Add controllers and packages for security keys

resources/scripts/lib/base64.ts

@@ -0,0 +1,16 @@
+function decodeBase64 (input: string): string {
+    input = input.replace(/-/g, '+').replace(/_/g, '/');
+
+    const pad = input.length % 4;
+    if (pad) {
+        if (pad === 1) {
+            throw new Error('InvalidLengthError: Input base64url string is the wrong length to determine padding');
+        }
+
+        input += new Array(5 - pad).join('=');
+    }
+
+    return input;
+}
+
+export { decodeBase64 }