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