        if (mounted) {
+          ScaffoldMessenger.of(context).showSnackBar(
+            SnackBar(
+              content: Text(
+                success
+                    ? 'Signature sent successfully'
+                    : 'Failed to send signature to destination',
+                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                      color: success
+                          ? Theme.of(context).colorScheme.onPrimaryContainer
+                          : Theme.of(context).colorScheme.onErrorContainer,
+                    ),
+              ),
+              backgroundColor: success
+                  ? Theme.of(context).colorScheme.primary
+                  : Theme.of(context).colorScheme.error,
+            ),
+          );
+        }
       }
     } catch (e) {
       logger.e('Failed to sign data: $e');
@@ -113,43 +130,6 @@ mixin SigningMixin<T extends StatefulWidget> on State<T> {
     }
   }
 
-  Future<void> sendSignedData(String destUrl, String signature) async {
-    try {
-      final response = await http.post(
-        Uri.parse(destUrl),
-        headers: {'Content-Type': 'application/json'},
-        body: json.encode({'signature': signature}),
-      );
-
-      if (response.statusCode != 200) {
-        throw Exception('Failed to send signature to destination');
-      }
-
-      if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(
-            content: Text('Signature sent successfully',
-                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                    color: Theme.of(context).colorScheme.onPrimaryContainer)),
-            backgroundColor: Theme.of(context).colorScheme.primary,
-          ),
-        );
-      }
-    } catch (e) {
-      logger.e('Error sending signature to destination: $e');
-      if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(
-            content: Text('Failed to send signature to destination',
-                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                    color: Theme.of(context).colorScheme.onErrorContainer)),
-            backgroundColor: Theme.of(context).colorScheme.error,
-          ),
-        );
-      }
-    }
-  }
-
   Widget buildWalletSelector(List<Wallet> wallets) {
     return Column(
       crossAxisAlignment: CrossAxisAlignment.stretch,

app/lib/services/signing_service.dart

@@ -1,9 +1,30 @@
 import 'package:crypto/crypto.dart';
+import 'package:threebotlogin/helpers/logger.dart';
 import 'package:threebotlogin/services/tfchain_service.dart';
+import 'package:http/http.dart' as http;
+import 'dart:convert';
 
 Future<String> md5Sign(
     {required String data, required String walletSecretSeed}) async {
   final contentHash = md5.convert(data.codeUnits).toString();
   final signer = await getSignerFromSeed(walletSecretSeed);
   return signer.sign(contentHash);
 }
+
+Future<bool> sendSignedData(String destUrl, String signature) async {
+  try {
+    final response = await http.post(
+      Uri.parse(destUrl),
+      headers: {'Content-Type': 'application/json'},
+      body: json.encode({'signature': signature}),
+    );
+
+    if (response.statusCode != 200) {
+      throw Exception('Failed to send signature to destination');
+    }
+    return true;
+  } catch (e) {
+    logger.e('Error sending signature to destination: $e');
+    return false;
+  }
+}