77 lines
2.5 KiB
Markdown
77 lines
2.5 KiB
Markdown
```python
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import json
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import hashlib
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import base64
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from typing import Any, Dict
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def build_sign(params: Dict[str, Any], secret_key: str) -> str:
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"""
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生成签名
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:param secret_key: 交易密钥
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:return: 计算得到的sign值
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"""
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# 1. 剔除值为None的键值对，并处理嵌套对象
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def process_value(value: Any) -> str:
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if isinstance(value, dict):
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# 处理对象：过滤null，排序键
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filtered_obj = {k: v for k, v in value.items() if v is not None}
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# 按键排序
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sorted_keys = sorted(filtered_obj.keys())
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sorted_obj = {k: filtered_obj[k] for k in sorted_keys}
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# 序列化为紧凑JSON
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return json.dumps(sorted_obj, separators=(',', ':'), ensure_ascii=False)
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elif isinstance(value, (list, tuple)):
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# 列表/元组，直接序列化为紧凑JSON
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return json.dumps(value, separators=(',', ':'), ensure_ascii=False)
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else:
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# 基本类型：字符串、数字、布尔
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return str(value)
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# 对顶层参数进行相同的处理：剔除值=null/空，剔除key="sign"，并处理嵌套对象
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filtered_params = {}
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for key, value in params.items():
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if value is None or value == "" or key == "sign":
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continue
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filtered_params[key] = process_value(value)
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# 2. 按键ASCII升序排序
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sorted_keys = sorted(filtered_params.keys())
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# 3. 拼接成 stringA：key1=value1&key2=value2&...
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stringA_parts = []
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for key in sorted_keys:
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value = filtered_params[key]
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# 值如果是字符串，直接使用；否则（理论上不会）转换为字符串
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stringA_parts.append(f"{key}={value}")
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stringA = "&".join(stringA_parts)
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# 4. 追加 &key=密钥
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sign_str = stringA + f"&key={secret_key}"
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# 5. MD5运算
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md5_hash = hashlib.md5(sign_str.encode('utf-8')).digest()
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# 6. 转小写（MD5结果通常是十六进制字符串，这里需要先转十六进制再小写）
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md5_hex = md5_hash.hex().lower()
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# 7. Base64编码
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sign = base64.b64encode(md5_hex.encode('utf-8')).decode('utf-8')
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return sign
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# 示例用法
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if __name__ == "__main__":
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# 假设请求参数如下
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params = {
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"reqSerialNo": "20260318110810747",
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"data": {
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"merchantId": "******",
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"applyAmount": 10000,
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"reqId": "******",
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}
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}
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secret_key = "******" # 替换为实际的交易密钥
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sign = build_sign(params, secret_key)
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print(sign)
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```
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