Mercurial > prosody-modules
annotate mod_bob/mod_bob.lua @ 3569:cc4f7361dac7
mod_bidi: Document compatibility with 0.10 and 0.11
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 22 Apr 2019 04:20:16 +0200 |
parents | 76fc915647ab |
children | 41fbed2de482 |
rev | line source |
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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 return src:match("^cid:(%w+%+%w+@bob%.xmpp%.org)$"); |
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16 end |
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17 |
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18 local function handle_data_carrier(tag) |
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19 if tag.name ~= "data" or tag.attr.xmlns ~= "urn:xmpp:bob" then |
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20 return tag; |
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21 end |
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22 local cid = tag.attr.cid; |
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23 local media_type = tag.attr.type; |
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24 local max_age = tag.attr['max-age']; |
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25 local b64_content = tag:get_text(); |
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26 local content = b64_decode(b64_content); |
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27 local hash = sha1(content, true); |
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28 if cid ~= "sha1+"..hash.."@bob.xmpp.org" then |
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29 module:log("debug", "Invalid BoB cid, %s ~= %s", cid, "sha1+"..hash.."@bob.xmpp.org"); |
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30 return nil; |
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31 end |
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32 cache[cid] = { media_type = media_type, max_age = max_age, content = content }; |
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33 if in_flight[cid] then |
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34 local iq = st.iq({ type = "result", id = "fixme" }); |
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35 iq:add_direct_child(tag); |
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36 for jid, data in pairs(in_flight[cid]) do |
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37 iq.attr.from = data.from; |
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38 iq.attr.to = jid; |
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39 iq.attr.id = data.id; |
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40 module:send(iq); |
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41 end |
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42 in_flight[cid] = nil; |
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43 end |
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44 return nil; |
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45 end |
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46 |
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47 local current_id = 0; |
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48 local function send_iq(room_jid, jid, cid, log) |
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49 local iq = st.iq({ type = "get", from = room_jid, to = jid, id = "bob-"..current_id }) |
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50 :tag("data", { xmlns = "urn:xmpp:bob", cid = cid }); |
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51 log("debug", "found BoB image in XHTML-IM, asking %s for cid %s", jid, cid); |
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52 module:send(iq); |
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53 in_flight[cid] = {}; |
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54 end |
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55 |
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56 local function find_images(tag, jid, room_jid, log) |
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57 if tag.name == "img" and tag.attr.xmlns == "http://www.w3.org/1999/xhtml" then |
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58 local src = tag.attr.src; |
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59 local cid = check_cid(src); |
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60 if not cid then |
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61 return; |
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62 end |
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63 if cache[cid] then |
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64 log("debug", "cid %s already found in cache", cid); |
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65 return; |
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66 end |
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67 if in_flight[cid] then |
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68 log("debug", "cid %s already queried", cid); |
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69 return; |
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70 end |
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71 send_iq(room_jid, jid, cid, log); |
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72 return; |
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73 end |
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74 for child in tag:childtags(nil, "http://www.w3.org/1999/xhtml") do |
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75 find_images(child, jid, room_jid, log); |
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76 end |
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77 end |
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78 |
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79 local function message_handler(event) |
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80 local stanza, origin = event.stanza, event.origin; |
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81 local jid = stanza.attr.from; |
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82 local room_jid = stanza.attr.to; |
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83 local log = origin.log or module._log; |
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84 |
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85 -- Remove and cache all <data/> elements embedded here. |
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86 stanza:maptags(handle_data_carrier); |
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87 |
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88 -- Find and query all of the cids not already cached. |
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89 local tag = stanza:get_child("html", "http://jabber.org/protocol/xhtml-im"); |
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90 if not tag then |
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91 return; |
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92 end |
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93 for body in tag:childtags("body", "http://www.w3.org/1999/xhtml") do |
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94 find_images(body, jid, room_jid, log); |
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95 end |
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96 end |
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97 |
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98 local function handle_data_get(stanza, cid, log) |
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99 local data = cache[cid]; |
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100 if not data then |
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101 log("debug", "BoB requested for data not in cache (cid %s), falling through.", cid); |
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102 if in_flight[cid] then |
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103 log("debug", "But an iq has already been sent, let’s wait…"); |
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104 in_flight[cid][stanza.attr.from] = { id = stanza.attr.id, from = stanza.attr.to }; |
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105 return true; |
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106 end |
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107 return nil; |
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108 end |
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109 |
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110 local iq = st.reply(stanza); |
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111 iq:text_tag("data", b64_encode(data.content), { |
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112 xmlns = "urn:xmpp:bob", |
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113 cid = cid, |
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114 type = data.media_type, |
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115 ['max-age'] = data.max_age, |
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116 }); |
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117 log("debug", "Answering BoB request for cid %s on the behalf of %s", cid, stanza.attr.to); |
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118 module:send(iq); |
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119 return true; |
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120 end |
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121 |
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122 local function iq_handler(event) |
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123 local stanza, origin = event.stanza, event.origin; |
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124 local tag = stanza.tags[1]; |
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125 if tag.name ~= "data" or tag.attr.xmlns ~= "urn:xmpp:bob" then |
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126 return nil; |
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127 end |
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128 local log = origin.log or module._log; |
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129 local cid = tag.attr.cid; |
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130 if not cid then |
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131 log("debug", "BoB iq doesn’t contain a cid attribute."); |
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132 return; |
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133 end |
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134 if stanza.attr.type == "get" then |
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135 return handle_data_get(stanza, cid, log); |
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136 elseif stanza.attr.type == "result" then |
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137 handle_data_carrier(tag); |
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138 return true; |
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139 end |
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140 -- TODO: also handle error iqs. |
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141 end |
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142 |
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143 module:hook("message/bare", message_handler, 1); |
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144 module:hook("iq/full", iq_handler, 1); |
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145 module:hook("iq/bare", iq_handler, 1); |