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package main
import (
"compress/gzip"
"crypto/rand"
_ "embed"
"encoding/base64"
"encoding/gob"
"errors"
"flag"
"html/template"
"log"
"net/http"
"os"
"time"
"github.com/gorilla/mux"
)
var logger = log.New(os.Stderr, "", 0)
// const ID_BYTES = 5
const ID_BYTES = 16
//go:embed index.tpl
var indexTemplateContent string
var indexTemplate = template.Must(template.New("index").Parse(indexTemplateContent))
//go:embed view.tpl
var viewTemplateContent string
var viewTemplate = template.Must(template.New("view").Parse(viewTemplateContent))
//go:embed error.tpl
var errorTemplateContent string
var errorTemplate = template.Must(template.New("error").Parse(errorTemplateContent))
//go:embed style.css
var stylesheetContent []byte
type Paste struct {
Id string
Title string
Content []byte
}
func (p Paste) GetContent() string {
return string(p.Content)
}
func (p *Paste) Load() error {
fh, err := os.Open(p.Id)
if err != nil {
return err
}
zrdr, err := gzip.NewReader(fh)
if err != nil {
return err
}
dec := gob.NewDecoder(zrdr)
err = dec.Decode(&p)
if err != nil {
return err
}
zrdr.Close()
return fh.Close()
}
func (p Paste) Save() error {
fh, err := os.OpenFile(p.Id, os.O_CREATE|os.O_RDWR, 0666)
if err != nil {
return err
}
zwr := gzip.NewWriter(fh)
enc := gob.NewEncoder(zwr)
err = enc.Encode(&p)
if err != nil {
return err
}
zwr.Close()
return fh.Close()
}
func GenId() string {
r := make([]byte, ID_BYTES)
_, err := rand.Read(r)
if err != nil {
logger.Fatal(err)
}
return base64.RawURLEncoding.EncodeToString(r)
}
func main() {
fl := flag.NewFlagSet("Brutally simple pastebin", flag.ExitOnError)
listen := fl.String("listen", ":6130", "Address to bind to, LISTEN_ADDR environment variable overrides")
debug := fl.Bool("d", false, "debugging add information to the logging output DEBUG=true|false controls this as well")
storage := fl.String("s", "", "Directory to serve, must be supplied via flag or STORAGE_DIR environment variable")
_ = fl.Parse(os.Args[1:])
if addr := os.Getenv("LISTEN_ADDR"); addr != "" {
*listen = addr
}
if d := os.Getenv("DEBUG"); d == "true" || *debug {
logger.SetFlags(log.LstdFlags | log.Llongfile)
}
if d := os.Getenv("STORAGE_DIR"); d != "" {
*storage = d
}
if *storage == "" {
logger.Fatal("Cannot continue without storage directory, set `-s` flag or STORAGE_DIR environment variable")
}
err := os.Chdir(*storage)
if err != nil {
logger.Fatal(err)
}
mux := mux.NewRouter()
mux.HandleFunc("/new", newPaste)
mux.HandleFunc("/view/{id}", loadPaste)
mux.HandleFunc("/style.css", stylesheet)
mux.HandleFunc("/", index)
logger.Println("listening on: ", *listen)
srv := &http.Server{
Handler: mux,
Addr: *listen,
WriteTimeout: 15 * time.Second,
ReadTimeout: 15 * time.Second,
}
logger.Fatal(srv.ListenAndServe())
}
func newPaste(w http.ResponseWriter, r *http.Request) {
err := r.ParseForm()
if err != nil {
logger.Println(err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
title := r.FormValue("title")
content := r.FormValue("content")
if title == "" || content == "" {
logger.Println("Empty title or content")
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
p := &Paste{
Id: GenId(),
Title: title,
Content: []byte(content),
}
err = p.Save()
if err != nil {
logger.Println(err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/view/"+p.Id, http.StatusFound)
}
func loadPaste(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
id, ok := vars["id"]
if !ok {
w.WriteHeader(http.StatusBadRequest)
err := errorTemplate.Execute(w, map[string]string{
"Short": "ID Not found",
"Long": "There was no ID supplied",
})
if err != nil {
logger.Println(err)
}
return
}
p := &Paste{Id: id}
err := p.Load()
if err != nil {
logger.Println(err)
if errors.Is(err, os.ErrNotExist) {
w.WriteHeader(http.StatusNotFound)
err = errorTemplate.Execute(w, map[string]string{
"Short": "ID Not found",
"Long": "ID: " + p.Id + "Was not found",
})
} else {
w.WriteHeader(http.StatusInternalServerError)
err = errorTemplate.Execute(w, map[string]string{
"Short": "ID Not found",
"Long": "There was an issue reading ID: " + p.Id,
})
}
if err != nil {
logger.Println(err)
}
return
}
err = viewTemplate.Execute(w, p)
if err != nil {
logger.Println(err)
}
}
func stylesheet(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-type", "text/css")
_, _ = w.Write(stylesheetContent)
}
func index(w http.ResponseWriter, r *http.Request) {
err := indexTemplate.Execute(w, nil)
if err != nil {
logger.Println(err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
}
}
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