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diff --git a/addon-sdk/source/lib/sdk/ui/button/contract.js b/addon-sdk/source/lib/sdk/ui/button/contract.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+const { contract } = require('../../util/contract');
+const { isLocalURL } = require('../../url');
+const { isNil, isObject, isString } = require('../../lang/type');
+const { required, either, string, boolean, object, number } = require('../../deprecated/api-utils');
+const { merge } = require('../../util/object');
+const { freeze } = Object;
+
+const isIconSet = (icons) =>
+ Object.keys(icons).
+ every(size => String(size >>> 0) === size && isLocalURL(icons[size]));
+
+var iconSet = {
+ is: either(object, string),
+ map: v => isObject(v) ? freeze(merge({}, v)) : v,
+ ok: v => (isString(v) && isLocalURL(v)) || (isObject(v) && isIconSet(v)),
+ msg: 'The option "icon" must be a local URL or an object with ' +
+ 'numeric keys / local URL values pair.'
+}
+
+var id = {
+ is: string,
+ ok: v => /^[a-z-_][a-z0-9-_]*$/i.test(v),
+ msg: 'The option "id" must be a valid alphanumeric id (hyphens and ' +
+ 'underscores are allowed).'
+};
+
+var label = {
+ is: string,
+ ok: v => isNil(v) || v.trim().length > 0,
+ msg: 'The option "label" must be a non empty string'
+}
+
+var badge = {
+ is: either(string, number),
+ msg: 'The option "badge" must be a string or a number'
+}
+
+var badgeColor = {
+ is: string,
+ msg: 'The option "badgeColor" must be a string'
+}
+
+var stateContract = contract({
+ label: label,
+ icon: iconSet,
+ disabled: boolean,
+ badge: badge,
+ badgeColor: badgeColor
+});
+
+exports.stateContract = stateContract;
+
+var buttonContract = contract(merge({}, stateContract.rules, {
+ id: required(id),
+ label: required(label),
+ icon: required(iconSet)
+}));
+
+exports.buttonContract = buttonContract;
+
+exports.toggleStateContract = contract(merge({
+ checked: boolean
+}, stateContract.rules));
+
+exports.toggleButtonContract = contract(merge({
+ checked: boolean
+}, buttonContract.rules));
+