File

core/moduleapi.lua @ 13130:0b650a54ff9a

doc/hgrc-email: Example config for using 'hg email' to contribute The initial setup can be tricky if you don't know what and were settings should be added. This should maybe also go into site/doc/contributing
author Kim Alvefur <zash@zash.se>
date Wed, 07 Jun 2023 16:56:53 +0200
parent 13016:8aec903ea888
child 13201:65fb0d7a2312
line wrap: on
line source

-- Prosody IM
-- Copyright (C) 2008-2012 Matthew Wild
-- Copyright (C) 2008-2012 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

local array = require "prosody.util.array";
local set = require "prosody.util.set";
local it = require "prosody.util.iterators";
local logger = require "prosody.util.logger";
local timer = require "prosody.util.timer";
local resolve_relative_path = require"prosody.util.paths".resolve_relative_path;
local st = require "prosody.util.stanza";
local cache = require "prosody.util.cache";
local errors = require "prosody.util.error";
local promise = require "prosody.util.promise";
local time_now = require "prosody.util.time".now;
local format = require "prosody.util.format".format;
local jid_node = require "prosody.util.jid".node;
local jid_split = require "prosody.util.jid".split;
local jid_resource = require "prosody.util.jid".resource;

local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
local error, setmetatable, type = error, setmetatable, type;
local ipairs, pairs, select = ipairs, pairs, select;
local tonumber, tostring = tonumber, tostring;
local require = require;
local pack = table.pack;
local unpack = table.unpack;

local prosody = prosody;
local hosts = prosody.hosts;

-- FIXME: This assert() is to try and catch an obscure bug (2013-04-05)
local core_post_stanza = assert(prosody.core_post_stanza,
	"prosody.core_post_stanza is nil, please report this as a bug");

-- Registry of shared module data
local shared_data = setmetatable({}, { __mode = "v" });

local NULL = {};

local api = {};

-- Returns the name of the current module
function api:get_name()
	return self.name;
end

-- Returns the host that the current module is serving
function api:get_host()
	return self.host;
end

function api:get_host_type()
	return (self.host == "*" and "global") or hosts[self.host].type or "local";
end

function api:set_global()
	self.host = "*";
	-- Update the logger
	local _log = logger.init("mod_"..self.name);
	self.log = function (self, ...) return _log(...); end; --luacheck: ignore self
	self._log = _log;
	self.global = true;
end

function api:add_feature(xmlns)
	self:add_item("feature", xmlns);
end
function api:add_identity(category, identity_type, name)
	self:add_item("identity", {category = category, type = identity_type, name = name});
end
function api:add_extension(data)
	self:add_item("extension", data);
end

function api:fire_event(...)
	return (hosts[self.host] or prosody).events.fire_event(...);
end

function api:hook_object_event(object, event, handler, priority)
	self.event_handlers:set(object, event, handler, true);
	return object.add_handler(event, handler, priority);
end

function api:unhook_object_event(object, event, handler)
	self.event_handlers:set(object, event, handler, nil);
	return object.remove_handler(event, handler);
end

function api:hook(event, handler, priority)
	return self:hook_object_event((hosts[self.host] or prosody).events, event, handler, priority);
end

function api:hook_global(event, handler, priority)
	return self:hook_object_event(prosody.events, event, handler, priority);
end

function api:hook_tag(xmlns, name, handler, priority)
	if not handler and type(name) == "function" then
		-- If only 2 options then they specified no xmlns
		xmlns, name, handler, priority = nil, xmlns, name, handler;
	elseif not (handler and name) then
		self:log("warn", "Error: Insufficient parameters to module:hook_tag()");
		return;
	end
	return self:hook("stanza/"..(xmlns and (xmlns..":") or "")..name,
		function (data) return handler(data.origin, data.stanza, data); end, priority);
end
api.hook_stanza = api.hook_tag; -- COMPAT w/pre-0.9

function api:unhook(event, handler)
	return self:unhook_object_event((hosts[self.host] or prosody).events, event, handler);
end

function api:wrap_object_event(events_object, event, handler)
	return self:hook_object_event(assert(events_object.wrappers, "no wrappers"), event, handler);
end

function api:wrap_event(event, handler)
	return self:wrap_object_event((hosts[self.host] or prosody).events, event, handler);
end

function api:wrap_global(event, handler)
	return self:hook_object_event(prosody.events, event, handler);
end

function api:require(lib)
	local modulemanager = require"prosody.core.modulemanager";
	local f, n = modulemanager.loader:load_code_ext(self.name, lib, "lib.lua", self.environment);
	if not f then error("Failed to load plugin library '"..lib.."', error: "..n); end -- FIXME better error message
	return f();
end

function api:depends(name)
	local modulemanager = require"prosody.core.modulemanager";
	if self:get_option_inherited_set("modules_disabled", {}):contains(name) then
		error("Dependency on disabled module mod_"..name);
	end
	if not self.dependencies then
		self.dependencies = {};
		self:hook("module-reloaded", function (event)
			if self.dependencies[event.module] and not self.reloading then
				self:log("info", "Auto-reloading due to reload of %s:%s", event.host, event.module);
				modulemanager.reload(self.host, self.name);
				return;
			end
		end);
		self:hook("module-unloaded", function (event)
			if self.dependencies[event.module] then
				self:log("info", "Auto-unloading due to unload of %s:%s", event.host, event.module);
				modulemanager.unload(self.host, self.name);
			end
		end);
	end
	local mod = modulemanager.get_module(self.host, name) or modulemanager.get_module("*", name);
	if mod and mod.module.host == "*" and self.host ~= "*"
	and modulemanager.module_has_method(mod, "add_host") then
		mod = nil; -- Target is a shared module, so we still want to load it on our host
	end
	if not mod then
		local err;
		mod, err = modulemanager.load(self.host, name);
		if not mod then
			return error(("Unable to load required module, mod_%s: %s"):format(name, ((err or "unknown error"):gsub("%-", " ")) ));
		end
	end
	self.dependencies[name] = true;
	if not mod.module.reverse_dependencies then
		mod.module.reverse_dependencies = {};
	end
	mod.module.reverse_dependencies[self.name] = true;
	return mod;
end

local function get_shared_table_from_path(module, tables, path)
	if path:sub(1,1) ~= "/" then -- Prepend default components
		local default_path_components = { module.host, module.name };
		local n_components = select(2, path:gsub("/", "%1"));
		path = (n_components<#default_path_components and "/" or "")
			..t_concat(default_path_components, "/", 1, #default_path_components-n_components).."/"..path;
	end
	local shared = tables[path];
	if not shared then
		shared = {};
		if path:match("%-cache$") then
			setmetatable(shared, { __mode = "kv" });
		end
		tables[path] = shared;
	end
	return shared;
end

-- Returns a shared table at the specified virtual path
-- Intentionally does not allow the table to be _set_, it
-- is auto-created if it does not exist.
function api:shared(path)
	if not self.shared_data then self.shared_data = {}; end
	local shared = get_shared_table_from_path(self, shared_data, path);
	self.shared_data[path] = shared;
	return shared;
end

function api:get_option(name, default_value)
	local config = require "prosody.core.configmanager";
	local value = config.get(self.host, name);
	if value == nil then
		value = default_value;
	end
	return value;
end

function api:get_option_scalar(name, default_value)
	local value = self:get_option(name, default_value);
	if type(value) == "table" then
		if #value > 1 then
			self:log("error", "Config option '%s' does not take a list, using just the first item", name);
		end
		value = value[1];
	end
	return value;
end

function api:get_option_string(name, default_value)
	local value = self:get_option_scalar(name, default_value);
	if value == nil then
		return nil;
	end
	return tostring(value);
end

function api:get_option_number(name, ...)
	local value = self:get_option_scalar(name, ...);
	local ret = tonumber(value);
	if value ~= nil and ret == nil then
		self:log("error", "Config option '%s' not understood, expecting a number", name);
	end
	return ret;
end

function api:get_option_boolean(name, ...)
	local value = self:get_option_scalar(name, ...);
	if value == nil then
		return nil;
	end
	local ret = value == true or value == "true" or value == 1 or nil;
	if ret == nil then
		ret = (value == false or value == "false" or value == 0);
		if ret then
			ret = false;
		else
			ret = nil;
		end
	end
	if ret == nil then
		self:log("error", "Config option '%s' not understood, expecting true/false", name);
	end
	return ret;
end

function api:get_option_array(name, ...)
	local value = self:get_option(name, ...);

	if value == nil then
		return nil;
	end

	if type(value) ~= "table" then
		return array{ value }; -- Assume any non-list is a single-item list
	end

	return array():append(value); -- Clone
end

function api:get_option_set(name, ...)
	local value = self:get_option_array(name, ...);

	if value == nil then
		return nil;
	end

	return set.new(value);
end

function api:get_option_inherited_set(name, ...)
	local value = self:get_option_set(name, ...);
	local global_value = self:context("*"):get_option_set(name, ...);
	if not value then
		return global_value;
	elseif not global_value then
		return value;
	end
	value:include(global_value);
	return value;
end

function api:get_option_path(name, default, parent)
	if parent == nil then
		parent = self:get_directory();
	elseif prosody.paths[parent] then
		parent = prosody.paths[parent];
	end
	local value = self:get_option_string(name, default);
	if value == nil then
		return nil;
	end
	return resolve_relative_path(parent, value);
end


function api:context(host)
	return setmetatable({ host = host or "*", global = "*" == host }, { __index = self, __newindex = self });
end

function api:add_item(key, value)
	self.items = self.items or {};
	self.items[key] = self.items[key] or {};
	t_insert(self.items[key], value);
	self:fire_event("item-added/"..key, {source = self, item = value});
end
function api:remove_item(key, value)
	local t = self.items and self.items[key] or NULL;
	for i = #t,1,-1 do
		if t[i] == value then
			t_remove(self.items[key], i);
			self:fire_event("item-removed/"..key, {source = self, item = value});
			return value;
		end
	end
end

function api:get_host_items(key)
	local modulemanager = require"prosody.core.modulemanager";
	local result = modulemanager.get_items(key, self.host) or {};
	return result;
end

function api:handle_items(item_type, added_cb, removed_cb, existing)
	self:hook("item-added/"..item_type, added_cb);
	self:hook("item-removed/"..item_type, removed_cb);
	if existing ~= false then
		for _, item in ipairs(self:get_host_items(item_type)) do
			added_cb({ item = item });
		end
	end
end

function api:provides(name, item)
	-- if not item then item = setmetatable({}, { __index = function(t,k) return rawget(self.environment, k); end }); end
	if not item then
		item = {}
		for k,v in pairs(self.environment) do
			if k ~= "module" then item[k] = v; end
		end
	end
	if not item.name then
		local item_name = self.name;
		-- Strip a provider prefix to find the item name
		-- (e.g. "auth_foo" -> "foo" for an auth provider)
		if item_name:find((name:gsub("%-", "_")).."_", 1, true) == 1 then
			item_name = item_name:sub(#name+2);
		end
		item.name = item_name;
	end
	item._provided_by = self.name;
	self:add_item(name.."-provider", item);
end

function api:send(stanza, origin)
	return core_post_stanza(origin or hosts[self.host], stanza);
end

function api:send_iq(stanza, origin, timeout)
	local iq_cache = self._iq_cache;
	if not iq_cache then
		iq_cache = cache.new(256, function (_, iq)
			iq.reject(errors.new({
				type = "wait", condition = "resource-constraint",
				text = "evicted from iq tracking cache"
			}));
		end);
		self._iq_cache = iq_cache;
	end

	local event_type;
	if not jid_node(stanza.attr.from) then
		event_type = "host";
	elseif jid_resource(stanza.attr.from) then
		event_type = "full";
	else -- assume bare since we can't hook full jids
		event_type = "bare";
	end
	local result_event = "iq-result/"..event_type.."/"..stanza.attr.id;
	local error_event = "iq-error/"..event_type.."/"..stanza.attr.id;
	local cache_key = event_type.."/"..stanza.attr.id;
	if event_type == "full" then
		result_event = "iq/" .. event_type;
		error_event = "iq/" .. event_type;
	end

	local p = promise.new(function (resolve, reject)
		local function result_handler(event)
			local response = event.stanza;
			if response.attr.type == "result" and response.attr.from == stanza.attr.to and response.attr.id == stanza.attr.id then
				resolve(event);
				return true;
			end
		end

		local function error_handler(event)
			local response = event.stanza;
			if response.attr.type == "error" and response.attr.from == stanza.attr.to and response.attr.id == stanza.attr.id then
				reject(errors.from_stanza(event.stanza, event));
				return true;
			end
		end

		if iq_cache:get(cache_key) then
			reject(errors.new({
				type = "modify", condition = "conflict",
				text = "IQ stanza id attribute already used",
			}));
			return;
		end

		self:hook(result_event, result_handler, 1);
		self:hook(error_event, error_handler, 1);

		local timeout_handle = self:add_timer(timeout or 120, function ()
			reject(errors.new({
				type = "wait", condition = "remote-server-timeout",
				text = "IQ stanza timed out",
			}));
		end);

		local ok = iq_cache:set(cache_key, {
			reject = reject, resolve = resolve,
			timeout_handle = timeout_handle,
			result_handler = result_handler, error_handler = error_handler;
		});

		if not ok then
			reject(errors.new({
				type = "wait", condition = "internal-server-error",
				text = "Could not store IQ tracking data"
			}));
			return;
		end

		local wrapped_origin = setmetatable({
				-- XXX Needed in some cases for replies to work correctly when sending queries internally.
				send = function (reply)
					if reply.name == stanza.name and reply.attr.id == stanza.attr.id then
						resolve({ stanza = reply });
					end
					return (origin or hosts[self.host]).send(reply)
				end;
			}, {
				__index = origin or hosts[self.host];
			});

		self:send(stanza, wrapped_origin);
	end);

	p:finally(function ()
		local iq = iq_cache:get(cache_key);
		if iq then
			self:unhook(result_event, iq.result_handler);
			self:unhook(error_event, iq.error_handler);
			iq.timeout_handle:stop();
			iq_cache:set(cache_key, nil);
		end
	end);

	return p;
end

function api:broadcast(jids, stanza, iter)
	for jid in (iter or it.values)(jids) do
		local new_stanza = st.clone(stanza);
		new_stanza.attr.to = jid;
		self:send(new_stanza);
	end
end

local timer_methods = { }
local timer_mt = {
	__index = timer_methods;
}
function timer_methods:stop( )
	timer.stop(self.id);
end
timer_methods.disarm = timer_methods.stop
function timer_methods:reschedule(delay)
	timer.reschedule(self.id, delay)
end

local function timer_callback(now, id, t) --luacheck: ignore 212/id
	if t.module_env.loaded == false then return; end
	return t.callback(now, unpack(t, 1, t.n));
end

function api:add_timer(delay, callback, ...)
	local t = pack(...)
	t.module_env = self;
	t.callback = callback;
	t.id = timer.add_task(delay, timer_callback, t);
	return setmetatable(t, timer_mt);
end

function api:cron(task_spec)
	self:depends("cron");
	self:add_item("task", task_spec);
end

function api:hourly(name, fun)
	if type(name) == "function" then fun, name = name, nil; end
	self:cron({ name = name; when = "hourly"; run = fun });
end

function api:daily(name, fun)
	if type(name) == "function" then fun, name = name, nil; end
	self:cron({ name = name; when = "daily"; run = fun });
end

function api:weekly(name, fun)
	if type(name) == "function" then fun, name = name, nil; end
	self:cron({ name = name; when = "weekly"; run = fun });
end

local path_sep = package.config:sub(1,1);
function api:get_directory()
	return self.resource_path or self.path and (self.path:gsub("%"..path_sep.."[^"..path_sep.."]*$", "")) or nil;
end

function api:load_resource(path, mode)
	path = resolve_relative_path(self:get_directory(), path);
	return io.open(path, mode);
end

function api:open_store(name, store_type)
	if self.host == "*" then return nil, "global-storage-not-supported"; end
	return require"prosody.core.storagemanager".open(self.host, name or self.name, store_type);
end

function api:measure(name, stat_type, conf)
	local measure = require "prosody.core.statsmanager".measure;
	local fixed_label_key, fixed_label_value
	if self.host ~= "*" then
		fixed_label_key = "host"
		fixed_label_value = self.host
	end
	-- new_legacy_metric takes care of scoping for us, as it does not accept
	-- an array of labels
	-- the prosody_ prefix is automatically added by statsmanager for legacy
	-- metrics.
	self:add_item("measure", { name = name, type = stat_type, conf = conf });
	return measure(stat_type, "mod_"..self.name.."/"..name, conf, fixed_label_key, fixed_label_value)
end

function api:metric(type_, name, unit, description, label_keys, conf)
	local metric = require "prosody.core.statsmanager".metric;
	local is_scoped = self.host ~= "*"
	if is_scoped then
		-- prepend `host` label to label keys if this is not a global module
		local orig_labels = label_keys
		label_keys = array { "host" }
		label_keys:append(orig_labels)
	end
	local mf = metric(type_, "prosody_mod_"..self.name.."/"..name, unit, description, label_keys, conf)
	self:add_item("metric", { name = name, mf = mf });
	if is_scoped then
		-- make sure to scope the returned metric family to the current host
		return mf:with_partial_label(self.host)
	end
	return mf
end

local status_priorities = { error = 3, warn = 2, info = 1, core = 0 };

function api:set_status(status_type, status_message, override)
	local priority = status_priorities[status_type];
	if not priority then
		self:log("error", "set_status: Invalid status type '%s', assuming 'info'", status_type);
		status_type, priority = "info", status_priorities.info;
	end
	local current_priority = status_priorities[self.status_type] or 0;
	-- By default an 'error' status can only be overwritten by another 'error' status
	if (current_priority >= status_priorities.error and priority < current_priority and override ~= true)
	or (override == false and current_priority > priority) then
		self:log("debug", "moduleapi: ignoring status [prio %d override %s]: %s", priority, override, status_message);
		return;
	end
	self.status_type, self.status_message, self.status_time = status_type, status_message, time_now();
	self:fire_event("module-status/updated", { name = self.name });
end

function api:log_status(level, msg, ...)
	self:set_status(level, format(msg, ...));
	return self:log(level, msg, ...);
end

function api:get_status()
	return self.status_type, self.status_message, self.status_time;
end

function api:default_permission(role_name, permission)
	permission = permission:gsub("^:", self.name..":");
	if self.host == "*" then
		for _, host in pairs(hosts) do
			if host.authz then
				host.authz.add_default_permission(role_name, permission);
			end
		end
		return
	end
	hosts[self.host].authz.add_default_permission(role_name, permission);
end

function api:default_permissions(role_name, permissions)
	for _, permission in ipairs(permissions) do
		self:default_permission(role_name, permission);
	end
end

function api:could(action, context)
	return self:may(action, context, true);
end

function api:may(action, context, peek)
	if action:byte(1) == 58 then -- action begins with ':'
		action = self.name..action; -- prepend module name
	end
	if type(context) == "string" then -- check JID permissions
		local role;
		local node, host = jid_split(context);
		if host == self.host then
			role = hosts[host].authz.get_user_role(node);
		else
			role = hosts[self.host].authz.get_jid_role(context);
		end
		if not role then
			if not peek then
				self:log("debug", "Access denied: JID <%s> may not %s (no role found)", context, action);
			end
			return false;
		end
		local permit = role:may(action);
		if not permit then
			if not peek then
				self:log("debug", "Access denied: JID <%s> may not %s (not permitted by role %s)", context, action, role.name);
			end
		end
		return permit;
	end

	local session = context.origin or context.session;
	if type(session) ~= "table" then
		error("Unable to identify actor session from context");
	end
	if session.type == "c2s" and session.host == self.host then
		local role = session.role;
		if not role then
			if not peek then
				self:log("warn", "Access denied: session %s has no role assigned");
			end
			return false;
		end
		local permit = role:may(action, context);
		if not permit and not peek then
			self:log("debug", "Access denied: session %s (%s) may not %s (not permitted by role %s)",
				session.id, session.full_jid, action, role.name
			);
		end
		return permit;
	else
		local actor_jid = context.stanza.attr.from;
		local role = hosts[self.host].authz.get_jid_role(actor_jid);
		if not role then
			if not peek then
				self:log("debug", "Access denied: JID <%s> may not %s (no role found)", actor_jid, action);
			end
			return false;
		end
		local permit = role:may(action, context);
		if not permit and not peek then
			self:log("debug", "Access denied: JID <%s> may not %s (not permitted by role %s)", actor_jid, action, role.name);
		end
		return permit;
	end
end

-- Execute a function, once, but only after startup is complete
function api:once(f) --luacheck: ignore 212/self
	return prosody.started:next(f);
end

return api;