Add full refresh token and access token function

Signed-off-by: Asai Neko <sugar@sne.moe>

middleware/jwt.go

@@ -0,0 +1,57 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"nixcn-cms/internal/cryptography"
+
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/spf13/viper"
+)
+
+func JWTAuth() gin.HandlerFunc {
+	jwtSecret := []byte(viper.GetString("secrets.jwt_secret"))
+
+	return func(c *gin.Context) {
+		auth := c.GetHeader("Authorization")
+		if auth == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+				"error": "missing Authorization header",
+			})
+			return
+		}
+
+		// Split header to 2
+		parts := strings.SplitN(auth, " ", 2)
+		if len(parts) != 2 || parts[0] != "Bearer" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+				"error": "invalid Authorization header format",
+			})
+			return
+		}
+
+		tokenStr := parts[1]
+
+		// Verify access token
+		claims := &cryptography.JwtClaims{}
+		token, err := jwt.ParseWithClaims(
+			tokenStr,
+			claims,
+			func(token *jwt.Token) (any, error) {
+				return jwtSecret, nil
+			},
+		)
+
+		if err != nil || !token.Valid {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
+				"error": "invalid or expired token",
+			})
+			return
+		}
+
+		c.Set("user_id", claims.UserID)
+		c.Next()
+	}
+}