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<?php
/**
* Framework debugging and PHP error-handling class
*
* Provides enhanced logging, stack traces, and rendering debug views
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.Utility
* @since CakePHP(tm) v 1.2.4560
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

App::uses('CakeLog', 'Log');
App::uses('String', 'Utility');

/**
* Provide custom logging and error handling.
*
* Debugger overrides PHP's default error handling to provide stack traces and enhanced logging
*
* @package Cake.Utility
* @link http://book.cakephp.org/2.0/en/development/debugging.html#debugger-class
*/
class Debugger {

/**
* A list of errors generated by the application.
*
* @var array
*/
public $errors = array();

/**
* The current output format.
*
* @var string
*/
protected $_outputFormat = 'js';

/**
* Templates used when generating trace or error strings. Can be global or indexed by the format
* value used in $_outputFormat.
*
* @var string
*/
protected $_templates = array(
'log' => array(
'trace' => '{:reference} - {:path}, line {:line}',
'error' => "{:error} ({:code}): {:description} in [{:file}, line {:line}]"
),
'js' => array(
'error' => '',
'info' => '',
'trace' => '<pre class="stack-trace">{:trace}</pre>',
'code' => '',
'context' => '',
'links' => array(),
'escapeContext' => true,
),
'html' => array(
'trace' => '<pre class="cake-error trace"><b>Trace</b> <p>{:trace}</p></pre>',
'context' => '<pre class="cake-error context"><b>Context</b> <p>{:context}</p></pre>',
'escapeContext' => true,
),
'txt' => array(
'error' => "{:error}: {:code} :: {:description} on line {:line} of {:path}\n{:info}",
'code' => '',
'info' => ''
),
'base' => array(
'traceLine' => '{:reference} - {:path}, line {:line}',
'trace' => "Trace:\n{:trace}\n",
'context' => "Context:\n{:context}\n",
),
'log' => array(),
);

/**
* Holds current output data when outputFormat is false.
*
* @var string
*/
protected $_data = array();

/**
* Constructor.
*
*/
public function __construct() {
$docRef = ini_get('docref_root');

if (empty($docRef) && function_exists('ini_set')) {
ini_set('docref_root', 'http://php.net/');
}
if (!defined('E_RECOVERABLE_ERROR')) {
define('E_RECOVERABLE_ERROR', 4096);
}

$e = '<pre class="cake-error">';
$e .= '<a href="javascript:void(0);" onclick="document.getElementById(\'{:id}-trace\')';
$e .= '.style.display = (document.getElementById(\'{:id}-trace\').style.display == ';
$e .= '\'none\' ? \'\' : \'none\');"><b>{:error}</b> ({:code})</a>: {:description} ';
$e .= '[<b>{:path}</b>, line <b>{:line}</b>]';

$e .= '<div id="{:id}-trace" class="cake-stack-trace" style="display: none;">';
$e .= '{:links}{:info}</div>';
$e .= '</pre>';
$this->_templates['js']['error'] = $e;

$t = '<div id="{:id}-trace" class="cake-stack-trace" style="display: none;">';
$t .= '{:context}{:code}{:trace}</div>';
$this->_templates['js']['info'] = $t;

$links = array();
$link = '<a href="javascript:void(0);" onclick="document.getElementById(\'{:id}-code\')';
$link .= '.style.display = (document.getElementById(\'{:id}-code\').style.display == ';
$link .= '\'none\' ? \'\' : \'none\')">Code</a>';
$links['code'] = $link;

$link = '<a href="javascript:void(0);" onclick="document.getElementById(\'{:id}-context\')';
$link .= '.style.display = (document.getElementById(\'{:id}-context\').style.display == ';
$link .= '\'none\' ? \'\' : \'none\')">Context</a>';
$links['context'] = $link;

$this->_templates['js']['links'] = $links;

$this->_templates['js']['context'] = '<pre id="{:id}-context" class="cake-context" ';
$this->_templates['js']['context'] .= 'style="display: none;">{:context}</pre>';

$this->_templates['js']['code'] = '<pre id="{:id}-code" class="cake-code-dump" ';
$this->_templates['js']['code'] .= 'style="display: none;">{:code}</pre>';

$e = '<pre class="cake-error"><b>{:error}</b> ({:code}) : {:description} ';
$e .= '[<b>{:path}</b>, line <b>{:line}]</b></pre>';
$this->_templates['html']['error'] = $e;

$this->_templates['html']['context'] = '<pre class="cake-context"><b>Context</b> ';
$this->_templates['html']['context'] .= '<p>{:context}</p></pre>';
}

/**
* Returns a reference to the Debugger singleton object instance.
*
* @param string $class
* @return object
*/
public static function &getInstance($class = null) {
static $instance = array();
if (!empty($class)) {
if (!$instance || strtolower($class) != strtolower(get_class($instance[0]))) {
$instance[0] = new $class();
}
}
if (!$instance) {
$instance[0] = new Debugger();
}
return $instance[0];
}

/**
* Recursively formats and outputs the contents of the supplied variable.
*
*
* @param mixed $var the variable to dump
* @return void
* @see Debugger::exportVar()
* @link http://book.cakephp.org/2.0/en/development/debugging.html#Debugger::dump
*/
public static function dump($var) {
pr(self::exportVar($var));
}

/**
* Creates an entry in the log file. The log entry will contain a stack trace from where it was called.
* as well as export the variable using exportVar. By default the log is written to the debug log.
*
* @param mixed $var Variable or content to log
* @param integer $level type of log to use. Defaults to LOG_DEBUG
* @return void
* @link http://book.cakephp.org/2.0/en/development/debugging.html#Debugger::log
*/
public static function log($var, $level = LOG_DEBUG) {
$source = self::trace(array('start' => 1)) . "\n";
CakeLog::write($level, "\n" . $source . self::exportVar($var));
}

/**
* Overrides PHP's default error handling.
*
* @param integer $code Code of error
* @param string $description Error description
* @param string $file File on which error occurred
* @param integer $line Line that triggered the error
* @param array $context Context
* @return boolean true if error was handled
* @deprecated This function is superseded by Debugger::outputError()
*/
public static function showError($code, $description, $file = null, $line = null, $context = null) {
$self = Debugger::getInstance();

if (empty($file)) {
$file = '[internal]';
}
if (empty($line)) {
$line = '??';
}

$info = compact('code', 'description', 'file', 'line');
if (!in_array($info, $self->errors)) {
$self->errors[] = $info;
} else {
return;
}

switch ($code) {
case E_PARSE:
case E_ERROR:
case E_CORE_ERROR:
case E_COMPILE_ERROR:
case E_USER_ERROR:
$error = 'Fatal Error';
$level = LOG_ERR;
break;
case E_WARNING:
case E_USER_WARNING:
case E_COMPILE_WARNING:
case E_RECOVERABLE_ERROR:
$error = 'Warning';
$level = LOG_WARNING;
break;
case E_NOTICE:
case E_USER_NOTICE:
$error = 'Notice';
$level = LOG_NOTICE;
break;
case E_DEPRECATED:
case E_USER_DEPRECATED:
$error = 'Deprecated';
$level = LOG_NOTICE;
break;
default:
return;
}

$data = compact(
'level', 'error', 'code', 'description', 'file', 'path', 'line', 'context'
);
echo $self->outputError($data);

if ($error == 'Fatal Error') {
exit();
}
return true;
}

/**
* Outputs a stack trace based on the supplied options.
*
* ### Options
*
* - `depth` - The number of stack frames to return. Defaults to 999
* - `format` - The format you want the return. Defaults to the currently selected format. If
* format is 'array' or 'points' the return will be an array.
* - `args` - Should arguments for functions be shown? If true, the arguments for each method call
* will be displayed.
* - `start` - The stack frame to start generating a trace from. Defaults to 0
*
* @param array $options Format for outputting stack trace
* @return mixed Formatted stack trace
* @link http://book.cakephp.org/2.0/en/development/debugging.html#Debugger::trace
*/
public static function trace($options = array()) {
$self = Debugger::getInstance();
$defaults = array(
'depth' => 999,
'format' => $self->_outputFormat,
'args' => false,
'start' => 0,
'scope' => null,
'exclude' => array('call_user_func_array', 'trigger_error')
);
$options = Hash::merge($defaults, $options);

$backtrace = debug_backtrace();
$count = count($backtrace);
$back = array();

$_trace = array(
'line' => '??',
'file' => '[internal]',
'class' => null,
'function' => '[main]'
);

for ($i = $options['start']; $i < $count && $i < $options['depth']; $i++) {
$trace = array_merge(array('file' => '[internal]', 'line' => '??'), $backtrace[$i]);
$signature = $reference = '[main]';

if (isset($backtrace[$i + 1])) {
$next = array_merge($_trace, $backtrace[$i + 1]);
$signature = $reference = $next['function'];

if (!empty($next['class'])) {
$signature = $next['class'] . '::' . $next['function'];
$reference = $signature . '(';
if ($options['args'] && isset($next['args'])) {
$args = array();
foreach ($next['args'] as $arg) {
$args[] = Debugger::exportVar($arg);
}
$reference .= join(', ', $args);
}
$reference .= ')';
}
}
if (in_array($signature, $options['exclude'])) {
continue;
}
if ($options['format'] == 'points' && $trace['file'] != '[internal]') {
$back[] = array('file' => $trace['file'], 'line' => $trace['line']);
} elseif ($options['format'] == 'array') {
$back[] = $trace;
} else {
if (isset($self->_templates[$options['format']]['traceLine'])) {
$tpl = $self->_templates[$options['format']]['traceLine'];
} else {
$tpl = $self->_templates['base']['traceLine'];
}
$trace['path'] = self::trimPath($trace['file']);
$trace['reference'] = $reference;
unset($trace['object'], $trace['args']);
$back[] = String::insert($tpl, $trace, array('before' => '{:', 'after' => '}'));
}
}

if ($options['format'] == 'array' || $options['format'] == 'points') {
return $back;
}
return implode("\n", $back);
}

/**
* Shortens file paths by replacing the application base path with 'APP', and the CakePHP core
* path with 'CORE'.
*
* @param string $path Path to shorten
* @return string Normalized path
*/
public static function trimPath($path) {
if (!defined('CAKE_CORE_INCLUDE_PATH') || !defined('APP')) {
return $path;
}

if (strpos($path, APP) === 0) {
return str_replace(APP, 'APP' . DS, $path);
} elseif (strpos($path, CAKE_CORE_INCLUDE_PATH) === 0) {
return str_replace(CAKE_CORE_INCLUDE_PATH, 'CORE', $path);
} elseif (strpos($path, ROOT) === 0) {
return str_replace(ROOT, 'ROOT', $path);
}

return $path;
}

/**
* Grabs an excerpt from a file and highlights a given line of code.
*
* Usage:
*
* `Debugger::excerpt('/path/to/file', 100, 4);`
*
* The above would return an array of 8 items. The 4th item would be the provided line,
* and would be wrapped in `<span class="code-highlight"></span>`. All of the lines
* are processed with highlight_string() as well, so they have basic PHP syntax highlighting
* applied.
*
* @param string $file Absolute path to a PHP file
* @param integer $line Line number to highlight
* @param integer $context Number of lines of context to extract above and below $line
* @return array Set of lines highlighted
* @see http://php.net/highlight_string
* @link http://book.cakephp.org/2.0/en/development/debugging.html#Debugger::excerpt
*/
public static function excerpt($file, $line, $context = 2) {
$lines = array();
if (!file_exists($file)) {
return array();
}
$data = file_get_contents($file);
if (!empty($data) && strpos($data, "\n") !== false) {
$data = explode("\n", $data);
}

if (empty($data) || !isset($data[$line])) {
return;
}
for ($i = $line - ($context + 1); $i < $line + $context; $i++) {
if (!isset($data[$i])) {
continue;
}
$string = str_replace(array("\r\n", "\n"), "", self::_highlight($data[$i]));
if ($i == $line) {
$lines[] = '<span class="code-highlight">' . $string . '</span>';
} else {
$lines[] = $string;
}
}
return $lines;
}

/**
* Wraps the highlight_string funciton in case the server API does not
* implement the function as it is the case of the HipHop interpreter
*
* @param string $str the string to convert
* @return string
*/
protected static function _highlight($str) {
static $supportHighlight = null;
if (!$supportHighlight && function_exists('hphp_log')) {
$supportHighlight = false;
return htmlentities($str);
}
$supportHighlight = true;
return highlight_string($str, true);
}

/**
* Converts a variable to a string for debug output.
*
* *Note:* The following keys will have their contents
* replaced with `*****`:
*
* - password
* - login
* - host
* - database
* - port
* - prefix
* - schema
*
* This is done to protect database credentials, which could be accidentally
* shown in an error message if CakePHP is deployed in development mode.
*
* @param string $var Variable to convert
* @param integer $depth The depth to output to. Defaults to 3.
* @return string Variable as a formatted string
* @link http://book.cakephp.org/2.0/en/development/debugging.html#Debugger::exportVar
*/
public static function exportVar($var, $depth = 3) {
return self::_export($var, $depth, 0);
}

/**
* Protected export function used to keep track of indentation and recursion.
*
* @param mixed $var The variable to dump.
* @param integer $depth The remaining depth.
* @param integer $indent The current indentation level.
* @return string The dumped variable.
*/
protected static function _export($var, $depth, $indent) {
switch (self::getType($var)) {
case 'boolean':
return ($var) ? 'true' : 'false';
case 'integer':
return '(int) ' . $var;
case 'float':
return '(float) ' . $var;
case 'string':
if (trim($var) == '') {
return "''";
}
return "'" . $var . "'";
case 'array':
return self::_array($var, $depth - 1, $indent + 1);
case 'resource':
return strtolower(gettype($var));
case 'null':
return 'null';
default:
return self::_object($var, $depth - 1, $indent + 1);
}
}

/**
* Export an array type object. Filters out keys used in datasource configuration.
*
* The following keys are replaced with ***'s
*
* - password
* - login
* - host
* - database
* - port
* - prefix
* - schema
*
* @param array $var The array to export.
* @param integer $depth The current depth, used for recursion tracking.
* @param integer $indent The current indentation level.
* @return string Exported array.
*/
protected static function _array(array $var, $depth, $indent) {
$secrets = array(
'password' => '*****',
'login' => '*****',
'host' => '*****',
'database' => '*****',
'port' => '*****',
'prefix' => '*****',
'schema' => '*****'
);
$replace = array_intersect_key($secrets, $var);
$var = $replace + $var;

$out = "array(";
$n = $break = $end = null;
if (!empty($var)) {
$n = "\n";
$break = "\n" . str_repeat("\t", $indent);
$end = "\n" . str_repeat("\t", $indent - 1);
}
$vars = array();

if ($depth >= 0) {
foreach ($var as $key => $val) {
// Sniff for globals as !== explodes in < 5.4
if ($key === 'GLOBALS' && is_array($val) && isset($val['GLOBALS'])) {
$val = '[recursion]';
} else if ($val !== $var) {
$val = self::_export($val, $depth, $indent);
}
$vars[] = $break . self::exportVar($key) .
' => ' .
$val;
}
} else {
$vars[] = $break . '[maximum depth reached]';
}
return $out . implode(',', $vars) . $end . ')';
}

/**
* Handles object to string conversion.
*
* @param string $var Object to convert
* @param integer $depth The current depth, used for tracking recursion.
* @param integer $indent The current indentation level.
* @return string
* @see Debugger::exportVar()
*/
protected static function _object($var, $depth, $indent) {
$out = '';
$props = array();

$className = get_class($var);
$out .= 'object(' . $className . ') {';

if ($depth > 0) {
$end = "\n" . str_repeat("\t", $indent - 1);
$break = "\n" . str_repeat("\t", $indent);
$objectVars = get_object_vars($var);
foreach ($objectVars as $key => $value) {
$value = self::_export($value, $depth - 1, $indent);
$props[] = "$key => " . $value;
}
$out .= $break . implode($break, $props) . $end;
}
$out .= '}';
return $out;
}

/**
* Get/Set the output format for Debugger error rendering.
*
* @param string $format The format you want errors to be output as.
* Leave null to get the current format.
* @return mixed Returns null when setting. Returns the current format when getting.
* @throws CakeException when choosing a format that doesn't exist.
*/
public static function outputAs($format = null) {
$self = Debugger::getInstance();
if ($format === null) {
return $self->_outputFormat;
}
if ($format !== false && !isset($self->_templates[$format])) {
throw new CakeException(__d('cake_dev', 'Invalid Debugger output format.'));
}
$self->_outputFormat = $format;
}

/**
* Add an output format or update a format in Debugger.
*
* `Debugger::addFormat('custom', $data);`
*
* Where $data is an array of strings that use String::insert() variable
* replacement. The template vars should be in a `{:id}` style.
* An error formatter can have the following keys:
*
* - 'error' - Used for the container for the error message. Gets the following template
* variables: `id`, `error`, `code`, `description`, `path`, `line`, `links`, `info`
* - 'info' - A combination of `code`, `context` and `trace`. Will be set with
* the contents of the other template keys.
* - 'trace' - The container for a stack trace. Gets the following template
* variables: `trace`
* - 'context' - The container element for the context variables.
* Gets the following templates: `id`, `context`
* - 'links' - An array of HTML links that are used for creating links to other resources.
* Typically this is used to create javascript links to open other sections.
* Link keys, are: `code`, `context`, `help`. See the js output format for an
* example.
* - 'traceLine' - Used for creating lines in the stacktrace. Gets the following
* template variables: `reference`, `path`, `line`
*
* Alternatively if you want to use a custom callback to do all the formatting, you can use
* the callback key, and provide a callable:
*
* `Debugger::addFormat('custom', array('callback' => array($foo, 'outputError'));`
*
* The callback can expect two parameters. The first is an array of all
* the error data. The second contains the formatted strings generated using
* the other template strings. Keys like `info`, `links`, `code`, `context` and `trace`
* will be present depending on the other templates in the format type.
*
* @param string $format Format to use, including 'js' for JavaScript-enhanced HTML, 'html' for
* straight HTML output, or 'txt' for unformatted text.
* @param array $strings Template strings, or a callback to be used for the output format.
* @return The resulting format string set.
*/
public static function addFormat($format, array $strings) {
$self = Debugger::getInstance();
if (isset($self->_templates[$format])) {
if (isset($strings['links'])) {
$self->_templates[$format]['links'] = array_merge(
$self->_templates[$format]['links'],
$strings['links']
);
unset($strings['links']);
}
$self->_templates[$format] = array_merge($self->_templates[$format], $strings);
} else {
$self->_templates[$format] = $strings;
}
return $self->_templates[$format];
}

/**
* Switches output format, updates format strings.
* Can be used to switch the active output format:
*
* @param string $format Format to use, including 'js' for JavaScript-enhanced HTML, 'html' for
* straight HTML output, or 'txt' for unformatted text.
* @param array $strings Template strings to be used for the output format.
* @return string
* @deprecated Use Debugger::outputAs() and Debugger::addFormat(). Will be removed
* in 3.0
*/
public function output($format = null, $strings = array()) {
$self = Debugger::getInstance();
$data = null;

if (is_null($format)) {
return Debugger::outputAs();
}

if (!empty($strings)) {
return Debugger::addFormat($format, $strings);
}

if ($format === true && !empty($self->_data)) {
$data = $self->_data;
$self->_data = array();
$format = false;
}
Debugger::outputAs($format);
return $data;
}

/**
* Takes a processed array of data from an error and displays it in the chosen format.
*
* @param string $data
* @return void
*/
public function outputError($data) {
$defaults = array(
'level' => 0,
'error' => 0,
'code' => 0,
'description' => '',
'file' => '',
'line' => 0,
'context' => array(),
'start' => 2,
);
$data += $defaults;

$files = $this->trace(array('start' => $data['start'], 'format' => 'points'));
$code = '';
$file = null;
if (isset($files[0]['file'])) {
$file = $files[0];
} elseif (isset($files[1]['file'])) {
$file = $files[1];
}
if ($file) {
$code = $this->excerpt($file['file'], $file['line'] - 1, 1);
}
$trace = $this->trace(array('start' => $data['start'], 'depth' => '20'));
$insertOpts = array('before' => '{:', 'after' => '}');
$context = array();
$links = array();
$info = '';

foreach ((array)$data['context'] as $var => $value) {
$context[] = "\${$var} = " . $this->exportVar($value, 3);
}

switch ($this->_outputFormat) {
case false:
$this->_data[] = compact('context', 'trace') + $data;
return;
case 'log':
$this->log(compact('context', 'trace') + $data);
return;
}

$data['trace'] = $trace;
$data['id'] = 'cakeErr' . uniqid();
$tpl = array_merge($this->_templates['base'], $this->_templates[$this->_outputFormat]);

if (isset($tpl['links'])) {
foreach ($tpl['links'] as $key => $val) {
$links[$key] = String::insert($val, $data, $insertOpts);
}
}

if (!empty($tpl['escapeContext'])) {
$context = h($context);
}

$infoData = compact('code', 'context', 'trace');
foreach ($infoData as $key => $value) {
if (empty($value) || !isset($tpl[$key])) {
continue;
}
if (is_array($value)) {
$value = join("\n", $value);
}
$info .= String::insert($tpl[$key], array($key => $value) + $data, $insertOpts);
}
$links = join(' ', $links);

if (isset($tpl['callback']) && is_callable($tpl['callback'])) {
return call_user_func($tpl['callback'], $data, compact('links', 'info'));
}
echo String::insert($tpl['error'], compact('links', 'info') + $data, $insertOpts);
}

/**
* Get the type of the given variable. Will return the classname
* for objects.
*
* @param mixed $var The variable to get the type of
* @return string The type of variable.
*/
public static function getType($var) {
if (is_object($var)) {
return get_class($var);
}
if (is_null($var)) {
return 'null';
}
if (is_string($var)) {
return 'string';
}
if (is_array($var)) {
return 'array';
}
if (is_int($var)) {
return 'integer';
}
if (is_bool($var)) {
return 'boolean';
}
if (is_float($var)) {
return 'float';
}
if (is_resource($var)) {
return 'resource';
}
return 'unknown';
}

/**
* Verifies that the application's salt and cipher seed value has been changed from the default value.
*
* @return void
*/
public static function checkSecurityKeys() {
if (Configure::read('Security.salt') == 'DYhG93b0qyJfIxfs2guVoUubWwvniR2G0FgaC9mi') {
trigger_error(__d('cake_dev', 'Please change the value of \'Security.salt\' in app/Config/core.php to a salt value specific to your application'), E_USER_NOTICE);
}

if (Configure::read('Security.cipherSeed') === '76859309657453542496749683645') {
trigger_error(__d('cake_dev', 'Please change the value of \'Security.cipherSeed\' in app/Config/core.php to a numeric (digits only) seed value specific to your application'), E_USER_NOTICE);
}
}

}
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