#!/usr/bin/php
<?php

  // Define our Access Key Id, and Secret Access Key.
  define('ACCESS_KEY_ID','xxxxxxxxxxxxxxxxxxxx');
  define('SECRET_ACCESS_KEY','xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx');

  // Downloads the next document from PDF Alchemy.
  // Returns the documentId on success, or false on failure.
  function downloadNext() {
    // Generate the HMAC signature.
    $date=gmdate("D, d M Y H:i:s T");
    $request='/'.ACCESS_KEY_ID.'/outqueue/next';
    $clearText="GET\n".ACCESS_KEY_ID."\n$date\n$request";
    $signature=base64_encode(hash_hmac('sha1',$clearText,SECRET_ACCESS_KEY,true));

    // Request the next document from PDF Alchemy.
    $headers=array('Date'=>$date, 'X-PDF-Alchemy-Signature'=>$signature);
    $options=array('headers'=>$headers);
    $response=http_request(HTTP_METH_GET,"http://www.pdfalchemy.com$request",null,$options,$info);
    if ($response===false)
      error_log('http_request returned false.');
    else if ($info['response_code']==0)
      error_log('http_request returned response_code 0 - probably timed out.');
    else if ($info['response_code']>=300)
      error_log("Failed to get next download: $response");
    else {
      // Get the filename.
      $headers=explode("\r\n",substr($response,0,strpos($response,"\r\n\r\n")));
      foreach ($headers as $header) {
        $header=explode(': ',$header);
        if ($header[0]=='Content-Disposition')
          $filename=ereg_replace('.*filename="(.*)".*','\1',$header[1]);
        else if ($header[0]=='X-PDF-Alchemy-ID')
          $documentId=$header[1];
      }
      if (!isset($filename))
        error_log("Failed to find filename in Content-Disposition header.");
      else {
        // Write the file.
        $filename=basename($filename);
        $data=(substr($response,strpos($response,"\r\n\r\n")+4));
        file_put_contents($filename,$data);
        print "Downloaded '$filename'.\n";
        return (isset($documentId)) ? $documentId : false;
      }
    }
    return false;
  }

  // Removes documentId from the PDF Alchemy outqueue.
  function deleteDocument($documentId) {
    // Generate the HMAC signature.
    $date=gmdate("D, d M Y H:i:s T");
    $request='/'.ACCESS_KEY_ID.'/outqueue/'.urlencode(basename($documentId));
    $clearText="DELETE\n".ACCESS_KEY_ID."\n$date\n$request";
    $signature=base64_encode(hash_hmac('sha1',$clearText,SECRET_ACCESS_KEY,true));

    // Remove the document from PDF Alchemy.
    $headers=array('Date'=>$date, 'X-PDF-Alchemy-Signature'=>$signature);
    $options=array('headers'=>$headers);
    $response=http_request(HTTP_METH_DELETE,"http://www.pdfalchemy.com$request",null,$options,$info);
    if ($response===false)
      error_log('http_request returned false.');
    else if ($info['response_code']==0)
      error_log('http_request returned response_code 0 - probably timed out.');
    else if ($info['response_code']>=300)
      error_log("Failed to delete document: $response");
    else
      print("Removed '$documentId' from PDF Alchemy.\n");
  }

  // Download the next file, and remove it from PDF Alchemy.
  while (($documentId=downloadNext())!==false)
    deleteDocument($documentId);

?>