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middleware.js
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middleware.js
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var express = require('express');
var secrets = require('./lib/secrets');
var configuration = require('./lib/configuration');
var logger = require('./lib/logger');
var util = require('util');
var crypto = require('crypto');
var User = require('./models/user');
var path = require('path');
var lessMiddleware = require('less-middleware');
var _ = require('underscore');
var statsd = require('./lib/statsd');
var cookieSession = require('cookie-session');
// `COOKIE_SECRET` is randomly generated on the first run of the server,
// then stored to a file and looked up on restart to maintain state.
// See the `secrets.js` for more information.
var COOKIE_SECRET = secrets.hydrateSecret('openbadges_cookie', configuration.get('var_path'));
var COOKIE_KEY = 'openbadges_state';
// Store sessions in cookies. The session structure is base64 encoded, a
// salty hash is created with `COOKIE_SECRET` to prevent clientside tampering.
exports.cookieSessions = function cookieSessions() {
return cookieSession({
secret: COOKIE_SECRET,
key: COOKIE_KEY,
cookie: {
httpOnly: true,
maxAge: (7 * 24 * 60 * 60 * 1000), //one week
secure: false
}
});
};
const requestLogger = logger.middleware();
const imgPrefix = '/images/badge/';
exports.logRequests = function logRequests() {
return function (req, res, next) {
var ua = req.headers['user-agent'] || '';
var heartbeat = (ua.indexOf('HTTP-Monitor') === 0);
if (heartbeat || req.url.indexOf(imgPrefix) === 0)
return next();
requestLogger(req, res, next);
};
};
exports.statsdRequests = function statsdRequests () {
return function (req, res, next) {
var bucket = util.format('paths%s.%s', req.path.replace(/\//g, '.'), req.method.toLowerCase());
statsd.increment(bucket);
return next();
};
};
exports.findPassportUser = function() {
return function (req, res, next) {
if (!req.session) {
logger.debug('could not find session');
return next();
}
if (!req.session.passport) {
return next();
}
User.findById(req.session.passport.user, function(err, user) {
if (err) {
logger.error(err, "Problem finding/creating user");
return next(err);
}
req.user = res.locals.user = user;
return next();
});
};
}
// exports.userFromSession = function userFromSession() {
// return function (req, res, next) {
// var email = '';
// var emailRe = /^.+?\@.+?\.*$/;
// if (!req.session) {
// logger.debug('could not find session');
// return next();
// }
// if (!req.session.emails) {
// return next();
// }
// console.log("session", req.session)
// email = req.session.emails[0];
// if (!emailRe.test(email)) {
// logger.warn('req.session.emails does not contain valid user: ' + email);
// req.session = {};
// return req.next();
// }
// User.findOrCreate(email, function (err, user) {
// if (err) {
// logger.error(err, "Problem finding/creating user");
// return next(err);
// }
// req.user = res.locals.user = user;
// return next();
// });
// };
// };
function whitelisted(list, input) {
var pattern;
for (var i = list.length; i--;) {
pattern = list[i];
if (RegExp('^' + list[i] + '$').test(input)) return true;
}
return false;
}
exports.noFrame = function noFrame(opts) {
var list = opts.whitelist;
return function (req, res, next) {
if (!whitelisted(list, req.url)) res.setHeader('x-frame-options', 'DENY');
return next();
};
};
exports.cors = function cors(options) {
options = options || {};
var list = options.whitelist || [];
if (typeof list === 'string') list = [list];
return function (req, res, next) {
if (!whitelisted(list, req.url)) return next();
res.header("Access-Control-Allow-Origin", "*");
return next();
};
};
// #FIXME: This was pulled from connect/lib/middleware/csrf.js
// The current version of the csrf middleware checks the token on
// HEAD requests and it shouldn't. Until issue #409 is resolved,
// we'll have to use this version.
// exports.csrf = function (options) {
// options = options || {};
// var value = options.value || defaultValue;
// var list = options.whitelist;
// return function (req, res, next) {
// var token = req.session._csrf || (req.session._csrf = utils.uid(24));
// if ('GET' == req.method || 'HEAD' == req.method || whitelisted(list, req.url)) return next();
// var val = value(req);
// if (val != token) {
// logger.debug("CSRF token failure");
// return utils.forbidden(res);
// }
// next();
// };
// };
exports.notFound = function notFound() {
return function (req, res, next) {
res.statusCode = 404;
if (req.accepts('html')) {
res.render('errors/404.html', {url: req.url});
} else if (req.accepts('json')) {
res.send({error: 'Not found'});
} else {
res.type('txt').send('Not found');
}
}
};
exports.less = function less() {
var src = path.join(__dirname, 'static/less');
var config = {
render: {
compress: "auto",
paths: [path.join(__dirname, "static/vendor/bootstrap/less")],
},
dest: path.join(__dirname, "static"),
debug: true,
force: true,
preprocess: {
path: function(pathname, req) {
return pathname.replace(path.sep + 'css' + path.sep, path.sep);
}
}
};
return lessMiddleware(src, config);
};
exports.staticTemplateViews = function staticTemplateViews(env, viewPrefix) {
viewPrefix = viewPrefix || '';
function hasView(env, view) {
try {
env.getTemplate(view);
return true;
}
catch (e) {
if (e.message && e.message.match(/template not found/))
return false;
throw e;
}
}
return function (req, res, next) {
var match;
if(match = /^\/([a-zA-Z0-9\/]+\.html)$/.exec(req.path)) {
var view = viewPrefix + match[1];
if (hasView(env, view)) {
return res.render(view, function(err, html) {
if (err) return next(err);
else return res.send(html);
});
}
}
next();
};
};
var utils = exports.utils = {};
var pseudoRandomBytes = function(num) {
var a = [];
for (var i = 0; i < num; i++)
a.push(getRandomInt(0, 255));
return new Buffer(a);
};
utils.forbidden = function (res) {
var body = 'Forbidden';
res.setHeader('Content-Type', 'text/plain');
res.setHeader('Content-Length', body.length);
res.statusCode = 403;
res.end(body);
};
// given that we've migrated to a newer express that handles csrf tokens slightly differently,
// we need to ditch this and fix up the areas/tests that rely upon it
/* @deprecated */
utils.createSecureToken = function(numBaseBytes) {
var randomBytes;
try {
randomBytes = crypto.randomBytes(numBaseBytes);
} catch (e) {
logger.warn('crypto.randomBytes() failed with ' + e);
logger.warn('falling back to pseudo-random bytes.');
randomBytes = pseudoRandomBytes(numBaseBytes);
}
return randomBytes.toString('base64') + '_' + Date.now().toString(32);
};
utils.uid = function (len) {
var buf = [];
var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
var charlen = chars.length;
for (var i = 0; i < len; ++i) {
buf.push(chars[getRandomInt(0, charlen - 1)]);
}
return buf.join('');
};
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
/**
* Default value function, checking the `req.body`
* and `req.query` for the CSRF token.
*
* @param {IncomingMessage} req
* @return {String}
* @api private
* @deprecated
*/
function defaultValue(req) {
return (req.body && req.body._csrf)
|| (req.query && req.query._csrf)
|| (req.headers['x-csrf-token']);
}