Sat, 25 Oct 2008 03:13:10 +0500
Inbound subscription request
30 | 1 | |
2 | -- The code in this file should be self-explanatory, though the logic is horrible | |
3 | -- for more info on that, see doc/stanza_routing.txt, which attempts to condense | |
4 | -- the rules from the RFCs (mainly 3921) | |
5 | ||
6 | require "core.servermanager" | |
7 | ||
8 | local log = require "util.logger".init("stanzarouter") | |
9 | ||
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10 | local st = require "util.stanza"; |
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11 | local send = require "core.sessionmanager".send_to_session; |
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12 | local send_s2s = require "core.s2smanager".send_to_host; |
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13 | local user_exists = require "core.usermanager".user_exists; |
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14 | |
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15 | local rostermanager = require "core.rostermanager"; |
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16 | |
145 | 17 | local s2s_verify_dialback = require "core.s2smanager".verify_dialback; |
146 | 18 | local s2s_make_authenticated = require "core.s2smanager".make_authenticated; |
145 | 19 | local format = string.format; |
20 | local tostring = tostring; | |
21 | ||
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22 | local jid_split = require "util.jid".split; |
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23 | local print = print; |
30 | 24 | |
25 | function core_process_stanza(origin, stanza) | |
66 | 26 | log("debug", "Received: "..tostring(stanza)) |
73 | 27 | -- TODO verify validity of stanza (as well as JID validity) |
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28 | if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then |
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29 | if stanza.attr.type == "set" or stanza.attr.type == "get" then |
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30 | error("Invalid IQ"); |
148 | 31 | elseif #stanza.tags > 1 and not(stanza.attr.type == "error" or stanza.attr.type == "result") then |
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32 | error("Invalid IQ"); |
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33 | end |
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34 | end |
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35 | |
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36 | if origin.type == "c2s" and not origin.full_jid |
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37 | and not(stanza.name == "iq" and stanza.tags[1].name == "bind" |
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38 | and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then |
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39 | error("Client MUST bind resource after auth"); |
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40 | end |
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41 | |
30 | 42 | local to = stanza.attr.to; |
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43 | -- TODO also, stazas should be returned to their original state before the function ends |
145 | 44 | if origin.type == "c2s" then |
45 | stanza.attr.from = origin.full_jid; -- quick fix to prevent impersonation (FIXME this would be incorrect when the origin is not c2s) | |
46 | end | |
30 | 47 | |
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48 | if not to then |
170 | 49 | core_handle_stanza(origin, stanza); |
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50 | elseif hosts[to] and hosts[to].type == "local" then |
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51 | core_handle_stanza(origin, stanza); |
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52 | elseif stanza.name == "iq" and not select(3, jid_split(to)) then |
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53 | core_handle_stanza(origin, stanza); |
148 | 54 | elseif origin.type == "c2s" or origin.type == "s2sin" then |
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55 | core_route_stanza(origin, stanza); |
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56 | end |
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57 | end |
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58 | |
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59 | -- This function handles stanzas which are not routed any further, |
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60 | -- that is, they are handled by this server |
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61 | function core_handle_stanza(origin, stanza) |
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62 | -- Handlers |
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63 | if origin.type == "c2s" or origin.type == "c2s_unauthed" then |
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64 | local session = origin; |
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65 | |
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66 | if stanza.name == "presence" and origin.roster then |
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67 | if stanza.attr.type == nil or stanza.attr.type == "unavailable" then |
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68 | for jid in pairs(origin.roster) do -- broadcast to all interested contacts |
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69 | local subscription = origin.roster[jid].subscription; |
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70 | if subscription == "both" or subscription == "from" then |
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71 | stanza.attr.to = jid; |
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72 | core_route_stanza(origin, stanza); |
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73 | end |
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74 | end |
151 | 75 | local node, host = jid_split(stanza.attr.from); |
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76 | for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources |
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77 | if res ~= origin and res.full_jid then -- to resource. FIXME is res.full_jid the correct check? Maybe it should be res.presence |
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78 | stanza.attr.to = res.full_jid; |
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79 | core_route_stanza(origin, stanza); |
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80 | end |
151 | 81 | end |
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82 | if not origin.presence then -- presence probes on initial presence |
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83 | local probe = st.presence({from = origin.full_jid, type = "probe"}); |
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84 | for jid in pairs(origin.roster) do -- probe all contacts we are subscribed to |
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85 | local subscription = origin.roster[jid].subscription; |
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86 | if subscription == "both" or subscription == "to" then |
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87 | probe.attr.to = jid; |
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88 | core_route_stanza(origin, probe); |
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89 | end |
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90 | end |
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91 | for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all resources |
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92 | if res ~= origin and stanza.attr.type ~= "unavailable" and res.presence then -- FIXME does unavailable qualify as initial presence? |
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93 | res.presence.attr.to = origin.full_jid; |
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94 | core_route_stanza(res, res.presence); |
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95 | res.presence.attr.to = nil; |
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96 | end |
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97 | end |
151 | 98 | -- TODO resend subscription requests |
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99 | end |
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100 | origin.presence = stanza; |
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101 | stanza.attr.to = nil; -- reset it |
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102 | else |
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103 | -- TODO error, bad type |
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104 | end |
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105 | else |
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106 | log("debug", "Routing stanza to local"); |
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107 | handle_stanza(session, stanza); |
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108 | end |
148 | 109 | elseif origin.type == "s2sin_unauthed" or origin.type == "s2sin" then |
147 | 110 | if stanza.attr.xmlns == "jabber:server:dialback" then |
111 | if stanza.name == "verify" then | |
112 | -- We are being asked to verify the key, to ensure it was generated by us | |
113 | log("debug", "verifying dialback key..."); | |
114 | local attr = stanza.attr; | |
115 | print(tostring(attr.to), tostring(attr.from)) | |
116 | print(tostring(origin.to_host), tostring(origin.from_host)) | |
117 | -- FIXME: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34 | |
118 | --if attr.from ~= origin.to_host then error("invalid-from"); end | |
119 | local type = "invalid"; | |
120 | if s2s_verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then | |
121 | type = "valid" | |
122 | end | |
123 | origin.send(format("<db:verify from='%s' to='%s' id='%s' type='%s'>%s</db:verify>", attr.to, attr.from, attr.id, type, stanza[1])); | |
148 | 124 | elseif stanza.name == "result" and origin.type == "s2sin_unauthed" then |
125 | -- he wants to be identified through dialback | |
147 | 126 | -- We need to check the key with the Authoritative server |
127 | local attr = stanza.attr; | |
128 | origin.from_host = attr.from; | |
129 | origin.to_host = attr.to; | |
130 | origin.dialback_key = stanza[1]; | |
131 | log("debug", "asking %s if key %s belongs to them", attr.from, stanza[1]); | |
132 | send_s2s(attr.to, attr.from, format("<db:verify from='%s' to='%s' id='%s'>%s</db:verify>", attr.to, attr.from, origin.streamid, stanza[1])); | |
133 | hosts[attr.from].dialback_verifying = origin; | |
145 | 134 | end |
135 | end | |
147 | 136 | elseif origin.type == "s2sout_unauthed" or origin.type == "s2sout" then |
137 | if stanza.attr.xmlns == "jabber:server:dialback" then | |
138 | if stanza.name == "result" then | |
139 | if stanza.attr.type == "valid" then | |
140 | s2s_make_authenticated(origin); | |
141 | else | |
142 | -- FIXME | |
143 | error("dialback failed!"); | |
144 | end | |
145 | elseif stanza.name == "verify" and origin.dialback_verifying then | |
146 | local valid; | |
147 | local attr = stanza.attr; | |
148 | if attr.type == "valid" then | |
149 | s2s_make_authenticated(origin.dialback_verifying); | |
150 | valid = "valid"; | |
151 | else | |
152 | -- Warn the original connection that is was not verified successfully | |
153 | log("warn", "dialback for "..(origin.dialback_verifying.from_host or "(unknown)").." failed"); | |
154 | valid = "invalid"; | |
155 | end | |
156 | origin.dialback_verifying.send(format("<db:result from='%s' to='%s' id='%s' type='%s'>%s</db:result>", attr.from, attr.to, attr.id, valid, origin.dialback_verifying.dialback_key)); | |
146 | 157 | end |
158 | end | |
145 | 159 | else |
160 | log("warn", "Unhandled origin: %s", origin.type); | |
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161 | end |
30 | 162 | end |
163 | ||
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164 | function is_authorized_to_see_presence(origin, username, host) |
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165 | local roster = datamanager.load(username, host, "roster") or {}; |
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166 | local item = roster[origin.username.."@"..origin.host]; |
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167 | return item and (item.subscription == "both" or item.subscription == "from"); |
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168 | end |
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169 | |
30 | 170 | function core_route_stanza(origin, stanza) |
171 | -- Hooks | |
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172 | --- ...later |
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173 | |
30 | 174 | -- Deliver |
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175 | local to = stanza.attr.to; |
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176 | local node, host, resource = jid_split(to); |
170 | 177 | local to_bare = node and (node.."@"..host) or host; -- bare JID |
178 | local from = stanza.attr.from; | |
179 | local from_node, from_host, from_resource = jid_split(from); | |
180 | local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID | |
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181 | |
151 | 182 | if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") then resource = nil; end |
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183 | |
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184 | local host_session = hosts[host] |
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185 | if host_session and host_session.type == "local" then |
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186 | -- Local host |
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187 | local user = host_session.sessions[node]; |
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188 | if user then |
72 | 189 | local res = user.sessions[resource]; |
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190 | if not res then |
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191 | -- if we get here, resource was not specified or was unavailable |
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192 | if stanza.name == "presence" then |
151 | 193 | if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then |
194 | if stanza.attr.type == "probe" then | |
195 | if is_authorized_to_see_presence(origin, node, host) then | |
196 | for k in pairs(user.sessions) do -- return presence for all resources | |
170 | 197 | local pres = user.sessions[k].presence; |
198 | if pres then | |
171
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199 | pres.attr.to = from; -- FIXME use from_bare or from? |
151 | 200 | pres.attr.from = user.sessions[k].full_jid; |
201 | send(origin, pres); | |
202 | end | |
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203 | end |
171
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204 | pres.attr.to = nil; |
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205 | pres.attr.from = nil; |
151 | 206 | else |
171
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207 | send(origin, st.presence({from=to_bare, to=from_bare, type="unsubscribed"})); |
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208 | end |
151 | 209 | elseif stanza.attr.type == "subscribe" then |
174
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210 | if rostermanager.is_contact_subscribed(node, host, from_bare) then |
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211 | send(origin, st.presence(from=to_bare, to=from_bare, type="subscribed")); -- already subscribed |
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212 | else |
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213 | local pres = st.presence({from=from_bare}, type="subscribe"); |
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214 | for k in pairs(user.sessions) do -- return presence for all resources |
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215 | if user.sessions[k].presence then |
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216 | send(user.sessions[k], pres); |
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217 | end |
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218 | end |
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219 | end |
151 | 220 | elseif stanza.attr.type == "unsubscribe" then |
173 | 221 | if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then |
222 | rostermanager.roster_push(node, host, from_bare); | |
223 | end | |
151 | 224 | elseif stanza.attr.type == "subscribed" then |
171
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225 | if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then |
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226 | rostermanager.roster_push(node, host, from_bare); |
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227 | for k in pairs(user.sessions) do -- return presence for all resources |
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228 | local pres = user.sessions[k].presence; |
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229 | if pres then |
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230 | pres.attr.to = from; -- FIXME use from_bare or from? |
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231 | pres.attr.from = user.sessions[k].full_jid; |
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232 | send(origin, pres); |
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233 | end |
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234 | end |
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235 | pres.attr.to = nil; |
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236 | pres.attr.from = nil; |
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237 | end |
151 | 238 | elseif stanza.attr.type == "unsubscribed" then |
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239 | if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then |
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240 | rostermanager.roster_push(node, host, from_bare); |
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241 | end |
151 | 242 | end -- discard any other type |
243 | else -- sender is available or unavailable | |
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244 | for k in pairs(user.sessions) do -- presence broadcast to all user resources |
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245 | if user.sessions[k].full_jid then |
170 | 246 | stanza.attr.to = user.sessions[k].full_jid; -- reset at the end of function |
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247 | send(user.sessions[k], stanza); |
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248 | end |
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249 | end |
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250 | end |
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251 | elseif stanza.name == "message" then -- select a resource to recieve message |
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252 | for k in pairs(user.sessions) do |
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253 | if user.sessions[k].full_jid then |
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254 | res = user.sessions[k]; |
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255 | break; |
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256 | end |
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257 | end |
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258 | -- TODO find resource with greatest priority |
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259 | send(res, stanza); |
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260 | else |
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261 | -- TODO send IQ error |
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262 | end |
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263 | else |
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264 | -- User + resource is online... |
170 | 265 | stanza.attr.to = res.full_jid; -- reset at the end of function |
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266 | send(res, stanza); -- Yay \o/ |
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267 | end |
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268 | else |
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269 | -- user not online |
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270 | if user_exists(node, host) then |
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271 | if stanza.name == "presence" then |
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272 | if stanza.attr.type == "probe" and is_authorized_to_see_presence(origin, node, host) then -- FIXME what to do for not c2s? |
170 | 273 | -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too) |
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274 | else |
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275 | -- TODO send unavailable presence |
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276 | end |
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277 | elseif stanza.name == "message" then |
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278 | -- TODO send message error, or store offline messages |
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279 | elseif stanza.name == "iq" then |
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280 | -- TODO send IQ error |
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281 | end |
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282 | else -- user does not exist |
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283 | -- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses? |
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284 | if stanza.name == "presence" then |
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285 | if stanza.attr.type == "probe" then |
170 | 286 | send(origin, st.presence({from = to_bare, to = from_bare, type = "unsubscribed"})); |
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287 | end |
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288 | -- else ignore |
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289 | else |
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290 | send(origin, st.error_reply(stanza, "cancel", "service-unavailable")); |
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291 | end |
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292 | end |
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293 | end |
148 | 294 | elseif origin.type == "c2s" then |
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295 | -- Remote host |
170 | 296 | local xmlns = stanza.attr.xmlns; |
148 | 297 | --stanza.attr.xmlns = "jabber:server"; |
298 | stanza.attr.xmlns = nil; | |
146 | 299 | log("debug", "sending s2s stanza: %s", tostring(stanza)); |
170 | 300 | send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors |
301 | stanza.attr.xmlns = xmlns; -- reset | |
148 | 302 | else |
303 | log("warn", "received stanza from unhandled connection type: %s", origin.type); | |
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304 | end |
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305 | stanza.attr.to = to; -- reset |
30 | 306 | end |
307 | ||
308 | function handle_stanza_toremote(stanza) | |
309 | log("error", "Stanza bound for remote host, but s2s is not implemented"); | |
310 | end |