package middleware

import (
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
)

const (
	AuthHeader   = "Authorization"
	bearerPrefix = "Bearer "
)

func Auth(token string) gin.HandlerFunc {
	if token == "" {
		return func(c *gin.Context) {}
	}
	return func(c *gin.Context) {
		header := c.GetHeader(AuthHeader)
		if strings.HasPrefix(header, bearerPrefix) {
			header = header[len(bearerPrefix):]
		}

		if header != token {
			c.AbortWithStatus(http.StatusUnauthorized)
		}

		c.Next()
	}
}