Add support for configurably including strings

* Add json-loader to load JSON files via webpack
* Add a JSON file for string overrides
* Add a getter method to BaseString for an easier and more clearly
defined approach to accessing string values

awx/ui/client/assets/default.strings.json

@@ -0,0 +1,3 @@
+{
+
+}

awx/ui/client/lib/services/base-string.service.js

@@ -1,16 +1,61 @@
+import defaults from '../../assets/default.strings.json';
+
 let i18n;
 
 function BaseStringService (namespace) {
     let t = i18n._;
 
+    const ERROR_NO_NAMESPACE = t('BaseString cannot be extended without providing a namespace');
+    const ERROR_NO_STRING = t('No string exists with this name');
+
+    if (!namespace) {
+        throw new Error(ERROR_NO_NAMESPACE);
+    }
+
     this.t = t;
     this[namespace] = {};
 
+    /*
+     * These strings are globally relevant and configured to give priority to values in
+     * default.strings.json and fall back to defaults defined inline.
+     */
+    this.BRAND_NAME = defaults.BRAND_NAME || 'AWX';
+
+    /*
+     * Globally relevant strings should be defined here to avoid duplication of content across the
+     * the project.
+     */
     this.CANCEL = t('CANCEL');
     this.SAVE = t('SAVE');
     this.OK = t('OK');
-}
 
+    /**
+     * This getter searches the extending class' namespace first for a match then falls back to
+     * the more globally relevant strings defined here. Strings with with dots as delimeters are
+     * supported to give flexibility to extending classes to nest strings as necessary.
+     *
+     * If no match is found, an error is thrown to alert the developer immediately instead of
+     * failing silently.
+     */
+    this.get = name => {
+        let keys = name.split('.');
+        let value;
+
+        keys.forEach(key => {
+            if (!value) {
+                value = this[namespace][key] || this[key];
+            } else {
+                value = value[key];
+            }
+
+            if (!value) {
+                throw new Error(ERROR_NO_STRING);
+            }
+        });
+
+        return value;
+    };
+}
 
 function BaseStringServiceLoader (_i18n_) {
     i18n = _i18n_;

awx/ui/package.json

@@ -63,6 +63,7 @@
     "jshint": "^2.9.4",
     "jshint-loader": "^0.8.3",
     "jshint-stylish": "^2.2.0",
+    "json-loader": "^0.5.4",
     "karma": "^1.4.1",
     "karma-chrome-launcher": "^1.0.1",
     "karma-coverage": "^1.1.1",

awx/ui/webpack.config.js

@@ -69,19 +69,27 @@ var baseConfig = function() {
             new webpack.optimize.CommonsChunkPlugin('vendor', 'tower.vendor.js')
         ],
         module: {
-            loaders: [{
-                // disable AMD loading (broken in this lib) and default to CommonJS (not broken)
-                test: /\.angular-tz-extensions.js$/,
-                loader: 'imports?define=>false'
-            }, {
-                // es6 -> es5
-                test: /\.js$/,
-                loader: 'babel-loader',
-                exclude: /(node_modules)/,
-                query: {
-                    presets: ['es2015']
+            loaders: [
+                {
+                    // disable AMD loading (broken in this lib) and default to CommonJS (not broken)
+                    test: /\.angular-tz-extensions.js$/,
+                    loader: 'imports?define=>false'
+                },
+                {
+                    // es6 -> es5
+                    test: /\.js$/,
+                    loader: 'babel-loader',
+                    exclude: /(node_modules)/,
+                    query: {
+                        presets: ['es2015']
+                    }
+                },
+                {
+                    test: /\.json$/,
+                    loader: 'json-loader',
+                    exclude: /(node_modules)/
                 }
-            }]
+            ]
         },
         resolve: {
             alias: {