annotate mod_mam/rsm.lib.lua @ 3902:341850e8866f

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 57ee26681561
children
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1 local stanza = require"util.stanza".stanza;
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2 local tostring, tonumber = tostring, tonumber;
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3 local type = type;
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4 local pairs = pairs;
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5
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6 local xmlns_rsm = 'http://jabber.org/protocol/rsm';
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7
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8 local element_parsers = {};
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9
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10 do
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11 local parsers = element_parsers;
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12 local function xs_int(st)
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13 return tonumber((st:get_text()));
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14 end
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15 local function xs_string(st)
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16 return st:get_text();
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17 end
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18
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19 parsers.after = xs_string;
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20 parsers.before = function(st)
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21 local text = st:get_text();
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22 return text == "" or text;
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23 end;
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24 parsers.max = xs_int;
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25 parsers.index = xs_int;
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26
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27 parsers.first = function(st)
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28 return { index = tonumber(st.attr.index); st:get_text() };
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29 end;
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30 parsers.last = xs_string;
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31 parsers.count = xs_int;
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32 end
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33
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34 local element_generators = setmetatable({
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35 first = function(st, data)
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36 if type(data) == "table" then
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37 st:tag("first", { index = data.index }):text(data[1]):up();
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38 else
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39 st:tag("first"):text(tostring(data)):up();
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40 end
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41 end;
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42 before = function(st, data)
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43 if data == true then
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44 st:tag("before"):up();
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45 else
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46 st:tag("before"):text(tostring(data)):up();
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47 end
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48 end
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49 }, {
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50 __index = function(_, name)
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51 return function(st, data)
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52 st:tag(name):text(tostring(data)):up();
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53 end
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54 end;
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55 });
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56
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57
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58 local function parse(set)
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59 local rs = {};
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60 for tag in set:childtags() do
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61 local name = tag.name;
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62 local parser = name and element_parsers[name];
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63 if parser then
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64 rs[name] = parser(tag);
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65 end
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66 end
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67 return rs;
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68 end
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69
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70 local function generate(t)
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71 local st = stanza("set", { xmlns = xmlns_rsm });
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72 for k,v in pairs(t) do
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73 if element_parsers[k] then
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74 element_generators[k](st, v);
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75 end
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76 end
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77 return st;
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78 end
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79
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80 local function get(st)
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81 local set = st:get_child("set", xmlns_rsm);
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82 if set and #set.tags > 0 then
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83 return parse(set);
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84 end
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85 end
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86
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87 return { parse = parse, generate = generate, get = get };