/
http.go
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/
http.go
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// Copyright © 2021 The Things Network Foundation, The Things Industries B.V.
//
// 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// 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.
package ratelimit
import (
"net"
"net/http"
"go.thethings.network/lorawan-stack/v3/pkg/webhandlers"
)
const httpXRealIPHeader = "X-Real-IP"
func httpRemoteIP(r *http.Request) string {
if xRealIP := r.Header.Get(httpXRealIPHeader); xRealIP != "" {
return xRealIP
}
host, _, _ := net.SplitHostPort(r.RemoteAddr)
return host
}
// HTTPMiddleware is an HTTP middleware that rate limits by remote IP and the request URL.
// The remote IP is retrieved by the X-Real-IP header. Use this middleware after webmiddleware.ProxyHeaders()
func HTTPMiddleware(limiter Interface, class string) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
resource := httpRequestResource(r, class)
limit, result := limiter.RateLimit(resource)
result.SetHTTPHeaders(w.Header())
if limit {
webhandlers.Error(w, r, errRateLimitExceeded.WithAttributes("key", resource.Key(), "rate", result.Limit))
return
}
next.ServeHTTP(w, r)
})
}
}