WP RSS Images with filters

<?php
/*
Plugin Name: WP RSS Images
Plugin URI: http://web-argument.com/wp-rss-images-wordpress-plugin/
Description: Add feature images to your blog rss.
Version: 1.1-Filters
Author: Alain Gonzalez
Author URI: http://web-argument.com/
*/

function wp_rss_img_get_options($default = false){
    $rss_img_default_op = array(
                                        "size"=>"thumbnail",
                                        "rss"=>0,
                                        "rss2"=>1,
                                        "media"=>0,
                                        "enclosure"=>1,
                                        "version"=>"1.1"
    );

    if ($default) {
    update_option('wp_rss_img_op', $rss_img_default_op);
    return $rss_img_default_op;
    }

    $options = get_option('wp_rss_img_op');
    if (isset($options)){
        if (isset($options['version'])) {
            $chk_version = version_compare("1.1",$options['version']);
            if ($chk_version == 0)  return $options;
            else if ($chk_version > 0) $options = $rss_img_default_op;
        } else {
        $options = $rss_img_default_op;
        }
    }
    update_option('wp_rss_img_op', $options);
    return $options;
}

add_action('admin_menu', 'wp_rss_img_menu');
add_action("do_feed_rss","wp_rss_img_do_feed",5,1);
add_action("do_feed_rss2","wp_rss_img_do_feed",5,1);

function wp_rss_img_do_feed($for_comments){
    if(!$for_comments) {
        $options = wp_rss_img_get_options();
        if($options['media']) add_action('rss2_ns', 'wp_rss_img_adding_yahoo_media_tag');
        if ($options['rss'])  add_action('rss_item', 'wp_rss_img_include');
        if ($options['rss2'])  add_action('rss2_item', 'wp_rss_img_include');
    }
}

function wp_rss_img_include (){
    $options = wp_rss_img_get_options();
    $media = $options['media'];
    $enclosure = $options['enclosure'];
    $image_size = $options['size'];

    $image_url = wp_rss_img_url($image_size);

    if (!empty($image_url) && ($enclosure || $media)) {

        $uploads = wp_upload_dir();
        $url = parse_url($image_url);
        $path = $uploads['basedir'] . preg_replace( '/.*uploads(.*)/', '${1}', $url['path'] );

        if ( file_exists( $path ) )
        {
          $filesize = filesize( $path );
          $url = $path;

        } else {
            $ary_header = get_headers($image_url, 1);
            $filesize = $ary_header['Content-Length'];
            $url = $image_url;
        }

        if($enclosure) echo '<enclosure url="' . $image_url . '" length="' . $filesize . '" type="image/jpg" />';
        if($media){
                list($width, $height, $type, $attr) = getimagesize($url);
                echo '<media:content url="'.$image_url.'" width="'.$width.'" height="'.$height.'" medium="image" type="'.image_type_to_mime_type($type).'" />';
        }

    }

}

function wp_rss_img_adding_yahoo_media_tag(){

    echo 'xmlns:media="http://search.yahoo.com/mrss/"';

}

/**
 * Returns a URL to an image in the user uploads directory on this server.
 *
 * Developers can hook the wp_rss_image_alternative filter to provide their
 * own image URL on this server, or hook the wp_rss_image_size filter to
 * provide a specific size for the featured_image.
 *
 * @param string $size Defaults to medium, a WordPress image size added with add_image_size
 * @return string The URL to an image on this server
 */
function wp_rss_img_url($size = 'medium') {
    global $post;
    if ( $img_url = apply_filters( 'wp_rss_image_alternative', false, $post->ID ) ) {
        return $img_url;
    } else if( function_exists ('has_post_thumbnail') && has_post_thumbnail($post->ID)) {
        $thumbnail_id = get_post_thumbnail_id( $post->ID );
        $size = apply_filters( 'wp_rss_image_size', 'medium', $post->ID );
        if(!empty($thumbnail_id))
            $img = wp_get_attachment_image_src( $thumbnail_id, $size );
        error_log( "SW: IMG: " . print_r( $img, true ) );
    } else {
        $attachments = get_children( array(
                                            'post_parent' => $post->ID,
                                            'post_type' => 'attachment',
                                            'post_mime_type' => 'image',
                                            'orderby' => 'menu_order',
                                            'order' => 'ASC',
                                            'numberposts' => 1) );
        if($attachments == true) {
            foreach($attachments as $id => $attachment) :
                $img = wp_get_attachment_image_src($id, $size);
            endforeach;
        }

    }
    if (isset($img)) return $img[0];
}



function wp_rss_img_menu() {
    add_options_page('WP RSS Images', 'WP RSS Images', 'administrator', 'wp-rss-image', 'wp_rss_image_setting');
}



function wp_rss_image_setting() {

    $options = wp_rss_img_get_options();

    if(isset($_POST['Submit'])){
        $newoptions = array();
        $newoptions['media'] = isset ($_POST['media'])? $_POST['media']: 0;
        $newoptions['enclosure'] = isset ($_POST['enclosure'])? $_POST['enclosure']: 0;
        $newoptions['rss'] = isset ($_POST['rss'])? $_POST['rss']: 0;
        $newoptions['rss2'] = isset ($_POST['rss2'])? $_POST['rss2']: 0;
        $newoptions['size'] = isset ($_POST['size'])? $_POST['size']: $options['size'];
        $newoptions['version'] = $options['version'];

        if ( $options != $newoptions ) {
            $options = $newoptions;
            update_option('wp_rss_img_op', $options);
?>
         <div class="updated"><p><strong><?php _e('Options saved.', 'mt_trans_domain' ); ?></strong></p></div>
<?php  }  ?>
<?php  }

    $media = $options['media'];
    $enclosure = $options['enclosure'];
    $rss = $options['rss'];
    $rss2 = $options['rss2'];
    $image_size = $options['size'];
    $version = $options['version'];

?>

<div class="wrap">

<form method="post" name="options" target="_self">

<h2><?php _e("WP RSS Images Setting") ?></h2>
<h3><?php _e("Select the size of the images") ?></h3>
<p><?php _e("The plugin uses the Posts feature images or the first image added to the post gallery. You can change the dimension of this sizes under Settings/ Media.") ?></p>
<table width="100%" cellpadding="10" class="form-table">

  <tr valign="top">
    <td width="200" align="right">
      <input type="radio" name="size" id="radio" value="thumbnail" <?php if ($image_size == 'thumbnail') echo "checked=\"checked\"";?>/>
    </td>
    <td align="left" scope="row"><?php _e("Thumbnail") ?></td>
  </tr>
  <tr valign="top">
    <td width="200" align="right">
     <input name="size" type="radio" id="radio" value="medium" <?php if ($image_size == 'medium') echo "checked=\"checked\"";?> />
     </td>
    <td align="left" scope="row"><?php _e("Medium Size") ?></td>
  </tr>
  <tr valign="top">
    <td width="200" align="right">
     <input type="radio" name="size" id="radio" value="full" <?php if ($image_size == 'full') echo "checked=\"checked\"";?>/>
     </td>
    <td align="left" scope="row"><?php _e("Full Size") ?></td>
  </tr>
</table>

<h3> <?php _e("Apply to: ") ?></h3>
<table width="100%" cellpadding="10" class="form-table">
  <tr valign="top">
    <td width="200" align="right"><input name="rss" type="checkbox" id="rss" value="1"
    <?php if ($rss) echo "checked" ?> /></td>
    <td align="left" scope="row"><?php _e("RSS") ?>   <a href="<?php echo get_bloginfo('rss_url'); ?> " title="<?php bloginfo('name'); ?> - rss" target="_blank"><?php echo get_bloginfo('rss_url'); ?> </a> </td>
  </tr>
  <tr valign="top">
    <td width="200" align="right"><input name="rss2" type="checkbox" id="rss2" value="1"
    <?php if ($rss2)  echo "checked" ?> /></td>
    <td align="left" scope="row"><?php _e("RSS 2") ?>    <a href="<?php echo get_bloginfo('rss2_url'); ?> " title="<?php bloginfo('name'); ?> - rss2" target="_blank"><?php echo get_bloginfo('rss2_url'); ?> </a> </td>
  </tr>
</table>

<h3> <?php _e("Include: ") ?></h3>
<table width="100%" cellpadding="10" class="form-table">
  <tr valign="top">
    <td width="200" align="right"><input name="enclosure" type="checkbox" value="1"
    <?php if ($enclosure) echo "checked" ?> /></td>
    <td align="left" scope="row"><?php _e("Enclosure Tag") ?></td>
  </tr>
  <tr valign="top">
    <td width="200" align="right"><input name="media" type="checkbox" value="1"
    <?php if ($media)  echo "checked" ?> /></td>
    <td align="left" scope="row"><?php _e("Media Tag") ?></td>
  </tr>
</table>

<p class="submit">
<input type="submit" name="Submit" value="<?php _e("Update") ?>" />
</p>

</form>
</div>

<?php }  ?>