/* Copyright © 2022 Seednode */ package cmd import ( "fmt" "io" "net/http" "net/url" "os" "path/filepath" "strconv" "strings" "time" ) type appHandler func(http.ResponseWriter, *http.Request) error func (fn appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { if err := fn(w, r); err != nil { http.Error(w, err.Error(), 500) } } const LOGDATE string = "2006-01-02T15:04:05.000-07:00" const PREFIX string = "/src" func stripQueryParam(inUrl string) (string, error) { url, err := url.Parse(inUrl) if err != nil { return "", err } url.RawQuery = "" return url.String(), nil } func refererToUri(referer string) string { parts := strings.SplitAfterN(referer, "/", 4) if len(parts) < 4 { return "" } return "/" + parts[3] } func serveHtml(w http.ResponseWriter, r *http.Request, filePath string) error { fileName := filepath.Base(filePath) w.Header().Add("Content-Type", "text/html") htmlBody := ` ` htmlBody += fileName htmlBody += ` ` htmlBody += fmt.Sprintf(` ` _, err := io.WriteString(w, htmlBody) if err != nil { return err } return nil } func serveStaticFile(w http.ResponseWriter, r *http.Request, paths []string) error { strippedUrl, err := stripQueryParam(r.URL.Path) if err != nil { return err } prefixedFilePath, err := url.QueryUnescape(strippedUrl) if err != nil { return err } filePath := strings.TrimPrefix(prefixedFilePath, PREFIX) if !pathIsValid(filePath, paths) { http.NotFound(w, r) } exists, err := fileExists(filePath) if err != nil { return err } if !exists { http.NotFound(w, r) return nil } var startTime time.Time if Verbose { startTime = time.Now() fmt.Printf("%v Serving file: %v", startTime.Format(LOGDATE), filePath) } buf, err := os.ReadFile(filePath) if err != nil { return err } w.Write(buf) if Verbose { fmt.Printf(" (Finished in %v)\n", time.Since(startTime).Round(time.Microsecond)) } return nil } func serveStaticFileHandler(paths []string) appHandler { return func(w http.ResponseWriter, r *http.Request) error { err := serveStaticFile(w, r, paths) if err != nil { return err } return nil } } func serveHtmlHandler(paths []string) appHandler { return func(w http.ResponseWriter, r *http.Request) error { refererUri, err := stripQueryParam(refererToUri(r.Referer())) if err != nil { return err } filter := r.URL.Query().Get("f") sorting := r.URL.Query().Get("s") switch { case r.URL.Path == "/" && sorting == "asc" && refererUri != "": query, err := url.QueryUnescape(refererUri) if err != nil { return err } path, err := splitPath(query) if err != nil { return err } filePath, err := getNextFile(path) if err != nil { return err } if filePath == "" { filePath, err = pickFile(paths, filter, sorting) switch { case err != nil && err == ErrNoImagesFound: http.NotFound(w, r) return nil case err != nil: return err } path, err := splitPath(filePath) if err != nil { return err } filePath, err = getFirstFile(path) if err != nil { return err } } newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting) http.Redirect(w, r, newUrl, http.StatusSeeOther) case r.URL.Path == "/" && sorting == "asc" && refererUri == "": filePath, err := pickFile(paths, filter, sorting) if err != nil && err == ErrNoImagesFound { http.NotFound(w, r) return nil } else if err != nil { return err } path, err := splitPath(filePath) if err != nil { return err } filePath, err = getFirstFile(path) if err != nil { return err } newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting) http.Redirect(w, r, newUrl, http.StatusSeeOther) case r.URL.Path == "/" && sorting == "desc" && refererUri != "": query, err := url.QueryUnescape(refererUri) if err != nil { return err } path, err := splitPath(query) if err != nil { return err } filePath, err := getPreviousFile(path) if err != nil { return err } if filePath == "" { filePath, err = pickFile(paths, filter, sorting) switch { case err != nil && err == ErrNoImagesFound: http.NotFound(w, r) return nil case err != nil: return err } path, err := splitPath(filePath) if err != nil { return err } filePath, err = getLastFile(path) if err != nil { return err } } newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting) http.Redirect(w, r, newUrl, http.StatusSeeOther) case r.URL.Path == "/" && sorting == "desc" && refererUri == "": filePath, err := pickFile(paths, filter, sorting) if err != nil && err == ErrNoImagesFound { http.NotFound(w, r) return nil } else if err != nil { return err } path, err := splitPath(filePath) if err != nil { return err } filePath, err = getLastFile(path) if err != nil { return err } newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting) http.Redirect(w, r, newUrl, http.StatusSeeOther) case r.URL.Path == "/": filePath, err := pickFile(paths, filter, sorting) if err != nil && err == ErrNoImagesFound { http.NotFound(w, r) return nil } else if err != nil { return err } newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting) http.Redirect(w, r, newUrl, http.StatusSeeOther) default: filePath := r.URL.Path image, err := isImage(filePath) if err != nil { return err } if !image { http.NotFound(w, r) return nil } err = serveHtml(w, r, filePath) if err != nil { return err } } return nil } } func doNothing(http.ResponseWriter, *http.Request) {} func ServePage(args []string) error { paths, err := normalizePaths(args) if err != nil { return err } for _, i := range paths { fmt.Println("Paths: " + i) } http.Handle("/", serveHtmlHandler(paths)) http.Handle(PREFIX+"/", http.StripPrefix(PREFIX, serveStaticFileHandler(paths))) http.HandleFunc("/favicon.ico", doNothing) err = http.ListenAndServe(":"+strconv.Itoa(Port), nil) if err != nil { return err } return nil }