Auto Save Remote Images WP Plugin

auto-save-remote-images.php

<?php
/*
Plugin Name: Auto Save Remote Image
Plugin URI: http://www.devsaab.com/wordpress/
Description: This plugin automatically downloads the first remote image from a post and sets it as the featured image.
Version: 1.3
Author: Prebhdev Singh
Disclaimer: No warranty or guarantee of any kind!  Use this in your own risk.
*/
add_action('publish_post', 'fetch_images');

function fetch_images( $post_ID )
{
  //Check to make sure function is not executed more than once on save
  if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
  return;

  if ( !current_user_can('edit_post', $post_ID) )
  return;

  remove_action('publish_post', 'fetch_images');

  $post = get_post($post_ID);

  $image = '';

  if(preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches)){
    foreach($matches[1] as $image) {
      print($image);

      if (strpos($image,$_SERVER['HTTP_HOST'])===false)
      {

        preg_match_all('/([0-9]{4}\/[0-9]{2})\//i', $image, $matches);
        $date = $matches [1] [0];

        //Fetch and Store the Image
        $get = wp_remote_head( $image );
        $type = wp_remote_retrieve_header( $get, 'content-type' );
        $mirror = wp_upload_bits(rawurldecode(basename( $image )), '', '', $date);

        //Attachment options
        $attachment = array(
        'post_title'=> basename( $image ),
        'post_mime_type' => $type
        );

        // Add the image to your media library and set as featured image
        $attach_id = wp_insert_attachment( $attachment, $mirror['file'], $post_ID );
        $attach_data = wp_generate_attachment_metadata( $attach_id, $image );
        wp_update_attachment_metadata( $attach_id, $attach_data );
        set_post_thumbnail( $post_ID, $attach_id );

        $post->post_content = str_replace($image, $mirror['url'], $post->post_content);
      }
    }
  }

  //Replace the image in the post
  wp_update_post(array('ID' => $post_ID, 'post_content' => $post->post_content));

  // re-hook this function
  add_action('publish_post', 'fetch_images');
}
?>