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package main
import (
"crypto/rand"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/robert-nix/ansihtml"
flag "github.com/spf13/pflag"
)
const (
MetadataExt = ".metadata"
)
type Server struct {
data string
}
type Metadata struct {
ContentType string `json:"contentType"`
}
func writeMetadata(filename string, m *Metadata) error {
f, err := os.OpenFile(filename, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0o644)
if err != nil {
return err
}
j := json.NewEncoder(f)
return j.Encode(m)
}
func readMetadata(filename string) (*Metadata, error) {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
var m Metadata
j := json.NewDecoder(f)
if err := j.Decode(&m); err != nil {
return nil, err
}
return &m, nil
}
func (s *Server) Post(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
return
}
var random [16]byte
_, err := io.ReadFull(rand.Reader, random[:])
if err != nil {
log.Print("io.ReadFull(rand.Reader): ", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
name := base64.RawURLEncoding.EncodeToString(random[:])
filename := filepath.Join(s.data, name)
f, err := os.OpenFile(filename, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0o644)
if err != nil {
log.Print("OpenFile(): ", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
defer f.Close()
if _, err = io.Copy(f, r.Body); err != nil {
log.Print("io.Copy(): ", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
m := Metadata{
ContentType: r.Header.Get("content-type"),
}
if err = writeMetadata(filename+MetadataExt, &m); err != nil {
log.Print("writeMetadata(): ", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusCreated)
fmt.Fprintf(w, "/%s\n", name)
}
func serveAnsiHtml(w http.ResponseWriter, filename string) {
f, err := os.Open(filename)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
w.Header().Add("content-type", "text/html")
data, err := io.ReadAll(f)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
data = ansihtml.ConvertToHTML(data)
data = []byte(fmt.Sprintf("<pre>%s</pre>", strings.ReplaceAll(string(data), "\n", "<br>")))
w.Write(data)
}
func (s *Server) Get(w http.ResponseWriter, r *http.Request) {
path := r.URL.Path
if path == "/" {
w.Header().Add("content-type", "text/plain; charset=UTF-8")
w.Write([]byte("Bin-ки и глогинки"))
return
}
filename := filepath.Join(s.data, path)
m, err := readMetadata(filename + MetadataExt)
if err != nil {
log.Print("readMetadata(): ", err)
w.WriteHeader(http.StatusNotFound)
return
}
h := w.Header()
switch m.ContentType {
case "text/x-ansi":
serveAnsiHtml(w, filename)
return
case "":
m.ContentType = "application/octet-stream"
default:
}
h.Add("content-type", m.ContentType)
http.ServeFile(w, r, filename)
}
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case "POST":
s.Post(w, r)
case "GET":
s.Get(w, r)
}
}
func main() {
var (
addr string
data string
)
flag.StringVarP(&addr, "addr", "a", "0.0.0.0:9000", "The address to bind to")
flag.StringVarP(&data, "data-path", "d", "./data", "The path to the data")
flag.Parse()
datadir, err := filepath.Abs(data)
if err != nil {
log.Fatal(err)
}
s := &Server{
data: datadir,
}
log.Printf("Listening at '%s'...", addr)
if err := http.ListenAndServe(addr, s); err != nil {
log.Fatal(err)
}
}
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