Mercurial > prosody-modules
view mod_inject_ecaps2/mod_inject_ecaps2.lua @ 4049:78f1de5301fc
mod_adhoc_dataforms_demo: Fix duplicate field prevention
It's supposed to only include each type of form field once per form at
most but it didn't note which fields it had added already. No idea what
the probability was anyways, probably pretty low.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Tue, 23 Jun 2020 19:40:55 +0200 |
parents | ce946d9d982e |
children |
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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 "").."\31".. (tag.attr.type or "").."\31".. (tag.attr["xml:lang"] or "").."\31".. (tag.attr.name or "").."\31\30")); elseif tag.name == "feature" then t_insert(features, (tag.attr.var or "").."\31"); 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.."\31"); end end end t_sort(values); if #values > 0 then t_insert(form, field.attr.var.."\31"..t_concat(values, "\31").."\31\30"); else t_insert(form, field.attr.var.."\31\30"); end end end t_sort(form); form = t_concat(form, "\29").."\29"; 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, "\28").."\28"; else identities = "\28"; end if #features > 0 then features = t_concat(features).."\28"; else features = "\28"; end if #extensions > 0 then extensions = t_concat(extensions, "\28").."\28"; else extensions = "\28"; end return features..identities..extensions; end local function caps_handler(event) local origin = event.origin; if origin.presence == nil or 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, err = calculate_hash(disco_info); if extension_string == nil then module:log("warn", "Failed to calculate ecaps2 hash: %s", err) return; end 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(ecaps2); end module:hook("c2s-capabilities-changed", caps_handler);