Move download command to extension host

src/vs/workbench/api/node/extHostDownloadService.ts

@@ -0,0 +1,28 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { join } from 'vs/base/common/path';
+import { tmpdir } from 'os';
+import { generateUuid } from 'vs/base/common/uuid';
+import { ExtHostCommands } from 'vs/workbench/api/common/extHostCommands';
+import { Disposable } from 'vs/base/common/lifecycle';
+import { MainThreadDownloadServiceShape } from 'vs/workbench/api/common/extHost.protocol';
+import { URI } from 'vs/base/common/uri';
+
+export class ExtHostDownloadService extends Disposable {
+
+	constructor(
+		proxy: MainThreadDownloadServiceShape,
+		commands: ExtHostCommands
+	) {
+		super();
+		commands.registerCommand(false, '_workbench.downloadResource', async (resource: URI): Promise<any> => {
+			const location = URI.file(join(tmpdir(), generateUuid()));
+			await proxy.$download(resource, location);
+			return location;
+		});
+	}
+
+}