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/**
* Copyright 2021 Wojtek Kosior
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of either:
* - 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, or
* - the "A" license: <https://koszko.org/alicense.txt>; explained
* at: <https://koszko.org/en/articles/my-new-license.html>
*
* 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. If you delete this
* exception statement from all source files in the program, then
* also delete it here.
*
* 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.
*/
/* 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);
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