server/web/middlewares/configure-csrf.js

   1 'use strict';
   2
   3 var env = require('gitter-web-env');
   4 var stats = env.stats;
   5 var debug = require('debug')('gitter:infra:configure-csrf');
   6 var oauthService = require('gitter-web-oauth');
   7 var validateUserAgentFromReq = require('../validate-user-agent-from-req');
   8
   9 function setAccessToken(req, userId, accessToken) {
  10   if (req.session) {
  11     req.session['accessToken_' + (userId ? userId : '')] = accessToken;
  12   }
  13
  14   req.accessToken = accessToken;
  15 }
  16
  17 function getSessionAccessToken(req, userId) {
  18   if (req.session) {
  19     return req.session['accessToken_' + (userId ? userId : '')];
  20   }
  21 }
  22
  23 module.exports = function(req, res, next) {
  24   var userId = req.user && req.user.id;
  25
  26   function generateAccessToken() {
  27     if (req.user) {
  28       debug('csrf: Using web token');
  29       stats.eventHF('token.authenticated.web');
  30
  31       return oauthService
  32         .findOrGenerateWebToken(req.user.id)
  33         .spread(function(serverToken /*, client */) {
  34           setAccessToken(req, userId, serverToken);
  35           return null;
  36         });
  37     }
  38
  39     debug('csrf: Generating new anonymous token');
  40     stats.eventHF('token.anonymous.generate');
  41
  42     /* Generate an anonymous token */
  43     return oauthService.generateAnonWebToken().spread(function(token /*, client */) {
  44       setAccessToken(req, null, token);
  45       return null;
  46     });
  47   }
  48
  49   return validateUserAgentFromReq(req)
  50     .then(() => {
  51       /* OAuth clients have req.authInfo. Propagate their access token to their entire session
  52        * so that all related web-requests are made by the same client
  53        */
  54       if (req.authInfo && req.authInfo.accessToken) {
  55         debug('csrf: Using OAuth access token');
  56         setAccessToken(req, userId, req.authInfo.accessToken);
  57         return;
  58       }
  59
  60       var sessionAccessToken = getSessionAccessToken(req, userId);
  61       if (sessionAccessToken) {
  62         return oauthService
  63           .validateAccessTokenAndClient(sessionAccessToken)
  64           .then(function(tokenInfo) {
  65             if (!tokenInfo) {
  66               return generateAccessToken();
  67             }
  68
  69             req.accessToken = sessionAccessToken;
  70           })
  71           .catch(function(err) {
  72             // We shouldn't try to regenerate something that was revoked
  73             if (err.clientRevoked) {
  74               throw err;
  75             }
  76
  77             debug('csrf: OAuth access token validation failed: %j', err);
  78             // Refresh anonymous tokens
  79             return generateAccessToken();
  80           });
  81       }
  82
  83       return generateAccessToken();
  84     })
  85     .asCallback(next);
  86 };