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annotate mod_auto_moved/mod_auto_moved.lua @ 5068:20e635eb4cdc

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mod_sasl2_fast: More robust handling of stream@from and user-agent@id
author Matthew Wild <mwild1@gmail.com>
date Fri, 14 Oct 2022 15:44:00 +0100
parents f95a1e197a07
children
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1 local id = require "util.id";
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2 local jid = require "util.jid";
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3 local promise = require "util.promise";
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4 local rm = require "core.rostermanager";
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5 local st = require "util.stanza";
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6
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7 local errors = require "util.error".init(module.name, {
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8 ["statement-not-found"] = { type = "cancel", condition = "item-not-found" };
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9 ["statement-mismatch"] = { type = "cancel", condition = "conlict" };
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10 });
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11
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12 module:hook("presence/bare", function (event)
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13 local origin, stanza = event.origin, event.stanza;
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14 if stanza.attr.type ~= "subscribe" then
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15 return; -- We're only interested in subscription requests
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16 end
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17 local moved = stanza:get_child("moved", "urn:xmpp:moved:1");
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18 if not moved then
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19 return; -- We're only interested in stanzas with a moved notification
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20 end
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21
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22 local verification = stanza:get_child("moved-verification", "https://prosody.im/protocol/moved");
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23 if verification then
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24 return; -- We already attempted to verify this stanza
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25 end
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26
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27 module:log("debug", "Received moved notification from %s", stanza.attr.from);
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28
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29 local old_jid = moved:get_child_text("old-jid");
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30 if not old_jid then
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31 return; -- Failed to read old JID
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32 end
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33
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34 local to_user = jid.node(stanza.attr.to);
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35 local new_jid_unverified = jid.bare(stanza.attr.from);
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36
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37 if not rm.is_contact_subscribed(to_user, module.host, old_jid) then
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38 return; -- Old JID was not an existing contact, ignore
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39 end
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40
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41 if rm.is_contact_pending_in(to_user, module.host, new_jid_unverified)
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42 or rm.is_contact_subscribed(to_user, module.host, new_jid_unverified) then
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43 return; -- New JID already subscribed or pending, ignore
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44 end
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45
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46 local moved_statement_query = st.iq({ to = old_jid, type = "get", id = id.short() })
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47 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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48 :tag("items", { node = "urn:xmpp:moved:1" })
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49 :tag("item", { id = "current" }):up()
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50 :up()
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51 :up();
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52 -- TODO: Catch and handle <gone/> errors per note in XEP-0283.
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53 module:send_iq(moved_statement_query):next(function (reply)
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54 module:log("debug", "Statement reply: %s", reply.stanza);
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55 local moved_statement = reply.stanza:find("{http://jabber.org/protocol/pubsub}pubsub/items/{http://jabber.org/protocol/pubsub}item/{urn:xmpp:moved:1}moved");
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56 if not moved_statement then
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57 return promise.reject(errors.new("statement-not-found")); -- No statement found
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58 end
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59
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60 local new_jid = jid.prep(moved_statement:get_child_text("new-jid"));
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61 if new_jid ~= new_jid_unverified then
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62 return promise.reject(errors.new("statement-mismatch")); -- Verification failed; JIDs do not match
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63 end
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64
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65 -- Verified!
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66 module:log("info", "Verified moved notification <%s> -> <%s>", old_jid, new_jid);
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67
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68 -- Add incoming subscription and respond
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69 rm.set_contact_pending_in(to_user, module.host, new_jid);
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70 rm.subscribed(to_user, module.host, new_jid);
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71 module:send(st.presence({ to = new_jid, from = to_user.."@"..module.host, type = "subscribed" }));
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72 rm.roster_push(to_user, module.host, new_jid);
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73
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74 -- Request outgoing subscription if old JID had one
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75 if rm.is_user_subscribed(to_user, module.host, old_jid) then
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76 module:log("debug", "Requesting subscription to new JID");
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77 rm.set_contact_pending_out(to_user, module.host, new_jid);
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78 module:send(st.presence({ to = new_jid, from = to_user.."@"..module.host, type = "subscribe" }));
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79 end
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80 end):catch(function (err)
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81 module:log("debug", "Failed to verify moved statement for <%s> -> <%s>: %s", old_jid, new_jid_unverified, require "util.serialization".serialize(err, "debug"));
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82 stanza:reset()
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83 :tag("moved-verification", { xmlns = "https://prosody.im/protocol/moved", status = "failed" })
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84 :up();
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85 module:send(stanza, origin);
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86 end);
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87
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88 -- Halt processing of the stanza, for now
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89 return true;
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90 end, 1);