feat: backend changes for dynamic secret

backend/src/ee/services/dynamic-secret/providers/aws-elasticache.ts

@@ -132,9 +132,15 @@ const generatePassword = () => {
   return customAlphabet(charset, 64)();
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
   const charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-";
-  return `inf-${customAlphabet(charset, 32)()}`; // Username must start with an ascii letter, so we prepend the username with "inf-"
+  const randomUsername = `inf-${customAlphabet(charset, 32)()}`; // Username must start with an ascii letter, so we prepend the username with "inf-"
+  if (!usernameTemplate) return randomUsername;
+
+  return handlebars.compile(usernameTemplate)({
+    randomUsername,
+    unixTimestamp: Math.floor(Date.now() / 100)
+  });
 };
 
 export const AwsElastiCacheDatabaseProvider = (): TDynamicProviderFns => {
@@ -168,13 +174,14 @@ export const AwsElastiCacheDatabaseProvider = (): TDynamicProviderFns => {
     return true;
   };
 
-  const create = async (inputs: unknown, expireAt: number) => {
+  const create = async (data: { inputs: unknown; expireAt: number; usernameTemplate?: string | null }) => {
+    const { inputs, expireAt, usernameTemplate } = data;
     const providerInputs = await validateProviderInputs(inputs);
     if (!(await validateConnection(providerInputs))) {
       throw new BadRequestError({ message: "Failed to establish connection" });
     }
 
-    const leaseUsername = generateUsername();
+    const leaseUsername = generateUsername(usernameTemplate);
     const leasePassword = generatePassword();
     const leaseExpiration = new Date(expireAt).toISOString();