Simplest form file uploader.
It just saves uploaded file from HTML form to the new file on the disk.
Also it calculates BLAKE2s checksum, replying with it in the answer.
+
+You can upload files with curl:
+
+ curl -F fileupload=@somedata.tar.gpg http://localhost:8086/upload/
+
+You can verify integrity locally:
+
+ b2sum -a blake2s somedata.tar.gpg
"flag"
"fmt"
"io"
+ "log"
"net"
"net/http"
"os"
)
func upload(w http.ResponseWriter, r *http.Request) {
+ log.Println(r.RemoteAddr, "connected")
if r.Method == http.MethodGet {
w.Write([]byte(`<html>
<head><title>Upload</title></head><body>
}
mr, err := r.MultipartReader()
if err != nil {
- fmt.Println(err)
+ log.Println(r.RemoteAddr, err)
return
}
p, err := mr.NextPart()
if err != nil {
- fmt.Println(err)
+ log.Println(r.RemoteAddr, err)
return
}
if p.FormName() != "fileupload" {
- fmt.Println("non file form field")
+ log.Println(r.RemoteAddr, "non file form field")
return
}
- now := time.Now()
- fd, err := os.OpenFile(now.Format(time.RFC3339Nano), os.O_WRONLY|os.O_CREATE, 0600)
+ fn := time.Now().Format(time.RFC3339Nano)
+ fd, err := os.OpenFile(fn, os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
- fmt.Println(err)
+ log.Println(r.RemoteAddr, fn, p.FileName(), err)
return
}
defer fd.Close()
mw := io.MultiWriter(fdBuf, h)
n, err := io.Copy(mw, p)
if err != nil {
- fmt.Println(err)
+ log.Println(r.RemoteAddr, fn, p.FileName(), err)
return
}
if err = fdBuf.Flush(); err != nil {
- fmt.Println(err)
+ log.Println(r.RemoteAddr, fn, p.FileName(), err)
return
}
- fmt.Fprintf(w, "bytes: %d\nBLAKE2s: %s\n", n, hex.EncodeToString(h.Sum(nil)))
+ sum := hex.EncodeToString(h.Sum(nil))
+ fmt.Fprintf(w, "bytes: %d\nBLAKE2s: %s\n", n, sum)
+ log.Println(r.RemoteAddr, fn, p.FileName(), n, sum)
}
func main() {
if err != nil {
panic(err)
}
- fmt.Println("listening on", *bind)
+ log.Println("listening", *bind)
ln = netutil.LimitListener(ln, *conns)
s := &http.Server{
ReadHeaderTimeout: 10 * time.Second,