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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