` htmlBody += fileName htmlBody += `

/* Copyright © 2022 Seednode */ package cmd import ( "fmt" "io" "net/http" "net/url" "os" "path/filepath" "regexp" "runtime" "strconv" "strings" "time" ) const ( LOGDATE string = "2006-01-02T15:04:05.000-07:00" PREFIX string = "/src" RedirectStatusCode int = http.StatusSeeOther ) type Filters struct { Includes []string Excludes []string } func (f *Filters) IsEmpty() bool { if !(f.HasIncludes() && f.HasExcludes()) { return true } return false } func (f *Filters) HasIncludes() bool { if len(f.Includes) == 0 { return false } return true } func (f *Filters) GetIncludes() string { return strings.Join(f.Includes, ",") } func (f *Filters) HasExcludes() bool { if len(f.Excludes) == 0 { return false } return true } func (f *Filters) GetExcludes() string { return strings.Join(f.Excludes, ",") } 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) } } func splitQueryParams(query string) []string { if query == "" { return []string{} } params := strings.Split(query, ",") for i := 0; i < len(params); i++ { params[i] = strings.ToLower(params[i]) } return params } func generateQueryParams(filters *Filters, sort string) string { switch { case Filter && !Sort: return fmt.Sprintf("?include=%v&exclude=%v", filters.GetIncludes(), filters.GetExcludes(), ) case !Filter && Sort: return fmt.Sprintf("?sort=%v", sort) case Filter && Sort: return fmt.Sprintf("?include=%v&exclude=%v&sort=%v", filters.GetIncludes(), filters.GetExcludes(), sort, ) } return "" } func stripQueryParams(inUrl string) (string, error) { url, err := url.Parse(inUrl) if err != nil { return "", err } url.RawQuery = "" if runtime.GOOS == "windows" { return strings.TrimPrefix(url.String(), "/"), nil } 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 += ` ` switch { case Filter && Sort: 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 := stripQueryParams(r.URL.Path) if err != nil { return err } prefixedFilePath, err := url.QueryUnescape(strippedUrl) if err != nil { return err } filePath, err := filepath.EvalSymlinks(strings.TrimPrefix(prefixedFilePath, PREFIX)) if err != nil { return err } 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 } startTime := time.Now() buf, err := os.ReadFile(filePath) if err != nil { return err } w.Write(buf) if Verbose { fmt.Printf("%v | Served %v (%v) to %v in %v\n", startTime.Format(LOGDATE), filePath, humanReadableSize(len(buf)), r.RemoteAddr, 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, re regexp.Regexp, fileCache *[]string) appHandler { return func(w http.ResponseWriter, r *http.Request) error { refererUri, err := stripQueryParams(refererToUri(r.Referer())) if err != nil { return err } filters := Filters{} if Filter { filters.Includes = splitQueryParams(r.URL.Query().Get("include")) filters.Excludes = splitQueryParams(r.URL.Query().Get("exclude")) } else { fmt.Println("Filters disabled") } sortOrder := "" if Sort { sortOrder = r.URL.Query().Get("sort") } switch { case r.URL.Path == "/" && sortOrder == "asc" && refererUri != "": query, err := url.QueryUnescape(refererUri) if err != nil { return err } path, err := splitPath(query, re) if err != nil { return err } filePath, err := getNextFile(path) if err != nil { return err } if filePath == "" { filePath, err = pickFile(paths, &filters, sortOrder, fileCache) switch { case err != nil && err == ErrNoImagesFound: http.NotFound(w, r) return nil case err != nil: return err } path, err := splitPath(filePath, re) if err != nil { return err } filePath, err = getFirstFile(path) if err != nil { return err } } newUrl := fmt.Sprintf("http://%v%v%v", r.Host, preparePath(filePath), generateQueryParams(&filters, sortOrder), ) http.Redirect(w, r, newUrl, RedirectStatusCode) case r.URL.Path == "/" && sortOrder == "asc" && refererUri == "": filePath, err := pickFile(paths, &filters, sortOrder, fileCache) if err != nil && err == ErrNoImagesFound { http.NotFound(w, r) return nil } else if err != nil { return err } path, err := splitPath(filePath, re) if err != nil { return err } filePath, err = getFirstFile(path) if err != nil { return err } newUrl := fmt.Sprintf("http://%v%v%v", r.Host, preparePath(filePath), generateQueryParams(&filters, sortOrder), ) http.Redirect(w, r, newUrl, RedirectStatusCode) case r.URL.Path == "/" && sortOrder == "desc" && refererUri != "": query, err := url.QueryUnescape(refererUri) if err != nil { return err } path, err := splitPath(query, re) if err != nil { return err } filePath, err := getPreviousFile(path) if err != nil { return err } if filePath == "" { filePath, err = pickFile(paths, &filters, sortOrder, fileCache) switch { case err != nil && err == ErrNoImagesFound: http.NotFound(w, r) return nil case err != nil: return err } path, err := splitPath(filePath, re) if err != nil { return err } filePath, err = getLastFile(path) if err != nil { return err } } newUrl := fmt.Sprintf("http://%v%v%v", r.Host, preparePath(filePath), generateQueryParams(&filters, sortOrder), ) http.Redirect(w, r, newUrl, RedirectStatusCode) case r.URL.Path == "/" && sortOrder == "desc" && refererUri == "": filePath, err := pickFile(paths, &filters, sortOrder, fileCache) if err != nil && err == ErrNoImagesFound { http.NotFound(w, r) return nil } else if err != nil { return err } path, err := splitPath(filePath, re) if err != nil { return err } filePath, err = getLastFile(path) if err != nil { return err } newUrl := fmt.Sprintf("http://%v%v%v", r.Host, preparePath(filePath), generateQueryParams(&filters, sortOrder), ) fmt.Printf("New URL is %v\n", newUrl) http.Redirect(w, r, newUrl, RedirectStatusCode) case r.URL.Path == "/": filePath, err := pickFile(paths, &filters, sortOrder, fileCache) if err != nil && err == ErrNoImagesFound { http.NotFound(w, r) return nil } else if err != nil { return err } newUrl := fmt.Sprintf("http://%v%v%v", r.Host, preparePath(filePath), generateQueryParams(&filters, sortOrder), ) http.Redirect(w, r, newUrl, RedirectStatusCode) default: filePath := r.URL.Path if runtime.GOOS == "windows" { filePath = strings.TrimPrefix(filePath, "/") } exists, err := fileExists(filePath) if err != nil { return err } if !exists { http.NotFound(w, r) return nil } 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 { fmt.Printf("roulette v%v\n\n", Version) paths, err := normalizePaths(args) if err != nil { return err } re := regexp.MustCompile(`(.+)([0-9]{3})(\..+)`) fileCache := []string{} http.Handle("/", serveHtmlHandler(paths, *re, &fileCache)) http.Handle(PREFIX+"/", http.StripPrefix(PREFIX, serveStaticFileHandler(paths))) http.HandleFunc("/favicon.ico", doNothing) err = http.ListenAndServe(":"+strconv.FormatInt(int64(Port), 10), nil) if err != nil { return err } return nil }