Can I get an email notification when media is uploaded to the media library?

Question

I have a front end uploader for members only, utilizing this code:

<?php
function insert_attachment_form($postID) {
?>
<form id="file-form" name="file-form" method="POST" action="" enctype="multipart/form-data" >
    <input type="file" id="async-upload" name="async-upload" />
    <input type="hidden" name="postID" value="<?php echo $postID; ?>" />
    <?php wp_nonce_field('client-file-upload', 'client-file-upload'); ?>
    <input type="submit" value="Upload" id="submit" name="submit" />
</form>
<?php } 

function process_attachment() {
// verify this came from the our screen and with proper authorization,
// because save_post can be triggered at other times
if ( !wp_verify_nonce( $_POST['client-file-upload'], 'client-file-upload') ) {
    return $post->ID;
}

// Is the user allowed to edit the post or page?
if ( !current_user_can( 'publish_posts', $post->ID ))
    return $post->ID;

if( 'POST' == $_SERVER['REQUEST_METHOD'] && !empty( $_FILES )) {
    require_once(ABSPATH . 'wp-admin/includes/admin.php');
    $id = media_handle_upload('async-upload', $_POST['postID']);
    unset($_FILES);
}
}?>

Ideally I would like to have the drag-and-drop WordPress file uploader here, or at the very least, a progress indicator. But I digress (though, bonus points if you can lead me toward that) - This is going to be an area where clients upload files for us. I need an email to be generated somehow along with this, to an admin. Any ideas?

Answer 1

Yes, yes you can

You will need to hook into the add_attachment action, though there are others that may be more appropriate. Then you grab the list of administrators and send an email.

Here is a sample plugin I created for you:

<?php
/*
Plugin Name: Notify on Attachment Creation
Plugin URI: http://www.tomjn.com
Description: Send a notification when an attachment is created
Version: 1.03
Author: Tom J Nowell
Author URI: http://www.tomjn.com
*/


function new_attachment_email($att_id){
    $recipients = array();

    // who should it be sent to?

    global $wpdb;
    $key = $wpdb->prefix."user_level";
    $admins = $wpdb->get_results($wpdb->prepare("SELECT user_id from $wpdb->usermeta AS um WHERE um.meta_key ='". $key."' AND um.meta_value = 10"));

    if(!empty($admins)){
        foreach($admins as $admin){
            $userdata = get_userdata($admin->user_id);
            $recipients[] = $userdata->user_email;
        }
    } else {
        wp_die('nicht');
    }

    if(is_multisite()){
        $superadmins = get_super_admins();
        if(!empty($superadmins)){
            foreach($superadmins as $superadmin){
                $u = get_userdatabylogin($superadmin);
                if($u != false){
                    if(!in_array($u->user_email,$recipients)){
                        $recipients[] = $u->user_email;
                    }
                }
            }
        }
    }

    // send the email
    if(empty($recipients)){
        // there is nobody to send this to? Abort!
        wp_die('oh dear god');
        return;
    }
    $admin_email = get_option('admin_email');
    $headers= "From:$admin_email\r\n";
    $headers .= "Reply-To:$admin_email\r\n";
    $headers .= "X-Mailer: PHP/".phpversion()."\r\n";
    $headers .= "content-type: text/html";

    $subject = 'New Attachment upload';
    $template = '<p>new attachment uploaded to WordPress with the ID: '.$att_id.'.</p>'. wp_get_attachment_link( $att_id,'',true,false,'click here to view this attachment' );
    foreach($recipients as $to){
        @wp_mail($to, $subject, $template, $headers);
    }
}
add_action('add_attachment','new_attachment_email',1,1);

This will send an email to the administrators and super admins of a wordpress site/network when a new attachment is created.