` htmlBody += fileName htmlBody += `

/* Copyright © 2022 Seednode */ package cmd import ( "errors" "fmt" "io" "log" "net/http" "net/url" "os" "path/filepath" "strconv" "strings" "time" ) const LOGDATE string = "2006-01-02T15:04:05.000000000-07:00" const PREFIX string = "/src" func stripQueryParam(inUrl string) string { u, err := url.Parse(inUrl) if err != nil { panic(err) } u.RawQuery = "" return u.String() } 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 { prefixedFilePath, err := url.QueryUnescape(stripQueryParam(r.URL.Path)) if err != nil { return err } fmt.Println("Prefixed file path is " + prefixedFilePath) filePath := strings.TrimPrefix(prefixedFilePath, PREFIX) var matchesPrefix = false for i := 0; i < len(paths); i++ { if strings.HasPrefix(filePath, paths[i]) { matchesPrefix = true } } if !matchesPrefix { if Verbose { fmt.Printf("%v Failed to serve file outside specified path(s): %v\n", time.Now().Format(LOGDATE), filePath) } http.NotFound(w, &r) return nil } _, err = os.Stat(filePath) if errors.Is(err, os.ErrNotExist) { if Verbose { fmt.Printf("%v Failed to serve non-existent file: %v\n", time.Now().Format(LOGDATE), filePath) } http.NotFound(w, &r) return nil } else if !errors.Is(err, os.ErrNotExist) && err != nil { return err } 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) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { err := serveStaticFile(w, *r, paths) if err != nil { log.Fatal(err) } } } func serveHtmlHandler(paths []string) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { refererUri := stripQueryParam(refererToUri(r.Referer())) filter := r.URL.Query().Get("filter") switch { case r.URL.Path == "/" && Successive && refererUri != "": query, err := url.QueryUnescape(refererUri) if err != nil { log.Fatal(err) } filePath, err := getNextFile(query) if err != nil { log.Fatal(err) } if filePath == "" { filePath, err = pickFile(paths, filter) switch { case err != nil && err == ErrNoImagesFound: http.NotFound(w, r) return case err != nil: log.Fatal(err) } filePath, err = getFirstFile(filePath) if err != nil { log.Fatal(err) } } newUrl := fmt.Sprintf("%v%v?filter=%v", r.URL.Host, filePath, filter) http.Redirect(w, r, newUrl, http.StatusSeeOther) case r.URL.Path == "/" && Successive && refererUri == "": filePath, err := pickFile(paths, filter) switch { case err != nil && err == ErrNoImagesFound: http.NotFound(w, r) return case err != nil: log.Fatal(err) } filePath, err = getFirstFile(filePath) if err != nil { log.Fatal(err) } newUrl := fmt.Sprintf("%v%v?filter=%v", r.URL.Host, filePath, filter) http.Redirect(w, r, newUrl, http.StatusSeeOther) case r.URL.Path == "/": filePath, err := pickFile(paths, filter) switch { case err != nil && err == ErrNoImagesFound: http.NotFound(w, r) return case err != nil: log.Fatal(err) } newUrl := fmt.Sprintf("%v%v?filter=%v", r.URL.Host, filePath, filter) http.Redirect(w, r, newUrl, http.StatusSeeOther) default: filePath := r.URL.Path isImage, err := checkIfImage(filePath) if err != nil { log.Fatal(err) } if !isImage { http.NotFound(w, r) } err = serveHtml(w, *r, filePath) if err != nil { log.Fatal(err) } } } } func doNothing(http.ResponseWriter, *http.Request) {} func ServePage(args []string) { paths, err := normalizePaths(args) if err != nil { log.Fatal(err) } for _, i := range paths { fmt.Println("Paths: " + i) } http.HandleFunc("/", serveHtmlHandler(paths)) http.Handle(PREFIX+"/", http.StripPrefix(PREFIX, serveStaticFileHandler(paths))) http.HandleFunc("/favicon.ico", doNothing) port := strconv.Itoa(Port) err = http.ListenAndServe(":"+port, nil) if err != nil { log.Fatal(err) } }