Support cap-notify and enabling/disabling SASL

CHANGELOG.md

@@ -12,6 +12,8 @@ New release of Oragono!
 
 ### Added
 * Added `REHASH` command.
+* Added ability to enable and disable SASL.
+* Added support for IRCv3 capability [`cap-notify`](http://ircv3.net/specs/extensions/cap-notify-3.2.html).
 
 ### Changed
 

irc/accounts.go

@@ -78,7 +78,7 @@ func loadAccount(server *Server, tx *buntdb.Tx, accountKey string) *ClientAccoun
 // authenticateHandler parses the AUTHENTICATE command (for SASL authentication).
 func authenticateHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
 	// sasl abort
-	if len(msg.Params) == 1 && msg.Params[0] == "*" {
+	if !server.authenticationEnabled || len(msg.Params) == 1 && msg.Params[0] == "*" {
 		if client.saslInProgress {
 			client.Send(nil, server.name, ERR_SASLABORTED, client.nick, "SASL authentication aborted")
 		} else {

irc/capability.go

@@ -17,6 +17,7 @@ const (
 	AccountTag      Capability = "account-tag"
 	AccountNotify   Capability = "account-notify"
 	AwayNotify      Capability = "away-notify"
+	CapNotify       Capability = "cap-notify"
 	ExtendedJoin    Capability = "extended-join"
 	InviteNotify    Capability = "invite-notify"
 	MessageTags     Capability = "draft/message-tags"
@@ -31,11 +32,12 @@ var (
 		AccountTag:    true,
 		AccountNotify: true,
 		AwayNotify:    true,
+		CapNotify:     true,
 		ExtendedJoin:  true,
 		InviteNotify:  true,
 		MessageTags:   true,
 		MultiPrefix:   true,
-		SASL:            true,
+		// SASL is set during server startup
 		ServerTime:      true,
 		UserhostInNames: true,
 	}

irc/client_lookup_set.go

@@ -82,6 +82,24 @@ func (clients *ClientLookupSet) Remove(client *Client) error {
 	return nil
 }
 
+func (clients *ClientLookupSet) AllWithCaps(caps ...Capability) (set ClientSet) {
+	set = make(ClientSet)
+
+	var client *Client
+	for _, client = range clients.ByNick {
+		// make sure they have all the required caps
+		for _, Cap := range caps {
+			if !client.capabilities[Cap] {
+				continue
+			}
+		}
+
+		set.Add(client)
+	}
+
+	return set
+}
+
 func (clients *ClientLookupSet) FindAll(userhost string) (set ClientSet) {
 	set = make(ClientSet)
 

irc/config.go

@@ -86,6 +86,8 @@ type Config struct {
 		Path string
 	}
 
+	AuthenticationEnabled bool `yaml:"authentication-enabled"`
+
 	Registration struct {
 		Accounts AccountRegistrationConfig
 	}

irc/server.go

@@ -60,6 +60,7 @@ type ListenerEvent struct {
 // Server is the main Oragono server.
 type Server struct {
 	accounts              map[string]*ClientAccount
+	authenticationEnabled bool
 	channels              ChannelNameMap
 	clients               *ClientLookupSet
 	commands              chan Command
@@ -110,8 +111,13 @@ func NewServer(configFilename string, config *Config) *Server {
 		return nil
 	}
 
+	if config.AuthenticationEnabled {
+		SupportedCapabilities[SASL] = true
+	}
+
 	server := &Server{
 		accounts:              make(map[string]*ClientAccount),
+		authenticationEnabled: config.AuthenticationEnabled,
 		channels:              make(ChannelNameMap),
 		clients:               NewClientLookupSet(),
 		commands:              make(chan Command),
@@ -894,7 +900,45 @@ func (server *Server) rehash() error {
 		return fmt.Errorf("Error rehashing config file: %s", err.Error())
 	}
 
-	//TODO(dan): burst CAP DEL for sasl
+	// setup new and removed caps
+	addedCaps := make(CapabilitySet)
+	removedCaps := make(CapabilitySet)
+
+	// SASL
+	if config.AuthenticationEnabled && !server.authenticationEnabled {
+		// enabling SASL
+		SupportedCapabilities[SASL] = true
+		addedCaps[SASL] = true
+	}
+	if !config.AuthenticationEnabled && server.authenticationEnabled {
+		// disabling SASL
+		SupportedCapabilities[SASL] = false
+		removedCaps[SASL] = true
+	}
+	server.authenticationEnabled = config.AuthenticationEnabled
+
+	// burst new and removed caps
+	var capBurstClients ClientSet
+	added := make(map[CapVersion]string)
+	var removed string
+
+	if len(addedCaps) > 0 || len(removedCaps) > 0 {
+		capBurstClients = server.clients.AllWithCaps(CapNotify)
+
+		added[Cap301] = addedCaps.String(Cap301)
+		added[Cap302] = addedCaps.String(Cap302)
+		// removed never has values
+		removed = removedCaps.String(Cap301)
+	}
+
+	for sClient := range capBurstClients {
+		if len(addedCaps) > 0 {
+			sClient.Send(nil, server.name, "CAP", sClient.nick, "NEW", added[sClient.capVersion])
+		}
+		if len(removedCaps) > 0 {
+			sClient.Send(nil, server.name, "CAP", sClient.nick, "DEL", removed)
+		}
+	}
 
 	// set server options
 	server.limits = Limits{

oragono.yaml

@@ -41,6 +41,9 @@ server:
     # if you change the motd, you should move it to ircd.motd
     motd: oragono.motd
 
+# whether account authentication is enabled
+authentication-enabled: true
+
 # account/channel registration
 registration:
     # account registration