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annotate mod_ogp/mod_ogp.lua @ 5468:14b5446e22e1

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mod_http_oauth2: Fix returning errors from response handlers This would either redirect the user back to the client along with the error code, or show the error HTML template. Previously this would just show some JSON to the user.
author Kim Alvefur <zash@zash.se>
date Thu, 18 May 2023 12:57:23 +0200
parents 09f0911c735d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 allowlist = module:get_option_set("ogp_domain_allowlist", module:get_option_set("ogp_domain_whitelist", {}))
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9 local denylist = module:get_option_set("ogp_domain_denylist", {})
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10
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11
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12 local function is_allowed(domain)
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13 if allowlist:empty() then
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14 return true
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15 end
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16 if allowlist: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 local function is_denied(domain)
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23 if denylist:empty() then
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24 return false
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25 end
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26 if denylist:contains(domain) then
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27 return true
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28 end
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29 return false
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30 end
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31
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32
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33 local function fetch_ogp_data(room, url, origin_id)
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34 if not url then
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35 return;
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36 end
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37
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38 local domain = url:match(domain_pattern);
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39 if is_denied(domain) or not is_allowed(domain) then
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40 return;
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41 end
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42
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43 http.request(
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44 url,
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45 nil,
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46 function(response_body, response_code, _)
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47 if response_code ~= 200 then
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48 module:log("debug", "Call to %s returned code %s and body %s", url, response_code, response_body)
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49 return
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50 end
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51
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52 local to = room.jid
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53 local from = room and room.jid or module.host
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54 local fastening = st.message({to = to, from = from, type = 'groupchat'}):tag("apply-to", {xmlns = xmlns_fasten, id = origin_id})
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55 local found_metadata = false
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56 local message_body = ""
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57
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58 local meta_pattern = [[<meta (.-)/?>]]
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59 for match in response_body:gmatch(meta_pattern) do
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60 local property = match:match([[property=%s*["']?(og:.-)["']?%s]])
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61 if not property then
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62 property = match:match([[property=["']?(og:.-)["']$]])
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63 end
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64
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65 local content = match:match([[content=%s*["'](.-)["']%s]])
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66 if not content then
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67 content = match:match([[content=["']?(.-)["']$]])
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68 end
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69 if not content then
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70 content = match:match([[content=(.-) property]])
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71 end
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72 if not content then
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73 content = match:match([[content=(.-)$]])
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74 end
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75
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76 if property and content then
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77 module:log("debug", property .. "\t" .. content)
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78 fastening:tag(
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79 "meta",
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80 {
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81 xmlns = xmlns_xhtml,
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82 property = property,
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83 content = content
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84 }
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85 ):up()
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86 found_metadata = true
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87 message_body = message_body .. property .. "\t" .. content .. "\n"
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88 end
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89 end
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90
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91 if found_metadata then
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92 mod_muc.get_room_from_jid(room.jid):broadcast_message(fastening)
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93 end
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94 module:log("debug", tostring(fastening))
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95 end
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96 )
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97 end
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98
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99 local function ogp_handler(event)
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100 local room, stanza = event.room, st.clone(event.stanza)
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101 local body = stanza:get_child_text("body")
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102
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103 if not body then return; end
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104
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105 local origin_id = stanza:find("{urn:xmpp:sid:0}origin-id@id")
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106 if not origin_id then return; end
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107
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108 for url in body:gmatch(url_pattern) do
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109 fetch_ogp_data(room, url, origin_id);
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110 end
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111 end
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112
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113 module:hook("muc-occupant-groupchat", ogp_handler)
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114
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115
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116 module:hook("muc-message-is-historic", function (event)
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117 local fastening = event.stanza:get_child('apply-to', xmlns_fasten)
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118 if fastening and fastening:get_child('meta', xmlns_xhtml) then
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119 return true
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120 end
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121 end);