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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 dereferencing
import (
"context"
"net/url"
"sync"
"codeberg.org/gruf/go-mutexes"
"github.com/superseriousbusiness/gotosocial/internal/ap"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/media"
"github.com/superseriousbusiness/gotosocial/internal/transport"
"github.com/superseriousbusiness/gotosocial/internal/typeutils"
)
// Dereferencer wraps logic and functionality for doing dereferencing of remote accounts, statuses, etc, from federated instances.
type Dereferencer interface {
// GetAccountByURI will attempt to fetch an account by its URI, first checking the database and in the case of a remote account will either check the
// last_fetched (and updating if beyond fetch interval) or dereferencing for the first-time if this remote account has never been encountered before.
GetAccountByURI(ctx context.Context, requestUser string, uri *url.URL, block bool) (*gtsmodel.Account, error)
// GetAccountByUsernameDomain will attempt to fetch an account by username@domain, first checking the database and in the case of a remote account will either
// check the last_fetched (and updating if beyond fetch interval) or dereferencing for the first-time if this remote account has never been encountered before.
GetAccountByUsernameDomain(ctx context.Context, requestUser string, username string, domain string, block bool) (*gtsmodel.Account, error)
// UpdateAccount updates the given account if last_fetched is beyond fetch interval (or if force is set). An updated account model is returned, any media fetching is done async.
UpdateAccount(ctx context.Context, requestUser string, account *gtsmodel.Account, force bool) (*gtsmodel.Account, error)
GetStatus(ctx context.Context, username string, remoteStatusID *url.URL, refetch, includeParent bool) (*gtsmodel.Status, ap.Statusable, error)
EnrichRemoteStatus(ctx context.Context, username string, status *gtsmodel.Status, includeParent bool) (*gtsmodel.Status, error)
GetRemoteInstance(ctx context.Context, username string, remoteInstanceURI *url.URL) (*gtsmodel.Instance, error)
DereferenceAnnounce(ctx context.Context, announce *gtsmodel.Status, requestingUsername string) error
DereferenceThread(ctx context.Context, username string, statusIRI *url.URL, status *gtsmodel.Status, statusable ap.Statusable)
GetRemoteMedia(ctx context.Context, requestingUsername string, accountID string, remoteURL string, ai *media.AdditionalMediaInfo) (*media.ProcessingMedia, error)
GetRemoteEmoji(ctx context.Context, requestingUsername string, remoteURL string, shortcode string, domain string, id string, emojiURI string, ai *media.AdditionalEmojiInfo, refresh bool) (*media.ProcessingEmoji, error)
Handshaking(username string, remoteAccountID *url.URL) bool
}
type deref struct {
db db.DB
typeConverter typeutils.TypeConverter
transportController transport.Controller
mediaManager media.Manager
derefAvatars map[string]*media.ProcessingMedia
derefAvatarsMu mutexes.Mutex
derefHeaders map[string]*media.ProcessingMedia
derefHeadersMu mutexes.Mutex
derefEmojis map[string]*media.ProcessingEmoji
derefEmojisMu mutexes.Mutex
handshakes map[string][]*url.URL
handshakeSync sync.Mutex // mutex to lock/unlock when checking or updating the handshakes map
}
// NewDereferencer returns a Dereferencer initialized with the given parameters.
func NewDereferencer(db db.DB, typeConverter typeutils.TypeConverter, transportController transport.Controller, mediaManager media.Manager) Dereferencer {
return &deref{
db: db,
typeConverter: typeConverter,
transportController: transportController,
mediaManager: mediaManager,
derefAvatars: make(map[string]*media.ProcessingMedia),
derefHeaders: make(map[string]*media.ProcessingMedia),
derefEmojis: make(map[string]*media.ProcessingEmoji),
handshakes: make(map[string][]*url.URL),
// use wrapped mutexes to allow safely deferring unlock
// even when more granular locks are required (only unlocks once).
derefAvatarsMu: mutexes.WithSafety(mutexes.New()),
derefHeadersMu: mutexes.WithSafety(mutexes.New()),
derefEmojisMu: mutexes.WithSafety(mutexes.New()),
}
}
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