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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
// Copyright 2015 Matthew Holt and The Caddy Authors
//
// 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 caddyconfig
import (
"bytes"
"encoding/json"
"fmt"
"io"
"mime"
"net/http"
"strings"
"sync"
"github.com/caddyserver/caddy/v2"
)
func init() {
caddy.RegisterModule(adminLoad{})
}
// adminLoad is a module that provides the /load endpoint
// for the Caddy admin API. The only reason it's not baked
// into the caddy package directly is because of the import
// of the caddyconfig package for its GetAdapter function.
// If the caddy package depends on the caddyconfig package,
// then the caddyconfig package will not be able to import
// the caddy package, and it can more easily cause backward
// edges in the dependency tree (i.e. import cycle).
// Fortunately, the admin API has first-class support for
// adding endpoints from modules.
type adminLoad struct{}
// CaddyModule returns the Caddy module information.
func (adminLoad) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "admin.api.load",
New: func() caddy.Module { return new(adminLoad) },
}
}
// Routes returns a route for the /load endpoint.
func (al adminLoad) Routes() []caddy.AdminRoute {
return []caddy.AdminRoute{
{
Pattern: "/load",
Handler: caddy.AdminHandlerFunc(al.handleLoad),
},
{
Pattern: "/adapt",
Handler: caddy.AdminHandlerFunc(al.handleAdapt),
},
}
}
// handleLoad replaces the entire current configuration with
// a new one provided in the response body. It supports config
// adapters through the use of the Content-Type header. A
// config that is identical to the currently-running config
// will be a no-op unless Cache-Control: must-revalidate is set.
func (adminLoad) handleLoad(w http.ResponseWriter, r *http.Request) error {
if r.Method != http.MethodPost {
return caddy.APIError{
HTTPStatus: http.StatusMethodNotAllowed,
Err: fmt.Errorf("method not allowed"),
}
}
buf := bufPool.Get().(*bytes.Buffer)
buf.Reset()
defer bufPool.Put(buf)
_, err := io.Copy(buf, r.Body)
if err != nil {
return caddy.APIError{
HTTPStatus: http.StatusBadRequest,
Err: fmt.Errorf("reading request body: %v", err),
}
}
body := buf.Bytes()
// if the config is formatted other than Caddy's native
// JSON, we need to adapt it before loading it
if ctHeader := r.Header.Get("Content-Type"); ctHeader != "" {
result, warnings, err := adaptByContentType(ctHeader, body)
if err != nil {
return caddy.APIError{
HTTPStatus: http.StatusBadRequest,
Err: err,
}
}
if len(warnings) > 0 {
respBody, err := json.Marshal(warnings)
if err != nil {
caddy.Log().Named("admin.api.load").Error(err.Error())
}
_, _ = w.Write(respBody)
}
body = result
}
forceReload := r.Header.Get("Cache-Control") == "must-revalidate"
err = caddy.Load(body, forceReload)
if err != nil {
return caddy.APIError{
HTTPStatus: http.StatusBadRequest,
Err: fmt.Errorf("loading config: %v", err),
}
}
caddy.Log().Named("admin.api").Info("load complete")
return nil
}
// handleAdapt adapts the given Caddy config to JSON and responds with the result.
func (adminLoad) handleAdapt(w http.ResponseWriter, r *http.Request) error {
if r.Method != http.MethodPost {
return caddy.APIError{
HTTPStatus: http.StatusMethodNotAllowed,
Err: fmt.Errorf("method not allowed"),
}
}
buf := bufPool.Get().(*bytes.Buffer)
buf.Reset()
defer bufPool.Put(buf)
_, err := io.Copy(buf, r.Body)
if err != nil {
return caddy.APIError{
HTTPStatus: http.StatusBadRequest,
Err: fmt.Errorf("reading request body: %v", err),
}
}
result, warnings, err := adaptByContentType(r.Header.Get("Content-Type"), buf.Bytes())
if err != nil {
return caddy.APIError{
HTTPStatus: http.StatusBadRequest,
Err: err,
}
}
out := struct {
Warnings []Warning `json:"warnings,omitempty"`
Result json.RawMessage `json:"result"`
}{
Warnings: warnings,
Result: result,
}
w.Header().Set("Content-Type", "application/json")
return json.NewEncoder(w).Encode(out)
}
// adaptByContentType adapts body to Caddy JSON using the adapter specified by contentType.
// If contentType is empty or ends with "/json", the input will be returned, as a no-op.
func adaptByContentType(contentType string, body []byte) ([]byte, []Warning, error) {
// assume JSON as the default
if contentType == "" {
return body, nil, nil
}
ct, _, err := mime.ParseMediaType(contentType)
if err != nil {
return nil, nil, caddy.APIError{
HTTPStatus: http.StatusBadRequest,
Err: fmt.Errorf("invalid Content-Type: %v", err),
}
}
// if already JSON, no need to adapt
if strings.HasSuffix(ct, "/json") {
return body, nil, nil
}
// adapter name should be suffix of MIME type
slashIdx := strings.Index(ct, "/")
if slashIdx < 0 {
return nil, nil, fmt.Errorf("malformed Content-Type")
}
adapterName := ct[slashIdx+1:]
cfgAdapter := GetAdapter(adapterName)
if cfgAdapter == nil {
return nil, nil, fmt.Errorf("unrecognized config adapter '%s'", adapterName)
}
result, warnings, err := cfgAdapter.Adapt(body, nil)
if err != nil {
return nil, nil, fmt.Errorf("adapting config using %s adapter: %v", adapterName, err)
}
return result, warnings, nil
}
var bufPool = sync.Pool{
New: func() any {
return new(bytes.Buffer)
},
}
|
