Add initial WhatsApp support (#711)

vendor/maunium.net/go/mautrix-whatsapp/whatsapp-ext/presence.go

@@ -0,0 +1,67 @@
+// mautrix-whatsapp - A Matrix-WhatsApp puppeting bridge.
+// Copyright (C) 2019 Tulir Asokan
+//
+// 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 <https://www.gnu.org/licenses/>.
+
+package whatsappExt
+
+import (
+	"encoding/json"
+	"strings"
+
+	"github.com/Rhymen/go-whatsapp"
+)
+
+type PresenceType string
+
+const (
+	PresenceUnavailable PresenceType = "unavailable"
+	PresenceAvailable   PresenceType = "available"
+	PresenceComposing   PresenceType = "composing"
+)
+
+type Presence struct {
+	JID       string       `json:"id"`
+	SenderJID string       `json:"participant"`
+	Status    PresenceType `json:"type"`
+	Timestamp int64        `json:"t"`
+	Deny      bool         `json:"deny"`
+}
+
+type PresenceHandler interface {
+	whatsapp.Handler
+	HandlePresence(Presence)
+}
+
+func (ext *ExtendedConn) handleMessagePresence(message []byte) {
+	var event Presence
+	err := json.Unmarshal(message, &event)
+	if err != nil {
+		ext.jsonParseError(err)
+		return
+	}
+	event.JID = strings.Replace(event.JID, OldUserSuffix, NewUserSuffix, 1)
+	if len(event.SenderJID) == 0 {
+		event.SenderJID = event.JID
+	} else {
+		event.SenderJID = strings.Replace(event.SenderJID, OldUserSuffix, NewUserSuffix, 1)
+	}
+	for _, handler := range ext.handlers {
+		presenceHandler, ok := handler.(PresenceHandler)
+		if !ok {
+			continue
+		}
+		go presenceHandler.HandlePresence(event)
+	}
+}