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// Copyright 2017 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// 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.DefaultCredentials
CredentialsFile string // if set, Token Source is ignored.
CredentialsJSON []byte
UserAgent string
APIKey string
HTTPClient *http.Client
GRPCDialOpts []grpc.DialOption
GRPCConn *grpc.ClientConn
NoAuth bool
}
// 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++
}
// 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")
}
return nil
}
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