1 files changed, 74 insertions, 0 deletions
diff --git a/internal/processing/federation/getfollowing.go b/internal/processing/federation/getfollowing.go
new file mode 100644
index 000000000..e2d50d238
--- /dev/null
+++ b/internal/processing/federation/getfollowing.go
@@ -0,0 +1,74 @@
+/*
+   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"
+	"errors"
+	"fmt"
+	"net/url"
+
+	"github.com/go-fed/activity/streams"
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+func (p *processor) GetFollowing(ctx context.Context, requestedUsername string, requestURL *url.URL) (interface{}, gtserror.WithCode) {
+	// get the account the request is referring to
+	requestedAccount, err := p.db.GetLocalAccountByUsername(ctx, requestedUsername)
+	if err != nil {
+		return nil, gtserror.NewErrorNotFound(fmt.Errorf("database error getting account with username %s: %s", requestedUsername, err))
+	}
+
+	// authenticate the request
+	requestingAccountURI, authenticated, err := p.federator.AuthenticateFederatedRequest(ctx, requestedUsername)
+	if err != nil || !authenticated {
+		return nil, gtserror.NewErrorNotAuthorized(errors.New("not authorized"), "not authorized")
+	}
+
+	requestingAccount, _, err := p.federator.GetRemoteAccount(ctx, requestedUsername, requestingAccountURI, false)
+	if err != nil {
+		return nil, gtserror.NewErrorNotAuthorized(err)
+	}
+
+	blocked, err := p.db.IsBlocked(ctx, requestedAccount.ID, requestingAccount.ID, true)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	if blocked {
+		return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("block exists between accounts %s and %s", requestedAccount.ID, requestingAccount.ID))
+	}
+
+	requestedAccountURI, err := url.Parse(requestedAccount.URI)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error parsing url %s: %s", requestedAccount.URI, err))
+	}
+
+	requestedFollowing, err := p.federator.FederatingDB().Following(ctx, requestedAccountURI)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(fmt.Errorf("error fetching following for uri %s: %s", requestedAccountURI.String(), err))
+	}
+
+	data, err := streams.Serialize(requestedFollowing)
+	if err != nil {
+		return nil, gtserror.NewErrorInternalError(err)
+	}
+
+	return data, nil
+}