GoToSocial/internal/federation/dereferencing/handshake.go

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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 (
"net/url"
)
func (d *Dereferencer) Handshaking(username string, remoteAccountID *url.URL) bool {
d.handshakesMu.Lock()
defer d.handshakesMu.Unlock()
if d.handshakes == nil {
// Handshakes isn't even initialized yet,
// so we can't be handshaking with anyone.
return false
}
remoteIDs, ok := d.handshakes[username]
if !ok {
// Given username isn't
// handshaking with anyone.
return false
}
for _, id := range remoteIDs {
if id.String() == remoteAccountID.String() {
// We are currently handshaking
// with the remote account.
return true
}
}
// No results: we're not handshaking
// with the remote account.
return false
}
func (d *Dereferencer) startHandshake(username string, remoteAccountID *url.URL) {
d.handshakesMu.Lock()
defer d.handshakesMu.Unlock()
remoteIDs, ok := d.handshakes[username]
if !ok {
// No handshakes were stored yet,
// so just add this entry and return.
d.handshakes[username] = []*url.URL{remoteAccountID}
return
}
// Add the remote account ID to the slice.
remoteIDs = append(remoteIDs, remoteAccountID)
d.handshakes[username] = remoteIDs
}
func (d *Dereferencer) stopHandshake(username string, remoteAccountID *url.URL) {
d.handshakesMu.Lock()
defer d.handshakesMu.Unlock()
remoteIDs, ok := d.handshakes[username]
if !ok {
// No handshake was in progress,
// so there's nothing to stop.
return
}
// Generate a new remoteIDs slice that
// doesn't contain the removed entry.
var (
remoteAccountIDStr = remoteAccountID.String()
newRemoteIDs = make([]*url.URL, 0, len(remoteIDs)-1)
)
for _, id := range remoteIDs {
if id.String() != remoteAccountIDStr {
newRemoteIDs = append(newRemoteIDs, id)
}
}
if len(newRemoteIDs) == 0 {
// There are no handshakes remaining,
// so just remove this username's slice
// from the map and save a few bytes.
delete(d.handshakes, username)
} else {
// There are still other handshakes ongoing.
d.handshakes[username] = newRemoteIDs
}
}