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
135
136
137
138
139
140
141
|
/******************************************************************************
*
* Copyright 2018 Stefan Majewsky <majewsky@gmx.net>
*
* 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 gopherschwift contains a Gophercloud backend for Schwift.
If your application uses Gophercloud (https://github.com/gophercloud/gophercloud),
you can use the Wrap() function in this package as an entrypoint to Schwift.
A schwift.Account created this way will re-use Gophercloud's authentication code,
so you only need to obtain a client token once using Gophercloud. For example:
import (
"github.com/gophercloud/gophercloud/openstack"
"github.com/gophercloud/utils/openstack/clientconfig"
"github.com/majewsky/schwift/gopherschwift"
)
provider, err := clientconfig.AuthenticatedClient(nil)
client, err := openstack.NewObjectStorageV1(provider, gophercloud.EndpointOpts{})
account, err := gopherschwift.Wrap(client)
Using this schwift.Account instance, you have access to all of schwift's API.
Refer to the documentation in the parent package for details.
*/
package gopherschwift
import (
"io"
"io/ioutil"
"net/http"
"github.com/gophercloud/gophercloud"
"github.com/majewsky/schwift"
)
// Options contains additional options that can be passed to Wrap().
type Options struct {
//If set, this User-Agent will be reported in HTTP requests instead of
//schwift.DefaultUserAgent.
UserAgent string
}
// Wrap creates a schwift.Account that uses the given service client as its
// backend. The service client must refer to a Swift endpoint, i.e. it should
// have been created by openstack.NewObjectStorageV1().
func Wrap(client *gophercloud.ServiceClient, opts *Options) (*schwift.Account, error) {
b := &backend{
c: client,
userAgent: schwift.DefaultUserAgent,
}
if opts != nil && opts.UserAgent != "" {
b.userAgent = opts.UserAgent
}
return schwift.InitializeAccount(b)
}
type backend struct {
c *gophercloud.ServiceClient
userAgent string
}
func (g *backend) EndpointURL() string {
return g.c.Endpoint
}
func (g *backend) Clone(newEndpointURL string) schwift.Backend {
clonedClient := *g.c
clonedClient.Endpoint = newEndpointURL
return &backend{
c: &clonedClient,
userAgent: g.userAgent,
}
}
func (g *backend) Do(req *http.Request) (*http.Response, error) {
return g.do(req, false)
}
func (g *backend) do(req *http.Request, afterReauth bool) (*http.Response, error) {
provider := g.c.ProviderClient
for key, value := range provider.AuthenticatedHeaders() {
req.Header.Set(key, value)
}
req.Header.Set("User-Agent", g.userAgent)
resp, err := provider.HTTPClient.Do(req)
if err != nil {
return nil, err
}
//detect expired token
if resp.StatusCode == http.StatusUnauthorized && !afterReauth {
_, err := io.Copy(ioutil.Discard, resp.Body)
if err != nil {
return nil, err
}
err = resp.Body.Close()
if err != nil {
return nil, err
}
err = provider.Reauthenticate(resp.Request.Header.Get("X-Auth-Token"))
if err != nil {
return nil, err
}
//Swift is stupid: Even though we send `Expect: 100-continue`, it doesn't
//help. Swift will right away answer `100 Continue` and ONLY THEN actually
//check the token (at least in our prod setup).
//
//To increase the chance that this does not completely break this request,
//reset the reader if it implements Seek().
if seekableReqBody, ok := req.Body.(io.Seeker); ok {
_, err := seekableReqBody.Seek(0, io.SeekStart)
if err != nil {
return nil, err
}
}
//restart request with new token
return g.do(req, true)
}
return resp, nil
}
|
