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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package typeutils
import (
"context"
"strconv"
"strings"
"code.superseriousbusiness.org/gotosocial/internal/config"
"code.superseriousbusiness.org/gotosocial/internal/gtserror"
"code.superseriousbusiness.org/gotosocial/internal/gtsmodel"
"code.superseriousbusiness.org/gotosocial/internal/text"
"github.com/gorilla/feeds"
)
const (
rssTitleMaxRunes = 128
rssDescriptionMaxRunes = 256
)
// see https://cyber.harvard.edu/rss/rss.html
func (c *Converter) StatusToRSSItem(ctx context.Context, status *gtsmodel.Status) (*feeds.Item, error) {
var err error
// Ensure account populated.
if status.Account == nil {
status.Account, err = c.state.DB.GetAccountByID(ctx, status.AccountID)
if err != nil {
return nil, gtserror.Newf("db error getting status author: %w", err)
}
}
// Get first attachment if present.
var media0 *gtsmodel.MediaAttachment
if status.AttachmentsPopulated() && len(status.Attachments) > 0 {
media0 = status.Attachments[0]
} else if len(status.AttachmentIDs) > 0 {
media0, err = c.state.DB.GetAttachmentByID(ctx, status.AttachmentIDs[0])
if err != nil {
return nil, gtserror.Newf("db error getting status attachment: %w", err)
}
}
// Title -- The title of the item.
// example: Venice Film Festival Tries to Quit Sinking
var title string
if status.ContentWarning != "" {
title = trimTo(status.ContentWarning, rssTitleMaxRunes)
} else {
title = trimTo(status.Text, rssTitleMaxRunes)
}
// Generate author name string for status.
authorName := "@" + status.Account.Username +
"@" + config.GetAccountDomain()
var buf strings.Builder
buf.Grow(512)
// Description -- The item synopsis.
// example: Some of the most heated chatter at the Venice Film Festival this week was
// about the way that the arrival of the stars at the Palazzo del Cinema was being staged.
buf.WriteString(authorName + " ")
switch l := len(status.AttachmentIDs); {
case l > 1:
buf.WriteString("posted [")
buf.WriteString(strconv.Itoa(l))
buf.WriteString("] attachments")
case l == 1:
buf.WriteString("posted 1 attachment")
default:
buf.WriteString("made a new post")
}
if status.Text != "" {
buf.WriteString(": \"")
buf.WriteString(status.Text)
buf.WriteString("\"")
}
description := trimTo(buf.String(), rssDescriptionMaxRunes)
// Enclosure, describes a media object
// that is attached to the item.
var enclosure *feeds.Enclosure
// Set media details.
if media0 != nil {
enclosure = new(feeds.Enclosure)
enclosure.Type = media0.File.ContentType
enclosure.Length = strconv.Itoa(media0.File.FileSize)
enclosure.Url = media0.URL
}
// Generate emojified content.
apiEmojis := c.emojisToAPI(ctx, status.Emojis, status.EmojiIDs)
content := text.EmojifyRSS(apiEmojis, status.Content)
return &feeds.Item{
// we specifcally do not set the author, as a lot
// of feed readers rely on the RSS standard of the
// author being an email with optional name. but
// our @username@domain identifiers break this.
//
// attribution is handled in the title/description.
// ID -- A string that uniquely identifies the item.
// example: http://inessential.com/2002/09/01.php#a2
Id: status.URL,
// Source -- The RSS channel that the item came from.
Source: &feeds.Link{Href: status.Account.URL + "/feed.rss"},
// Link -- The URL of the item.
// example: http://nytimes.com/2004/12/07FEST.html
Link: &feeds.Link{Href: status.URL},
Title: title,
Description: description,
IsPermaLink: "true",
Updated: status.EditedAt,
Created: status.CreatedAt,
Enclosure: enclosure,
Content: content,
}, nil
}
// trimTo trims the given `in` string to
// the length `to`, measured in runes.
//
// The reason for using runes is to avoid
// cutting off UTF-8 characters in the
// middle, and generating garbled bytes.
//
// If trimming was necessary, the returned
// string will be suffixed with ellipsis
// (`...`) to indicate omission.
func trimTo(in string, to int) string {
var (
runes = []rune(in)
runesLen = len(runes)
)
if runesLen <= to {
// Fine as-is.
return in
}
return string(runes[:to-3]) + "..."
}
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