mirror of
https://github.com/dutchcoders/transfer.sh.git
synced 2020-11-18 19:53:40 -08:00
110 lines
2.8 KiB
Go
110 lines
2.8 KiB
Go
// 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 proxyauth provides authentication support via the
|
|
// Proxy-Authorization header.
|
|
package proxyauth
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"net/http"
|
|
"strings"
|
|
|
|
"github.com/google/martian"
|
|
"github.com/google/martian/auth"
|
|
)
|
|
|
|
var noop = martian.Noop("proxyauth.Modifier")
|
|
|
|
// Modifier is the proxy authentication modifier.
|
|
type Modifier struct {
|
|
reqmod martian.RequestModifier
|
|
resmod martian.ResponseModifier
|
|
}
|
|
|
|
// NewModifier returns a new proxy 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)
|
|
|
|
actx.SetID(id(req.Header))
|
|
|
|
err := m.reqmod.ModifyRequest(req)
|
|
|
|
if actx.Error() != nil {
|
|
ctx.SkipRoundTrip()
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
// ModifyResponse runs resmod.ModifyResponse and modifies the response to
|
|
// include the correct status code and headers if auth error is present.
|
|
//
|
|
// 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 = http.StatusProxyAuthRequired
|
|
res.Header.Set("Proxy-Authenticate", "Basic")
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
// id returns an ID derived from the Proxy-Authorization header username and password.
|
|
func id(header http.Header) string {
|
|
id := strings.TrimPrefix(header.Get("Proxy-Authorization"), "Basic ")
|
|
|
|
data, err := base64.StdEncoding.DecodeString(id)
|
|
if err != nil {
|
|
return ""
|
|
}
|
|
|
|
return string(data)
|
|
}
|