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+/*
+ * Copyright (C) 2020-2021 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/>.
+ */
+
+/**
+ * MediaUtility is a class containing helper methods related to media processing.
+ */
+class MediaUtility {
+ /**
+ * Gets the file extension of a file path. URL search queries and hash
+ * fragments are not handled.
+ * @param path The path to the file.
+ * @returns The file extension, including the '.', or an empty string
+ * if there is no file extension.
+ */
+ getFileNameExtension(path) {
+ const match = /\.[^./\\]*$/.exec(path);
+ return match !== null ? match[0] : '';
+ }
+
+ /**
+ * Gets an image file's media type using a file path.
+ * @param path The path to the file.
+ * @returns The media type string if it can be determined from the file path,
+ * otherwise null.
+ */
+ getImageMediaTypeFromFileName(path) {
+ switch (this.getFileNameExtension(path).toLowerCase()) {
+ case '.apng':
+ return 'image/apng';
+ case '.bmp':
+ return 'image/bmp';
+ case '.gif':
+ return 'image/gif';
+ case '.ico':
+ case '.cur':
+ return 'image/x-icon';
+ case '.jpg':
+ case '.jpeg':
+ case '.jfif':
+ case '.pjpeg':
+ case '.pjp':
+ return 'image/jpeg';
+ case '.png':
+ return 'image/png';
+ case '.svg':
+ return 'image/svg+xml';
+ case '.tif':
+ case '.tiff':
+ return 'image/tiff';
+ case '.webp':
+ return 'image/webp';
+ default:
+ return null;
+ }
+ }
+
+ /**
+ * Gets the file extension for a corresponding media type.
+ * @param mediaType The media type to use.
+ * @returns A file extension including the dot for the media type,
+ * otherwise null.
+ */
+ getFileExtensionFromImageMediaType(mediaType) {
+ switch (mediaType) {
+ case 'image/apng':
+ return '.apng';
+ case 'image/bmp':
+ return '.bmp';
+ case 'image/gif':
+ return '.gif';
+ case 'image/x-icon':
+ return '.ico';
+ case 'image/jpeg':
+ return '.jpeg';
+ case 'image/png':
+ return '.png';
+ case 'image/svg+xml':
+ return '.svg';
+ case 'image/tiff':
+ return '.tiff';
+ case 'image/webp':
+ return '.webp';
+ default:
+ return null;
+ }
+ }
+
+ /**
+ * Gets the file extension for a corresponding media type.
+ * @param mediaType The media type to use.
+ * @returns A file extension including the dot for the media type,
+ * otherwise null.
+ */
+ getFileExtensionFromAudioMediaType(mediaType) {
+ switch (mediaType) {
+ case 'audio/mpeg':
+ case 'audio/mp3':
+ return '.mp3';
+ case 'audio/mp4':
+ return '.mp4';
+ case 'audio/ogg':
+ case 'audio/vorbis':
+ return '.ogg';
+ case 'audio/vnd.wav':
+ case 'audio/wave':
+ case 'audio/wav':
+ case 'audio/x-wav':
+ case 'audio/x-pn-wav':
+ return '.wav';
+ case 'audio/flac':
+ return '.flac';
+ case 'audio/webm':
+ return '.webm';
+ default:
+ return null;
+ }
+ }
+}