Diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/mod_bookmarks.lua	Tue Jan 04 23:04:14 2022 +0100
@@ -0,0 +1,407 @@
+local mm = require "core.modulemanager";
+if mm.get_modules_for_host(module.host):contains("bookmarks2") then
+	error("mod_bookmarks and mod_bookmarks2 are conflicting, please disable one of them.", 0);
+end
+
+local st = require "util.stanza";
+local jid_split = require "util.jid".split;
+
+local mod_pep = module:depends "pep";
+local private_storage = module:open_store("private", "map");
+
+local namespace = "urn:xmpp:bookmarks:1";
+local namespace_private = "jabber:iq:private";
+local namespace_legacy = "storage:bookmarks";
+
+local default_options = {
+	["persist_items"] = true;
+	["max_items"] = "max";
+	["send_last_published_item"] = "never";
+	["access_model"] = "whitelist";
+};
+
+if not mod_pep.check_node_config(nil, nil, default_options) then
+	-- 0.11 or earlier not supporting max_items="max" trows an error here
+	module:log("debug", "Setting max_items=pep_max_items because 'max' is not supported in this version");
+	default_options["max_items"] = module:get_option_number("pep_max_items", 256);
+end
+
+module:hook("account-disco-info", function (event)
+	-- This Time it’s Serious!
+	event.reply:tag("feature", { var = namespace.."#compat" }):up();
+	event.reply:tag("feature", { var = namespace.."#compat-pep" }):up();
+end);
+
+-- This must be declared on the domain JID, not the account JID.  Note that
+-- this isn’t defined in the XEP.
+module:add_feature(namespace_private);
+
+local function generate_legacy_storage(items)
+	local storage = st.stanza("storage", { xmlns = namespace_legacy });
+	for _, item_id in ipairs(items) do
+		local item = items[item_id];
+		local bookmark = item:get_child("conference", namespace);
+		local conference = st.stanza("conference", {
+			jid = item.attr.id,
+			name = bookmark.attr.name,
+			autojoin = bookmark.attr.autojoin,
+		});
+		local nick = bookmark:get_child_text("nick");
+		if nick ~= nil then
+			conference:text_tag("nick", nick):up();
+		end
+		local password = bookmark:get_child_text("password");
+		if password ~= nil then
+			conference:text_tag("password", password):up();
+		end
+		storage:add_child(conference);
+	end
+
+	return storage;
+end
+
+local function on_retrieve_legacy_pep(event)
+	local stanza, session = event.stanza, event.origin;
+	local pubsub = stanza:get_child("pubsub", "http://jabber.org/protocol/pubsub");
+	if pubsub == nil then
+		return;
+	end
+
+	local items = pubsub:get_child("items");
+	if items == nil then
+		return;
+	end
+
+	local node = items.attr.node;
+	if node ~= namespace_legacy then
+		return;
+	end
+
+	local username = session.username;
+	local jid = username.."@"..session.host;
+	local service = mod_pep.get_pep_service(username);
+	local ok, ret = service:get_items(namespace, session.full_jid);
+	if not ok then
+		module:log("error", "Failed to retrieve PEP bookmarks of %s: %s", jid, ret);
+		session.send(st.error_reply(stanza, "cancel", ret, "Failed to retrive bookmarks from PEP"));
+		return true;
+	end
+
+	local storage = generate_legacy_storage(ret);
+
+	module:log("debug", "Sending back legacy PEP for %s: %s", jid, storage);
+	session.send(st.reply(stanza)
+		:tag("pubsub", {xmlns = "http://jabber.org/protocol/pubsub"})
+			:tag("items", {node = namespace_legacy})
+				:tag("item", {id = "current"})
+					:add_child(storage));
+	return true;
+end
+
+local function on_retrieve_private_xml(event)
+	local stanza, session = event.stanza, event.origin;
+	local query = stanza:get_child("query", namespace_private);
+	if query == nil then
+		return;
+	end
+
+	local bookmarks = query:get_child("storage", namespace_legacy);
+	if bookmarks == nil then
+		return;
+	end
+
+	module:log("debug", "Getting private bookmarks: %s", bookmarks);
+
+	local username = session.username;
+	local jid = username.."@"..session.host;
+	local service = mod_pep.get_pep_service(username);
+	local ok, ret = service:get_items(namespace, session.full_jid);
+	if not ok then
+		if ret == "item-not-found" then
+			module:log("debug", "Got no PEP bookmarks item for %s, returning empty private bookmarks", jid);
+			session.send(st.reply(stanza):add_child(query));
+		else
+			module:log("error", "Failed to retrieve PEP bookmarks of %s: %s", jid, ret);
+			session.send(st.error_reply(stanza, "cancel", ret, "Failed to retrive bookmarks from PEP"));
+		end
+		return true;
+	end
+
+	local storage = generate_legacy_storage(ret);
+
+	module:log("debug", "Sending back private for %s: %s", jid, storage);
+	session.send(st.reply(stanza):query(namespace_private):add_child(storage));
+	return true;
+end
+
+local function compare_bookmark2(a, b)
+	if a == nil or b == nil then
+		return false;
+	end
+	local a_conference = a:get_child("conference", namespace);
+	local b_conference = b:get_child("conference", namespace);
+	local a_nick = a_conference:get_child_text("nick");
+	local b_nick = b_conference:get_child_text("nick");
+	local a_password = a_conference:get_child_text("password");
+	local b_password = b_conference:get_child_text("password");
+	return (a.attr.id == b.attr.id and
+	        a_conference.attr.name == b_conference.attr.name and
+	        a_conference.attr.autojoin == b_conference.attr.autojoin and
+	        a_nick == b_nick and
+	        a_password == b_password);
+end
+
+local function publish_to_pep(jid, bookmarks, synchronise)
+	local service = mod_pep.get_pep_service(jid_split(jid));
+
+	if #bookmarks.tags == 0 then
+		if synchronise then
+			-- If we set zero legacy bookmarks, purge the bookmarks 2 node.
+			module:log("debug", "No bookmark in the set, purging instead.");
+			return service:purge(namespace, jid, true);
+		else
+			return true;
+		end
+	end
+
+	-- Retrieve the current bookmarks2.
+	module:log("debug", "Retrieving the current bookmarks 2.");
+	local has_bookmarks2, ret = service:get_items(namespace, jid);
+	local bookmarks2;
+	if not has_bookmarks2 and ret == "item-not-found" then
+		module:log("debug", "Got item-not-found, assuming it was empty until now, creating.");
+		local ok, err = service:create(namespace, jid, default_options);
+		if not ok then
+			module:log("error", "Creating bookmarks 2 node failed: %s", err);
+			return ok, err;
+		end
+		bookmarks2 = {};
+	elseif not has_bookmarks2 then
+		module:log("debug", "Got %s error, aborting.", ret);
+		return false, ret;
+	else
+		module:log("debug", "Got existing bookmarks2.");
+		bookmarks2 = ret;
+	end
+
+	-- Get a list of all items we may want to remove.
+	local to_remove = {};
+	for i in ipairs(bookmarks2) do
+		to_remove[bookmarks2[i]] = true;
+	end
+
+	for bookmark in bookmarks:childtags("conference", namespace_legacy) do
+		-- Create the new conference element by copying everything from the legacy one.
+		local conference = st.stanza("conference", {
+			xmlns = namespace,
+			name = bookmark.attr.name,
+			autojoin = bookmark.attr.autojoin,
+		});
+		local nick = bookmark:get_child_text("nick");
+		if nick ~= nil then
+			conference:text_tag("nick", nick):up();
+		end
+		local password = bookmark:get_child_text("password");
+		if password ~= nil then
+			conference:text_tag("password", password):up();
+		end
+
+		-- Create its wrapper.
+		local item = st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = bookmark.attr.jid })
+			:add_child(conference);
+
+		-- Then publish it only if it’s a new one or updating a previous one.
+		if compare_bookmark2(item, bookmarks2[bookmark.attr.jid]) then
+			module:log("debug", "Item %s identical to the previous one, skipping.", item.attr.id);
+			to_remove[bookmark.attr.jid] = nil;
+		else
+			if bookmarks2[bookmark.attr.jid] == nil then
+				module:log("debug", "Item %s not existing previously, publishing.", item.attr.id);
+			else
+				module:log("debug", "Item %s different from the previous one, publishing.", item.attr.id);
+				to_remove[bookmark.attr.jid] = nil;
+			end
+			local ok, err = service:publish(namespace, jid, bookmark.attr.jid, item, default_options);
+			if not ok then
+				module:log("error", "Publishing item %s failed: %s", item.attr.id, err);
+				return ok, err;
+			end
+		end
+	end
+
+	-- Now handle retracting items that have been removed.
+	if synchronise then
+		for id in pairs(to_remove) do
+			module:log("debug", "Item %s removed from bookmarks.", id);
+			local ok, err = service:retract(namespace, jid, id, st.stanza("retract", { id = id }));
+			if not ok then
+				module:log("error", "Retracting item %s failed: %s", id, err);
+				return ok, err;
+			end
+		end
+	end
+	return true;
+end
+
+-- Synchronise legacy PEP to PEP.
+local function on_publish_legacy_pep(event)
+	local stanza, session = event.stanza, event.origin;
+	local pubsub = stanza:get_child("pubsub", "http://jabber.org/protocol/pubsub");
+	if pubsub == nil then
+		return;
+	end
+
+	local publish = pubsub:get_child("publish");
+	if publish == nil or publish.attr.node ~= namespace_legacy then
+		return;
+	end
+
+	local item = publish:get_child("item");
+	if item == nil then
+		return;
+	end
+
+	-- Here we ignore the item id, it’ll be generated as 'current' anyway.
+
+	local bookmarks = item:get_child("storage", namespace_legacy);
+	if bookmarks == nil then
+		return;
+	end
+
+	-- We also ignore the publish-options.
+
+	module:log("debug", "Legacy PEP bookmarks set by client, publishing to PEP.");
+
+	local ok, err = publish_to_pep(session.full_jid, bookmarks, true);
+	if not ok then
+		module:log("error", "Failed to publish to PEP bookmarks for %s@%s: %s", session.username, session.host, err);
+		session.send(st.error_reply(stanza, "cancel", "internal-server-error", "Failed to store bookmarks to PEP"));
+		return true;
+	end
+
+	session.send(st.reply(stanza));
+	return true;
+end
+
+-- Synchronise Private XML to PEP.
+local function on_publish_private_xml(event)
+	local stanza, session = event.stanza, event.origin;
+	local query = stanza:get_child("query", namespace_private);
+	if query == nil then
+		return;
+	end
+
+	local bookmarks = query:get_child("storage", namespace_legacy);
+	if bookmarks == nil then
+		return;
+	end
+
+	module:log("debug", "Private bookmarks set by client, publishing to PEP.");
+
+	local ok, err = publish_to_pep(session.full_jid, bookmarks, true);
+	if not ok then
+		module:log("error", "Failed to publish to PEP bookmarks for %s@%s: %s", session.username, session.host, err);
+		session.send(st.error_reply(stanza, "cancel", "internal-server-error", "Failed to store bookmarks to PEP"));
+		return true;
+	end
+
+	session.send(st.reply(stanza));
+	return true;
+end
+
+local function migrate_legacy_bookmarks(event)
+	local session = event.session;
+	local username = session.username;
+	local service = mod_pep.get_pep_service(username);
+	local jid = username.."@"..session.host;
+
+	local ok, ret = service:get_items(namespace_legacy, session.full_jid);
+	if ok then
+		module:log("debug", "Legacy PEP bookmarks found for %s, migrating.", jid);
+		local failed = false;
+		for _, item_id in ipairs(ret) do
+			local item = ret[item_id];
+			if item.attr.id ~= "current" then
+				module:log("warn", "Legacy PEP bookmarks for %s isn’t using 'current' as its id: %s", jid, item.attr.id);
+			end
+			local bookmarks = item:get_child("storage", namespace_legacy);
+			module:log("debug", "Got legacy PEP bookmarks of %s: %s", jid, bookmarks);
+
+			local ok, err = publish_to_pep(session.full_jid, bookmarks, false);
+			if not ok then
+				module:log("error", "Failed to store legacy PEP bookmarks to bookmarks 2 for %s, aborting migration: %s", jid, err);
+				failed = true;
+				break;
+			end
+		end
+		if not failed then
+			module:log("debug", "Successfully migrated legacy PEP bookmarks of %s to bookmarks 2, attempting deletion of the node.", jid);
+			local ok, err = service:delete(namespace_legacy, jid);
+			if not ok then
+				module:log("error", "Failed to delete legacy PEP bookmarks for %s: %s", jid, err);
+			end
+		end
+	end
+
+	local data, err = private_storage:get(username, "storage:storage:bookmarks");
+	if not data then
+		module:log("debug", "No existing legacy bookmarks for %s, migration already done: %s", jid, err);
+		local ok, ret2 = service:get_items(namespace, session.full_jid);
+		if not ok or not ret2 then
+			module:log("debug", "Additionally, no bookmarks 2 were existing for %s, assuming empty.", jid);
+			module:fire_event("bookmarks/empty", { session = session });
+		end
+		return;
+	end
+	local bookmarks = st.deserialize(data);
+	module:log("debug", "Got legacy bookmarks of %s: %s", jid, bookmarks);
+
+	module:log("debug", "Going to store legacy bookmarks to bookmarks 2 %s.", jid);
+	local ok, err = publish_to_pep(session.full_jid, bookmarks, false);
+	if not ok then
+		module:log("error", "Failed to store legacy bookmarks to bookmarks 2 for %s, aborting migration: %s", jid, err);
+		return;
+	end
+	module:log("debug", "Stored legacy bookmarks to bookmarks 2 for %s.", jid);
+
+	local ok, err = private_storage:set(username, "storage:storage:bookmarks", nil);
+	if not ok then
+		module:log("error", "Failed to remove legacy bookmarks of %s: %s", jid, err);
+		return;
+	end
+	module:log("debug", "Removed legacy bookmarks of %s, migration done!", jid);
+end
+
+local function on_node_created(event)
+	local service, node, actor = event.service, event.node, event.actor;
+	if node ~= namespace_legacy then
+		return;
+	end
+
+	module:log("debug", "Something tried to create legacy PEP bookmarks for %s.", actor);
+	local ok, err = service:delete(namespace_legacy, actor);
+	if not ok then
+		module:log("error", "Failed to delete legacy PEP bookmarks for %s: %s", actor, err);
+	end
+	module:log("debug", "Legacy PEP bookmarks node of %s deleted.", actor);
+end
+
+module:hook("iq/bare/jabber:iq:private:query", function (event)
+	if event.stanza.attr.type == "get" then
+		return on_retrieve_private_xml(event);
+	else
+		return on_publish_private_xml(event);
+	end
+end, 1);
+module:hook("iq/bare/http://jabber.org/protocol/pubsub:pubsub", function (event)
+	if event.stanza.attr.type == "get" then
+		return on_retrieve_legacy_pep(event);
+	else
+		return on_publish_legacy_pep(event);
+	end
+end, 1);
+module:hook("resource-bind", migrate_legacy_bookmarks);
+module:handle_items("pep-service", function (event)
+	local service = event.item.service;
+	module:hook_object_event(service.events, "node-created", on_node_created);
+end, function () end, true);