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annotate mod_ogp/mod_ogp.lua @ 4537:53ee391ca689

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mod_smacks: Fix traceback due to session being destroyed in send() Sending something can cause the OS to notice that the connection is dead and then the connection can be dead at this point. More likely if opportunistic_writes is enabled.
author Kim Alvefur <zash@zash.se>
date Thu, 01 Apr 2021 11:35:26 +0200
parents 0136c98f574c
children 09f0911c735d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local mod_muc = module:depends("muc")
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2 local http = require "net.http"
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3 local st = require "util.stanza"
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4 local url_pattern = [[https?://%S+]]
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5 local domain_pattern = '^%w+://([^/]+)'
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6 local xmlns_fasten = "urn:xmpp:fasten:0"
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7 local xmlns_xhtml = "http://www.w3.org/1999/xhtml"
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8 local whitelist = module:get_option_set("ogp_domain_whitelist", {})
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9
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10
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11 local function is_whitelisted(url)
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12 if whitelist:empty() then
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13 return true
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14 end
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15 local domain = url:match(domain_pattern)
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16 if whitelist:contains(domain) then
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17 return true;
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18 end
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19 return false
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20 end
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21
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22
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23 local function fetch_ogp_data(room, url, origin_id)
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24 if not url or not is_whitelisted(url) then
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25 return;
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26 end
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27
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28 http.request(
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29 url,
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30 nil,
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31 function(response_body, response_code, _)
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32 if response_code ~= 200 then
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33 module:log("debug", "Call to %s returned code %s and body %s", url, response_code, response_body)
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34 return
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35 end
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36
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37 local to = room.jid
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38 local from = room and room.jid or module.host
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39 local fastening = st.message({to = to, from = from, type = 'groupchat'}):tag("apply-to", {xmlns = xmlns_fasten, id = origin_id})
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40 local found_metadata = false
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41 local message_body = ""
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42
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43 local meta_pattern = [[<meta (.-)/?>]]
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44 for match in response_body:gmatch(meta_pattern) do
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45 local property = match:match([[property=%s*["']?(og:.-)["']?%s]])
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46 if not property then
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47 property = match:match([[property=["']?(og:.-)["']$]])
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48 end
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49
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50 local content = match:match([[content=%s*["'](.-)["']%s]])
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51 if not content then
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52 content = match:match([[content=["']?(.-)["']$]])
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53 end
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54 if not content then
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55 content = match:match([[content=(.-) property]])
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56 end
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57 if not content then
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58 content = match:match([[content=(.-)$]])
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59 end
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60
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61 if property and content then
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62 module:log("debug", property .. "\t" .. content)
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63 fastening:tag(
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64 "meta",
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65 {
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66 xmlns = xmlns_xhtml,
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67 property = property,
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68 content = content
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69 }
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70 ):up()
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71 found_metadata = true
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72 message_body = message_body .. property .. "\t" .. content .. "\n"
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73 end
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74 end
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75
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76 if found_metadata then
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77 mod_muc.get_room_from_jid(room.jid):broadcast_message(fastening)
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78 end
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79 module:log("debug", tostring(fastening))
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80 end
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81 )
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82 end
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83
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84 local function ogp_handler(event)
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85 local room, stanza = event.room, st.clone(event.stanza)
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86 local body = stanza:get_child_text("body")
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87
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88 if not body then return; end
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89
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90 local origin_id = stanza:find("{urn:xmpp:sid:0}origin-id@id")
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91 if not origin_id then return; end
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92
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93 for url in body:gmatch(url_pattern) do
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94 fetch_ogp_data(room, url, origin_id);
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95 end
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96 end
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97
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98 module:hook("muc-occupant-groupchat", ogp_handler)
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99
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100
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101 module:hook("muc-message-is-historic", function (event)
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102 local fastening = event.stanza:get_child('apply-to', xmlns_fasten)
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103 if fastening and fastening:get_child('meta', xmlns_xhtml) then
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104 return true
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105 end
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106 end);