fix: handle uploads of filenames that require uri encoding

tests/01_static_files.test.ts

@@ -275,6 +275,98 @@ Deno.test({
 	}
 });
 
+Deno.test({
+	name: 'ensure filenames with HTML escapes work',
+	permissions: {
+		env: true,
+		read: true,
+		write: true,
+		net: true
+	},
+
+	sanitizeResources: false,
+	sanitizeOps: false,
+
+	fn: async () => {
+		let test_server_info: EPHEMERAL_SERVER | null = null;
+		const cwd = Deno.cwd();
+
+		const PREVIOUS_PUT_PATHS_ALLOWED = Deno.env.get('SERVERUS_PUT_PATHS_ALLOWED');
+		try {
+			Deno.chdir('./tests/www');
+			Deno.env.set('SERVERUS_PUT_PATHS_ALLOWED', path.join(Deno.cwd(), 'files'));
+
+			test_server_info = await get_ephemeral_listen_server();
+
+			const put_body = new FormData();
+			let test_file: File | undefined = new File(['this is a test upload with strange filename'], encodeURIComponent('2Q==(30).txt'));
+			put_body.append('file', test_file);
+
+			// Sending a single file
+			const put_response = await fetch(`http://${test_server_info.hostname}:${test_server_info.port}/files/2Q==(30).txt`, {
+				method: 'PUT',
+				body: put_body
+			});
+
+			asserts.assert(put_response.ok);
+
+			const put_response_body = await put_response.json();
+			asserts.assert(put_response_body);
+			asserts.assert(put_response_body.written);
+			asserts.assertEquals(
+				put_response_body.written?.[0],
+				`http://${test_server_info.hostname}:${test_server_info.port}/files/2Q==(30).txt`
+			);
+
+			put_body.delete('file');
+			test_file = undefined;
+
+			const get_response = await fetch(`http://${test_server_info.hostname}:${test_server_info.port}/files/2Q==(30).txt`, {
+				method: 'GET'
+			});
+
+			asserts.assert(get_response.ok);
+			asserts.assert(get_response.body);
+
+			const local_download_path = path.join(Deno.cwd(), 'files', '2Q==(30).txt-downloaded');
+			await ensureFile(local_download_path);
+
+			const file = await Deno.open(local_download_path, { truncate: true, write: true });
+			await get_response.body.pipeTo(file.writable);
+
+			const download_content = await Deno.readTextFile(local_download_path);
+			asserts.assert(download_content);
+			asserts.assertEquals(download_content, 'this is a test upload with strange filename');
+
+			await Deno.remove(local_download_path);
+			asserts.assert(!fs.existsSync(local_download_path));
+
+			const local_upload_path = path.join(Deno.cwd(), 'files', '2Q==(30).txt');
+			asserts.assert(fs.existsSync(local_upload_path));
+
+			const stat = await Deno.lstat(local_upload_path);
+			asserts.assert(stat);
+			asserts.assert(stat.isFile);
+			asserts.assertEquals(stat.size, 43);
+			asserts.assertEquals(stat.mode! & 0o777, 0o755);
+
+			await Deno.remove(local_upload_path);
+			asserts.assert(!fs.existsSync(local_upload_path));
+		} finally {
+			Deno.chdir(cwd);
+			if (PREVIOUS_PUT_PATHS_ALLOWED) {
+				Deno.env.set('SERVERUS_PUT_PATHS_ALLOWED', PREVIOUS_PUT_PATHS_ALLOWED);
+			} else {
+				Deno.env.delete('SERVERUS_PUT_PATHS_ALLOWED');
+			}
+
+			if (test_server_info) {
+				await test_server_info?.server?.stop();
+			}
+		}
+	}
+});
+
 Deno.test({
 	name: 'allow PUT to multiple files in a directory',
 	permissions: {