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<?php
/**
* Send XML response back to Ajax request.
*
* @package WordPress
* @since 2.1.0
*/
class WP_Ajax_Response {
/**
* Store XML responses to send.
*
* @since 2.1.0
* @var array
*/
public $responses = array();
/**
* Constructor - Passes args to WP_Ajax_Response::add().
*
* @since 2.1.0
* @see WP_Ajax_Response::add()
*
* @param string|array $args Optional. Will be passed to add() method.
*/
public function __construct( $args = '' ) {
if ( ! empty( $args ) ) {
$this->add( $args );
}
}
/**
* Appends data to an XML response based on given arguments.
*
* With `$args` defaults, extra data output would be:
*
* <response action='{$action}_$id'>
* <$what id='$id' position='$position'>
* <response_data><![CDATA[$data]]></response_data>
* </$what>
* </response>
*
* @since 2.1.0
*
* @param string|array $args {
* Optional. An array or string of XML response arguments.
*
* @type string $what XML-RPC response type. Used as a child element of `<response>`.
* Default 'object' (`<object>`).
* @type string|false $action Value to use for the `action` attribute in `<response>`. Will be
* appended with `_$id` on output. If false, `$action` will default to
* the value of `$_POST['action']`. Default false.
* @type int|WP_Error $id The response ID, used as the response type `id` attribute. Also
* accepts a `WP_Error` object if the ID does not exist. Default 0.
* @type int|false $old_id The previous response ID. Used as the value for the response type
* `old_id` attribute. False hides the attribute. Default false.
* @type string $position Value of the response type `position` attribute. Accepts 1 (bottom),
* -1 (top), html ID (after), or -html ID (before). Default 1 (bottom).
* @type string|WP_Error $data The response content/message. Also accepts a WP_Error object if the
* ID does not exist. Default empty.
* @type array $supplemental An array of extra strings that will be output within a `<supplemental>`
* element as CDATA. Default empty array.
* }
* @return string XML response.
*/
public function add( $args = '' ) {
$defaults = array(
'what' => 'object',
'action' => false,
'id' => '0',
'old_id' => false,
'position' => 1,
'data' => '',
'supplemental' => array(),
);
$r = wp_parse_args( $args, $defaults );
$position = preg_replace( '/[^a-z0-9:_-]/i', '', $r['position'] );
$id = $r['id'];
$what = $r['what'];
$action = $r['action'];
$old_id = $r['old_id'];
$data = $r['data'];
if ( is_wp_error( $id ) ) {
$data = $id;
$id = 0;
}
$response = '';
if ( is_wp_error( $data ) ) {
foreach ( (array) $data->get_error_codes() as $code ) {
$response .= "<wp_error code='$code'><![CDATA[" . $data->get_error_message( $code ) . ']]></wp_error>';
if ( ! $error_data = $data->get_error_data( $code ) ) {
continue;
}
$class = '';
if ( is_object( $error_data ) ) {
$class = ' class="' . get_class( $error_data ) . '"';
$error_data = get_object_vars( $error_data );
}
$response .= "<wp_error_data code='$code'$class>";
if ( is_scalar( $error_data ) ) {
$response .= "<![CDATA[$error_data]]>";
} elseif ( is_array( $error_data ) ) {
foreach ( $error_data as $k => $v ) {
$response .= "<$k><![CDATA[$v]]></$k>";
}
}
$response .= '</wp_error_data>';
}
} else {
$response = "<response_data><![CDATA[$data]]></response_data>";
}
$s = '';
if ( is_array( $r['supplemental'] ) ) {
foreach ( $r['supplemental'] as $k => $v ) {
$s .= "<$k><![CDATA[$v]]></$k>";
}
$s = "<supplemental>$s</supplemental>";
}
if ( false === $action ) {
$action = $_POST['action'];
}
$x = '';
$x .= "<response action='{$action}_$id'>"; // The action attribute in the xml output is formatted like a nonce action
$x .= "<$what id='$id' " . ( false === $old_id ? '' : "old_id='$old_id' " ) . "position='$position'>";
$x .= $response;
$x .= $s;
$x .= "</$what>";
$x .= '</response>';
$this->responses[] = $x;
return $x;
}
/**
* Display XML formatted responses.
*
* Sets the content type header to text/xml.
*
* @since 2.1.0
*/
public function send() {
header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ) );
echo "<?xml version='1.0' encoding='" . get_option( 'blog_charset' ) . "' standalone='yes'?><wp_ajax>";
foreach ( (array) $this->responses as $response ) {
echo $response;
}
echo '</wp_ajax>';
if ( wp_doing_ajax() ) {
wp_die();
} else {
die();
}
}
}
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