php微信小程式解包過程例項詳解

阿新 • • 發佈：2021-04-05

這個解包只能看個大概

1.找到小程式壓縮包

1.1、手機root或安裝模擬器(我用的是夜神)

1.2、在模擬器上安裝微信(用android5系統的模擬器，低版本小程式容易打不開)

1.3、開啟登陸微信後，開啟小程式

1.4、開啟模擬器自帶的檔案管理器來到目錄：/data/data/com.tencent.mm/MicroMsg/{{一串32位的16進位制字串資料夾}}/appbrand/pkg/

1.5、裡面有很多wxapkg檔案，找到最新修改日期的檔案比如 -357038350_91.wxapkg，前面打勾選中

1.6、檔案管理器回到/mnt/shared/Other目錄，貼上即可，開啟安卓模擬器上我的電腦 =〉開啟電腦資料夾找到貼上的檔案-357038350_91.wxapkg 夜神教程連結：跳轉檢視

2.對壓縮包解包

詳細參考：https://codechina.csdn.net/mirrors/leo9960/wechat-app-unpack?utm_source=csdn_github_accelerator

我用的php類：

使用方法：cmd =>cd php檔案目錄 =〉php wx_unpak.php 357038350_91.wxapkg

我主要是想用其中的一些圖片，很多圖片都被base64了放到js(app-service.js)和樣式(app-wxss.js)檔案中了；需要我們匹配組裝一下

<?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  
程式設計客棧'no';
}

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

wx_unpak.php

<?php
/**
原始檔目錄
  /data/data/com.tencent.mm/MicroMsg/{{一串32位的16進位制字串資料夾}}/appbrand/pkg/
  /data/data/com.eg.android.AlipayGphone,在files/nebu 
程式設計客棧laInstallApps/目錄下儲存了所有載入過的小程式
 * [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,2));
    $ptr += 2;
    return $ret;
  };


  $unpackStr = function ($len) use (&$file,&$ptr) {
    $ret = substr($file,$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];

//支援目錄下檔案批量解壓
 if (is_dir($packageFile)){
  $handle = opendir($packageFile);
  if($handle){
    while(($fl = readdir($handle)) !== false){
      $temp = $packageFile.DIRECTORY_SEPARATOR.$fl;
      //如果不加 $fl!='.' && $fl != '..' 則會造成把$dir的父級目錄也讀取出來
      if(is_file($temp)){
    程式設計客棧    if($fl!='.' && $fl != '..'){
          $targetDir = $temp . '.unpacked';
          unpack_wxapkg($temp,$targetDir);
        }
      }
    }
  } 
}else if (is_file($packageFile)){
  $targetDir = $packaghttp://www.cppcns.comeFile . '.unpacked';
  unpack_wxapkg($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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