feat: Wbi sign

2023-07-14 13:38:23 +08:00
parent 180ba11089
commit 8fd1efd8bf
12 changed files with 260 additions and 8 deletions
--- a/lib/utils/wbi_sign.dart
+++ b/lib/utils/wbi_sign.dart
@ -0,0 +1,130 @@
+// Wbi签名 用于生成 REST API 请求中的 w_rid 和 wts 字段
+// https://github.com/SocialSisterYi/bilibili-API-collect/blob/master/docs/misc/sign/wbi.md
+// import md5 from 'md5'
+// import axios from 'axios'
+import 'package:pilipala/http/index.dart';
+import 'package:crypto/crypto.dart';
+import 'dart:convert';
+
+class WbiSign {
+  List mixinKeyEncTab = [
+    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
+  ];
+  // 对 imgKey 和 subKey 进行字符顺序打乱编码
+  String getMixinKey(orig) {
+    String temp = '';
+    for (int i = 0; i < mixinKeyEncTab.length; i++) {
+      temp += orig.split('')[mixinKeyEncTab[i]];
+    }
+    return temp.substring(0, 32);
+  }
+
+  // 为请求参数进行 wbi 签名
+  String encWbi(params, imgKey, subKey) {
+    String mixinKey = getMixinKey(imgKey + subKey);
+    DateTime now = DateTime.now();
+    int currTime = (now.millisecondsSinceEpoch / 1000).round();
+    RegExp chrFilter = RegExp(r"[!\'\(\)*]");
+    List query = [];
+    Map newParams = Map.from(params)..addAll({"wts": currTime}); // 添加 wts 字段
+    // 按照 key 重排参数
+    List keys = newParams.keys.toList()..sort();
+    for (var i in keys) {
+      query.add(
+          '${Uri.encodeComponent(i)}=${Uri.encodeComponent(newParams[i].toString().replaceAll(chrFilter, ''))}');
+    }
+    String queryStr = query.join('&');
+    String wbiSign =
+        md5.convert(utf8.encode(queryStr + mixinKey)).toString(); // 计算 w_rid
+    print('w_rid: $wbiSign');
+    return '$queryStr&w_rid=$wbiSign';
+  }
+
+  // 获取最新的 img_key 和 sub_key
+  static Future<Map<String, dynamic>> getWbiKeys() async {
+    var resp =
+        await Request().get('https://api.bilibili.com/x/web-interface/nav');
+    var jsonContent = resp.data['data'];
+
+    String imgUrl = jsonContent['wbi_img']['img_url'];
+    String subUrl = jsonContent['wbi_img']['sub_url'];
+    return {
+      'imgKey': imgUrl
+          .substring(imgUrl.lastIndexOf('/') + 1, imgUrl.length)
+          .split('.')[0],
+      'subKey': subUrl
+          .substring(subUrl.lastIndexOf('/') + 1, subUrl.length)
+          .split('.')[0]
+    };
+  }
+
+  makSign(Map<String, dynamic> params) async {
+    // params 为需要加密的请求参数
+    Map<String, dynamic> wbiKeys = await getWbiKeys();
+    String query = encWbi(params, wbiKeys['imgKey'], wbiKeys['subKey']);
+    return query;
+  }
+}