annotate mod_sift/mod_sift.lua @ 4047:36b6e3e3f9e2

mod_conversejs: Disable automatic BOSH/WS endpoint discovery Converse.js 7.0 will enable this by default, but when using this module the BOSH and WebSocket endpoints are provided in the generated HTML, so automatic discovery is not needed and unlikely to work without an additional module.
author Kim Alvefur <zash@zash.se>
date Thu, 18 Jun 2020 15:24:34 +0200
parents 7dbde05b48a9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1
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2 local st = require "util.stanza";
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3 local jid_bare = require "util.jid".bare;
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4
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5 -- advertise disco features
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6 module:add_feature("urn:xmpp:sift:1");
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7
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8 -- supported features
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9 module:add_feature("urn:xmpp:sift:stanzas:iq");
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10 module:add_feature("urn:xmpp:sift:stanzas:message");
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11 module:add_feature("urn:xmpp:sift:stanzas:presence");
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12 module:add_feature("urn:xmpp:sift:recipients:all");
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13 module:add_feature("urn:xmpp:sift:senders:all");
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14
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15 -- allowed values of 'sender' and 'recipient' attributes
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16 local senders = {
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17 ["all"] = true;
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18 ["local"] = true;
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19 ["others"] = true;
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20 ["remote"] = true;
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21 ["self"] = true;
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22 };
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23 local recipients = {
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24 ["all"] = true;
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25 ["bare"] = true;
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26 ["full"] = true;
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27 };
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28
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29 -- this function converts a <message/>, <presence/> or <iq/> element in
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30 -- the SIFT namespace into a hashtable, for easy lookup
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31 local function to_hashtable(element)
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32 if element ~= nil then
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33 local hash = {};
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34 -- make sure the sender and recipient attributes has a valid value
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35 hash.sender = element.attr.sender or "all";
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36 if not senders[hash.sender] then return false; end -- bad value, returning false
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37 hash.recipient = element.attr.recipient or "all";
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38 if not recipients[hash.recipient] then return false; end -- bad value, returning false
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39 -- next we loop over all <allow/> elements
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40 for _, tag in ipairs(element) do
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41 if tag.name == "allow" and tag.attr.xmlns == "urn:xmpp:sift:1" then
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42 -- make sure the element is valid
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43 if not tag.attr.name or not tag.attr.ns then return false; end -- missing required attributes, returning false
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44 hash[tag.attr.ns.."|"..tag.attr.name] = true;
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45 hash.allowed = true; -- just a flag indicating we have some elements allowed
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46 end
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47 end
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48 return hash;
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49 end
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50 end
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51
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52 local data = {}; -- table with all our data
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53
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54 -- handle SIFT set
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55 module:hook("iq/self/urn:xmpp:sift:1:sift", function(event)
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56 local origin, stanza = event.origin, event.stanza;
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57 if stanza.attr.type == "set" then
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58 local sifttag = stanza.tags[1]; -- <sift/>
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59
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60 -- first, get the elements we are interested in
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61 local message = sifttag:get_child("message");
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62 local presence = sifttag:get_child("presence");
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63 local iq = sifttag:get_child("iq");
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64
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65 -- for quick lookup, convert the elements into hashtables
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66 message = to_hashtable(message);
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67 presence = to_hashtable(presence);
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68 iq = to_hashtable(iq);
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69
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70 -- make sure elements were valid
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71 if message == false or presence == false or iq == false then
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72 origin.send(st.error_reply(stanza, "modify", "bad-request"));
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73 return true;
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74 end
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75
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76 local existing = data[origin.full_jid] or {}; -- get existing data, if any
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77 data[origin.full_jid] = { presence = presence, message = message, iq = iq }; -- store new data
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78
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79 origin.send(st.reply(stanza)); -- send back IQ result
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80
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81 if not existing.presence and not origin.presence and presence then
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82 -- TODO send probes
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83 end
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84 return true;
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85 end
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86 end);
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87
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88 -- handle user disconnect
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89 module:hook("resource-unbind", function(event)
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90 data[event.session.full_jid] = nil; -- discard data
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91 end);
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92
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93 -- IQ handler
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94 module:hook("iq/full", function(event)
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95 local origin, stanza = event.origin, event.stanza;
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96 local siftdata = data[stanza.attr.to];
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97 if stanza.attr.type == "get" or stanza.attr.type == "set" then
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98 if siftdata and siftdata.iq then -- we seem to have an IQ filter
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99 local tag = stanza.tags[1]; -- the IQ child
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100 if not siftdata.iq[(tag.attr.xmlns or "jabber:client").."|"..tag.name] then
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101 -- element not allowed; sending back generic error
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102 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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103 return true;
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104 end
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105 end
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106 end
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107 end, 50);
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108
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109 -- Message to full JID handler
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110 module:hook("message/full", function(event)
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111 local origin, stanza = event.origin, event.stanza;
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112 local siftdata = data[stanza.attr.to];
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113 if siftdata and siftdata.message then -- we seem to have an message filter
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114 local allowed = false;
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115 for _, childtag in ipairs(stanza.tags) do
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116 if siftdata.message[(childtag.attr.xmlns or "jabber:client").."|"..childtag.name] then
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117 allowed = true;
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118 end
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119 end
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120 if not allowed then
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121 -- element not allowed; sending back generic error
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122 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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123 -- FIXME maybe send to offline storage
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124 return true;
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125 end
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126 end
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127 end, 50);
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128
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129 -- Message to bare JID handler
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130 module:hook("message/bare", function(event)
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131 local origin, stanza = event.origin, event.stanza;
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132 local user = bare_sessions[jid_bare(stanza.attr.to)];
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133 local allowed = false;
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134 for _, session in pairs(user and user.sessions or {}) do
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135 local siftdata = data[session.full_jid];
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136 if siftdata and siftdata.message then -- we seem to have an message filter
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137 for _, childtag in ipairs(stanza.tags) do
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
138 if siftdata.message[(childtag.attr.xmlns or "jabber:client").."|"..childtag.name] then
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
139 allowed = true;
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
140 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
141 end
141
b42a88eba9ba mod_sift: Don't disallow stanzas to bare JIDs when sifting is not in force for any resources.
Waqas Hussain <waqas20@gmail.com>
parents: 140
diff changeset
142 else
b42a88eba9ba mod_sift: Don't disallow stanzas to bare JIDs when sifting is not in force for any resources.
Waqas Hussain <waqas20@gmail.com>
parents: 140
diff changeset
143 allowed = true;
137
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
144 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
145 end
141
b42a88eba9ba mod_sift: Don't disallow stanzas to bare JIDs when sifting is not in force for any resources.
Waqas Hussain <waqas20@gmail.com>
parents: 140
diff changeset
146 if user and not allowed then
137
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
147 -- element not allowed; sending back generic error
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
148 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
149 -- FIXME maybe send to offline storage
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
150 return true;
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
151 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
152 end, 50);
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
153
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
154 -- Presence to full JID handler
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
155 module:hook("presence/full", function(event)
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Waqas Hussain <waqas20@gmail.com>
parents:
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156 local origin, stanza = event.origin, event.stanza;
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
157 local siftdata = data[stanza.attr.to];
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
158 if siftdata and siftdata.presence then -- we seem to have an presence filter
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
159 local allowed = false;
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
160 for _, childtag in ipairs(stanza.tags) do
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
161 if siftdata.presence[(childtag.attr.xmlns or "jabber:client").."|"..childtag.name] then
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
162 allowed = true;
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
163 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
164 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
165 if not allowed then
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
166 -- element not allowed; sending back generic error
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
167 --origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
168 return true;
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
169 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
170 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
171 end, 50);
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
172
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
173 -- Presence to bare JID handler
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
174 module:hook("presence/bare", function(event)
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
175 local origin, stanza = event.origin, event.stanza;
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
176 local user = bare_sessions[jid_bare(stanza.attr.to)];
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Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
177 local allowed = false;
142
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Waqas Hussain <waqas20@gmail.com>
parents: 141
diff changeset
178 for _, session in pairs(user and user.sessions or {}) do
137
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
179 local siftdata = data[session.full_jid];
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
180 if siftdata and siftdata.presence then -- we seem to have an presence filter
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
181 for _, childtag in ipairs(stanza.tags) do
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
182 if siftdata.presence[(childtag.attr.xmlns or "jabber:client").."|"..childtag.name] then
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
183 allowed = true;
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
184 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
185 end
141
b42a88eba9ba mod_sift: Don't disallow stanzas to bare JIDs when sifting is not in force for any resources.
Waqas Hussain <waqas20@gmail.com>
parents: 140
diff changeset
186 else
b42a88eba9ba mod_sift: Don't disallow stanzas to bare JIDs when sifting is not in force for any resources.
Waqas Hussain <waqas20@gmail.com>
parents: 140
diff changeset
187 allowed = true;
137
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
188 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
189 end
141
b42a88eba9ba mod_sift: Don't disallow stanzas to bare JIDs when sifting is not in force for any resources.
Waqas Hussain <waqas20@gmail.com>
parents: 140
diff changeset
190 if user and not allowed then
137
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
191 -- element not allowed; sending back generic error
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
192 --origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
193 return true;
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
194 end
34a3ec3e7dc3 mod_sift: Initial commit.
Waqas Hussain <waqas20@gmail.com>
parents:
diff changeset
195 end, 50);