chore: migrate to gitea

vendor/google.golang.org/api/transport/http/dial.go

@@ -0,0 +1,324 @@
+// 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"
+
+	"cloud.google.com/go/auth"
+	"cloud.google.com/go/auth/credentials"
+	"cloud.google.com/go/auth/httptransport"
+	"cloud.google.com/go/auth/oauth2adapt"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+	"golang.org/x/net/http2"
+	"golang.org/x/oauth2"
+	"google.golang.org/api/googleapi/transport"
+	"google.golang.org/api/internal"
+	"google.golang.org/api/internal/cert"
+	"google.golang.org/api/option"
+)
+
+// 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, dialTLSContext, endpoint, err := internal.GetHTTPTransportConfigAndEndpoint(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
+	}
+
+	if settings.IsNewAuthLibraryEnabled() {
+		client, err := newClientNewAuth(ctx, nil, settings)
+		if err != nil {
+			return nil, "", err
+		}
+		return client, endpoint, nil
+	}
+	trans, err := newTransport(ctx, defaultBaseTransport(ctx, clientCertSource, dialTLSContext), settings)
+	if err != nil {
+		return nil, "", err
+	}
+	return &http.Client{Transport: trans}, endpoint, nil
+}
+
+// newClientNewAuth is an adapter to call new auth library.
+func newClientNewAuth(ctx context.Context, base http.RoundTripper, ds *internal.DialSettings) (*http.Client, error) {
+	// honor options if set
+	var creds *auth.Credentials
+	if ds.InternalCredentials != nil {
+		creds = oauth2adapt.AuthCredentialsFromOauth2Credentials(ds.InternalCredentials)
+	} else if ds.Credentials != nil {
+		creds = oauth2adapt.AuthCredentialsFromOauth2Credentials(ds.Credentials)
+	} else if ds.AuthCredentials != nil {
+		creds = ds.AuthCredentials
+	} else if ds.TokenSource != nil {
+		credOpts := &auth.CredentialsOptions{
+			TokenProvider: oauth2adapt.TokenProviderFromTokenSource(ds.TokenSource),
+		}
+		if ds.QuotaProject != "" {
+			credOpts.QuotaProjectIDProvider = auth.CredentialsPropertyFunc(func(ctx context.Context) (string, error) {
+				return ds.QuotaProject, nil
+			})
+		}
+		creds = auth.NewCredentials(credOpts)
+	}
+
+	var skipValidation bool
+	// If our clients explicitly setup the credential skip validation as it is
+	// assumed correct
+	if ds.SkipValidation || ds.InternalCredentials != nil {
+		skipValidation = true
+	}
+
+	// Defaults for older clients that don't set this value yet
+	defaultEndpointTemplate := ds.DefaultEndpointTemplate
+	if defaultEndpointTemplate == "" {
+		defaultEndpointTemplate = ds.DefaultEndpoint
+	}
+
+	var aud string
+	if len(ds.Audiences) > 0 {
+		aud = ds.Audiences[0]
+	}
+	headers := http.Header{}
+	if ds.QuotaProject != "" {
+		headers.Set("X-goog-user-project", ds.QuotaProject)
+	}
+	if ds.RequestReason != "" {
+		headers.Set("X-goog-request-reason", ds.RequestReason)
+	}
+	if ds.UserAgent != "" {
+		headers.Set("User-Agent", ds.UserAgent)
+	}
+	credsJSON, _ := ds.GetAuthCredentialsJSON()
+	credsFile, _ := ds.GetAuthCredentialsFile()
+	client, err := httptransport.NewClient(&httptransport.Options{
+		DisableTelemetry:      ds.TelemetryDisabled,
+		DisableAuthentication: ds.NoAuth,
+		Headers:               headers,
+		Endpoint:              ds.Endpoint,
+		APIKey:                ds.APIKey,
+		Credentials:           creds,
+		ClientCertProvider:    ds.ClientCertSource,
+		BaseRoundTripper:      base,
+		DetectOpts: &credentials.DetectOptions{
+			Scopes:          ds.Scopes,
+			Audience:        aud,
+			CredentialsFile: credsFile,
+			CredentialsJSON: credsJSON,
+			Logger:          ds.Logger,
+		},
+		InternalOptions: &httptransport.InternalOptions{
+			EnableJWTWithScope:      ds.EnableJwtWithScope,
+			DefaultAudience:         ds.DefaultAudience,
+			DefaultEndpointTemplate: defaultEndpointTemplate,
+			DefaultMTLSEndpoint:     ds.DefaultMTLSEndpoint,
+			DefaultScopes:           ds.DefaultScopes,
+			SkipValidation:          skipValidation,
+			TelemetryAttributes:     ds.TelemetryAttributes,
+		},
+		UniverseDomain: ds.UniverseDomain,
+		Logger:         ds.Logger,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return client, 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")
+	}
+	if settings.IsNewAuthLibraryEnabled() {
+		client, err := newClientNewAuth(ctx, base, settings)
+		if err != nil {
+			return nil, err
+		}
+		return client.Transport, nil
+	}
+	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,
+		requestReason: settings.RequestReason,
+	}
+	var trans http.RoundTripper = paramTransport
+	trans = addOpenTelemetryTransport(trans, settings)
+	switch {
+	case settings.NoAuth:
+		// Do nothing.
+	case settings.APIKey != "":
+		paramTransport.quotaProject = internal.GetQuotaProject(nil, settings.QuotaProject)
+		trans = &transport.APIKey{
+			Transport: trans,
+			Key:       settings.APIKey,
+		}
+	default:
+		creds, err := internal.Creds(ctx, settings)
+		if err != nil {
+			return nil, err
+		}
+		paramTransport.quotaProject = internal.GetQuotaProject(creds, settings.QuotaProject)
+		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)
+}
+
+// defaultBaseTransport returns the base HTTP transport. It uses 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, dialTLSContext func(context.Context, string, string) (net.Conn, error)) http.RoundTripper {
+	// 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 dialTLSContext != nil {
+		// If DialTLSContext is set, TLSClientConfig wil be ignored
+		trans.DialTLSContext = dialTLSContext
+	}
+
+	configureHTTP2(trans)
+
+	return trans
+}
+
+// configureHTTP2 configures the ReadIdleTimeout HTTP/2 option for the
+// transport. This allows broken idle connections to be pruned more quickly,
+// preventing the client from attempting to re-use connections that will no
+// longer work.
+func configureHTTP2(trans *http.Transport) {
+	http2Trans, err := http2.ConfigureTransports(trans)
+	if err == nil {
+		http2Trans.ReadIdleTimeout = time.Second * 31
+	}
+}
+
+// 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 addOpenTelemetryTransport(trans http.RoundTripper, settings *internal.DialSettings) http.RoundTripper {
+	if settings.TelemetryDisabled {
+		return trans
+	}
+	return otelhttp.NewTransport(trans)
+}
+
+// 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()
+}