services/arv-git-httpd/git_handler.go

   1 package main
   2
   3 import (
   4         "log"
   5         "net"
   6         "net/http"
   7         "net/http/cgi"
   8         "os"
   9 )
  10
  11 // gitHandler is an http.Handler that invokes git-http-backend (or
  12 // whatever backend is configured) via CGI, with appropriate
  13 // environment variables in place for git-http-backend or
  14 // gitolite-shell.
  15 type gitHandler struct {
  16         cgi.Handler
  17 }
  18
  19 func newGitHandler() http.Handler {
  20         const glBypass = "GL_BYPASS_ACCESS_CHECKS"
  21         const glHome = "GITOLITE_HTTP_HOME"
  22         var env []string
  23         path := os.Getenv("PATH")
  24         if theConfig.GitoliteHome != "" {
  25                 env = append(env,
  26                         glHome+"="+theConfig.GitoliteHome,
  27                         glBypass+"=1")
  28                 path = path + ":" + theConfig.GitoliteHome + "/bin"
  29         } else if home, bypass := os.Getenv(glHome), os.Getenv(glBypass); home != "" || bypass != "" {
  30                 env = append(env, glHome+"="+home, glBypass+"="+bypass)
  31                 log.Printf("DEPRECATED: Passing through %s and %s environment variables. Use GitoliteHome configuration instead.", glHome, glBypass)
  32         }
  33         env = append(env,
  34                 "GIT_PROJECT_ROOT="+theConfig.RepoRoot,
  35                 "GIT_HTTP_EXPORT_ALL=",
  36                 "SERVER_ADDR="+theConfig.Listen,
  37                 "PATH="+path)
  38         return &gitHandler{
  39                 Handler: cgi.Handler{
  40                         Path: theConfig.GitCommand,
  41                         Dir:  theConfig.RepoRoot,
  42                         Env:  env,
  43                         Args: []string{"http-backend"},
  44                 },
  45         }
  46 }
  47
  48 func (h *gitHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
  49         remoteHost, remotePort, err := net.SplitHostPort(r.RemoteAddr)
  50         if err != nil {
  51                 log.Printf("Internal error: SplitHostPort(r.RemoteAddr==%q): %s", r.RemoteAddr, err)
  52                 w.WriteHeader(http.StatusInternalServerError)
  53                 return
  54         }
  55
  56         // Copy the wrapped cgi.Handler, so these request-specific
  57         // variables don't leak into the next request.
  58         handlerCopy := h.Handler
  59         handlerCopy.Env = append(handlerCopy.Env,
  60                 // In Go1.5 we can skip this, net/http/cgi will do it for us:
  61                 "REMOTE_HOST="+remoteHost,
  62                 "REMOTE_ADDR="+remoteHost,
  63                 "REMOTE_PORT="+remotePort,
  64                 // Ideally this would be a real username:
  65                 "REMOTE_USER="+r.RemoteAddr,
  66         )
  67         handlerCopy.ServeHTTP(w, r)
  68 }