package main import ( "crypto/sha256" "fmt" "io/ioutil" "log" "net/http" "os" "path/filepath" "time" "io" ) var p_conf = Config{ host: "localhost", port: "8000", paste_dir: "./pastes", templ_dir: "./tmpl", log_fname: "./binit.log", max_size: 4096, } func min (a, b int) int { if a > b { return b } else { return a } } func handle_get_paste(w http.ResponseWriter, r *http.Request) { var paste_name, orig_name string var err error orig_name = filepath.Clean(r.URL.Path) paste_name = p_conf.paste_dir + "/" + orig_name orig_IP := r.RemoteAddr log.Printf("Received GET from %s for '%s'\n", orig_IP, orig_name) // The default is to serve index.html if (orig_name == "/") || (orig_name == "/index.html") { http.ServeFile(w, r, p_conf.templ_dir + "/index.html") } else { // otherwise, if the requested paste exists, we serve it... if _, err = os.Stat(paste_name); err == nil && orig_name != "./" { http.ServeFile(w, r, paste_name) } else { // otherwise, we give say we didn't find it fmt.Fprintf(w, "Paste '%s' not found\n", orig_name) return } } } func handle_put_paste(w http.ResponseWriter, r *http.Request) { if err := r.ParseForm(); err != nil { // Invalid POST -- let's serve the default file http.ServeFile(w, r, p_conf.templ_dir + "/index.html") } else { h := sha256.New() req_body := r.PostForm orig_IP := r.RemoteAddr log.Printf("Received new POST from %s\n", orig_IP) // get title, body, and time title := req_body.Get("title") paste := req_body.Get("paste") now := time.Now().String() // format content paste = paste[0:min(len(paste), int(p_conf.max_size))] content := fmt.Sprintf("# Title: %s\n# Pasted: %s\n------------\n%s", title, now, paste) // ccompute the sha256 hash using title, body, and time h.Write([]byte(content)) paste_hash := fmt.Sprintf("%x", h.Sum(nil)) log.Printf(" `-- hash: %s\n", paste_hash) paste_dir := p_conf.paste_dir + "/" // Now we save the file for i := 0; i < len(paste_hash)-16; i++ { paste_name := paste_hash[i:i+16] if _, err := os.Stat(paste_dir + paste_name); os.IsNotExist(err) { // The file does not exist, so we can create it if err := ioutil.WriteFile(paste_dir+ paste_name, []byte(content), 0644); err == nil { // and then we return the URL: log.Printf(" `-- saving paste to : %s", paste_dir + paste_name) hostname := r.Host if show := req_body.Get("show"); show != "" { fmt.Fprintf(w, "%s/%s", hostname, paste_name) return } else{ fmt.Fprintf(w, "Link: %s", paste_hash[i:i+16], paste_hash[i:i+16]) return } } else { fmt.Fprintf(w, "Cannot create the paste.. Sorry!\n") return } } } } } func req_handler(w http.ResponseWriter, r *http.Request) { switch r.Method { case "GET": handle_get_paste(w, r) case "POST": handle_put_paste(w, r) default: http.NotFound(w, r) } } func main() { parse_config("binit.cfg", &p_conf) f, err := os.OpenFile(p_conf.log_fname, os.O_APPEND | os.O_CREATE | os.O_RDWR, 0600) if err != nil { fmt.Fprintf(os.Stderr, "Error opening logfile: %s. Exiting\n", p_conf.log_fname) os.Exit(1) } log.SetOutput(io.Writer(f)) log.SetPrefix("[binit]: ") log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds) log.Println("Binit version 0.1 -- Starting ") log.Printf(" + listening on: %s:%s\n", p_conf.host, p_conf.port ) log.Printf(" + paste_dir: %s\n", p_conf.paste_dir) log.Printf(" + templ_dir: %s\n", p_conf.templ_dir) log.Printf(" + max_size: %d\n", p_conf.max_size) http.HandleFunc("/", req_handler) log.Fatal(http.ListenAndServe(p_conf.host + ":" + p_conf.port, nil)) }