implement zipping multiple files for download

navigator/navigator.js

@@ -841,8 +841,41 @@ class NavContextMenu {
 		this.nav_window_ref.refresh();
 	}
 
-	download() {
-		var download = new NavDownloader(this.target);
+	zip_for_download() {
+		return new Promise((resolve, reject) => {
+			var cmd = [
+				"/usr/share/cockpit/navigator/scripts/zip-for-download.py",
+				this.nav_window_ref.pwd().path_str()
+			];
+			for (let entry of this.nav_window_ref.selected_entries) {
+				cmd.push(entry.path_str());
+			}
+			var proc = cockpit.spawn(cmd, {superuser: "try", err: "out"});
+			proc.fail((e, data) => {
+				reject(JSON.parse(data));
+			});
+			proc.done((data) => {
+				resolve(JSON.parse(data));
+			});
+		});
+	}
+
+	async download() {
+		var download_target = "";
+		if (this.nav_window_ref.selected_entries.size === 1 && !this.target instanceof NavDir) {
+			download_target = this.target;
+		} else {
+			this.nav_window_ref.start_load();
+			var result;
+			try {
+				result = await this.zip_for_download();
+			} catch(e) {
+				window.alert(e.message);
+			}
+			this.nav_window_ref.stop_load();
+			download_target = new NavFile(result["archive-path"], result["stat"], this.nav_window_ref);
+		}
+		var download = new NavDownloader(download_target);
 		download.download();
 	}
 
@@ -866,6 +899,7 @@ class NavContextMenu {
 		} else {
 			this.nav_window_ref.set_selected(target, false, false);
 		}
+		this.menu_options["download"].style.display = "flex";
 		if (target === this.nav_window_ref.pwd()) {
 			this.menu_options["copy"].style.display = "none";
 			this.menu_options["cut"].style.display = "none";
@@ -877,12 +911,9 @@ class NavContextMenu {
 		}
 		if (this.nav_window_ref.selected_entries.size > 1) {
 			this.menu_options["rename"].style.display = "none";
-			this.menu_options["download"].style.display = "none";
 		} else {
 			this.menu_options["rename"].style.display = "flex";
-			if (target instanceof NavFile)
-				this.menu_options["download"].style.display = "flex";
-			else
+			if (target instanceof NavFileLink)
 				this.menu_options["download"].style.display = "none";
 		}
 		this.target = target;

navigator/scripts/zip-for-download.py

@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+
+"""
+    Cockpit Navigator - A File System Browser for Cockpit.
+    Copyright (C) 2021 Josh Boudreau <jboudreau@45drives.com>
+
+    This file is part of Cockpit Navigator.
+    Cockpit Navigator 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.
+    Cockpit Navigator 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.
+    You should have received a copy of the GNU General Public License
+    along with Cockpit Navigator.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+"""
+Synopsis: `zip-for-download.py </path/to/cwd> </path/to/file> [</path/to/file> ...]`
+Output is JSON object with form:
+{
+    message: <error message if applicable>,
+    archive-path: </path/to/archive>,
+    stat: {
+        size: <size of archive in bytes> // for setting channel max read size
+    }
+}
+"""
+
+import os
+import sys
+import json
+import subprocess
+from datetime import datetime
+
+def get_relpaths(full_paths, cwd):
+    response = []
+    for path in full_paths:
+        response.append(os.path.relpath(path, cwd))
+    return response
+
+def make_zip(path):
+    try:
+        cwd = sys.argv[1]
+        files = get_relpaths(sys.argv[2:], cwd)
+        os.chdir(cwd)
+    except Exception as e:
+        print(json.dumps({
+            "message": e
+        }))
+        sys.exit(1)
+    cmd = ["zip", "-r", "--symlinks", path, *files]
+    try:
+        child = subprocess.Popen(
+            cmd,
+            stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True
+        )
+    except Exception as e:
+        print(json.dumps({
+            "message": e
+        }))
+        sys.exit(1)
+    child.wait()
+    if child.returncode:
+        stdout, stderr = child.communicate()
+        print(json.dumps({
+            "message": stdout + stderr
+        }))
+        sys.exit(child.returncode)
+    try:
+        archive_size = os.stat(path).st_size
+    except Exception as e:
+        print(json.dumps({
+            "message": e
+        }))
+        sys.exit(1)
+    print(json.dumps({
+        "message": "",
+        "archive-path": path,
+        "stat": {
+            "size": archive_size
+        }
+    }))
+
+def main():
+    tmp_dir = "/tmp/navigator"
+    if not os.path.exists(tmp_dir):
+        os.mkdir(tmp_dir)
+    elif not os.path.isdir(tmp_dir):
+        print(json.dumps({
+            "message": "Temp path already exists."
+        }))
+        sys.exit(1)
+    archive_path = tmp_dir + "/navigator-download_" + datetime.now().strftime("%Y-%m-%d_%H-%M-%S.%f") + ".zip"
+    make_zip(archive_path)
+
+
+if __name__ == "__main__":
+    main()