2 files changed, 163 insertions, 0 deletions
diff --git a/content/sgoogle_drive_download/google_drive_download_file.js b/content/sgoogle_drive_download/google_drive_download_file.js
new file mode 100644
index 0000000..248a186
--- /dev/null
+++ b/content/sgoogle_drive_download/google_drive_download_file.js
@@ -0,0 +1,157 @@
+/**
+ * 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);
diff --git a/content/sgoogle_drive_download/index.json b/content/sgoogle_drive_download/index.json
new file mode 100644
index 0000000..1d19ebd
--- /dev/null
+++ b/content/sgoogle_drive_download/index.json
@@ -0,0 +1,6 @@
+{
+"type" : "script",
+"name" : "google_drive_download",
+"sha256" : "495ca0ed698136795b57da8643625e120856e4b56061bbdcb45d192a4bd280f6",
+"location" : "google_drive_download_file.js"
+}