[oauth] start oauth auth_code server implementation

server/api/models/oauth_token.js

@@ -0,0 +1,15 @@
+
+module.exports = (sequelize, DataTypes) => {
+  const OAuthToken = sequelize.define('oauth_token', {
+    access_token: DataTypes.STRING,
+    refresh_token: DataTypes.STRING,
+    scope: DataTypes.STRING,
+  }, {})
+
+  OAuthToken.associate = function (models) {
+    OAuthToken.belongsTo(models.user)
+    OAuthToken.belongsTo(models.oauth_client)
+  }
+
+  return OAuthToken
+}