local mod_muc = module:depends("muc") local http = require "net.http" local st = require "util.stanza" local url_pattern = [[https?://%S+]] local domain_pattern = '^%w+://([^/]+)' local xmlns_fasten = "urn:xmpp:fasten:0" local xmlns_xhtml = "http://www.w3.org/1999/xhtml" local allowlist = module:get_option_set("ogp_domain_allowlist", module:get_option_set("ogp_domain_whitelist", {})) local denylist = module:get_option_set("ogp_domain_denylist", {}) local function is_allowed(domain) if allowlist:empty() then return true end if allowlist:contains(domain) then return true end return false end local function is_denied(domain) if denylist:empty() then return false end if denylist:contains(domain) then return true end return false end local function fetch_ogp_data(room, url, origin_id) if not url then return; end local domain = url:match(domain_pattern); if is_denied(domain) or not is_allowed(domain) then return; end http.request( url, nil, function(response_body, response_code, _) if response_code ~= 200 then module:log("debug", "Call to %s returned code %s and body %s", url, response_code, response_body) return end local to = room.jid local from = room and room.jid or module.host local fastening = st.message({to = to, from = from, type = 'groupchat'}):tag("apply-to", {xmlns = xmlns_fasten, id = origin_id}) local found_metadata = false local message_body = "" local meta_pattern = [[]] for match in response_body:gmatch(meta_pattern) do local property = match:match([[property=%s*["']?(og:.-)["']?%s]]) if not property then property = match:match([[property=["']?(og:.-)["']$]]) end local content = match:match([[content=%s*["'](.-)["']%s]]) if not content then content = match:match([[content=["']?(.-)["']$]]) end if not content then content = match:match([[content=(.-) property]]) end if not content then content = match:match([[content=(.-)$]]) end if property and content then module:log("debug", property .. "\t" .. content) fastening:tag( "meta", { xmlns = xmlns_xhtml, property = property, content = content } ):up() found_metadata = true message_body = message_body .. property .. "\t" .. content .. "\n" end end if found_metadata then mod_muc.get_room_from_jid(room.jid):broadcast_message(fastening) end module:log("debug", tostring(fastening)) end ) end local function ogp_handler(event) local room, stanza = event.room, st.clone(event.stanza) local body = stanza:get_child_text("body") if not body then return; end local origin_id = stanza:find("{urn:xmpp:sid:0}origin-id@id") if not origin_id then return; end for url in body:gmatch(url_pattern) do fetch_ogp_data(room, url, origin_id); end end module:hook("muc-occupant-groupchat", ogp_handler) module:hook("muc-message-is-historic", function (event) local fastening = event.stanza:get_child('apply-to', xmlns_fasten) if fastening and fastening:get_child('meta', xmlns_xhtml) then return true end end);