2019-03-30 02:40:11 +00:00
|
|
|
/*
|
|
|
|
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 (
|
|
|
|
"flag"
|
|
|
|
"fmt"
|
|
|
|
"log"
|
|
|
|
"net/http"
|
|
|
|
"os"
|
|
|
|
"regexp"
|
|
|
|
)
|
|
|
|
|
|
|
|
var redirects = map[string]string{
|
|
|
|
"/change": "https://gvisor.googlesource.com/gvisor/",
|
|
|
|
"/cl": "https://gvisor-review.googlesource.com/",
|
|
|
|
"/issue": "https://github.com/google/gvisor/issues",
|
|
|
|
"/issue/new": "https://github.com/google/gvisor/issues/new",
|
2019-04-03 05:48:18 +00:00
|
|
|
|
|
|
|
// Redirects to compatibility docs.
|
|
|
|
"/c": "/docs/user_guide/compatibility",
|
|
|
|
"/c/linux/amd64": "/docs/user_guide/compatibility/amd64",
|
2019-03-30 02:40:11 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
var prefixHelpers = map[string]string{
|
2019-04-01 23:54:43 +00:00
|
|
|
"cl": "https://gvisor-review.googlesource.com/c/gvisor/+/%s",
|
|
|
|
"change": "https://gvisor.googlesource.com/gvisor/+/%s",
|
|
|
|
"issue": "https://github.com/google/gvisor/issues/%s",
|
2019-04-03 05:48:18 +00:00
|
|
|
|
|
|
|
// Redirects to compatibility docs.
|
|
|
|
"c/linux/amd64": "/docs/user_guide/compatibility/amd64/#%s",
|
2019-03-30 02:40:11 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
var validId = regexp.MustCompile(`^[A-Za-z0-9-]*/?$`)
|
|
|
|
|
2019-04-03 05:48:18 +00:00
|
|
|
// redirectWithQuery redirects to the given target url preserving query parameters.
|
2019-03-30 02:40:11 +00:00
|
|
|
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)
|
|
|
|
}
|
|
|
|
|
|
|
|
// 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 {
|
2019-04-03 05:48:18 +00:00
|
|
|
// Redirect /prefix/ to /prefix.
|
2019-03-30 02:40:11 +00:00
|
|
|
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, prefixRedirectHandler(p, baseURL))
|
|
|
|
}
|
|
|
|
|
|
|
|
for path, redirect := range redirects {
|
|
|
|
mux.Handle(path, redirectHandler(redirect))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// registerStatic registers static file handlers
|
|
|
|
func registerStatic(mux *http.ServeMux, staticDir string) {
|
|
|
|
if mux == nil {
|
|
|
|
mux = http.DefaultServeMux
|
|
|
|
}
|
|
|
|
mux.Handle("/", http.FileServer(http.Dir(staticDir)))
|
|
|
|
}
|
|
|
|
|
|
|
|
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")
|
|
|
|
)
|
|
|
|
|
|
|
|
func main() {
|
|
|
|
flag.Parse()
|
|
|
|
|
|
|
|
registerRedirects(nil)
|
|
|
|
registerStatic(nil, *staticDir)
|
|
|
|
|
|
|
|
log.Fatal(http.ListenAndServe(*addr, nil))
|
|
|
|
}
|