-- 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(); pcall(function () module:depends("http_errors"); end); local portmanager = require "core.portmanager"; local moduleapi = require "core.moduleapi"; local url_parse = require "socket.url".parse; local url_build = require "socket.url".build; local normalize_path = require "util.http".normalize_path; local set = require "util.set"; local server = require "net.http.server"; server.set_default_host(module:get_option_string("http_default_host")); server.set_option("body_size_limit", module:get_option_number("http_max_content_size")); server.set_option("buffer_size_limit", module:get_option_number("http_max_buffer_size")); -- CORS settigs local opt_methods = module:get_option_set("access_control_allow_methods", { "GET", "OPTIONS" }); local opt_headers = module:get_option_set("access_control_allow_headers", { "Content-Type" }); local opt_credentials = module:get_option_boolean("access_control_allow_credentials", false); local opt_max_age = module:get_option_number("access_control_max_age", 2 * 60 * 60); local function get_http_event(host, app_path, key) local method, path = key:match("^(%S+)%s+(.+)$"); if not method then -- No path specified, default to "" (base path) method, path = key, ""; end if method:sub(1,1) == "/" then return nil; end if app_path == "/" and path:sub(1,1) == "/" then app_path = ""; end if host == "*" then return method:upper().." "..app_path..path; else return method:upper().." "..host..app_path..path; end end local function get_base_path(host_module, app_name, default_app_path) return (normalize_path(host_module:get_option("http_paths", {})[app_name] -- Host or module:get_option("http_paths", {})[app_name] -- Global or default_app_path)) -- Default :gsub("%$(%w+)", { host = host_module.host }); end local function redir_handler(event) event.response.headers.location = event.request.path.."/"; if event.request.url.query then event.response.headers.location = event.response.headers.location .. "?" .. event.request.url.query end return 301; end local ports_by_scheme = { http = 80, https = 443, }; -- 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 external_url = url_parse(module:get_option_string("http_external_url")) or {}; if external_url.scheme and external_url.port == nil then external_url.port = ports_by_scheme[external_url.scheme]; end 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 -- luacheck: ignore 213/interface for port, service in pairs(ports) do -- luacheck: ignore 512 local url = { scheme = (external_url.scheme or service[1].service.name); host = (external_url.host or module:get_option_string("http_host", module.host)); port = tonumber(external_url.port) or port or 80; path = normalize_path(external_url.path or "/", true).. (get_base_path(module, app_name, default_path or "/"..app_name):sub(2)); } if ports_by_scheme[url.scheme] == url.port then url.port = nil end return url_build(url); end end module:log("warn", "No http ports enabled, can't generate an external URL"); return "http://disabled.invalid/"; end local function apply_cors_headers(response, methods, headers, max_age, allow_credentials, origin) response.headers.access_control_allow_methods = tostring(methods); response.headers.access_control_allow_headers = tostring(headers); response.headers.access_control_max_age = tostring(max_age) response.headers.access_control_allow_origin = origin or "*"; if allow_credentials then response.headers.access_control_allow_credentials = "true"; end end function module.add_host(module) local host = module.host; if host ~= "*" then host = module:get_option_string("http_host", host); end 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]; local app_methods = opt_methods; local function cors_handler(event_data) local request, response = event_data.request, event_data.response; apply_cors_headers(response, app_methods, opt_headers, opt_max_age, opt_credentials, request.headers.origin); end local function options_handler(event_data) cors_handler(event_data); return ""; end for key, handler in pairs(event.item.route or {}) do local event_name = get_http_event(host, app_path, key); if event_name then local method = event_name:match("^%S+"); if not app_methods:contains(method) then app_methods = app_methods + set.new{ method }; end local options_event_name = event_name:gsub("^%S+", "OPTIONS"); if type(handler) ~= "function" then local data = handler; handler = function () return data; end elseif event_name:sub(-2, -1) == "/*" then local base_path_len = #event_name:match("/.+$"); local _handler = handler; handler = function (_event) local path = _event.request.path:sub(base_path_len); return _handler(_event, path); end; module:hook_object_event(server, event_name:sub(1, -3), redir_handler, -1); elseif event_name:sub(-1, -1) == "/" then module:hook_object_event(server, event_name:sub(1, -2), redir_handler, -1); end if not app_handlers[event_name] then app_handlers[event_name] = { main = handler; cors = cors_handler; options = options_handler; }; module:hook_object_event(server, event_name, handler); module:hook_object_event(server, event_name, cors_handler, 1); module:hook_object_event(server, options_event_name, options_handler, -1); 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 https://prosody.im/doc/developers/http#routes", app_name, key); end end local services = portmanager.get_active_services(); if services:get("https") or services:get("http") then module:log("info", "Serving '%s' at %s", app_name, module:http_url(app_name, app_path)); else module:log("warn", "Not listening on any ports, '%s' will be unreachable", app_name); end end local function http_app_removed(event) local app_handlers = apps[event.item.name]; apps[event.item.name] = nil; for event_name, handlers in pairs(app_handlers) do module:unhook_object_event(server, event_name, handlers.main); module:unhook_object_event(server, event_name, handlers.cors); local options_event_name = event_name:gsub("^%S+", "OPTIONS"); module:unhook_object_event(server, options_event_name, handlers.options); end end module:handle_items("http-provider", http_app_added, http_app_removed); if host ~= "*" then server.add_host(host); function module.unload() server.remove_host(host); end end end module.add_host(module); -- set up handling on global context too local trusted_proxies = module:get_option_set("trusted_proxies", { "127.0.0.1", "::1" })._items; local function get_ip_from_request(request) local ip = request.conn:ip(); local forwarded_for = request.headers.x_forwarded_for; if forwarded_for then -- luacheck: ignore 631 -- This logic looks weird at first, but it makes sense. -- The for loop will take the last non-trusted-proxy IP from `forwarded_for`. -- We append the original request IP to the header. Then, since the last IP wins, there are two cases: -- Case a) The original request IP is *not* in trusted proxies, in which case the X-Forwarded-For header will, effectively, be ineffective; the original request IP will win because it overrides any other IP in the header. -- Case b) The original request IP is in trusted proxies. In that case, the if branch in the for loop will skip the last IP, causing it to be ignored. The second-to-last IP will be taken instead. -- Case c) If the second-to-last IP is also a trusted proxy, it will also be ignored, iteratively, up to the last IP which isn’t in trusted proxies. -- Case d) If all IPs are in trusted proxies, something went obviously wrong and the logic never overwrites `ip`, leaving it at the original request IP. forwarded_for = forwarded_for..", "..ip; for forwarded_ip in forwarded_for:gmatch("[^%s,]+") do if not trusted_proxies[forwarded_ip] then ip = forwarded_ip; end end end return ip; end module:wrap_object_event(server._events, false, function (handlers, event_name, event_data) local request = event_data.request; if request then -- Not included in eg http-error events request.ip = get_ip_from_request(request); end return handlers(event_name, event_data); end); module:provides("net", { name = "http"; listener = server.listener; default_port = 5280; multiplex = { pattern = "^[A-Z]"; }; }); module:provides("net", { name = "https"; listener = server.listener; default_port = 5281; encryption = "ssl"; multiplex = { protocol = "http/1.1"; pattern = "^[A-Z]"; }; });