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annotate mod_pastebin/mod_pastebin.lua @ 3029:7878dc2dbf59

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mod_pastebin: Avoid using pattern matching facilities for simple prefix removal
author Kim Alvefur <zash@zash.se>
date Sun, 20 May 2018 17:51:08 +0200
parents ded630a87563
children 4a7f08fe793c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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2 local st = require "util.stanza";
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3 module:depends("http");
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4 local uuid_new = require "util.uuid".generate;
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5 local os_time = os.time;
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6 local t_insert, t_remove = table.insert, table.remove;
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7 local add_task = require "util.timer".add_task;
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8 local jid_bare = require "util.jid".bare;
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9 local muc_rooms;
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10 local is_component = module:get_host_type() == "component";
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11 if is_component then
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12 muc_rooms = module:depends "muc".rooms;
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13 end
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14
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15 local utf8_pattern = "[\194-\244][\128-\191]*$";
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16 local function drop_invalid_utf8(seq)
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17 local start = seq:byte();
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18 module:log("debug", "utf8: %d, %d", start, #seq);
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19 if (start <= 223 and #seq < 2)
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20 or (start >= 224 and start <= 239 and #seq < 3)
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21 or (start >= 240 and start <= 244 and #seq < 4)
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22 or (start > 244) then
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23 return "";
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24 end
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25 return seq;
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26 end
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27
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28 local function utf8_length(str)
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29 local _, count = string.gsub(str, "[^\128-\193]", "");
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30 return count;
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31 end
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32
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33 local pastebin_private_messages = module:get_option_boolean("pastebin_private_messages", not is_component);
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34 local length_threshold = module:get_option_number("pastebin_threshold", 500);
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35 local line_threshold = module:get_option_number("pastebin_line_threshold", 4);
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36 local max_summary_length = module:get_option_number("pastebin_summary_length", 150);
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37 local html_preview = module:get_option_boolean("pastebin_html_preview", true);
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38
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39 local base_url = module:get_option_string("pastebin_url", module:http_url()):gsub("/$", "").."/";
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40
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41 -- Seconds a paste should live for in seconds (config is in hours), default 24 hours
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42 local expire_after = math.floor(module:get_option_number("pastebin_expire_after", 24) * 3600);
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43
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44 local trigger_string = module:get_option_string("pastebin_trigger");
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45 trigger_string = (trigger_string and trigger_string .. " ");
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46
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47 local pastes = {};
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48 local default_headers = { ["Content-Type"] = "text/plain; charset=utf-8" };
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49
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50 local xmlns_xhtmlim = "http://jabber.org/protocol/xhtml-im";
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51 local xmlns_xhtml = "http://www.w3.org/1999/xhtml";
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52
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53 function pastebin_text(text)
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54 local uuid = uuid_new();
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55 pastes[uuid] = { body = text, time = os_time(), headers = default_headers };
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56 pastes[#pastes+1] = uuid;
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57 if not pastes[2] then -- No other pastes, give the timer a kick
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58 add_task(expire_after, expire_pastes);
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59 end
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60 return base_url..uuid;
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61 end
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62
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63 function handle_request(event, pasteid)
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64 if not pasteid or not pastes[pasteid] then
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65 event.response.headers = default_headers;
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66 return event.response:send("Invalid paste id, perhaps it expired?");
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67 end
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68
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69 --module:log("debug", "Received request, replying: %s", pastes[pasteid].text);
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70
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71 return pastes[pasteid];
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72 end
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73
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74 local function replace_tag(s, replacement)
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75 local once = false;
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76 s:maptags(function (tag)
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77 if tag.name == replacement.name and tag.attr.xmlns == replacement.attr.xmlns then
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78 if not once then
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79 once = true;
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80 return replacement;
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81 else
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82 return nil;
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83 end
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84 end
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85 return tag;
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86 end);
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87 if not once then
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88 s:add_child(replacement);
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89 end
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90 end
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91
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92 function check_message(data)
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93 local origin, stanza = data.origin, data.stanza;
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94
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95 -- Only check for MUC presence when loaded on a component.
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96 if is_component then
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97 local room = muc_rooms[jid_bare(stanza.attr.to)];
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98 if not room then return; end
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99
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100 local nick = room._jid_nick[stanza.attr.from];
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101 if not nick then return; end
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102 end
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103
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104 local body = stanza:get_child_text();
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105
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106 if not body then return; end
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107
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108 --module:log("debug", "Body(%s) length: %d", type(body), #(body or ""));
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109
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110 if body and (
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111 ((#body > length_threshold)
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112 and (utf8_length(body) > length_threshold)) or
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113 (trigger_string and body:find(trigger_string, 1, true) == 1) or
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114 (select(2, body:gsub("\n", "%0")) >= line_threshold)
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115 ) then
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116 if trigger_string and body:sub(1, #trigger_string) == trigger_string then
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117 body = body:sub(#trigger_string+1);
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118 end
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119 local url = pastebin_text(body);
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120 module:log("debug", "Pasted message as %s", url);
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121 --module:log("debug", " stanza[bodyindex] = %q", tostring( stanza[bodyindex]));
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122 local summary = (body:sub(1, max_summary_length):gsub(utf8_pattern, drop_invalid_utf8) or ""):match("[^\n]+") or "";
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123 summary = summary:match("^%s*(.-)%s*$");
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124 local summary_prefixed = summary:match("[,:]$");
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125 replace_tag(stanza, st.stanza("body"):text(summary));
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Florian Zeitz <florob@babelmonkeys.de>
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126
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127 if html_preview then
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128 local line_count = select(2, body:gsub("\n", "%0")) + 1;
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129 local link_text = ("[view %spaste (%d line%s)]"):format(summary_prefixed and "" or "rest of ", line_count, line_count == 1 and "" or "s");
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130 local html = st.stanza("html", { xmlns = xmlns_xhtmlim }):tag("body", { xmlns = xmlns_xhtml });
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131 html:tag("p"):text(summary.." "):up();
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132 html:tag("a", { href = url }):text(link_text):up();
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Kim Alvefur <zash@zash.se>
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133 replace_tag(stanza, html);
446
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134 end
5
9c1c6c5344dc mod_pastebin: Initial commit
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parents:
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135 end
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parents:
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136 end
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parents:
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137
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parents:
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138 module:hook("message/bare", check_message);
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139 if pastebin_private_messages then
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parents: 190
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140 module:hook("message/full", check_message);
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parents: 190
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141 end
5
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parents:
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142
24
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143 function expire_pastes(time)
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parents: 23
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144 time = time or os_time(); -- COMPAT with 0.5
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parents: 23
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145 if pastes[1] then
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parents: 23
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146 pastes[pastes[1]] = nil;
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parents: 23
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147 t_remove(pastes, 1);
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parents: 23
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148 if pastes[1] then
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parents: 23
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149 return (expire_after - (time - pastes[pastes[1]].time)) + 1;
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parents: 23
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150 end
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parents: 23
diff changeset
151 end
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parents: 23
diff changeset
152 end
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parents: 23
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153
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Matthew Wild <mwild1@gmail.com>
parents: 23
diff changeset
154
654
7e444de959bb mod_pastebin: Update to the new HTTP API
Kim Alvefur <zash@zash.se>
parents: 565
diff changeset
155 module:provides("http", {
7e444de959bb mod_pastebin: Update to the new HTTP API
Kim Alvefur <zash@zash.se>
parents: 565
diff changeset
156 route = {
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Kim Alvefur <zash@zash.se>
parents: 565
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157 ["GET /*"] = handle_request;
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Kim Alvefur <zash@zash.se>
parents: 565
diff changeset
158 };
7e444de959bb mod_pastebin: Update to the new HTTP API
Kim Alvefur <zash@zash.se>
parents: 565
diff changeset
159 });
454
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parents: 446
diff changeset
160
517
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parents: 516
diff changeset
161 local function set_pastes_metatable()
516
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
162 if expire_after == 0 then
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Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
163 local dm = require "util.datamanager";
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parents: 514
diff changeset
164 setmetatable(pastes, {
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parents: 514
diff changeset
165 __index = function (pastes, id)
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parents: 514
diff changeset
166 if type(id) == "string" then
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parents: 514
diff changeset
167 return dm.load(id, module.host, "pastebin");
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parents: 514
diff changeset
168 end
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
169 end;
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Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
170 __newindex = function (pastes, id, data)
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Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
171 if type(id) == "string" then
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
172 dm.store(id, module.host, "pastebin", data);
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
173 end
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
174 end;
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
175 });
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
176 else
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Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
177 setmetatable(pastes, nil);
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
178 end
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
179 end
3d3687fef751 mod_pastebin: Fix issue with metatable not being set when a reload changes expires_after to 0
Matthew Wild <mwild1@gmail.com>
parents: 514
diff changeset
180
517
f866325305ed mod_pastebin: Make last commit work (also set on restore)
Matthew Wild <mwild1@gmail.com>
parents: 516
diff changeset
181 module.load = set_pastes_metatable;
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parents: 516
diff changeset
182
454
3f101f7a26d0 mod_pastebin: Preserve pastes through a reload
Matthew Wild <mwild1@gmail.com>
parents: 446
diff changeset
183 function module.save()
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parents: 446
diff changeset
184 return { pastes = pastes };
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parents: 446
diff changeset
185 end
3f101f7a26d0 mod_pastebin: Preserve pastes through a reload
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parents: 446
diff changeset
186
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parents: 446
diff changeset
187 function module.restore(data)
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parents: 446
diff changeset
188 pastes = data.pastes or pastes;
517
f866325305ed mod_pastebin: Make last commit work (also set on restore)
Matthew Wild <mwild1@gmail.com>
parents: 516
diff changeset
189 set_pastes_metatable();
454
3f101f7a26d0 mod_pastebin: Preserve pastes through a reload
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parents: 446
diff changeset
190 end