SingleFile/extension/core/common/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, infobar, document, URL, Blob, MouseEvent, setTimeout, open */

const MAX_CONTENT_SIZE = 32 * (1024 * 1024);

export {
	downloadPage
};

async function downloadPage(pageData, options) {
	if (options.includeInfobar) {
		await 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,
				openSavedPage: options.openSavedPage,
				compressHTML: options.compressHTML,
				backgroundSave: options.backgroundSave,
				bookmarkId: options.bookmarkId,
				replaceBookmarkURL: options.replaceBookmarkURL,
				applySystemTheme: options.applySystemTheme,
				defaultEditorMode: options.defaultEditorMode,
				includeInfobar: options.includeInfobar,
				warnUnsavedPage: options.warnUnsavedPage
			};
			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 {
			await downloadPageForeground(pageData);
		}
		if (options.openSavedPage) {
			open(URL.createObjectURL(new Blob([pageData.content], { type: "text/html" })));
		}
		browser.runtime.sendMessage({ method: "ui.processEnd" });
	}
	await browser.runtime.sendMessage({ method: "downloads.end", taskId: options.taskId, hash: pageData.hash });
}

async 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);
	}
	return new Promise(resolve => setTimeout(resolve, 1));
}

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();
	}
}