YouTube OAuth Bash

oauth.sh

#!/bin/bash
#YouTube OAuth authentication for shell-based YT-tools like youtube-dl
#by untergrundbiber 2014

#You need to register a app to obtaining clientId and clientSecret.
#https://developers.google.com/youtube/registering_an_application
#You can find the right scope here: https://developers.google.com/oauthplayground/

#--- Settings ---
clientId="000000000000.apps.googleusercontent.com"
clientSecret="ABC"
scope="youtube"
#----------------

dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
tokenfile="$dir/authtoken"

function getCode {
  echo "Please go to:"
  echo
  echo "https://accounts.google.com/o/oauth2/auth?client_id=$clientId&redirect_uri=urn:ietf:wg:oauth:2.0:oob&scope=https://www.googleapis.com/auth/$scope&response_type=code"
  echo
  echo "after accepting, enter the code you are given:"
  read code
}

function getAuthToken {
	getCode
	local cmd="curl https://accounts.google.com/o/oauth2/token --silent \
		--request POST --header \"Content-Type: application/x-www-form-urlencoded\"\
		-d client_id=$clientId -d client_secret=$clientSecret -d code=$code \
		-d redirect_uri=urn:ietf:wg:oauth:2.0:oob -d grant_type=authorization_code"
	local authResponse=$($cmd)
	access_token=$(echo $authResponse | awk -F"," '{print $1}' | awk -F":" '{print $2}' | sed s/\"//g | tr -d ' ')
	refresh_token=$(echo $authResponse | awk -F"," '{print $4}' | awk -F":" '{print $2}' | sed s/\"//g | sed s/}// | tr -d ' ')
	echo access_token , $access_token > $tokenfile
	echo refresh_token , $refresh_token >> $tokenfile
	#echo authResponse: $authResponse
	echo access_token: $access_token
	echo refresh_token: $refresh_token
}

function refreshAuthToken {
	local cmd="curl https://accounts.google.com/o/oauth2/token --silent \
		--request POST --header \"Content-Type: application/x-www-form-urlencoded\"\
		-d client_id=$clientId -d client_secret=$clientSecret -d refresh_token=$refresh_token \
		-d grant_type=refresh_token"
	local refreshResponse=$($cmd)
	access_token=$(echo $refreshResponse | awk -F"," '{print $1}' | awk -F":" '{print $2}' | sed s/\"//g | tr -d ' ')
	echo access_token , $access_token > $tokenfile
	echo refresh_token , $refresh_token >> $tokenfile
	#echo refreshResponse: $authResponse
	echo access_token: $access_token
	echo refresh_token: $refresh_token
	
}

function payload {
echo "Executing payload..."
#Put your payload here
#wget "http://gdata.youtube.com/feeds/api/users/USERNAME/newsubscriptionvideos?prettyprint=true&fields=entry(link[@rel='alternate'](@href))" --header "Authorization: OAuth $access_token" -O "ytsubs"
}

if [ -s $tokenfile ];then
	access_token=$(cat $tokenfile | grep access_token | awk -F"," '{print $2}' | tr -d ' ')
	refresh_token=$(cat $tokenfile | grep refresh_token | awk -F"," '{print $2}' | tr -d ' ')
else
	echo "Token-file not found. Getting new token..."
 	getAuthToken
fi

EXPIRED=$(curl -s https://www.googleapis.com/oauth2/v1/tokeninfo?access_token=$access_token | grep 'invalid_token')
if [ "$EXPIRED" ]       
then
	echo "AuthToken expired. Refreshing...."
	refreshAuthToken
else
	echo "AuthToken valid."
	validResponse=$(curl -s https://www.googleapis.com/oauth2/v1/tokeninfo?access_token=$access_token)
	expires_in=`echo $validResponse | sed 's/\\\\\//\//g' | sed 's/[{}]//g' | awk -v k="text" '{n=split($0,a,","); for (i=1; i<=n; i++) print a[i]}' | sed 's/\"\:\"/\|/g' | sed 's/[\,]/ /g' | sed 's/\"//g' | grep -w expires_in| cut -d":" -f2| sed -e 's/^ *//g' -e 's/ *$//g'`
	echo "Token expires on:" `date --date "$expires_in sec" +"%x - %T"`
	payload
fi

I'm having a problem if the token expires I get the following error which also then populates the authtoken file. Has anyone else seen this?

access_token , invalid_grant
refresh_token , https