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 
 * 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 <<
  - Unpack the `xxx.wxapkg` to `xxx.wxapkg.unpacked` directory.
HELP;

  exit(1);
}

exit(0);

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