prosody-modules
2e33eeafe962
mod_ogp/mod_ogp.lua

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mod_ogp/mod_ogp.lua @ 4515:2e33eeafe962

mod_muc_markers: Prevent any markers from reaching the archive, even if untracked Original intention was to leave alone things that this module isn't handling. However markers in archives are just problematic without more advanced logic about what is markable and what is not. It also requires a more advanced query in mod_muc_rai to determine the latest markable message instead of the latest archived message. I'd rather keep the "is archivable" and "is markable" definition the same for simplicity. I don't want to introduce yet another set of rules for no reason. No markers in MAM.
author Matthew Wild <mwild1@gmail.com>
date Mon, 22 Mar 2021 15:55:02 +0000
parent 4504:0136c98f574c
child 4598:09f0911c735d
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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);