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# 编码配置解码
## 识别信号
1. API 返回有 `_encoded: true` 标志
2. `definition` 字段是 Base64 字符串而非 JSON
3. JS 中有 `atob()`/`btoa()` + `TextEncoder`/`TextDecoder` + XOR
4. Runtime config 中有 `obfuscationKey`
```bash
grep -oE '(atob|btoa|obfuscation|_encoded)' /tmp/*.js | sort | uniq -c
grep -oE 'obfuscationKey:"[^"]*"' /tmp/page.html
```
## 常见方案
### Base64 + XOR
```python
import base64, json
def decode(encoded, key):
raw = base64.b64decode(encoded)
key_bytes = key.encode('utf-8')
decrypted = bytes([raw[i] ^ key_bytes[i % len(key_bytes)] for i in range(len(raw))])
return json.loads(decrypted.decode('utf-8'))
```
### 短码映射(组件/属性名缩写)
配置中 `C74`/`p29` 代替 `StudioBackground`/`color`
```bash
grep -oE '(codeToComponent|codeToProp)' /tmp/bundle.js
```
映射表通常是动态生成的——所有名称按字母排序分配 `C{nn}`/`p{nn}` 编号。
## 密钥来源
| 框架 | 位置 |
|------|------|
| Nuxt.js | `public:{obfuscationKey:"..."}` in HTML |
| Next.js | `__NEXT_DATA__` 的 runtimeConfig |
| SPA | bundle 常量或 `window.__CONFIG__` |
## 查找解码函数
```bash
grep -l '_encoded' /tmp/*.js
grep -A3 '_encoded' /tmp/bundle.js
# 模式if (t._encoded) { return decode(t.definition, key) }
```