From 74252c7247c660914dffb325e392900d87bc7dd2 Mon Sep 17 00:00:00 2001
From: Neale Pickett <neale@woozle.org>
Date: Thu, 26 Feb 2015 05:49:21 +0000
Subject: [PATCH] Make g.cgi work for push too

---
 Makefile |  4 +--
 cgitrc   |  1 +
 g.cgi.c  | 24 ----------------
 g.cgi.go | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 87 insertions(+), 26 deletions(-)
 delete mode 100644 g.cgi.c
 create mode 100644 g.cgi.go

diff --git a/Makefile b/Makefile
index 2ac14e4..a6dfae7 100644
--- a/Makefile
+++ b/Makefile
@@ -48,8 +48,8 @@ $(DESTDIR)/geneweb.cgi: geneweb.c
 	$(CC) -o $@ $<
 	chmod +s $@
 
-$(DESTDIR)/g.cgi: g.cgi.c
-	$(CC) -o $@ $<
+$(DESTDIR)/g.cgi: g.cgi.go
+	go build -o $@ $<
 
 $(DESTDIR)/mp.cgi: minepig.cgi.go
 	go build -o $@ $<
diff --git a/cgitrc b/cgitrc
index 0082908..bf5b6d5 100644
--- a/cgitrc
+++ b/cgitrc
@@ -1,6 +1,7 @@
 strict-export=git-daemon-export-ok
 
 about-filter=/home/neale/public_html/about-filter.sh
+readme=:README.mdwn
 readme=:README
 section-from-path=1
 
diff --git a/g.cgi.c b/g.cgi.c
deleted file mode 100644
index 089964b..0000000
--- a/g.cgi.c
+++ /dev/null
@@ -1,24 +0,0 @@
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-#define GIT_PROJECT_ROOT "/home/neale/projects"
-#define CGIT_CONFIG "/home/neale/public_html/cgitrc"
-#define CGIT "/usr/lib/cgit/cgit.cgi"
-
-int
-main(int argc, char *argv[])
-{
-    char *uri = getenv("REQUEST_URI");
-
-    if (uri && strstr(uri, "git-upload-pack")) {
-        /* Use git-http-backend for great speed! */
-        setenv("GIT_PROJECT_ROOT", GIT_PROJECT_ROOT, 1);
-        execlp("git", "git", "http-backend", NULL);
-    } else {
-        setenv("CGIT_CONFIG", CGIT_CONFIG, 1);
-        execl(CGIT, "cgit", NULL);
-    }
-
-    return 0;
-}
diff --git a/g.cgi.go b/g.cgi.go
new file mode 100644
index 0000000..bbf671c
--- /dev/null
+++ b/g.cgi.go
@@ -0,0 +1,84 @@
+package main
+
+import (
+	"crypto/md5"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+const GitProjectRoot = "/home/neale/projects"
+const CgitConfig = "/home/neale/public_html/cgitrc"
+const Cgit = "/usr/lib/cgit/cgit.cgi"
+
+// printf "USER:PASS" | base64 | while read a; do printf "%s" "$a" | md5sum; done
+var allowed = []string{
+	"2c64993e88c06e297d4f01cf3b5aebdf", // neale
+}
+
+func execv(name string, arg ...string) {
+	c := exec.Command(name, arg...)
+	c.Stdin = os.Stdin
+	c.Stdout = os.Stdout
+	c.Stderr = os.Stderr
+	if err := c.Run(); err != nil {
+		log.Print(err)
+	}
+}
+
+func Authenticated() bool {
+	auth := os.Getenv("HTTP_AUTHORIZATION")
+	if auth == "" {
+		return false
+	}
+
+	parts := strings.Split(auth, " ")
+	switch {
+	case len(parts) != 2:
+		return false
+	case parts[0] != "Basic":
+		return false
+	}
+
+	hash := md5.Sum([]byte(parts[1]))
+	hashhex := fmt.Sprintf("%x", hash)
+
+	for _, a := range allowed {
+		if a == hashhex {
+			os.Setenv("AUTH_TYPE", parts[0])
+			os.Setenv("REMOTE_USER", "XXX-neale")
+			return true
+		}
+	}
+
+	return false
+}
+
+func main() {
+	log.SetFlags(0)
+	//log.SetOutput(os.Stdout)
+	//log.SetPrefix("Status: 500 CGI Go Boom\nContent-type: text/plain\n\nERROR: ")
+
+	os.Setenv("GIT_PROJECT_ROOT", GitProjectRoot)
+	os.Setenv("CGIT_CONFIG", CgitConfig)
+
+	uri := os.Getenv("REQUEST_URI")
+	switch {
+	case strings.HasSuffix(uri, "git-receive-pack"):
+		if Authenticated() {
+			execv("git", "http-backend")
+		} else {
+			fmt.Println("Status: 401 Not Authorized")
+			fmt.Println("Content-type: text/plain")
+			fmt.Println("WWW-Authenticate: Basic realm=\"git\"")
+			fmt.Println()
+			fmt.Println("Nope", os.Getenv("HTTP_AUTHORIZATION"))
+		}
+	case strings.HasSuffix(uri, "git-upload-pack"):
+		execv("git", "http-backend")
+	default:
+		execv(Cgit)
+	}
+}