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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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