Software / code / prosody-modules
Changeset
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 |
| parents | 2906:d9603b555be2 |
| children | 2908:5665d14dcc6e |
| files | mod_inject_ecaps2/README.markdown mod_inject_ecaps2/mod_insert_ecaps2.lua |
| diffstat | 2 files changed, 100 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mod_inject_ecaps2/README.markdown Wed Mar 07 19:30:42 2018 +0100 @@ -0,0 +1,9 @@ +--- +summary: Injects ecaps2 elements (XEP-0390) in presence +--- + +Description +=========== + +This module injects ecaps2 elements in the presence once the legacy caps +(XEP-0115) are received.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mod_inject_ecaps2/mod_insert_ecaps2.lua Wed Mar 07 19:30:42 2018 +0100 @@ -0,0 +1,91 @@ +module:depends("cache_c2s_caps"); + +local st = require "util.stanza"; +local hashes = require "util.hashes"; +local base64 = require "util.encodings".base64; +local t_insert, t_sort, t_concat = table.insert, table.sort, table.concat; + +local algorithms = module:get_option_set("ecaps2_hashes", { "sha-256", "sha-512" }); + +-- TODO: Add all of the other hashes supported. +local algorithm_map = { + ["sha-256"] = hashes.sha256; + ["sha-512"] = hashes.sha512; +}; + +-- TODO: move that to util.caps maybe. +local function calculate_hash(disco_info) + local identities, features, extensions = {}, {}, {}; + for _, tag in ipairs(disco_info) do + if tag.name == "identity" then + t_insert(identities, ((tag.attr.category or "").."\x1f".. + (tag.attr.type or "").."\x1f".. + (tag.attr["xml:lang"] or "").."\x1f".. + (tag.attr.name or "").."\x1f\x1e")); + elseif tag.name == "feature" then + t_insert(features, (tag.attr.var or "").."\x1f"); + elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then + local form = {}; + for _, field in ipairs(tag.tags) do + if field.name == "field" and field.attr.xmlns == "jabber:x:data" and field.attr.var then + local values = {}; + for _, value in ipairs(field.tags) do + if value.name == "value" and value.attr.xmlns == "jabber:x:data" then + value = #value.tags == 0 and value:get_text(); + if value then t_insert(values, value.."\x1f"); end + end + end + t_sort(values); + if #values > 0 then + t_insert(form, field.attr.var.."\x1f"..t_concat(values, "\x1f").."\x1f\x1e"); + else + t_insert(form, field.attr.var.."\x1f\x1e"); + end + end + end + t_sort(form); + form = t_concat(form, "\x1d").."\x1d"; + t_insert(extensions, form); + else + return nil, "Unknown element in disco#info"; + end + end + t_sort(identities); + t_sort(features); + t_sort(extensions); + if #identities > 0 then identities = t_concat(identities, "\x1c").."\x1c"; else identities = "\x1c"; end + if #features > 0 then features = t_concat(features).."\x1c"; else features = "\x1c"; end + if #extensions > 0 then extensions = t_concat(extensions, "\x1c").."\x1c"; else extensions = "\x1c"; end + return features..identities..extensions; +end + +local function caps_handler(event) + local origin = event.origin; + + if origin.presence:get_child("c", "urn:xmpp:caps") then + return; + end + + local disco_info = origin.caps_cache; + if disco_info == nil then + return; + end + + local extension_string = calculate_hash(disco_info); + + local ecaps2 = st.stanza("c", { xmlns = "urn:xmpp:caps" }); + for algo in algorithms do + local func = algorithm_map[algo]; + if func ~= nil then + local hash = base64.encode(func(extension_string)); + ecaps2:tag("hash", { xmlns = "urn:xmpp:hashes:2"; algo = algo }) + :text(hash) + :up(); + end + end + + module:log("debug", "Injected ecaps2 element in presence"); + origin.presence:add_child(hashes); +end + +module:hook("c2s-capabilities-changed", caps_handler);
