feat: add chmod Node polyfill and related file system constants (#4358)

1 files changed, 52 insertions, 0 deletions

diff --git a/std/node/_fs/_fs_chmod.ts b/std/node/_fs/_fs_chmod.ts
new file mode 100644
index 000000000..cecb878ec
--- /dev/null
+++ b/std/node/_fs/_fs_chmod.ts
@@ -0,0 +1,52 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+import { CallbackWithError } from "./_fs_common.ts";
+
+const allowedModes = /^[0-7]{3}/;
+
+/**
+ * TODO: Also accept 'path' parameter as a Node polyfill Buffer or URL type once these
+ * are implemented. See https://github.com/denoland/deno/issues/3403
+ */
+export function chmod(
+  path: string,
+  mode: string | number,
+  callback: CallbackWithError
+): void {
+  new Promise(async (resolve, reject) => {
+    try {
+      await Deno.chmod(path, getResolvedMode(mode));
+      resolve();
+    } catch (err) {
+      reject(err);
+    }
+  })
+    .then(() => {
+      callback();
+    })
+    .catch(err => {
+      callback(err);
+    });
+}
+
+/**
+ * TODO: Also accept 'path' parameter as a Node polyfill Buffer or URL type once these
+ * are implemented. See https://github.com/denoland/deno/issues/3403
+ */
+export function chmodSync(path: string, mode: string | number): void {
+  Deno.chmodSync(path, getResolvedMode(mode));
+}
+
+function getResolvedMode(mode: string | number): number {
+  if (typeof mode === "number") {
+    return mode;
+  }
+
+  if (typeof mode === "string") {
+    if (!allowedModes.test(mode)) {
+      throw new Error("Unrecognized mode: " + mode);
+    }
+  }
+
+  return parseInt(mode, 8);
+}