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// Package rejectmethods provides middleware to reject HTTP requests with unknown methods
package rejectmethods
import (
"net/http"
"github.com/prometheus/client_golang/prometheus"
)
var acceptedMethods = map[string]bool{
http.MethodGet: true,
http.MethodHead: true,
http.MethodPost: true,
http.MethodPut: true,
http.MethodPatch: true,
http.MethodDelete: true,
http.MethodConnect: true,
http.MethodOptions: true,
http.MethodTrace: true,
}
var rejectedRequestsCount = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "gitlab_workhorse_unknown_method_rejected_requests",
Help: "The number of requests with unknown HTTP method which were rejected",
},
)
// NewMiddleware returns middleware which rejects all unknown http methods
func NewMiddleware(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if acceptedMethods[r.Method] {
handler.ServeHTTP(w, r)
} else {
rejectedRequestsCount.Inc()
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
}
})
}
|
