56 lines
2.0 KiB
JavaScript
56 lines
2.0 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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module.metadata = {
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"stability": "unstable"
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};
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const { validateOptions: valid } = require("../deprecated/api-utils");
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const method = require("method/core");
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// Function takes property validation rules and returns function that given
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// an `options` object will return validated / normalized options back. If
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// option(s) are invalid validator will throw exception described by rules.
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// Returned will also have contain `rules` property with a given validation
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// rules and `properties` function that can be used to generate validated
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// property getter and setters can be mixed into prototype. For more details
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// see `properties` function below.
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function contract(rules) {
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const validator = (instance, options) => {
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return valid(options || instance || {}, rules);
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};
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validator.rules = rules
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validator.properties = function(modelFor) {
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return properties(modelFor, rules);
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}
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return validator;
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}
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exports.contract = contract
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// Function takes `modelFor` instance state model accessor functions and
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// a property validation rules and generates object with getters and setters
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// that can be mixed into prototype. Property accessors update model for the
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// given instance. If you wish to react to property updates you can always
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// override setters to put specific logic.
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function properties(modelFor, rules) {
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let descriptor = Object.keys(rules).reduce(function(descriptor, name) {
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descriptor[name] = {
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get: function() { return modelFor(this)[name] },
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set: function(value) {
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let change = {};
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change[name] = value;
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modelFor(this)[name] = valid(change, rules)[name];
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}
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}
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return descriptor
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}, {});
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return Object.create(Object.prototype, descriptor);
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}
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exports.properties = properties;
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const validate = method("contract/validate");
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exports.validate = validate;
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