salix/modules/account/back/methods/user-account/sync.js

const SyncEngine = require('../../util/sync-engine');

module.exports = Self => {
    Self.remoteMethod('sync', {
        description: 'Synchronizes the user with the other user databases',
        accepts: [
            {
                arg: 'userName',
                type: 'string',
                description: 'The user name',
                required: true
            }, {
                arg: 'password',
                type: 'string',
                description: 'The password'
            }
        ],
        http: {
            path: `/:userName/sync`,
            verb: 'PATCH'
        }
    });

    Self.sync = async function(userName, password) {
        let $ = Self.app.models;

        let user = await $.Account.findOne({
            fields: ['id'],
            where: {name: userName}
        });
        let isSync = !await $.UserSync.exists(userName);

        if (user && isSync) return;

        let err;
        let se = new SyncEngine();
        await se.init($);

        try {
            await se.sync(userName, password, true);
            await $.UserSync.destroyById(userName);
        } catch (e) {
            err = e;
        }

        await se.deinit();
        if (err) throw err;
    };
};