1 files changed, 39 insertions, 0 deletions
diff --git a/cli/js/permissions.ts b/cli/js/permissions.ts
new file mode 100644
index 000000000..4f393501c
--- /dev/null
+++ b/cli/js/permissions.ts
@@ -0,0 +1,39 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import * as dispatch from "./dispatch.ts";
+import { sendSync } from "./dispatch_json.ts";
+
+/** Permissions as granted by the caller */
+export interface Permissions {
+  read: boolean;
+  write: boolean;
+  net: boolean;
+  env: boolean;
+  run: boolean;
+  hrtime: boolean;
+  // NOTE: Keep in sync with src/permissions.rs
+}
+
+export type Permission = keyof Permissions;
+
+/** Inspect granted permissions for the current program.
+ *
+ *       if (Deno.permissions().read) {
+ *         const file = await Deno.readFile("example.test");
+ *         // ...
+ *       }
+ */
+export function permissions(): Permissions {
+  return sendSync(dispatch.OP_PERMISSIONS) as Permissions;
+}
+
+/** Revoke a permission. When the permission was already revoked nothing changes
+ *
+ *       if (Deno.permissions().read) {
+ *         const file = await Deno.readFile("example.test");
+ *         Deno.revokePermission('read');
+ *       }
+ *       Deno.readFile("example.test"); // -> error or permission prompt
+ */
+export function revokePermission(permission: Permission): void {
+  sendSync(dispatch.OP_REVOKE_PERMISSION, { permission });
+}