php微信小程序解包过程实例详解

这个解包只能看个大概

1.找到小程序压缩包

1.1、手机root或安装模拟器(我用的是夜神)

1.2、在模拟器上安装微信(用android5系统的模拟器，低版本小程序容易打不开)

1.3、打开登陆微信后，打开小程序

1.4、打开模拟器自带的文件管理器来到目录：/data/data/com.tencent.mm/micromsg/{{一串32位的16进制字符串文件夹}}/appbrand/pkg/

1.5、里面有很多wxapkg文件，找到最新修改日期的文件比如 -357038350_91.wxapkg，前面打勾选中

1.6、文件管理器回到/mnt/shared/other目录，粘贴即可，打开安卓模拟器上我的电脑 =〉打开电脑文件夹找到粘贴的文件-357038350_91.wxapkg 夜神教程链接：跳转查看

2.对压缩包解包

详细参考：https://codechina.csdn.net/mirrors/leo9960/wechat-app-unpack?utm_source=csdn_github_accelerator

我用的php类：

使用方法：cmd =>cd php文件目录 =〉php wx_unpak.php 357038350_91.wxapkg

我主要是想用其中的一些图片，很多图片都被base64了放到js(app-service.js)和样式(app-wxss.js)文件中了；需要我们匹配组装一下

<?php
$str = file_get_contents('_-357038350_97.wxapkg.unpacked/app-service.js');
$preg = '/(data:image.*?)\"/';
$len = strlen('data:image/png;base64,');
if(preg_match_all($preg, $str, $arr)){
  foreach($arr[1] as $k => $img){
    file_put_contents('./images/'.$k.'.png',base64_decode(substr($img,$len)));
    //echo substr($img,$len);exit;
  }
} else {
  echo 'no';
}

$str = file_get_contents('_-357038350_97.wxapkg.unpacked/app-wxss.js');
$preg = '/\((data:image.*?)\)/';
$len = strlen('data:image/png;base64,');
if(preg_match_all($preg, $str, $arr)){
  foreach($arr[1] as $k => $img){
    file_put_contents('./images/a2_'.$k.'.png',base64_decode(substr($img,$len)));
    //echo substr($img,$len);exit;
  }
} else {
  echo 'no';
}

wx_unpak.php

<?php
/**
源文件目录
  /data/data/com.tencent.mm/micromsg/{{一串32位的16进制字符串文件夹}}/appbrand/pkg/
  /data/data/com.eg.android.alipaygphone, 在files/nebulainstallapps/目录下存储了所有加载过的小程序
 * [php] /path/to/unpack-wxapkg.php <xxx.wxapkg>
 * php unpak.php _1123949441_351.wxapkg
 */

function unpack_wxapkg($file, $targetdir)
{
  if (!is_dir($targetdir)){
    mkdir($targetdir);
  }

  echo "reading file.\n";
  $file = file_get_contents($file);
  $ptr = 18;

  $headerstruct = new structdef([
    'mask1' => 'ushort',
    'info1' => 'ulong',
    'indexinfolength' => 'ulong',
    'bodyinfolength' => 'ushort',
    'mask2' => 'ushort',
    'filecount' => 'ulong',
  ]);

  echo "parsing file header...\n";

  $header = $headerstruct->unpack($file);
//  print_r(['header' => $header]);

  $unpackulong = function () use (&$file, &$ptr) {
    $ret = unpack_ulong(substr($file, $ptr, 4));
    $ptr += 4;
    return $ret;
  };

  $unpackushort = function () use (&$file, &$ptr) {
    $ret = unpack_ushort(substr($file, $ptr, 2));
    $ptr += 2;
    return $ret;
  };


  $unpackstr = function ($len) use (&$file, &$ptr) {
    $ret = substr($file, $ptr, $len);
    $ptr += $len;
    return $ret;
  };


  $filecount = $header['filecount'];

  echo "got $filecount files.\n";

  $unpackedfiles = [];

  for ($i = 0; $i < $filecount; $i++) {
    $namelength = $unpackulong();
    $f = [
      'namelength' => $namelength,
      'name' => $unpackstr($namelength),
      'offset' => $unpackulong(),
      'size' => $unpackulong(),
    ];

    echo "unpacking file {$f['name']} ({$f['size']}bytes)...\n";

    $f['content'] = substr($file, $f['offset'], $f['size']);
    $unpackedfiles[] = $f;

    $destfile = $targetdir . $f['name'];
    $destdir = dirname($destfile);
    if (!is_dir($destdir)){
      mkdir($destdir, 0777, true);
    }

    file_put_contents($targetdir . $f['name'], $f['content']);
  }


//  print_r(['unpackedfiles' => $unpackedfiles]);



  echo "all done.\n";
}

function unpack_ulong($str)
{
  $x = unpack('n', $str);
  return $x[1];
}

function unpack_ushort($str)
{
  $x = unpack('n', $str);
  return $x[1];
}

class structdef
{
  protected $def;
  protected $unpackformat;

  public function __construct($def)
  {
    $this->def = $def;
    $this->unpackformat = self::convertstructdeftounpackformat($def);
  }

  public function unpack($data)
  {
    return unpack($this->unpackformat, $data);
  }

  protected static function convertstructdeftounpackformat($def)
  {
    $deftypetounpacktype = [
      'byte' => 'c',
      'uchar' => 'c',
      'u8' => 'c',
      'ushort' => 'n',
      'u16' => 'n',
      'ulong' => 'n',
      'u32' => 'n',
    ];

    $ret = [];
    foreach ($def as $key => $type) {
      $ret[] = $deftypetounpacktype[$type] . $key;
    }

    return implode('/', $ret);
  }
}

$packagefile = $argv[1];

//支持目录下文件批量解压
 if (is_dir($packagefile)){
  $handle = opendir($packagefile);
  if($handle){
    while(($fl = readdir($handle)) !== false){
      $temp = $packagefile.directory_separator.$fl;
      //如果不加 $fl!='.' && $fl != '..' 则会造成把$dir的父级目录也读取出来
      if(is_file($temp)){
        if($fl!='.' && $fl != '..'){
          $targetdir = $temp . '.unpacked';
          unpack_wxapkg($temp, $targetdir);
        }
      }
    }
  } 
}else if (is_file($packagefile)){
  $targetdir = $packagefile . '.unpacked';
  unpack_wxapkg($packagefile, $targetdir);
}else{
  echo <<<help
usage:
  [php] {$argv[0]} <xxx.wxapkg>
  - unpack the `xxx.wxapkg` to `xxx.wxapkg.unpacked` directory.
help;

  exit(1);
}

exit(0);

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