feat(WEB-132): add middlewares, support for seamless login and improve lang based routes

utils/aes.ts

@@ -0,0 +1,41 @@
+function base64ToUint8Array(base64String: string) {
+  const binaryString = atob(base64String)
+  const byteArray = new Uint8Array(binaryString.length)
+  for (let i = 0; i < binaryString.length; i++) {
+    byteArray[i] = binaryString.charCodeAt(i)
+  }
+  return byteArray
+}
+
+function utf8ToUint8Array(utf8String: string) {
+  return new TextEncoder().encode(utf8String)
+}
+
+function uint8ArrayToUtf8(uint8Array: Uint8Array) {
+  return new TextDecoder().decode(uint8Array)
+}
+
+export async function decryptData(
+  keyBase64: string,
+  ivBase64: string,
+  encryptedDataBase64: string
+): Promise<string> {
+  const keyBuffer = await crypto.subtle.importKey(
+    "raw",
+    base64ToUint8Array(keyBase64),
+    "AES-CBC",
+    false,
+    ["decrypt"]
+  )
+
+  const encryptedDataBuffer = base64ToUint8Array(encryptedDataBase64)
+  const ivBuffer = base64ToUint8Array(ivBase64)
+  const decryptedDataBuffer = await crypto.subtle.decrypt(
+    { name: "AES-CBC", iv: ivBuffer },
+    keyBuffer,
+    encryptedDataBuffer
+  )
+
+  const decryptedData = uint8ArrayToUtf8(new Uint8Array(decryptedDataBuffer))
+  return decryptedData
+}