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// Copyright 2018 The etcd 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 etcdserver
import "sync"
// AccessController controls etcd server HTTP request access.
type AccessController struct {
corsMu sync.RWMutex
CORS map[string]struct{}
hostWhitelistMu sync.RWMutex
HostWhitelist map[string]struct{}
}
// NewAccessController returns a new "AccessController" with default "*" values.
func NewAccessController() *AccessController {
return &AccessController{
CORS: map[string]struct{}{"*": {}},
HostWhitelist: map[string]struct{}{"*": {}},
}
}
// OriginAllowed determines whether the server will allow a given CORS origin.
// If CORS is empty, allow all.
func (ac *AccessController) OriginAllowed(origin string) bool {
ac.corsMu.RLock()
defer ac.corsMu.RUnlock()
if len(ac.CORS) == 0 { // allow all
return true
}
_, ok := ac.CORS["*"]
if ok {
return true
}
_, ok = ac.CORS[origin]
return ok
}
// IsHostWhitelisted returns true if the host is whitelisted.
// If whitelist is empty, allow all.
func (ac *AccessController) IsHostWhitelisted(host string) bool {
ac.hostWhitelistMu.RLock()
defer ac.hostWhitelistMu.RUnlock()
if len(ac.HostWhitelist) == 0 { // allow all
return true
}
_, ok := ac.HostWhitelist["*"]
if ok {
return true
}
_, ok = ac.HostWhitelist[host]
return ok
}
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