1 files changed, 367 insertions, 0 deletions
diff --git a/core/moduleapi.lua b/core/moduleapi.lua
new file mode 100644
index 00000000..ed75669b
--- /dev/null
+++ b/core/moduleapi.lua
@@ -0,0 +1,367 @@
+-- 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 config = require "core.configmanager";
+local modulemanager = require "modulemanager"; -- This is necessary to avoid require loops
+local array = require "util.array";
+local set = require "util.set";
+local logger = require "util.logger";
+local pluginloader = require "util.pluginloader";
+local timer = require "util.timer";
+
+local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
+local error, setmetatable, type = error, setmetatable, type;
+local ipairs, pairs, select, unpack = ipairs, pairs, select, unpack;
+local tonumber, tostring = tonumber, tostring;
+
+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 hosts[self.host].type or nil;
+end
+
+function api:set_global()
+	self.host = "*";
+	-- Update the logger
+	local _log = logger.init("mod_"..self.name);
+	self.log = function (self, ...) return _log(...); end;
+	self._log = _log;
+	self.global = true;
+end
+
+function api:add_feature(xmlns)
+	self:add_item("feature", xmlns);
+end
+function api:add_identity(category, type, name)
+	self:add_item("identity", {category = category, type = type, name = name});
+end
+function api:add_extension(data)
+	self:add_item("extension", data);
+end
+function api:has_feature(xmlns)
+	for _, feature in ipairs(self:get_host_items("feature")) do
+		if feature == xmlns then return true; end
+	end
+	return false;
+end
+function api:has_identity(category, type, name)
+	for _, id in ipairs(self:get_host_items("identity")) do
+		if id.category == category and id.type == type and id.name == name then
+			return true; 
+		end
+	end
+	return false;
+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)
+	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_stanza()");
+		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:require(lib)
+	local f, n = pluginloader.load_code(self.name, lib..".lib.lua", self.environment);
+	if not f then
+		f, n = pluginloader.load_code(lib, lib..".lib.lua", self.environment);
+	end
+	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)
+	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;
+	return mod;
+end
+
+-- Returns one or more shared tables at the specified virtual paths
+-- Intentionally does not allow the table at a path to be _set_, it
+-- is auto-created if it does not exist.
+function api:shared(...)
+	if not self.shared_data then self.shared_data = {}; end
+	local paths = { n = select("#", ...), ... };
+	local data_array = {};
+	local default_path_components = { self.host, self.name };
+	for i = 1, paths.n do
+		local path = paths[i];
+		if path:sub(1,1) ~= "/" then -- Prepend default components
+			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 = shared_data[path];
+		if not shared then
+			shared = {};
+			if path:match("%-cache$") then
+				setmetatable(shared, { __mode = "kv" });
+			end
+			shared_data[path] = shared;
+		end
+		t_insert(data_array, shared);
+		self.shared_data[path] = shared;
+	end
+	return unpack(data_array);
+end
+
+function api:get_option(name, default_value)
+	local value = config.get(self.host, name);
+	if value == nil then
+		value = default_value;
+	end
+	return value;
+end
+
+function api:get_option_string(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
+	if value == nil then
+		return nil;
+	end
+	return tostring(value);
+end
+
+function api:get_option_number(name, ...)
+	local value = self:get_option(name, ...);
+	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
+	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(name, ...);
+	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
+	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:context(host)
+	return setmetatable({host=host or "*"}, {__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 result = modulemanager.get_items(key, self.host) or {};
+	return result;
+end
+
+function api:handle_items(type, added_cb, removed_cb, existing)
+	self:hook("item-added/"..type, added_cb);
+	self:hook("item-removed/"..type, removed_cb);
+	if existing ~= false then
+		for _, item in ipairs(self:get_host_items(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.."_", 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)
+	return core_post_stanza(hosts[self.host], stanza);
+end
+
+function api:add_timer(delay, callback)
+	return timer.add_task(delay, function (t)
+		if self.loaded == false then return; end
+		return callback(t);
+	end);
+end
+
+local path_sep = package.config:sub(1,1);
+function api:get_directory()
+	return self.path and (self.path:gsub("%"..path_sep.."[^"..path_sep.."]*$", "")) or nil;
+end
+
+function api:load_resource(path, mode)
+	path = config.resolve_relative_path(self:get_directory(), path);
+	return io.open(path, mode);
+end
+
+function api:open_store(name, type)
+	return storagemanager.open(self.host, name or self.name, type);
+end
+
+return api;