mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-09-07 09:36:44 +00:00
162 lines
4.7 KiB
Go
162 lines
4.7 KiB
Go
// Copyright 2015 Google LLC
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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 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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"context"
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"errors"
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"net/http"
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"go.opencensus.io/plugin/ochttp"
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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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"google.golang.org/api/transport/http/internal/propagation"
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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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settings, err := newSettings(opts)
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if err != nil {
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return nil, "", err
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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 settings.HTTPClient != nil {
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return settings.HTTPClient, settings.Endpoint, nil
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}
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trans, err := newTransport(ctx, defaultBaseTransport(ctx), settings)
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if err != nil {
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return nil, "", err
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}
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return &http.Client{Transport: trans}, settings.Endpoint, nil
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}
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// NewTransport creates an http.RoundTripper for use communicating with a Google
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// cloud service, configured with the given ClientOptions. Its RoundTrip method delegates to base.
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func NewTransport(ctx context.Context, base http.RoundTripper, opts ...option.ClientOption) (http.RoundTripper, error) {
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settings, err := newSettings(opts)
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if err != nil {
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return nil, err
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}
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if settings.HTTPClient != nil {
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return nil, errors.New("transport/http: WithHTTPClient passed to NewTransport")
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}
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return newTransport(ctx, base, settings)
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}
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func newTransport(ctx context.Context, base http.RoundTripper, settings *internal.DialSettings) (http.RoundTripper, error) {
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trans := base
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trans = parameterTransport{
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base: trans,
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userAgent: settings.UserAgent,
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quotaProject: settings.QuotaProject,
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requestReason: settings.RequestReason,
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}
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trans = addOCTransport(trans)
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switch {
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case settings.NoAuth:
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// Do nothing.
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case settings.APIKey != "":
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trans = &transport.APIKey{
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Transport: trans,
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Key: settings.APIKey,
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}
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default:
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creds, err := internal.Creds(ctx, settings)
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if err != nil {
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return nil, err
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}
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trans = &oauth2.Transport{
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Base: trans,
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Source: creds.TokenSource,
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}
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}
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return trans, nil
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}
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func newSettings(opts []option.ClientOption) (*internal.DialSettings, 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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return &o, nil
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}
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type parameterTransport struct {
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userAgent string
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quotaProject string
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requestReason string
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base http.RoundTripper
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}
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func (t parameterTransport) 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.Set("User-Agent", t.userAgent)
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// Attach system parameters into the header
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if t.quotaProject != "" {
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newReq.Header.Set("X-Goog-User-Project", t.quotaProject)
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}
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if t.requestReason != "" {
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newReq.Header.Set("X-Goog-Request-Reason", t.requestReason)
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}
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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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// defaultBaseTransport 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 defaultBaseTransport(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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func addOCTransport(trans http.RoundTripper) http.RoundTripper {
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return &ochttp.Transport{
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Base: trans,
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Propagation: &propagation.HTTPFormat{},
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}
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}
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