root/branches/2.1/wp-admin/admin-ajax.php

<?php
require_once('../wp-config.php');
require_once('admin-functions.php');
require_once('admin-db.php');

define('DOING_AJAX', true);

check_ajax_referer();
if ( !is_user_logged_in() )
    die('-1');

function get_out_now() { exit; }
add_action( 'shutdown', 'get_out_now', -1 );

function wp_ajax_meta_row( $pid, $mid, $key, $value ) {
    $value = attribute_escape($value);
    $key_js = addslashes(wp_specialchars($key, 'double'));
    $key = attribute_escape($key);
    $r .= "<tr id='meta-$mid'><td valign='top'>";
    $r .= "<input name='meta[$mid][key]' tabindex='6' onkeypress='return killSubmit(\"theList.ajaxUpdater(&#039;meta&#039;,&#039;meta-$mid&#039;);\",event);' type='text' size='20' value='$key' />";
    $r .= "</td><td><textarea name='meta[$mid][value]' tabindex='6' rows='2' cols='30'>$value</textarea></td><td align='center'>";
    $r .= "<input name='updatemeta' type='button' class='updatemeta' tabindex='6' value='".attribute_escape(__('Update'))."' onclick='return theList.ajaxUpdater(&#039;meta&#039;,&#039;meta-$mid&#039;);' /><br />";
    $r .= "<input name='deletemeta[$mid]' type='submit' onclick=\"return deleteSomething( 'meta', $mid, '";
    $r .= js_escape(sprintf(__("You are about to delete the '%s' custom field on this post.\n'OK' to delete, 'Cancel' to stop."), $key_js));
    $r .= "' );\" class='deletemeta' tabindex='6' value='".attribute_escape(__('Delete'))."' /></td></tr>";
    return $r;
}

$id = (int) $_POST['id'];
switch ( $_POST['action'] ) :
case 'delete-comment' :
    if ( !$comment = get_comment( $id ) )
        die('0');
    if ( !current_user_can( 'edit_post', $comment->comment_post_ID ) )
        die('-1');

    if ( wp_delete_comment( $comment->comment_ID ) )
        die('1');
    else    die('0');
    break;
case 'delete-comment-as-spam' :
    if ( !$comment = get_comment( $id ) )
        die('0');
    if ( !current_user_can( 'edit_post', $comment->comment_post_ID ) )
        die('-1');

    if ( wp_set_comment_status( $comment->comment_ID, 'spam' ) )
        die('1');
    else    die('0');
    break;
case 'delete-cat' :
    if ( !current_user_can( 'manage_categories' ) )
        die('-1');

    if ( wp_delete_category( $id ) )
        die('1');
    else    die('0');
    break;
case 'delete-link' :
    if ( !current_user_can( 'manage_links' ) )
        die('-1');

    if ( wp_delete_link( $id ) )
        die('1');
    else    die('0');
    break;
case 'delete-meta' :
    if ( !$meta = get_post_meta_by_id( $id ) )
        die('0');
    if ( !current_user_can( 'edit_post', $meta->post_id ) )
        die('-1');
    if ( delete_meta( $meta->meta_id ) )
        die('1');
    die('0');
    break;
case 'delete-post' :
    if ( !current_user_can( 'delete_post', $id ) )
        die('-1');

    if ( wp_delete_post( $id ) )
        die('1');
    else    die('0');
    break;
case 'delete-page' :
    if ( !current_user_can( 'delete_page', $id ) )
        die('-1');

    if ( wp_delete_post( $id ) )
        die('1');
    else    die('0');
    break;
case 'dim-comment' :
    if ( !$comment = get_comment( $id ) )
        die('0');
    if ( !current_user_can( 'edit_post', $comment->comment_post_ID ) )
        die('-1');
    if ( !current_user_can( 'moderate_comments' ) )
        die('-1');

    if ( 'unapproved' == wp_get_comment_status($comment->comment_ID) ) {
        if ( wp_set_comment_status( $comment->comment_ID, 'approve' ) )
            die('1');
    } else {
        if ( wp_set_comment_status( $comment->comment_ID, 'hold' ) )
            die('1');
    }
    die('0');
    break;
case 'add-category' : // On the Fly
    if ( !current_user_can( 'manage_categories' ) )
        die('-1');
    $names = explode(',', $_POST['newcat']);
    $x = new WP_Ajax_Response();
    foreach ( $names as $cat_name ) {
        $cat_name = trim($cat_name);
        if ( !$category_nicename = sanitize_title($cat_name) )
            die('0');
        if ( !$cat_id = category_exists( $cat_name ) )
            $cat_id = wp_create_category( $cat_name );
        $cat_name = wp_specialchars(stripslashes($cat_name));
        $x->add( array(
            'what' => 'category',
            'id' => $cat_id,
            'data' => "<li id='category-$cat_id'><label for='in-category-$cat_id' class='selectit'><input value='$cat_id' type='checkbox' checked='checked' name='post_category[]' id='in-category-$cat_id'/> $cat_name</label></li>"
        ) );
    }
    $x->send();
    break;
case 'add-cat' : // From Manage->Categories
    if ( !current_user_can( 'manage_categories' ) )
        die('-1');
    if ( !$cat = wp_insert_category( $_POST ) )
        die('0');
    if ( !$cat = get_category( $cat ) )
        die('0');
    $level = 0;
    $cat_full_name = $cat->cat_name;
    $_cat = $cat;
    while ( $_cat->category_parent ) {
        $_cat = get_category( $_cat->category_parent );
        $cat_full_name = $_cat->cat_name . ' &#8212; ' . $cat_full_name;
        $level++;
    }
    $cat_full_name = attribute_escape($cat_full_name);

    $x = new WP_Ajax_Response( array(
        'what' => 'cat',
        'id' => $cat->cat_ID,
        'data' => _cat_row( $cat, $level, $cat_full_name ),
        'supplemental' => array('name' => $cat_full_name, 'show-link' => sprintf(__( 'Category <a href="#%s">%s</a> added' ), "cat-$cat->cat_ID", $cat_full_name))
    ) );
    $x->send();
    break;
case 'add-meta' :
    if ( !current_user_can( 'edit_post', $id ) )
        die('-1');
    if ( $id < 0 ) {
        $now = current_time('timestamp', 1);
        if ( $pid = wp_insert_post( array(
            'post_title' => sprintf('Draft created on %s at %s', date(get_option('date_format'), $now), date(get_option('time_format'), $now))
        ) ) )
            $mid = add_meta( $pid );
        else
            die('0');
    } else if ( !$mid = add_meta( $id ) ) {
        die('0');
    }

    $meta = get_post_meta_by_id( $mid );
    $key = $meta->meta_key;
    $value = $meta->meta_value;
    $pid = (int) $meta->post_id;

    $x = new WP_Ajax_Response( array(
        'what' => 'meta',
        'id' => $mid,
        'data' => wp_ajax_meta_row( $pid, $mid, $key, $value ),
        'supplemental' => array('postid' => $pid)
    ) );
    $x->send();
    break;
case 'update-meta' :
    $mid = (int) array_pop(array_keys($_POST['meta']));
    $key = $_POST['meta'][$mid]['key'];
    $value = $_POST['meta'][$mid]['value'];
    if ( !$meta = get_post_meta_by_id( $mid ) )
        die('0'); // if meta doesn't exist
    if ( !current_user_can( 'edit_post', $meta->post_id ) )
        die('-1');
    if ( $u = update_meta( $mid, $key, $value ) ) {
        $key = stripslashes($key);
        $value = stripslashes($value);
        $x = new WP_Ajax_Response( array(
            'what' => 'meta',
            'id' => $mid,
            'data' => wp_ajax_meta_row( $meta->post_id, $mid, $key, $value ),
            'supplemental' => array('postid' => $meta->post_id)
        ) );
        $x->send();
    }
    die('1'); // We know meta exists; we also know it's unchanged (or DB error, in which case there are bigger problems).
    break;
case 'add-user' :
    if ( !current_user_can('edit_users') )
        die('-1');
    require_once(ABSPATH . WPINC . '/registration.php');
    if ( !$user_id = add_user() )
        die('0');
    elseif ( is_wp_error( $user_id ) ) {
        foreach( $user_id->get_error_messages() as $message )
            echo "<p>$message<p>";
        exit;
    }
    $user_object = new WP_User( $user_id );
    $x = new WP_Ajax_Response( array(
        'what' => 'user',
        'id' => $user_id,
        'data' => user_row( $user_object ),
        'supplemental' => array('show-link' => sprintf(__( 'User <a href="#%s">%s</a> added' ), "user-$user_id", $user_object->user_login))
    ) );
    $x->send();
    break;
case 'autosave' : // The name of this action is hardcoded in edit_post()
    $_POST['post_content'] = $_POST['content'];
    $_POST['post_excerpt'] = $_POST['excerpt'];
    $_POST['post_status'] = 'draft';
    $_POST['post_category'] = explode(",", $_POST['catslist']);
    if($_POST['post_type'] == 'page' || empty($_POST['post_category']))
        unset($_POST['post_category']);    
    
    if($_POST['post_ID'] < 0) {
        $_POST['temp_ID'] = $_POST['post_ID'];
        $id = wp_write_post();
        if( is_wp_error($id) )
            die($id->get_error_message());
        else
            die("$id");
    } else {
        $post_ID = (int) $_POST['post_ID'];
        $_POST['ID'] = $post_ID;
        $post = get_post($post_ID);
        if ( 'page' == $post->post_type ) {
            if ( !current_user_can('edit_page', $post_ID) )
                die(__('You are not allowed to edit this page.'));
        } else {
            if ( !current_user_can('edit_post', $post_ID) )
                die(__('You are not allowed to edit this post.'));
        }
        wp_update_post($_POST);
    }
    die('0');
break;
case 'autosave-generate-nonces' :
    $ID = (int) $_POST['post_ID'];
    if($_POST['post_type'] == 'post') {
        if(current_user_can('edit_post', $ID))
            die(wp_create_nonce('update-post_' . $ID));
    }
    if($_POST['post_type'] == 'page') {
        if(current_user_can('edit_page', $ID)) {
            die(wp_create_nonce('update-page_' . $ID));
        }
    }
    die($_POST['post_type']);
break;
default :
    do_action( 'wp_ajax_' . $_POST['action'] );
    die('0');
    break;
endswitch;
?>