mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-10-31 15:12:26 -05:00
111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package status
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import (
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"fmt"
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"net/http"
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"net/url"
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"regexp"
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"github.com/PuerkitoBio/goquery"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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)
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var urlRegex = regexp.MustCompile(`https?://[a-zA-Z0-9./?=_-]+`)
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func extractLastURL(text string) string {
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matches := urlRegex.FindAllString(text, -1)
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if len(matches) == 0 {
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return ""
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}
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return matches[len(matches)-1]
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}
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// FetchPreview retrieves OpenGraph metadata from a URL.
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func FetchPreview(text string) (*gtsmodel.Card, gtserror.WithCode) {
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link := extractLastURL(text)
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if link == "" {
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return nil, nil
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}
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parsed, err := url.ParseRequestURI(link)
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if err != nil {
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return nil, gtserror.NewErrorInternalError(err, "invalid URL")
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}
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if parsed.Scheme != "http" && parsed.Scheme != "https" {
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return nil, gtserror.NewErrorInternalError(fmt.Errorf("unsupported scheme: %s", parsed.Scheme))
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}
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resp, err := http.Get(link)
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if err != nil {
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return nil, gtserror.NewErrorInternalError(err, "request failed")
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return nil, gtserror.NewErrorInternalError(fmt.Errorf("unexpected status: %s", resp.Status))
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}
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doc, err := goquery.NewDocumentFromReader(resp.Body)
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if err != nil {
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return nil, gtserror.NewErrorInternalError(fmt.Errorf("failed to parse HTML: %w", err))
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}
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card := >smodel.Card{
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URL: link,
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}
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doc.Find("meta").Each(func(i int, s *goquery.Selection) {
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property, _ := s.Attr("property")
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content, _ := s.Attr("content")
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switch property {
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case "og:title":
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card.Title = content
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case "og:description":
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card.Description = content
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case "og:type":
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card.Type = content
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case "og:image":
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card.Image = content
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case "og:url":
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if content != "" {
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card.URL = content
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}
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case "og:site_name":
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card.ProviderName = content
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}
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})
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if card.Title == "" {
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card.Title = doc.Find("title").Text()
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}
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if card.Description == "" {
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desc, exists := doc.Find("meta[name='description']").Attr("content")
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if exists {
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card.Description = desc
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}
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}
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return card, nil
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}
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