view mod_muc_restrict_media/mod_muc_restrict_media.lua @ 5516:f25df3af02c1

mod_client_management: Include client software version number in listing Should you ever wish to revoke a client by version number, e.g. for security reasons affecting certain versions, then it would be good to at the very least see which version is used. Also includes the OAuth2 software ID, an optional unique identifier that should be the same for all installations of a particular software.
author Kim Alvefur <zash@zash.se>
date Sat, 03 Jun 2023 19:21:39 +0200
parents 1682166171ff
children
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module:depends"muc";

local restrict_by_default = module:get_option_boolean("muc_room_default_restrict_media", true);

local function should_restrict_media(room)
	local restrict_media = room._data.restrict_media;
	if restrict_media == nil then
		restrict_media = restrict_by_default;
	end
	return restrict_media;
end

module:hook("muc-config-form", function(event)
	local room, form = event.room, event.form;
	table.insert(form, {
		name = "{xmpp:prosody.im}muc#roomconfig_unaffiliated_media",
		type = "boolean",
		label = "Display inline media (images, etc.) from non-members",
		value = not should_restrict_media(room),
	});
end);

module:hook("muc-config-submitted", function(event)
	local room, fields, changed = event.room, event.fields, event.changed;
	local new_restrict_media = not fields["{xmpp:prosody.im}muc#roomconfig_unaffiliated_media"];
	if new_restrict_media ~= should_restrict_media(room) then
		if new_restrict_media == restrict_by_default then
			room._data.restrict_media = nil;
		else
			room._data.restrict_media = new_restrict_media;
		end
		if type(changed) == "table" then
			changed["{xmpp:prosody.im}muc#roomconfig_unaffiliated_media"] = true;
		else
			event.changed = true;
		end
	end
end);

module:hook("muc-disco#info", function (event)
	local room, form, formdata = event.room, event.form, event.formdata;

	local allow_unaffiliated_media = not should_restrict_media(room);
	table.insert(form, {
		name = "{xmpp:prosody.im}muc#roomconfig_unaffiliated_media",
		type = "boolean",
	});
	formdata["{xmpp:prosody.im}muc#roomconfig_unaffiliated_media"] = allow_unaffiliated_media;
end);

local function strip_xhtml_img(tag)
	if tag.attr.xmlns == "http://www.w3.org/1999/xhtml" and tag.name == "img" then
		tag.name = "i";
		tag:text(tag.attr.alt or "<image blocked>");
		tag.attr = { xmlns = tag.attr.xmlns, title = tag.attr.title };
		tag:maptags(strip_xhtml_img);
	else
		tag:maptags(strip_xhtml_img);
	end

	return tag;
end

local function filter_media_tags(tag)
	local xmlns = tag.attr.xmlns;
	if xmlns == "jabber:x:oob" then
		return nil;
	elseif xmlns == "urn:xmpp:reference:0" then
		if tag:get_child("media-sharing", "urn:xmpp:sims:1") then
			return nil;
		end
	elseif xmlns == "http://jabber.org/protocol/xhtml-im" then
		return strip_xhtml_img(tag);
	end
	return tag;
end

module:hook("muc-occupant-groupchat", function (event)
	local stanza = event.stanza;
	if stanza.attr.type ~= "groupchat" then return; end
	if event.room:get_affiliation(stanza.attr.from) then return end
	if should_restrict_media(event.room) then
		stanza:maptags(filter_media_tags);
	end
end, 20);