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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, "<html><body>Link: <a href='%s'>%s</a></body></html>",
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))
}
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