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<?php
/**
* Supports debugging and core error handling.
*
* Attaches custom methods to the default error handling hooks
* in PHP. Currently, two levels of error are supported:
*
* - Notice
* - Warning
* - Error
*
* Uncaught exceptions are currently passed to the debug
* reporter as standard PHP errors.
*
* Errors handled by this class are passed along to {@link SS_Log}.
* For configuration information, see the {@link SS_Log}
* class documentation.
*
* @todo add support for user defined config: Debug::die_on_notice(true | false)
* @todo better way of figuring out the error context to display in highlighted source
*
* @package framework
* @subpackage dev
*/
class Debug {
/**
* @var $custom_smtp_server string Custom mailserver for sending mails.
*/
protected static $custom_smtp_server = '';
/**
* @var $send_errors_to string Email address to send error notifications
*/
protected static $send_errors_to;
/**
* @var $send_warnings_to string Email address to send warning notifications
*/
protected static $send_warnings_to;
/**
* String indicating the file where errors are logged.
* Filename is relative to the site root.
* The named file will have a terse log sent to it, and the full log (an
* encoded file containing backtraces and things) will go to a file of a similar
* name, but with the suffix ".full" added.
*/
protected static $log_errors_to = null;
/**
* The header of the message shown to users on the live site when a fatal error occurs.
*/
public static $friendly_error_header = 'There has been an error';
/**
* The body of the message shown to users on the live site when a fatal error occurs.
*/
public static $friendly_error_detail = 'The website server has not been able to respond to your request.';
/**
* Show the contents of val in a debug-friendly way.
* Debug::show() is intended to be equivalent to dprintr()
*/
public static function show($val, $showHeader = true) {
if(!Director::isLive()) {
if($showHeader) {
$caller = Debug::caller();
if(Director::is_ajax() || Director::is_cli())
echo "Debug ($caller[class]$caller[type]$caller[function]() in " . basename($caller['file'])
. ":$caller[line])\n";
else
echo "<div style=\"background-color: white; text-align: left;\">\n<hr>\n"
. "<h3>Debug <span style=\"font-size: 65%\">($caller[class]$caller[type]$caller[function]()"
. " \nin " . basename($caller['file']) . ":$caller[line])</span>\n</h3>\n";
}
echo Debug::text($val);
if(!Director::is_ajax() && !Director::is_cli()) echo "</div>";
else echo "\n\n";
}
}
/**
* Close out the show dumper
*
* @param mixed $val
*/
public static function endshow($val) {
if(!Director::isLive()) {
$caller = Debug::caller();
echo "<hr>\n<h3>Debug \n<span style=\"font-size: 65%\">($caller[class]$caller[type]$caller[function]()"
. " \nin " . basename($caller['file']) . ":$caller[line])</span>\n</h3>\n";
echo Debug::text($val);
die();
}
}
/**
* Quick dump of a variable.
*
* @param mixed $val
*/
public static function dump($val) {
echo '<pre style="background-color:#ccc;padding:5px;font-size:14px;line-height:18px;">';
$caller = Debug::caller();
echo "<span style=\"font-size: 12px;color:#666;\">" . basename($caller['file']) . ":$caller[line] - </span>\n";
if (is_string($val)) print_r(wordwrap($val, 100));
else print_r($val);
echo '</pre>';
}
/**
* ??
*
* @param unknown_type $val
* @return unknown
*/
public static function text($val) {
if(is_object($val)) {
if(method_exists($val, 'hasMethod')) {
$hasDebugMethod = $val->hasMethod('debug');
} else {
$hasDebugMethod = method_exists($val, 'debug');
}
if($hasDebugMethod) {
return $val->debug();
}
}
if(is_array($val)) {
$result = "<ul>\n";
foreach($val as $k => $v) {
$result .= "<li>$k = " . Debug::text($v) . "</li>\n";
}
$val = $result . "</ul>\n";
} else if (is_object($val)) {
$val = var_export($val, true);
} else if (is_bool($val)) {
$val = $val ? 'true' : 'false';
$val = '(bool) ' . $val;
} else {
if(!Director::is_cli() && !Director::is_ajax()) {
$val = "<pre style=\"font-family: Courier new\">" . htmlentities($val, ENT_COMPAT, 'UTF-8')
. "</pre>\n";
}
}
return $val;
}
/**
* Show a debugging message
*/
public static function message($message, $showHeader = true) {
if(!Director::isLive()) {
$caller = Debug::caller();
$file = basename($caller['file']);
if(Director::is_cli()) {
if($showHeader) echo "Debug (line $caller[line] of $file):\n ";
echo $message . "\n";
} else {
echo "<p class=\"message warning\">\n";
if($showHeader) echo "<b>Debug (line $caller[line] of $file):</b>\n ";
echo Convert::raw2xml($message) . "</p>\n";
}
}
}
// Keep track of how many headers have been sent
static $headerCount = 0;
/**
* Send a debug message in an HTTP header. Only works if you are
* on Dev, and headers have not yet been sent.
*
* @param string $msg
* @param string $prefix (optional)
* @return void
*/
public static function header($msg, $prefix = null) {
if (Director::isDev() && !headers_sent()) {
self::$headerCount++;
header('SS-'.self::$headerCount.($prefix?'-'.$prefix:'').': '.$msg);
}
}
/**
* Log to a standard text file output.
*
* @param $message string to output
*/
public static function log($message) {
$file = dirname(__FILE__).'/../../debug.log';
$now = date('r');
$oldcontent = (file_exists($file)) ? file_get_contents($file) : '';
$content = $oldcontent . "\n\n== $now ==\n$message\n";
file_put_contents($file, $content);
}
/**
* Load error handlers into environment.
* Caution: The error levels default to E_ALL is the site is in dev-mode (set in main.php).
*/
public static function loadErrorHandlers() {
set_error_handler('errorHandler', error_reporting());
set_exception_handler('exceptionHandler');
}
public static function noticeHandler($errno, $errstr, $errfile, $errline, $errcontext) {
if(error_reporting() == 0) return;
// Send out the error details to the logger for writing
SS_Log::log(
array(
'errno' => $errno,
'errstr' => $errstr,
'errfile' => $errfile,
'errline' => $errline,
'errcontext' => $errcontext
),
SS_Log::NOTICE
);
if(Director::isDev()) {
self::showError($errno, $errstr, $errfile, $errline, $errcontext, "Notice");
}
}
/**
* Handle a non-fatal warning error thrown by PHP interpreter.
*
* @param unknown_type $errno
* @param unknown_type $errstr
* @param unknown_type $errfile
* @param unknown_type $errline
* @param unknown_type $errcontext
*/
public static function warningHandler($errno, $errstr, $errfile, $errline, $errcontext) {
if(error_reporting() == 0) return;
if(self::$send_warnings_to) {
self::emailError(self::$send_warnings_to, $errno, $errstr, $errfile, $errline, $errcontext, "Warning");
}
// Send out the error details to the logger for writing
SS_Log::log(
array(
'errno' => $errno,
'errstr' => $errstr,
'errfile' => $errfile,
'errline' => $errline,
'errcontext' => $errcontext
),
SS_Log::WARN
);
if(self::$log_errors_to) {
self::log_error_if_necessary( $errno, $errstr, $errfile, $errline, $errcontext, "Warning");
}
if(Director::isDev()) {
self::showError($errno, $errstr, $errfile, $errline, $errcontext, "Warning");
}
}
/**
* Handle a fatal error, depending on the mode of the site (ie: Dev, Test, or Live).
*
* Runtime execution dies immediately once the error is generated.
*
* @param unknown_type $errno
* @param unknown_type $errstr
* @param unknown_type $errfile
* @param unknown_type $errline
* @param unknown_type $errcontext
*/
public static function fatalHandler($errno, $errstr, $errfile, $errline, $errcontext) {
if(self::$send_errors_to) {
self::emailError(self::$send_errors_to, $errno, $errstr, $errfile, $errline, $errcontext, "Error");
}
// Send out the error details to the logger for writing
SS_Log::log(
array(
'errno' => $errno,
'errstr' => $errstr,
'errfile' => $errfile,
'errline' => $errline,
'errcontext' => $errcontext
),
SS_Log::ERR
);
if(self::$log_errors_to) {
self::log_error_if_necessary( $errno, $errstr, $errfile, $errline, $errcontext, "Error");
}
if(Director::isDev() || Director::is_cli()) {
self::showError($errno, $errstr, $errfile, $errline, $errcontext, "Error");
} else {
self::friendlyError();
}
exit(1);
}
/**
* Render a user-facing error page, using the default HTML error template
* rendered by {@link ErrorPage} if it exists. Doesn't use the standard {@link SS_HTTPResponse} class
* the keep dependencies minimal.
*
* @uses ErrorPage
*
* @param int $statusCode HTTP Status Code (Default: 500)
* @param string $friendlyErrorMessage User-focused error message. Should not contain code pointers
* or "tech-speak". Used in the HTTP Header and ajax responses.
* @param string $friendlyErrorDetail Detailed user-focused message. Is just used if no {@link ErrorPage} is found
* for this specific status code.
* @return string HTML error message for non-ajax requests, plaintext for ajax-request.
*/
public static function friendlyError($statusCode=500, $friendlyErrorMessage=null, $friendlyErrorDetail=null) {
if(!$friendlyErrorMessage) $friendlyErrorMessage = self::$friendly_error_header;
if(!$friendlyErrorDetail) $friendlyErrorDetail = self::$friendly_error_detail;
if(!headers_sent()) {
$currController = Controller::curr();
// Ensure the error message complies with the HTTP 1.1 spec
$msg = strip_tags(str_replace(array("\n", "\r"), '', $friendlyErrorMessage));
if($currController) {
$response = $currController->getResponse();
$response->setStatusCode($statusCode, $msg);
} else {
header($_SERVER['SERVER_PROTOCOL'] . " $statusCode $msg");
}
}
if(Director::is_ajax()) {
echo $friendlyErrorMessage;
} else {
if(class_exists('ErrorPage')){
$errorFilePath = ErrorPage::get_filepath_for_errorcode(
$statusCode,
class_exists('Translatable') ? Translatable::get_current_locale() : null
);
if(file_exists($errorFilePath)) {
$content = file_get_contents(ASSETS_PATH . "/error-$statusCode.html");
// $BaseURL is left dynamic in error-###.html, so that multi-domain sites don't get broken
echo str_replace('$BaseURL', Director::absoluteBaseURL(), $content);
}
} else {
$renderer = new DebugView();
$renderer->writeHeader();
$renderer->writeInfo("Website Error", $friendlyErrorMessage, $friendlyErrorDetail);
if(Email::getAdminEmail()) {
$mailto = Email::obfuscate(Email::getAdminEmail());
$renderer->writeParagraph('Contact an administrator: ' . $mailto . '');
}
$renderer->writeFooter();
}
}
}
/**
* Create an instance of an appropriate DebugView object.
*/
public static function create_debug_view() {
if(Director::is_cli() || Director::is_ajax()) return new CliDebugView();
else return new DebugView();
}
/**
* Render a developer facing error page, showing the stack trace and details
* of the code where the error occured.
*
* @param unknown_type $errno
* @param unknown_type $errstr
* @param unknown_type $errfile
* @param unknown_type $errline
* @param unknown_type $errcontext
*/
public static function showError($errno, $errstr, $errfile, $errline, $errcontext, $errtype) {
if(!headers_sent()) {
$errText = "$errtype at line $errline of $errfile";
$errText = str_replace(array("\n","\r")," ",$errText);
if(!headers_sent()) header($_SERVER['SERVER_PROTOCOL'] . " 500 $errText");
// if error is displayed through ajax with CliDebugView, use plaintext output
if(Director::is_ajax()) {
header('Content-Type: text/plain');
}
}
// Legacy error handling for customized prototype.js Ajax.Base.responseIsSuccess()
// if(Director::is_ajax()) echo "ERROR:\n";
$reporter = self::create_debug_view();
// Coupling alert: This relies on knowledge of how the director gets its URL, it could be improved.
$httpRequest = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : @$_REQUEST['url'];
if(isset($_SERVER['REQUEST_METHOD'])) $httpRequest = $_SERVER['REQUEST_METHOD'] . ' ' . $httpRequest;
$reporter->writeHeader($httpRequest);
$reporter->writeError($httpRequest, $errno, $errstr, $errfile, $errline, $errcontext);
if(file_exists($errfile)) {
$lines = file($errfile);
// Make the array 1-based
array_unshift($lines,"");
unset($lines[0]);
$offset = $errline-10;
$lines = array_slice($lines, $offset, 16, true);
$reporter->writeSourceFragment($lines, $errline);
}
$reporter->writeTrace(($errcontext ? $errcontext : debug_backtrace()));
$reporter->writeFooter();
}
/**
* Utility method to render a snippet of PHP source code, from selected file
* and highlighting the given line number.
*
* @param string $errfile
* @param int $errline
*/
public static function showLines($errfile, $errline) {
$lines = file($errfile);
$offset = $errline-10;
$lines = array_slice($lines, $offset, 16);
echo '<pre>';
$offset++;
foreach($lines as $line) {
$line = htmlentities($line, ENT_COMPAT, 'UTF-8');
if ($offset == $errline) {
echo "<span>$offset</span> <span class=\"error\">$line</span>";
} else {
echo "<span>$offset</span> $line";
}
$offset++;
}
echo '</pre>';
}
/**
* Dispatch an email notification message when an error is triggered.
* @deprecated 2.5
* To create error logs by email, use this code instead:
* <code>
* $emailWriter = new SS_LogEmailWriter('my@email.com');
* SS_Log::add_writer($emailWriter, SS_Log::ERR);
* </code>
*
* @param string $emailAddress
* @param string $errno
* @param string $errstr
* @param string $errfile
* @param int $errline
* @param string $errcontext
* @param string $errorType "warning" or "error"
* @return boolean
*/
public static function emailError($emailAddress, $errno, $errstr, $errfile, $errline, $errcontext,
$errorType = "Error") {
Deprecation::notice('2.5',
'Use SS_Log instead. See the class documentation in SS_Log.php for more information.');
$priority = ($errorType == 'Error') ? SS_Log::ERR : SS_Log::WARN;
$writer = new SS_LogEmailWriter($emailAddress);
SS_Log::add_writer($writer, $priority);
SS_Log::log(
array(
'errno' => $errno,
'errstr' => $errstr,
'errfile' => $errfile,
'errline' => $errline,
'errcontext' => $errcontext
),
$priority
);
SS_Log::remove_writer($writer);
}
/**
* Log the given error, if self::$log_errors is set.
* Uses the native error_log() funtion in PHP.
*
* Format: [d-M-Y h:i:s] <type> at <file> line <line>: <errormessage> <url>
*
* @todo Detect script path for CLI errors
* @todo Log detailed errors to full file
* @deprecated 2.5 See SS_Log on setting up error file logging
*/
protected static function log_error_if_necessary($errno, $errstr, $errfile, $errline, $errcontext, $errtype) {
Deprecation::notice('2.5',
'Use SS_Log instead. See the class documentation in SS_Log.php for more information.');
$priority = ($errtype == 'Error') ? SS_Log::ERR : SS_Log::WARN;
$writer = new SS_LogFileWriter('../' . self::$log_errors_to);
SS_Log::add_writer($writer, $priority);
SS_Log::log(
array(
'errno' => $errno,
'errstr' => $errstr,
'errfile' => $errfile,
'errline' => $errline,
'errcontext' => $errcontext
),
$priority
);
SS_Log::remove_writer($writer);
}
/**
* @param string $server IP-Address or domain
* @deprecated 2.5 See SS_Log on setting up error email notification
*/
public static function set_custom_smtp_server($server) {
self::$custom_smtp_server = $server;
}
/**
* @return string
* @deprecated 2.5 See SS_Log on setting up error email notification
*/
public static function get_custom_smtp_server() {
return self::$custom_smtp_server;
}
/**
* Send errors to the given email address.
* Can be used like so:
* if(Director::isLive()) Debug::send_errors_to("sam@silverstripe.com");
*
* @deprecated 2.5 See SS_Log on setting up error email notification
*
* @param string $emailAddress The email address to send errors to
* @param string $sendWarnings Set to true to send warnings as well as errors (Default: false)
*/
public static function send_errors_to($emailAddress, $sendWarnings = false) {
Deprecation::notice('2.5', 'Use SS_Log instead. See SS_Log on setting up error email notification.');
self::$send_errors_to = $emailAddress;
self::$send_warnings_to = $sendWarnings ? $emailAddress : null;
}
/**
* @return string
* @deprecated 2.5 See SS_Log on setting up error email notification
*/
public static function get_send_errors_to() {
Deprecation::notice('2.5', 'Use SS_Log instead. See SS_Log on setting up error email notification.');
return self::$send_errors_to;
}
/**
* @param string $emailAddress
* @deprecated 2.5 See SS_Log on setting up error email notification
*/
public static function send_warnings_to($emailAddress) {
Deprecation::notice('2.5', 'Use SS_Log instead. See SS_Log on setting up error email notification.');
self::$send_warnings_to = $emailAddress;
}
/**
* @return string
* @deprecated 2.5 See SS_Log on setting up error email notification
*/
public static function get_send_warnings_to() {
Deprecation::notice('2.5', 'Use SS_Log instead. See SS_Log on setting up error email notification.');
return self::$send_warnings_to;
}
/**
* Call this to enable logging of errors.
* @deprecated 2.5 See SS_Log on setting up error file logging
*/
public static function log_errors_to($logFile = ".sserrors") {
Deprecation::notice('2.5', 'Use SS_Log instead. See SS_Log on setting up error file logging.');
self::$log_errors_to = $logFile;
}
public static function caller() {
$bt = debug_backtrace();
$caller = $bt[2];
$caller['line'] = $bt[1]['line'];
$caller['file'] = $bt[1]['file'];
if(!isset($caller['class'])) $caller['class'] = '';
if(!isset($caller['type'])) $caller['type'] = '';
return $caller;
}
/**
* @deprecated 2.5 Please use {@link SS_Backtrace::backtrace()}
*/
public static function backtrace($returnVal = false, $ignoreAjax = false) {
Deprecation::notice('2.5', 'Use SS_Backtrace::backtrace instead.');
return SS_Backtrace::backtrace($returnVal, $ignoreAjax);
}
/**
* @deprecated 2.5 Please use {@link SS_Backtrace::get_rendered_backtrace()}
*/
public static function get_rendered_backtrace($bt, $plainText = false) {
Deprecation::notice('2.5', 'Use SS_Backtrace::get_rendered_backtrace() instead.');
return SS_Backtrace::get_rendered_backtrace($bt, $plainText);
}
/**
* Check if the user has permissions to run URL debug tools,
* else redirect them to log in.
*/
public static function require_developer_login() {
if(Director::isDev()) {
return;
}
if(isset($_SESSION['loggedInAs'])) {
// We have to do some raw SQL here, because this method is called in Object::defineMethods().
// This means we have to be careful about what objects we create, as we don't want Object::defineMethods()
// being called again.
// This basically calls Permission::checkMember($_SESSION['loggedInAs'], 'ADMIN');
$memberID = $_SESSION['loggedInAs'];
$groups = DB::query("SELECT \"GroupID\" from \"Group_Members\" WHERE \"MemberID\" = " . $memberID);
$groupCSV = implode($groups->column(), ',');
$permission = DB::query("
SELECT \"ID\"
FROM \"Permission\"
WHERE (
\"Code\" = 'ADMIN'
AND \"Type\" = " . Permission::GRANT_PERMISSION . "
AND \"GroupID\" IN ($groupCSV)
)
")->value();
if($permission) {
return;
}
}
// This basically does the same as
// Security::permissionFailure(null, "You need to login with developer access to make use of debugging tools.")
// We have to do this because of how early this method is called in execution.
$_SESSION['Security']['Message']['message']
= "You need to login with developer access to make use of debugging tools.";
$_SESSION['Security']['Message']['type'] = 'warning';
$_SESSION['BackURL'] = $_SERVER['REQUEST_URI'];
header($_SERVER['SERVER_PROTOCOL'] . " 302 Found");
header("Location: " . Director::baseURL() . "Security/login");
die();
}
}
/**
* Generic callback, to catch uncaught exceptions when they bubble up to the top of the call chain.
*
* @ignore
* @param Exception $exception
*/
function exceptionHandler($exception) {
$errno = E_USER_ERROR;
$type = get_class($exception);
$message = "Uncaught " . $type . ": " . $exception->getMessage();
$file = $exception->getFile();
$line = $exception->getLine();
$context = $exception->getTrace();
Debug::fatalHandler($errno, $message, $file, $line, $context);
}
/**
* Generic callback to catch standard PHP runtime errors thrown by the interpreter
* or manually triggered with the user_error function.
* Caution: The error levels default to E_ALL is the site is in dev-mode (set in main.php).
*
* @ignore
* @param int $errno
* @param string $errstr
* @param string $errfile
* @param int $errline
*/
function errorHandler($errno, $errstr, $errfile, $errline) {
switch($errno) {
case E_ERROR:
case E_CORE_ERROR:
case E_USER_ERROR:
Debug::fatalHandler($errno, $errstr, $errfile, $errline, null);
break;
case E_WARNING:
case E_CORE_WARNING:
case E_USER_WARNING:
Debug::warningHandler($errno, $errstr, $errfile, $errline, null);
break;
case E_NOTICE:
case E_USER_NOTICE:
case E_DEPRECATED:
case E_USER_DEPRECATED:
case E_STRICT:
Debug::noticeHandler($errno, $errstr, $errfile, $errline, null);
break;
}
}
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