From 817c41586d88e5731ca3d2575c65e3eca95b3e06 Mon Sep 17 00:00:00 2001
From: Matthew Miller <matthew@millerti.me>
Date: Sun, 5 Jul 2020 17:13:08 -0700
Subject: Add new isBase64URLString helper

---
 packages/server/src/helpers/isBase64URLString.ts | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 packages/server/src/helpers/isBase64URLString.ts

(limited to 'packages/server/src')

diff --git a/packages/server/src/helpers/isBase64URLString.ts b/packages/server/src/helpers/isBase64URLString.ts
new file mode 100644
index 0000000..09a6404
--- /dev/null
+++ b/packages/server/src/helpers/isBase64URLString.ts
@@ -0,0 +1,13 @@
+// Base64URL, with optional padding
+const base64urlRegEx = /^([0-9a-zA-Z-_]{4})*(([0-9a-zA-Z-_]{2}(==)?)|([0-9a-zA-Z-_]{3}=?))?$/;
+
+/**
+ * Check to see if a string only contains valid Base64URL values
+ */
+export default function isBase64URLString(value: string): boolean {
+  if (!value) {
+    return false;
+  }
+
+  return base64urlRegEx.test(value);
+}
-- 
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