Mercurial > prosody-modules

annotate mod_pubsub_serverinfo/mod_pubsub_serverinfo.lua @ 5809:a8cae8322b7c

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mod_pubsub_serverinfo: Fix namespace parsing issue with disco/info Prosody's API works based on attribute definitions, without using namespace scopes.
author Guus der Kinderen <guus.der.kinderen@gmail.com>
date Thu, 04 Jan 2024 15:15:51 +0100
parents 2465d5191ae9
children 76b57bcfe1b2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local st = require "util.stanza";
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2 local new_id = require"util.id".medium;
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3 local dataform = require "util.dataforms".new;
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4
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5 local local_domain = module:get_host();
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6 local service = module:get_option(module.name .. "_service") or "pubsub." .. local_domain;
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7 local node = module:get_option(module.name .. "_node") or "serverinfo";
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8 local actor = module.host .. "/modules/" .. module.name;
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9 local publication_interval = module:get_option(module.name .. "_publication_interval") or 300;
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10 local cache_ttl = module:get_option(module.name .. "_cache_ttl") or 3600;
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11
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12 local opt_in_reports
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13
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14 function module.load()
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15 discover_node():next(
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16 function(exists)
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17 if not exists then create_node() end
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18 end
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19 ):catch(
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20 function(error)
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21 module:log("warn", "Error prevented discovery or creation of pub/sub node at %s: %s", service, error)
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22 end
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23 )
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24
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25 module:add_feature("urn:xmpp:serverinfo:0");
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26
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27 module:add_extension(dataform {
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28 { name = "FORM_TYPE", type = "hidden", value = "http://jabber.org/network/serverinfo" },
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29 { name = "serverinfo-pubsub-node", type = "text-single" },
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30 }:form({ ["serverinfo-pubsub-node"] = ("xmpp:%s?;node=%s"):format(service, node) }, "result"));
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31
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32 module:add_timer(10, publish_serverinfo);
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33 end
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34
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35 function module.unload()
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36 -- This removes all subscribers, which may or may not be desirable, depending on the reason for the unload.
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37 delete_node(); -- Should this block, to delay unload() until the node is deleted?
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38 end
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39
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40 -- Returns a promise of a boolean
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41 function discover_node()
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42 local request = st.iq({ type = "get", to = service, from = actor, id = new_id() })
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43 :tag("query", { xmlns = "http://jabber.org/protocol/disco#items" })
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44
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45 module:log("debug", "Sending request to discover existence of pub/sub node '%s' at %s", node, service)
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46 return module:send_iq(request):next(
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47 function(response)
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48 if response.stanza == nil or response.stanza.attr.type ~= "result" then
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49 module:log("warn", "Unexpected response to service discovery items request at %s: %s", service, response.stanza)
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50 return false
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51 end
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52
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53 local query = response.stanza:get_child("query", "http://jabber.org/protocol/disco#items")
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54 if query ~= nil then
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55 for item in query:childtags("item") do
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56 if item.attr.jid == service and item.attr.node == node then
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57 module:log("debug", "pub/sub node '%s' at %s does exists.", node, service)
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58 return true
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59 end
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60 end
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61 end
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62 module:log("debug", "pub/sub node '%s' at %s does not exist.", node, service)
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63 return false;
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64 end
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65 );
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66 end
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67
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68 -- Returns a promise of a boolean
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69 function create_node()
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70 local request = st.iq({ type = "set", to = service, from = actor, id = new_id() })
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71 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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72 :tag("create", { node = node }):up()
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73 :tag("configure")
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74 :tag("x", { xmlns = "jabber:x:data", type = "submit" })
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75 :tag("field", { var = "FORM_TYPE", type = "hidden"})
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76 :text_tag("value", "http://jabber.org/protocol/pubsub#node_config")
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77 :up()
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78 :tag("field", { var = "pubsub#max_items" })
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79 :text_tag("value", "1")
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80 :up()
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81 :tag("field", { var = "pubsub#persist_items" })
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82 :text_tag("value", "0")
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83
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84 module:log("debug", "Sending request to create pub/sub node '%s' at %s", node, service)
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85 return module:send_iq(request):next(
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86 function(response)
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87 if response.stanza == nil or response.stanza.attr.type ~= "result" then
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88 module:log("warn", "Unexpected response to pub/sub node '%s' creation request at %s: %s", node, service, response.stanza)
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89 return false
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90 else
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91 module:log("debug", "Successfully created pub/sub node '%s' at %s", node, service)
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92 return true
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93 end
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94 end
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95 )
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96 end
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97
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98 -- Returns a promise of a boolean
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99 function delete_node()
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100 local request = st.iq({ type = "set", to = service, from = actor, id = new_id() })
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101 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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102 :tag("delete", { node = node });
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103
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104 module:log("debug", "Sending request to delete pub/sub node '%s' at %s", node, service)
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105 return module:send_iq(request):next(
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106 function(response)
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107 if response.stanza == nil or response.stanza.attr.type ~= "result" then
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108 module:log("warn", "Unexpected response to pub/sub node '%s' deletion request at %s: %s", node, service, response.stanza)
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109 return false
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110 else
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111 module:log("debug", "Successfully deleted pub/sub node '%s' at %s", node, service)
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112 return true
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113 end
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114 end
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115 )
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116 end
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117
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118 function publish_serverinfo()
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119 -- Iterate over s2s sessions, adding them to a multimap, where the key is the local domain name,
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120 -- mapped to a collection of remote domain names. De-duplicate all remote domain names by using
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121 -- them as an index in a table.
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122 local domains_by_host = {}
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123 for session, _ in pairs(prosody.incoming_s2s) do
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124 if session ~= nil and session.from_host ~= nil and local_domain == session.to_host then
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125 module:log("debug", "Local host '%s' has remote '%s' (inbound)", session.to_host, session.from_host);
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126 local sessions = domains_by_host[session.to_host]
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127 if sessions == nil then sessions = {} end; -- instantiate a new entry if none existed
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128 sessions[session.from_host] = true
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129 domains_by_host[session.to_host] = sessions
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130 end
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131 end
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132
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133 -- At an earlier stage, the code iterated over all prosody.hosts, trying to generate one pubsub item for all local hosts. That turned out to be
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134 -- to noisy. Instead, this code now creates an item that includes the local vhost only. It is assumed that this module will also be loaded for
2465d5191ae9 mod_pubsub_serverinfo: Consider sibling vhosts 'connected'
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135 -- other vhosts. Their data should then be published to distinct pub/sub services and nodes.
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136
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137 -- for host, data in pairs(prosody.hosts) do
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138 local host = local_domain
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139 local data = prosody.hosts[host]
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140 if data ~= nil then
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141 local sessions = domains_by_host[host]
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142 if sessions == nil then sessions = {} end; -- instantiate a new entry if none existed
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143 if data.s2sout ~= nil then
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144 for _, session in pairs(data.s2sout) do
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145 if session.to_host ~= nil then
5808
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146 module:log("debug", "Local host '%s' has remote '%s' (outbound)", host, session.to_host);
5803
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147 sessions[session.to_host] = true
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148 domains_by_host[host] = sessions
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149 end
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150 end
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151 end
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152
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153 -- When the instance of Prosody hosts more than one host, the other hosts can be thought of as having a 'permanent' s2s connection.
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154 for host_name, host_info in pairs(prosody.hosts) do
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155 if host ~= host_name and host_info.type ~= "component" then
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156 module:log("debug", "Local host '%s' has remote '%s' (vhost)", host, host_name);
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157 sessions[host_name] = true;
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158 domains_by_host[host] = sessions
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159 end
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160 end
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161 end
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162
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163 -- Build the publication stanza.
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164 local request = st.iq({ type = "set", to = service, from = actor, id = new_id() })
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165 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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166 :tag("publish", { node = node, xmlns = "http://jabber.org/protocol/pubsub" })
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167 :tag("item", { id = "current", xmlns = "http://jabber.org/protocol/pubsub" })
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168 :tag("serverinfo", { xmlns = "urn:xmpp:serverinfo:0" })
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169
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170 request:tag("domain", { name = local_domain })
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171 :tag("federation")
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172
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173 local remotes = domains_by_host[host]
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174
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175 if remotes ~= nil then
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176 for remote, _ in pairs(remotes) do
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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177 -- include a domain name for remote domains, but only if they advertise support.
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178 if does_opt_in(remote) then
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179 request:tag("remote-domain", { name = remote }):up()
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180 else
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181 request:tag("remote-domain"):up()
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182 end
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183 end
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184 end
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185
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diff changeset
186 request:up():up()
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187
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188 module:send_iq(request):next(
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189 function(response)
c3eeeb968403 mod_pubsub_serverinfo: Detect existence of pub/sub node
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diff changeset
190 if response.stanza == nil or response.stanza.attr.type ~= "result" then
c3eeeb968403 mod_pubsub_serverinfo: Detect existence of pub/sub node
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191 module:log("warn", "Unexpected response to item publication at pub/sub node '%s' on %s: %s", node, service, response.stanza)
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192 return false
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193 else
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194 module:log("debug", "Successfully published item on pub/sub node '%s' at %s", node, service)
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195 return true
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196 end
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Guus der Kinderen <guus.der.kinderen@gmail.com>
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197 end,
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diff changeset
198 function(error)
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199 module:log("warn", "Error prevented publication of item on pub/sub node at %s: %s", service, error)
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diff changeset
200 end
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Guus der Kinderen <guus.der.kinderen@gmail.com>
parents: 5803
diff changeset
201 )
5803
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202
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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diff changeset
203 return publication_interval;
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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204 end
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205
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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diff changeset
206 local opt_in_cache = {}
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207
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diff changeset
208 function does_opt_in(remoteDomain)
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209
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210 -- try to read answer from cache.
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Guus der Kinderen <guus.der.kinderen@gmail.com>
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diff changeset
211 local cached_value = opt_in_cache[remoteDomain]
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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parents: 5801
diff changeset
212 if cached_value ~= nil and os.difftime(cached_value.expires, os.time()) > 0 then
5808
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diff changeset
213 module:log("debug", "Opt-in status (from cache) for '%s': %s", remoteDomain, cached_value.opt_in)
5803
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diff changeset
214 return cached_value.opt_in;
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diff changeset
215 end
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216
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diff changeset
217 -- TODO worry about not having multiple requests in flight to the same domain.cached_value
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218
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219 -- Cache could not provide an answer. Perform service discovery.
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220 module:log("debug", "No cached opt-in status for '%s': performing disco/info to determine opt-in.", remoteDomain)
5803
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diff changeset
221 local discoRequest = st.iq({ type = "get", to = remoteDomain, from = actor, id = new_id() })
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diff changeset
222 :tag("query", { xmlns = "http://jabber.org/protocol/disco#info" })
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diff changeset
223
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
Guus der Kinderen <guus.der.kinderen@gmail.com>
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diff changeset
224 module:send_iq(discoRequest):next(
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diff changeset
225 function(response)
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diff changeset
226 if response.stanza ~= nil and response.stanza.attr.type == "result" then
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diff changeset
227 local query = response.stanza:get_child("query", "http://jabber.org/protocol/disco#info")
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diff changeset
228 if query ~= nil then
5809
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diff changeset
229 for feature in query:childtags("feature") do
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230 module:log("debug", "Disco/info feature for '%s': %s", remoteDomain, feature)
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diff changeset
231 if feature.attr.var == 'urn:xmpp:serverinfo:0' then
5808
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diff changeset
232 module:log("debug", "Disco/info response included opt-in for '%s'", remoteDomain)
5803
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diff changeset
233 opt_in_cache[remoteDomain] = {
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diff changeset
234 opt_in = true;
5805
55b99f593c3a mod_pubsub_serverinfo: Disco/info cache TTL should be configurable
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diff changeset
235 expires = os.time() + cache_ttl;
5803
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diff changeset
236 }
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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diff changeset
237 return; -- prevent 'false' to be cached, down below.
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238 end
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parents: 5801
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239 end
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240 end
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241 end
5808
2465d5191ae9 mod_pubsub_serverinfo: Consider sibling vhosts 'connected'
Guus der Kinderen <guus.der.kinderen@gmail.com>
parents: 5805
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242 module:log("debug", "Disco/info response did not include opt-in for '%s'", remoteDomain)
5803
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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parents: 5801
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243 opt_in_cache[remoteDomain] = {
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244 opt_in = false;
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55b99f593c3a mod_pubsub_serverinfo: Disco/info cache TTL should be configurable
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parents: 5804
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245 expires = os.time() + cache_ttl;
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246 }
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247 end,
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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248 function(response)
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249 module:log("debug", "An error occurred while performing a disco/info request to determine opt-in for '%s'", remoteDomain, response)
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parents: 5801
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250 opt_in_cache[remoteDomain] = {
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parents: 5801
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251 opt_in = false;
5805
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parents: 5804
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252 expires = os.time() + cache_ttl;
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253 }
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parents: 5801
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254 end
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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parents: 5801
diff changeset
255 );
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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256
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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parents: 5801
diff changeset
257 -- return 'false' for now. Better luck next time...
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258 return false;
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259
f55e65315ba0 mod_pubsub_serverinfo: implemented all basic features
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parents: 5801
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260 end