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//
// rhimportd
//
// The Radio Helsinki Rivendell Import Daemon
//
//
// Copyright (C) 2015-2016 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhimportd.
//
// rhimportd is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// rhimportd is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with rhimportd. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"bytes"
"encoding/json"
"io"
"mime/multipart"
"net/http"
"code.helsinki.at/rhrd-go/rddb"
"code.helsinki.at/rhrd-go/rhimport"
)
type webUploadResponseData struct {
ResponseCode int `json:"RESPONSE_CODE"`
ErrorString string `json:"ERROR_STRING"`
}
func webUploadErrorResponse(w http.ResponseWriter, code int, errStr string) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(code)
encoder := json.NewEncoder(w)
respdata := webUploadResponseData{code, errStr}
encoder.Encode(respdata)
}
func webUploadSuccessResponse(w http.ResponseWriter) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
encoder := json.NewEncoder(w)
respdata := webUploadResponseData{http.StatusOK, "success"}
encoder.Encode(respdata)
}
const (
webUploadMaxRequestSize = (2 << 30) - 1 // 2GB, (2 << 30) overflows int on 32-bit systems therefore we use 2GB - 1 Byte
)
func webUploadParseForm(r *http.Request) (username, sessionid, srcfile string, src *multipart.Part, err error) {
var mpr *multipart.Reader
if mpr, err = r.MultipartReader(); err != nil {
return
}
for {
var p *multipart.Part
if p, err = mpr.NextPart(); err != nil {
if err == io.EOF {
err = nil
}
return
}
var dstfield *string
switch p.FormName() {
case "LOGIN_NAME":
dstfield = &username
case "SESSION_ID":
dstfield = &sessionid
case "FILENAME":
srcfile = p.FileName()
src = p
return // don't read any fields beyond this point because we would need to load the whole file in order to continue parsing
default:
rhdl.Printf("WebUploadHandler: ingoring unknown form field: '%s'", p.FormName())
continue
}
var buf bytes.Buffer
if _, err = io.CopyN(&buf, p, 1<<10); err != nil && err != io.EOF { // 1kB should be enough
return
}
*dstfield = buf.String()
p.Close()
}
}
func webUploadHandler(conf *rhimport.Config, db *rddb.DBChan, sessions *rhimport.SessionStoreChan, trusted bool, w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
http.Redirect(w, r, "/static/upload-form.html", http.StatusTemporaryRedirect)
return
}
if r.Method != "POST" {
rhl.Printf("WebUploadHandler: got invalid request method")
webUploadErrorResponse(w, http.StatusMethodNotAllowed, "only POST and GET method are allowed")
return
}
// This is from: stackoverflow.com/questions/26392196
if r.ContentLength > webUploadMaxRequestSize {
rhl.Printf("WebUploadHandler: request is too large: %d > %d", r.ContentLength, webUploadMaxRequestSize)
webUploadErrorResponse(w, http.StatusExpectationFailed, "request too large")
return
}
r.Body = http.MaxBytesReader(w, r.Body, webUploadMaxRequestSize)
username, sessionid, srcfile, src, err := webUploadParseForm(r)
if err != nil {
rhl.Printf("WebUploadHandler: error while parsing multipart-form: %v", err)
webUploadErrorResponse(w, http.StatusBadRequest, err.Error())
return
}
if username == "" {
webUploadErrorResponse(w, http.StatusBadRequest, "missing field LOGIN_NAME")
return
}
if sessionid == "" {
webUploadErrorResponse(w, http.StatusBadRequest, "missing field SESSION_ID")
return
}
if srcfile == "" || src == nil {
webUploadErrorResponse(w, http.StatusBadRequest, "missing field FILENAME")
return
}
s, _, code, _ := sessions.Get(username, sessionid)
if code != http.StatusOK {
webUploadErrorResponse(w, http.StatusUnauthorized, "session not found")
return
}
cancel, attachmentChan := s.AttachUploader()
if attachmentChan == nil || cancel == nil {
rhl.Printf("WebUploadHandler: refusing file upload for '%s': session already uploading", srcfile)
webUploadErrorResponse(w, http.StatusForbidden, "upload already in progress")
return
}
defer close(attachmentChan)
rhl.Printf("WebUploadHandler: starting upload for file '%s'", srcfile)
for {
chunk := rhimport.AttachmentChunk{}
var data [128 * 1024]byte
n, err := src.Read(data[:])
if n > 0 {
chunk.Data = data[:n]
if err == io.EOF {
err = nil
}
}
chunk.Error = err
if err == io.EOF {
rhl.Printf("WebUploadHandler: upload for file '%s' finished", srcfile)
webUploadSuccessResponse(w)
return
}
select {
case <-cancel:
rhl.Printf("WebUploadHandler: upload for file '%s' got canceld", srcfile)
webUploadErrorResponse(w, http.StatusNoContent, "canceled")
return
case attachmentChan <- chunk:
}
if err != nil {
webUploadErrorResponse(w, http.StatusInternalServerError, err.Error())
return
}
}
}
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