Factor out duplication of resource limit i18n

src/utils/ErrorUtils.js

@@ -0,0 +1,50 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { _t } from '../languageHandler';
+
+/**
+ * Produce a translated error message for a
+ * M_RESOURCE_LIMIT_EXCEEDED error
+ *
+ * @param {string} limitType The limit_type from the error
+ * @param {string} adminContact The admin_contact from the error
+ * @param {Object} strings Translateable string for different
+ *     limit_type. Must include at least the empty string key
+ *     which is the default. Strings may include an 'a' tag
+ *     for the admin contact link.
+ * @param {Object} extraTranslations Extra translation substitution functions
+ *     for any tags in the strings apart from 'a'
+ * @returns {*} Translated string or react component
+ */
+export function messageForResourceLimitError(limitType, adminContact, strings, extraTranslations) {
+    let errString = strings[limitType];
+    if (errString === undefined) errString = strings[''];
+
+    const linkSub = sub => {
+        if (adminContact) {
+            return <a href={adminContact} target="_blank" rel="noopener">{sub}</a>;
+        } else {
+            return sub;
+        }
+    };
+
+    if (errString.includes('<a>')) {
+        return _t(errString, {}, Object.assign({ 'a': linkSub }, extraTranslations));
+    } else {
+        return _t(errString, {}, extraTranslations);
+    }
+}