<?php declare(strict_types=1);
/*
* This file is part of the Monolog package.
*
* (c) Jordi Boggiano <[email protected]>
*
* 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;
use Monolog\Formatter\FormatterInterface;
use Monolog\Utils;
/**
* Handler sending logs to browser's javascript console with no browser extension required
*
* @author Olivier Poitrey <[email protected]>
*/
class BrowserConsoleHandler extends AbstractProcessingHandler
{
protected static $initialized = false;
protected static $records = [];
/**
* {@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(): FormatterInterface
{
return new LineFormatter('[[%channel%]]{macro: autolabel} [[%level_name%]]{font-weight: bold} %message%');
}
/**
* {@inheritDoc}
*/
protected function write(array $record): void
{
// Accumulate records
static::$records[] = $record;
// Register shutdown handler if not already done
if (!static::$initialized) {
static::$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(): void
{
$format = static::getResponseFormat();
if ($format === 'unknown') {
return;
}
if (count(static::$records)) {
if ($format === 'html') {
static::writeOutput('<script>' . static::generateScript() . '</script>');
} elseif ($format === 'js') {
static::writeOutput(static::generateScript());
}
static::resetStatic();
}
}
public function close(): void
{
self::resetStatic();
}
public function reset()
{
parent::reset();
self::resetStatic();
}
/**
* Forget all logged records
*/
public static function resetStatic(): void
{
static::$records = [];
}
/**
* Wrapper for register_shutdown_function to allow overriding
*/
protected function registerShutdownFunction(): void
{
if (PHP_SAPI !== 'cli') {
register_shutdown_function(['Monolog\Handler\BrowserConsoleHandler', 'send']);
}
}
/**
* Wrapper for echo to allow overriding
*/
protected static function writeOutput(string $str): void
{
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(): string
{
// 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(): string
{
$script = [];
foreach (static::$records as $record) {
$context = static::dump('Context', $record['context']);
$extra = static::dump('Extra', $record['extra']);
if (empty($context) && empty($extra)) {
$script[] = static::call_array('log', static::handleStyles($record['formatted']));
} else {
$script = array_merge(
$script,
[static::call_array('groupCollapsed', static::handleStyles($record['formatted']))],
$context,
$extra,
[static::call('groupEnd')]
);
}
}
return "(function (c) {if (c && c.groupCollapsed) {\n" . implode("\n", $script) . "\n}})(console);";
}
private static function handleStyles(string $formatted): array
{
$args = [];
$format = '%c' . $formatted;
preg_match_all('/\[\[(.*?)\]\]\{([^}]*)\}/s', $format, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
foreach (array_reverse($matches) as $match) {
$args[] = '"font-weight: normal"';
$args[] = static::quote(static::handleCustomStyles($match[2][0], $match[1][0]));
$pos = $match[0][1];
$format = Utils::substr($format, 0, $pos) . '%c' . $match[1][0] . '%c' . Utils::substr($format, $pos + strlen($match[0][0]));
}
$args[] = static::quote('font-weight: normal');
$args[] = static::quote($format);
return array_reverse($args);
}
private static function handleCustomStyles(string $style, string $string): string
{
static $colors = ['blue', 'green', 'red', 'magenta', 'orange', 'black', 'grey'];
static $labels = [];
return preg_replace_callback('/macro\s*:(.*?)(?:;|$)/', function (array $m) use ($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(string $title, array $dict): array
{
$script = [];
$dict = array_filter($dict);
if (empty($dict)) {
return $script;
}
$script[] = static::call('log', static::quote('%c%s'), static::quote('font-weight: bold'), static::quote($title));
foreach ($dict as $key => $value) {
$value = json_encode($value);
if (empty($value)) {
$value = static::quote('');
}
$script[] = static::call('log', static::quote('%s: %o'), static::quote((string) $key), $value);
}
return $script;
}
private static function quote(string $arg): string
{
return '"' . addcslashes($arg, "\"\n\\") . '"';
}
private static function call(...$args): string
{
$method = array_shift($args);
return static::call_array($method, $args);
}
private static function call_array(string $method, array $args): string
{
return 'c.' . $method . '(' . implode(', ', $args) . ');';
}
}