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package main
import (
"net/http"
"html/template"
"log"
"fmt"
"embed"
"io"
"os"
"path"
"path/filepath"
"flag"
"bufio"
"errors"
"io/fs"
"github.com/google/uuid"
"golang.org/x/crypto/bcrypt"
)
//go:embed templates
var tmplFS embed.FS
//go:embed favicon.ico
var favicon []byte
type BoxHandler struct {
filesPath string
token []byte
deleteEnabled bool
index bool
}
func serve(w http.ResponseWriter, token []byte, views ...string) {
t, err := template.New("index.html").ParseFS(tmplFS, views...)
if err != nil {
log.Fatal(err)
}
if err := t.Execute(w, token != nil); err != nil {
log.Fatal(err)
}
}
func (handler BoxHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
switch r.Method {
case http.MethodGet:
if r.URL.Path == "/favicon.ico" {
w.Write(favicon)
return
}
if r.URL.Path == "/" {
serve(w, handler.token, "templates/index.html")
} else {
resourceId := path.Base(r.URL.Path)
resourcePath := filepath.Join(handler.filesPath, resourceId)
fi, err := os.Stat(resourcePath)
if errors.Is(err, fs.ErrNotExist) {
log.Println(err)
w.WriteHeader(http.StatusNotFound)
return
} else if err != nil {
log.Println(err)
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprint(w, err)
return
}
if fi.IsDir() && !handler.index {
log.Println("Index requested but not enabled")
w.WriteHeader(http.StatusNotFound)
return
}
http.ServeFile(w, r, resourcePath)
}
return
case http.MethodDelete:
if !handler.deleteEnabled {
w.WriteHeader(http.StatusForbidden)
return
}
token := r.Header.Get("X-Token")
if bcrypt.CompareHashAndPassword(handler.token, []byte(token)) != nil {
log.Println("unauthorized")
w.WriteHeader(http.StatusUnauthorized)
return
}
resourceId := path.Base(r.URL.Path)
filename := filepath.Join(handler.filesPath, resourceId)
err := os.Remove(filename)
if err != nil {
log.Println(err)
w.WriteHeader(http.StatusBadRequest)
fmt.Fprint(w, err.Error())
return
}
log.Printf("Deleted %s", filename)
w.WriteHeader(http.StatusNoContent)
case http.MethodPost:
if r.URL.Path != "/upload" {
w.WriteHeader(http.StatusBadRequest)
return
}
token := r.Header.Get("X-Token")
if bcrypt.CompareHashAndPassword(handler.token, []byte(token)) != nil {
log.Println("unauthorized")
w.WriteHeader(http.StatusUnauthorized)
return
}
ext := r.Header.Get("X-ResourceMeta-Extension")
u, err := uuid.NewRandom()
if err != nil {
log.Println(err)
fmt.Fprint(w, err.Error())
w.WriteHeader(http.StatusInternalServerError)
return
}
filename := filepath.Join(handler.filesPath, u.String()) + ext
log.Printf("Boxing %s...\n", filename)
f, err := os.Create(filename)
if err != nil {
log.Println(err)
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprint(w, err.Error())
return
}
defer f.Close()
defer r.Body.Close()
io.Copy(f, r.Body)
w.Header().Add("X-Resource-ID", filepath.Base(filename))
log.Printf("Boxed %s\n", filename)
default:
w.WriteHeader(http.StatusMethodNotAllowed)
}
}
func main() {
host := flag.String("n", "", "The hostname to listen on")
port := flag.Int("p", 8080, "The port to listen on")
isToken := flag.Bool("t", false, "Use a token to protect uploads/deletes")
filesPath := flag.String("d", "", "The path to the files")
deleteEnabled := flag.Bool("D", false, "Enable deleting resources")
index := flag.Bool("i", false, "Enable displaying the resource folder index")
flag.Parse()
var token []byte = nil
if *isToken {
tok := os.Getenv("BOX_TOKEN")
if tok == "" {
fmt.Print("Token: ")
sc := bufio.NewScanner(os.Stdin)
sc.Scan()
tok = sc.Text()
}
var err error = nil
token, err = bcrypt.GenerateFromPassword([]byte(tok), bcrypt.DefaultCost)
if err != nil {
panic(err)
}
}
boxHandler := BoxHandler {
*filesPath,
token,
*deleteEnabled,
*index,
}
if boxHandler.filesPath != "" {
err := os.MkdirAll(boxHandler.filesPath, 0750)
if err != nil {
log.Fatal(err)
}
}
log.Printf("Listening on %s:%d", *host, *port)
log.Fatal(http.ListenAndServe(fmt.Sprintf("%s:%d", *host, *port), boxHandler))
}
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