1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 transport supports network connections to HTTP and GRPC servers.
// This package is not intended for use by end developers. Use the
// google.golang.org/api/option package to configure API clients.
package transport
import (
"errors"
"fmt"
"io/ioutil"
"net/http"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/oauth"
gtransport "google.golang.org/api/googleapi/transport"
"google.golang.org/api/internal"
"google.golang.org/api/option"
)
// NewHTTPClient 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 NewHTTPClient(ctx context.Context, opts ...option.ClientOption) (*http.Client, string, error) {
var o internal.DialSettings
for _, opt := range opts {
opt.Apply(&o)
}
if o.GRPCConn != nil {
return nil, "", errors.New("unsupported gRPC connection specified")
}
// TODO(djd): Set UserAgent on all outgoing requests.
if o.HTTPClient != nil {
return o.HTTPClient, o.Endpoint, nil
}
if o.APIKey != "" {
hc := &http.Client{
Transport: >ransport.APIKey{
Key: o.APIKey,
Transport: http.DefaultTransport,
},
}
return hc, o.Endpoint, nil
}
if o.ServiceAccountJSONFilename != "" {
ts, err := serviceAcctTokenSource(ctx, o.ServiceAccountJSONFilename, o.Scopes...)
if err != nil {
return nil, "", err
}
o.TokenSource = ts
}
if o.TokenSource == nil {
var err error
o.TokenSource, err = google.DefaultTokenSource(ctx, o.Scopes...)
if err != nil {
return nil, "", fmt.Errorf("google.DefaultTokenSource: %v", err)
}
}
return oauth2.NewClient(ctx, o.TokenSource), o.Endpoint, nil
}
// Set at init time by dial_appengine.go. If nil, we're not on App Engine.
var appengineDialerHook func(context.Context) grpc.DialOption
// DialGRPC returns a GRPC connection for use communicating with a Google cloud
// service, configured with the given ClientOptions.
func DialGRPC(ctx context.Context, opts ...option.ClientOption) (*grpc.ClientConn, error) {
var o internal.DialSettings
for _, opt := range opts {
opt.Apply(&o)
}
if o.HTTPClient != nil {
return nil, errors.New("unsupported HTTP client specified")
}
if o.GRPCConn != nil {
return o.GRPCConn, nil
}
if o.ServiceAccountJSONFilename != "" {
ts, err := serviceAcctTokenSource(ctx, o.ServiceAccountJSONFilename, o.Scopes...)
if err != nil {
return nil, err
}
o.TokenSource = ts
}
if o.TokenSource == nil {
var err error
o.TokenSource, err = google.DefaultTokenSource(ctx, o.Scopes...)
if err != nil {
return nil, fmt.Errorf("google.DefaultTokenSource: %v", err)
}
}
grpcOpts := []grpc.DialOption{
grpc.WithPerRPCCredentials(oauth.TokenSource{o.TokenSource}),
grpc.WithTransportCredentials(credentials.NewClientTLSFromCert(nil, "")),
}
if appengineDialerHook != nil {
// Use the Socket API on App Engine.
grpcOpts = append(grpcOpts, appengineDialerHook(ctx))
}
grpcOpts = append(grpcOpts, o.GRPCDialOpts...)
if o.UserAgent != "" {
grpcOpts = append(grpcOpts, grpc.WithUserAgent(o.UserAgent))
}
return grpc.DialContext(ctx, o.Endpoint, grpcOpts...)
}
func serviceAcctTokenSource(ctx context.Context, filename string, scope ...string) (oauth2.TokenSource, error) {
data, err := ioutil.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("cannot read service account file: %v", err)
}
cfg, err := google.JWTConfigFromJSON(data, scope...)
if err != nil {
return nil, fmt.Errorf("google.JWTConfigFromJSON: %v", err)
}
return cfg.TokenSource(ctx), nil
}
|
