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<?php
/*
* This file is part of the Monolog package.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Monolog\Handler;
use Monolog\Formatter\LineFormatter;
/**
* Handler sending logs to browser's javascript console with no browser extension required
*
* @author Olivier Poitrey <rs@dailymotion.com>
*/
class BrowserConsoleHandler extends AbstractProcessingHandler
{
protected static $initialized = false;
protected static $records = array();
/**
* {@inheritDoc}
*
* Formatted output may contain some formatting markers to be transferred to `console.log` using the %c format.
*
* Example of formatted string:
*
* You can do [[blue text]]{color: blue} or [[green background]]{background-color: green; color: white}
*/
protected function getDefaultFormatter()
{
return new LineFormatter('[[%channel%]]{macro: autolabel} [[%level_name%]]{font-weight: bold} %message%');
}
/**
* {@inheritDoc}
*/
protected function write(array $record)
{
// Accumulate records
self::$records[] = $record;
// Register shutdown handler if not already done
if (!self::$initialized) {
self::$initialized = true;
$this->registerShutdownFunction();
}
}
/**
* Convert records to javascript console commands and send it to the browser.
* This method is automatically called on PHP shutdown if output is HTML or Javascript.
*/
public static function send()
{
$format = self::getResponseFormat();
if ($format === 'unknown') {
return;
}
if (count(self::$records)) {
if ($format === 'html') {
self::writeOutput('<script>' . self::generateScript() . '</script>');
} elseif ($format === 'js') {
self::writeOutput(self::generateScript());
}
self::reset();
}
}
/**
* Forget all logged records
*/
public static function reset()
{
self::$records = array();
}
/**
* Wrapper for register_shutdown_function to allow overriding
*/
protected function registerShutdownFunction()
{
if (PHP_SAPI !== 'cli') {
register_shutdown_function(array('Monolog\Handler\BrowserConsoleHandler', 'send'));
}
}
/**
* Wrapper for echo to allow overriding
*
* @param string $str
*/
protected static function writeOutput($str)
{
echo $str;
}
/**
* Checks the format of the response
*
* If Content-Type is set to application/javascript or text/javascript -> js
* If Content-Type is set to text/html, or is unset -> html
* If Content-Type is anything else -> unknown
*
* @return string One of 'js', 'html' or 'unknown'
*/
protected static function getResponseFormat()
{
// Check content type
foreach (headers_list() as $header) {
if (stripos($header, 'content-type:') === 0) {
// This handler only works with HTML and javascript outputs
// text/javascript is obsolete in favour of application/javascript, but still used
if (stripos($header, 'application/javascript') !== false || stripos($header, 'text/javascript') !== false) {
return 'js';
}
if (stripos($header, 'text/html') === false) {
return 'unknown';
}
break;
}
}
return 'html';
}
private static function generateScript()
{
$script = array();
foreach (self::$records as $record) {
$context = self::dump('Context', $record['context']);
$extra = self::dump('Extra', $record['extra']);
if (empty($context) && empty($extra)) {
$script[] = self::call_array('log', self::handleStyles($record['formatted']));
} else {
$script = array_merge($script,
array(self::call_array('groupCollapsed', self::handleStyles($record['formatted']))),
$context,
$extra,
array(self::call('groupEnd'))
);
}
}
return "(function (c) {if (c && c.groupCollapsed) {\n" . implode("\n", $script) . "\n}})(console);";
}
private static function handleStyles($formatted)
{
$args = array(self::quote('font-weight: normal'));
$format = '%c' . $formatted;
preg_match_all('/\[\[(.*?)\]\]\{([^}]*)\}/s', $format, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
foreach (array_reverse($matches) as $match) {
$args[] = self::quote(self::handleCustomStyles($match[2][0], $match[1][0]));
$args[] = '"font-weight: normal"';
$pos = $match[0][1];
$format = substr($format, 0, $pos) . '%c' . $match[1][0] . '%c' . substr($format, $pos + strlen($match[0][0]));
}
array_unshift($args, self::quote($format));
return $args;
}
private static function handleCustomStyles($style, $string)
{
static $colors = array('blue', 'green', 'red', 'magenta', 'orange', 'black', 'grey');
static $labels = array();
return preg_replace_callback('/macro\s*:(.*?)(?:;|$)/', function ($m) use ($string, &$colors, &$labels) {
if (trim($m[1]) === 'autolabel') {
// Format the string as a label with consistent auto assigned background color
if (!isset($labels[$string])) {
$labels[$string] = $colors[count($labels) % count($colors)];
}
$color = $labels[$string];
return "background-color: $color; color: white; border-radius: 3px; padding: 0 2px 0 2px";
}
return $m[1];
}, $style);
}
private static function dump($title, array $dict)
{
$script = array();
$dict = array_filter($dict);
if (empty($dict)) {
return $script;
}
$script[] = self::call('log', self::quote('%c%s'), self::quote('font-weight: bold'), self::quote($title));
foreach ($dict as $key => $value) {
$value = json_encode($value);
if (empty($value)) {
$value = self::quote('');
}
$script[] = self::call('log', self::quote('%s: %o'), self::quote($key), $value);
}
return $script;
}
private static function quote($arg)
{
return '"' . addcslashes($arg, "\"\n\\") . '"';
}
private static function call()
{
$args = func_get_args();
$method = array_shift($args);
return self::call_array($method, $args);
}
private static function call_array($method, array $args)
{
return 'c.' . $method . '(' . implode(', ', $args) . ');';
}
}
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