Bump google.golang.org/api

vendor/github.com/google/martian/proxyauth/proxyauth.go

@@ -0,0 +1,109 @@
+// 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)
+}