1 files changed, 223 insertions, 0 deletions
diff --git a/vendor/google.golang.org/api/transport/http/dial.go b/vendor/google.golang.org/api/transport/http/dial.go
new file mode 100644
index 0000000..cab709f
--- /dev/null
+++ b/vendor/google.golang.org/api/transport/http/dial.go
@@ -0,0 +1,223 @@
+// Copyright 2015 Google LLC.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package http supports network connections to HTTP servers.
+// This package is not intended for use by end developers. Use the
+// google.golang.org/api/option package to configure API clients.
+package http
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"net"
+	"net/http"
+	"time"
+
+	"go.opencensus.io/plugin/ochttp"
+	"golang.org/x/oauth2"
+	"google.golang.org/api/googleapi/transport"
+	"google.golang.org/api/internal"
+	"google.golang.org/api/option"
+	"google.golang.org/api/transport/cert"
+	"google.golang.org/api/transport/http/internal/propagation"
+	"google.golang.org/api/transport/internal/dca"
+)
+
+// NewClient returns an HTTP client for use communicating with a Google cloud
+// service, configured with the given ClientOptions. It also returns the endpoint
+// for the service as specified in the options.
+func NewClient(ctx context.Context, opts ...option.ClientOption) (*http.Client, string, error) {
+	settings, err := newSettings(opts)
+	if err != nil {
+		return nil, "", err
+	}
+	clientCertSource, endpoint, err := dca.GetClientCertificateSourceAndEndpoint(settings)
+	if err != nil {
+		return nil, "", err
+	}
+	// TODO(cbro): consider injecting the User-Agent even if an explicit HTTP client is provided?
+	if settings.HTTPClient != nil {
+		return settings.HTTPClient, endpoint, nil
+	}
+	trans, err := newTransport(ctx, defaultBaseTransport(ctx, clientCertSource), settings)
+	if err != nil {
+		return nil, "", err
+	}
+	return &http.Client{Transport: trans}, endpoint, nil
+}
+
+// NewTransport creates an http.RoundTripper for use communicating with a Google
+// cloud service, configured with the given ClientOptions. Its RoundTrip method delegates to base.
+func NewTransport(ctx context.Context, base http.RoundTripper, opts ...option.ClientOption) (http.RoundTripper, error) {
+	settings, err := newSettings(opts)
+	if err != nil {
+		return nil, err
+	}
+	if settings.HTTPClient != nil {
+		return nil, errors.New("transport/http: WithHTTPClient passed to NewTransport")
+	}
+	return newTransport(ctx, base, settings)
+}
+
+func newTransport(ctx context.Context, base http.RoundTripper, settings *internal.DialSettings) (http.RoundTripper, error) {
+	paramTransport := &parameterTransport{
+		base:          base,
+		userAgent:     settings.UserAgent,
+		quotaProject:  settings.QuotaProject,
+		requestReason: settings.RequestReason,
+	}
+	var trans http.RoundTripper = paramTransport
+	trans = addOCTransport(trans, settings)
+	switch {
+	case settings.NoAuth:
+		// Do nothing.
+	case settings.APIKey != "":
+		trans = &transport.APIKey{
+			Transport: trans,
+			Key:       settings.APIKey,
+		}
+	default:
+		creds, err := internal.Creds(ctx, settings)
+		if err != nil {
+			return nil, err
+		}
+		if paramTransport.quotaProject == "" {
+			paramTransport.quotaProject = internal.QuotaProjectFromCreds(creds)
+		}
+
+		ts := creds.TokenSource
+		if settings.ImpersonationConfig == nil && settings.TokenSource != nil {
+			ts = settings.TokenSource
+		}
+		trans = &oauth2.Transport{
+			Base:   trans,
+			Source: ts,
+		}
+	}
+	return trans, nil
+}
+
+func newSettings(opts []option.ClientOption) (*internal.DialSettings, error) {
+	var o internal.DialSettings
+	for _, opt := range opts {
+		opt.Apply(&o)
+	}
+	if err := o.Validate(); err != nil {
+		return nil, err
+	}
+	if o.GRPCConn != nil {
+		return nil, errors.New("unsupported gRPC connection specified")
+	}
+	return &o, nil
+}
+
+type parameterTransport struct {
+	userAgent     string
+	quotaProject  string
+	requestReason string
+
+	base http.RoundTripper
+}
+
+func (t *parameterTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	rt := t.base
+	if rt == nil {
+		return nil, errors.New("transport: no Transport specified")
+	}
+	newReq := *req
+	newReq.Header = make(http.Header)
+	for k, vv := range req.Header {
+		newReq.Header[k] = vv
+	}
+	if t.userAgent != "" {
+		// TODO(cbro): append to existing User-Agent header?
+		newReq.Header.Set("User-Agent", t.userAgent)
+	}
+
+	// Attach system parameters into the header
+	if t.quotaProject != "" {
+		newReq.Header.Set("X-Goog-User-Project", t.quotaProject)
+	}
+	if t.requestReason != "" {
+		newReq.Header.Set("X-Goog-Request-Reason", t.requestReason)
+	}
+
+	return rt.RoundTrip(&newReq)
+}
+
+// Set at init time by dial_appengine.go. If nil, we're not on App Engine.
+var appengineUrlfetchHook func(context.Context) http.RoundTripper
+
+// defaultBaseTransport returns the base HTTP transport.
+// On App Engine, this is urlfetch.Transport.
+// Otherwise, use a default transport, taking most defaults from
+// http.DefaultTransport.
+// If TLSCertificate is available, set TLSClientConfig as well.
+func defaultBaseTransport(ctx context.Context, clientCertSource cert.Source) http.RoundTripper {
+	if appengineUrlfetchHook != nil {
+		return appengineUrlfetchHook(ctx)
+	}
+
+	// Copy http.DefaultTransport except for MaxIdleConnsPerHost setting,
+	// which is increased due to reported performance issues under load in the GCS
+	// client. Transport.Clone is only available in Go 1.13 and up.
+	trans := clonedTransport(http.DefaultTransport)
+	if trans == nil {
+		trans = fallbackBaseTransport()
+	}
+	trans.MaxIdleConnsPerHost = 100
+
+	if clientCertSource != nil {
+		trans.TLSClientConfig = &tls.Config{
+			GetClientCertificate: clientCertSource,
+		}
+	}
+
+	// If possible, configure http2 transport in order to use ReadIdleTimeout
+	// setting. This can only be done in Go 1.16 and up.
+	configureHTTP2(trans)
+
+	return trans
+}
+
+// fallbackBaseTransport is used in <go1.13 as well as in the rare case if
+// http.DefaultTransport has been reassigned something that's not a
+// *http.Transport.
+func fallbackBaseTransport() *http.Transport {
+	return &http.Transport{
+		Proxy: http.ProxyFromEnvironment,
+		DialContext: (&net.Dialer{
+			Timeout:   30 * time.Second,
+			KeepAlive: 30 * time.Second,
+			DualStack: true,
+		}).DialContext,
+		MaxIdleConns:          100,
+		MaxIdleConnsPerHost:   100,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+	}
+}
+
+func addOCTransport(trans http.RoundTripper, settings *internal.DialSettings) http.RoundTripper {
+	if settings.TelemetryDisabled {
+		return trans
+	}
+	return &ochttp.Transport{
+		Base:        trans,
+		Propagation: &propagation.HTTPFormat{},
+	}
+}
+
+// clonedTransport returns the given RoundTripper as a cloned *http.Transport.
+// It returns nil if the RoundTripper can't be cloned or coerced to
+// *http.Transport.
+func clonedTransport(rt http.RoundTripper) *http.Transport {
+	t, ok := rt.(*http.Transport)
+	if !ok {
+		return nil
+	}
+	return t.Clone()
+}