Function fetchOpenGraphData

helpers.go:693–742

(ctx context.Context, urlStr string)

		return "", fmt.Errorf("failed to decrypt: %w", err)
	}

	return string(plaintext), nil
}

func extractFirstURL(text string) string {
	match := urlRegex.FindString(text)
	if match == "" {
		return ""
	}

	return match
}
func fetchOpenGraphData(ctx context.Context, urlStr string) openGraphResult {
	pageData, _, err := fetchURLBytes(ctx, urlStr, openGraphPageMaxBytes)
	if err != nil {
		log.Warn().Err(err).Str("url", urlStr).Msg("Failed to fetch URL for Open Graph data")
		return openGraphResult{}
	}

	doc, err := goquery.NewDocumentFromReader(bytes.NewReader(pageData))
	if err != nil {
		log.Warn().Err(err).Str("url", urlStr).Msg("Failed to parse HTML for Open Graph data")
		return openGraphResult{}
	}

	title := doc.Find(`meta[property="og:title"]`).AttrOr("content", "")
	if title == "" {
		title = strings.TrimSpace(doc.Find("title").Text())
	}

	description := doc.Find(`meta[property="og:description"]`).AttrOr("content", "")
	if description == "" {
		description = doc.Find(`meta[name="description"]`).AttrOr("content", "")
	}

	var imageURLStr string
	selectors := []struct {
		selector string
		attr     string
	}{
		{`meta[property="og:image"]`, "content"},
		{`meta[property="twitter:image"]`, "content"},
		{`link[rel="apple-touch-icon"]`, "href"},
		{`link[rel="icon"]`, "href"},
	}

	for _, s := range selectors {
		imageURLStr, _ = doc.Find(s.selector).Attr(s.attr)
		if imageURLStr != "" {
			break
		}
	}