package hinters import ( "encoding/base64" "regexp" "github.com/liamg/darktile/internal/app/darktile/termutil" ) func init() { register(&Base64Hinter{}, PriorityVeryLow) } type Base64Hinter struct { target string } var base64Matcher = regexp.MustCompile("(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})") func (h *Base64Hinter) Match(text string, cursorIndex int) (matched bool, offset int, length int) { matches := base64Matcher.FindAllStringIndex(text, -1) for _, match := range matches { if match[0] <= cursorIndex && match[1] > cursorIndex { result := text[match[0]:match[1]] if len(result) > 4 && isReadable(result) { return true, match[0], match[1] - match[0] } } } return } func isReadable(result string) bool { parts, err := base64.StdEncoding.DecodeString(result) if err != nil { return false } for i := range parts { if (parts[i] > 0x7e || parts[i] < 0x20) && parts[i] != 0x0a && parts[i] != 0x0d { return false } } return true } func (h *Base64Hinter) Activate(api HintAPI, match string, start termutil.Position, end termutil.Position) error { h.target = match result, err := base64.StdEncoding.DecodeString(match) if err != nil { return err } api.Highlight(start, end, "Base64 decodes to:\n"+string(result), nil) return nil } func (h *Base64Hinter) Deactivate(api HintAPI) error { api.ClearHighlight() return nil } func (h *Base64Hinter) Click(api HintAPI) error { return nil }