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package main
import (
"compress/gzip"
"context"
"fmt"
"io"
"net/http"
"os"
"os/exec"
"strings"
"time"
)
func isSmart(r *http.Request, rest string) bool {
switch rest {
case "info/refs":
return r.URL.Query().Get("service") != ""
case "git-upload-pack", "git-receive-pack":
return r.Method == "POST"
}
return false
}
func (s *Server) basicUser(r *http.Request) (User, bool) {
name, secret, ok := r.BasicAuth()
if !ok {
return User{}, false
}
if u, ok := s.store.UserByToken(name, secret); ok {
return u, true
}
return s.store.CheckPassword(name, secret)
}
func (s *Server) smart(w http.ResponseWriter, r *http.Request, owner User, name, rest string) {
repo, err := s.store.RepoByPath(owner.Name, name)
if err != nil {
var viewer *User
if u, ok := s.basicUser(r); ok {
viewer = &u
}
segment, _, _ := strings.Cut(strings.TrimPrefix(r.URL.Path, "/~"+owner.Name+"/"), "/")
if !s.redirectMoved(w, r, owner.Name, segment, viewer, http.StatusPermanentRedirect) {
http.Error(w, "repository not found", 404)
}
return
}
service := r.URL.Query().Get("service")
if rest != "info/refs" {
service = rest
}
if service != "git-upload-pack" && service != "git-receive-pack" {
http.Error(w, "unsupported service", 403)
return
}
needAuth := service == "git-receive-pack" || repo.Private
if needAuth {
ip := clientIP(r)
if s.limiter.blocked(ip) {
http.Error(w, "too many failed attempts", 429)
return
}
u, ok := s.basicUser(r)
if !ok || !s.store.CanWrite(repo, &u) {
if _, _, given := r.BasicAuth(); given {
s.limiter.fail(ip)
}
w.Header().Set("WWW-Authenticate", `Basic realm="`+s.host+`"`)
http.Error(w, "authentication required", 401)
return
}
}
if service == "git-receive-pack" && repo.Archived {
http.Error(w, "repository is archived and read only", 403)
return
}
if service == "git-receive-pack" {
if over, used, quota := overQuota(s.root, repo.Owner.Name); over {
http.Error(w, quotaMessage(used, quota), 403)
return
}
}
dir := s.repoDir(repo)
w.Header().Set("Cache-Control", "no-cache")
ctx, cancel := context.WithTimeout(r.Context(), 10*time.Minute)
defer cancel()
if rest == "info/refs" {
cmd := exec.CommandContext(ctx, "git", strings.TrimPrefix(service, "git-"), "--stateless-rpc", "--advertise-refs", dir)
out, err := cmd.Output()
if err != nil {
http.Error(w, "git failed", 500)
return
}
w.Header().Set("Content-Type", "application/x-"+service+"-advertisement")
fmt.Fprintf(w, "%04x# service=%s\n0000", len(service)+15, service)
w.Write(out)
return
}
var body io.Reader = r.Body
if r.Header.Get("Content-Encoding") == "gzip" {
gz, err := gzip.NewReader(r.Body)
if err != nil {
http.Error(w, "bad gzip", 400)
return
}
defer gz.Close()
body = gz
}
argv := []string{strings.TrimPrefix(service, "git-"), "--stateless-rpc", dir}
if service == "git-receive-pack" {
argv = append(pushLimit(s.root, repo.Owner.Name), argv...)
if over, used, quota := overQuota(s.root, repo.Owner.Name); quota > 0 && !over {
body = io.LimitReader(body, quota-used+1<<20)
}
}
cmd := exec.CommandContext(ctx, "git", argv...)
cmd.Stdin = body
cmd.Env = []string{"GIT_PROTOCOL=" + r.Header.Get("Git-Protocol"), "HOME=/nonexistent", "PATH=" + os.Getenv("PATH")}
stdout, err := cmd.StdoutPipe()
if err != nil {
http.Error(w, "git failed", 500)
return
}
if err := cmd.Start(); err != nil {
http.Error(w, "git failed", 500)
return
}
w.Header().Set("Content-Type", "application/x-"+service+"-result")
w.WriteHeader(200)
flusher, _ := w.(http.Flusher)
buf := make([]byte, 32*1024)
for {
n, err := stdout.Read(buf)
if n > 0 {
w.Write(buf[:n])
if flusher != nil {
flusher.Flush()
}
}
if err != nil {
break
}
}
cmd.Wait()
}
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