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auth.go
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auth.go
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// Copyright (C) 2015-Present Pivotal Software, Inc. All rights reserved.
// This program and the accompanying materials are made available under
// the terms of the 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 auth
import (
"crypto/sha256"
"crypto/subtle"
"net/http"
)
type Wrapper struct {
username []byte
password []byte
}
func NewWrapper(username, password string) *Wrapper {
u := sha256.Sum256([]byte(username))
p := sha256.Sum256([]byte(password))
return &Wrapper{username: u[:], password: p[:]}
}
const notAuthorized = "Not Authorized"
func (wrapper *Wrapper) Wrap(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if !authorized(wrapper, r) {
http.Error(w, notAuthorized, http.StatusUnauthorized)
return
}
handler.ServeHTTP(w, r)
})
}
func (wrapper *Wrapper) WrapFunc(handlerFunc http.HandlerFunc) http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if !authorized(wrapper, r) {
http.Error(w, notAuthorized, http.StatusUnauthorized)
return
}
handlerFunc(w, r)
})
}
func authorized(wrapper *Wrapper, r *http.Request) bool {
username, password, isOk := r.BasicAuth()
u := sha256.Sum256([]byte(username))
p := sha256.Sum256([]byte(password))
return isOk &&
subtle.ConstantTimeCompare(wrapper.username, u[:]) == 1 &&
subtle.ConstantTimeCompare(wrapper.password, p[:]) == 1
}