Allow server admins to grant server admin access to other users

backend/src/server/routes/v1/admin-router.ts

@@ -211,6 +211,27 @@ export const registerAdminRouter = async (server: FastifyZodProvider) => {
     }
   });
 
+  server.route({
+    method: "PATCH",
+    url: "/user-management/users/grant-admin-access",
+    config: {
+      rateLimit: writeLimit
+    },
+    schema: {
+      body: z.object({
+        userId: z.string()
+      })
+    },
+    onRequest: (req, res, done) => {
+      verifyAuth([AuthMode.JWT])(req, res, () => {
+        verifySuperAdmin(req, res, done);
+      });
+    },
+    handler: async (req) => {
+      await server.services.superAdmin.grantServerAdminAccessToUser(req.body.userId);
+    }
+  });
+
   server.route({
     method: "GET",
     url: "/encryption-strategies",

backend/src/services/super-admin/super-admin-service.ts

@@ -291,6 +291,18 @@ export const superAdminServiceFactory = ({
     return user;
   };
 
+  const grantServerAdminAccessToUser = async (userId: string) => {
+    if (!licenseService.onPremFeatures?.instanceUserManagement) {
+      throw new BadRequestError({
+        message: "Failed to grant server admin access to user due to plan restriction. Upgrade to Infisical's Pro plan."
+      });
+    }
+
+    await userDAL.transaction(async (tx) => {
+      await userDAL.updateById(userId, { superAdmin: true }, tx);
+    });
+  };
+
   const getAdminSlackConfig = async () => {
     const serverCfg = await serverCfgDAL.findById(ADMIN_CONFIG_DB_UUID);
 
@@ -381,6 +393,7 @@ export const superAdminServiceFactory = ({
     deleteUser,
     getAdminSlackConfig,
     updateRootEncryptionStrategy,
-    getConfiguredEncryptionStrategies
+    getConfiguredEncryptionStrategies,
+    grantServerAdminAccessToUser
   };
 };