prometheus/util/httputil/cors.go

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// Copyright 2013 The Prometheus Authors
// 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 httputil
import (
"net/http"
"regexp"
)
var corsHeaders = map[string]string{
"Access-Control-Allow-Headers": "Accept, Authorization, Content-Type, Origin",
"Access-Control-Allow-Methods": "GET, POST, OPTIONS",
"Access-Control-Expose-Headers": "Date",
"Vary": "Origin",
}
// SetCORS enables cross-site script calls.
func SetCORS(w http.ResponseWriter, o *regexp.Regexp, r *http.Request) {
origin := r.Header.Get("Origin")
if origin == "" {
return
}
for k, v := range corsHeaders {
w.Header().Set(k, v)
}
if o.String() == "^(?:.*)$" {
w.Header().Set("Access-Control-Allow-Origin", "*")
return
}
if o.MatchString(origin) {
w.Header().Set("Access-Control-Allow-Origin", origin)
}
}