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authortoasted-nutbread <toasted-nutbread@users.noreply.github.com>2021-07-31 12:30:31 -0400
committerGitHub <noreply@github.com>2021-07-31 12:30:31 -0400
commit00c5ae79833a641ccc5f7d31b6eea3e91db4cb71 (patch)
treee21cb14527e2bf6e74b36eeab75e994d52df37b6 /ext/js/language/dictionary-importer-media-loader.js
parent2d57d69b9ed3adf1241074f7eb29a588bec817a2 (diff)
DictionaryImporterMediaLoader (#1860)
* Rename param for consistency * Move media loading functionality into DictionaryImporterMediaLoader * Create test class for media loading * Remove unnecessary Blob/Image/URL functionality
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diff --git a/ext/js/language/dictionary-importer-media-loader.js b/ext/js/language/dictionary-importer-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/>.
+ */
+
+/* global
+ * MediaUtil
+ */
+
+/**
+ * Class used for loading and validating media during the dictionary import process.
+ */
+class DictionaryImporterMediaLoader {
+ /**
+ * 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 image = new Image();
+ const eventListeners = new EventListenerCollection();
+ const cleanup = () => {
+ image.removeAttribute('src');
+ URL.revokeObjectURL(url);
+ eventListeners.removeAllEventListeners();
+ };
+ eventListeners.addEventListener(image, 'load', () => {
+ const {naturalWidth: width, naturalHeight: height} = image;
+ cleanup();
+ resolve({width, height});
+ }, false);
+ eventListeners.addEventListener(image, 'error', () => {
+ cleanup();
+ reject(new Error('Image failed to load'));
+ }, false);
+ const blob = MediaUtil.createBlobFromBase64Content(content, mediaType);
+ const url = URL.createObjectURL(blob);
+ image.src = url;
+ });
+ }
+}