accounts: Add account-tag capability

CHANGELOG.md

@@ -21,7 +21,7 @@ Initial release of Oragono!
 * Added ability to parse complex mode change syntax commonly used these days (i.e. `+h-ov dan dan dan`).
 * Added user mode for clients connected via TLS (`+Z`).
 * Added ability to register and login to accounts (with passphrase or certfp).
-* Added support for IRCv3 capabilities [`extended-join`](http://ircv3.net/specs/extensions/extended-join-3.1.html), [`sasl`](http://ircv3.net/specs/extensions/sasl-3.1.html), [`server-time`](http://ircv3.net/specs/extensions/server-time-3.2.html), and [`userhost-in-names`](http://ircv3.net/specs/extensions/userhost-in-names-3.2.html).
+* Added support for IRCv3 capabilities [`account-tag`](http://ircv3.net/specs/extensions/account-tag-3.2.html), [`extended-join`](http://ircv3.net/specs/extensions/extended-join-3.1.html), [`sasl`](http://ircv3.net/specs/extensions/sasl-3.1.html), [`server-time`](http://ircv3.net/specs/extensions/server-time-3.2.html), and [`userhost-in-names`](http://ircv3.net/specs/extensions/userhost-in-names-3.2.html).
 
 ### Changed
 * Changed channel creator (`O`) privilege to founder/admin/halfops (`qah`) privileges.

irc/capability.go

@@ -14,6 +14,7 @@ import (
 type Capability string
 
 const (
+	AccountTag      Capability = "account-tag"
 	ExtendedJoin    Capability = "extended-join"
 	MultiPrefix     Capability = "multi-prefix"
 	SASL            Capability = "sasl"
@@ -23,6 +24,7 @@ const (
 
 var (
 	SupportedCapabilities = CapabilitySet{
+		AccountTag:      true,
 		ExtendedJoin:    true,
 		MultiPrefix:     true,
 		SASL:            true,

irc/channel.go

@@ -304,8 +304,7 @@ func (channel *Channel) PrivMsg(client *Client, message string) {
 		if member == client {
 			continue
 		}
-		//TODO(dan): use nickmask instead of nickString here lel
-		member.Send(nil, client.nickMaskString, "PRIVMSG", channel.nameString, message)
+		member.SendFromClient(client, nil, client.nickMaskString, "PRIVMSG", channel.nameString, message)
 	}
 }
 
@@ -452,7 +451,7 @@ func (channel *Channel) Notice(client *Client, message string) {
 		if member == client {
 			continue
 		}
-		member.Send(nil, client.nickMaskString, "NOTICE", channel.nameString, message)
+		member.SendFromClient(client, nil, client.nickMaskString, "NOTICE", channel.nameString, message)
 	}
 }
 

irc/client.go

@@ -349,6 +349,21 @@ func (client *Client) destroy() {
 	}
 }
 
+// SendFromClient sends an IRC line coming from a specific client.
+// Adds account-tag to the line as well.
+func (client *Client) SendFromClient(from *Client, tags *map[string]ircmsg.TagValue, prefix string, command string, params ...string) error {
+	// attach account-tag
+	if client.capabilities[AccountTag] && from.account != &NoAccount {
+		if tags == nil {
+			tags = ircmsg.MakeTags("account", from.account.Name)
+		} else {
+			(*tags)["account"] = ircmsg.MakeTagValue(from.account.Name)
+		}
+	}
+
+	return client.Send(tags, prefix, command, params...)
+}
+
 // Send sends an IRC line to the client.
 func (client *Client) Send(tags *map[string]ircmsg.TagValue, prefix string, command string, params ...string) error {
 	// attach server-time