kike: implement INVITE

2 files changed, 76 insertions, 3 deletions

diff --git a/kike-replies b/kike-replies
index decc880..c5deec5 100644
--- a/kike-replies
+++ b/kike-replies
@@ -28,6 +28,7 @@
 331 IRC_RPL_NOTOPIC "%s :No topic is set"
 332 IRC_RPL_TOPIC "%s :%s"
 333 IRC_RPL_TOPICWHOTIME "%s %s %lld"
+341 IRC_RPL_INVITING "%s %s"
 346 IRC_RPL_INVITELIST "%s %s"
 347 IRC_RPL_ENDOFINVITELIST "%s :End of channel invite list"
 348 IRC_RPL_EXCEPTLIST "%s %s"
@@ -57,6 +58,7 @@
 433 IRC_ERR_NICKNAMEINUSE "%s :Nickname is already in use"
 441 IRC_ERR_USERNOTINCHANNEL "%s %s :They aren't on that channel"
 442 IRC_ERR_NOTONCHANNEL "%s :You're not on that channel"
+443 IRC_ERR_USERONCHANNEL "%s %s :is already on channel"
 445 IRC_ERR_SUMMONDISABLED ":SUMMON has been disabled"
 446 IRC_ERR_USERSDISABLED ":USERS has been disabled"
 451 IRC_ERR_NOTREGISTERED ":You have not registered"
diff --git a/kike.c b/kike.c
index 2ad92a0..538d0d3 100644
--- a/kike.c
+++ b/kike.c
@@ -327,6 +327,8 @@ struct client
 	unsigned mode;                      ///< User's mode
 	char *away_message;                 ///< Away message
 	time_t last_active;                 ///< Last PRIVMSG, to get idle time
+	// XXX: maybe this should rather be a str_map
+	struct str_vector invites;          ///< Channel invitations
 	struct flood_detector antiflood;    ///< Flood detector
 };
 
@@ -340,6 +342,7 @@ client_init (struct client *self)
 	str_init (&self->write_buffer);
 	// TODO: make this configurable and more fine-grained
 	flood_detector_init (&self->antiflood, 10, 20);
+	str_vector_init (&self->invites);
 }
 
 static void
@@ -361,6 +364,7 @@ client_free (struct client *self)
 	free (self->address);
 	free (self->away_message);
 	flood_detector_free (&self->antiflood);
+	str_vector_free (&self->invites);
 }
 
 static void client_close_link (struct client *, const char *);
@@ -2296,6 +2300,67 @@ irc_handle_kick (const struct irc_message *msg, struct client *c)
 	str_vector_free (&users);
 }
 
+static bool
+irc_is_invited (struct client *c, const char *channel_name)
+{
+	for (size_t i = 0; i < c->invites.len; i++)
+		if (!irc_strcmp (c->invites.vector[i], channel_name))
+			return true;
+	return false;
+}
+
+static void
+irc_handle_invite (const struct irc_message *msg, struct client *c)
+{
+	if (msg->params.len < 2)
+		RETURN_WITH_REPLY (c, IRC_ERR_NEEDMOREPARAMS, msg->command);
+
+	const char *target       = msg->params.vector[0];
+	const char *channel_name = msg->params.vector[1];
+
+	struct client *client = str_map_find (&c->ctx->users, target);
+	if (!client)
+		RETURN_WITH_REPLY (c, IRC_ERR_NOSUCHNICK, target);
+
+	struct channel *chan = str_map_find (&c->ctx->channels, channel_name);
+	if (chan)
+	{
+		struct channel_user *inviting_user;
+		if (!(inviting_user = channel_get_user (chan, c)))
+			RETURN_WITH_REPLY (c, IRC_ERR_NOTONCHANNEL, channel_name);
+		if (channel_get_user (chan, client))
+			RETURN_WITH_REPLY (c, IRC_ERR_USERONCHANNEL, target, channel_name);
+
+		if ((chan->modes & IRC_CHAN_MODE_INVITE_ONLY))
+		{
+			if (!(inviting_user->modes & IRC_CHAN_MODE_OPERATOR))
+				RETURN_WITH_REPLY (c, IRC_ERR_CHANOPRIVSNEEDED, channel_name);
+
+			// Only storing the invite if it makes sense
+			if (!irc_is_invited (client, channel_name))
+				str_vector_add (&client->invites, channel_name);
+		}
+	}
+
+	client_send (client, ":%s!%s@%s INVITE %s %s",
+		c->nickname, c->username, c->hostname, client->nickname, channel_name);
+	if (client->away_message)
+		irc_send_reply (c, IRC_RPL_AWAY,
+			client->nickname, client->away_message);
+	irc_send_reply (c, IRC_RPL_INVITING, client->nickname, channel_name);
+}
+
+static void
+irc_remove_invite (struct client *c, const char *channel_name)
+{
+	for (size_t i = 0; i < c->invites.len; i++)
+		if (!irc_strcmp (c->invites.vector[i], channel_name))
+		{
+			str_vector_remove (&c->invites, i);
+			return;
+		}
+}
+
 static void
 irc_try_join (struct client *c, const char *channel_name, const char *key)
 {
@@ -2311,9 +2376,10 @@ irc_try_join (struct client *c, const char *channel_name, const char *key)
 	else if (channel_get_user (chan, c))
 		return;
 
+	bool invited = irc_is_invited (c, channel_name);
 	if ((chan->modes & IRC_CHAN_MODE_INVITE_ONLY)
-	 && !client_in_mask_list (c, &chan->invite_list))
-		// TODO: exceptions caused by INVITE
+	 && !client_in_mask_list (c, &chan->invite_list)
+	 && !invited)
 		RETURN_WITH_REPLY (c, IRC_ERR_INVITEONLYCHAN, channel_name);
 	if (chan->key && (!key || strcmp (key, chan->key)))
 		RETURN_WITH_REPLY (c, IRC_ERR_BADCHANNELKEY, channel_name);
@@ -2321,9 +2387,13 @@ irc_try_join (struct client *c, const char *channel_name, const char *key)
 	 && channel_user_count (chan) >= (size_t) chan->user_limit)
 		RETURN_WITH_REPLY (c, IRC_ERR_CHANNELISFULL, channel_name);
 	if (client_in_mask_list (c, &chan->ban_list)
-	 && !client_in_mask_list (c, &chan->exception_list))
+	 && !client_in_mask_list (c, &chan->exception_list)
+	 && !invited)
 		RETURN_WITH_REPLY (c, IRC_ERR_BANNEDFROMCHAN, channel_name);
 
+	// Destroy any invitation as there's no other way to get rid of it
+	irc_remove_invite (c, channel_name);
+
 	channel_add_user (chan, c)->modes = user_mode;
 
 	char *message = xstrdup_printf (":%s!%s@%s JOIN %s",
@@ -2494,6 +2564,7 @@ irc_register_handlers (struct server_context *ctx)
 		{ "JOIN",     true,  irc_handle_join     },
 		{ "PART",     true,  irc_handle_part     },
 		{ "KICK",     true,  irc_handle_kick     },
+		{ "INVITE",   true,  irc_handle_invite   },
 		{ "TOPIC",    true,  irc_handle_topic    },
 		{ "LIST",     true,  irc_handle_list     },
 		{ "NAMES",    true,  irc_handle_names    },