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tailscale-s3-proxy.go
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tailscale-s3-proxy.go
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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
// tailscale-reverse-proxy is a tailscale node creator that reverse proxies
// HTTP services.
//
// Set the TS_AUTHKEY environment variable to have this server automatically
// join your tailnet, or look for the logged auth link on first start.
package main
import (
"context"
"crypto/tls"
"flag"
"fmt"
"log"
"net"
"net/http"
"os"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/jszwec/s3fs"
"tailscale.com/tsnet"
)
var (
hostname = flag.String("hostname", "", "Tailscale hostname to serve on, used as the base name for MagicDNS or subdomain in your domain alias for HTTPS.")
bucket = flag.String("bucket", "", "The S3 bucket to serve from. See -key-prefix if you need to serve part of it.")
keyPrefix = flag.String("key-prefix", "", "Prefix for the keys in the bucket to serve")
tailscaleDir = flag.String("state-dir", "./", "Alternate directory to use for Tailscale state storage. If empty, a default is used.")
useHTTPS = flag.Bool("use-https", false, "Serve over HTTPS via your *.ts.net subdomain if enabled in Tailscale admin.")
debug = flag.Bool("debug", false, "Print out HTTP requests as they come in")
)
func main() {
// used a lot
var err error
flag.Parse()
if *hostname == "" || strings.Contains(*hostname, ".") {
log.Fatal("missing or invalid -hostname")
}
if *bucket == "" {
log.Fatal("missing -bucket")
}
ts := &tsnet.Server{
Dir: *tailscaleDir,
Hostname: *hostname,
}
if err := ts.Start(); err != nil {
log.Fatalf("Error starting tsnet.Server: %v", err)
}
localClient, _ := ts.LocalClient()
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if *keyPrefix != "" {
r.URL.Path = singleJoiningSlash(*keyPrefix, r.URL.Path)
}
r.URL.Path = strings.TrimPrefix(r.URL.Path, "/")
http.FileServer(http.FS(getS3fs(*bucket))).ServeHTTP(w, r)
})
var ln net.Listener
if *useHTTPS {
ln, err = ts.Listen("tcp", ":443")
if err != nil {
log.Fatal(err)
}
ln = tls.NewListener(ln, &tls.Config{
GetCertificate: localClient.GetCertificate,
})
go func() {
// wait for tailscale to start before trying to fetch cert names
for i := 0; i < 60; i++ {
st, err := localClient.Status(context.Background())
if err != nil {
log.Printf("error retrieving tailscale status; retrying: %v", err)
} else {
log.Printf("tailscale status: %v", st.BackendState)
if st.BackendState == "Running" {
break
}
}
time.Sleep(time.Second)
}
l80, err := ts.Listen("tcp", ":80")
if err != nil {
log.Fatal(err)
}
name, ok := localClient.ExpandSNIName(context.Background(), *hostname)
if !ok {
log.Fatalf("can't get hostname for https redirect")
}
if err := http.Serve(l80, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, fmt.Sprintf("https://%s", name), http.StatusMovedPermanently)
})); err != nil {
log.Fatal(err)
}
}()
} else {
ln, err = ts.Listen("tcp", ":80")
}
if err != nil {
log.Fatal(err)
}
log.Printf("tailscale-s3-proxy running at %v, proxying to %v", ln.Addr(), *bucket)
log.Fatal(http.Serve(ln, handler))
}
func getS3fs(bucket string) *s3fs.S3FS {
region, exists := os.LookupEnv("AWS_REGION")
if !exists {
region = "us-west-2"
}
s := session.Must(session.NewSession(&aws.Config{Region: ®ion}))
svc := s3.New(s)
return s3fs.New(svc, bucket)
}
func printRequest(req *http.Request) {
log.Printf("%s %s %s", req.Method, req.RemoteAddr, req.RequestURI)
}
func singleJoiningSlash(a, b string) string {
aslash := strings.HasSuffix(a, "/")
bslash := strings.HasPrefix(b, "/")
switch {
case aslash && bslash:
return a + b[1:]
case !aslash && !bslash:
return a + "/" + b
}
return a + b
}