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256 lines
8.5 KiB
256 lines
8.5 KiB
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local jid_bare = require "util.jid".bare;
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local jid_split = require "util.jid".split;
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local st = require "util.stanza";
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local hosts = hosts;
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local user_exists = require "core.usermanager".user_exists;
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local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
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local pairs, ipairs = pairs, ipairs;
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local next = next;
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local type = type;
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local calculate_hash = require "util.caps".calculate_hash;
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local NULL = {};
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local data = {};
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local recipients = {};
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local hash_map = {};
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module.save = function()
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return { data = data, recipients = recipients, hash_map = hash_map };
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end
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module.restore = function(state)
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data = state.data or {};
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recipients = state.recipients or {};
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hash_map = state.hash_map or {};
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end
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module:add_identity("pubsub", "pep", "Prosody");
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module:add_feature("http://jabber.org/protocol/pubsub#publish");
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local function subscription_presence(user_bare, recipient)
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local recipient_bare = jid_bare(recipient);
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if (recipient_bare == user_bare) then return true end
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local username, host = jid_split(user_bare);
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return is_contact_subscribed(username, host, recipient_bare);
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end
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local function publish(session, node, id, item)
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item.attr.xmlns = nil;
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local disable = #item.tags ~= 1 or #item.tags[1] == 0;
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if #item.tags == 0 then item.name = "retract"; end
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local bare = session.username..'@'..session.host;
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local stanza = st.message({from=bare, type='headline'})
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:tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
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:tag('items', {node=node})
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:add_child(item)
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:up()
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:up();
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-- store for the future
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local user_data = data[bare];
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if disable then
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if user_data then
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user_data[node] = nil;
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if not next(user_data) then data[bare] = nil; end
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end
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else
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if not user_data then user_data = {}; data[bare] = user_data; end
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user_data[node] = {id or "1", item};
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end
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-- broadcast
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for recipient, notify in pairs(recipients[bare] or NULL) do
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if notify[node] then
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stanza.attr.to = recipient;
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core_post_stanza(session, stanza);
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end
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end
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end
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local function publish_all(user, recipient, session)
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local d = data[user];
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local notify = recipients[user] and recipients[user][recipient];
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if d and notify then
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for node in pairs(notify) do
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if d[node] then
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local id, item = unpack(d[node]);
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session.send(st.message({from=user, to=recipient, type='headline'})
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:tag('event', {xmlns='http://jabber.org/protocol/pubsub#event'})
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:tag('items', {node=node})
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:add_child(item)
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:up()
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:up());
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end
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end
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end
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end
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local function get_caps_hash_from_presence(stanza, current)
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local t = stanza.attr.type;
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if not t then
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for _, child in pairs(stanza.tags) do
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if child.name == "c" and child.attr.xmlns == "http://jabber.org/protocol/caps" then
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local attr = child.attr;
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if attr.hash then -- new caps
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if attr.hash == 'sha-1' and attr.node and attr.ver then return attr.ver, attr.node.."#"..attr.ver; end
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else -- legacy caps
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if attr.node and attr.ver then return attr.node.."#"..attr.ver.."#"..(attr.ext or ""), attr.node.."#"..attr.ver; end
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end
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return; -- bad caps format
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end
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end
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elseif t == "unavailable" or t == "error" then
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return;
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end
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return current; -- no caps, could mean caps optimization, so return current
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end
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module:hook("presence/bare", function(event)
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-- inbound presence to bare JID recieved
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local origin, stanza = event.origin, event.stanza;
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local user = stanza.attr.to or (origin.username..'@'..origin.host);
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local t = stanza.attr.type;
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if not t then -- available presence
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if not stanza.attr.to or subscription_presence(user, stanza.attr.from) then
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local recipient = stanza.attr.from;
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local current = recipients[user] and recipients[user][recipient];
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local hash = get_caps_hash_from_presence(stanza, current);
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if current == hash then return; end
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if not hash then
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if recipients[user] then recipients[user][recipient] = nil; end
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else
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recipients[user] = recipients[user] or {};
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if hash_map[hash] then
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recipients[user][recipient] = hash_map[hash];
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publish_all(user, recipient, origin);
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else
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recipients[user][recipient] = hash;
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origin.send(
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st.stanza("iq", {from=stanza.attr.to, to=stanza.attr.from, id="disco", type="get"})
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:query("http://jabber.org/protocol/disco#info")
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);
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end
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end
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end
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elseif t == "unavailable" then
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if recipients[user] then recipients[user][stanza.attr.from] = nil; end
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end
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end, 10);
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module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function(event)
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local session, stanza = event.origin, event.stanza;
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local payload = stanza.tags[1];
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if stanza.attr.type == 'set' and (not stanza.attr.to or jid_bare(stanza.attr.from) == stanza.attr.to) then
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payload = payload.tags[1];
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if payload and (payload.name == 'publish' or payload.name == 'retract') and payload.attr.node then -- <publish node='http://jabber.org/protocol/tune'>
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local node = payload.attr.node;
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payload = payload.tags[1];
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if payload and payload.name == "item" then -- <item>
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local id = payload.attr.id;
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session.send(st.reply(stanza));
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publish(session, node, id, st.clone(payload));
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return true;
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end
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end
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elseif stanza.attr.type == 'get' then
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local user = stanza.attr.to and jid_bare(stanza.attr.to) or session.username..'@'..session.host;
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if subscription_presence(user, stanza.attr.from) then
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local user_data = data[user];
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local node, requested_id;
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payload = payload.tags[1];
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if payload and payload.name == 'items' then
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node = payload.attr.node;
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local item = payload.tags[1];
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if item and item.name == "item" then
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requested_id = item.attr.id;
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end
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end
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if node and user_data and user_data[node] then -- Send the last item
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local id, item = unpack(user_data[node]);
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if not requested_id or id == requested_id then
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local stanza = st.reply(stanza)
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:tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
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:tag('items', {node=node})
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:add_child(item)
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:up()
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:up();
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session.send(stanza);
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return true;
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else -- requested item doesn't exist
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local stanza = st.reply(stanza)
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:tag('pubsub', {xmlns='http://jabber.org/protocol/pubsub'})
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:tag('items', {node=node})
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:up();
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session.send(stanza);
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return true;
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end
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elseif node then -- node doesn't exist
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session.send(st.error_reply(stanza, 'cancel', 'item-not-found'));
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return true;
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else --invalid request
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session.send(st.error_reply(stanza, 'modify', 'bad-request'));
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return true;
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end
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else --no presence subscription
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session.send(st.error_reply(stanza, 'auth', 'not-authorized')
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:tag('presence-subscription-required', {xmlns='http://jabber.org/protocol/pubsub#errors'}));
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return true;
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end
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end
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end);
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module:hook("iq/bare/disco", function(event)
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local session, stanza = event.origin, event.stanza;
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if stanza.attr.type == "result" then
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local disco = stanza.tags[1];
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if disco and disco.name == "query" and disco.attr.xmlns == "http://jabber.org/protocol/disco#info" then
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-- Process disco response
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local user = stanza.attr.to or (session.username..'@'..session.host);
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local contact = stanza.attr.from;
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local current = recipients[user] and recipients[user][contact];
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if type(current) ~= "string" then return; end -- check if waiting for recipient's response
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local ver = current;
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if not string.find(current, "#") then
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ver = calculate_hash(disco.tags); -- calculate hash
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end
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local notify = {};
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for _, feature in pairs(disco.tags) do
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if feature.name == "feature" and feature.attr.var then
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local nfeature = feature.attr.var:match("^(.*)%+notify$");
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if nfeature then notify[nfeature] = true; end
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end
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end
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hash_map[ver] = notify; -- update hash map
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recipients[user][contact] = notify; -- set recipient's data to calculated data
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-- send messages to recipient
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publish_all(user, contact, session);
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end
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end
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end);
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module:hook("account-disco-info", function(event)
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local stanza = event.stanza;
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stanza:tag('identity', {category='pubsub', type='pep'}):up();
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stanza:tag('feature', {var='http://jabber.org/protocol/pubsub#publish'}):up();
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end);
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module:hook("account-disco-items", function(event)
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local stanza = event.stanza;
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local bare = stanza.attr.to;
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local user_data = data[bare];
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if user_data then
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for node, _ in pairs(user_data) do
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stanza:tag('item', {jid=bare, node=node}):up(); -- TODO we need to handle queries to these nodes
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end
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end
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end);
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