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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local tostring, setmetatable = tostring, setmetatable;
local pairs, next= pairs, next;
local hosts = hosts;
local full_sessions = prosody.full_sessions;
local bare_sessions = prosody.bare_sessions;
local logger = require "util.logger";
local log = logger.init("sessionmanager");
local rm_load_roster = require "core.rostermanager".load_roster;
local config_get = require "core.configmanager".get;
local resourceprep = require "util.encodings".stringprep.resourceprep;
local nodeprep = require "util.encodings".stringprep.nodeprep;
local uuid_generate = require "util.uuid".generate;
local initialize_filters = require "util.filters".initialize;
local gettime = require "socket".gettime;
local _ENV = nil;
local function new_session(conn)
local session = { conn = conn, type = "c2s_unauthed", conntime = gettime() };
local filter = initialize_filters(session);
local w = conn.write;
session.send = function (t)
if t.name then
t = filter("stanzas/out", t);
end
if t then
t = filter("bytes/out", tostring(t));
if t then
local ret, err = w(conn, t);
if not ret then
session.log("debug", "Error writing to connection: %s", tostring(err));
return false, err;
end
end
end
return true;
end
session.ip = conn:ip();
local conn_name = "c2s"..tostring(session):match("[a-f0-9]+$");
session.log = logger.init(conn_name);
return session;
end
local resting_session = { -- Resting, not dead
destroyed = true;
type = "c2s_destroyed";
close = function (session)
session.log("debug", "Attempt to close already-closed session");
end;
filter = function (type, data) return data; end; --luacheck: ignore 212/type
}; resting_session.__index = resting_session;
local function retire_session(session)
local log = session.log or log; --luacheck: ignore 431/log
for k in pairs(session) do
if k ~= "log" and k ~= "id" then
session[k] = nil;
end
end
function session.send(data) log("debug", "Discarding data sent to resting session: %s", tostring(data)); return false; end
function session.data(data) log("debug", "Discarding data received from resting session: %s", tostring(data)); end
return setmetatable(session, resting_session);
end
local function destroy_session(session, err)
(session.log or log)("debug", "Destroying session for %s (%s@%s)%s",
session.full_jid or "(unknown)", session.username or "(unknown)",
session.host or "(unknown)", err and (": "..err) or "");
if session.destroyed then return; end
-- Remove session/resource from user's session list
if session.full_jid then
local host_session = hosts[session.host];
-- Allow plugins to prevent session destruction
if host_session.events.fire_event("pre-resource-unbind", {session=session, error=err}) then
return;
end
host_session.sessions[session.username].sessions[session.resource] = nil;
full_sessions[session.full_jid] = nil;
if not next(host_session.sessions[session.username].sessions) then
log("debug", "All resources of %s are now offline", session.username);
host_session.sessions[session.username] = nil;
bare_sessions[session.username..'@'..session.host] = nil;
end
host_session.events.fire_event("resource-unbind", {session=session, error=err});
end
retire_session(session);
end
local function make_authenticated(session, username)
username = nodeprep(username);
if not username or #username == 0 then return nil, "Invalid username"; end
session.username = username;
if session.type == "c2s_unauthed" then
session.type = "c2s_unbound";
end
session.log("info", "Authenticated as %s@%s", username or "(unknown)", session.host or "(unknown)");
return true;
end
-- returns true, nil on success
-- returns nil, err_type, err, err_message on failure
local function bind_resource(session, resource)
if not session.username then return nil, "auth", "not-authorized", "Cannot bind resource before authentication"; end
if session.resource then return nil, "cancel", "not-allowed", "Cannot bind multiple resources on a single connection"; end
-- We don't support binding multiple resources
local event_payload = { session = session, resource = resource };
if hosts[session.host].events.fire_event("pre-resource-bind", event_payload) == false then
local err = event_payload.error;
if err then return nil, err.type, err.condition, err.text; end
return nil, "cancel", "not-allowed";
else
-- In case a plugin wants to poke at it
resource = event_payload.resource;
end
resource = resourceprep(resource);
resource = resource ~= "" and resource or uuid_generate();
--FIXME: Randomly-generated resources must be unique per-user, and never conflict with existing
if not hosts[session.host].sessions[session.username] then
local sessions = { sessions = {} };
hosts[session.host].sessions[session.username] = sessions;
bare_sessions[session.username..'@'..session.host] = sessions;
else
local sessions = hosts[session.host].sessions[session.username].sessions;
if sessions[resource] then
-- Resource conflict
local policy = config_get(session.host, "conflict_resolve");
local increment;
if policy == "random" then
resource = uuid_generate();
increment = true;
elseif policy == "increment" then
increment = true; -- TODO ping old resource
elseif policy == "kick_new" then
return nil, "cancel", "conflict", "Resource already exists";
else -- if policy == "kick_old" then
sessions[resource]:close {
condition = "conflict";
text = "Replaced by new connection";
};
if not next(sessions) then
hosts[session.host].sessions[session.username] = { sessions = sessions };
bare_sessions[session.username.."@"..session.host] = hosts[session.host].sessions[session.username];
end
end
if increment and sessions[resource] then
local count = 1;
while sessions[resource.."#"..count] do
count = count + 1;
end
resource = resource.."#"..count;
end
end
end
session.resource = resource;
session.full_jid = session.username .. '@' .. session.host .. '/' .. resource;
hosts[session.host].sessions[session.username].sessions[resource] = session;
full_sessions[session.full_jid] = session;
if session.type == "c2s_unbound" then
session.type = "c2s";
end
local err;
session.roster, err = rm_load_roster(session.username, session.host);
if err then
full_sessions[session.full_jid] = nil;
hosts[session.host].sessions[session.username].sessions[resource] = nil;
session.full_jid = nil;
session.resource = nil;
if next(bare_sessions[session.username..'@'..session.host].sessions) == nil then
bare_sessions[session.username..'@'..session.host] = nil;
hosts[session.host].sessions[session.username] = nil;
end
session.log("error", "Roster loading failed: %s", err);
return nil, "cancel", "internal-server-error", "Error loading roster";
end
hosts[session.host].events.fire_event("resource-bind", {session=session});
return true;
end
local function send_to_available_resources(username, host, stanza)
local jid = username.."@"..host;
local count = 0;
local user = bare_sessions[jid];
if user then
for _, session in pairs(user.sessions) do
if session.presence then
session.send(stanza);
count = count + 1;
end
end
end
return count;
end
local function send_to_interested_resources(username, host, stanza)
local jid = username.."@"..host;
local count = 0;
local user = bare_sessions[jid];
if user then
for _, session in pairs(user.sessions) do
if session.interested then
session.send(stanza);
count = count + 1;
end
end
end
return count;
end
return {
new_session = new_session;
retire_session = retire_session;
destroy_session = destroy_session;
make_authenticated = make_authenticated;
bind_resource = bind_resource;
send_to_available_resources = send_to_available_resources;
send_to_interested_resources = send_to_interested_resources;
};
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