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// Copyright 2015 Google Inc. All rights reserved.
//
// 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 ipauth provides a martian.Modifier that sets auth based on IP.
package ipauth
import (
"net"
"net/http"
"github.com/google/martian"
"github.com/google/martian/auth"
)
var noop = martian.Noop("ipauth.Modifier")
// Modifier is the IP authentication modifier.
type Modifier struct {
reqmod martian.RequestModifier
resmod martian.ResponseModifier
}
// NewModifier returns a new IP authentication modifier.
func NewModifier() *Modifier {
return &Modifier{
reqmod: noop,
resmod: noop,
}
}
// SetRequestModifier sets the request modifier.
func (m *Modifier) SetRequestModifier(reqmod martian.RequestModifier) {
if reqmod == nil {
reqmod = noop
}
m.reqmod = reqmod
}
// SetResponseModifier sets the response modifier.
func (m *Modifier) SetResponseModifier(resmod martian.ResponseModifier) {
if resmod == nil {
resmod = noop
}
m.resmod = resmod
}
// ModifyRequest sets the auth ID in the context from the request iff it has
// not already been set and runs reqmod.ModifyRequest. If the underlying
// modifier has indicated via auth error that no valid auth credentials
// have been found we set ctx.SkipRoundTrip.
func (m *Modifier) ModifyRequest(req *http.Request) error {
ctx := martian.NewContext(req)
actx := auth.FromContext(ctx)
ip, _, err := net.SplitHostPort(req.RemoteAddr)
if err != nil {
ip = req.RemoteAddr
}
actx.SetID(ip)
err = m.reqmod.ModifyRequest(req)
if actx.Error() != nil {
ctx.SkipRoundTrip()
}
return err
}
// ModifyResponse runs resmod.ModifyResponse.
//
// If an error is returned from resmod.ModifyResponse it is returned.
func (m *Modifier) ModifyResponse(res *http.Response) error {
ctx := martian.NewContext(res.Request)
actx := auth.FromContext(ctx)
err := m.resmod.ModifyResponse(res)
if actx.Error() != nil {
res.StatusCode = 403
res.Status = http.StatusText(403)
}
return err
}
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