mirror of
https://github.com/bjc/prosody.git
synced 2025-04-03 05:07:42 +03:00
448 lines
15 KiB
Lua
448 lines
15 KiB
Lua
-- Prosody IM
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-- Copyright (C) 2009-2010 Matthew Wild
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-- Copyright (C) 2009-2010 Waqas Hussain
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-- Copyright (C) 2009 Thilo Cestonaro
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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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module:add_feature("jabber:iq:privacy");
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local st = require "util.stanza";
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local bare_sessions, full_sessions = prosody.bare_sessions, prosody.full_sessions;
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local util_Jid = require "util.jid";
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local jid_bare = util_Jid.bare;
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local jid_split, jid_join = util_Jid.split, util_Jid.join;
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local load_roster = require "core.rostermanager".load_roster;
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local to_number = tonumber;
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local privacy_storage = module:open_store();
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function isListUsed(origin, name, privacy_lists)
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local user = bare_sessions[origin.username.."@"..origin.host];
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if user then
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for resource, session in pairs(user.sessions) do
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if resource ~= origin.resource then
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if session.activePrivacyList == name then
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return true;
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elseif session.activePrivacyList == nil and privacy_lists.default == name then
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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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end
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end
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function isAnotherSessionUsingDefaultList(origin)
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local user = bare_sessions[origin.username.."@"..origin.host];
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if user then
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for resource, session in pairs(user.sessions) do
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if resource ~= origin.resource and session.activePrivacyList == nil then
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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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end
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function declineList(privacy_lists, origin, stanza, which)
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if which == "default" then
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if isAnotherSessionUsingDefaultList(origin) then
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return { "cancel", "conflict", "Another session is online and using the default list."};
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end
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privacy_lists.default = nil;
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origin.send(st.reply(stanza));
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elseif which == "active" then
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origin.activePrivacyList = nil;
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origin.send(st.reply(stanza));
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else
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return {"modify", "bad-request", "Neither default nor active list specifed to decline."};
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end
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return true;
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end
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function activateList(privacy_lists, origin, stanza, which, name)
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local list = privacy_lists.lists[name];
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if which == "default" and list then
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if isAnotherSessionUsingDefaultList(origin) then
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return {"cancel", "conflict", "Another session is online and using the default list."};
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end
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privacy_lists.default = name;
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origin.send(st.reply(stanza));
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elseif which == "active" and list then
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origin.activePrivacyList = name;
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origin.send(st.reply(stanza));
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elseif not list then
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return {"cancel", "item-not-found", "No such list: "..name};
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else
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return {"modify", "bad-request", "No list chosen to be active or default."};
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end
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return true;
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end
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function deleteList(privacy_lists, origin, stanza, name)
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local list = privacy_lists.lists[name];
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if list then
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if isListUsed(origin, name, privacy_lists) then
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return {"cancel", "conflict", "Another session is online and using the list which should be deleted."};
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end
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if privacy_lists.default == name then
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privacy_lists.default = nil;
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end
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if origin.activePrivacyList == name then
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origin.activePrivacyList = nil;
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end
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privacy_lists.lists[name] = nil;
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origin.send(st.reply(stanza));
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return true;
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end
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return {"modify", "bad-request", "Not existing list specifed to be deleted."};
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end
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function createOrReplaceList (privacy_lists, origin, stanza, name, entries)
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local bare_jid = origin.username.."@"..origin.host;
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if privacy_lists.lists == nil then
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privacy_lists.lists = {};
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end
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local list = {};
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privacy_lists.lists[name] = list;
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local orderCheck = {};
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list.name = name;
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list.items = {};
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for _,item in ipairs(entries) do
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if to_number(item.attr.order) == nil or to_number(item.attr.order) < 0 or orderCheck[item.attr.order] ~= nil then
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return {"modify", "bad-request", "Order attribute not valid."};
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end
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if item.attr.type ~= nil and item.attr.type ~= "jid" and item.attr.type ~= "subscription" and item.attr.type ~= "group" then
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return {"modify", "bad-request", "Type attribute not valid."};
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end
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local tmp = {};
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orderCheck[item.attr.order] = true;
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tmp["type"] = item.attr.type;
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tmp["value"] = item.attr.value;
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tmp["action"] = item.attr.action;
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tmp["order"] = to_number(item.attr.order);
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tmp["presence-in"] = false;
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tmp["presence-out"] = false;
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tmp["message"] = false;
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tmp["iq"] = false;
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if #item.tags > 0 then
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for _,tag in ipairs(item.tags) do
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tmp[tag.name] = true;
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end
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end
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if tmp.type == "subscription" then
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if tmp.value ~= "both" and
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tmp.value ~= "to" and
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tmp.value ~= "from" and
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tmp.value ~= "none" then
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return {"cancel", "bad-request", "Subscription value must be both, to, from or none."};
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end
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end
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if tmp.action ~= "deny" and tmp.action ~= "allow" then
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return {"cancel", "bad-request", "Action must be either deny or allow."};
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end
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list.items[#list.items + 1] = tmp;
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end
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table.sort(list, function(a, b) return a.order < b.order; end);
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origin.send(st.reply(stanza));
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if bare_sessions[bare_jid] ~= nil then
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local iq = st.iq ( { type = "set", id="push1" } );
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iq:tag ("query", { xmlns = "jabber:iq:privacy" } );
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iq:tag ("list", { name = list.name } ):up();
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iq:up();
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for resource, session in pairs(bare_sessions[bare_jid].sessions) do
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iq.attr.to = bare_jid.."/"..resource
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session.send(iq);
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end
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else
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return {"cancel", "bad-request", "internal error."};
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end
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return true;
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end
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function getList(privacy_lists, origin, stanza, name)
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local reply = st.reply(stanza);
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reply:tag("query", {xmlns="jabber:iq:privacy"});
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if name == nil then
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if privacy_lists.lists then
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if origin.activePrivacyList then
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reply:tag("active", {name=origin.activePrivacyList}):up();
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end
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if privacy_lists.default then
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reply:tag("default", {name=privacy_lists.default}):up();
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end
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for name,list in pairs(privacy_lists.lists) do
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reply:tag("list", {name=name}):up();
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end
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end
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else
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local list = privacy_lists.lists[name];
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if list then
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reply = reply:tag("list", {name=list.name});
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for _,item in ipairs(list.items) do
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reply:tag("item", {type=item.type, value=item.value, action=item.action, order=item.order});
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if item["message"] then reply:tag("message"):up(); end
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if item["iq"] then reply:tag("iq"):up(); end
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if item["presence-in"] then reply:tag("presence-in"):up(); end
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if item["presence-out"] then reply:tag("presence-out"):up(); end
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reply:up();
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end
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else
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return {"cancel", "item-not-found", "Unknown list specified."};
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end
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end
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origin.send(reply);
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return true;
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end
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module:hook("iq/bare/jabber:iq:privacy:query", function(data)
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local origin, stanza = data.origin, data.stanza;
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if stanza.attr.to == nil then -- only service requests to own bare JID
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local query = stanza.tags[1]; -- the query element
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local valid = false;
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local privacy_lists = privacy_storage:get(origin.username) or { lists = {} };
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if privacy_lists.lists[1] then -- Code to migrate from old privacy lists format, remove in 0.8
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module:log("info", "Upgrading format of stored privacy lists for %s@%s", origin.username, origin.host);
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local lists = privacy_lists.lists;
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for idx, list in ipairs(lists) do
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lists[list.name] = list;
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lists[idx] = nil;
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end
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end
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if stanza.attr.type == "set" then
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if #query.tags == 1 then -- the <query/> element MUST NOT include more than one child element
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for _,tag in ipairs(query.tags) do
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if tag.name == "active" or tag.name == "default" then
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if tag.attr.name == nil then -- Client declines the use of active / default list
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valid = declineList(privacy_lists, origin, stanza, tag.name);
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else -- Client requests change of active / default list
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valid = activateList(privacy_lists, origin, stanza, tag.name, tag.attr.name);
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end
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elseif tag.name == "list" and tag.attr.name then -- Client adds / edits a privacy list
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if #tag.tags == 0 then -- Client removes a privacy list
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valid = deleteList(privacy_lists, origin, stanza, tag.attr.name);
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else -- Client edits a privacy list
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valid = createOrReplaceList(privacy_lists, origin, stanza, tag.attr.name, tag.tags);
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end
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end
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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 name = nil;
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local listsToRetrieve = 0;
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if #query.tags >= 1 then
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for _,tag in ipairs(query.tags) do
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if tag.name == "list" then -- Client requests a privacy list from server
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name = tag.attr.name;
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listsToRetrieve = listsToRetrieve + 1;
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end
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end
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end
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if listsToRetrieve == 0 or listsToRetrieve == 1 then
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valid = getList(privacy_lists, origin, stanza, name);
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end
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end
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if valid ~= true then
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valid = valid or { "cancel", "bad-request", "Couldn't understand request" };
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if valid[1] == nil then
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valid[1] = "cancel";
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end
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if valid[2] == nil then
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valid[2] = "bad-request";
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end
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origin.send(st.error_reply(stanza, valid[1], valid[2], valid[3]));
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else
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privacy_storage:set(origin.username, privacy_lists);
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end
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return true;
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end
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end);
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function checkIfNeedToBeBlocked(e, session)
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local origin, stanza = e.origin, e.stanza;
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local privacy_lists = privacy_storage:get(session.username) or {};
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local bare_jid = session.username.."@"..session.host;
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local to = stanza.attr.to or bare_jid;
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local from = stanza.attr.from;
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local is_to_user = bare_jid == jid_bare(to);
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local is_from_user = bare_jid == jid_bare(from);
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--module:log("debug", "stanza: %s, to: %s, from: %s", tostring(stanza.name), tostring(to), tostring(from));
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if privacy_lists.lists == nil or
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not (session.activePrivacyList or privacy_lists.default)
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then
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return; -- Nothing to block, default is Allow all
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end
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if is_from_user and is_to_user then
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--module:log("debug", "Not blocking communications between user's resources");
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return; -- from one of a user's resource to another => HANDS OFF!
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end
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local listname = session.activePrivacyList;
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if listname == nil then
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listname = privacy_lists.default; -- no active list selected, use default list
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end
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local list = privacy_lists.lists[listname];
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if not list then -- should never happen
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module:log("warn", "given privacy list not found. name: %s for user %s", listname, bare_jid);
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return;
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end
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for _,item in ipairs(list.items) do
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local apply = false;
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local block = false;
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if (
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(stanza.name == "message" and item.message) or
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(stanza.name == "iq" and item.iq) or
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(stanza.name == "presence" and is_to_user and item["presence-in"]) or
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(stanza.name == "presence" and is_from_user and item["presence-out"]) or
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(item.message == false and item.iq == false and item["presence-in"] == false and item["presence-out"] == false)
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) then
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apply = true;
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end
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if apply then
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local evilJid = {};
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apply = false;
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if is_to_user then
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--module:log("debug", "evil jid is (from): %s", from);
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evilJid.node, evilJid.host, evilJid.resource = jid_split(from);
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else
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--module:log("debug", "evil jid is (to): %s", to);
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evilJid.node, evilJid.host, evilJid.resource = jid_split(to);
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end
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if item.type == "jid" and
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(evilJid.node and evilJid.host and evilJid.resource and item.value == evilJid.node.."@"..evilJid.host.."/"..evilJid.resource) or
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(evilJid.node and evilJid.host and item.value == evilJid.node.."@"..evilJid.host) or
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(evilJid.host and evilJid.resource and item.value == evilJid.host.."/"..evilJid.resource) or
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(evilJid.host and item.value == evilJid.host) then
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apply = true;
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block = (item.action == "deny");
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elseif item.type == "group" then
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local roster = load_roster(session.username, session.host);
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local roster_entry = roster[jid_join(evilJid.node, evilJid.host)];
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if roster_entry then
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local groups = roster_entry.groups;
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for group in pairs(groups) do
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if group == item.value then
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apply = true;
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block = (item.action == "deny");
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break;
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end
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end
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end
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elseif item.type == "subscription" then -- we need a valid bare evil jid
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local roster = load_roster(session.username, session.host);
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local roster_entry = roster[jid_join(evilJid.node, evilJid.host)];
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if (not(roster_entry) and item.value == "none")
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or (roster_entry and roster_entry.subscription == item.value) then
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apply = true;
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block = (item.action == "deny");
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end
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elseif item.type == nil then
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apply = true;
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block = (item.action == "deny");
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end
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end
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if apply then
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if block then
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-- drop and not bounce groupchat messages, otherwise users will get kicked
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if stanza.attr.type == "groupchat" then
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return true;
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end
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module:log("debug", "stanza blocked: %s, to: %s, from: %s", tostring(stanza.name), tostring(to), tostring(from));
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if stanza.name == "message" then
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origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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elseif stanza.name == "iq" and (stanza.attr.type == "get" or stanza.attr.type == "set") then
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origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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end
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return true; -- stanza blocked !
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else
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--module:log("debug", "stanza explicitly allowed!")
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return;
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end
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end
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end
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end
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function preCheckIncoming(e)
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local session;
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if e.stanza.attr.to ~= nil then
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local node, host, resource = jid_split(e.stanza.attr.to);
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if node == nil or host == nil then
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return;
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end
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if resource == nil then
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local prio = 0;
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if bare_sessions[node.."@"..host] ~= nil then
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for resource, session_ in pairs(bare_sessions[node.."@"..host].sessions) do
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if session_.priority ~= nil and session_.priority > prio then
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session = session_;
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prio = session_.priority;
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end
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end
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end
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else
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session = full_sessions[node.."@"..host.."/"..resource];
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end
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if session ~= nil then
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return checkIfNeedToBeBlocked(e, session);
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else
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--module:log("debug", "preCheckIncoming: Couldn't get session for jid: %s@%s/%s", tostring(node), tostring(host), tostring(resource));
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end
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end
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end
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function preCheckOutgoing(e)
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local session = e.origin;
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if e.stanza.attr.from == nil then
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e.stanza.attr.from = session.username .. "@" .. session.host;
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if session.resource ~= nil then
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e.stanza.attr.from = e.stanza.attr.from .. "/" .. session.resource;
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end
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end
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if session.username then -- FIXME do properly
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return checkIfNeedToBeBlocked(e, session);
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end
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end
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module:hook("pre-message/full", preCheckOutgoing, 500);
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module:hook("pre-message/bare", preCheckOutgoing, 500);
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module:hook("pre-message/host", preCheckOutgoing, 500);
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module:hook("pre-iq/full", preCheckOutgoing, 500);
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module:hook("pre-iq/bare", preCheckOutgoing, 500);
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module:hook("pre-iq/host", preCheckOutgoing, 500);
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module:hook("pre-presence/full", preCheckOutgoing, 500);
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module:hook("pre-presence/bare", preCheckOutgoing, 500);
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module:hook("pre-presence/host", preCheckOutgoing, 500);
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module:hook("message/full", preCheckIncoming, 500);
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module:hook("message/bare", preCheckIncoming, 500);
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module:hook("message/host", preCheckIncoming, 500);
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module:hook("iq/full", preCheckIncoming, 500);
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module:hook("iq/bare", preCheckIncoming, 500);
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module:hook("iq/host", preCheckIncoming, 500);
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module:hook("presence/full", preCheckIncoming, 500);
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module:hook("presence/bare", preCheckIncoming, 500);
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module:hook("presence/host", preCheckIncoming, 500);
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