Add "Missing SESSION_TOKEN" exception.

src/youtube-studio-api.js

@@ -381,6 +381,21 @@ async function getEndScreen(videoId) {
 
 
 async function upload(options) {
+ // 
+ // @tyzesc
+ // 
+ // Fix GitHub issue #21
+ // https://github.com/adasq/youtube-studio/issues/21
+ // 
+ // Missing SESSION_TOKEN will make YouTube return 401 Unauthorized Error,
+ // and uploadFile pass null value to node-fetch and will cause error.
+ // 
+ if (typeof sessionToken !== 'string' || sessionToken.length === 0) {
+ throw {
+ text: 'Missing SESSION_TOKEN on init will cause Unauthorized Request. Please check your SESSION_TOKEN is set correctly in init function.'
+ }
+ }
+
  return uploadFile(options, headers, config, sessionToken)
 }
 
@@ -619,4 +634,4 @@ module.exports = {
  setInfoCards,
  getVideoClaims,
  upload
-}
+}