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annotate mod_inject_ecaps2/mod_inject_ecaps2.lua @ 4740:beeacb25dea9

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mod_rest: Add XEP-0004 mapping for future reuse For use with MAM and such
author Kim Alvefur <zash@zash.se>
date Thu, 04 Nov 2021 19:36:11 +0100
parents ce946d9d982e
children
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1 module:depends("cache_c2s_caps");
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2
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3 local st = require "util.stanza";
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4 local hashes = require "util.hashes";
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5 local base64 = require "util.encodings".base64;
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6 local t_insert, t_sort, t_concat = table.insert, table.sort, table.concat;
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8 local algorithms = module:get_option_set("ecaps2_hashes", { "sha-256", "sha-512" });
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10 -- TODO: Add all of the other hashes supported.
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11 local algorithm_map = {
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12 ["sha-256"] = hashes.sha256;
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13 ["sha-512"] = hashes.sha512;
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14 };
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16 -- TODO: move that to util.caps maybe.
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17 local function calculate_hash(disco_info)
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18 local identities, features, extensions = {}, {}, {};
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19 for _, tag in ipairs(disco_info) do
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20 if tag.name == "identity" then
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21 t_insert(identities, ((tag.attr.category or "").."\31"..
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22 (tag.attr.type or "").."\31"..
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23 (tag.attr["xml:lang"] or "").."\31"..
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24 (tag.attr.name or "").."\31\30"));
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25 elseif tag.name == "feature" then
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26 t_insert(features, (tag.attr.var or "").."\31");
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27 elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
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28 local form = {};
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29 for _, field in ipairs(tag.tags) do
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30 if field.name == "field" and field.attr.xmlns == "jabber:x:data" and field.attr.var then
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31 local values = {};
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32 for _, value in ipairs(field.tags) do
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33 if value.name == "value" and value.attr.xmlns == "jabber:x:data" then
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34 value = #value.tags == 0 and value:get_text();
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35 if value then t_insert(values, value.."\31"); end
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36 end
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37 end
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38 t_sort(values);
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39 if #values > 0 then
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40 t_insert(form, field.attr.var.."\31"..t_concat(values, "\31").."\31\30");
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41 else
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42 t_insert(form, field.attr.var.."\31\30");
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43 end
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44 end
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45 end
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46 t_sort(form);
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47 form = t_concat(form, "\29").."\29";
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48 t_insert(extensions, form);
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49 else
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50 return nil, "Unknown element in disco#info";
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51 end
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52 end
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53 t_sort(identities);
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54 t_sort(features);
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55 t_sort(extensions);
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56 if #identities > 0 then identities = t_concat(identities, "\28").."\28"; else identities = "\28"; end
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57 if #features > 0 then features = t_concat(features).."\28"; else features = "\28"; end
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58 if #extensions > 0 then extensions = t_concat(extensions, "\28").."\28"; else extensions = "\28"; end
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59 return features..identities..extensions;
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60 end
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61
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62 local function caps_handler(event)
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63 local origin = event.origin;
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64
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65 if origin.presence == nil or origin.presence:get_child("c", "urn:xmpp:caps") then
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66 return;
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67 end
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68
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69 local disco_info = origin.caps_cache;
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70 if disco_info == nil then
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71 return;
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72 end
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73
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74 local extension_string, err = calculate_hash(disco_info);
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75 if extension_string == nil then
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76 module:log("warn", "Failed to calculate ecaps2 hash: %s", err)
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77 return;
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78 end
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79
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80 local ecaps2 = st.stanza("c", { xmlns = "urn:xmpp:caps" });
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81 for algo in algorithms do
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82 local func = algorithm_map[algo];
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83 if func ~= nil then
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84 local hash = base64.encode(func(extension_string));
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85 ecaps2:tag("hash", { xmlns = "urn:xmpp:hashes:2"; algo = algo })
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86 :text(hash)
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87 :up();
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88 end
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89 end
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90
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91 module:log("debug", "Injected ecaps2 element in presence");
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92 origin.presence:add_child(ecaps2);
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93 end
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94
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95 module:hook("c2s-capabilities-changed", caps_handler);