1 files changed, 152 insertions, 0 deletions
diff --git a/internal/federation/commonbehavior.go b/internal/federation/commonbehavior.go
new file mode 100644
index 000000000..9274e78b4
--- /dev/null
+++ b/internal/federation/commonbehavior.go
@@ -0,0 +1,152 @@
+/*
+   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 (
+	"context"
+	"fmt"
+	"net/http"
+	"net/url"
+
+	"github.com/go-fed/activity/pub"
+	"github.com/go-fed/activity/streams/vocab"
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+	"github.com/superseriousbusiness/gotosocial/internal/util"
+)
+
+/*
+	GOFED COMMON BEHAVIOR INTERFACE
+	Contains functions required for both the Social API and Federating Protocol.
+	It is passed to the library as a dependency injection from the client
+	application.
+*/
+
+// AuthenticateGetInbox delegates the authentication of a GET to an
+// inbox.
+//
+// Always called, regardless whether the Federated Protocol or Social
+// API is enabled.
+//
+// If an error is returned, it is passed back to the caller of
+// GetInbox. In this case, the implementation must not write a
+// response to the ResponseWriter as is expected that the client will
+// do so when handling the error. The 'authenticated' is ignored.
+//
+// If no error is returned, but authentication or authorization fails,
+// then authenticated must be false and error nil. It is expected that
+// the implementation handles writing to the ResponseWriter in this
+// case.
+//
+// Finally, if the authentication and authorization succeeds, then
+// authenticated must be true and error nil. The request will continue
+// to be processed.
+func (f *federator) AuthenticateGetInbox(ctx context.Context, w http.ResponseWriter, r *http.Request) (context.Context, bool, error) {
+	// IMPLEMENTATION NOTE: For GoToSocial, we serve outboxes and inboxes through
+	// the CLIENT API, not through the federation API, so we just do nothing here.
+	return nil, false, nil
+}
+
+// AuthenticateGetOutbox delegates the authentication of a GET to an
+// outbox.
+//
+// Always called, regardless whether the Federated Protocol or Social
+// API is enabled.
+//
+// If an error is returned, it is passed back to the caller of
+// GetOutbox. In this case, the implementation must not write a
+// response to the ResponseWriter as is expected that the client will
+// do so when handling the error. The 'authenticated' is ignored.
+//
+// If no error is returned, but authentication or authorization fails,
+// then authenticated must be false and error nil. It is expected that
+// the implementation handles writing to the ResponseWriter in this
+// case.
+//
+// Finally, if the authentication and authorization succeeds, then
+// authenticated must be true and error nil. The request will continue
+// to be processed.
+func (f *federator) AuthenticateGetOutbox(ctx context.Context, w http.ResponseWriter, r *http.Request) (context.Context, bool, error) {
+	// IMPLEMENTATION NOTE: For GoToSocial, we serve outboxes and inboxes through
+	// the CLIENT API, not through the federation API, so we just do nothing here.
+	return nil, false, nil
+}
+
+// GetOutbox returns the OrderedCollection inbox of the actor for this
+// context. It is up to the implementation to provide the correct
+// collection for the kind of authorization given in the request.
+//
+// AuthenticateGetOutbox will be called prior to this.
+//
+// Always called, regardless whether the Federated Protocol or Social
+// API is enabled.
+func (f *federator) GetOutbox(ctx context.Context, r *http.Request) (vocab.ActivityStreamsOrderedCollectionPage, error) {
+	// IMPLEMENTATION NOTE: For GoToSocial, we serve outboxes and inboxes through
+	// the CLIENT API, not through the federation API, so we just do nothing here.
+	return nil, nil
+}
+
+// NewTransport returns a new Transport on behalf of a specific actor.
+//
+// The actorBoxIRI will be either the inbox or outbox of an actor who is
+// attempting to do the dereferencing or delivery. Any authentication
+// scheme applied on the request must be based on this actor. The
+// request must contain some sort of credential of the user, such as a
+// HTTP Signature.
+//
+// The gofedAgent passed in should be used by the Transport
+// implementation in the User-Agent, as well as the application-specific
+// user agent string. The gofedAgent will indicate this library's use as
+// well as the library's version number.
+//
+// Any server-wide rate-limiting that needs to occur should happen in a
+// Transport implementation. This factory function allows this to be
+// created, so peer servers are not DOS'd.
+//
+// Any retry logic should also be handled by the Transport
+// implementation.
+//
+// Note that the library will not maintain a long-lived pointer to the
+// returned Transport so that any private credentials are able to be
+// garbage collected.
+func (f *federator) NewTransport(ctx context.Context, actorBoxIRI *url.URL, gofedAgent string) (pub.Transport, error) {
+
+	var username string
+	var err error
+
+	if util.IsInboxPath(actorBoxIRI) {
+		username, err = util.ParseInboxPath(actorBoxIRI)
+		if err != nil {
+			return nil, fmt.Errorf("couldn't parse path %s as an inbox: %s", actorBoxIRI.String(), err)
+		}
+	} else if util.IsOutboxPath(actorBoxIRI) {
+		username, err = util.ParseOutboxPath(actorBoxIRI)
+		if err != nil {
+			return nil, fmt.Errorf("couldn't parse path %s as an outbox: %s", actorBoxIRI.String(), err)
+		}
+	} else {
+		return nil, fmt.Errorf("id %s was neither an inbox path nor an outbox path", actorBoxIRI.String())
+	}
+
+	account := &gtsmodel.Account{}
+	if err := f.db.GetLocalAccountByUsername(username, account); err != nil {
+		return nil, fmt.Errorf("error getting account with username %s from the db: %s", username, err)
+	}
+
+	return f.transportController.NewTransport(account.PublicKeyURI, account.PrivateKey)
+}