ghost/core/server/services/auth/session/store.js

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const {Store} = require('express-session');
const {InternalServerError} = require('@tryghost/errors');

module.exports = class SessionStore extends Store {
    constructor(SessionModel) {
        super();
        this.SessionModel = SessionModel;
    }

    destroy(sid, callback) {
        this.SessionModel
            .destroy({session_id: sid})
            .then(() => {
                callback(null);
            })
            .catch(callback);
    }

    get(sid, callback) {
        this.SessionModel
            .findOne({session_id: sid})
            .then((model) => {
                if (!model) {
                    return callback(null, null);
                }
                callback(null, model.get('session_data'));
            })
            .catch(callback);
    }

    set(sid, sessionData, callback) {
        if (!sessionData.user_id) {
            return callback(new InternalServerError({
                message: 'Cannot create a session with no user_id'
            }));
        }
        this.SessionModel
            .upsert({session_data: sessionData}, {session_id: sid})
            .then(() => {
                callback(null);
            })
            .catch(callback);
    }
};