node-api/auth.go

package main

import (
	"strings"

	"github.com/labstack/echo/v4"
)

var skipPaths []string = []string{"/metrics"}

// TokenMiddleware handles authentication
func TokenMiddleware(next echo.HandlerFunc) echo.HandlerFunc {
	return func(c echo.Context) error {
		// Skip selected paths
		var skip bool
		for _, path := range skipPaths {
			if path == c.Request().URL.Path {
				skip = true
			}
		}

		tokenHeader := c.Request().Header.Get("Authorization")
		token := strings.Replace(tokenHeader, "Token ", "", -1)

		if token == "" && !skip {
			token = c.QueryParam("token")
		}

		if (token != config.Token || config.Token == "") && !skip {
			return c.JSONPretty(403, map[string]string{"message": "access denied"}, " ")
		}

		if err := next(c); err != nil {
			c.Error(err)
		}

		return nil
	}
}