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settings.go
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settings.go
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// Copyright 2017 Google LLC.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package internal supports the options and transport packages.
package internal
import (
"errors"
"net/http"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/grpc"
)
// DialSettings holds information needed to establish a connection with a
// Google API service.
type DialSettings struct {
Endpoint string
Scopes []string
TokenSource oauth2.TokenSource
Credentials *google.Credentials
CredentialsFile string // if set, Token Source is ignored.
CredentialsJSON []byte
UserAgent string
APIKey string
Audiences []string
HTTPClient *http.Client
GRPCDialOpts []grpc.DialOption
GRPCConn *grpc.ClientConn
GRPCConnPool int
NoAuth bool
TelemetryDisabled bool
// Google API system parameters. For more information please read:
// https://cloud.google.com/apis/docs/system-parameters
QuotaProject string
RequestReason string
}
// Validate reports an error if ds is invalid.
func (ds *DialSettings) Validate() error {
hasCreds := ds.APIKey != "" || ds.TokenSource != nil || ds.CredentialsFile != "" || ds.Credentials != nil
if ds.NoAuth && hasCreds {
return errors.New("options.WithoutAuthentication is incompatible with any option that provides credentials")
}
// Credentials should not appear with other options.
// We currently allow TokenSource and CredentialsFile to coexist.
// TODO(jba): make TokenSource & CredentialsFile an error (breaking change).
nCreds := 0
if ds.Credentials != nil {
nCreds++
}
if ds.CredentialsJSON != nil {
nCreds++
}
if ds.CredentialsFile != "" {
nCreds++
}
if ds.APIKey != "" {
nCreds++
}
if ds.TokenSource != nil {
nCreds++
}
if len(ds.Scopes) > 0 && len(ds.Audiences) > 0 {
return errors.New("WithScopes is incompatible with WithAudience")
}
// Accept only one form of credentials, except we allow TokenSource and CredentialsFile for backwards compatibility.
if nCreds > 1 && !(nCreds == 2 && ds.TokenSource != nil && ds.CredentialsFile != "") {
return errors.New("multiple credential options provided")
}
if ds.HTTPClient != nil && ds.GRPCConn != nil {
return errors.New("WithHTTPClient is incompatible with WithGRPCConn")
}
if ds.HTTPClient != nil && ds.GRPCDialOpts != nil {
return errors.New("WithHTTPClient is incompatible with gRPC dial options")
}
if ds.HTTPClient != nil && ds.QuotaProject != "" {
return errors.New("WithHTTPClient is incompatible with QuotaProject")
}
if ds.HTTPClient != nil && ds.RequestReason != "" {
return errors.New("WithHTTPClient is incompatible with RequestReason")
}
return nil
}