fix: GitHub URL parsing and file extension detection for issue #1940

- Fix GitHub URL regex to support branch names with slashes (e.g., feature/new-validation)
- Fix file extension detection to handle files with multiple dots (e.g., my.asyncapi.yaml) using path.extname()

Closes #1940

Author: mini

src/domains/models/SpecificationFile.ts

@@ -237,7 +237,8 @@ export async function fileExists(name: string): Promise<boolean> {
       return true;
     }
 
-    const extension = name.split('.')[1];
+    // Use path.extname to correctly handle files with multiple dots (e.g., my.asyncapi.yaml)
+    const extension = path.extname(name).slice(1);
 
     const allowedExtenstion = ['yml', 'yaml', 'json'];
 

src/domains/services/validation.service.ts

@@ -69,8 +69,9 @@ const convertGitHubWebUrl = (url: string): string => {
   const urlWithoutFragment = url.split('#')[0];
 
   // Handle GitHub web URLs like: https://github.com/owner/repo/blob/branch/path
+  // Note: branch name can contain slashes (e.g., feature/new-validation)
   // eslint-disable-next-line no-useless-escape
-  const githubWebPattern = /^https:\/\/github\.com\/([^\/]+)\/([^\/]+)\/blob\/([^\/]+)\/(.+)$/;
+  const githubWebPattern = /^https:\/\/github\.com\/([^\/]+)\/([^\/]+)\/blob\/(.+)\/([^\/]+)$/;
   const match = urlWithoutFragment.match(githubWebPattern);
 
   if (match) {