settings for user

- enable federation for users

server/api/models/user.js

@@ -2,6 +2,7 @@
 const bcrypt = require('bcryptjs')
 const crypto = require('crypto')
 const util = require('util')
+const debug = require('debug')('model:user')
 
 const generateKeyPair = util.promisify(crypto.generateKeyPair)
 
@@ -14,6 +15,7 @@ module.exports = (sequelize, DataTypes) => {
       allowNull: false
     },
     display_name: DataTypes.STRING,
+    settings: DataTypes.JSON,
     email: {
       type: DataTypes.STRING,
       unique:  { msg: 'error.email_taken' },
@@ -51,6 +53,7 @@ module.exports = (sequelize, DataTypes) => {
 
   user.beforeSave(async (user, options) => {
     if (user.changed('password')) {
+      debug('Password for %s modified', user.username)
       const salt = await bcrypt.genSalt(10)
       const hash = await bcrypt.hash(user.password, salt)
       user.password = hash
@@ -58,6 +61,7 @@ module.exports = (sequelize, DataTypes) => {
   })
 
   user.beforeCreate(async (user, options) => {
+    debug('Create a new user => %s', user.username)
     // generate rsa keys
     const rsa = await generateKeyPair('rsa', {
       modulusLength: 4096,