112 lines
3.2 KiB
Go
112 lines
3.2 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package transport/http supports network connections to HTTP servers.
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// This package is not intended for use by end developers. Use the
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// google.golang.org/api/option package to configure API clients.
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package http
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import (
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"errors"
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"net/http"
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"golang.org/x/net/context"
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"golang.org/x/oauth2"
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"google.golang.org/api/googleapi/transport"
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"google.golang.org/api/internal"
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"google.golang.org/api/option"
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)
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// NewClient returns an HTTP client for use communicating with a Google cloud
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// service, configured with the given ClientOptions. It also returns the endpoint
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// for the service as specified in the options.
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func NewClient(ctx context.Context, opts ...option.ClientOption) (*http.Client, string, error) {
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var o internal.DialSettings
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for _, opt := range opts {
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opt.Apply(&o)
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}
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if err := o.Validate(); err != nil {
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return nil, "", err
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}
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if o.GRPCConn != nil {
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return nil, "", errors.New("unsupported gRPC connection specified")
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}
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// TODO(cbro): consider injecting the User-Agent even if an explicit HTTP client is provided?
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if o.HTTPClient != nil {
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return o.HTTPClient, o.Endpoint, nil
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}
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uat := userAgentTransport{
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base: baseTransport(ctx),
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userAgent: o.UserAgent,
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}
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var hc *http.Client
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switch {
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case o.NoAuth:
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hc = &http.Client{Transport: uat}
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case o.APIKey != "":
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hc = &http.Client{
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Transport: &transport.APIKey{
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Key: o.APIKey,
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Transport: uat,
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},
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}
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default:
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creds, err := internal.Creds(ctx, &o)
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if err != nil {
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return nil, "", err
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}
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hc = &http.Client{
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Transport: &oauth2.Transport{
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Source: creds.TokenSource,
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Base: uat,
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},
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}
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}
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return hc, o.Endpoint, nil
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}
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type userAgentTransport struct {
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userAgent string
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base http.RoundTripper
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}
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func (t userAgentTransport) RoundTrip(req *http.Request) (*http.Response, error) {
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rt := t.base
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if rt == nil {
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return nil, errors.New("transport: no Transport specified")
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}
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if t.userAgent == "" {
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return rt.RoundTrip(req)
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}
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newReq := *req
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newReq.Header = make(http.Header)
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for k, vv := range req.Header {
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newReq.Header[k] = vv
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}
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// TODO(cbro): append to existing User-Agent header?
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newReq.Header["User-Agent"] = []string{t.userAgent}
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return rt.RoundTrip(&newReq)
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}
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// Set at init time by dial_appengine.go. If nil, we're not on App Engine.
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var appengineUrlfetchHook func(context.Context) http.RoundTripper
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// baseTransport returns the base HTTP transport.
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// On App Engine, this is urlfetch.Transport, otherwise it's http.DefaultTransport.
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func baseTransport(ctx context.Context) http.RoundTripper {
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if appengineUrlfetchHook != nil {
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return appengineUrlfetchHook(ctx)
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}
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return http.DefaultTransport
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}
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