cloudron-box/src/backups.js

'use strict';

exports = module.exports = {
    get,
    getByIdentifierAndStatePaged,
    getByTypePaged,
    add,
    update,
    setState,
    list,
    del,

    BACKUP_IDENTIFIER_BOX: 'box',
    BACKUP_IDENTIFIER_MAIL: 'mail',

    BACKUP_TYPE_APP: 'app',
    BACKUP_TYPE_BOX: 'box',
    BACKUP_TYPE_MAIL: 'mail',

    BACKUP_STATE_NORMAL: 'normal', // should rename to created to avoid listing in UI?
    BACKUP_STATE_CREATING: 'creating',
    BACKUP_STATE_ERROR: 'error',
};

const assert = require('assert'),
    BoxError = require('./boxerror.js'),
    database = require('./database.js'),
    hat = require('./hat.js'),
    safe = require('safetydance');

const BACKUPS_FIELDS = [ 'id', 'remotePath', 'label', 'identifier', 'creationTime', 'packageVersion', 'type', 'dependsOnJson', 'state', 'manifestJson', 'preserveSecs', 'encryptionVersion', 'appConfigJson', 'targetId' ].join(',');

function postProcess(result) {
    assert.strictEqual(typeof result, 'object');

    result.dependsOn = result.dependsOnJson ? safe.JSON.parse(result.dependsOnJson) : [];
    delete result.dependsOnJson;

    result.manifest = result.manifestJson ? safe.JSON.parse(result.manifestJson) : null;
    delete result.manifestJson;

    result.appConfig = result.appConfigJson ? safe.JSON.parse(result.appConfigJson) : null;
    delete result.appConfigJson;

    return result;
}

async function add(data) {
    assert(data && typeof data === 'object');
    assert.strictEqual(typeof data.remotePath, 'string');
    assert(data.encryptionVersion === null || typeof data.encryptionVersion === 'number');
    assert.strictEqual(typeof data.packageVersion, 'string');
    assert.strictEqual(typeof data.type, 'string');
    assert.strictEqual(typeof data.identifier, 'string');
    assert.strictEqual(typeof data.state, 'string');
    assert(Array.isArray(data.dependsOn));
    assert.strictEqual(typeof data.manifest, 'object');
    assert.strictEqual(typeof data.preserveSecs, 'number');
    assert.strictEqual(typeof data.appConfig, 'object');
    assert.strictEqual(typeof data.targetId, 'string');

    const creationTime = data.creationTime || new Date(); // allow tests to set the time
    const manifestJson = JSON.stringify(data.manifest);
    const prefixId = data.type === exports.BACKUP_TYPE_APP ? `${data.type}_${data.identifier}` : data.type; // type and identifier are same for other types
    const id = `${prefixId}_v${data.packageVersion}_${hat(32)}`; // id is used by the UI to derive dependent packages. making this a UUID will require a lot of db querying
    const appConfigJson = data.appConfig ? JSON.stringify(data.appConfig) : null;

    const [error] = await safe(database.query('INSERT INTO backups (id, remotePath, identifier, encryptionVersion, packageVersion, type, creationTime, state, dependsOnJson, manifestJson, preserveSecs, appConfigJson, targetId) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)',
        [ id, data.remotePath, data.identifier, data.encryptionVersion, data.packageVersion, data.type, creationTime, data.state, JSON.stringify(data.dependsOn), manifestJson, data.preserveSecs, appConfigJson, data.targetId ]));

    if (error && error.code === 'ER_DUP_ENTRY') throw new BoxError(BoxError.ALREADY_EXISTS, 'Backup already exists');
    if (error) throw error;

    return id;
}

async function getByIdentifierAndStatePaged(identifier, state, page, perPage) {
    assert.strictEqual(typeof identifier, 'string');
    assert.strictEqual(typeof state, 'string');
    assert(typeof page === 'number' && page > 0);
    assert(typeof perPage === 'number' && perPage > 0);

    const results = await database.query(`SELECT ${BACKUPS_FIELDS} FROM backups WHERE identifier = ? AND state = ? ORDER BY creationTime DESC LIMIT ?,?`, [ identifier, state, (page-1)*perPage, perPage ]);

    results.forEach(function (result) { postProcess(result); });

    return results;
}

async function get(id) {
    assert.strictEqual(typeof id, 'string');

    const result = await database.query(`SELECT ${BACKUPS_FIELDS} FROM backups WHERE id = ? ORDER BY creationTime DESC`, [ id ]);
    if (result.length === 0) return null;

    return postProcess(result[0]);
}

async function getByTypePaged(type, page, perPage) {
    assert.strictEqual(typeof type, 'string');
    assert(typeof page === 'number' && page > 0);
    assert(typeof perPage === 'number' && perPage > 0);

    const results = await database.query(`SELECT ${BACKUPS_FIELDS} FROM backups WHERE type = ? ORDER BY creationTime DESC LIMIT ?,?`, [ type, (page-1)*perPage, perPage ]);

    results.forEach(function (result) { postProcess(result); });

    return results;
}

function validateLabel(label) {
    assert.strictEqual(typeof label, 'string');

    if (label.length >= 200) return new BoxError(BoxError.BAD_FIELD, 'label too long');
    if (/[^a-zA-Z0-9._() -]/.test(label)) return new BoxError(BoxError.BAD_FIELD, 'label can only contain alphanumerals, space, dot, hyphen, brackets or underscore');

    return null;
}

// this is called by REST API
async function update(id, data) {
    assert.strictEqual(typeof id, 'string');
    assert.strictEqual(typeof data, 'object');

    let error;
    if ('label' in data) {
        error = validateLabel(data.label);
        if (error) throw error;
    }

    const fields = [], values = [];
    for (const p in data) {
        if (p === 'label' || p === 'preserveSecs') {
            fields.push(p + ' = ?');
            values.push(data[p]);
        }
    }
    values.push(id);

    const backup = await get(id);
    if (backup === null) throw new BoxError(BoxError.NOT_FOUND, 'Backup not found');

    const result = await database.query('UPDATE backups SET ' + fields.join(', ') + ' WHERE id = ?', values);
    if (result.affectedRows !== 1) throw new BoxError(BoxError.NOT_FOUND, 'Backup not found');

    if ('preserveSecs' in data) {
        // update the dependancies
        for (const depId of backup.dependsOn) {
            await database.query('UPDATE backups SET preserveSecs=? WHERE id = ?', [ data.preserveSecs, depId]);
        }
    }
}

async function setState(id, state) {
    assert.strictEqual(typeof id, 'string');
    assert.strictEqual(typeof state, 'string');

    const result = await database.query('UPDATE backups SET state = ? WHERE id = ?', [state, id]);
    if (result.affectedRows !== 1) throw new BoxError(BoxError.NOT_FOUND, 'Backup not found');
}

async function list(page, perPage) {
    assert(typeof page === 'number' && page > 0);
    assert(typeof perPage === 'number' && perPage > 0);

    const results = await database.query(`SELECT ${BACKUPS_FIELDS} FROM backups ORDER BY creationTime DESC LIMIT ?,?`, [ (page-1)*perPage, perPage ]);

    results.forEach(function (result) { postProcess(result); });

    return results;
}

async function del(id) {
    assert.strictEqual(typeof id, 'string');

    const result = await database.query('DELETE FROM backups WHERE id=?', [ id ]);
    if (result.affectedRows !== 1) throw new BoxError(BoxError.NOT_FOUND, 'Backup not found');
}