feat: add keycloak auth provider (#1004)

* added custom keycloak authentication.

* update readme.

* updated readme.

* reverted README for PR.

* fix: use async/await

* changed callback parameter name from done to cb.

* fix: keycloak description + website

* fix: keycloak logo

server/modules/authentication/keycloak/authentication.js

@@ -0,0 +1,41 @@
+const _ = require('lodash')
+
+/* global WIKI */
+
+// ------------------------------------
+// Keycloak Account
+// ------------------------------------
+
+const KeycloakStrategy = require('@exlinc/keycloak-passport')
+
+module.exports = {
+  init (passport, conf) {
+    passport.use('keycloak',
+      new KeycloakStrategy({
+	      authorizationURL: conf.authorizationURL,
+	      userInfoURL: conf.userInfoURL,
+        tokenURL: conf.tokenURL,
+	      host: conf.host,
+        realm: conf.realm,
+        clientID: conf.clientId,
+        clientSecret: conf.clientSecret,
+        callbackURL: conf.callbackURL
+      }, async (accessToken, refreshToken, profile, cb) => {
+        try {
+          const user = await WIKI.models.users.processProfile({
+            profile: {
+              id: profile.keycloakId,
+              email: profile.email,
+              name: profile.username,
+              picture: ''
+            },
+            providerKey: 'keycloak'
+          })
+          cb(null, user)
+        } catch (err) {
+          cb(err, null)
+        }
+      })
+    )
+  }
+}