/* The MIT License (MIT) Copyright (c) 2014-2017 DutchCoders [https://github.com/dutchcoders/] Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ package server import ( // _ "transfer.sh/app/handlers" // _ "transfer.sh/app/utils" "archive/tar" "archive/zip" "bytes" "compress/gzip" "encoding/json" "errors" "fmt" "html" html_template "html/template" "io" "io/ioutil" "log" "math/rand" "mime" "net/http" "net/url" "os" "path" "path/filepath" "strconv" "strings" "sync" text_template "text/template" "time" "net" web "github.com/dutchcoders/transfer.sh-web" "github.com/gorilla/mux" "github.com/russross/blackfriday" "encoding/base64" qrcode "github.com/skip2/go-qrcode" ) var ( htmlTemplates = initHTMLTemplates() textTemplates = initTextTemplates() ) func stripPrefix(path string) string { return strings.Replace(path, web.Prefix+"/", "", -1) } func initTextTemplates() *text_template.Template { templateMap := text_template.FuncMap{"format": formatNumber} // Templates with functions available to them var templates = text_template.New("").Funcs(templateMap) return templates } func initHTMLTemplates() *html_template.Template { templateMap := html_template.FuncMap{"format": formatNumber} // Templates with functions available to them var templates = html_template.New("").Funcs(templateMap) return templates } func healthHandler(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Approaching Neutral Zone, all systems normal and functioning.") } /* The preview handler will show a preview of the content for browsers (accept type text/html), and referer is not transfer.sh */ func (s *Server) previewHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) token := vars["token"] filename := vars["filename"] contentType, contentLength, err := s.storage.Head(token, filename) if err != nil { http.Error(w, http.StatusText(404), 404) return } var templatePath string var content html_template.HTML switch { case strings.HasPrefix(contentType, "image/"): templatePath = "download.image.html" case strings.HasPrefix(contentType, "video/"): templatePath = "download.video.html" case strings.HasPrefix(contentType, "audio/"): templatePath = "download.audio.html" case strings.HasPrefix(contentType, "text/"): templatePath = "download.markdown.html" var reader io.ReadCloser if reader, _, _, err = s.storage.Get(token, filename); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } var data []byte if data, err = ioutil.ReadAll(reader); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } if strings.HasPrefix(contentType, "text/x-markdown") || strings.HasPrefix(contentType, "text/markdown") { escapedData := html.EscapeString(string(data)) output := blackfriday.MarkdownCommon([]byte(escapedData)) content = html_template.HTML(output) } else if strings.HasPrefix(contentType, "text/plain") { content = html_template.HTML(fmt.Sprintf("
%s
", html.EscapeString(string(data)))) } else { templatePath = "download.sandbox.html" } default: templatePath = "download.html" } if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } resolvedUrl := resolveUrl(r, getURL(r).ResolveReference(r.URL), true) var png []byte png, err = qrcode.Encode(resolvedUrl, qrcode.High, 150) if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } qrCode := base64.StdEncoding.EncodeToString(png) hostname := getURL(r).Host webAddress := resolveWebAddress(r) data := struct { ContentType string Content html_template.HTML Filename string Url string Hostname string WebAddress string ContentLength uint64 GAKey string UserVoiceKey string QRCode string }{ contentType, content, filename, resolvedUrl, hostname, webAddress, contentLength, s.gaKey, s.userVoiceKey, qrCode, } if err := htmlTemplates.ExecuteTemplate(w, templatePath, data); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } } // this handler will output html or text, depending on the // support of the client (Accept header). func (s *Server) viewHandler(w http.ResponseWriter, r *http.Request) { // vars := mux.Vars(r) hostname := getURL(r).Host webAddress := resolveWebAddress(r) data := struct { Hostname string WebAddress string GAKey string UserVoiceKey string }{ hostname, webAddress, s.gaKey, s.userVoiceKey, } if acceptsHTML(r.Header) { if err := htmlTemplates.ExecuteTemplate(w, "index.html", data); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } } else { if err := textTemplates.ExecuteTemplate(w, "index.txt", data); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } } } func (s *Server) notFoundHandler(w http.ResponseWriter, r *http.Request) { http.Error(w, http.StatusText(404), 404) } func sanitize(fileName string) string { return path.Clean(path.Base(fileName)) } func (s *Server) postHandler(w http.ResponseWriter, r *http.Request) { if err := r.ParseMultipartForm(_24K); nil != err { log.Printf("%s", err.Error()) http.Error(w, "Error occurred copying to output stream", 500) return } token := Encode(10000000 + int64(rand.Intn(1000000000))) w.Header().Set("Content-Type", "text/plain") for _, fheaders := range r.MultipartForm.File { for _, fheader := range fheaders { filename := sanitize(fheader.Filename) contentType := fheader.Header.Get("Content-Type") if contentType == "" { contentType = mime.TypeByExtension(filepath.Ext(fheader.Filename)) } var f io.Reader var err error if f, err = fheader.Open(); err != nil { log.Printf("%s", err.Error()) http.Error(w, err.Error(), 500) return } var b bytes.Buffer n, err := io.CopyN(&b, f, _24K+1) if err != nil && err != io.EOF { log.Printf("%s", err.Error()) http.Error(w, err.Error(), 500) return } var file *os.File var reader io.Reader if n > _24K { file, err = ioutil.TempFile(s.tempPath, "transfer-") if err != nil { log.Fatal(err) } n, err = io.Copy(file, io.MultiReader(&b, f)) if err != nil { cleanTmpFile(file) log.Printf("%s", err.Error()) http.Error(w, err.Error(), 500) return } reader, err = os.Open(file.Name()) } else { reader = bytes.NewReader(b.Bytes()) } contentLength := n metadata := MetadataForRequest(contentType, r) buffer := &bytes.Buffer{} if err := json.NewEncoder(buffer).Encode(metadata); err != nil { log.Printf("%s", err.Error()) http.Error(w, errors.New("Could not encode metadata").Error(), 500) cleanTmpFile(file) return } else if err := s.storage.Put(token, fmt.Sprintf("%s.metadata", filename), buffer, "text/json", uint64(buffer.Len())); err != nil { log.Printf("%s", err.Error()) http.Error(w, errors.New("Could not save metadata").Error(), 500) cleanTmpFile(file) return } log.Printf("Uploading %s %s %d %s", token, filename, contentLength, contentType) if err = s.storage.Put(token, filename, reader, contentType, uint64(contentLength)); err != nil { log.Printf("Backend storage error: %s", err.Error()) http.Error(w, err.Error(), 500) return } relativeURL, _ := url.Parse(path.Join(token, filename)) fmt.Fprintln(w, getURL(r).ResolveReference(relativeURL).String()) cleanTmpFile(file) } } } func cleanTmpFile(f *os.File) { if f != nil { f.Close() os.Remove(f.Name()) } } type Metadata struct { // ContentType is the original uploading content type ContentType string // Secret as knowledge to delete file // Secret string // Downloads is the actual number of downloads Downloads int // MaxDownloads contains the maximum numbers of downloads MaxDownloads int // MaxDate contains the max age of the file MaxDate time.Time // DeletionToken contains the token to match against for deletion DeletionToken string } func MetadataForRequest(contentType string, r *http.Request) Metadata { metadata := Metadata{ ContentType: contentType, MaxDate: time.Now().Add(time.Hour * 24 * 365 * 10), Downloads: 0, MaxDownloads: 99999999, DeletionToken: Encode(10000000+int64(rand.Intn(1000000000))) + Encode(10000000+int64(rand.Intn(1000000000))), } if v := r.Header.Get("Max-Downloads"); v == "" { } else if v, err := strconv.Atoi(v); err != nil { } else { metadata.MaxDownloads = v } if v := r.Header.Get("Max-Days"); v == "" { } else if v, err := strconv.Atoi(v); err != nil { } else { metadata.MaxDate = time.Now().Add(time.Hour * 24 * time.Duration(v)) } return metadata } func (s *Server) putHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) filename := sanitize(vars["filename"]) contentLength := r.ContentLength var reader io.Reader reader = r.Body defer r.Body.Close() if contentLength == -1 { // queue file to disk, because s3 needs content length var err error var f io.Reader f = reader var b bytes.Buffer n, err := io.CopyN(&b, f, _24K+1) if err != nil && err != io.EOF { log.Printf("Error putting new file: %s", err.Error()) http.Error(w, err.Error(), 500) return } var file *os.File if n > _24K { file, err = ioutil.TempFile(s.tempPath, "transfer-") if err != nil { log.Printf("%s", err.Error()) http.Error(w, err.Error(), 500) return } defer cleanTmpFile(file) n, err = io.Copy(file, io.MultiReader(&b, f)) if err != nil { log.Printf("%s", err.Error()) http.Error(w, err.Error(), 500) return } reader, err = os.Open(file.Name()) } else { reader = bytes.NewReader(b.Bytes()) } contentLength = n } if contentLength == 0 { log.Print("Empty content-length") http.Error(w, errors.New("Could not uplpoad empty file").Error(), 400) return } contentType := r.Header.Get("Content-Type") if contentType == "" { contentType = mime.TypeByExtension(filepath.Ext(vars["filename"])) } token := Encode(10000000 + int64(rand.Intn(1000000000))) metadata := MetadataForRequest(contentType, r) buffer := &bytes.Buffer{} if err := json.NewEncoder(buffer).Encode(metadata); err != nil { log.Printf("%s", err.Error()) http.Error(w, errors.New("Could not encode metadata").Error(), 500) return } else if err := s.storage.Put(token, fmt.Sprintf("%s.metadata", filename), buffer, "text/json", uint64(buffer.Len())); err != nil { log.Printf("%s", err.Error()) http.Error(w, errors.New("Could not save metadata").Error(), 500) return } log.Printf("Uploading %s %s %d %s", token, filename, contentLength, contentType) var err error if err = s.storage.Put(token, filename, reader, contentType, uint64(contentLength)); err != nil { log.Printf("Error putting new file: %s", err.Error()) http.Error(w, errors.New("Could not save file").Error(), 500) return } // w.Statuscode = 200 w.Header().Set("Content-Type", "text/plain") relativeURL, _ := url.Parse(path.Join(token, filename)) deleteUrl, _ := url.Parse(path.Join(token, filename, metadata.DeletionToken)) w.Header().Set("X-Url-Delete", resolveUrl(r, deleteUrl, true)) fmt.Fprint(w, resolveUrl(r, relativeURL, false)) } func resolveUrl(r *http.Request, u *url.URL, absolutePath bool) string { if u.RawQuery != "" { u.Path = fmt.Sprintf("%s?%s", u.Path, url.QueryEscape(u.RawQuery)) u.RawQuery = "" } if u.Fragment != "" { u.Path = fmt.Sprintf("%s#%s", u.Path, u.Fragment) u.Fragment = "" } if absolutePath { r.URL.Path = "" } return getURL(r).ResolveReference(u).String() } func resolveWebAddress(r *http.Request) string { url := getURL(r) return fmt.Sprintf("%s://%s", url.ResolveReference(url).Scheme, url.ResolveReference(url).Host) } func getURL(r *http.Request) *url.URL { u, _ := url.Parse(r.URL.String()) if r.TLS != nil { u.Scheme = "https" } else if proto := r.Header.Get("X-Forwarded-Proto"); proto != "" { u.Scheme = proto } else { u.Scheme = "http" } if u.Host != "" { } else if host, port, err := net.SplitHostPort(r.Host); err != nil { u.Host = r.Host } else { if port == "80" && u.Scheme == "http" { u.Host = host } else if port == "443" && u.Scheme == "https" { u.Host = host } else { u.Host = net.JoinHostPort(host, port) } } return u } func (s *Server) Lock(token, filename string) error { key := path.Join(token, filename) if _, ok := s.locks[key]; !ok { s.locks[key] = &sync.Mutex{} } s.locks[key].Lock() return nil } func (s *Server) Unlock(token, filename string) error { key := path.Join(token, filename) s.locks[key].Unlock() return nil } func (s *Server) CheckMetadata(token, filename string) error { s.Lock(token, filename) defer s.Unlock(token, filename) var metadata Metadata r, _, _, err := s.storage.Get(token, fmt.Sprintf("%s.metadata", filename)) if s.storage.IsNotExist(err) { return nil } else if err != nil { return err } defer r.Close() if err := json.NewDecoder(r).Decode(&metadata); err != nil { return err } else if metadata.Downloads >= metadata.MaxDownloads { return errors.New("MaxDownloads expired.") } else if time.Now().After(metadata.MaxDate) { return errors.New("MaxDate expired.") } else { // todo(nl5887): mutex? // update number of downloads metadata.Downloads++ buffer := &bytes.Buffer{} if err := json.NewEncoder(buffer).Encode(metadata); err != nil { return errors.New("Could not encode metadata") } else if err := s.storage.Put(token, fmt.Sprintf("%s.metadata", filename), buffer, "text/json", uint64(buffer.Len())); err != nil { return errors.New("Could not save metadata") } } return nil } func (s *Server) CheckDeletionToken(deletionToken, token, filename string) error { s.Lock(token, filename) defer s.Unlock(token, filename) var metadata Metadata r, _, _, err := s.storage.Get(token, fmt.Sprintf("%s.metadata", filename)) if s.storage.IsNotExist(err) { return nil } else if err != nil { return err } defer r.Close() if err := json.NewDecoder(r).Decode(&metadata); err != nil { return err } else if metadata.DeletionToken != deletionToken { return errors.New("Deletion token doesn't match.") } return nil } func (s *Server) deleteHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) token := vars["token"] filename := vars["filename"] deletionToken := vars["deletionToken"] if err := s.CheckDeletionToken(deletionToken, token, filename); err != nil { log.Printf("Error metadata: %s", err.Error()) http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound) return } err := s.storage.Delete(token, filename) if s.storage.IsNotExist(err) { http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound) return } else if err != nil { log.Printf("%s", err.Error()) http.Error(w, "Could not delete file.", 500) return } } func (s *Server) zipHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) files := vars["files"] zipfilename := fmt.Sprintf("transfersh-%d.zip", uint16(time.Now().UnixNano())) w.Header().Set("Content-Type", "application/zip") w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", zipfilename)) w.Header().Set("Connection", "close") zw := zip.NewWriter(w) for _, key := range strings.Split(files, ",") { if strings.HasPrefix(key, "/") { key = key[1:] } key = strings.Replace(key, "\\", "/", -1) token := strings.Split(key, "/")[0] filename := sanitize(strings.Split(key, "/")[1]) if err := s.CheckMetadata(token, filename); err != nil { log.Printf("Error metadata: %s", err.Error()) continue } reader, _, _, err := s.storage.Get(token, filename) if err != nil { if s.storage.IsNotExist(err) { http.Error(w, "File not found", 404) return } else { log.Printf("%s", err.Error()) http.Error(w, "Could not retrieve file.", 500) return } } defer reader.Close() header := &zip.FileHeader{ Name: strings.Split(key, "/")[1], Method: zip.Store, ModifiedTime: uint16(time.Now().UnixNano()), ModifiedDate: uint16(time.Now().UnixNano()), } fw, err := zw.CreateHeader(header) if err != nil { log.Printf("%s", err.Error()) http.Error(w, "Internal server error.", 500) return } if _, err = io.Copy(fw, reader); err != nil { log.Printf("%s", err.Error()) http.Error(w, "Internal server error.", 500) return } } if err := zw.Close(); err != nil { log.Printf("%s", err.Error()) http.Error(w, "Internal server error.", 500) return } } func (s *Server) tarGzHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) files := vars["files"] tarfilename := fmt.Sprintf("transfersh-%d.tar.gz", uint16(time.Now().UnixNano())) w.Header().Set("Content-Type", "application/x-gzip") w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", tarfilename)) w.Header().Set("Connection", "close") os := gzip.NewWriter(w) defer os.Close() zw := tar.NewWriter(os) defer zw.Close() for _, key := range strings.Split(files, ",") { if strings.HasPrefix(key, "/") { key = key[1:] } key = strings.Replace(key, "\\", "/", -1) token := strings.Split(key, "/")[0] filename := sanitize(strings.Split(key, "/")[1]) if err := s.CheckMetadata(token, filename); err != nil { log.Printf("Error metadata: %s", err.Error()) continue } reader, _, contentLength, err := s.storage.Get(token, filename) if err != nil { if s.storage.IsNotExist(err) { http.Error(w, "File not found", 404) return } else { log.Printf("%s", err.Error()) http.Error(w, "Could not retrieve file.", 500) return } } defer reader.Close() header := &tar.Header{ Name: strings.Split(key, "/")[1], Size: int64(contentLength), } err = zw.WriteHeader(header) if err != nil { log.Printf("%s", err.Error()) http.Error(w, "Internal server error.", 500) return } if _, err = io.Copy(zw, reader); err != nil { log.Printf("%s", err.Error()) http.Error(w, "Internal server error.", 500) return } } } func (s *Server) tarHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) files := vars["files"] tarfilename := fmt.Sprintf("transfersh-%d.tar", uint16(time.Now().UnixNano())) w.Header().Set("Content-Type", "application/x-tar") w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", tarfilename)) w.Header().Set("Connection", "close") zw := tar.NewWriter(w) defer zw.Close() for _, key := range strings.Split(files, ",") { token := strings.Split(key, "/")[0] filename := strings.Split(key, "/")[1] if err := s.CheckMetadata(token, filename); err != nil { log.Printf("Error metadata: %s", err.Error()) continue } reader, _, contentLength, err := s.storage.Get(token, filename) if err != nil { if s.storage.IsNotExist(err) { http.Error(w, "File not found", 404) return } else { log.Printf("%s", err.Error()) http.Error(w, "Could not retrieve file.", 500) return } } defer reader.Close() header := &tar.Header{ Name: strings.Split(key, "/")[1], Size: int64(contentLength), } err = zw.WriteHeader(header) if err != nil { log.Printf("%s", err.Error()) http.Error(w, "Internal server error.", 500) return } if _, err = io.Copy(zw, reader); err != nil { log.Printf("%s", err.Error()) http.Error(w, "Internal server error.", 500) return } } } func (s *Server) headHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) token := vars["token"] filename := vars["filename"] if err := s.CheckMetadata(token, filename); err != nil { log.Printf("Error metadata: %s", err.Error()) http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound) return } contentType, contentLength, err := s.storage.Head(token, filename) if s.storage.IsNotExist(err) { http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound) return } else if err != nil { log.Printf("%s", err.Error()) http.Error(w, "Could not retrieve file.", 500) return } w.Header().Set("Content-Type", contentType) w.Header().Set("Content-Length", strconv.FormatUint(contentLength, 10)) w.Header().Set("Connection", "close") } func (s *Server) getHandler(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) action := vars["action"] token := vars["token"] filename := vars["filename"] if err := s.CheckMetadata(token, filename); err != nil { log.Printf("Error metadata: %s", err.Error()) http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound) return } reader, contentType, contentLength, err := s.storage.Get(token, filename) if s.storage.IsNotExist(err) { http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound) return } else if err != nil { log.Printf("%s", err.Error()) http.Error(w, "Could not retrieve file.", 500) return } defer reader.Close() var disposition string if action == "inline" { disposition = "inline" } else { disposition = "attachment" } w.Header().Set("Content-Type", contentType) w.Header().Set("Content-Length", strconv.FormatUint(contentLength, 10)) w.Header().Set("Content-Disposition", fmt.Sprintf("%s; filename=\"%s\"", disposition, filename)) w.Header().Set("Connection", "keep-alive") file, err := ioutil.TempFile(s.tempPath, "range-") if err != nil { log.Printf("%s", err.Error()) http.Error(w, "Error occurred copying to output stream", 500) return } defer cleanTmpFile(file) tee := io.TeeReader(reader, file) _, err = ioutil.ReadAll(tee) if err != nil { log.Printf("%s", err.Error()) http.Error(w, "Error occurred copying to output stream", 500) return } http.ServeContent(w, r, filename, time.Now(), file) } func (s *Server) RedirectHandler(h http.Handler) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { if !s.forceHTTPs { // we don't want to enforce https } else if r.URL.Path == "/health.html" { // health check url won't redirect } else if strings.HasSuffix(ipAddrFromRemoteAddr(r.Host), ".onion") { // .onion addresses cannot get a valid certificate, so don't redirect } else if r.Header.Get("X-Forwarded-Proto") == "https" { } else if r.URL.Scheme == "https" { } else { u := getURL(r) u.Scheme = "https" http.Redirect(w, r, u.String(), http.StatusPermanentRedirect) return } h.ServeHTTP(w, r) } } // Create a log handler for every request it receives. func LoveHandler(h http.Handler) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { w.Header().Set("x-made-with", "<3 by DutchCoders") w.Header().Set("x-served-by", "Proudly served by DutchCoders") w.Header().Set("Server", "Transfer.sh HTTP Server 1.0") h.ServeHTTP(w, r) } } func (s *Server) BasicAuthHandler(h http.Handler) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { if s.AuthUser == "" || s.AuthPass == "" { h.ServeHTTP(w, r) return } w.Header().Set("WWW-Authenticate", "Basic realm=\"Restricted\"") username, password, authOK := r.BasicAuth() if authOK == false { http.Error(w, "Not authorized", 401) return } if username != s.AuthUser || password != s.AuthPass { http.Error(w, "Not authorized", 401) return } h.ServeHTTP(w, r) } }