woodpecker/server/metrics/prometheus.go

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// Copyright 2018 Drone.IO Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package metrics
import (
"errors"
"fmt"
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"github.com/drone/drone/server"
"github.com/gin-gonic/gin"
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"github.com/prometheus/client_golang/prometheus/promhttp"
)
var (
// errInvalidToken is returned when the api request token is invalid.
errInvalidToken = errors.New("Invalid or missing token")
)
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// PromHandler will pass the call from /api/metrics/prometheus to prometheus
func PromHandler() gin.HandlerFunc {
handler := promhttp.Handler()
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return func(c *gin.Context) {
token := server.Config.Prometheus.Token
if token == "" {
handler.ServeHTTP(c.Writer, c.Request)
return
}
header := c.Request.Header.Get("Authorization")
if header == "" {
c.String(401, errInvalidToken.Error())
return
}
bearer := fmt.Sprintf("Bearer %s", token)
if header != bearer {
c.String(401, errInvalidToken.Error())
return
}
handler.ServeHTTP(c.Writer, c.Request)
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}
}