get actual audio duration (#68)

* get actual audio duration

* add get-audio-duration dependency to package.json

Author: kamnan43

examples/kitchensink/index.js

@@ -315,14 +315,21 @@ function handleAudio(message, replyToken) {
 
   return downloadContent(message.id, downloadPath)
     .then((downloadPath) => {
-      return client.replyMessage(
-        replyToken,
-        {
-          type: 'audio',
-          originalContentUrl: baseURL + '/downloaded/' + path.basename(downloadPath),
-          duration: 1000,
-        }
-      );
+      var getDuration = require('get-audio-duration');
+      var audioDuration;
+      getDuration(downloadPath)
+        .then((duration) => { audioDuration = duration; })
+        .catch((error) => { audioDuration = 1; })
+        .finally(() => {
+          return client.replyMessage(
+            replyToken,
+            {
+              type: 'audio',
+              originalContentUrl: baseURL + '/downloaded/' + path.basename(downloadPath),
+              duration: audioDuration * 1000,
+            }
+          );
+        });
     });
 }
 

package-lock.json

@@ -42,7 +42,8 @@
     "@types/node": "^7.0.31",
     "axios": "^0.16.2",
     "body-parser": "^1.18.2",
-    "file-type": "^7.2.0"
+    "file-type": "^7.2.0",
+    "get-audio-duration": "0.0.1"
   },
   "devDependencies": {
     "@types/express": "^4.0.35",