1 files changed, 75 insertions, 0 deletions
diff --git a/frontend/lib/utils/uri_utility.dart b/frontend/lib/utils/uri_utility.dart
new file mode 100644
index 000000000..ace65f082
--- /dev/null
+++ b/frontend/lib/utils/uri_utility.dart
@@ -0,0 +1,75 @@
+import 'package:http/http.dart' as http;
+import 'dart:convert';
+
+class UriUtility {
+  static bool isURL(String url) {
+    // Validate if the URL string is empty, or contains spaces or invalid characters
+    if (url.isEmpty || RegExp(r'[\s<>]').hasMatch(url)) {
+      print('URL is either empty or contains spaces/invalid characters.');
+      return false;
+    }
+
+    // Check for 'mailto:' at the start of the URL
+    if (url.startsWith('mailto:')) {
+      print('URL starts with "mailto:".');
+      return false;
+    }
+
+    // Try to parse the URL, return false if parsing fails
+    Uri? uri;
+    try {
+      uri = Uri.parse(url);
+    } catch (e) {
+      print('URL parsing failed: $e');
+      return false;
+    }
+
+    // Validate the URL has a scheme (protocol) and host
+    if (uri.scheme.isEmpty || uri.host.isEmpty) {
+      print('URL is missing a scheme (protocol) or host.');
+      return false;
+    }
+
+    // Check if the URI has user info, which is not a common case for a valid HTTP/HTTPS URL
+    if (uri.hasAuthority &&
+        uri.userInfo.contains(':') &&
+        uri.userInfo.split(':').length > 2) {
+      print('URL contains invalid user info.');
+      return false;
+    }
+
+    // Validate the port number if exists
+    if (uri.hasPort && (uri.port <= 0 || uri.port > 65535)) {
+      print('URL contains an invalid port number.');
+      return false;
+    }
+
+    print('URL is valid.');
+    return true;
+  }
+
+  Future<bool> isValidGitHubRepo(String repoUrl) async {
+    var uri = Uri.parse(repoUrl);
+    if (uri.host != 'github.com') {
+      return false;
+    }
+
+    var segments = uri.pathSegments;
+    if (segments.length < 2) {
+      return false;
+    }
+
+    var user = segments[0];
+    var repo = segments[1];
+
+    var apiUri = Uri.https('api.github.com', '/repos/$user/$repo');
+
+    var response = await http.get(apiUri);
+    if (response.statusCode != 200) {
+      return false;
+    }
+
+    var data = json.decode(response.body);
+    return data is Map && data['full_name'] == '$user/$repo';
+  }
+}