Add very initial ChanServ and NickServ virtual clients

As well, add channel registration and re-applying founder privs on the first client joining the channel. I'm going to re-architect our modes system to better acocunt for this sort of change.

irc/chanserv.go

@@ -0,0 +1,119 @@
+// Copyright (c) 2017 Daniel Oaks <daniel@danieloaks.net>
+// released under the MIT license
+
+package irc
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/DanielOaks/girc-go/ircmsg"
+	"github.com/tidwall/buntdb"
+)
+
+// csHandler handles the /CS and /CHANSERV commands
+func csHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
+	server.chanservReceivePrivmsg(client, strings.Join(msg.Params, " "))
+	return false
+}
+
+func (server *Server) chanservReceiveNotice(client *Client, message string) {
+	// do nothing
+}
+
+// ChanServNotice sends the client a notice from ChanServ.
+func (client *Client) ChanServNotice(text string) {
+	client.Send(nil, fmt.Sprintf("ChanServ!services@%s", client.server.name), "NOTICE", client.nick, text)
+}
+
+func (server *Server) chanservReceivePrivmsg(client *Client, message string) {
+	var params []string
+	for _, p := range strings.Split(message, " ") {
+		if len(p) > 0 {
+			params = append(params, p)
+		}
+	}
+	if len(params) < 1 {
+		client.ChanServNotice("You need to run a command")
+		//TODO(dan): dump CS help here
+		return
+	}
+
+	command := strings.ToLower(params[0])
+	server.logger.Debug("chanserv", fmt.Sprintf("Client %s ran command %s", client.nick, command))
+
+	if command == "register" {
+		if len(params) < 2 {
+			client.ChanServNotice("Syntax: REGISTER <channel>")
+			return
+		}
+
+		server.registeredChannelsMutex.Lock()
+		defer server.registeredChannelsMutex.Unlock()
+
+		channelName := params[1]
+		channelKey, err := CasefoldChannel(channelName)
+		if err != nil {
+			client.ChanServNotice("Channel name is not valid")
+			return
+		}
+
+		channelInfo := server.channels.Get(channelKey)
+		if channelInfo == nil {
+			client.ChanServNotice("You must be an oper on the channel to register it")
+			return
+		}
+
+		if !channelInfo.ClientIsAtLeast(client, ChannelOperator) {
+			client.ChanServNotice("You must be an oper on the channel to register it")
+			return
+		}
+
+		server.store.Update(func(tx *buntdb.Tx) error {
+			currentChan := server.loadChannelNoMutex(tx, channelKey)
+			if currentChan != nil {
+				client.ChanServNotice("Channel is already registered")
+				return nil
+			}
+
+			account := client.account
+			if account == nil {
+				client.ChanServNotice("You must be logged in to register a channel")
+				return nil
+			}
+
+			chanRegInfo := RegisteredChannel{
+				Name:         channelName,
+				RegisteredAt: time.Now(),
+				Founder:      account.Name,
+				Topic:        channelInfo.topic,
+				TopicSetBy:   channelInfo.topicSetBy,
+				TopicSetTime: channelInfo.topicSetTime,
+			}
+			server.saveChannelNoMutex(tx, channelKey, chanRegInfo)
+
+			client.ChanServNotice(fmt.Sprintf("Channel %s successfully registered", channelName))
+
+			server.logger.Info("chanserv", fmt.Sprintf("Client %s registered channel %s", client.nick, channelName))
+
+			channelInfo.membersMutex.Lock()
+			defer channelInfo.membersMutex.Unlock()
+
+			// give them founder privs
+			change := channelInfo.applyModeMemberNoMutex(client, ChannelFounder, Add, client.nickCasefolded)
+			if change != nil {
+				//TODO(dan): we should change the name of String and make it return a slice here
+				//TODO(dan): unify this code with code in modes.go
+				args := append([]string{channelName}, strings.Split(change.String(), " ")...)
+				for member := range channelInfo.members {
+					member.Send(nil, fmt.Sprintf("ChanServ!services@%s", client.server.name), "MODE", args...)
+				}
+			}
+
+			return nil
+		})
+	} else {
+		client.ChanServNotice("Sorry, I don't know that command")
+	}
+}