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wbi、av2bv、bv2av 的 c++ 实现 (#1035)
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* + wbi 添加 c++ demo

* + bv<-->av 算法 c++ 实现

* + App API 签名的 C++ 实现
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@YuHuanTin
YuHuanTin authored Jun 13, 2024
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60 changes: 59 additions & 1 deletion docs/misc/bvid_desc.md
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### 格式

“bvid”恒为长度为 12 的字符串，前两个固定为“BV1”，后 9 个为 base58 计算结果（不包含数字 `0` 和大写字母 `I`、 `O` 以及小写字母 `l`）
“bvid”恒为长度为 12 的字符串，前 3 个固定为“BV1”，后 9 个为 base58 计算结果（不包含数字 `0` 和大写字母 `I`、 `O` 以及小写字母 `l`）

### 实质

Expand Down Expand Up @@ -328,6 +328,64 @@ public class AVBVConverter {
```

### C++
```c++
#include <algorithm>
#include <cassert>
#include <print>
#include <string>

constexpr int64_t XOR_CODE = 0x1552356C4CDB;
constexpr int64_t MAX_AID = 0x8000000000000;
constexpr int64_t MASK_CODE = MAX_AID - 1;
constexpr int64_t BASE = 58;
constexpr char Table[BASE + 1] = "FcwAPNKTMug3GV5Lj7EJnHpWsx4tb8haYeviqBz6rkCy12mUSDQX9RdoZf";
constexpr char ReverseTable[128] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x2c, 0x2d, 0x0b, 0x1a, 0x0e, 0x27, 0x11, 0x1d, 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x03, 0x25, 0x2a, 0x31, 0x12, 0x00, 0x0c, 0x15, 0x00, 0x13, 0x06, 0x0f, 0x08, 0x05, 0x00,
0x04, 0x32, 0x35, 0x30, 0x07, 0x2f, 0x0d, 0x17, 0x33, 0x20, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x1f, 0x1c, 0x01, 0x36, 0x21, 0x39, 0x0a, 0x1e, 0x23, 0x10, 0x29, 0x00, 0x2e, 0x14, 0x37,
0x16, 0x24, 0x28, 0x18, 0x1b, 0x09, 0x22, 0x02, 0x19, 0x2b, 0x26, 0x00, 0x00, 0x00, 0x00, 0x00
};

std::string Av2bv(const int64_t Avid) {
assert(Avid > 0 && "Avid must be greater than 0");
std::string bv = "BV1";
bv.resize(12, '\0');

int64_t tmp = (Avid | MAX_AID) ^ XOR_CODE;
for (size_t i = bv.size() - 1; tmp > 0 && i > 2; --i) {
bv[i] = Table[tmp % BASE];
tmp /= BASE;
}
std::ranges::swap(bv.at(3), bv.at(9));
std::ranges::swap(bv.at(4), bv.at(7));
return bv;
}

int64_t Bv2av(const std::string &Bvid) {
assert(Bvid.starts_with("BV1") && "Bvid must start with 'BV1'");

auto Bvid_ = Bvid;
std::ranges::swap(Bvid_.at(3), Bvid_.at(9));
std::ranges::swap(Bvid_.at(4), Bvid_.at(7));

int64_t tmp = 0;
for (int i = 3; i < Bvid_.size(); ++i) {
tmp = ReverseTable[Bvid_.at(i)] + BASE * tmp;
}
return (tmp & MASK_CODE) ^ XOR_CODE;
}

int main() {
assert(Av2bv(1004871019) == "BV16x4y1H7M1");
assert(Bv2av("BV16x4y1H7M1") == 1004871019);
}
```
## 老版算法存档
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75 changes: 74 additions & 1 deletion docs/misc/sign/APP.md
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## 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

Expand Down Expand Up @@ -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
```

124 changes: 123 additions & 1 deletion docs/misc/sign/wbi.md
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## 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

Expand Down Expand Up @@ -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
```

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