-- 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.

--

module:set_global();

module:depends("http_errors");

local moduleapi = require "core.moduleapi";

local url_parse = require "socket.url".parse;

local server = require "net.http.server";

server.set_default_host(module:get_option_string("http_default_host"));

local function normalize_path(path)

	if path:sub(-1,-1) == "/" then path = path:sub(1, -2); end

	if path:sub(1,1) ~= "/" then path = "/"..path; end

	return path;

end

local function get_http_event(host, app_path, key)

	local method, path = key:match("^(%S+)%s+(.+)$");

	if not method then -- No path specified, default to "" (base path)

		method, path = key, "";

	end

	if method:sub(1,1) == "/" then

		return nil;

	end

	return method:upper().." "..host..app_path..path;

end

local function get_base_path(host_module, app_name, default_app_path)

	return normalize_path(host_module:get_option("http_paths", {})[app_name] -- Host

		or module:get_option("http_paths", {})[app_name] -- Global

		or default_app_path); -- Default

end

-- Helper to deduce a module's external URL

function moduleapi.http_url(module, app_name, default_path)

	app_name = app_name or (module.name:gsub("^http_", ""));

	local ext = url_parse(module:get_option_string("http_external_url")) or {};

	local services = portmanager.get_active_services();

	local http_services = services:get("https") or services:get("http") or {};

	for interface, ports in pairs(http_services) do

		for port, services in pairs(ports) do

			local path = get_base_path(module, app_name, default_path or "/"..app_name);

			port = tonumber(ext.port) or port or 80;

			if port == 80 then port = ""; else port = ":"..port; end

			return (ext.scheme or services[1].service.name).."://"

				..(ext.host or module.host)..port

				..normalize_path(ext.path or "/")..(path:sub(2));

		end

	end

end

function module.add_host(module)

	local host = module.host;

	local apps = {};

	module.environment.apps = apps;

	local function http_app_added(event)

		local app_name = event.item.name;

		local default_app_path = event.item.default_path or "/"..app_name;

		local app_path = get_base_path(module, app_name, default_app_path);

		if not app_name then

			-- TODO: Link to docs

			module:log("error", "HTTP app has no 'name', add one or use module:provides('http', app)");

			return;

		end

		apps[app_name] = apps[app_name] or {};

		local app_handlers = apps[app_name];

		for key, handler in pairs(event.item.route or {}) do

			local event_name = get_http_event(host, app_path, key);

			if event_name then

				if type(handler) ~= "function" then

					local data = handler;

					handler = function () return data; end

				elseif event_name:sub(-2, -1) == "/*" then

					local base_path = event_name:match("/(.+)/*$");

					local _handler = handler;

					handler = function (event)

						local path = event.request.path:sub(#base_path+1);

						return _handler(event, path);

					end;

				end

				if not app_handlers[event_name] then

					app_handlers[event_name] = handler;

					module:hook_object_event(server, event_name, handler);

				else

					module:log("warn", "App %s added handler twice for '%s', ignoring", app_name, event_name);

				end

			else

				module:log("error", "Invalid route in %s, %q. See http://prosody.im/doc/developers/http#routes", app_name, key);

			end

		end

	end

	local function http_app_removed(event)

		local app_handlers = apps[event.item.name];

		apps[event.item.name] = nil;

		for event, handler in pairs(app_handlers) do

			module:unhook_object_event(server, event, handler);

		end

	end

	module:handle_items("http-provider", http_app_added, http_app_removed);

	server.add_host(host);

	function module.unload()

		server.remove_host(host);

	end

end

module:add_item("net-provider", {

	name = "http";

	listener = server.listener;

	default_port = 5280;

	multiplex = {

		pattern = "^[A-Z]";

	};

});

module:add_item("net-provider", {

	name = "https";

	listener = server.listener;

	default_port = 5281;

	encryption = "ssl";

	multiplex = {

		pattern = "^[A-Z]";

	};

});