prosody-modules
f95a1e197a07
mod_auto_moved/mod_auto_moved.lua

Find changesets by keywords by author, files, the commit message, revision number or hash, or revset expression.

Software / code / prosody-modules

Comparison

mod_auto_moved/mod_auto_moved.lua @ 4679:f95a1e197a07

mod_auto_moved: New module implementing XEP-0283 r0.2.0
author Matthew Wild <mwild1@gmail.com>
date Sun, 12 Sep 2021 18:49:56 +0100
comparison
equal deleted inserted replaced
4678:0bcbff950f14 4679:f95a1e197a07
1 local id = require "util.id";
2 local jid = require "util.jid";
3 local promise = require "util.promise";
4 local rm = require "core.rostermanager";
5 local st = require "util.stanza";
6
7 local errors = require "util.error".init(module.name, {
8 ["statement-not-found"] = { type = "cancel", condition = "item-not-found" };
9 ["statement-mismatch"] = { type = "cancel", condition = "conlict" };
10 });
11
12 module:hook("presence/bare", function (event)
13 local origin, stanza = event.origin, event.stanza;
14 if stanza.attr.type ~= "subscribe" then
15 return; -- We're only interested in subscription requests
16 end
17 local moved = stanza:get_child("moved", "urn:xmpp:moved:1");
18 if not moved then
19 return; -- We're only interested in stanzas with a moved notification
20 end
21
22 local verification = stanza:get_child("moved-verification", "https://prosody.im/protocol/moved");
23 if verification then
24 return; -- We already attempted to verify this stanza
25 end
26
27 module:log("debug", "Received moved notification from %s", stanza.attr.from);
28
29 local old_jid = moved:get_child_text("old-jid");
30 if not old_jid then
31 return; -- Failed to read old JID
32 end
33
34 local to_user = jid.node(stanza.attr.to);
35 local new_jid_unverified = jid.bare(stanza.attr.from);
36
37 if not rm.is_contact_subscribed(to_user, module.host, old_jid) then
38 return; -- Old JID was not an existing contact, ignore
39 end
40
41 if rm.is_contact_pending_in(to_user, module.host, new_jid_unverified)
42 or rm.is_contact_subscribed(to_user, module.host, new_jid_unverified) then
43 return; -- New JID already subscribed or pending, ignore
44 end
45
46 local moved_statement_query = st.iq({ to = old_jid, type = "get", id = id.short() })
47 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
48 :tag("items", { node = "urn:xmpp:moved:1" })
49 :tag("item", { id = "current" }):up()
50 :up()
51 :up();
52 -- TODO: Catch and handle <gone/> errors per note in XEP-0283.
53 module:send_iq(moved_statement_query):next(function (reply)
54 module:log("debug", "Statement reply: %s", reply.stanza);
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");
56 if not moved_statement then
57 return promise.reject(errors.new("statement-not-found")); -- No statement found
58 end
59
60 local new_jid = jid.prep(moved_statement:get_child_text("new-jid"));
61 if new_jid ~= new_jid_unverified then
62 return promise.reject(errors.new("statement-mismatch")); -- Verification failed; JIDs do not match
63 end
64
65 -- Verified!
66 module:log("info", "Verified moved notification <%s> -> <%s>", old_jid, new_jid);
67
68 -- Add incoming subscription and respond
69 rm.set_contact_pending_in(to_user, module.host, new_jid);
70 rm.subscribed(to_user, module.host, new_jid);
71 module:send(st.presence({ to = new_jid, from = to_user.."@"..module.host, type = "subscribed" }));
72 rm.roster_push(to_user, module.host, new_jid);
73
74 -- Request outgoing subscription if old JID had one
75 if rm.is_user_subscribed(to_user, module.host, old_jid) then
76 module:log("debug", "Requesting subscription to new JID");
77 rm.set_contact_pending_out(to_user, module.host, new_jid);
78 module:send(st.presence({ to = new_jid, from = to_user.."@"..module.host, type = "subscribe" }));
79 end
80 end):catch(function (err)
81 module:log("debug", "Failed to verify moved statement for <%s> -> <%s>: %s", old_jid, new_jid_unverified, require "util.serialization".serialize(err, "debug"));
82 stanza:reset()
83 :tag("moved-verification", { xmlns = "https://prosody.im/protocol/moved", status = "failed" })
84 :up();
85 module:send(stanza, origin);
86 end);
87
88 -- Halt processing of the stanza, for now
89 return true;
90 end, 1);