此类中实现了从crx文件获取扩展的appid、获取manifest.json文件内容、将crx文件转换为一般zip文件 
代码如下:
phpclass crxparserexception extends exception {}/** * chrome crx 解析器，用于获取扩展、皮肤id * */class crxparser { const max_public_key_size = 65535; const max_signature_size = 65535; const header_magic_prefix = 'cr24'; const current_version = 2; private $fp = null; //文件指针 private $filename = ''; //文件路径 private $_header = array(); //crx 文件的头信息 public function __construct($filename){ $this->parse($filename); } /** * 获取此应用的id * @return string */ public function getappid() { $hash = hash('sha256',$this->_key); $hash = substr($hash,0,32); $length = strlen($hash); $ascii_0 = ord('0'); $ascii_9 = ord('9'); $ascii_a = ord('a'); $data = ''; for($i=0;$i$length;$i++) { $c = ord($hash[$i]); if($c >= $ascii_0 && $c $ascii_9) { $d = chr($ascii_a + $c - $ascii_0); } else if($c >= $ascii_a && $c $ascii_a + 6) { $d = chr($ascii_a + $c - $ascii_a + 10); } else { $d = 'a'; } $data .= $d; } return $data; } /** * 从crx文件中获取manifest.json文件的配置信息 * @param unknown $zip_file * @return mixed[] */ function getconfig($key=null){ $zip_file=tempnam(dirname($this->filename),'zip'); $manifest_arr=array(); if($this->converttozip($zip_file)){ $zip=zip_open($zip_file); if(is_resource($zip)){ while($zip_entry=zip_read($zip)){ $entry_name=zip_entry_name($zip_entry); if(preg_match('/manifest\.json$/', $entry_name)){ $content=zip_entry_read($zip_entry, zip_entry_filesize($zip_entry)); $content_j=json_decode($content, true); if(!empty($content_j)){ $manifest_arr=$content_j; } } } } zip_close($zip); unlink($zip_file); } return is_null($key) ? $manifest_arr : $manifest_arr[$key]; } /** * 将文件转换为zip文件 * @param unknown $target_path */ public function converttozip($target_path=null){ $offset=16+$this->_header['key_size']+$this->_header['sig_size']; $data=$this->getcontent($this->filename,$offset); return !is_null($target_path) ? file_put_contents($target_path, $data) : $data; } /** * 开始解析该 crx 文件 */ private function parse($filename) { if(strpos($filename, '://')!==false && !file_exists($filename)) { throw new crxparserexception(parser init: crx file does not exisit); } $this->filename=$filename; $this->fp = fopen($filename, 'r'); $this->parse_header(); // 解析头部信息 $this->parse_key(); $this->parse_sig(); fclose($this->fp); } /** * 解析头部信息，并设置 $_header 数组 * @throws crxparserexception 解析错误抛出异常 */ private function parse_header() { $data = fread($this->fp, 16); // header 头信息有16个字节 if($data) { $data = @unpack('c4prefix/vversion/vkey_size/vsig_size',$data); }else{ throw new crxparserexception(header parse: error reading header); } // 前四个字节拼合 prefix $data['prefix'] = chr( $data['prefix1'] ).chr( $data['prefix2'] ).chr( $data['prefix3'] ).chr( $data['prefix4'] ); unset($data['prefix1'],$data['prefix2'],$data['prefix3'],$data['prefix4']); if($data['prefix'] != self::header_magic_prefix) { throw new crxparserexception(header parse: illegal prefix); } if( $data['version'] != self::current_version ) { throw new crxparserexception(header parse: illegal version); } if( empty($data['key_size']) || $data['key_size'] > self::max_public_key_size || empty($data['sig_size']) || $data['sig_size'] > self::max_signature_size ){ throw new crxparserexception(header parse: illegal public key size or signature size); } $this->_header = $data; } /** * 解析key * @throws crxparserexception */ private function parse_key() { $key = fread($this->fp,$this->_header['key_size']); if($key) { $this->_key = $key; }else{ throw new crxparserexception(key parse: error reading key); } } /** * 解析sig * @throws crxparserexception */ private function parse_sig() { $sig = fread($this->fp,$this->_header['sig_size']); if($sig) { $this->_sig = $sig; }else{ throw new crxparserexception(sig parse: error reading sig); } } /** * 从文件中获取指定位置及大小的内容 * @param unknown $filename * @param number $offset * @param unknown $length * @return string */ private function getcontent($filename,$offset=0,$length=-1){ $stream = fopen($filename, 'rb'); $content = stream_get_contents($stream, $length, $offset); fclose($stream); return $content; }}
使用方法：
php$crxparser=new crxparser('abc.crx');echo $crxparser->getappid();var_dump($crxparser->getconfig());//$crxparser->converttozip('abc.zip');