wbi、av2bv、bv2av 的 c++ 实现 (#1035)

* + wbi 添加 c++ demo * + bv<-->av 算法 c++ 实现 * + App API 签名的 C++ 实现
2024-06-13 10:26:03 +08:00
parent 11d42851ae
commit e7ab2d770b
3 changed files with 256 additions and 3 deletions
--- a/docs/misc/sign/APP.md
+++ b/docs/misc/sign/APP.md
@@ -23,7 +23,7 @@

 ## Demo

-该 Demo 提供 [Python](#Python) 和 [Java](#Java) 和 [TS/JS](#TypeScript/JavaScript) 和 [Swift](#Swift) 语言例程
+该 Demo 提供 [Python](#Python)、[Java](#Java)、[TS/JS](#TypeScript/JavaScript)、[Swift](#Swift)、[C++](#CplusPlus) 语言例程

 使用 appkey = `1d8b6e7d45233436`, appsec = `560c52ccd288fed045859ed18bffd973` 对如下 `params` 参数进行签名

@@ -214,3 +214,76 @@ print(signResult)

 输出结果为：01479cf20504d865519ac50f33ba3a7d

+
+
+### CplusPlus
+
+需要 c++ 23 标准库，[cpr](https://github.com/libcpr/cpr)、[cryptopp](https://github.com/weidai11/cryptopp)、[nlohmann/json](https://github.com/nlohmann/json) 等依赖
+
+```c++
+#include <print>    // std::println
+
+/// thrid party libraries
+#include <cpr/cpr.h>            // cpr::util::urlEncode()
+#include <cryptopp/md5.h>
+#include <cryptopp/hex.h>
+#include <nlohmann/json.hpp>
+
+/*
+ * 注意，假定不会发生错误！
+ */
+
+/* 获取 md5 hex(lower) */
+std::string Get_md5_hex(const std::string &Input_str) {
+    CryptoPP::Weak1::MD5 hash;
+    std::string          md5_hex;
+
+    CryptoPP::StringSource ss(Input_str, true,
+        new CryptoPP::HashFilter(hash,
+            new CryptoPP::HexEncoder(
+                new CryptoPP::StringSink(md5_hex)
+            )
+        )
+    );
+
+    std::ranges::for_each(md5_hex, [](char &x) { x = std::tolower(x); });
+    return md5_hex;
+}
+
+/* 将 json 转换为 url 编码字符串 */
+std::string Json_to_url_encode_str(const nlohmann::json &Json) {
+    std::string encode_str;
+    for (const auto &[key, value]: Json.items()) {
+        encode_str.append(key).append("=").append(cpr::util::urlEncode(value.is_string() ? value.get<std::string>() : to_string(value))).append("&");
+    }
+
+    // remove the last '&'
+    encode_str.resize(encode_str.size() - 1, '\0');
+    return encode_str;
+}
+
+std::string App_sign(nlohmann::json &Params, const std::string &App_key, const std::string &App_sec) {
+    Params["appkey"] = App_key;
+    Params["sign"]   = Get_md5_hex(Json_to_url_encode_str(Params) + App_sec);
+    return Json_to_url_encode_str(Params);
+}
+
+int main() {
+    nlohmann::json Params;
+    Params["id"]   = 114514;
+    Params["str"]  = "1919810";
+    Params["test"] = "いいよ，こいよ";
+
+    constexpr auto App_key = "1d8b6e7d45233436";
+    constexpr auto App_sec = "560c52ccd288fed045859ed18bffd973";
+    std::string    sign    = App_sign(Params, App_key, App_sec);
+    std::println("{}", to_string(Params));
+    std::println("{}", sign);
+}
+```
+
+```text
+{"appkey":"1d8b6e7d45233436","id":114514,"sign":"01479cf20504d865519ac50f33ba3a7d","str":"1919810","test":"いいよ，こいよ"}
+appkey=1d8b6e7d45233436&id=114514&sign=01479cf20504d865519ac50f33ba3a7d&str=1919810&test=%E3%81%84%E3%81%84%E3%82%88%EF%BC%8C%E3%81%93%E3%81%84%E3%82%88
+```
+
--- a/docs/misc/sign/wbi.md
+++ b/docs/misc/sign/wbi.md
@@ -120,7 +120,7 @@

 ## Demo

-含 [Python](#Python)、[JavaScript](#JavaScript)、[Golang](#Golang)、[C#](#CSharp)、[Java](#Java) 和 [Swift](#Swift) 语言编写的 Demo 。
+含 [Python](#Python)、[JavaScript](#JavaScript)、[Golang](#Golang)、[C#](#CSharp)、[Java](#Java)、[Swift](#Swift)、[C++](#CPlusPlus) 语言编写的 Demo 。

 ### Python

@@ -934,3 +934,125 @@ func biliWbiSign(param: String, completion: @escaping (String?) -> Void) {
 }

 ```
+
+
+### CPlusPlus
+
+需要 c++ 23 标准库，[cpr](https://github.com/libcpr/cpr)、[cryptopp](https://github.com/weidai11/cryptopp)、[nlohmann/json](https://github.com/nlohmann/json) 等依赖
+
+```c++
+#include <array>    // std::array
+#include <locale>   // std::locale
+#include <print>    // std::println
+
+/// thrid party libraries
+#include <cpr/cpr.h>
+#include <cryptopp/md5.h>
+#include <cryptopp/hex.h>
+#include <nlohmann/json.hpp>
+
+/*
+ * 注意，假定不会发生错误！
+ */
+class Wbi {
+    constexpr static std::array<uint8_t, 64> MIXIN_KEY_ENC_TAB_ = {
+        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
+    };
+
+    /* 获取 md5 hex(lower) */
+    static std::string Get_md5_hex(const std::string &Input_str) {
+        CryptoPP::Weak1::MD5 hash;
+        std::string          md5_hex;
+
+        CryptoPP::StringSource ss(Input_str, true,
+            new CryptoPP::HashFilter(hash,
+                new CryptoPP::HexEncoder(
+                    new CryptoPP::StringSink(md5_hex)
+                )
+            )
+        );
+
+        std::ranges::for_each(md5_hex, [](char &x) { x = std::tolower(x); });
+        return md5_hex;
+    }
+
+public:
+    /* 将 json 转换为 url 编码字符串 */
+    static std::string Json_to_url_encode_str(const nlohmann::json &Json) {
+        std::string encode_str;
+        for (const auto &[key, value]: Json.items()) {
+            encode_str.append(key).append("=").append(cpr::util::urlEncode(value.is_string() ? value.get<std::string>() : to_string(value))).append("&");
+        }
+
+        // remove the last '&'
+        encode_str.resize(encode_str.size() - 1, '\0');
+        return encode_str;
+    }
+
+    /* 获取 wbi key */
+    static std::pair<std::string, std::string> Get_wbi_key() {
+        const auto url    = cpr::Url {"https://api.bilibili.com/x/web-interface/nav"};
+        const auto cookie = cpr::Cookies {
+            {"SESSDATA", "xxxxxxxxxxxx"},
+        };
+        const auto header = cpr::Header {
+            {"User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3"},
+            {"Referer", "https://www.bilibili.com/"},
+        };
+        const auto response = cpr::Get(url, cookie, header);
+
+        nlohmann::json json = nlohmann::json::parse(response.text);
+
+        const std::string img_url = json["data"]["wbi_img"]["img_url"];
+        const std::string sub_url = json["data"]["wbi_img"]["sub_url"];
+
+        std::string img_key = img_url.substr(img_url.find("wbi/") + 4, img_url.find(".png") - img_url.find("wbi/") - 4);
+        std::string sub_key = sub_url.substr(sub_url.find("wbi/") + 4, sub_url.find(".png") - sub_url.find("wbi/") - 4);
+        return {img_key, sub_key};
+    }
+
+    /* 获取 mixin key */
+    static std::string Get_mixin_key(const std::string &Img_key, const std::string &Sub_key) {
+        std::string raw_wbi_key_str = Img_key + Sub_key;
+        std::string result;
+
+        std::ranges::for_each(MIXIN_KEY_ENC_TAB_, [&result, &raw_wbi_key_str](const uint8_t x) {
+            result.push_back(raw_wbi_key_str.at(x));
+        });
+
+        return result.substr(0, 32);
+    }
+
+    /* 计算签名(w_rid) */
+    static std::string Calc_sign(nlohmann::json &Params, const std::string &Mixin_key) {
+        Params["wts"] = std::chrono::duration_cast<std::chrono::seconds>(std::chrono::system_clock::now().time_since_epoch()).count();
+
+        const std::string encode_str = Json_to_url_encode_str(Params).append(Mixin_key);
+        return Get_md5_hex(encode_str);
+    }
+};
+
+
+int main() {
+    nlohmann::json Params;
+    // qn=32&fnver=0&fnval=4048&fourk=1&avid=1755630705&cid=1574294582
+    Params["qn"]    = 32;
+    Params["fnver"] = 0;
+    Params["fnval"] = 4048;
+    Params["fourk"] = 1;
+    Params["avid"]  = 1755630705;
+    Params["cid"]   = 1574294582;
+
+    auto       [img_key, sub_key] = Wbi::Get_wbi_key();
+    const auto mixin_key          = Wbi::Get_mixin_key(img_key, sub_key);
+    const auto w_rid              = Wbi::Calc_sign(Params, mixin_key);
+    std::println("{}", Wbi::Json_to_url_encode_str(Params) + "&w_rid=" + w_rid);
+}
+```
+
+```text
+avid=1755630705&cid=1574294582&fnval=4048&fnver=0&fourk=1&qn=32&wts=1717922933&w_rid=43571b838a1611fa121189083cfc1784
+```