Feat: Add JWT config, auth middleware, and token parsing using username.

Signed-off-by: Goldbro233 <bowensun_06@outlook.com>

middlewares/auth_middleware.go

@@ -0,0 +1,28 @@
+package middlewares
+
+import (
+	"GinTutorial/utils"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+func AuthMiddleWare() gin.HandlerFunc {
+	return func(ctx *gin.Context) {
+		token := ctx.GetHeader("Authorization")
+		if token == "" {
+			ctx.JSON(http.StatusUnauthorized, gin.H{"message": "Token is empty"})
+			ctx.Abort()
+			return
+		}
+		username, err := utils.ParseToken(token)
+
+		if err != nil {
+			ctx.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid Token"})
+			ctx.Abort()
+			return
+		}
+		ctx.Set("username", username)
+		ctx.Next()
+	}
+}