Fix and add things

* Fix user ID reservation in registration
* Fix some database things
* Add commands
* Add basic contact syncing and portal creation
* Add better error logging

commands.go

@@ -0,0 +1,104 @@
+// mautrix-whatsapp - A Matrix-WhatsApp puppeting bridge.
+// Copyright (C) 2018 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 main
+
+import (
+	"maunium.net/go/mautrix-whatsapp/types"
+	"strings"
+	"maunium.net/go/mautrix-appservice"
+	"maunium.net/go/maulogger"
+)
+
+type CommandHandler struct {
+	bridge *Bridge
+	log    maulogger.Logger
+}
+
+func NewCommandHandler(bridge *Bridge) *CommandHandler {
+	return &CommandHandler{
+		bridge: bridge,
+		log:    bridge.Log.Sub("Command handler"),
+	}
+}
+
+type CommandEvent struct {
+	Bot     *appservice.IntentAPI
+	Bridge  *Bridge
+	Handler *CommandHandler
+	RoomID  types.MatrixRoomID
+	User    *User
+	Args    []string
+}
+
+func (ce *CommandEvent) Reply(msg string) {
+	_, err := ce.Bot.SendNotice(string(ce.RoomID), msg)
+	if err != nil {
+		ce.Handler.log.Warnfln("Failed to reply to command from %s: %v", ce.User.ID, err)
+	}
+}
+
+func (handler *CommandHandler) Handle(roomID types.MatrixRoomID, user *User, message string) {
+	args := strings.Split(message, " ")
+	cmd := strings.ToLower(args[0])
+	ce := &CommandEvent{
+		Bot:     handler.bridge.AppService.BotIntent(),
+		Bridge:  handler.bridge,
+		Handler: handler,
+		RoomID:  roomID,
+		User:    user,
+		Args:    args[1:],
+	}
+	switch cmd {
+	case "login":
+		handler.CommandLogin(ce)
+	case "logout":
+		handler.CommandLogout(ce)
+	case "help":
+		handler.CommandHelp(ce)
+	}
+}
+
+func (handler *CommandHandler) CommandLogin(ce *CommandEvent) {
+	if ce.User.Session != nil {
+		ce.Reply("You're already logged in.")
+		return
+	}
+
+	ce.User.Connect(true)
+	ce.User.Login(ce.RoomID)
+}
+
+func (handler *CommandHandler) CommandLogout(ce *CommandEvent) {
+	if ce.User.Session == nil {
+		ce.Reply("You're not logged in.")
+		return
+	}
+	err := ce.User.Conn.Logout()
+	if err != nil {
+		ce.User.log.Warnln("Error while logging out:", err)
+		ce.Reply("Error while logging out (see logs for details)")
+		return
+	}
+	ce.User.Conn = nil
+	ce.User.Session = nil
+	ce.User.Update()
+	ce.Reply("Logged out successfully.")
+}
+
+func (handler *CommandHandler) CommandHelp(ce *CommandEvent) {
+	ce.Reply("Help is not yet implemented 3:")
+}