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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
// Copyright 2019 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
//
// https://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 main
import (
"context"
"flag"
"fmt"
"log"
"net/http"
"os"
"regexp"
"strings"
// For triggering manual rebuilds.
"golang.org/x/oauth2/google"
"google.golang.org/api/cloudbuild/v1"
)
var redirects = map[string]string{
"/change": "https://github.com/google/gvisor",
"/issue": "https://github.com/google/gvisor/issues",
"/issue/new": "https://github.com/google/gvisor/issues/new",
"/pr": "https://github.com/google/gvisor/pulls",
// Redirects to compatibility docs.
"/c": "/docs/user_guide/compatibility/",
"/c/linux/amd64": "/docs/user_guide/compatibility/linux/amd64/",
// Redirect for old urls
"/docs/user_guide/compatibility/amd64/": "/docs/user_guide/compatibility/linux/amd64/",
"/docs/user_guide/compatibility/amd64": "/docs/user_guide/compatibility/linux/amd64/",
"/docs/user_guide/kubernetes/": "/docs/user_guide/quick_start/kubernetes/",
"/docs/user_guide/kubernetes": "/docs/user_guide/quick_start/kubernetes/",
"/docs/user_guide/oci/": "/docs/user_guide/quick_start/oci/",
"/docs/user_guide/oci": "/docs/user_guide/quick_start/oci/",
"/docs/user_guide/docker/": "/docs/user_guide/quick_start/docker/",
"/docs/user_guide/docker": "/docs/user_guide/quick_start/docker/",
// Deprecated, but links continue to work.
"/cl": "https://gvisor-review.googlesource.com",
}
var prefixHelpers = map[string]string{
"change": "https://github.com/google/gvisor/commit/%s",
"issue": "https://github.com/google/gvisor/issues/%s",
"pr": "https://github.com/google/gvisor/pull/%s",
// Redirects to compatibility docs.
"c/linux/amd64": "/docs/user_guide/compatibility/linux/amd64/#%s",
// Deprecated, but links continue to work.
"cl": "https://gvisor-review.googlesource.com/c/gvisor/+/%s",
}
var (
validId = regexp.MustCompile(`^[A-Za-z0-9-]*/?$`)
goGetHeader = `<meta name="go-import" content="gvisor.dev/gvisor git https://github.com/google/gvisor">`
goGetHTML5 = `<!doctype html><html><head><meta charset=utf-8>` + goGetHeader + `<title>Go-get</title></head><body></html>`
)
// cronHandler wraps an http.Handler to check that the request is from the App
// Engine Cron service.
// See: https://cloud.google.com/appengine/docs/standard/go112/scheduling-jobs-with-cron-yaml#validating_cron_requests
func cronHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Header.Get("X-Appengine-Cron") != "true" {
http.NotFound(w, r)
return
}
// Fallthrough.
h.ServeHTTP(w, r)
})
}
// wrappedHandler wraps an http.Handler.
//
// If the query parameters include go-get=1, then we redirect to a single
// static page that allows us to serve arbitrary Go packages.
func wrappedHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
gg, ok := r.URL.Query()["go-get"]
if ok && len(gg) == 1 && gg[0] == "1" {
// Serve a trivial html page.
w.Write([]byte(goGetHTML5))
return
}
// Fallthrough.
h.ServeHTTP(w, r)
})
}
// redirectWithQuery redirects to the given target url preserving query parameters.
func redirectWithQuery(w http.ResponseWriter, r *http.Request, target string) {
url := target
if qs := r.URL.RawQuery; qs != "" {
url += "?" + qs
}
http.Redirect(w, r, url, http.StatusFound)
}
// hostRedirectHandler redirects the www. domain to the naked domain.
func hostRedirectHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if strings.HasPrefix(r.Host, "www.") {
// Redirect to the naked domain.
r.URL.Scheme = "https" // Assume https.
r.URL.Host = r.Host[4:] // Remove the 'www.'
http.Redirect(w, r, r.URL.String(), http.StatusMovedPermanently)
return
}
if *projectId != "" && r.Host == *projectId+".appspot.com" && *customHost != "" {
// Redirect to the custom domain.
r.URL.Scheme = "https" // Assume https.
r.URL.Host = *customHost
http.Redirect(w, r, r.URL.String(), http.StatusMovedPermanently)
return
}
h.ServeHTTP(w, r)
})
}
// prefixRedirectHandler returns a handler that redirects to the given formated url.
func prefixRedirectHandler(prefix, baseURL string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if p := r.URL.Path; p == prefix {
// Redirect /prefix/ to /prefix.
http.Redirect(w, r, p[:len(p)-1], http.StatusFound)
return
}
id := r.URL.Path[len(prefix):]
if !validId.MatchString(id) {
http.Error(w, "Not found", http.StatusNotFound)
return
}
target := fmt.Sprintf(baseURL, id)
redirectWithQuery(w, r, target)
})
}
// redirectHandler returns a handler that redirects to the given url.
func redirectHandler(target string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
redirectWithQuery(w, r, target)
})
}
// redirectRedirects registers redirect http handlers.
func registerRedirects(mux *http.ServeMux) {
if mux == nil {
mux = http.DefaultServeMux
}
for prefix, baseURL := range prefixHelpers {
p := "/" + prefix + "/"
mux.Handle(p, hostRedirectHandler(wrappedHandler(prefixRedirectHandler(p, baseURL))))
}
for path, redirect := range redirects {
mux.Handle(path, hostRedirectHandler(wrappedHandler(redirectHandler(redirect))))
}
}
// registerStatic registers static file handlers
func registerStatic(mux *http.ServeMux, staticDir string) {
if mux == nil {
mux = http.DefaultServeMux
}
mux.Handle("/", hostRedirectHandler(wrappedHandler(http.FileServer(http.Dir(staticDir)))))
}
// registerRebuild registers the rebuild handler.
func registerRebuild(mux *http.ServeMux) {
if mux == nil {
mux = http.DefaultServeMux
}
mux.Handle("/rebuild", cronHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := context.Background()
credentials, err := google.FindDefaultCredentials(ctx, cloudbuild.CloudPlatformScope)
if err != nil {
http.Error(w, "credentials error: "+err.Error(), 500)
return
}
cloudbuildService, err := cloudbuild.NewService(ctx)
if err != nil {
http.Error(w, "cloudbuild service error: "+err.Error(), 500)
return
}
projectID := credentials.ProjectID
if projectID == "" {
// If running locally, then this project will not be
// available. Use the default project here.
projectID = "gvisor-website"
}
triggers, err := cloudbuildService.Projects.Triggers.List(projectID).Do()
if err != nil {
http.Error(w, "trigger list error: "+err.Error(), 500)
return
}
if len(triggers.Triggers) < 1 {
http.Error(w, "trigger list error: no triggers", 500)
return
}
if _, err := cloudbuildService.Projects.Triggers.Run(
projectID,
triggers.Triggers[0].Id,
&cloudbuild.RepoSource{
// In the current project, require that a
// github cloud source repository exists with
// the given name, and build from master.
BranchName: "master",
RepoName: "github_google_gvisor-website",
ProjectId: projectID,
}).Do(); err != nil {
http.Error(w, "run error: "+err.Error(), 500)
return
}
})))
}
func envFlagString(name, def string) string {
if val := os.Getenv(name); val != "" {
return val
}
return def
}
var (
addr = flag.String("http", envFlagString("HTTP", ":8080"), "HTTP service address")
staticDir = flag.String("static-dir", envFlagString("STATIC_DIR", "static"), "static files directory")
// Uses the standard GOOGLE_CLOUD_PROJECT environment variable set by App Engine.
projectId = flag.String("project-id", envFlagString("GOOGLE_CLOUD_PROJECT", ""), "The App Engine project ID.")
customHost = flag.String("custom-domain", envFlagString("CUSTOM_DOMAIN", "gvisor.dev"), "The application's custom domain.")
)
func main() {
flag.Parse()
registerRedirects(nil)
registerRebuild(nil)
registerStatic(nil, *staticDir)
log.Printf("Listening on %s...", *addr)
log.Fatal(http.ListenAndServe(*addr, nil))
}
|
