48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package httputil
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import (
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"net/http"
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"regexp"
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)
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var corsHeaders = map[string]string{
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"Access-Control-Allow-Headers": "Accept, Authorization, Content-Type, Origin",
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"Access-Control-Allow-Methods": "GET, POST, OPTIONS",
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"Access-Control-Expose-Headers": "Date",
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"Vary": "Origin",
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}
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// Enables cross-site script calls.
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func SetCORS(w http.ResponseWriter, o *regexp.Regexp, r *http.Request) {
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origin := r.Header.Get("Origin")
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if origin == "" {
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return
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}
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for k, v := range corsHeaders {
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w.Header().Set(k, v)
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}
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if o.String() == "^(?:.*)$" {
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w.Header().Set("Access-Control-Allow-Origin", "*")
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return
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}
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if o.MatchString(origin) {
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w.Header().Set("Access-Control-Allow-Origin", origin)
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}
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}
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