fix STT.js

@@ -11,7 +11,14 @@ const apiReq = async ( clientData ) => {
     //let audiodata = fs.readFileSync('./audio/audio_input.mp3').toString('base64')
     console.log(Buffer(clientData.audio,'base64'))
     
+
+    let getSTT = {};
+    try {
         getSTT = await apiRequest.ETRI( "WiseASR/Recognition", { "language_code" : "korean", "audio" : audiodata } );
+    }
+    catch ( err ) {
+        throw new Error ( err.message );
+    }
 
     return { "text" : getSTT.return_object.recognized };
 }
@@ -20,8 +27,31 @@ const STT = async ( req, res ) => {
     let clientData,
         voiceTemp;
 
+    try {
         clientData = req.body.data
+        if( !clientData.audio.length ) {
+            throw new Error( "client audio empty" );
+        }
+        else if( !isBase64( clientData.audio ) ) {
+            throw new Error( "Type error : audio type should be base64" );
+        }
+    }
+    catch( err ) {
+        console.log( err );
+        res.json( { "return_code" : -1, "error_code" : err.message } );
+        res.status( 403 );
+        return false;
+    }
+    
+    try {
         voiceTemp = await apiReq( clientData );
+    }
+    catch( err ) {
+        console.log( err );
+        res.json( { "return_code" : -1, "error_code" : err.message } );
+        res.status( 502 );
+        return false;
+    }
     
     res.send( { "return_code" : 0, "return_data" : voiceTemp } );
     res.status( 200 );