SingleFile/extension/core/content/content-download.js

/*
 * Copyright 2010-2020 Gildas Lormeau
 * contact : gildas.lormeau <at> gmail.com
 * 
 * This file is part of SingleFile.
 *
 *   The code in this file is free software: you can redistribute it and/or 
 *   modify it under the terms of the GNU Affero General Public License 
 *   (GNU AGPL) as published by the Free Software Foundation, either version 3
 *   of the License, or (at your option) any later version.
 * 
 *   The code in this file 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 Affero 
 *   General Public License for more details.
 *
 *   As additional permission under GNU AGPL version 3 section 7, you may 
 *   distribute UNMODIFIED VERSIONS OF THIS file without the copy of the GNU 
 *   AGPL normally required by section 4, provided you include this license 
 *   notice and a URL through which recipients can access the Corresponding 
 *   Source.
 */

/* global browser, document, URL, Blob, MouseEvent */

this.singlefile.extension.core.content.download = this.singlefile.extension.core.content.download || (() => {

	const singlefile = this.singlefile;

	const MAX_CONTENT_SIZE = 32 * (1024 * 1024);

	return { downloadPage };

	async function downloadPage(pageData, options) {
		if (options.includeInfobar) {
			await singlefile.common.ui.content.infobar.includeScript(pageData);
		}
		if (options.includeBOM) {
			pageData.content = "\ufeff" + pageData.content;
		}
		if (options.backgroundSave || options.openEditor || options.saveToGDrive) {
			for (let blockIndex = 0; blockIndex * MAX_CONTENT_SIZE < pageData.content.length; blockIndex++) {
				const message = {
					method: "downloads.download",
					taskId: options.taskId,
					confirmFilename: options.confirmFilename,
					filenameConflictAction: options.filenameConflictAction,
					filename: pageData.filename,
					saveToClipboard: options.saveToClipboard,
					saveToGDrive: options.saveToGDrive,
					forceWebAuthFlow: options.forceWebAuthFlow,
					extractAuthCode: options.extractAuthCode,
					filenameReplacementCharacter: options.filenameReplacementCharacter,
					openEditor: options.openEditor,
					compressHTML: options.compressHTML,
					backgroundSave: options.backgroundSave,
					bookmarkId: options.bookmarkId,
					replaceBookmarkURL: options.replaceBookmarkURL
				};
				message.truncated = pageData.content.length > MAX_CONTENT_SIZE;
				if (message.truncated) {
					message.finished = (blockIndex + 1) * MAX_CONTENT_SIZE > pageData.content.length;
					message.content = pageData.content.substring(blockIndex * MAX_CONTENT_SIZE, (blockIndex + 1) * MAX_CONTENT_SIZE);
				} else {
					message.content = pageData.content;
				}
				await browser.runtime.sendMessage(message);
			}
		} else {
			if (options.saveToClipboard) {
				saveToClipboard(pageData);
			} else {
				downloadPageForeground(pageData);
			}
			browser.runtime.sendMessage({ method: "ui.processEnd" });
		}
		await browser.runtime.sendMessage({ method: "downloads.end", taskId: options.taskId, hash: pageData.hash });
	}

	function downloadPageForeground(pageData) {
		if (pageData.filename && pageData.filename.length) {
			const link = document.createElement("a");
			link.download = pageData.filename;
			link.href = URL.createObjectURL(new Blob([pageData.content], { type: "text/html" }));
			link.dispatchEvent(new MouseEvent("click"));
			URL.revokeObjectURL(link.href);
		}
	}

	function saveToClipboard(page) {
		const command = "copy";
		document.addEventListener(command, listener);
		document.execCommand(command);
		document.removeEventListener(command, listener);

		function listener(event) {
			event.clipboardData.setData("text/html", page.content);
			event.clipboardData.setData("text/plain", page.content);
			event.preventDefault();
		}
	}

})();