488 lines
16 KiB
Lua
488 lines
16 KiB
Lua
local bare = require "util.jid".bare;
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local generate_uuid = require "util.uuid".generate;
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local jid = require "util.jid";
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local neturl = require "net.url";
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local parse = neturl.parseQuery;
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local st = require "util.stanza";
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local get_room_from_jid = module:require "util".get_room_from_jid;
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local wrap_async_run = module:require "util".wrap_async_run;
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local timer = require "util.timer";
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-- Options
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local poltergeist_component
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= module:get_option_string("poltergeist_component", module.host);
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-- defaults to 3 min
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local poltergeist_timeout
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= module:get_option_string("poltergeist_leave_timeout", 180);
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-- this basically strips the domain from the conference.domain address
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local parentHostName = string.gmatch(tostring(module.host), "%w+.(%w.+)")();
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if parentHostName == nil then
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log("error", "Failed to start - unable to get parent hostname");
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return;
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end
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local parentCtx = module:context(parentHostName);
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if parentCtx == nil then
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log("error",
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"Failed to start - unable to get parent context for host: %s",
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tostring(parentHostName));
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return;
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end
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local token_util = module:require "token/util".new(parentCtx);
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-- option to enable/disable token verifications
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local disableTokenVerification
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= module:get_option_boolean("disable_polergeist_token_verification", false);
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-- option to expire poltergeist with custom status text
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local poltergeistExpiredStatus
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= module:get_option_string("poltergeist_expired_status");
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-- table to store all poltergeists we create
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local poltergeists = {};
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-- table to mark that outgoing unavailable presences
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-- should be marked with ignore
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local poltergeists_pr_ignore = {};
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-- poltergaist management functions
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-- Returns the room if available, work and in multidomain mode
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-- @param room_name the name of the room
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-- @param group name of the group (optional)
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-- @return returns room if found or nil
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function get_room(room_name, group)
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local room_address = jid.join(room_name, module:get_host());
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-- if there is a group we are in multidomain mode and that group is not
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-- our parent host
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if group and group ~= "" and group ~= parentHostName then
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room_address = "["..group.."]"..room_address;
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end
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return get_room_from_jid(room_address);
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end
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-- Stores the username in the table where we store poltergeist usernames
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-- based on their room names
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-- @param room the room instance
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-- @param user_id the user id
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-- @param username the username to store
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function store_username(room, user_id, username)
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local room_name = jid.node(room.jid);
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-- we store in poltergeist user ids for room names
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if (not poltergeists[room_name]) then
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poltergeists[room_name] = {};
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end
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poltergeists[room_name][user_id] = username;
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log("debug", "stored in session: %s", username);
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end
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-- Retrieve the username for a user
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-- @param room the room instance
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-- @param user_id the user id
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-- @return returns the stored username for user or nil
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function get_username(room, user_id)
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local room_name = jid.node(room.jid);
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if (not poltergeists[room_name]) then
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return nil;
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end
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return poltergeists[room_name][user_id];
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end
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-- Removes poltergeist values from table
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-- @param room the room instance
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-- @param nick the user nick
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function remove_username(room, nick)
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local room_name = jid.node(room.jid);
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if (poltergeists[room_name]) then
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local user_id_to_remove;
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for name,username in pairs(poltergeists[room_name]) do
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if (string.sub(username, 0, 8) == nick) then
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user_id_to_remove = name;
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end
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end
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if (user_id_to_remove) then
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poltergeists[room_name][user_id_to_remove] = nil;
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end
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end
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end
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--- Verifies room name, domain name with the values in the token
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-- @param token the token we received
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-- @param room_name the room name
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-- @param group name of the group (optional)
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-- @return true if values are ok or false otherwise
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function verify_token(token, room_name, group)
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if disableTokenVerification then
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return true;
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end
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-- if not disableTokenVerification and we do not have token
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-- stop here, cause the main virtual host can have guest access enabled
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-- (allowEmptyToken = true) and we will allow access to rooms info without
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-- a token
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if token == nil then
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log("warn", "no token provided");
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return false;
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end
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local session = {};
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session.auth_token = token;
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local verified, reason = token_util:process_and_verify_token(session);
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if not verified then
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log("warn", "not a valid token %s", tostring(reason));
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return false;
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end
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local room_address = jid.join(room_name, module:get_host());
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-- if there is a group we are in multidomain mode and that group is not
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-- our parent host
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if group and group ~= "" and group ~= parentHostName then
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room_address = "["..group.."]"..room_address;
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end
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if not token_util:verify_room(session, room_address) then
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log("warn", "Token %s not allowed to join: %s",
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tostring(token), tostring(room_address));
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return false;
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end
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return true;
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end
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-- if we found that a session for a user with id has a poltergiest already
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-- created, retrieve its jid and return it to the authentication
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-- so we can reuse it and we that real user will replace the poltergiest
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prosody.events.add_handler("pre-jitsi-authentication", function(session)
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if (session.jitsi_meet_context_user) then
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local room = get_room(
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session.jitsi_bosh_query_room,
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session.jitsi_meet_domain);
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if (not room) then
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return nil;
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end
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local username
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= get_username(room, session.jitsi_meet_context_user["id"]);
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if (not username) then
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return nil;
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end
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log("debug", "Found predefined username %s", username);
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-- let's find the room and if the poltergeist occupant is there
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-- lets remove him before the real participant joins
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-- when we see the unavailable presence to go out the server
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-- we will mark it with ignore tag
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local nick = string.sub(username, 0, 8);
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if (have_poltergeist_occupant(room, nick)) then
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remove_poltergeist_occupant(room, nick, true);
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end
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return username;
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end
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return nil;
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end);
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-- Creates poltergeist occupant
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-- @param room the room instance where we create the occupant
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-- @param nick the nick to use for the new occupant
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-- @param name the display name fot the occupant (optional)
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-- @param avatar the avatar to use for the new occupant (optional)
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-- @param status the initial status to use for the new occupant (optional)
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function create_poltergeist_occupant(room, nick, name, avatar, status)
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log("debug", "create_poltergeist_occupant %s:", nick);
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-- Join poltergeist occupant to room, with the invited JID as their nick
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local join_presence = st.presence({
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to = room.jid.."/"..nick,
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from = poltergeist_component.."/"..nick
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}):tag("x", { xmlns = "http://jabber.org/protocol/muc" }):up();
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if (name) then
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join_presence:tag(
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"nick",
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{ xmlns = "http://jabber.org/protocol/nick" }):text(name):up();
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end
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if (avatar) then
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join_presence:tag("avatar-url"):text(avatar):up();
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end
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if (status) then
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join_presence:tag("status"):text(status):up();
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end
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room:handle_first_presence(
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prosody.hosts[poltergeist_component], join_presence);
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local timeout = poltergeist_timeout;
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-- the timeout before removing so participants can see the status update
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local removeTimeout = 5;
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if (poltergeistExpiredStatus) then
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timeout = timeout - removeTimeout;
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end
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timer.add_task(timeout,
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function ()
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if (poltergeistExpiredStatus) then
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update_poltergeist_occupant_status(
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room, nick, poltergeistExpiredStatus);
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-- and remove it after some time so participant can see
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-- the update
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timer.add_task(removeTimeout,
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function ()
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if (have_poltergeist_occupant(room, nick)) then
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remove_poltergeist_occupant(room, nick, false);
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end
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end);
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else
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if (have_poltergeist_occupant(room, nick)) then
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remove_poltergeist_occupant(room, nick, false);
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end
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end
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end);
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end
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-- Removes poltergeist occupant
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-- @param room the room instance where to remove the occupant
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-- @param nick the nick of the occupant to remove
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-- @param ignore to mark the poltergeist unavailble presence to be ignored
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function remove_poltergeist_occupant(room, nick, ignore)
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log("debug", "remove_poltergeist_occupant %s", nick);
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local leave_presence = st.presence({
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to = room.jid.."/"..nick,
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from = poltergeist_component.."/"..nick,
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type = "unavailable" });
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if (ignore) then
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poltergeists_pr_ignore[room.jid.."/"..nick] = true;
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end
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room:handle_normal_presence(
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prosody.hosts[poltergeist_component], leave_presence);
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remove_username(room, nick);
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end
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-- Updates poltergeist occupant status
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-- @param room the room instance where to remove the occupant
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-- @param nick the nick of the occupant to remove
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-- @param status the status to update
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function update_poltergeist_occupant_status(room, nick, status)
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local update_presence = get_presence(room, nick);
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if (not update_presence) then
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-- no presence found for occupant, create one
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update_presence = st.presence({
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to = room.jid.."/"..nick,
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from = poltergeist_component.."/"..nick
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});
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else
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-- update occupant presence with appropriate to and from
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-- so we can send it again
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update_presence = st.clone(update_presence);
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update_presence.attr.to = room.jid.."/"..nick;
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update_presence.attr.from = poltergeist_component.."/"..nick;
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end
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local once = false;
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-- the status tag we will attach
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local statusTag = st.stanza("status"):text(status);
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-- if there is already a status tag replace it
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update_presence:maptags(function (tag)
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if tag.name == statusTag.name then
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if not once then
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once = true;
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return statusTag;
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else
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return nil;
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end
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end
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return tag;
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end);
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if (not once) then
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-- no status tag was repleced, attach it
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update_presence:add_child(statusTag);
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end
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room:handle_normal_presence(
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prosody.hosts[poltergeist_component], update_presence);
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end
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-- Checks for existance of a poltergeist occupant
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-- @param room the room instance where to check for occupant
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-- @param nick the nick of the occupant
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-- @return true if occupant is found, false otherwise
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function have_poltergeist_occupant(room, nick)
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-- Find out if we have a poltergeist occupant in the room for this JID
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return not not room:get_occupant_jid(poltergeist_component.."/"..nick);
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end
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-- Returns the last presence of occupant
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-- @param room the room instance where to check for occupant
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-- @param nick the nick of the occupant
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-- @return presence of the occupant
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function get_presence(room, nick)
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local occupant_jid
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= room:get_occupant_jid(poltergeist_component.."/"..nick);
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if (occupant_jid) then
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return room:get_occupant_by_nick(occupant_jid):get_presence();
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end
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return nil;
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end
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-- Event handlers
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--- Note: mod_muc and some of its sub-modules add event handlers between 0 and -100,
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--- e.g. to check for banned users, etc.. Hence adding these handlers at priority -100.
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module:hook("muc-decline", function (event)
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remove_poltergeist_occupant(event.room, bare(event.stanza.attr.from), false);
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end, -100);
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-- before sending the presence for a poltergeist leaving add ignore tag
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-- as poltergeist is leaving just before the real user joins and in the client
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-- we ignore this presence to avoid leaving/joining experience and the real
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-- user will reuse all currently created UI components for the same nick
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module:hook("muc-broadcast-presence", function (event)
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if (bare(event.occupant.jid) == poltergeist_component) then
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if(event.stanza.attr.type == "unavailable"
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and poltergeists_pr_ignore[event.occupant.nick]) then
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event.stanza:tag(
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"ignore", { xmlns = "http://jitsi.org/jitmeet/" }):up();
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poltergeists_pr_ignore[event.occupant.nick] = nil;
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end
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end
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end, -100);
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-- cleanup room table after room is destroyed
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module:hook("muc-room-destroyed",function(event)
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local room_name = jid.node(event.room.jid);
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if (poltergeists[room_name]) then
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poltergeists[room_name] = nil;
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end
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end);
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--- Handles request for creating/managing poltergeists
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-- @param event the http event, holds the request query
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-- @return GET response, containing a json with response details
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function handle_create_poltergeist (event)
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if (not event.request.url.query) then
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return 400;
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end
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local params = parse(event.request.url.query);
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local user_id = params["user"];
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local room_name = params["room"];
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local group = params["group"];
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local name = params["name"];
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local avatar = params["avatar"];
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local status = params["status"];
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if not verify_token(params["token"], room_name, group) then
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return 403;
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end
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local room = get_room(room_name, group);
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if (not room) then
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log("error", "no room found %s", room_name);
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return 404;
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end
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local username = generate_uuid();
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store_username(room, user_id, username)
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create_poltergeist_occupant(
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room, string.sub(username,0,8), name, avatar, status);
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return 200;
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end
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--- Handles request for updating poltergeists status
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-- @param event the http event, holds the request query
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-- @return GET response, containing a json with response details
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function handle_update_poltergeist (event)
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if (not event.request.url.query) then
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return 400;
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end
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local params = parse(event.request.url.query);
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local user_id = params["user"];
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local room_name = params["room"];
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local group = params["group"];
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local status = params["status"];
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if not verify_token(params["token"], room_name, group) then
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return 403;
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end
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local room = get_room(room_name, group);
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if (not room) then
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log("error", "no room found %s", room_name);
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return 404;
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end
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local username = get_username(room, user_id);
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if (not username) then
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return 404;
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end
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local nick = string.sub(username, 0, 8);
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if (have_poltergeist_occupant(room, nick)) then
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update_poltergeist_occupant_status(room, nick, status);
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return 200;
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else
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return 404;
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end
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end
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--- Handles remove poltergeists
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-- @param event the http event, holds the request query
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-- @return GET response, containing a json with response details
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function handle_remove_poltergeist (event)
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if (not event.request.url.query) then
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return 400;
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end
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local params = parse(event.request.url.query);
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local user_id = params["user"];
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local room_name = params["room"];
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local group = params["group"];
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if not verify_token(params["token"], room_name, group) then
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return 403;
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end
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local room = get_room(room_name, group);
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if (not room) then
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log("error", "no room found %s", room_name);
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return 404;
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end
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local username = get_username(room, user_id);
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if (not username) then
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return 404;
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end
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local nick = string.sub(username, 0, 8);
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if (have_poltergeist_occupant(room, nick)) then
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remove_poltergeist_occupant(room, nick, false);
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return 200;
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else
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return 404;
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end
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end
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log("info", "Loading poltergeist service");
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module:depends("http");
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module:provides("http", {
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default_path = "/";
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name = "poltergeist";
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route = {
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["GET /poltergeist/create"] = function (event) return wrap_async_run(event,handle_create_poltergeist) end;
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["GET /poltergeist/update"] = function (event) return wrap_async_run(event,handle_update_poltergeist) end;
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["GET /poltergeist/remove"] = function (event) return wrap_async_run(event,handle_remove_poltergeist) end;
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};
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});
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