package utils

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

// https://github.com/labstack/echo/blob/98ca08e7dd64075b858e758d6693bf9799340756/context.go#L275-L294
func GetScheme(c *gin.Context) string {
	// Can't use `r.Request.URL.Scheme`
	// See: https://groups.google.com/forum/#!topic/golang-nuts/pMUkBlQBDF0
	if c.Request.TLS != nil {
		return "https"
	}
	if scheme := c.Request.Header.Get("X-Forwarded-Proto"); scheme != "" {
		return scheme
	}
	if scheme := c.Request.Header.Get("X-Forwarded-Protocol"); scheme != "" {
		return scheme
	}
	if ssl := c.Request.Header.Get("X-Forwarded-Ssl"); ssl == "on" {
		return "https"
	}
	if scheme := c.Request.Header.Get("X-Url-Scheme"); scheme != "" {
		return scheme
	}
	return "http"
}

func GetCallbackURL(c *gin.Context) string {
	scheme := GetScheme(c)
	host := c.Request.Host
	return scheme + "://" + host + "/api/oauth_callback"
}