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
|
// Copyright 2016 The Hugo Authors. 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 data
import (
"bytes"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"path/filepath"
"time"
"github.com/gohugoio/hugo/cache/filecache"
"github.com/gohugoio/hugo/config"
"github.com/gohugoio/hugo/helpers"
"github.com/spf13/afero"
)
var (
resSleep = time.Second * 2 // if JSON decoding failed sleep for n seconds before retrying
resRetries = 1 // number of retries to load the JSON from URL
)
// getRemote loads the content of a remote file. This method is thread safe.
func (ns *Namespace) getRemote(cache *filecache.Cache, unmarshal func([]byte) (bool, error), req *http.Request) error {
url := req.URL.String()
if err := ns.deps.ExecHelper.Sec().CheckAllowedHTTPURL(url); err != nil {
return err
}
if err := ns.deps.ExecHelper.Sec().CheckAllowedHTTPMethod("GET"); err != nil {
return err
}
var headers bytes.Buffer
req.Header.Write(&headers)
id := helpers.MD5String(url + headers.String())
var handled bool
var retry bool
_, b, err := cache.GetOrCreateBytes(id, func() ([]byte, error) {
var err error
handled = true
for i := 0; i <= resRetries; i++ {
ns.deps.Log.Infof("Downloading: %s ...", url)
var res *http.Response
res, err = ns.client.Do(req)
if err != nil {
return nil, err
}
var b []byte
b, err = ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
res.Body.Close()
if isHTTPError(res) {
return nil, fmt.Errorf("Failed to retrieve remote file: %s, body: %q", http.StatusText(res.StatusCode), b)
}
retry, err = unmarshal(b)
if err == nil {
// Return it so it can be cached.
return b, nil
}
if !retry {
return nil, err
}
ns.deps.Log.Infof("Cannot read remote resource %s: %s", url, err)
ns.deps.Log.Infof("Retry #%d for %s and sleeping for %s", i+1, url, resSleep)
time.Sleep(resSleep)
}
return nil, err
})
if !handled {
// This is cached content and should be correct.
_, err = unmarshal(b)
}
return err
}
// getLocal loads the content of a local file
func getLocal(url string, fs afero.Fs, cfg config.Provider) ([]byte, error) {
filename := filepath.Join(cfg.GetString("workingDir"), url)
return afero.ReadFile(fs, filename)
}
// getResource loads the content of a local or remote file and returns its content and the
// cache ID used, if relevant.
func (ns *Namespace) getResource(cache *filecache.Cache, unmarshal func(b []byte) (bool, error), req *http.Request) error {
switch req.URL.Scheme {
case "":
url, err := url.QueryUnescape(req.URL.String())
if err != nil {
return err
}
b, err := getLocal(url, ns.deps.Fs.Source, ns.deps.Cfg)
if err != nil {
return err
}
_, err = unmarshal(b)
return err
default:
return ns.getRemote(cache, unmarshal, req)
}
}
func isHTTPError(res *http.Response) bool {
return res.StatusCode < 200 || res.StatusCode > 299
}
|
