silverstripe-framework/dev/Debug.php

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<?php
/**
* Supports debugging and core error handling.
*
* Attaches custom methods to the default
* error handling hooks in PHP. Currently, three levels
* of error are supported:
*
* - Notice
* - Warning
* - Error
*
* Notice level errors are currently unsupported, and will be passed
* directly to the normal PHP error output.
*
* Uncaught exceptions are currently passed to the debug
* reporter as standard PHP errors.
*
* There are four different types of error handler supported by the
* Debug class:
*
* - Friendly
* - Fatal
* - Logger
* - Emailer
*
* Currently, only Friendly, Fatal, and Emailer handlers are implemented.
*
* @todo port header/footer wrapping code to external reporter class
* @todo add support for user defined config: Debug::die_on_notice(true | false)
* @todo add appropriate handling for E_NOTICE and E_USER_NOTICE levels
* @todo better way of figuring out the error context to display in highlighted source
* @todo implement error logger handler
*
* @package sapphire
* @subpackage core
*/
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 $send_warnings_to;
/**
* Show the contents of val in a debug-friendly way.
* Debug::show() is intended to be equivalent to dprintr()
*/
static function show($val, $showHeader = true) {
if(!Director::isLive()) {
if($showHeader) {
$caller = Debug::caller();
if(Director::is_ajax())
echo "Debug ($caller[class]$caller[type]$caller[function]() in line $caller[line] of " . basename($caller['file']) . ")\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]() \n<span style=\"font-weight:normal\">in line</span> $caller[line] \n<span style=\"font-weight:normal\">of</span> " . basename($caller['file']) . ")</span>\n</h3>\n";
}
echo Debug::text($val);
if(!Director::is_ajax()) echo "</div>";
}
}
/**
* Emails the contents of the output buffer
*/
static function mailBuffer( $email, $subject ) {
mail( $email, $subject, ob_get_contents() );
ob_end_clean();
}
static function endshow($val) {
if(!Director::isLive()) {
$caller = Debug::caller();
echo "<hr>\n<h3>Debug \n<span style=\"font-size: 65%\">($caller[class]$caller[type]$caller[function]() \n<span style=\"font-weight:normal\">in line</span> $caller[line] \n<span style=\"font-weight:normal\">of</span> " . basename($caller['file']) . ")</span>\n</h3>\n";
echo Debug::text($val);
die();
}
}
static function dump($val) {
echo '<pre style="background-color:#ccc;padding:5px;">';
print_r($val);
echo '</pre>';
}
static function text($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(true || !Director::is_ajax()) {
$val = "<pre style=\"font-family: Courier new\">" . htmlentities($val) . "</pre>\n";
}
}
return $val;
}
/**
* Show a debugging message
*/
static function message($message, $showHeader = true) {
if(!Director::isLive()) {
$caller = Debug::caller();
$file = basename($caller['file']);
echo "<p style=\"background-color: white; color: black; width: 95%; margin: 0.5em; padding: 0.3em; border: 1px #CCC solid\">\n";
if($showHeader) echo "<b>Debug (line $caller[line] of $file):</b>\n ";
echo Convert::raw2xml(trim($message)) . "</p>\n";
}
}
/**
* Load an error handler
*
* @todo why does this delegate to loadFatalErrorHandler?
*/
static function loadErrorHandlers() {
Debug::loadFatalErrorHandler();
}
/**
* @todo can this be moved into loadErrorHandlers?
*/
static function loadFatalErrorHandler() {
//set_error_handler('errorHandler', (E_ALL ^ E_NOTICE) ^ E_USER_NOTICE);
set_error_handler('errorHandler', E_ALL);
set_exception_handler('exceptionHandler');
}
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, $errcontext, "Warning");
if(Director::isDev()) {
self::showError($errno, $errstr, $errfile, $errline, $errcontext);
}
}
static function fatalHandler($errno, $errstr, $errfile, $errline, $errcontext) {
if(self::$send_errors_to) self::emailError(self::$send_errors_to, $errno, $errstr, $errfile, $errline, $errcontext, "Error");
if(Director::isDev()) {
Debug::showError($errno, $errstr, $errfile, $errline, $errcontext);
} else {
Debug::friendlyError($errno, $errstr, $errfile, $errline, $errcontext);
}
die();
}
static function friendlyError($errno, $errstr, $errfile, $errline, $errcontext) {
header("HTTP/1.0 500 Internal server error");
if(Director::is_ajax()) {
echo "There has been an error";
} else {
if(file_exists('../assets/error-500.html')) {
include('../assets/error-500.html');
} else {
echo "<h1>Error</h1><p>The website server has not been able to respond to your request.</p>\n";
}
}
}
static function showError($errno, $errstr, $errfile, $errline, $errcontext) {
if(!headers_sent()) header("HTTP/1.0 500 Internal server error");
if(Director::is_ajax()) {
echo "ERROR:Error $errno: $errstr\n At l$errline in $errfile\n";
Debug::backtrace();
} else {
$reporter = new DebugView();
$reporter->writeHeader();
echo '<div class="info">';
echo "<h1>" . strip_tags($errstr) . "</h1>";
echo "<h3>{$_SERVER['REQUEST_METHOD']} {$_SERVER['REQUEST_URI']}</h3>";
echo "<p>Line <strong>$errline</strong> in <strong>$errfile</strong></p>";
echo '</div>';
echo '<div class="trace"><h3>Source</h3>';
$lines = file($errfile);
$offset = $errline-10;
$lines = array_slice($lines, $offset, 16);
echo '<pre>';
$offset++;
foreach($lines as $line) {
$line = htmlentities($line);
if ($offset == $errline) {
echo "<span>$offset</span> <span class=\"error\">$line</span>";
} else {
echo "<span>$offset</span> $line";
}
$offset++;
}
echo '</pre><h3>Trace</h3>';
Debug::backtrace();
echo '</div>';
$reporter->writeFooter();
die();
}
}
static function emailError($emailAddress, $errno, $errstr, $errfile, $errline, $errcontext, $errorType = "Error") {
if(strtolower($errorType) == 'warning') {
$colour = "orange";
} else {
$colour = "red";
}
$data = "<div style=\"border: 5px $colour solid\">\n";
$data .= "<p style=\"color: white; background-color: $colour; margin: 0\">$errorType: $errstr<br /> At line $errline in $errfile\n<br />\n<br />\n</p>\n";
$data .= Debug::backtrace(true);
$data .= "</div>\n";
// override smtp-server if needed
if(self::$custom_smtp_server) {
ini_set("SMTP", self::$custom_smtp_server);
}
$relfile = Director::makeRelative($errfile);
if($relfile[0] == '/') $relfile = substr($relfile,1);
mail($emailAddress, "$errorType at $relfile line $errline (http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI])", $data, "Content-type: text/html\nFrom: errors@silverstripe.com");
}
/**
* @param string $server IP-Address or domain
*/
static function set_custom_smtp_server($server) {
self::$custom_smtp_server = $server;
}
/**
* @return string
*/
static function get_custom_smtp_server() {
return self::$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");
* @param emailAddress The email address to send them to
* @param sendWarnings Set to true to send warnings as well as errors.
*/
static function send_errors_to($emailAddress, $sendWarnings = true) {
self::$send_errors_to = $emailAddress;
self::$send_warnings_to = $sendWarnings ? $emailAddress : null;
}
/**
* @return string
*/
static function get_send_errors_to() {
return self::$send_errors_to;
}
/**
* @return string
*/
static function get_send_warnings_to() {
return self::$send_warnings_to;
}
/**
* Deprecated. Send live errors and warnings to the given address.
* @deprecated Use send_errors_to() instead.
*/
static function sendLiveErrorsTo($emailAddress) {
user_error('Debug::sendLiveErrorsTo() is deprecated. Use Debug::send_errors_to() instead.', E_USER_NOTICE);
if(!Director::isDev()) self::send_errors_to($emailAddress, true);
}
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 $caller;
}
static function backtrace($returnVal = false, $ignoreAjax = false) {
$bt = debug_backtrace();
// Ingore functions that are plumbing of the error handler
$ignoredFunctions = array('Debug::emailError','Debug::warningHandler','Debug::fatalHandler','errorHandler','Debug::showError','Debug::backtrace', 'exceptionHandler');
while( $bt && in_array(self::full_func_name($bt[0]), $ignoredFunctions) ) {
array_shift($bt);
}
$result = "<ul>";
foreach($bt as $item) {
if(Director::is_ajax() && !$ignoreAjax) {
$result .= self::full_func_name($item,true) . "\n";
$result .= "line $item[line] of " . basename($item['file']) . "\n\n";
} else {
if ($item['function'] == 'user_error') {
$name = $item['args'][0];
} else {
$name = self::full_func_name($item,true);
}
$result .= "<li><b>" . $name . "</b>\n<br />\n";
$result .= isset($item['line']) ? "Line $item[line] of " : '';
$result .= isset($item['file']) ? basename($item['file']) : '';
$result .= "</li>\n";
}
}
$result .= "</ul>";
if ($returnVal) {
return $result;
} else {
echo $result;
}
}
/**
* Return the full function name. If showArgs is set to true, a string representation of the arguments will be shown
*/
static function full_func_name($item, $showArgs = false) {
$funcName = '';
if(isset($item['class'])) $funcName .= $item['class'];
if(isset($item['type'])) $funcName .= $item['type'];
if(isset($item['function'])) $funcName .= $item['function'];
if($showArgs && isset($item['args'])) {
$args = array();
foreach($item['args'] as $arg) {
if(!is_object($arg) || method_exists($arg, '__toString')) {
$args[] = (string) $arg;
} else {
$args[] = get_class($arg);
}
}
$funcName .= "(" . implode(",", $args) .")";
}
return $funcName;
}
/**
* Check if the user has permissions to run URL debug tools,
* else redirect them to log in.
*/
static function require_developer_login() {
if(Director::isDev()) {
return;
}
if(isset($_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'] = $_SERVER['REQUEST_URI'];
header("HTTP/1.1 302 Found");
header("Location: " . Director::baseURL() . "Security/login");
die();
}
}
function exceptionHandler($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, $context);
}
function errorHandler($errno, $errstr, $errfile, $errline, $errcontext) {
switch($errno) {
case E_ERROR:
case E_CORE_ERROR:
case E_USER_ERROR:
Debug::fatalHandler($errno, $errstr, $errfile, $errline, $errcontext);
break;
case E_NOTICE:
case E_WARNING:
case E_CORE_WARNING:
case E_USER_WARNING:
Debug::warningHandler($errno, $errstr, $errfile, $errline, $errcontext);
break;
}
}
?>