mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
5543fd5340
* [feature/frontend] Add options to include Unlisted posts or hide all posts * finish up * swagger * move invalidate call into bundb package, avoid invalidating if not necessary * rename show_web_statuses => web_visibility * don't use ptr for webvisibility * last bits
180 lines
6 KiB
Go
180 lines
6 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 account
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import (
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"context"
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"errors"
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"fmt"
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"time"
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"github.com/gorilla/feeds"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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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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const (
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rssFeedLength = 20
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)
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type GetRSSFeed func() (string, gtserror.WithCode)
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// GetRSSFeedForUsername returns a function to return the RSS feed of a local account
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// with the given username, and the last-modified time (time that the account last
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// posted a status eligible to be included in the rss feed).
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//
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// To save db calls, callers to this function should only call the returned GetRSSFeed
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// func if the last-modified time is newer than the last-modified time they have cached.
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//
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// If the account has not yet posted an RSS-eligible status, the returned last-modified
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// time will be zero, and the GetRSSFeed func will return a valid RSS xml with no items.
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func (p *Processor) GetRSSFeedForUsername(ctx context.Context, username string) (GetRSSFeed, time.Time, gtserror.WithCode) {
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var (
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never = time.Time{}
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)
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account, err := p.state.DB.GetAccountByUsernameDomain(ctx, username, "")
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if err != nil {
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if errors.Is(err, db.ErrNoEntries) {
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// Simply no account with this username.
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err = gtserror.New("account not found")
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return nil, never, gtserror.NewErrorNotFound(err)
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}
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// Real db error.
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err = gtserror.Newf("db error getting account %s: %w", username, err)
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return nil, never, gtserror.NewErrorInternalError(err)
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}
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// Ensure account has rss feed enabled.
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if !*account.Settings.EnableRSS {
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err = gtserror.New("account RSS feed not enabled")
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return nil, never, gtserror.NewErrorNotFound(err)
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}
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// Ensure account stats populated.
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if err := p.state.DB.PopulateAccountStats(ctx, account); err != nil {
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err = gtserror.Newf("db error getting account stats %s: %w", username, err)
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return nil, never, gtserror.NewErrorInternalError(err)
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}
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// LastModified time is needed by callers to check freshness for cacheing.
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// This might be a zero time.Time if account has never posted a status that's
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// eligible to appear in the RSS feed; that's fine.
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lastPostAt := account.Stats.LastStatusAt
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return func() (string, gtserror.WithCode) {
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// Assemble author namestring once only.
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author := "@" + account.Username + "@" + config.GetAccountDomain()
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// Derive image/thumbnail for this account (may be nil).
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image, errWithCode := p.rssImageForAccount(ctx, account, author)
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if errWithCode != nil {
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return "", errWithCode
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}
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feed := &feeds.Feed{
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Title: "Posts from " + author,
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Description: "Posts from " + author,
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Link: &feeds.Link{Href: account.URL},
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Image: image,
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}
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// If the account has never posted anything, just use
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// account creation time as Updated value for the feed;
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// we could use time.Now() here but this would likely
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// mess up cacheing; we want something determinate.
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//
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// We can also return early rather than wasting a db call,
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// since we already know there's no eligible statuses.
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if lastPostAt.IsZero() {
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feed.Updated = account.CreatedAt
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return stringifyFeed(feed)
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}
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// Account has posted at least one status that's
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// eligible to appear in the RSS feed.
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//
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// Reuse the lastPostAt value for feed.Updated.
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feed.Updated = lastPostAt
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// Retrieve latest statuses as they'd be shown on the web view of the account profile.
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statuses, err := p.state.DB.GetAccountWebStatuses(ctx, account, rssFeedLength, "")
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if err != nil && !errors.Is(err, db.ErrNoEntries) {
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err = fmt.Errorf("db error getting account web statuses: %w", err)
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return "", gtserror.NewErrorInternalError(err)
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}
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// Add each status to the rss feed.
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for _, status := range statuses {
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item, err := p.converter.StatusToRSSItem(ctx, status)
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if err != nil {
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err = gtserror.Newf("error converting status to feed item: %w", err)
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return "", gtserror.NewErrorInternalError(err)
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}
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feed.Add(item)
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}
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return stringifyFeed(feed)
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}, lastPostAt, nil
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}
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func (p *Processor) rssImageForAccount(ctx context.Context, account *gtsmodel.Account, author string) (*feeds.Image, gtserror.WithCode) {
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if account.AvatarMediaAttachmentID == "" {
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// No image, no problem!
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return nil, nil
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}
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// Ensure account avatar attachment populated.
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if account.AvatarMediaAttachment == nil {
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var err error
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account.AvatarMediaAttachment, err = p.state.DB.GetAttachmentByID(ctx, account.AvatarMediaAttachmentID)
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if err != nil {
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if errors.Is(err, db.ErrNoEntries) {
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// No attachment found with this ID (race condition?).
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return nil, nil
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}
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// Real db error.
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err = gtserror.Newf("db error fetching avatar media attachment: %w", err)
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return nil, gtserror.NewErrorInternalError(err)
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}
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}
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return &feeds.Image{
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Url: account.AvatarMediaAttachment.Thumbnail.URL,
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Title: "Avatar for " + author,
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Link: account.URL,
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}, nil
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}
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func stringifyFeed(feed *feeds.Feed) (string, gtserror.WithCode) {
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// Stringify the feed. Even with no statuses,
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// this will still produce valid rss xml.
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rss, err := feed.ToRss()
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if err != nil {
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err := gtserror.Newf("error converting feed to rss string: %w", err)
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return "", gtserror.NewErrorInternalError(err)
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}
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return rss, nil
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}
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