package gmitohtml import ( "bufio" "bytes" "errors" "fmt" "html" "net/url" "path" "strings" "sync" ) // ErrInvalidURL is the error returned when the URL is invalid. var ErrInvalidURL = errors.New("invalid URL") var daemonAddress string var assetLock sync.Mutex func rewriteURL(u string, loc *url.URL) string { if daemonAddress != "" { scheme := "gemini" if strings.HasPrefix(loc.Path, "/file/") { scheme = "file" } if strings.HasPrefix(u, "file://") { if !allowFileAccess { return "http://" + daemonAddress + "/?FileAccessNotAllowed" } return "http://" + daemonAddress + "/file/" + u[7:] } offset := 0 if strings.HasPrefix(u, "gemini://") { offset = 9 } firstSlash := strings.IndexRune(u[offset:], '/') if firstSlash != -1 { u = strings.ToLower(u[:firstSlash+offset]) + u[firstSlash+offset:] } if strings.HasPrefix(u, "gemini://") { return "http://" + daemonAddress + "/gemini/" + u[9:] } else if strings.Contains(u, "://") { return u } else if loc != nil && len(u) > 0 && !strings.HasPrefix(u, "//") { if u[0] != '/' { if loc.Path[len(loc.Path)-1] == '/' { u = path.Join("/", loc.Path, u) } else { u = path.Join("/", path.Dir(loc.Path), u) } } return "http://" + daemonAddress + "/" + scheme + "/" + strings.ToLower(loc.Host) + u } return "http://" + daemonAddress + "/" + scheme + "/" + u } return u } func newPage() []byte { data := []byte(pageHeader) if daemonAddress != "" { data = append(data, navHeader...) } return append(data, contentHeader...) } // Convert converts text/gemini to text/html. func Convert(page []byte, u string) []byte { var result []byte var preformatted bool parsedURL, err := url.Parse(u) if err != nil { parsedURL = nil err = nil } scanner := bufio.NewScanner(bytes.NewReader(page)) for scanner.Scan() { line := scanner.Bytes() l := len(line) if l >= 3 && string(line[0:3]) == "```" { preformatted = !preformatted if preformatted { result = append(result, []byte("
\n")...)
			} else {
				result = append(result, []byte("
\n")...) } continue } if preformatted { result = append(result, html.EscapeString(string(line))...) result = append(result, []byte("\n")...) continue } if l >= 6 && bytes.HasPrefix(line, []byte("=>")) { splitStart := 2 if line[splitStart] == ' ' || line[splitStart] == '\t' { splitStart++ } var split [][]byte firstSpace := bytes.IndexRune(line[splitStart:], ' ') firstTab := bytes.IndexRune(line[splitStart:], '\t') if firstSpace != -1 && (firstTab == -1 || firstSpace < firstTab) { split = bytes.SplitN(line[splitStart:], []byte(" "), 2) } else if firstTab != -1 { split = bytes.SplitN(line[splitStart:], []byte("\t"), 2) } var linkURL []byte var linkLabel []byte if len(split) == 2 { linkURL = split[0] linkLabel = split[1] } else { linkURL = line[splitStart:] linkLabel = line[splitStart:] } link := append([]byte(``)...) link = append(link, html.EscapeString(string(linkLabel))...) link = append(link, []byte(``)...) result = append(result, link...) result = append(result, []byte("
")...) continue } heading := 0 for i := 0; i < l; i++ { if line[i] == '#' { heading++ } else { break } } if heading > 0 { result = append(result, []byte(fmt.Sprintf("%s", heading, html.EscapeString(string(line[heading:])), heading))...) continue } result = append(result, html.EscapeString(string(line))...) result = append(result, []byte("
")...) } if preformatted { result = append(result, []byte("\n")...) } data := newPage() data = append(data, result...) data = append(data, []byte(pageFooter)...) return fillTemplateVariables(data, u, false) }