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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* Manages the rendering of pages in PMA
*
* @package PhpMyAdmin
*/
namespace PMA\libraries;
/**
* Singleton class used to manage the rendering of pages in PMA
*
* @package PhpMyAdmin
*/
class Response
{
/**
* Response instance
*
* @access private
* @static
* @var Response
*/
private static $_instance;
/**
* Header instance
*
* @access private
* @var Header
*/
private $_header;
/**
* HTML data to be used in the response
*
* @access private
* @var string
*/
private $_HTML;
/**
* An array of JSON key-value pairs
* to be sent back for ajax requests
*
* @access private
* @var array
*/
private $_JSON;
/**
* PMA\libraries\Footer instance
*
* @access private
* @var Footer
*/
private $_footer;
/**
* Whether we are servicing an ajax request.
* We can't simply use $GLOBALS['is_ajax_request']
* here since it may have not been initialised yet.
*
* @access private
* @var bool
*/
private $_isAjax;
/**
* Whether response object is disabled
*
* @access private
* @var bool
*/
private $_isDisabled;
/**
* Whether we are servicing an ajax request for a page
* that was fired using the generic page handler in JS.
*
* @access private
* @var bool
*/
private $_isAjaxPage;
/**
* Whether there were any errors during the processing of the request
* Only used for ajax responses
*
* @access private
* @var bool
*/
private $_isSuccess;
/**
* Workaround for PHP bug
*
* @access private
* @var string|bool
*/
private $_CWD;
/**
* Creates a new class instance
*/
private function __construct()
{
if (! defined('TESTSUITE')) {
$buffer = OutputBuffering::getInstance();
$buffer->start();
register_shutdown_function(array('PMA\libraries\Response', 'response'));
}
$this->_header = new Header();
$this->_HTML = '';
$this->_JSON = array();
$this->_footer = new Footer();
$this->_isSuccess = true;
$this->_isAjax = false;
$this->_isAjaxPage = false;
$this->_isDisabled = false;
if (isset($_REQUEST['ajax_request']) && $_REQUEST['ajax_request'] == true) {
$this->_isAjax = true;
}
if (isset($_REQUEST['ajax_page_request'])
&& $_REQUEST['ajax_page_request'] == true
) {
$this->_isAjaxPage = true;
}
$this->_header->setAjax($this->_isAjax);
$this->_footer->setAjax($this->_isAjax);
$this->_CWD = getcwd();
}
/**
* Returns the singleton Response object
*
* @return Response object
*/
public static function getInstance()
{
if (empty(self::$_instance)) {
self::$_instance = new Response();
}
return self::$_instance;
}
/**
* Set the status of an ajax response,
* whether it is a success or an error
*
* @param bool $state Whether the request was successfully processed
*
* @return void
*/
public function setRequestStatus($state)
{
$this->_isSuccess = ($state == true);
}
/**
* Returns true or false depending on whether
* we are servicing an ajax request
*
* @return bool
*/
public function isAjax()
{
return $this->_isAjax;
}
/**
* Returns the path to the current working directory
* Necessary to work around a PHP bug where the CWD is
* reset after the initial script exits
*
* @return string
*/
public function getCWD()
{
return $this->_CWD;
}
/**
* Disables the rendering of the header
* and the footer in responses
*
* @return void
*/
public function disable()
{
$this->_header->disable();
$this->_footer->disable();
$this->_isDisabled = true;
}
/**
* Returns a PMA\libraries\Header object
*
* @return Header
*/
public function getHeader()
{
return $this->_header;
}
/**
* Returns a PMA\libraries\Footer object
*
* @return Footer
*/
public function getFooter()
{
return $this->_footer;
}
/**
* Add HTML code to the response
*
* @param string $content A string to be appended to
* the current output buffer
*
* @return void
*/
public function addHTML($content)
{
if (is_array($content)) {
foreach ($content as $msg) {
$this->addHTML($msg);
}
} elseif ($content instanceof Message) {
$this->_HTML .= $content->getDisplay();
} else {
$this->_HTML .= $content;
}
}
/**
* Add JSON code to the response
*
* @param mixed $json Either a key (string) or an
* array or key-value pairs
* @param mixed $value Null, if passing an array in $json otherwise
* it's a string value to the key
*
* @return void
*/
public function addJSON($json, $value = null)
{
if (is_array($json)) {
foreach ($json as $key => $value) {
$this->addJSON($key, $value);
}
} else {
if ($value instanceof Message) {
$this->_JSON[$json] = $value->getDisplay();
} else {
$this->_JSON[$json] = $value;
}
}
}
/**
* Renders the HTML response text
*
* @return string
*/
private function _getDisplay()
{
// The header may contain nothing at all,
// if its content was already rendered
// and, in this case, the header will be
// in the content part of the request
$retval = $this->_header->getDisplay();
$retval .= $this->_HTML;
$retval .= $this->_footer->getDisplay();
return $retval;
}
/**
* Sends an HTML response to the browser
*
* @return void
*/
private function _htmlResponse()
{
echo $this->_getDisplay();
}
/**
* Sends a JSON response to the browser
*
* @return void
*/
private function _ajaxResponse()
{
/* Avoid wrapping in case we're disabled */
if ($this->_isDisabled) {
echo $this->_getDisplay();
return;
}
if (! isset($this->_JSON['message'])) {
$this->_JSON['message'] = $this->_getDisplay();
} else if ($this->_JSON['message'] instanceof Message) {
$this->_JSON['message'] = $this->_JSON['message']->getDisplay();
}
if ($this->_isSuccess) {
$this->_JSON['success'] = true;
} else {
$this->_JSON['success'] = false;
$this->_JSON['error'] = $this->_JSON['message'];
unset($this->_JSON['message']);
}
if ($this->_isSuccess) {
// Note: the old judge sentence is:
// $this->_isAjaxPage && $this->_isSuccess
// Removal the first, because console need log all queries
$this->addJSON('_title', $this->getHeader()->getTitleTag());
if (isset($GLOBALS['dbi'])) {
$menuHash = $this->getHeader()->getMenu()->getHash();
$this->addJSON('_menuHash', $menuHash);
$hashes = array();
if (isset($_REQUEST['menuHashes'])) {
$hashes = explode('-', $_REQUEST['menuHashes']);
}
if (! in_array($menuHash, $hashes)) {
$this->addJSON(
'_menu',
$this->getHeader()
->getMenu()
->getDisplay()
);
}
}
$this->addJSON('_scripts', $this->getHeader()->getScripts()->getFiles());
$this->addJSON('_selflink', $this->getFooter()->getSelfUrl('unencoded'));
$this->addJSON('_displayMessage', $this->getHeader()->getMessage());
$debug = $this->_footer->getDebugMessage();
if (empty($_REQUEST['no_debug'])
&& mb_strlen($debug)
) {
$this->addJSON('_debug', $debug);
}
$errors = $this->_footer->getErrorMessages();
if (mb_strlen($errors)) {
$this->addJSON('_errors', $errors);
}
$promptPhpErrors = $GLOBALS['error_handler']->hasErrorsForPrompt();
$this->addJSON('_promptPhpErrors', $promptPhpErrors);
if (empty($GLOBALS['error_message'])) {
// set current db, table and sql query in the querywindow
// (this is for the bottom console)
$query = '';
$maxChars = $GLOBALS['cfg']['MaxCharactersInDisplayedSQL'];
if (isset($GLOBALS['sql_query'])
&& mb_strlen($GLOBALS['sql_query']) < $maxChars
) {
$query = $GLOBALS['sql_query'];
}
$this->addJSON(
'_reloadQuerywindow',
array(
'db' => PMA_ifSetOr($GLOBALS['db'], ''),
'table' => PMA_ifSetOr($GLOBALS['table'], ''),
'sql_query' => $query
)
);
if (! empty($GLOBALS['focus_querywindow'])) {
$this->addJSON('_focusQuerywindow', $query);
}
if (! empty($GLOBALS['reload'])) {
$this->addJSON('_reloadNavigation', 1);
}
$this->addJSON('_params', $this->getHeader()->getJsParams());
}
}
// Set the Content-Type header to JSON so that jQuery parses the
// response correctly.
PMA_headerJSON();
$result = json_encode($this->_JSON);
if ($result === false) {
switch (json_last_error()) {
case JSON_ERROR_NONE:
$error = 'No errors';
break;
case JSON_ERROR_DEPTH:
$error = 'Maximum stack depth exceeded';
break;
case JSON_ERROR_STATE_MISMATCH:
$error = 'Underflow or the modes mismatch';
break;
case JSON_ERROR_CTRL_CHAR:
$error = 'Unexpected control character found';
break;
case JSON_ERROR_SYNTAX:
$error = 'Syntax error, malformed JSON';
break;
case JSON_ERROR_UTF8:
$error = 'Malformed UTF-8 characters, possibly incorrectly encoded';
break;
case JSON_ERROR_RECURSION:
$error = 'One or more recursive references in the value to be encoded';
break;
case JSON_ERROR_INF_OR_NAN:
$error = 'One or more NAN or INF values in the value to be encoded';
break;
case JSON_ERROR_UNSUPPORTED_TYPE:
$error = 'A value of a type that cannot be encoded was given';
default:
$error = 'Unknown error';
break;
}
echo json_encode(
array(
'success' => false,
'error' => 'JSON encoding failed: ' . $error,
)
);
} else {
echo $result;
}
}
/**
* Sends an HTML response to the browser
*
* @static
* @return void
*/
public static function response()
{
$response = Response::getInstance();
chdir($response->getCWD());
$buffer = OutputBuffering::getInstance();
if (empty($response->_HTML)) {
$response->_HTML = $buffer->getContents();
}
if ($response->isAjax()) {
$response->_ajaxResponse();
} else {
$response->_htmlResponse();
}
$buffer->flush();
exit;
}
/**
* Wrapper around PHP's header() function.
*
* @return void
*/
public function header($text)
{
header($text);
}
/**
* Wrapper around PHP's headers_sent() function.
*
* @return bool
*/
public function headersSent()
{
return headers_sent();
}
}