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annotate mod_pastebin/mod_pastebin.lua @ 1954:050cd7b6fa96

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mod_muc_access_control: Module to allow restricting rooms to a list of JIDs, which can include domains
author Matthew Wild <mwild1@gmail.com>
date Sun, 22 Nov 2015 19:33:09 +0000
parents 7dbde05b48a9
children 314cebb3071e
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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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9 local utf8_pattern = "[\194-\244][\128-\191]*$";
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10 local function drop_invalid_utf8(seq)
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11 local start = seq:byte();
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12 module:log("debug", "utf8: %d, %d", start, #seq);
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13 if (start <= 223 and #seq < 2)
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14 or (start >= 224 and start <= 239 and #seq < 3)
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15 or (start >= 240 and start <= 244 and #seq < 4)
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16 or (start > 244) then
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17 return "";
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18 end
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19 return seq;
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20 end
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22 local function utf8_length(str)
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23 local _, count = string.gsub(str, "[^\128-\193]", "");
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24 return count;
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25 end
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27 local pastebin_private_messages = module:get_option_boolean("pastebin_private_messages", hosts[module.host].type ~= "component");
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28 local length_threshold = module:get_option_number("pastebin_threshold", 500);
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29 local line_threshold = module:get_option_number("pastebin_line_threshold", 4);
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30 local max_summary_length = module:get_option_number("pastebin_summary_length", 150);
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31 local html_preview = module:get_option_boolean("pastebin_html_preview", true);
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33 local base_url = module:get_option_string("pastebin_url", module:http_url()):gsub("/$", "").."/";
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35 -- Seconds a paste should live for in seconds (config is in hours), default 24 hours
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36 local expire_after = math.floor(module:get_option_number("pastebin_expire_after", 24) * 3600);
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37
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38 local trigger_string = module:get_option_string("pastebin_trigger");
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39 trigger_string = (trigger_string and trigger_string .. " ");
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41 local pastes = {};
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42 local default_headers = { ["Content-Type"] = "text/plain; charset=utf-8" };
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44 local xmlns_xhtmlim = "http://jabber.org/protocol/xhtml-im";
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45 local xmlns_xhtml = "http://www.w3.org/1999/xhtml";
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47 function pastebin_text(text)
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48 local uuid = uuid_new();
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49 pastes[uuid] = { body = text, time = os_time(), headers = default_headers };
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50 pastes[#pastes+1] = uuid;
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51 if not pastes[2] then -- No other pastes, give the timer a kick
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52 add_task(expire_after, expire_pastes);
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53 end
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54 return base_url..uuid;
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55 end
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57 function handle_request(event, pasteid)
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58 if not pasteid or not pastes[pasteid] then
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59 event.response.headers = default_headers;
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60 return event.response:send("Invalid paste id, perhaps it expired?");
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61 end
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63 --module:log("debug", "Received request, replying: %s", pastes[pasteid].text);
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64
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65 return pastes[pasteid];
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66 end
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68 function check_message(data)
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69 local origin, stanza = data.origin, data.stanza;
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71 local body, bodyindex, htmlindex;
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72 for k,v in ipairs(stanza) do
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73 if v.name == "body" then
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74 body, bodyindex = v, k;
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75 elseif v.name == "html" and v.attr.xmlns == xmlns_xhtmlim then
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76 htmlindex = k;
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77 end
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78 end
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79
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80 if not body then return; end
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81 body = body:get_text();
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82
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83 --module:log("debug", "Body(%s) length: %d", type(body), #(body or ""));
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84
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85 if body and (
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86 ((#body > length_threshold)
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87 and (utf8_length(body) > length_threshold)) or
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88 (trigger_string and body:find(trigger_string, 1, true) == 1) or
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89 (select(2, body:gsub("\n", "%0")) >= line_threshold)
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90 ) then
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91 if trigger_string then
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92 body = body:gsub("^" .. trigger_string, "", 1);
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93 end
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94 local url = pastebin_text(body);
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95 module:log("debug", "Pasted message as %s", url);
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96 --module:log("debug", " stanza[bodyindex] = %q", tostring( stanza[bodyindex]));
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97 local summary = (body:sub(1, max_summary_length):gsub(utf8_pattern, drop_invalid_utf8) or ""):match("[^\n]+") or "";
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98 summary = summary:match("^%s*(.-)%s*$");
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99 local summary_prefixed = summary:match("[,:]$");
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100 stanza[bodyindex][1] = (summary_prefixed and (summary.." ") or "")..url;
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101
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102 if html_preview then
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103 local line_count = select(2, body:gsub("\n", "%0")) + 1;
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104 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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105 local html = st.stanza("html", { xmlns = xmlns_xhtmlim }):tag("body", { xmlns = xmlns_xhtml });
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106 html:tag("p"):text(summary.." "):up();
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107 html:tag("a", { href = url }):text(link_text):up();
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108 stanza[htmlindex or #stanza+1] = html;
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109 end
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110 end
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111 end
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112
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113 module:hook("message/bare", check_message);
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114 if pastebin_private_messages then
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115 module:hook("message/full", check_message);
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116 end
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117
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118 function expire_pastes(time)
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119 time = time or os_time(); -- COMPAT with 0.5
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120 if pastes[1] then
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121 pastes[pastes[1]] = nil;
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122 t_remove(pastes, 1);
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123 if pastes[1] then
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124 return (expire_after - (time - pastes[pastes[1]].time)) + 1;
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125 end
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126 end
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127 end
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128
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129
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130 module:provides("http", {
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131 route = {
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132 ["GET /*"] = handle_request;
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133 };
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134 });
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135
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136 local function set_pastes_metatable()
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137 if expire_after == 0 then
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138 local dm = require "util.datamanager";
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139 setmetatable(pastes, {
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140 __index = function (pastes, id)
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141 if type(id) == "string" then
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142 return dm.load(id, module.host, "pastebin");
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143 end
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144 end;
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145 __newindex = function (pastes, id, data)
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146 if type(id) == "string" then
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147 dm.store(id, module.host, "pastebin", data);
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148 end
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149 end;
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150 });
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151 else
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152 setmetatable(pastes, nil);
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153 end
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154 end
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155
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156 module.load = set_pastes_metatable;
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157
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158 function module.save()
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159 return { pastes = pastes };
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160 end
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161
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162 function module.restore(data)
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163 pastes = data.pastes or pastes;
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164 set_pastes_metatable();
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165 end