Annotate

mod_inject_ecaps2/mod_inject_ecaps2.lua @ 5645:3a5cf8d80089

mod_http_oauth2: Tweak method of centering the UI The percentage here was relative to the viewport width, which on some very wide screens may put the UI slightly outside of the view, requiring scrolling to see. By using a unit relative to the height of the viewport, this is avoided and should work better. But no guarantees, it's still possible to resize the browser or adjust font sizes so that the UI goes out of view.
author Kim Alvefur <zash@zash.se>
date Mon, 31 Jul 2023 07:28:09 +0200
parent 3105:ce946d9d982e
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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);