feat: added case for the extension to validate the file (#807)

Co-authored-by: Aayush <[email protected]>%0ACo-authored-by: souvik <[email protected]>

src/errors/specification-file.ts

@@ -24,7 +24,7 @@ export class SpecificationURLNotFound extends SpecificationFileError {
   }
 }
 
-type From = 'file' | 'url' | 'context'
+type From = 'file' | 'url' | 'context' | 'invalid file'
 
 export class ErrorLoadingSpec extends Error {
   private readonly errorMessages = {
@@ -35,14 +35,18 @@ export class ErrorLoadingSpec extends Error {
     if (from === 'file') {
       this.name = 'error loading AsyncAPI document from file';
       this.message = `${param} file does not exist.`;
-    }
+    } 
     if (from === 'url') {
       this.name = 'error loading AsyncAPI document from url';
       this.message = `Failed to download ${param}.`;
-    }
+    } 
     if (from === 'context') {
       this.name = 'error loading AsyncAPI document from context';
       this.message = `${param} context name does not exist.`;
+    } 
+    if (from === 'invalid file') {
+      this.name = 'Invalid AsyncAPI file type';
+      this.message = 'cli only supports yml ,yaml ,json extension';
     }
 
     if (!from) {

src/models/SpecificationFile.ts

@@ -185,6 +185,15 @@ export async function fileExists(name: string): Promise<boolean> {
     if ((await lstat(name)).isFile()) {
       return true;
     }
+
+    const extension = name.split('.')[1];
+
+    const allowedExtenstion=['yml','yaml','json'];
+
+    if (!allowedExtenstion.includes(extension)) {
+      throw new ErrorLoadingSpec('invalid file',name);
+    }
+
     throw new ErrorLoadingSpec('file', name);
   } catch (e) {
     throw new ErrorLoadingSpec('file', name);