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annotate mod_muc_badge/mod_muc_badge.lua @ 5684:7c264a2cb970

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mod_storage_ejabberdsql_readonly: Don't use MySQL-specific syntax util.sql should take care of transformation when MySQL is in use.
author Matthew Wild <mwild1@gmail.com>
date Mon, 30 Oct 2023 12:28:12 +0000
parents 8a4b17e2e984
children
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774845606d73 mod_muc_badge: Generates a SVG badge with the number of occupants in rooms
Kim Alvefur <zash@zash.se>
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1 -- MIT License
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2 --
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3 -- Copyright (c) 2018 Kim Alvefur
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4 --
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5 -- Permission is hereby granted, free of charge, to any person obtaining a copy
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6 -- of this software and associated documentation files (the "Software"), to deal
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7 -- in the Software without restriction, including without limitation the rights
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8 -- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 -- copies of the Software, and to permit persons to whom the Software is
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10 -- furnished to do so, subject to the following conditions:
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11 --
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12 -- The above copyright notice and this permission notice shall be included in
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13 -- all copies or substantial portions of the Software.
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14 --
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15 -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 -- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 -- IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 -- CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 -- TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 -- SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22
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23 module:depends"http";
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24
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25 local jid_prep = require "util.jid".prep;
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26 local jid_split = require "util.jid".split;
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27
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28 -- Support both old and new MUC code
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29 local mod_muc = module:depends"muc";
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30 local rooms = rawget(mod_muc, "rooms");
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31 local get_room_from_jid = rawget(mod_muc, "get_room_from_jid") or
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32 function (jid)
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33 return rooms[jid];
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34 end
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35
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36 -- I believe the origins of this template to be in the public domain as per
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37 -- https://github.com/badges/shields/blob/master/LICENSE.md
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38 local template = module:get_option_string("badge_template", [[
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39 <?xml version="1.0"?>
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40 <svg xmlns="http://www.w3.org/2000/svg" width="{width}" height="20">
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41 <linearGradient id="b" x2="0" y2="100%">
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42 <stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
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43 <stop offset="1" stop-opacity=".1"/>
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44 </linearGradient>
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45 <clipPath id="a">
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46 <rect width="{width}" height="20" rx="3" fill="#fff"/>
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47 </clipPath>
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48 <g clip-path="url(#a)">
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49 <path fill="#555" d="M0 0h{labelwidth}v20H0z"/>
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50 <path fill="#fe7d37" d="M{labelwidth} 0h{countwidth}v20H{labelwidth}z"/>
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51 <path fill="url(#b)" d="M0 0h{width}v20H0z"/>
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52 </g>
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53 <g fill="#fff" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11" xml:space="preserve">
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54 <text fill="#010101" fill-opacity=".3" y="14" x="0" textLength="{labelwidth}">{label}</text>
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55 <text y="13" x="0" textLength="{labelwidth}">{label}</text>
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56 <text fill="#010101" fill-opacity=".3" y="14" x="{labelwidth}" textLength="{countwidth}">{number}</text>
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57 <text y="13" x="{labelwidth}" textLength="{countwidth}">{number}</text>
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58 </g>
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59 </svg>
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60 ]]);
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61 template = assert(require "util.template"(template));
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62
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63 local number = module:get_option_string("badge_count", "%d online");
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64 local charwidth = 7;
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65
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66 module:provides("http", {
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67 route = {
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68 ["GET /*"] = function (event, path)
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69 local jid = jid_prep(path);
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70 if not jid then return end
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71
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72 local room = get_room_from_jid(jid);
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73 if not room then return end
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74 if (room.get_hidden or room.is_hidden)(room) then return end
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75
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76 local count = 0;
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77 for _ in pairs(room._occupants) do
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78 count = count + 1;
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79 end
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80 local badge_label = (" %s "):format(room:get_name() or jid_split(jid));
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81 local badge_count = (" %s "):format(string.format(number, count));
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82
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83 local response = event.response;
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84 response.headers.content_type = "image/svg+xml";
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85 local svg = [[<?xml version="1.0"?>]] ..
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86 tostring(template.apply({
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87 label = badge_label;
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88 number = badge_count;
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89 width = ("%d"):format( (#badge_label + #badge_count) * charwidth );
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90 labelwidth = ("%d"):format( #badge_label * charwidth );
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91 countwidth = ("%d"):format( #badge_count * charwidth );
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92 }));
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93 return svg;
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94 end;
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95 }
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96 });