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diff --git a/ext/js/language/dictionary-importer-worker-media-loader.js b/ext/js/language/dictionary-importer-worker-media-loader.js
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+/*
+ * Copyright (C) 2021 Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Class used for loading and validating media from a worker thread
+ * during the dictionary import process.
+ */
+class DictionaryImporterWorkerMediaLoader {
+ /**
+ * Creates a new instance of the media loader.
+ */
+ constructor() {
+ this._requests = new Map();
+ }
+
+ /**
+ * Handles a response message posted to the worker thread.
+ * @param params Details of the response.
+ */
+ handleMessage(params) {
+ const {id} = params;
+ const request = this._requests.get(id);
+ if (typeof request === 'undefined') { return; }
+ this._requests.delete(id);
+ const {error} = params;
+ if (typeof error !== 'undefined') {
+ request.reject(deserializeError(error));
+ } else {
+ request.resolve(params.result);
+ }
+ }
+
+ /**
+ * Attempts to load an image using a base64 encoded content and a media type
+ * and returns its resolution.
+ * @param mediaType The media type for the image content.
+ * @param content The binary content for the image, encoded in base64.
+ * @returns A Promise which resolves with {width, height} on success,
+ * otherwise an error is thrown.
+ */
+ getImageResolution(mediaType, content) {
+ return new Promise((resolve, reject) => {
+ const id = generateId(16);
+ this._requests.set(id, {resolve, reject});
+ self.postMessage({
+ action: 'getImageResolution',
+ params: {id, mediaType, content}
+ });
+ });
+ }
+}