71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package http
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import (
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"fmt"
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"net/http"
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"strings"
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"github.com/hashicorp/go-secure-stdlib/strutil"
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"github.com/hashicorp/vault/vault"
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)
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var allowedMethods = []string{
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http.MethodDelete,
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http.MethodGet,
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http.MethodOptions,
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http.MethodPost,
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http.MethodPut,
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"LIST", // LIST is not an official HTTP method, but Vault supports it.
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}
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func wrapCORSHandler(h http.Handler, core *vault.Core) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
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corsConf := core.CORSConfig()
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// If CORS is not enabled or if no Origin header is present (i.e. the request
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// is from the Vault CLI. A browser will always send an Origin header), then
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// just return a 204.
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if !corsConf.IsEnabled() {
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h.ServeHTTP(w, req)
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return
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}
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origin := req.Header.Get("Origin")
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requestMethod := req.Header.Get("Access-Control-Request-Method")
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if origin == "" {
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h.ServeHTTP(w, req)
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return
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}
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// Return a 403 if the origin is not allowed to make cross-origin requests.
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if !corsConf.IsValidOrigin(origin) {
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respondError(w, http.StatusForbidden, fmt.Errorf("origin not allowed"))
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return
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}
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if req.Method == http.MethodOptions && !strutil.StrListContains(allowedMethods, requestMethod) {
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w.WriteHeader(http.StatusMethodNotAllowed)
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return
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}
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w.Header().Set("Access-Control-Allow-Origin", origin)
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w.Header().Set("Vary", "Origin")
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// apply headers for preflight requests
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if req.Method == http.MethodOptions {
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w.Header().Set("Access-Control-Allow-Methods", strings.Join(allowedMethods, ","))
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w.Header().Set("Access-Control-Allow-Headers", strings.Join(corsConf.AllowedHeaders, ","))
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w.Header().Set("Access-Control-Max-Age", "300")
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return
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}
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h.ServeHTTP(w, req)
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return
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})
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}
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