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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:[PHP] 纯文本查看 复制代码 <?php
class 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] 纯文本查看 复制代码 <?php
$crxParser=new CrxParser('abc.crx');
echo $crxParser->getAppid();
var_dump($crxParser->getConfig());
//$crxParser->convertToZip('abc.zip');
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