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- <?php
- /**
- * Class Minify_JS_ClosureCompiler
- * @package Minify
- */
- /**
- * Minify Javascript using Google's Closure Compiler API
- *
- * @link http://code.google.com/closure/compiler/
- * @package Minify
- * @author Stephen Clay <steve@mrclay.org>
- *
- * @todo can use a stream wrapper to unit test this?
- */
- class Minify_JS_ClosureCompiler {
- /**
- * @var string The option key for the maximum POST byte size
- */
- const OPTION_MAX_BYTES = 'maxBytes';
- /**
- * @var string The option key for additional params. @see __construct
- */
- const OPTION_ADDITIONAL_OPTIONS = 'additionalParams';
- /**
- * @var string The option key for the fallback Minifier
- */
- const OPTION_FALLBACK_FUNCTION = 'fallbackFunc';
- /**
- * @var string The option key for the service URL
- */
- const OPTION_COMPILER_URL = 'compilerUrl';
- /**
- * @var int The default maximum POST byte size according to https://developers.google.com/closure/compiler/docs/api-ref
- */
- const DEFAULT_MAX_BYTES = 200000;
- /**
- * @var string[] $DEFAULT_OPTIONS The default options to pass to the compiler service
- *
- * @note This would be a constant if PHP allowed it
- */
- private static $DEFAULT_OPTIONS = array(
- 'output_format' => 'text',
- 'compilation_level' => 'SIMPLE_OPTIMIZATIONS'
- );
- /**
- * @var string $url URL of compiler server. defaults to Google's
- */
- protected $serviceUrl = 'http://closure-compiler.appspot.com/compile';
- /**
- * @var int $maxBytes The maximum JS size that can be sent to the compiler server in bytes
- */
- protected $maxBytes = self::DEFAULT_MAX_BYTES;
- /**
- * @var string[] $additionalOptions Additional options to pass to the compiler service
- */
- protected $additionalOptions = array();
- /**
- * @var callable Function to minify JS if service fails. Default is JSMin
- */
- protected $fallbackMinifier = array('JSMin', 'minify');
- /**
- * Minify JavaScript code via HTTP request to a Closure Compiler API
- *
- * @param string $js input code
- * @param array $options Options passed to __construct(). @see __construct
- *
- * @return string
- */
- public static function minify($js, array $options = array())
- {
- $obj = new self($options);
- return $obj->min($js);
- }
- /**
- * @param array $options Options with keys available below:
- *
- * fallbackFunc : (callable) function to minify if service unavailable. Default is JSMin.
- *
- * compilerUrl : (string) URL to closure compiler server
- *
- * maxBytes : (int) The maximum amount of bytes to be sent as js_code in the POST request.
- * Defaults to 200000.
- *
- * additionalParams : (string[]) Additional parameters to pass to the compiler server. Can be anything named
- * in https://developers.google.com/closure/compiler/docs/api-ref except for js_code and
- * output_info
- */
- public function __construct(array $options = array())
- {
- if (isset($options[self::OPTION_FALLBACK_FUNCTION])) {
- $this->fallbackMinifier = $options[self::OPTION_FALLBACK_FUNCTION];
- }
- if (isset($options[self::OPTION_COMPILER_URL])) {
- $this->serviceUrl = $options[self::OPTION_COMPILER_URL];
- }
- if (isset($options[self::OPTION_ADDITIONAL_OPTIONS]) && is_array($options[self::OPTION_ADDITIONAL_OPTIONS])) {
- $this->additionalOptions = $options[self::OPTION_ADDITIONAL_OPTIONS];
- }
- if (isset($options[self::OPTION_MAX_BYTES])) {
- $this->maxBytes = (int) $options[self::OPTION_MAX_BYTES];
- }
- }
- /**
- * Call the service to perform the minification
- *
- * @param string $js JavaScript code
- * @return string
- * @throws Minify_JS_ClosureCompiler_Exception
- */
- public function min($js)
- {
- $postBody = $this->buildPostBody($js);
- if ($this->maxBytes > 0) {
- $bytes = (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2))
- ? mb_strlen($postBody, '8bit')
- : strlen($postBody);
- if ($bytes > $this->maxBytes) {
- throw new Minify_JS_ClosureCompiler_Exception(
- 'POST content larger than ' . $this->maxBytes . ' bytes'
- );
- }
- }
- $response = $this->getResponse($postBody);
- if (preg_match('/^Error\(\d\d?\):/', $response)) {
- if (is_callable($this->fallbackMinifier)) {
- // use fallback
- $response = "/* Received errors from Closure Compiler API:\n$response"
- . "\n(Using fallback minifier)\n*/\n";
- $response .= call_user_func($this->fallbackMinifier, $js);
- } else {
- throw new Minify_JS_ClosureCompiler_Exception($response);
- }
- }
- if ($response === '') {
- $errors = $this->getResponse($this->buildPostBody($js, true));
- throw new Minify_JS_ClosureCompiler_Exception($errors);
- }
- return $response;
- }
- /**
- * Get the response for a given POST body
- *
- * @param string $postBody
- * @return string
- * @throws Minify_JS_ClosureCompiler_Exception
- */
- protected function getResponse($postBody)
- {
- $allowUrlFopen = preg_match('/1|yes|on|true/i', ini_get('allow_url_fopen'));
- if ($allowUrlFopen) {
- $contents = file_get_contents($this->serviceUrl, false, stream_context_create(array(
- 'http' => array(
- 'method' => 'POST',
- 'header' => "Content-type: application/x-www-form-urlencoded\r\nConnection: close\r\n",
- 'content' => $postBody,
- 'max_redirects' => 0,
- 'timeout' => 15,
- )
- )));
- } elseif (defined('CURLOPT_POST')) {
- $ch = curl_init($this->serviceUrl);
- curl_setopt($ch, CURLOPT_POST, true);
- curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
- curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-type: application/x-www-form-urlencoded'));
- curl_setopt($ch, CURLOPT_POSTFIELDS, $postBody);
- curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
- curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 15);
- $contents = curl_exec($ch);
- curl_close($ch);
- } else {
- throw new Minify_JS_ClosureCompiler_Exception(
- "Could not make HTTP request: allow_url_open is false and cURL not available"
- );
- }
- if (false === $contents) {
- throw new Minify_JS_ClosureCompiler_Exception(
- "No HTTP response from server"
- );
- }
- return trim($contents);
- }
- /**
- * Build a POST request body
- *
- * @param string $js JavaScript code
- * @param bool $returnErrors
- * @return string
- */
- protected function buildPostBody($js, $returnErrors = false)
- {
- return http_build_query(
- array_merge(
- self::$DEFAULT_OPTIONS,
- $this->additionalOptions,
- array(
- 'js_code' => $js,
- 'output_info' => ($returnErrors ? 'errors' : 'compiled_code')
- )
- ),
- null,
- '&'
- );
- }
- }
- class Minify_JS_ClosureCompiler_Exception extends Exception {}
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