prosody-modules
3aa5419e3576
mod_bob/mod_bob.lua

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mod_bob/mod_bob.lua @ 3342:3aa5419e3576

mod_bob: Add this new module.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Fri, 28 Sep 2018 16:12:18 +0200
child 3343:2e65160187a4
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3342
3aa5419e3576 mod_bob: Add this new module.
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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 encodings = require "util.encodings";
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5 local b64_encode = encodings.base64.encode;
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6 local b64_decode = encodings.base64.decode;
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7 local sha1 = require"util.hashes".sha1;
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8
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9 -- TODO: Move that to storage.
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10 local cache = {};
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11 -- TODO: use util.cache for this.
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12 local in_flight = {};
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13
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14 local function check_cid(src)
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15 -- TODO: figure out why ^ can’t be used at the beginning of the pattern.
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16 for cid in src:gmatch("cid:(%w+%+%w+@bob%.xmpp%.org)$") do
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17 return cid;
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18 end
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19 return nil;
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20 end
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21
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22 local function handle_data_carrier(tag)
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23 if tag.name ~= "data" or tag.attr.xmlns ~= "urn:xmpp:bob" then
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24 return tag;
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25 end
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26 local cid = tag.attr.cid;
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27 local media_type = tag.attr.type;
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28 local max_age = tag.attr['max-age'];
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29 local b64_content = tag:get_text();
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30 local content = b64_decode(b64_content);
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31 local hash = sha1(content, true);
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32 if cid ~= "sha1+"..hash.."@bob.xmpp.org" then
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33 module:log("debug", "Invalid BoB cid, %s ~= %s", cid, "sha1+"..hash.."@bob.xmpp.org");
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34 return nil;
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35 end
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36 cache[cid] = { media_type = media_type, max_age = max_age, content = content };
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37 if in_flight[cid] then
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38 local iq = st.iq({ type = "result", id = "fixme" });
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39 iq:add_direct_child(tag);
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40 for jid, data in pairs(in_flight[cid]) do
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41 iq.attr.from = data.from;
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42 iq.attr.to = jid;
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43 iq.attr.id = data.id;
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44 module:send(iq);
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45 end
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46 in_flight[cid] = nil;
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47 end
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48 return nil;
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49 end
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50
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51 local current_id = 0;
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52 local function send_iq(room_jid, jid, cid, log)
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53 local iq = st.iq({ type = "get", from = room_jid, to = jid, id = "bob-"..current_id })
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54 :tag("data", { xmlns = "urn:xmpp:bob", cid = cid });
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55 log("debug", "found BoB image in XHTML-IM, asking %s for cid %s", jid, cid);
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56 module:send(iq);
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57 in_flight[cid] = {};
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58 end
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59
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60 local function find_images(tag, jid, room_jid, log)
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61 if tag.name == "img" and tag.attr.xmlns == "http://www.w3.org/1999/xhtml" then
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62 local src = tag.attr.src;
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63 local cid = check_cid(src);
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64 if not cid then
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65 return;
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66 end
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67 if cache[cid] then
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68 log("debug", "cid %s already found in cache", cid);
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69 return;
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70 end
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71 if in_flight[cid] then
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72 log("debug", "cid %s already queried", cid);
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73 return;
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74 end
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75 send_iq(room_jid, jid, cid, log);
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76 return;
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77 end
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78 for child in tag:childtags(nil, "http://www.w3.org/1999/xhtml") do
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79 find_images(child, jid, room_jid, log);
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80 end
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81 end
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82
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83 local function message_handler(event)
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84 local stanza, origin = event.stanza, event.origin;
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85 local jid = stanza.attr.from;
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86 local room_jid = stanza.attr.to;
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87 local log = origin.log or module._log;
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88
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89 -- Remove and cache all <data/> elements embedded here.
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90 stanza:maptags(handle_data_carrier);
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91
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92 -- Find and query all of the cids not already cached.
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93 local tag = stanza:get_child("html", "http://jabber.org/protocol/xhtml-im");
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94 for body in tag:childtags("body", "http://www.w3.org/1999/xhtml") do
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95 find_images(body, jid, room_jid, log);
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96 end
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97 end
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98
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99 local function handle_data_get(stanza, cid, log)
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100 local data = cache[cid];
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101 if not data then
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102 log("debug", "BoB requested for data not in cache (cid %s), falling through.", cid);
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103 if in_flight[cid] then
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104 log("debug", "But an iq has already been sent, let’s wait…");
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105 in_flight[cid][stanza.attr.from] = { id = stanza.attr.id, from = stanza.attr.to };
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106 return true;
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107 end
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108 return nil;
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109 end
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110
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111 local iq = st.reply(stanza);
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112 iq:text_tag("data", b64_encode(data.content), {
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113 xmlns = "urn:xmpp:bob",
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114 cid = cid,
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115 type = data.media_type,
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116 ['max-age'] = data.max_age,
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117 });
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118 log("debug", "Answering BoB request for cid %s on the behalf of %s", cid, stanza.attr.to);
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119 module:send(iq);
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120 return true;
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121 end
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122
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123 local function iq_handler(event)
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124 local stanza, origin = event.stanza, event.origin;
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125 local tag = stanza.tags[1];
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126 if tag.name ~= "data" or tag.attr.xmlns ~= "urn:xmpp:bob" then
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127 return nil;
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128 end
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129 local log = origin.log or module._log;
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130 local cid = tag.attr.cid;
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131 if not cid then
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132 log("debug", "BoB iq doesn’t contain a cid attribute.");
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133 return;
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134 end
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135 if stanza.attr.type == "get" then
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136 return handle_data_get(stanza, cid, log);
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137 elseif stanza.attr.type == "result" then
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138 handle_data_carrier(tag);
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139 return true;
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140 end
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141 -- TODO: also handle error iqs.
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142 end
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143
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144 module:hook("message/bare", message_handler, 1);
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145 module:hook("iq/full", iq_handler, 1);
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146 module:hook("iq/bare", iq_handler, 1);