添加JWT功能，包括创建、获取和验证令牌的实现

include/jwt/jwt.h

@@ -0,0 +1,19 @@
+#ifndef JWT_H
+#define JWT_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    char* create_token(const char* user, const char* secret);
+
+    char* get_payload(const char* token);
+
+    int verify_token(const char* token, const char* secret);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // JWT_H

include/server/types.h

@@ -1,5 +1,5 @@
-#ifndef KQM_TYPES_H
-#define KQM_TYPES_H
+#ifndef SERVER_TYPES_H
+#define SERVER_TYPES_H
 
 #include <civetweb.h>
 
@@ -8,4 +8,4 @@ typedef struct mg_context mg_context;
 typedef struct mg_connection mg_connection;
 typedef struct mg_request_info mg_request_info;
 
-#endif // KQM_TYPES_H
+#endif // SERVER_TYPES_H

src/jwt/jwt.cpp

@@ -0,0 +1,46 @@
+#include "jwt.h"
+
+#include <chrono>
+#include <jwt-cpp/jwt.h>
+
+
+using namespace std::literals::chrono_literals;
+
+extern "C"
+{
+    char* create_token(const char* user_id, const char* secret)
+    {
+        auto token = jwt::create()
+                         .set_type("JWS")
+                         .set_issuer("KeqingMoe")
+                         .set_subject("user_id")
+                         .set_audience("web_client")
+                         .set_expires_at(std::chrono::system_clock::now() + 3s)
+                         .set_payload_claim("user_id", jwt::claim(std::string{user_id}))
+                         .sign(jwt::algorithm::hs256{secret});
+        return strdup(token.c_str());
+    }
+
+    char* get_payload(const char* token)
+    {
+        auto decoded_token = jwt::decode(token);
+        auto payload       = decoded_token.get_payload_claim("user_id").as_string();
+        return strdup(payload.c_str());
+    }
+
+    int verify_token(const char* token, const char* secret)
+    {
+        try {
+            auto decoded_token = jwt::decode(token);
+
+            auto verifier = jwt::verify()
+                                .allow_algorithm(jwt::algorithm::hs256{secret})
+                                .with_issuer("KeqingMoe")
+                                .with_subject("user_id");
+            verifier.verify(decoded_token);
+            return 1;
+        } catch (...) {
+            return 0;
+        }
+    }
+}