feat: B站爬虫签名实现

media_platform/bilibili/help.py

@@ -0,0 +1,71 @@
+# -*- coding: utf-8 -*-
+# @Author  : relakkes@gmail.com
+# @Time    : 2023/12/2 23:26
+# @Desc    : bilibili 请求参数签名
+# 逆向实现参考：https://socialsisteryi.github.io/bilibili-API-collect/docs/misc/sign/wbi.html#wbi%E7%AD%BE%E5%90%8D%E7%AE%97%E6%B3%95
+import urllib.parse
+from hashlib import md5
+from typing import Dict
+
+from tools import utils
+
+
+class BilibiliSign:
+    def __init__(self, img_key: str, sub_key: str):
+        self.img_key = img_key
+        self.sub_key = sub_key
+        self.map_table = [
+            46, 47, 18, 2, 53, 8, 23, 32, 15, 50, 10, 31, 58, 3, 45, 35, 27, 43, 5, 49,
+            33, 9, 42, 19, 29, 28, 14, 39, 12, 38, 41, 13, 37, 48, 7, 16, 24, 55, 40,
+            61, 26, 17, 0, 1, 60, 51, 30, 4, 22, 25, 54, 21, 56, 59, 6, 63, 57, 62, 11,
+            36, 20, 34, 44, 52
+        ]
+
+    def get_salt(self) -> str:
+        """
+        获取加盐的 key
+        :return:
+        """
+        salt = ""
+        mixin_key = self.img_key + self.sub_key
+        for mt in self.map_table:
+            salt += mixin_key[mt]
+        return salt[:32]
+
+    def sign(self, req_data: Dict) -> Dict:
+        """
+        请求参数中加上当前时间戳对请求参数中的key进行字典序排序
+        再将请求参数进行 url 编码集合 salt 进行 md5 就可以生成w_rid参数了
+        :param req_data:
+        :return:
+        """
+        current_ts = utils.get_unix_timestamp()
+        req_data.update({"wts": current_ts})
+        req_data = dict(sorted(req_data.items()))
+        req_data = {
+            # 过滤 value 中的 "!'()*" 字符
+            k: ''.join(filter(lambda ch: ch not in "!'()*", str(v)))
+            for k, v
+            in req_data.items()
+        }
+        query = urllib.parse.urlencode(req_data)
+        salt = self.get_salt()
+        wbi_sign = md5((query + salt).encode()).hexdigest()  # 计算 w_rid
+        req_data['w_rid'] = wbi_sign
+        # print(urllib.parse.urlencode(req_data))
+        return req_data
+
+
+if __name__ == '__main__':
+    _img_key = "7cd084941338484aae1ad9425b84077c"
+    _sub_key = "4932caff0ff746eab6f01bf08b70ac45"
+    _search_url = "category_id=&search_type=video&ad_resource=5654&__refresh__=true&_extra=&context=&page=1&page_size=42&order=click&from_source=&from_spmid=333.337&platform=pc&highlight=1&single_column=0&keyword=python&qv_id=OQ8f2qtgYdBV1UoEnqXUNUl8LEDAdzsD&source_tag=3&gaia_vtoken=&dynamic_offset=0&web_location=1430654"
+    _req_data = dict()
+    for params in _search_url.split("&"):
+        kvalues = params.split("=")
+        key = kvalues[0]
+        value = kvalues[1]
+        _req_data[key] = value
+    print("pre req_data", _req_data)
+    _req_data = BilibiliSign(img_key=_img_key, sub_key=_sub_key).sign(req_data=_req_data)
+    print(_req_data)