1 files changed, 33 insertions, 0 deletions
diff --git a/routers/web/metrics.go b/routers/web/metrics.go
new file mode 100644
index 0000000..46c13f0
--- /dev/null
+++ b/routers/web/metrics.go
@@ -0,0 +1,33 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package web
+
+import (
+	"crypto/subtle"
+	"net/http"
+
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+// Metrics validate auth token and render prometheus metrics
+func Metrics(resp http.ResponseWriter, req *http.Request) {
+	if setting.Metrics.Token == "" {
+		promhttp.Handler().ServeHTTP(resp, req)
+		return
+	}
+	header := req.Header.Get("Authorization")
+	if header == "" {
+		http.Error(resp, "", http.StatusUnauthorized)
+		return
+	}
+	got := []byte(header)
+	want := []byte("Bearer " + setting.Metrics.Token)
+	if subtle.ConstantTimeCompare(got, want) != 1 {
+		http.Error(resp, "", http.StatusUnauthorized)
+		return
+	}
+	promhttp.Handler().ServeHTTP(resp, req)
+}