1// Copyright 2018 The Gitea Authors. All rights reserved.
2// Use of this source code is governed by a MIT-style
3// license that can be found in the LICENSE file.
4
5package web
6
7import (
8	"crypto/subtle"
9	"net/http"
10
11	"code.gitea.io/gitea/modules/setting"
12
13	"github.com/prometheus/client_golang/prometheus/promhttp"
14)
15
16// Metrics validate auth token and render prometheus metrics
17func Metrics(resp http.ResponseWriter, req *http.Request) {
18	if setting.Metrics.Token == "" {
19		promhttp.Handler().ServeHTTP(resp, req)
20		return
21	}
22	header := req.Header.Get("Authorization")
23	if header == "" {
24		http.Error(resp, "", 401)
25		return
26	}
27	got := []byte(header)
28	want := []byte("Bearer " + setting.Metrics.Token)
29	if subtle.ConstantTimeCompare(got, want) != 1 {
30		http.Error(resp, "", 401)
31		return
32	}
33	promhttp.Handler().ServeHTTP(resp, req)
34}
35