diff options
Diffstat (limited to 'src/drive-google-com-fix-download/google_drive_files.js')
| -rw-r--r-- | src/drive-google-com-fix-download/google_drive_files.js | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/drive-google-com-fix-download/google_drive_files.js b/src/drive-google-com-fix-download/google_drive_files.js new file mode 100644 index 0000000..f93194b --- /dev/null +++ b/src/drive-google-com-fix-download/google_drive_files.js @@ -0,0 +1,168 @@ +/** + * SPDX-License-Identifier: LicenseRef-GPL-3.0-or-later-WITH-js-exceptions + * + * Make files on drive.google.com downloadable without nonfree js + * + * Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org> + * + * 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. + * + * As additional permission under GNU GPL version 3 section 7, you + * may distribute forms of that code without the copy of the GNU + * GPL normally required by section 4, provided you include this + * license notice and, in case of non-source distribution, a URL + * through which recipients can access the Corresponding Source. + * If you modify file(s) with this exception, you may extend this + * exception to your version of the file(s), but you are not + * obligated to do so. If you do not wish to do so, delete this + * exception statement from your version. + * + * As a special exception to the GPL, any HTML file which merely + * makes function calls to this code, and for that purpose + * includes it by reference shall be deemed a separate work for + * copyright law purposes. If you modify this code, you may extend + * this exception to your version of the code, but you are not + * obligated to do so. If you do not wish to do so, delete this + * exception statement from your version. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + * + * I, Wojtek Kosior, thereby promise not to sue for violation of this file's + * license. Although I request that you do not make use of this code in a + * proprietary program, I am not going to enforce this in court. + */ + +/* Use with: https://drive.google.com/file/d/** */ + +const og = {}; + +for (const node of document.head.childNodes) { + if (node.tagName === "STYLE") { + document.head.removeChild(node); + continue; + } + + if (node.tagName !== "META") + continue; + + const match = /^og:(.+)/.exec(node.getAttribute("property")); + if (!match) + continue; + + og[match[1]] = node.getAttribute("content"); +} + +const match = new RegExp("/file/d/([^/]+)").exec(document.URL); +const file_id = match && match[1]; + +/* Extract file's mime type from script. */ + +let mime_type; + +for (const script of document.scripts) { + const match = /itemJson\s*:\s*(\[.*\])\s*}\s*;$/.exec(script.textContent); + if (!match) + continue; + + let data; + try { + data = JSON.parse(match[1]); + } catch(e) { + console.log(e); + continue; + } + + if (/^[^\/]+\/[^\/]+$/.test(data[11])) + mime_type = data[11]; +} + +/* If file is folder, redirect to its page. */ + +const redirect = file_id && + /^application\/vnd.google-apps.(folder|shortcut)$/.test(mime_type); +if (redirect) + window.location.href = `https://drive.google.com/drive/folders/${file_id}`; + +const download_link = + file_id && `https://drive.google.com/uc?export=download&id=${file_id}`; + +const body = document.createElement("body"); +const name_div = document.createElement("div"); +const download_div = document.createElement("div"); +const download_button = document.createElement("a"); +const type_div = document.createElement("div"); +const type_span = document.createElement("span"); +const show_image_div = document.createElement("div"); +const show_image_button = document.createElement("button"); +const image = document.createElement("img"); + + +let button_text = "download"; + +if (!og.title) + button_text += " file"; +else + name_div.textContent = og.title; + +name_div.setAttribute("style", "font-weight: bold; display:inline-block;"); + + +if (download_link) + download_button.setAttribute("href", download_link); +else + button_text += " (unavailable)"; + +download_button.textContent = button_text; +download_button.setAttribute("style", "border-radius: 5px; padding: 10px; color: black; background-color: lightgreen; text-decoration: none; box-shadow: -4px 8px 8px #888;"); + + +download_div.appendChild(download_button); +download_div.setAttribute("style", "padding: 10px; display: inline-block; margin: 0 0 10px;"); + + +type_span.textContent = "type: "; +type_span.setAttribute("style", "font-weight: bold; display:inline-block; white-space: pre;"); + +type_div.setAttribute("style", "margin: 0 0 10px;"); +type_div.appendChild(type_span); +if (mime_type || og.type) + type_div.append(mime_type || og.type); + + +function show_image() +{ + const image = document.createElement("img"); + image.setAttribute("src", og.image); + image.setAttribute("width", og["image:width"]); + image.setAttribute("height", og["image:height"]); + image.setAttribute("style", "border: 1px solid #eee;"); + + document.body.replaceChild(image, show_image_div); +} + +show_image_button.setAttribute("style", "border-radius: 5px; padding: 10px; color: black; background-color: lightgreen; box-shadow: -4px 8px 8px #888; font-family: inherit; font-size: inherit; border: none;"); +show_image_button.textContent = "show image"; +show_image_button.addEventListener("click", show_image); +show_image_div.appendChild(show_image_button); + + +body.setAttribute("style", "margin: 20px;"); +if (og.title) + body.appendChild(name_div); +body.appendChild(download_div); +if (og.type) + body.appendChild(type_div); +if (og.image && og["image:width"] && og["image:height"]) + body.appendChild(show_image_div); + +if (!redirect) + document.documentElement.replaceChild(body, document.body); |