PHP: Dropbox Token Expired or Does not exist - php

Question

I am trying to copy a file from localhost to Dropbox account , i'm using curl to generate the token once i get the token i'm using it to upload the file but i'm getting error saying either Token Expired or Does not exist.
Here is my code:
## step1.php ##
<?php
session_start();
require_once('config.php');
$step_2_url = rawurlencode("http://nuftp.com/sanjeev/step-2.php");
$ch = curl_init();
$headers = array( 'Authorization: OAuth oauth_version="1.0",
oauth_signature_method="PLAINTEXT", oauth_consumer_key="' . $app_key . '",
oauth_signature="' . $app_secret . '&"' );
curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch, CURLOPT_URL,
"https://api.dropbox.com/1/oauth/request_token" );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, TRUE );
$request_token_response = curl_exec( $ch );
error_log(var_export($request_token_response,true));
parse_str( $request_token_response, $parsed_request_token );
$json_access = json_decode( $request_token_response );
if ( isset( $json_access->error ) ) {
echo '<br><br>FATAL ERROR: ' . $json_access->error . '<br><br>';
die();
}
$_SESSION['myapp'] = array();
$_SESSION['myapp']['oauth_request_token'] =
$parsed_request_token['oauth_token'];
$_SESSION['myapp']['oauth_request_token_secret'] =
$parsed_request_token['oauth_token_secret'];
header( 'Location: https://www.dropbox.com/1/oauth/authorize?oauth_token='
. $parsed_request_token['oauth_token'] . '&oauth_callback=' . $step_2_url );
## step2.php ##
<?php
session_start();
require_once('config.php');
include 'dropbox-sdk-php-1.1.4/lib/Dropbox/autoload.php';
use \Dropbox as dbx;
$step_3_url = "step-3.php";
if ( isset( $_GET['oauth_token'] ) && isset( $_GET['uid'] ) && isset(
$_SESSION['myapp'] ) ) {
$ch = curl_init();
$headers = array( 'Authorization: OAuth oauth_version="1.0",
oauth_signature_method="PLAINTEXT", oauth_consumer_key="' . $app_key .
'", oauth_token="' .$_GET['oauth_token'] . '", oauth_signature="' .
$app_secret . '&' . $_SESSION['myapp']['oauth_request_token_secret'] . '"'
);
curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch, CURLOPT_URL,
"https://api.dropbox.com/1/oauth/access_token" );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, TRUE );
$access_token_response = curl_exec( $ch );
error_log(var_export($request_token_response,true));
parse_str( $access_token_response, $parsed_access_token );
error_log( $access_token_response );
$json_access = json_decode( $access_token_response );
if ( isset( $json_access->error ) ) {
echo '<br><br>FATAL ERROR: ' . $json_access->error . '<br><br>';
die();
}
$_SESSION['myapp']['uid'] = $parsed_access_token['uid'];
$_SESSION['myapp']['oauth_access_token'] =
$parsed_access_token['oauth_token'];
$_SESSION['myapp']['oauth_access_token_secret'] =
$parsed_access_token['oauth_token_secret'];
$dbxClient = new dbx\Client($_GET['oauth_token'], "PHP-Example/1.0");
$accountInfo = $dbxClient->getAccountInfo();
print_r($accountInfo);
$f = fopen("working-draft.txt", "rb");
$result = $dbxClient->uploadFile("/working-draft.txt",
dbx\WriteMode::add(), $f);
fclose($f);
print_r($result);
$folderMetadata = $dbxClient->getMetadataWithChildren("/");
print_r($folderMetadata);
$f = fopen("working-draft.txt", "w+b");
$fileMetadata = $dbxClient->getFile("/working-draft.txt", $f);
fclose($f);
print_r($fileMetadata);
}
Somebody please suggest me what to do and where am i going wrong.

Answer 1

I managed to get another working code and it works absolutely fine. It performs upload and download of files on dropbox. you can get the working code from the link below, however in the code i'm manually changing the names of the files to upload instead of holding it in a variable or giving an option to choose the file from directory.
In case there is any query , comment here and also revert me back on sanjeevks101#gmail.com
Also go through the instructions page first before actually testing the code.
http://www.filehosting.org/file/details/471563/AccessDropboxUsingPHP-master.rar