# Session Service

## Usage

```js
const SessionService = require('@tryghost/session-service');

const sessionService = SessionService({
    async getSession(req, res) {
        return new Promise((resolve, reject) => {
            require('express-session')(config)(req, res, (err) => {
                if (err) {
                    reject(err);
                }
                resolve(req.session);
            })
        })
    },
    async findUserById({id}) {
        return UserModel.findUserById(id);
    },
    getOriginOfRequest(req) {
        return req.headers.origin;
    }
});

app.use(async function sessionMiddleware(req, res, next) {
    try {
        const user = await sessionService.getUserForSession(req, res);
        req.user = user;
        next();
    } catch (err) {
        next(err);
    }
});

app.post('/login', async (req, res) => {
    try {
        const user = await UserModel.verify(req.body);
        await sessionService.createSessionForUser(req, res, user);
        res.redirect('/home');
    } catch (err) {
        return next(err);
    }
});

app.post('/logout', async (req, res) => {
   try {
        await sessionService.destroyCurrentSession(req, res);
        res.redirect('/login');
    } catch (err) {
        return next(err);
    }
});
```