/**
* SPDX-License-Identifier: LicenseRef-GPL-3.0-or-later-WITH-js-exceptions
*
* Make folders on drive.google.com browsable 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/drive/folders/*** */
/* Define how to handle various mime types used by Google. */
const known_mimes = {
"application/vnd.google-apps.folder": {
links: id => ({
view: `https://drive.google.com/drive/folders/${id}`
}),
type: "folder",
is_folder: true
},
"application/vnd.google-apps.shortcut": {
links: id => ({
view: `https://drive.google.com/drive/folders/${id}`
}),
type: "shortcut",
is_folder: true
},
"application/vnd.google-apps.document": {
links: id => ({
view: `https://docs.google.com/document/d/${id}`,
download: `https://docs.google.com/document/d/${id}/export?format=odt`,
}),
type: "Google text document",
new_mime: "application/vnd.oasis.opendocument.text"
},
"application/vnd.google-apps.spreadsheet": {
links: id => ({
view: `https://docs.google.com/spreadsheets/d/${id}`,
download: `https://docs.google.com/spreadsheets/d/${id}/export?format=ods`
}),
type: "Google spreadsheet",
new_mime: "application/vnd.oasis.opendocument.spreadsheet"
},
"application/vnd.google-apps.presentation": {
links: id => ({
view: `https://docs.google.com/presentation/d/${id}`,
download: `https://docs.google.com/presentation/d/${id}/export/pptx`
}),
type: "Google presentation",
new_mime: "application/vnd.openxmlformats-officedocument.presentationml.presentation"
},
"application/vnd.google-apps.drawing": {
links: id => ({
view: `https://docs.google.com/drawings/d/${id}`,
download: `https://docs.google.com/drawings/d/${id}/export/jpeg`
}),
type: "Google drawing",
new_mime: "image/jpeg"
},
"application/vnd.google-apps.script": {
links: id => ({
download: `https://script.google.com/feeds/download/export?format=json&id=${id}`
}),
type: "Google script",
new_mime: "application/vnd.google-apps.script+json"
},
"application/vnd.google-apps.jam": {
links: id => ({
download: `https://jamboard.google.com/export?id=${id}`
}),
type: "Google jam",
new_mime: "application/pdf"
}
};
/*
* Human-friendly names defined here will be displayed to the user instead of
* raw mime types. Please add more here.
*/
let mime_display_overrides = {
"image/jpeg": "JPEG image",
"application/octet-stream": "binary data",
"application/pdf": "PDF document",
"application/rar": "RAR archive",
"application/zip": "ZIP archive"
};
let default_link_producer = id => ({
view: `https://drive.google.com/file/d/${id}`,
download: `https://drive.google.com/uc?export=download&id=${id}`
});
for (const [mime, display_name] of Object.entries(mime_display_overrides)) {
known_mimes[mime] = {
links: default_link_producer,
type: display_name,
new_mime: mime
}
}
delete mime_display_overrides;
function get_mime_info(mime) {
return known_mimes[mime] || {
links: default_link_producer,
type: mime || "",
new_mime: mime || "application/octet-stream"
}
}
/* Prepare folder contents data as well as data regarding the folder itself. */
const content = new Map();
function add_content_item(item)
{
const old_item = content.get(item.id) || {};
Object.assign(old_item, item);
content.set(item.id, old_item);
}
const this_folder = {};
function replace_string_escape(match, group)
{
return String.fromCharCode(`0x${group}`);
}
function try_parse(data, replace_x_escapes)
{
if (!data)
return null;
if (replace_x_escapes)
data = data.replaceAll(/\\x([0-9a-f]{2})/g, replace_string_escape);
try {
return JSON.parse(data);
} catch (e) {
console.log(e);
}
return null;
}
function process_file_data(file_data, callback)
{
if (!Array.isArray(file_data) || !typeof file_data[0] === "string") {
console.log("cannot process the following file data object:",
file_data);
return;
}
const result = {id: file_data[0], folders: []};
if (Array.isArray(file_data[1])) {
for (const item of file_data[1]) {
if (typeof item === "string" && item !== this_folder.id)
result.folders.push(item);
}
}
if (typeof file_data[2] === "string")
result.filename = file_data[2];
if (typeof file_data[3] === "string" && file_data[3].search("/") >= 0)
result.mime = file_data[3];
if (typeof file_data[9] === "number")
result.date1 = new Date(file_data[9]);
if (typeof file_data[10] === "number")
result.date2 = new Date(file_data[10]);
callback(result);
}
/*
* By searching for scripts with calls to AF_initDataCallback we get about 7
* matches. All arguments to this function seem to be arrays parseable as JSON,
* but their contents are very different and only two of those ~7 arrays
* actually hold some data useful to us. Here we try to filter out the other
* cases and then extract the useful data.
*/
function process_af_init_data(data)
{
if (!Array.isArray(data) || !/^driveweb/.test(data[0]) ||
!Array.isArray(data[1]))
return;
/* First useful "kind" of object we can encounter is this folder's data. */
if (typeof data[1][0] === "string") {
process_file_data(data[1], item => Object.assign(this_folder, item));
return;
}
/*
* Second "kind" of object holds data about all items in the folder.
* Folders and Files are stored in separate lists (doesn't matter to us,
* since we distinguish them based on mime type anyway).
*/
for (const data_sub of data[1]) {
if (!Array.isArray(data_sub) || !/^driveweb/.test(data_sub[0]) ||
!Array.isArray(data_sub[1]))
continue;
for (const item of data_sub[1])
process_file_data(item, add_content_item);
}
}
/*
* Folder items data actually exists in both of the 2 kinds of scripts we search
* for. In case of both of the regexes below we call `process_file_data' in the
* end. As a result we process the same file multiple time as it appears in 2
* scripts. This is, however, a good thing, because it makes a change less
* likely to break our fix.
*/
const ivd_data_regex = /\s*window\s*\['_DRIVE_ivd'\]\s*=\s*'(\\x5b[^']+)'(.*)$/;
const af_init_data_regex = /AF_initDataCallback\s*\(.+data\s*:\s*(\[.*\])[^\]]+$/;
for (const script of document.scripts) {
const ivd_data_match = ivd_data_regex.exec(script.textContent);
if (ivd_data_match) {
const ivd_data = try_parse(ivd_data_match[1], true);
if (ivd_data && Array.isArray(ivd_data) && Array.isArray(ivd_data[0])) {
for (const item of ivd_data[0])
process_file_data(item, add_content_item);
}
}
const af_init_data_match = af_init_data_regex.exec(script.textContent);
if (af_init_data_match) {
const af_init_data = try_parse(af_init_data_match[1], false);
if (af_init_data)
process_af_init_data(af_init_data);
}
}
/* Construct our own user interface. */
const body = document.createElement("body");
const folders = document.createElement("div");
const files = document.createElement("div");
const folders_heading = document.createElement("h2");
const files_heading = document.createElement("h2");
folders_heading.textContent = "Folders";
files_heading.textContent = "Files";
let has_folders = false;
let has_files = false;
folders.appendChild(folders_heading);
files.appendChild(files_heading);
body.setAttribute("style", "width: 100vw; height: 100vh; overflow: scroll; color: #555; margin: 15px; -webkit-user-select: initial;");
const drive_folder_regex = /application\/vnd.google-apps.(folder|shortcut)/;
function add_item_to_view(item_data)
{
const item_div = document.createElement("div");
const item_heading = document.createElement("h4");
item_div.setAttribute("style", "border: 2px solid #999; border-radius: 8px; padding: 10px; display: inline-block; margin: 2px;");
let item_heading_style = "margin: 8px 4px;";
if (item_data.filename) {
item_heading.textContent = item_data.filename;
} else {
item_heading.textContent = "(no name)";
item_heading_style += " font-style:italic;";
}
item_heading.setAttribute("style", item_heading_style);
item_div.appendChild(item_heading);
const mime_info = get_mime_info(item_data.mime);
if (mime_info.type) {
const type_div = document.createElement("div");
type_div.setAttribute("style", "margin-bottom: 5px;");
type_div.textContent = mime_info.type;
item_div.appendChild(type_div);
}
if (mime_info.is_folder)
has_folders = true;
else
has_files = true;
const links = {};
if (item_data.id)
Object.assign(links, mime_info.links(item_data.id));
if (links.view) {
const view_button = document.createElement("a");
view_button.setAttribute("style", "border-radius: 5px; padding: 10px; color: #333; background-color: lightgreen; text-decoration: none; box-shadow: -4px 8px 8px #888; display: inline-block; margin: 5px;");
view_button.textContent = "view";
view_button.href = links.view;
item_div.appendChild(view_button);
}
if (links.download) {
const download_button = document.createElement("a");
download_button.setAttribute("style", "border-radius: 5px; padding: 10px; color: #333; background-color: lightgreen; text-decoration: none; box-shadow: -4px 8px 8px #888; display: inline-block; margin: 5px;");
download_button.textContent = "download";
download_button.href = links.download;
download_button.type = mime_info.new_mime;
item_div.appendChild(download_button);
}
(mime_info.is_folder ? folders : files).appendChild(item_div);
}
for (const item of content.values())
add_item_to_view(item);
if (this_folder.filename) {
const heading = document.createElement("h1");
heading.textContent = this_folder.filename;
body.appendChild(heading);
}
if (this_folder.folders && this_folder.folders.length > 0) {
for (const parent_id of this_folder.folders) {
const up_button = document.createElement("a");
let text = "go up";
up_button.setAttribute("style", "border-radius: 5px; padding: 10px; color: #333; background-color: lightgreen; text-decoration: none; box-shadow: -4px 8px 8px #888; display: inline-block; margin: 5px;");
up_button.href = `https://drive.google.com/drive/folders/${parent_id}`;
if (this_folder.folders.length > 1)
text = `${text} (${parent_id})`;
up_button.textContent = text;
body.appendChild(up_button);
}
}
if (has_folders)
body.appendChild(folders);
if (has_files)
body.appendChild(files);
if (!(has_files || has_folders)) {
const no_files_message = document.createElement("h3");
no_files_message.textContent = "No files found.";
body.appendChild(no_files_message);
}
if (document.body.firstChild.id !== "af-error-container")
document.documentElement.replaceChild(body, document.body);
