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<?php /* vim: set expandtab sw=4 ts=4 sts=4: */ /** * Manages the rendering of pages in PMA * * @package PhpMyAdmin */ declare(strict_types=1); namespace PhpMyAdmin; use PhpMyAdmin\Core; use PhpMyAdmin\Footer; use PhpMyAdmin\Header; use PhpMyAdmin\Message; use PhpMyAdmin\OutputBuffering; /** * 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; /** * PhpMyAdmin\Footer instance * * @access private * @var Footer */ private $_footer; /** * Whether we are servicing an ajax request. * * @access private * @var bool */ private $_isAjax; /** * Whether response object is disabled * * @access private * @var bool */ private $_isDisabled; /** * 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; /** * @var array<int, string> * @see http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml */ protected static $httpStatusMessages = [ // Informational 100 => 'Continue', 101 => 'Switching Protocols', 102 => 'Processing', 103 => 'Early Hints', // Success 200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content', 207 => 'Multi-Status', 208 => 'Already Reported', 226 => 'IM Used', // Redirection 300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 303 => 'See Other', 304 => 'Not Modified', 305 => 'Use Proxy', 307 => 'Temporary Redirect', 308 => 'Permanent Redirect', // Client Error 400 => 'Bad Request', 401 => 'Unauthorized', 402 => 'Payment Required', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Timeout', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Payload Too Large', 414 => 'URI Too Long', 415 => 'Unsupported Media Type', 416 => 'Range Not Satisfiable', 417 => 'Expectation Failed', 421 => 'Misdirected Request', 422 => 'Unprocessable Entity', 423 => 'Locked', 424 => 'Failed Dependency', 425 => 'Too Early', 426 => 'Upgrade Required', 427 => 'Unassigned', 428 => 'Precondition Required', 429 => 'Too Many Requests', 430 => 'Unassigned', 431 => 'Request Header Fields Too Large', 451 => 'Unavailable For Legal Reasons', // Server Error 500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Timeout', 505 => 'HTTP Version Not Supported', 506 => 'Variant Also Negotiates', 507 => 'Insufficient Storage', 508 => 'Loop Detected', 509 => 'Unassigned', 510 => 'Not Extended', 511 => 'Network Authentication Required', ]; /** * Creates a new class instance */ private function __construct() { if (! defined('TESTSUITE')) { $buffer = OutputBuffering::getInstance(); $buffer->start(); register_shutdown_function([$this, 'response']); } $this->_header = new Header(); $this->_HTML = ''; $this->_JSON = []; $this->_footer = new Footer(); $this->_isSuccess = true; $this->_isDisabled = false; $this->setAjax(! empty($_REQUEST['ajax_request'])); $this->_CWD = getcwd(); } /** * Set the ajax flag to indicate whether * we are servicing an ajax request * * @param bool $isAjax Whether we are servicing an ajax request * * @return void */ public function setAjax(bool $isAjax): void { $this->_isAjax = $isAjax; $this->_header->setAjax($this->_isAjax); $this->_footer->setAjax($this->_isAjax); } /** * 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(bool $state): void { $this->_isSuccess = ($state === true); } /** * Returns true or false depending on whether * we are servicing an ajax request * * @return bool */ public function isAjax(): bool { 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 PhpMyAdmin\Header object * * @return Header */ public function getHeader() { return $this->_header; } /** * Returns a PhpMyAdmin\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'] = $this->_getDisplay(); } elseif ($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) { $this->addJSON('title', '<title>' . $this->getHeader()->getPageTitle() . '</title>'); if (isset($GLOBALS['dbi'])) { $menuHash = $this->getHeader()->getMenu()->getHash(); $this->addJSON('menuHash', $menuHash); $hashes = []; if (isset($_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()); $this->addJSON('displayMessage', $this->getHeader()->getMessage()); $debug = $this->_footer->getDebugMessage(); if (empty($_REQUEST['no_debug']) && strlen($debug) > 0 ) { $this->addJSON('debug', $debug); } $errors = $this->_footer->getErrorMessages(); if (strlen($errors) > 0) { $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']; } $this->addJSON( 'reloadQuerywindow', [ 'db' => Core::ifSetOr($GLOBALS['db'], ''), 'table' => Core::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. Core::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'; break; default: $error = 'Unknown error'; break; } echo json_encode([ 'success' => false, 'error' => 'JSON encoding failed: ' . $error, ]); } else { echo $result; } } /** * Sends an HTML response to the browser * * @return void */ public function response() { chdir($this->getCWD()); $buffer = OutputBuffering::getInstance(); if (empty($this->_HTML)) { $this->_HTML = $buffer->getContents(); } if ($this->isAjax()) { $this->_ajaxResponse(); } else { $this->_htmlResponse(); } $buffer->flush(); exit; } /** * Wrapper around PHP's header() function. * * @param string $text header string * * @return void */ public function header($text) { header($text); } /** * Wrapper around PHP's headers_sent() function. * * @return bool */ public function headersSent() { return headers_sent(); } /** * Wrapper around PHP's http_response_code() function. * * @param int $response_code will set the response code. * * @return void */ public function httpResponseCode($response_code) { http_response_code($response_code); } /** * Sets http response code. * * @param int $responseCode will set the response code. * * @return void */ public function setHttpResponseCode(int $responseCode): void { $this->httpResponseCode($responseCode); $header = 'status: ' . $responseCode . ' '; if (isset(static::$httpStatusMessages[$responseCode])) { $header .= static::$httpStatusMessages[$responseCode]; } else { $header .= 'Web server is down'; } if (PHP_SAPI !== 'cgi-fcgi') { $this->header($header); } } /** * Generate header for 303 * * @param string $location will set location to redirect. * * @return void */ public function generateHeader303($location) { $this->setHttpResponseCode(303); $this->header('Location: ' . $location); if (! defined('TESTSUITE')) { exit; } } /** * Configures response for the login page * * @return bool Whether caller should exit */ public function loginPage() { /* Handle AJAX redirection */ if ($this->isAjax()) { $this->setRequestStatus(false); // redirect_flag redirects to the login page $this->addJSON('redirect_flag', '1'); return true; } $this->getFooter()->setMinimal(); $header = $this->getHeader(); $header->setBodyId('loginform'); $header->setTitle('phpMyAdmin'); $header->disableMenuAndConsole(); $header->disableWarnings(); return false; } }