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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 federation
import (
"net/http"
"net/url"
"sync"
"github.com/go-fed/activity/pub"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/federation/federatingdb"
"github.com/superseriousbusiness/gotosocial/internal/transport"
"github.com/superseriousbusiness/gotosocial/internal/typeutils"
)
// Federator wraps various interfaces and functions to manage activitypub federation from gotosocial
type Federator interface {
// FederatingActor returns the underlying pub.FederatingActor, which can be used to send activities, and serve actors at inboxes/outboxes.
FederatingActor() pub.FederatingActor
// FederatingDB returns the underlying FederatingDB interface.
FederatingDB() federatingdb.DB
// AuthenticateFederatedRequest can be used to check the authenticity of incoming http-signed requests for federating resources.
// The given username will be used to create a transport for making outgoing requests. See the implementation for more detailed comments.
AuthenticateFederatedRequest(username string, r *http.Request) (*url.URL, error)
// FingerRemoteAccount performs a webfinger lookup for a remote account, using the .well-known path. It will return the ActivityPub URI for that
// account, or an error if it doesn't exist or can't be retrieved.
FingerRemoteAccount(requestingUsername string, targetUsername string, targetDomain string) (*url.URL, error)
// DereferenceRemoteAccount can be used to get the representation of a remote account, based on the account ID (which is a URI).
// The given username will be used to create a transport for making outgoing requests. See the implementation for more detailed comments.
DereferenceRemoteAccount(username string, remoteAccountID *url.URL) (typeutils.Accountable, error)
// DereferenceRemoteStatus can be used to get the representation of a remote status, based on its ID (which is a URI).
// The given username will be used to create a transport for making outgoing requests. See the implementation for more detailed comments.
DereferenceRemoteStatus(username string, remoteStatusID *url.URL) (typeutils.Statusable, error)
// GetTransportForUser returns a new transport initialized with the key credentials belonging to the given username.
// This can be used for making signed http requests.
//
// If username is an empty string, our instance user's credentials will be used instead.
GetTransportForUser(username string) (transport.Transport, error)
// Handshaking returns true if the given username is currently in the process of dereferencing the remoteAccountID.
Handshaking(username string, remoteAccountID *url.URL) bool
pub.CommonBehavior
pub.FederatingProtocol
}
type federator struct {
config *config.Config
db db.DB
federatingDB federatingdb.DB
clock pub.Clock
typeConverter typeutils.TypeConverter
transportController transport.Controller
actor pub.FederatingActor
log *logrus.Logger
handshakes map[string][]*url.URL
handshakeSync *sync.Mutex // mutex to lock/unlock when checking or updating the handshakes map
}
// NewFederator returns a new federator
func NewFederator(db db.DB, federatingDB federatingdb.DB, transportController transport.Controller, config *config.Config, log *logrus.Logger, typeConverter typeutils.TypeConverter) Federator {
clock := &Clock{}
f := &federator{
config: config,
db: db,
federatingDB: federatingDB,
clock: &Clock{},
typeConverter: typeConverter,
transportController: transportController,
log: log,
handshakeSync: &sync.Mutex{},
}
actor := newFederatingActor(f, f, federatingDB, clock)
f.actor = actor
return f
}
func (f *federator) FederatingActor() pub.FederatingActor {
return f.actor
}
func (f *federator) FederatingDB() federatingdb.DB {
return f.federatingDB
}
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