mirror of https://gitee.com/bigwinds/arangodb
131 lines
4.0 KiB
JavaScript
131 lines
4.0 KiB
JavaScript
'use strict';
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// //////////////////////////////////////////////////////////////////////////////
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// / DISCLAIMER
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// /
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// / Copyright 2015-2016 ArangoDB GmbH, Cologne, Germany
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// /
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// / Licensed under the Apache License, Version 2.0 (the "License")
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// / you may not use this file except in compliance with the License.
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// / You may obtain a copy of the License at
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// /
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// / http://www.apache.org/licenses/LICENSE-2.0
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// /
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// / Unless required by applicable law or agreed to in writing, software
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// / distributed under the License is distributed on an "AS IS" BASIS,
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// / WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// / See the License for the specific language governing permissions and
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// / limitations under the License.
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// /
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// / Copyright holder is ArangoDB GmbH, Cologne, Germany
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// /
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// / @author Alan Plum
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// //////////////////////////////////////////////////////////////////////////////
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const assert = require('assert');
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const il = require('@arangodb/util').inline;
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const cookieTransport = require('@arangodb/foxx/sessions/transports/cookie');
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const headerTransport = require('@arangodb/foxx/sessions/transports/header');
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const collectionStorage = require('@arangodb/foxx/sessions/storages/collection');
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module.exports = function sessionMiddleware (cfg) {
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if (!cfg) {
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cfg = {};
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}
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let storage = cfg.storage;
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if (cfg.storages) {
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console.warn(il`
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Found unexpected "storages" option in session middleware.
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Did you mean "storage"?
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`);
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}
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assert(storage, 'No session storage specified');
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if (typeof storage === 'string' || storage.isArangoCollection) {
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storage = collectionStorage(storage);
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} else if (typeof storage === 'function') {
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storage = storage();
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}
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if (storage.toClient) {
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console.warn(il`
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Found unexpected "toClient" method on session storage.
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Did you mean "forClient"?
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`);
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}
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assert(
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storage.forClient && storage.fromClient,
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'Session storage must have a forClient and fromClient method'
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);
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if (cfg.transports) {
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console.warn(il`
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Found unexpected "transports" option in session middleware.
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Did you mean "transport"?
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`);
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}
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let transports = cfg.transport || [];
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if (!Array.isArray(transports)) {
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transports = [transports];
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}
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transports = transports.map((transport) => {
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if (transport === 'cookie') {
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return cookieTransport();
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}
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if (transport === 'header') {
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return headerTransport();
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}
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if (typeof transport === 'function') {
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transport = transport();
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}
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assert(
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transport.get || transport.set,
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'Session transport must have a get and/or set method'
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);
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return transport;
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});
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assert(transports.length > 0, 'Must specify at least one session transport');
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const autoCreate = cfg.autoCreate !== false;
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return {
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storage,
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transport: transports,
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register() {
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return (req, res, next) => {
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let sid = null;
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for (const transport of transports) {
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if (typeof transport.get === 'function') {
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sid = transport.get(req) || null;
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}
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if (sid) {
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break;
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}
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}
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let payload = sid && storage.fromClient(sid);
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if (!payload) {
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if (!autoCreate) {
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payload = null;
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} else if (typeof storage.new === 'function') {
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payload = storage.new();
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} else {
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payload = {};
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}
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}
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req.sessionStorage = storage;
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req.session = payload;
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next();
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if (req.session) {
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sid = storage.forClient(req.session);
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for (const transport of transports.reverse()) {
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if (typeof transport.set === 'function') {
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transport.set(res, sid);
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}
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}
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} else if (payload) {
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for (const transport of transports.reverse()) {
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if (typeof transport.clear === 'function') {
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transport.clear(req);
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}
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}
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}
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};
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}
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};
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};
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