Added support for Datatables

Added support for ajax-based server side validation (useful for validation of emails, duplicate usernames, etc.)
User form more or less ready in the basic version (i.e. without permission management)

lib/models/namespaces.js

@@ -1,81 +0,0 @@
-'use strict';
-
-const knex = require('../knex');
-const hasher = require('node-object-hash')();
-const { enforce, filterObject } = require('../helpers');
-const interoperableErrors = require('../../shared/interoperable-errors');
-
-const allowedKeys = new Set(['id', 'name', 'description', 'parent']);
-const allowedUpdateKeys = new Set(['name', 'description', 'parent']);
-
-async function list() {
-    return await knex('namespaces');
-}
-
-function hash(ns) {
-    return hasher.hash(filterObject(ns, allowedKeys));
-}
-
-async function getById(nsId) {
-    const ns = await knex('namespaces').where('id', nsId).first();
-    if (!ns) {
-        throw new interoperableErrors.NotFoundError();
-    }
-
-    ns.hash = hash(ns);
-
-    return ns;
-}
-
-async function create(ns) {
-    const nsId = await knex('namespaces').insert(filterObject(ns, allowedKeys));
-    return nsId;
-}
-
-async function updateWithConsistencyCheck(ns) {
-    enforce(ns.id !== 1 || ns.parent === null, 'Cannot assign a parent to the root namespace.');
-
-    await knex.transaction(async tx => {
-        const existingNs = await tx('namespaces').where('id', ns.id).first();
-        if (!ns) {
-            throw new interoperableErrors.NotFoundError();
-        }
-
-        const existingNsHash = hash(existingNs);
-        if (existingNsHash != ns.originalHash) {
-            throw new interoperableErrors.ChangedError();
-        }
-
-        let iter = ns;
-        while (iter.parent != null) {
-            iter = await tx('namespaces').where('id', iter.parent).first();
-            if (iter.id == ns.id) {
-                throw new interoperableErrors.LoopDetectedError();
-            }
-        }
-
-        await tx('namespaces').where('id', ns.id).update(filterObject(ns, allowedUpdateKeys));
-    });
-}
-
-async function remove(nsId) {
-    enforce(nsId !== 1, 'Cannot delete the root namespace.');
-
-    await knex.transaction(async tx => {
-        const childNs = await tx('namespaces').where('parent', nsId).first();
-        if (childNs) {
-            throw new interoperableErrors.ChildDetectedError();
-        }
-
-        await tx('namespaces').where('id', nsId).del();
-    });
-}
-
-module.exports = {
-    hash,
-    list,
-    getById,
-    create,
-    updateWithConsistencyCheck,
-    remove
-};