prosody-modules
776017c92076
mod_inject_ecaps2/mod_insert_ecaps2.lua
Software / code / prosody-modules
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mod_inject_ecaps2/mod_insert_ecaps2.lua @ 2907:776017c92076
mod_inject_ecaps2: New module adding support for XEP-0390 to all local clients supporting XEP-0115
| author | Emmanuel Gil Peyrot <linkmauve@linkmauve.fr> |
|---|---|
| date | Wed, 07 Mar 2018 19:30:42 +0100 |
| child | 2908:5665d14dcc6e |
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| 2906:d9603b555be2 | 2907:776017c92076 |
|---|---|
| 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 "").."\x1f".. | |
| 22 (tag.attr.type or "").."\x1f".. | |
| 23 (tag.attr["xml:lang"] or "").."\x1f".. | |
| 24 (tag.attr.name or "").."\x1f\x1e")); | |
| 25 elseif tag.name == "feature" then | |
| 26 t_insert(features, (tag.attr.var or "").."\x1f"); | |
| 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.."\x1f"); end | |
| 36 end | |
| 37 end | |
| 38 t_sort(values); | |
| 39 if #values > 0 then | |
| 40 t_insert(form, field.attr.var.."\x1f"..t_concat(values, "\x1f").."\x1f\x1e"); | |
| 41 else | |
| 42 t_insert(form, field.attr.var.."\x1f\x1e"); | |
| 43 end | |
| 44 end | |
| 45 end | |
| 46 t_sort(form); | |
| 47 form = t_concat(form, "\x1d").."\x1d"; | |
| 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, "\x1c").."\x1c"; else identities = "\x1c"; end | |
| 57 if #features > 0 then features = t_concat(features).."\x1c"; else features = "\x1c"; end | |
| 58 if #extensions > 0 then extensions = t_concat(extensions, "\x1c").."\x1c"; else extensions = "\x1c"; 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); |
