feat: backend changes for dynamic secret

backend/src/db/migrations/20250527140639_dynamic-secret-username-template.ts

@@ -0,0 +1,21 @@
+import { Knex } from "knex";
+
+import { TableName } from "../schemas";
+
+export async function up(knex: Knex): Promise<void> {
+  const hasColumn = await knex.schema.hasColumn(TableName.DynamicSecret, "usernameTemplate");
+  if (!hasColumn) {
+    await knex.schema.alterTable(TableName.DynamicSecret, (t) => {
+      t.string("usernameTemplate").nullable();
+    });
+  }
+}
+
+export async function down(knex: Knex): Promise<void> {
+  const hasColumn = await knex.schema.hasColumn(TableName.DynamicSecret, "usernameTemplate");
+  if (hasColumn) {
+    await knex.schema.alterTable(TableName.DynamicSecret, (t) => {
+      t.dropColumn("usernameTemplate");
+    });
+  }
+}

backend/src/db/schemas/dynamic-secrets.ts

@@ -28,7 +28,8 @@ export const DynamicSecretsSchema = z.object({
   updatedAt: z.date(),
   encryptedInput: zodBuffer,
   projectGatewayId: z.string().uuid().nullable().optional(),
-  gatewayId: z.string().uuid().nullable().optional()
+  gatewayId: z.string().uuid().nullable().optional(),
+  usernameTemplate: z.string().nullable().optional()
 });
 
 export type TDynamicSecrets = z.infer<typeof DynamicSecretsSchema>;

backend/src/ee/routes/v1/dynamic-secret-router.ts

@@ -6,6 +6,7 @@ import { ApiDocsTags, DYNAMIC_SECRETS } from "@app/lib/api-docs";
 import { daysToMillisecond } from "@app/lib/dates";
 import { removeTrailingSlash } from "@app/lib/fn";
 import { ms } from "@app/lib/ms";
+import { isValidHandleBarTemplate } from "@app/lib/template/validate-handlebars";
 import { readLimit, writeLimit } from "@app/server/config/rateLimiter";
 import { slugSchema } from "@app/server/lib/schemas";
 import { verifyAuth } from "@app/server/plugins/auth/verify-auth";
@@ -13,6 +14,15 @@ import { SanitizedDynamicSecretSchema } from "@app/server/routes/sanitizedSchema
 import { AuthMode } from "@app/services/auth/auth-type";
 import { ResourceMetadataSchema } from "@app/services/resource-metadata/resource-metadata-schema";
 
+const userTemplateSchema = z
+  .string()
+  .trim()
+  .refine((el) =>
+    isValidHandleBarTemplate(el, {
+      allowedExpressions: (val) => ["randomUsername", "unixTimestamp"].includes(val)
+    })
+  );
+
 export const registerDynamicSecretRouter = async (server: FastifyZodProvider) => {
   server.route({
     method: "POST",
@@ -52,7 +62,8 @@ export const registerDynamicSecretRouter = async (server: FastifyZodProvider) =>
         path: z.string().describe(DYNAMIC_SECRETS.CREATE.path).trim().default("/").transform(removeTrailingSlash),
         environmentSlug: z.string().describe(DYNAMIC_SECRETS.CREATE.environmentSlug).min(1),
         name: slugSchema({ min: 1, max: 64, field: "Name" }).describe(DYNAMIC_SECRETS.CREATE.name),
-        metadata: ResourceMetadataSchema.optional()
+        metadata: ResourceMetadataSchema.optional(),
+        usernameTemplate: userTemplateSchema.optional()
       }),
       response: {
         200: z.object({
@@ -73,39 +84,6 @@ export const registerDynamicSecretRouter = async (server: FastifyZodProvider) =>
     }
   });
 
-  server.route({
-    method: "POST",
-    url: "/entra-id/users",
-    config: {
-      rateLimit: readLimit
-    },
-    schema: {
-      body: z.object({
-        tenantId: z.string().min(1).describe("The tenant ID of the Azure Entra ID"),
-        applicationId: z.string().min(1).describe("The application ID of the Azure Entra ID App Registration"),
-        clientSecret: z.string().min(1).describe("The client secret of the Azure Entra ID App Registration")
-      }),
-      response: {
-        200: z
-          .object({
-            name: z.string().min(1).describe("The name of the user"),
-            id: z.string().min(1).describe("The ID of the user"),
-            email: z.string().min(1).describe("The email of the user")
-          })
-          .array()
-      }
-    },
-    onRequest: verifyAuth([AuthMode.JWT, AuthMode.IDENTITY_ACCESS_TOKEN]),
-    handler: async (req) => {
-      const data = await server.services.dynamicSecret.fetchAzureEntraIdUsers({
-        tenantId: req.body.tenantId,
-        applicationId: req.body.applicationId,
-        clientSecret: req.body.clientSecret
-      });
-      return data;
-    }
-  });
-
   server.route({
     method: "PATCH",
     url: "/:name",
@@ -150,7 +128,8 @@ export const registerDynamicSecretRouter = async (server: FastifyZodProvider) =>
             })
             .nullable(),
           newName: z.string().describe(DYNAMIC_SECRETS.UPDATE.newName).optional(),
-          metadata: ResourceMetadataSchema.optional()
+          metadata: ResourceMetadataSchema.optional(),
+          usernameTemplate: userTemplateSchema.nullable().optional()
         })
       }),
       response: {
@@ -328,4 +307,37 @@ export const registerDynamicSecretRouter = async (server: FastifyZodProvider) =>
       return { leases };
     }
   });
+
+  server.route({
+    method: "POST",
+    url: "/entra-id/users",
+    config: {
+      rateLimit: readLimit
+    },
+    schema: {
+      body: z.object({
+        tenantId: z.string().min(1).describe("The tenant ID of the Azure Entra ID"),
+        applicationId: z.string().min(1).describe("The application ID of the Azure Entra ID App Registration"),
+        clientSecret: z.string().min(1).describe("The client secret of the Azure Entra ID App Registration")
+      }),
+      response: {
+        200: z
+          .object({
+            name: z.string().min(1).describe("The name of the user"),
+            id: z.string().min(1).describe("The ID of the user"),
+            email: z.string().min(1).describe("The email of the user")
+          })
+          .array()
+      }
+    },
+    onRequest: verifyAuth([AuthMode.JWT, AuthMode.IDENTITY_ACCESS_TOKEN]),
+    handler: async (req) => {
+      const data = await server.services.dynamicSecret.fetchAzureEntraIdUsers({
+        tenantId: req.body.tenantId,
+        applicationId: req.body.applicationId,
+        clientSecret: req.body.clientSecret
+      });
+      return data;
+    }
+  });
 };

backend/src/ee/services/dynamic-secret-lease/dynamic-secret-lease-service.ts

@@ -132,7 +132,11 @@ export const dynamicSecretLeaseServiceFactory = ({
 
     let result;
     try {
-      result = await selectedProvider.create(decryptedStoredInput, expireAt.getTime());
+      result = await selectedProvider.create({
+        inputs: decryptedStoredInput,
+        expireAt: expireAt.getTime(),
+        usernameTemplate: dynamicSecretCfg.usernameTemplate
+      });
     } catch (error: unknown) {
       if (error && typeof error === "object" && error !== null && "sqlMessage" in error) {
         throw new BadRequestError({ message: error.sqlMessage as string });

backend/src/ee/services/dynamic-secret/dynamic-secret-service.ts

@@ -78,7 +78,8 @@ export const dynamicSecretServiceFactory = ({
     actorOrgId,
     defaultTTL,
     actorAuthMethod,
-    metadata
+    metadata,
+    usernameTemplate
   }: TCreateDynamicSecretDTO) => {
     const project = await projectDAL.findProjectBySlug(projectSlug, actorOrgId);
     if (!project) throw new NotFoundError({ message: `Project with slug '${projectSlug}' not found` });
@@ -163,7 +164,8 @@ export const dynamicSecretServiceFactory = ({
           defaultTTL,
           folderId: folder.id,
           name,
-          gatewayId: selectedGatewayId
+          gatewayId: selectedGatewayId,
+          usernameTemplate
         },
         tx
       );
@@ -199,7 +201,8 @@ export const dynamicSecretServiceFactory = ({
     newName,
     actorOrgId,
     actorAuthMethod,
-    metadata
+    metadata,
+    usernameTemplate
   }: TUpdateDynamicSecretDTO) => {
     const project = await projectDAL.findProjectBySlug(projectSlug, actorOrgId);
     if (!project) throw new NotFoundError({ message: `Project with slug '${projectSlug}' not found` });
@@ -311,7 +314,8 @@ export const dynamicSecretServiceFactory = ({
           defaultTTL,
           name: newName ?? name,
           status: null,
-          gatewayId: selectedGatewayId
+          gatewayId: selectedGatewayId,
+          usernameTemplate
         },
         tx
       );

backend/src/ee/services/dynamic-secret/dynamic-secret-types.ts

@@ -22,6 +22,7 @@ export type TCreateDynamicSecretDTO = {
   name: string;
   projectSlug: string;
   metadata?: ResourceMetadataDTO;
+  usernameTemplate?: string | null;
 } & Omit<TProjectPermission, "projectId">;
 
 export type TUpdateDynamicSecretDTO = {
@@ -34,6 +35,7 @@ export type TUpdateDynamicSecretDTO = {
   inputs?: TProvider["inputs"];
   projectSlug: string;
   metadata?: ResourceMetadataDTO;
+  usernameTemplate?: string | null;
 } & Omit<TProjectPermission, "projectId">;
 
 export type TDeleteDynamicSecretDTO = {

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();
 

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

@@ -16,6 +16,7 @@ import {
   PutUserPolicyCommand,
   RemoveUserFromGroupCommand
 } from "@aws-sdk/client-iam";
+import handlebars from "handlebars";
 import { z } from "zod";
 
 import { BadRequestError } from "@app/lib/errors";
@@ -23,8 +24,14 @@ import { alphaNumericNanoId } from "@app/lib/nanoid";
 
 import { DynamicSecretAwsIamSchema, TDynamicProviderFns } from "./models";
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(32);
+  const randomUsername = alphaNumericNanoId(32);
+  if (!usernameTemplate) return randomUsername;
+
+  return handlebars.compile(usernameTemplate)({
+    randomUsername,
+    unixTimestamp: Math.floor(Date.now() / 100)
+  });
 };
 
 export const AwsIamProvider = (): TDynamicProviderFns => {
@@ -53,11 +60,13 @@ export const AwsIamProvider = (): TDynamicProviderFns => {
     return isConnected;
   };
 
-  const create = async (inputs: unknown) => {
+  const create = async (data: { inputs: unknown; expireAt: number; usernameTemplate?: string | null }) => {
+    const { inputs, usernameTemplate } = data;
+
     const providerInputs = await validateProviderInputs(inputs);
     const client = await $getClient(providerInputs);
 
-    const username = generateUsername();
+    const username = generateUsername(usernameTemplate);
     const { policyArns, userGroups, policyDocument, awsPath, permissionBoundaryPolicyArn } = providerInputs;
     const createUserRes = await client.send(
       new CreateUserCommand({

backend/src/ee/services/dynamic-secret/providers/azure-entra-id.ts

@@ -55,7 +55,7 @@ export const AzureEntraIDProvider = (): TDynamicProviderFns & {
     return data.success;
   };
 
-  const create = async (inputs: unknown) => {
+  const create = async ({ inputs }: { inputs: unknown }) => {
     const providerInputs = await validateProviderInputs(inputs);
     const data = await $getToken(providerInputs.tenantId, providerInputs.applicationId, providerInputs.clientSecret);
     if (!data.success) {
@@ -88,7 +88,7 @@ export const AzureEntraIDProvider = (): TDynamicProviderFns & {
 
   const revoke = async (inputs: unknown, entityId: string) => {
     // Creates a new password
-    await create(inputs);
+    await create({ inputs });
     return { entityId };
   };
 

backend/src/ee/services/dynamic-secret/providers/cassandra.ts

@@ -14,8 +14,14 @@ const generatePassword = (size = 48) => {
   return customAlphabet(charset, 48)(size);
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(32);
+  const randomUsername = alphaNumericNanoId(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 CassandraProvider = (): TDynamicProviderFns => {
@@ -69,11 +75,12 @@ export const CassandraProvider = (): TDynamicProviderFns => {
     return isConnected;
   };
 
-  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);
     const client = await $getClient(providerInputs);
 
-    const username = generateUsername();
+    const username = generateUsername(usernameTemplate);
     const password = generatePassword();
     const { keyspace } = providerInputs;
     const expiration = new Date(expireAt).toISOString();

backend/src/ee/services/dynamic-secret/providers/elastic-search.ts

@@ -1,4 +1,5 @@
 import { Client as ElasticSearchClient } from "@elastic/elasticsearch";
+import handlebars from "handlebars";
 import { customAlphabet } from "nanoid";
 import { z } from "zod";
 
@@ -12,8 +13,14 @@ const generatePassword = () => {
   return customAlphabet(charset, 64)();
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(32);
+  const randomUsername = alphaNumericNanoId(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 ElasticSearchProvider = (): TDynamicProviderFns => {
@@ -64,11 +71,12 @@ export const ElasticSearchProvider = (): TDynamicProviderFns => {
     return infoResponse;
   };
 
-  const create = async (inputs: unknown) => {
+  const create = async (data: { inputs: unknown; usernameTemplate?: string | null }) => {
+    const { inputs, usernameTemplate } = data;
     const providerInputs = await validateProviderInputs(inputs);
     const connection = await $getClient(providerInputs);
 
-    const username = generateUsername();
+    const username = generateUsername(usernameTemplate);
     const password = generatePassword();
 
     await connection.security.putUser({

backend/src/ee/services/dynamic-secret/providers/ldap.ts

@@ -22,8 +22,14 @@ const encodePassword = (password?: string) => {
   return base64Password;
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(20);
+  const randomUsername = alphaNumericNanoId(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)
+  });
 };
 
 const generateLDIF = ({
@@ -190,7 +196,8 @@ export const LdapProvider = (): TDynamicProviderFns => {
     return dnArray;
   };
 
-  const create = async (inputs: unknown) => {
+  const create = async (data: { inputs: unknown; usernameTemplate?: string | null }) => {
+    const { inputs, usernameTemplate } = data;
     const providerInputs = await validateProviderInputs(inputs);
     const client = await $getClient(providerInputs);
 
@@ -217,7 +224,7 @@ export const LdapProvider = (): TDynamicProviderFns => {
         });
       }
     } else {
-      const username = generateUsername();
+      const username = generateUsername(usernameTemplate);
       const password = generatePassword();
       const generatedLdif = generateLDIF({ username, password, ldifTemplate: providerInputs.creationLdif });
 

backend/src/ee/services/dynamic-secret/providers/models.ts

@@ -342,7 +342,11 @@ export const DynamicSecretProviderSchema = z.discriminatedUnion("type", [
 ]);
 
 export type TDynamicProviderFns = {
-  create: (inputs: unknown, expireAt: number) => Promise<{ entityId: string; data: unknown }>;
+  create: (arg: {
+    inputs: unknown;
+    expireAt: number;
+    usernameTemplate?: string | null;
+  }) => Promise<{ entityId: string; data: unknown }>;
   validateConnection: (inputs: unknown) => Promise<boolean>;
   validateProviderInputs: (inputs: object) => Promise<unknown>;
   revoke: (inputs: unknown, entityId: string) => Promise<{ entityId: string }>;

backend/src/ee/services/dynamic-secret/providers/mongo-atlas.ts

@@ -1,4 +1,5 @@
 import axios, { AxiosError } from "axios";
+import handlebars from "handlebars";
 import { customAlphabet } from "nanoid";
 import { z } from "zod";
 
@@ -12,8 +13,14 @@ const generatePassword = (size = 48) => {
   return customAlphabet(charset, 48)(size);
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(32);
+  const randomUsername = alphaNumericNanoId(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 MongoAtlasProvider = (): TDynamicProviderFns => {
@@ -57,11 +64,12 @@ export const MongoAtlasProvider = (): TDynamicProviderFns => {
     return isConnected;
   };
 
-  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);
     const client = await $getClient(providerInputs);
 
-    const username = generateUsername();
+    const username = generateUsername(usernameTemplate);
     const password = generatePassword();
     const expiration = new Date(expireAt).toISOString();
     await client({

backend/src/ee/services/dynamic-secret/providers/mongo-db.ts

@@ -1,3 +1,4 @@
+import handlebars from "handlebars";
 import { MongoClient } from "mongodb";
 import { customAlphabet } from "nanoid";
 import { z } from "zod";
@@ -12,8 +13,14 @@ const generatePassword = (size = 48) => {
   return customAlphabet(charset, 48)(size);
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(32);
+  const randomUsername = alphaNumericNanoId(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 MongoDBProvider = (): TDynamicProviderFns => {
@@ -53,11 +60,12 @@ export const MongoDBProvider = (): TDynamicProviderFns => {
     return isConnected;
   };
 
-  const create = async (inputs: unknown) => {
+  const create = async (data: { inputs: unknown; usernameTemplate?: string | null }) => {
+    const { inputs, usernameTemplate } = data;
     const providerInputs = await validateProviderInputs(inputs);
     const client = await $getClient(providerInputs);
 
-    const username = generateUsername();
+    const username = generateUsername(usernameTemplate);
     const password = generatePassword();
 
     const db = client.db(providerInputs.database);

backend/src/ee/services/dynamic-secret/providers/rabbit-mq.ts

@@ -1,4 +1,5 @@
 import axios, { Axios } from "axios";
+import handlebars from "handlebars";
 import https from "https";
 import { customAlphabet } from "nanoid";
 import { z } from "zod";
@@ -14,8 +15,14 @@ const generatePassword = () => {
   return customAlphabet(charset, 64)();
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(32);
+  const randomUsername = alphaNumericNanoId(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)
+  });
 };
 
 type TCreateRabbitMQUser = {
@@ -110,11 +117,12 @@ export const RabbitMqProvider = (): TDynamicProviderFns => {
     return infoResponse;
   };
 
-  const create = async (inputs: unknown) => {
+  const create = async (data: { inputs: unknown; usernameTemplate?: string | null }) => {
+    const { inputs, usernameTemplate } = data;
     const providerInputs = await validateProviderInputs(inputs);
     const connection = await $getClient(providerInputs);
 
-    const username = generateUsername();
+    const username = generateUsername(usernameTemplate);
     const password = generatePassword();
 
     await createRabbitMqUser({

backend/src/ee/services/dynamic-secret/providers/redis.ts

@@ -15,8 +15,14 @@ const generatePassword = () => {
   return customAlphabet(charset, 64)();
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(32);
+  const randomUsername = alphaNumericNanoId(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)
+  });
 };
 
 const executeTransactions = async (connection: Redis, commands: string[]): Promise<(string | null)[] | null> => {
@@ -115,11 +121,12 @@ export const RedisDatabaseProvider = (): TDynamicProviderFns => {
     return pingResponse;
   };
 
-  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);
     const connection = await $getClient(providerInputs);
 
-    const username = generateUsername();
+    const username = generateUsername(usernameTemplate);
     const password = generatePassword();
     const expiration = new Date(expireAt).toISOString();
 

backend/src/ee/services/dynamic-secret/providers/sap-ase.ts

@@ -15,8 +15,14 @@ const generatePassword = (size = 48) => {
   return customAlphabet(charset, 48)(size);
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(25);
+  const randomUsername = `inf_${alphaNumericNanoId(25)}`; // 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)
+  });
 };
 
 enum SapCommands {
@@ -81,11 +87,12 @@ export const SapAseProvider = (): TDynamicProviderFns => {
     return true;
   };
 
-  const create = async (inputs: unknown) => {
+  const create = async (data: { inputs: unknown; usernameTemplate?: string | null }) => {
+    const { inputs, usernameTemplate } = data;
     const providerInputs = await validateProviderInputs(inputs);
 
-    const username = `inf_${generateUsername()}`;
+    const username = generateUsername(usernameTemplate);
-    const password = `${generatePassword()}`;
+    const password = generatePassword();
 
     const client = await $getClient(providerInputs);
     const masterClient = await $getClient(providerInputs, true);

backend/src/ee/services/dynamic-secret/providers/sap-hana.ts

@@ -21,8 +21,14 @@ const generatePassword = (size = 48) => {
   return customAlphabet(charset, 48)(size);
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return alphaNumericNanoId(32);
+  const randomUsername = alphaNumericNanoId(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 SapHanaProvider = (): TDynamicProviderFns => {
@@ -91,10 +97,11 @@ export const SapHanaProvider = (): TDynamicProviderFns => {
     return testResult;
   };
 
-  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);
 
-    const username = generateUsername();
+    const username = generateUsername(usernameTemplate);
     const password = generatePassword();
     const expiration = new Date(expireAt).toISOString();
 

backend/src/ee/services/dynamic-secret/providers/snowflake.ts

@@ -17,8 +17,14 @@ const generatePassword = (size = 48) => {
   return customAlphabet(charset, 48)(size);
 };
 
-const generateUsername = () => {
+const generateUsername = (usernameTemplate?: string | null) => {
-  return `infisical_${alphaNumericNanoId(32)}`; // username must start with alpha character, hence prefix
+  const randomUsername = `infisical_${alphaNumericNanoId(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)
+  });
 };
 
 const getDaysToExpiry = (expiryDate: Date) => {
@@ -82,12 +88,13 @@ export const SnowflakeProvider = (): TDynamicProviderFns => {
     return isValidConnection;
   };
 
-  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);
 
     const client = await $getClient(providerInputs);
 
-    const username = generateUsername();
+    const username = generateUsername(usernameTemplate);
     const password = generatePassword();
 
     try {

backend/src/ee/services/dynamic-secret/providers/sql-database.ts

@@ -104,11 +104,21 @@ const generatePassword = (provider: SqlProviders, requirements?: PasswordRequire
   }
 };
 
-const generateUsername = (provider: SqlProviders) => {
+const generateUsername = (provider: SqlProviders, usernameTemplate?: string | null) => {
-  // For oracle, the client assumes everything is upper case when not using quotes around the password
+  let randomUsername = "";
-  if (provider === SqlProviders.Oracle) return alphaNumericNanoId(32).toUpperCase();
 
-  return alphaNumericNanoId(32);
+  // For oracle, the client assumes everything is upper case when not using quotes around the password
+  if (provider === SqlProviders.Oracle) {
+    randomUsername = alphaNumericNanoId(32).toUpperCase();
+  } else {
+    randomUsername = alphaNumericNanoId(32);
+  }
+  if (!usernameTemplate) return randomUsername;
+
+  return handlebars.compile(usernameTemplate)({
+    randomUsername,
+    unixTimestamp: Math.floor(Date.now() / 100)
+  });
 };
 
 type TSqlDatabaseProviderDTO = {
@@ -210,9 +220,12 @@ export const SqlDatabaseProvider = ({ gatewayService }: TSqlDatabaseProviderDTO)
     return isConnected;
   };
 
-  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);
-    const username = generateUsername(providerInputs.client);
+    const username = generateUsername(providerInputs.client, usernameTemplate);
+
     const password = generatePassword(providerInputs.client, providerInputs.passwordRequirements);
     const gatewayCallback = async (host = providerInputs.host, port = providerInputs.port) => {
       const db = await $getClient({ ...providerInputs, port, host });

backend/src/lib/template/validate-handlebars.ts

@@ -19,3 +19,15 @@ export const validateHandlebarTemplate = (templateName: string, template: string
     throw new BadRequestError({ message: `Template sanitization failed: ${templateName}` });
   });
 };
+
+export const isValidHandleBarTemplate = (template: string, dto: SanitizationArg) => {
+  const parsedAst = handlebars.parse(template);
+  return parsedAst.body.every((el) => {
+    if (el.type === "ContentStatement") return true;
+    if (el.type === "MustacheStatement" && "path" in el) {
+      const { path } = el as { type: "MustacheStatement"; path: { type: "PathExpression"; original: string } };
+      if (path.type === "PathExpression" && dto?.allowedExpressions?.(path.original)) return true;
+    }
+    return false;
+  });
+};

backend/src/server/routes/sanitizedSchemas.ts

@@ -235,11 +235,9 @@ export const SanitizedDynamicSecretSchema = DynamicSecretsSchema.omit({
   inputIV: true,
   inputTag: true,
   algorithm: true
-}).merge(
+}).extend({
-  z.object({
+  metadata: ResourceMetadataSchema.optional()
-    metadata: ResourceMetadataSchema.optional()
+});
-  })
-);
 
 export const SanitizedAuditLogStreamSchema = z.object({
   id: z.string(),