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bbgoget.go
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bbgoget.go
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package main
import (
"bufio"
"crypto/tls"
"flag"
"fmt"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"os"
"path"
"strings"
"time"
)
func main() {
fs := flag.NewFlagSet("bbgoget", flag.ExitOnError)
var (
listenAddr string
)
bbh := &BBHandler{}
fs.StringVar(&listenAddr, "listen-address", ":8800", "specify listen address")
fs.IntVar(&bbh.sshPort, "ssh-port", 7999, "specify git server ssh port")
fs.StringVar(&bbh.serverNameOverride, "servername-override", "", "override the server name. "+
"if not specified, uses the host value from the X-Forwarded-Host header")
fs.IntVar(&bbh.depth, "depth", 3, "specify depth of repositories")
fs.BoolVar(&bbh.rpMode, "reverse-proxy-mode", false, "if true, reverse proxy for reverse-proxy-url")
fs.StringVar(&bbh.rpURLString, "reverse-proxy-url", "", "if reverse-proxy-mode is true, this must be "+
"set to the upstream url for http(s) traffic")
fs.BoolVar(&bbh.rpIgnoreSSLErrors, "reverse-proxy-ignore-ssl-errors", false, "if true, ignore "+
"upstream tls errors in the case of a self signed certificate, for instance")
_ = fs.Parse(os.Args[1:])
err := bbh.Initialize()
if err != nil {
log.Printf("Error: %s", err)
os.Exit(1)
}
server := &http.Server{
Addr: listenAddr,
Handler: bbh,
ReadHeaderTimeout: 2 * time.Second,
WriteTimeout: 10 * time.Second,
}
err = server.ListenAndServe()
if err != nil {
log.Printf("Error: %s", err)
os.Exit(1)
}
}
type BBHandler struct {
serverNameOverride string
sshPort int
depth int
rpMode bool
rpURLString string
rpIgnoreSSLErrors bool
rpURL *url.URL
rp *httputil.ReverseProxy
}
func (bbh *BBHandler) Initialize() error {
if bbh.rpMode == true {
if bbh.rpURLString == "" {
return fmt.Errorf("if reverse proxy mode is enabled, the URL must be set")
}
var err error
bbh.rpURL, err = url.Parse(bbh.rpURLString)
if err != nil {
return fmt.Errorf("invalid reverse proxy URL: %w", err)
}
trans := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).DialContext,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: bbh.rpIgnoreSSLErrors,
},
ForceAttemptHTTP2: true,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
bbh.rp = &httputil.ReverseProxy{
Director: bbh.Director,
Transport: trans,
}
}
return nil
}
func (bbh *BBHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
if req.URL.Query().Get("go-get") != "1" {
// This is not a go-get request. Check to see if we're in proxy mode.
switch bbh.rpMode {
case false:
resp.WriteHeader(http.StatusBadRequest)
resp.Write([]byte("not a go-get request, investigate proxy config\n"))
case true:
// if we get here, we need to proxy the request
bbh.rp.ServeHTTP(resp, req)
}
return
}
pathParts := strings.Split(req.URL.Path, "/")
if len(pathParts) < bbh.depth {
resp.WriteHeader(http.StatusBadRequest)
resp.Write([]byte("invalid path\n"))
return
}
// Strip everything after the repository portion of the URL
prefix := strings.Join(pathParts[:bbh.depth], "/")
// Try to find the host
host := bbh.serverNameOverride
if len(host) == 0 {
host = req.Header.Get("X-Forwarded-Host")
if len(host) == 0 {
host, _ = splitHostPort(req.URL.Host)
}
}
if len(host) == 0 {
fmt.Printf("error with blank host")
resp.WriteHeader(http.StatusBadRequest)
resp.Write([]byte("blank host"))
}
hostSuffix := ""
if bbh.sshPort != 22 {
hostSuffix = fmt.Sprintf(":%d", bbh.sshPort)
}
repoURL := fmt.Sprintf("ssh://git@%s%s%s.git", host, hostSuffix, prefix)
importPrefix := host + prefix
resp.WriteHeader(http.StatusOK)
w := bufio.NewWriter(resp)
_, err := w.WriteString(fmt.Sprintf("<html><head><meta name=\"go-import\" content=\"%s %s %s\"></head><body>go get</body></html>", importPrefix, "git", repoURL))
if err != nil {
fmt.Printf("got error writing body: %s\n", err)
}
_ = w.Flush()
}
func (bbh BBHandler) Director(req *http.Request) {
req.URL.Host = bbh.rpURL.Host
req.URL.Scheme = bbh.rpURL.Scheme
if len(bbh.rpURL.Path) > 0 {
req.URL.Path = path.Join(bbh.rpURL.Path, req.URL.Path)
}
}
func splitHostPort(hp string) (host string, port string) {
vals := strings.Split(hp, ":")
if len(vals) == 1 {
return vals[0], ""
}
return vals[0], vals[1]
}