Add OpenID to CodiMD

With OpenID every OpenID capable provider can provide authentication for
users of a CodiMD instance. This means we have federated
authentication.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

6 files changed, 70 insertions, 3 deletions

diff --git a/lib/config/default.js b/lib/config/default.js
index cf7d2fc5..acfc2157 100644
--- a/lib/config/default.js
+++ b/lib/config/default.js
@@ -145,5 +145,6 @@ module.exports = {
   email: true,
   allowEmailRegister: true,
   allowGravatar: true,
-  allowPDFExport: true
+  allowPDFExport: true,
+  openID: true
 }
diff --git a/lib/config/environment.js b/lib/config/environment.js
index 6c4ce92f..65bacb4e 100644
--- a/lib/config/environment.js
+++ b/lib/config/environment.js
@@ -123,5 +123,6 @@ module.exports = {
   email: toBooleanConfig(process.env.CMD_EMAIL),
   allowEmailRegister: toBooleanConfig(process.env.CMD_ALLOW_EMAIL_REGISTER),
   allowGravatar: toBooleanConfig(process.env.CMD_ALLOW_GRAVATAR),
-  allowPDFExport: toBooleanConfig(process.env.CMD_ALLOW_PDF_EXPORT)
+  allowPDFExport: toBooleanConfig(process.env.CMD_ALLOW_PDF_EXPORT),
+  openID: toBooleanConfig(process.env.CMD_OPENID)
 }
diff --git a/lib/config/index.js b/lib/config/index.js
index 7d059c5c..f8b68e30 100644
--- a/lib/config/index.js
+++ b/lib/config/index.js
@@ -96,6 +96,7 @@ config.isGoogleEnable = config.google.clientID && config.google.clientSecret
 config.isDropboxEnable = config.dropbox.clientID && config.dropbox.clientSecret
 config.isTwitterEnable = config.twitter.consumerKey && config.twitter.consumerSecret
 config.isEmailEnable = config.email
+config.isOpenIDEnable = config.openID
 config.isGitHubEnable = config.github.clientID && config.github.clientSecret
 config.isGitLabEnable = config.gitlab.clientID && config.gitlab.clientSecret
 config.isMattermostEnable = config.mattermost.clientID && config.mattermost.clientSecret
diff --git a/lib/response.js b/lib/response.js
index d30f2a8d..9f1740c8 100644
--- a/lib/response.js
+++ b/lib/response.js
@@ -88,6 +88,7 @@ function showIndex (req, res, next) {
     email: config.isEmailEnable,
     allowEmailRegister: config.allowEmailRegister,
     allowPDFExport: config.allowPDFExport,
+    openID: config.isOpenIDEnable,
     signin: authStatus,
     infoMessage: req.flash('info'),
     errorMessage: req.flash('error'),
@@ -142,7 +143,8 @@ function responseCodiMD (res, note) {
     oauth2: config.isOAuth2Enable,
     email: config.isEmailEnable,
     allowEmailRegister: config.allowEmailRegister,
-    allowPDFExport: config.allowPDFExport
+    allowPDFExport: config.allowPDFExport,
+    openID: config.isOpenIDEnable
   })
 }
 
diff --git a/lib/web/auth/index.js b/lib/web/auth/index.js
index 61e7c3f9..86ab4b28 100644
--- a/lib/web/auth/index.js
+++ b/lib/web/auth/index.js
@@ -45,6 +45,7 @@ if (config.isLDAPEnable) authRouter.use(require('./ldap'))
 if (config.isSAMLEnable) authRouter.use(require('./saml'))
 if (config.isOAuth2Enable) authRouter.use(require('./oauth2'))
 if (config.isEmailEnable) authRouter.use(require('./email'))
+if (config.isOpenIDEnable) authRouter.use(require('./openid'))
 
 // logout
 authRouter.get('/logout', function (req, res) {
diff --git a/lib/web/auth/openid/index.js b/lib/web/auth/openid/index.js
new file mode 100644
index 00000000..96f61807
--- /dev/null
+++ b/lib/web/auth/openid/index.js
@@ -0,0 +1,61 @@
+'use strict'
+
+const Router = require('express').Router
+const passport = require('passport')
+const OpenIDStrategy = require('@passport-next/passport-openid').Strategy
+const config = require('../../../config')
+const models = require('../../../models')
+const logger = require('../../../logger')
+const {urlencodedParser} = require('../../utils')
+const {setReturnToFromReferer} = require('../utils')
+
+let openIDAuth = module.exports = Router()
+
+passport.use(new OpenIDStrategy({
+  returnURL: config.serverURL + '/auth/openid/callback',
+  realm: config.serverURL,
+  profile: true
+}, function (openid, profile, done) {
+  var stringifiedProfile = JSON.stringify(profile)
+  models.User.findOrCreate({
+    where: {
+      profileid: openid
+    },
+    defaults: {
+      profile: stringifiedProfile
+    }
+  }).spread(function (user, created) {
+    if (user) {
+      var needSave = false
+      if (user.profile !== stringifiedProfile) {
+        user.profile = stringifiedProfile
+        needSave = true
+      }
+      if (needSave) {
+        user.save().then(function () {
+          if (config.debug) { logger.info('user login: ' + user.id) }
+          return done(null, user)
+        })
+      } else {
+        if (config.debug) { logger.info('user login: ' + user.id) }
+        return done(null, user)
+      }
+    }
+  }).catch(function (err) {
+    logger.error('auth callback failed: ' + err)
+    return done(err, null)
+  })
+}))
+
+openIDAuth.post('/auth/openid', urlencodedParser, function (req, res, next) {
+  setReturnToFromReferer(req)
+  passport.authenticate('openid')(req, res, next)
+})
+
+// openID auth callback
+openIDAuth.get('/auth/openid/callback',
+  passport.authenticate('openid', {
+    successReturnToOrRedirect: config.serverurl + '/',
+    failureRedirect: config.serverurl + '/'
+  })
+)