Mercurial > prosody-modules

annotate mod_cache_c2s_caps/mod_cache_c2s_caps.lua @ 3902:341850e8866f

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mod_muc_moderation: Broadcast retraction via method that saves it Otherwise the retraction is not saved to history, so that those who join after it was sent are unaware of the retraction
author Kim Alvefur <zash@zash.se>
date Sat, 22 Feb 2020 21:41:31 +0100
parents 820c891a54cc
children f27becd421bd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local st_iq = require "util.stanza".iq;
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2 local uuid_gen = require "util.uuid".generate;
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3 local calculate_hash = require "util.caps".calculate_hash;
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4
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5 -- Map of jid..node, to avoid querying the same client multiple times for the same value.
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6 local in_flight_iqs = {}
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7
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8 -- Some clients (*ahem* poezio…) don’t include the @node in their result iq.
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9 local iq_node_map = {}
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10
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11 assert(module.send_iq, "This module is not compatible with this version of Prosody.");
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12
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13 local function iq_result_handler(event)
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14 local origin, stanza = event.origin, event.stanza;
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15
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16 local query = stanza:get_child("query", "http://jabber.org/protocol/disco#info");
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17 if not query then
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18 origin.log("debug", "Wrong iq payload in disco#info result: %s", stanza);
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19 origin.caps_cache = nil;
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20 return;
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21 end
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22
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23 local from = stanza.attr.from;
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24 local id = stanza.attr.id;
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25 local node_string = query.attr.node;
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26 local node_query = iq_node_map[from..id];
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27 if node_string == nil then
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28 node_string = node_query;
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29 query.attr.node = node_query;
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30 end
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31 iq_node_map[from..id] = nil;
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32
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33 if node_string ~= node_query then
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34 origin.log("debug", "Wrong node for our disco#info query, expected %s, received %s", node_string, node_query);
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35 origin.caps_cache = nil;
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36 return;
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37 end
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38
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39 local node, ver = node_query:match("([^#]+)#([^#]+)");
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40 local hash = calculate_hash(query)
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41 if ver ~= hash then
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42 origin.log("debug", "Wrong hash for disco#info: %s ~= %s", ver, hash);
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43 origin.caps_cache = nil;
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44 return;
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45 end
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46
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47 origin.caps_cache = query;
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48 origin.log("info", "Stored caps %s", ver);
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49 module:fire_event("c2s-capabilities-changed", { origin = origin });
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50 return true;
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51 end
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52
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53 local function iq_error_handler(err)
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54 local origin = err.context.origin;
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55 if origin ~= nil then
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56 origin.caps_cache = nil;
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57 module:fire_event("c2s-capabilities-changed", { origin = origin });
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58 end
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59 end
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60
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61 local function presence_stanza_handler(event)
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62 local origin, stanza = event.origin, event.stanza;
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63
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64 local from = stanza.attr.from;
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65 if stanza.attr.to ~= nil then
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66 return;
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67 end
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68
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69 local caps = stanza:get_child("c", "http://jabber.org/protocol/caps");
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70 if caps == nil then
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71 origin.log("debug", "Presence without caps received, skipping");
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72 return;
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73 end
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74
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75 local hash = caps.attr.hash;
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76 local node = caps.attr.node;
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77 local ver = caps.attr.ver;
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78 if not hash or not node or not ver then
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79 return;
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80 end
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81 if hash ~= "sha-1" then
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82 origin.log("warn", "Non-SHA-1 caps received: %s", hash);
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83 return;
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84 end
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85
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86 local node_query = node.."#"..ver;
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87 if (origin.caps_cache and origin.caps_cache.attr.node == node_query) or in_flight_iqs[from..node_query] ~= nil then
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88 origin.log("debug", "Already requested these caps, skipping");
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89 return;
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90 end
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91
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92 origin.log("debug", "Received presence with SHA-1 caps %s, querying disco#info", node_query);
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93
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94 local id = uuid_gen();
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95 iq_node_map[from..id] = node_query
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96 local iq = st_iq({ type = "get", from = module.host, to = from, id = id })
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97 :tag("query", { xmlns = "http://jabber.org/protocol/disco#info", node = node_query });
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98 in_flight_iqs[from..node_query] = true;
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99 module:send_iq(iq, origin)
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100 :next(iq_result_handler, iq_error_handler)
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101 :finally(function () in_flight_iqs[from..node_query] = nil; end)
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102 end
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103
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104 -- Handle only non-directed presences for now.
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105 module:hook("pre-presence/bare", presence_stanza_handler);