prosody-modules
1d6bec35b752
mod_inject_ecaps2/mod_inject_ecaps2.lua

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mod_inject_ecaps2/mod_inject_ecaps2.lua @ 2909:1d6bec35b752

mod_inject_ecaps2: Rename the Lua file correctly
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 07 Mar 2018 19:40:20 +0100
parent 2908:mod_inject_ecaps2/mod_insert_ecaps2.lua@5665d14dcc6e
child 2910:415455faccae
comparison
equal deleted inserted replaced
2908:5665d14dcc6e 2909:1d6bec35b752
1 module:depends("cache_c2s_caps");
2
3 local st = require "util.stanza";
4 local hashes = require "util.hashes";
5 local base64 = require "util.encodings".base64;
6 local t_insert, t_sort, t_concat = table.insert, table.sort, table.concat;
7
8 local algorithms = module:get_option_set("ecaps2_hashes", { "sha-256", "sha-512" });
9
10 -- TODO: Add all of the other hashes supported.
11 local algorithm_map = {
12 ["sha-256"] = hashes.sha256;
13 ["sha-512"] = hashes.sha512;
14 };
15
16 -- TODO: move that to util.caps maybe.
17 local function calculate_hash(disco_info)
18 local identities, features, extensions = {}, {}, {};
19 for _, tag in ipairs(disco_info) do
20 if tag.name == "identity" then
21 t_insert(identities, ((tag.attr.category or "").."\31"..
22 (tag.attr.type or "").."\31"..
23 (tag.attr["xml:lang"] or "").."\31"..
24 (tag.attr.name or "").."\31\30"));
25 elseif tag.name == "feature" then
26 t_insert(features, (tag.attr.var or "").."\31");
27 elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
28 local form = {};
29 for _, field in ipairs(tag.tags) do
30 if field.name == "field" and field.attr.xmlns == "jabber:x:data" and field.attr.var then
31 local values = {};
32 for _, value in ipairs(field.tags) do
33 if value.name == "value" and value.attr.xmlns == "jabber:x:data" then
34 value = #value.tags == 0 and value:get_text();
35 if value then t_insert(values, value.."\31"); end
36 end
37 end
38 t_sort(values);
39 if #values > 0 then
40 t_insert(form, field.attr.var.."\31"..t_concat(values, "\31").."\31\30");
41 else
42 t_insert(form, field.attr.var.."\31\30");
43 end
44 end
45 end
46 t_sort(form);
47 form = t_concat(form, "\29").."\29";
48 t_insert(extensions, form);
49 else
50 return nil, "Unknown element in disco#info";
51 end
52 end
53 t_sort(identities);
54 t_sort(features);
55 t_sort(extensions);
56 if #identities > 0 then identities = t_concat(identities, "\28").."\28"; else identities = "\28"; end
57 if #features > 0 then features = t_concat(features).."\28"; else features = "\28"; end
58 if #extensions > 0 then extensions = t_concat(extensions, "\28").."\28"; else extensions = "\28"; end
59 return features..identities..extensions;
60 end
61
62 local function caps_handler(event)
63 local origin = event.origin;
64
65 if origin.presence:get_child("c", "urn:xmpp:caps") then
66 return;
67 end
68
69 local disco_info = origin.caps_cache;
70 if disco_info == nil then
71 return;
72 end
73
74 local extension_string = calculate_hash(disco_info);
75
76 local ecaps2 = st.stanza("c", { xmlns = "urn:xmpp:caps" });
77 for algo in algorithms do
78 local func = algorithm_map[algo];
79 if func ~= nil then
80 local hash = base64.encode(func(extension_string));
81 ecaps2:tag("hash", { xmlns = "urn:xmpp:hashes:2"; algo = algo })
82 :text(hash)
83 :up();
84 end
85 end
86
87 module:log("debug", "Injected ecaps2 element in presence");
88 origin.presence:add_child(hashes);
89 end
90
91 module:hook("c2s-capabilities-changed", caps_handler);