prosody-modules
e7b9bc629ecc
mod_inject_ecaps2/mod_inject_ecaps2.lua

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mod_inject_ecaps2/mod_inject_ecaps2.lua @ 4941:e7b9bc629ecc

mod_rest: Add special handling to catch MAM results from remote hosts Makes MAM queries to remote hosts works. As the comment says, MAM results from users' local archives or local MUCs are returned via origin.send() which is provided in the event and thus already worked. Results from remote hosts go via normal stanza routing and events, which need this extra handling to catch. This pattern of iq-set, message+, iq-result is generally limited to MAM. Closest similar thing might be MUC join, but to really handle that you would need the webhook callback mechanism.
author Kim Alvefur <zash@zash.se>
date Mon, 16 May 2022 19:47:09 +0200
parent 3105:ce946d9d982e
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rev   line source
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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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7
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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);