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/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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"
"github.com/superseriousbusiness/gotosocial/internal/ap"
"github.com/superseriousbusiness/gotosocial/internal/config"
"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 {
GetRemoteAccount(ctx context.Context, username string, remoteAccountID *url.URL, refresh bool) (*gtsmodel.Account, bool, error)
EnrichRemoteAccount(ctx context.Context, username string, account *gtsmodel.Account) (*gtsmodel.Account, error)
GetRemoteStatus(ctx context.Context, username string, remoteStatusID *url.URL, refresh, includeParent bool) (*gtsmodel.Status, ap.Statusable, bool, 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)
// GetRemoteAttachment takes a minimal attachment struct and converts it into a fully fleshed out attachment, stored in the database and instance storage.
//
// The parameter minAttachment must have at least the following fields defined:
// * minAttachment.RemoteURL
// * minAttachment.AccountID
// * minAttachment.File.ContentType
//
// The returned attachment will have an ID generated for it, so no need to generate one beforehand.
// A blurhash will also be generated for the attachment.
//
// Most other fields will be preserved on the passed attachment, including:
// * minAttachment.StatusID
// * minAttachment.CreatedAt
// * minAttachment.UpdatedAt
// * minAttachment.FileMeta
// * minAttachment.AccountID
// * minAttachment.Description
// * minAttachment.ScheduledStatusID
// * minAttachment.Thumbnail.RemoteURL
// * minAttachment.Avatar
// * minAttachment.Header
//
// GetRemoteAttachment will return early if an attachment with the same value as minAttachment.RemoteURL
// is found in the database -- then that attachment will be returned and nothing else will be changed or stored.
GetRemoteAttachment(ctx context.Context, requestingUsername string, minAttachment *gtsmodel.MediaAttachment) (*gtsmodel.MediaAttachment, error)
// RefreshAttachment is like GetRemoteAttachment, but the attachment will always be dereferenced again,
// whether or not it was already stored in the database.
RefreshAttachment(ctx context.Context, requestingUsername string, minAttachment *gtsmodel.MediaAttachment) (*gtsmodel.MediaAttachment, error)
DereferenceAnnounce(ctx context.Context, announce *gtsmodel.Status, requestingUsername string) error
DereferenceThread(ctx context.Context, username string, statusIRI *url.URL) error
Handshaking(ctx context.Context, username string, remoteAccountID *url.URL) bool
}
type deref struct {
db db.DB
typeConverter typeutils.TypeConverter
transportController transport.Controller
mediaHandler media.Handler
config *config.Config
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(config *config.Config, db db.DB, typeConverter typeutils.TypeConverter, transportController transport.Controller, mediaHandler media.Handler) Dereferencer {
return &deref{
db: db,
typeConverter: typeConverter,
transportController: transportController,
mediaHandler: mediaHandler,
config: config,
handshakeSync: &sync.Mutex{},
}
}
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