extended deleteTenant API to allow tenant admins delete tenant

application/src/main/java/org/thingsboard/server/controller/TenantController.java

@@ -115,7 +115,7 @@ public class TenantController extends BaseController {
 
     @ApiOperation(value = "Delete Tenant (deleteTenant)",
             notes = "Deletes the tenant, it's customers, rule chains, devices and all other related entities. Referencing non-existing tenant Id will cause an error." + SYSTEM_AUTHORITY_PARAGRAPH)
-    @PreAuthorize("hasAuthority('SYS_ADMIN')")
+    @PreAuthorize("hasAnyAuthority('SYS_ADMIN', 'TENANT_ADMIN')")
     @RequestMapping(value = "/tenant/{tenantId}", method = RequestMethod.DELETE)
     @ResponseStatus(value = HttpStatus.OK)
     public void deleteTenant(@Parameter(description = TENANT_ID_PARAM_DESCRIPTION)

application/src/main/java/org/thingsboard/server/service/security/permission/TenantAdminPermissions.java

@@ -73,7 +73,7 @@ public class TenantAdminPermissions extends AbstractPermissions {
     };
 
     private static final PermissionChecker tenantPermissionChecker =
-            new PermissionChecker.GenericPermissionChecker(Operation.READ, Operation.READ_ATTRIBUTES, Operation.READ_TELEMETRY) {
+            new PermissionChecker.GenericPermissionChecker(Operation.READ, Operation.READ_ATTRIBUTES, Operation.READ_TELEMETRY, Operation.DELETE) {
 
                 @Override
                 @SuppressWarnings("unchecked")

application/src/test/java/org/thingsboard/server/controller/TenantControllerTest.java

@@ -243,6 +243,29 @@ public class TenantControllerTest extends AbstractControllerTest {
                 .andExpect(statusReason(containsString(msgErrorNoFound("Tenant", tenantIdStr))));
     }
 
+    @Test
+    public void testDeleteTenantByTenantAdmin() throws Exception {
+        loginSysAdmin();
+        Tenant tenant = new Tenant();
+        tenant.setTitle("My tenant");
+        Tenant savedTenant = saveTenant(tenant);
+
+        //login as tenant admin
+        User tenantAdminUser = new User();
+        tenantAdminUser.setAuthority(Authority.TENANT_ADMIN);
+        tenantAdminUser.setTenantId(savedTenant.getId());
+        tenantAdminUser.setEmail("tenantToDelete@thingsboard.io");
+
+        createUserAndLogin(tenantAdminUser, TENANT_ADMIN_PASSWORD);
+
+        String tenantIdStr = savedTenant.getId().getId().toString();
+        deleteTenant(savedTenant.getId());
+        loginSysAdmin();
+        doGet("/api/tenant/" + tenantIdStr)
+                .andExpect(status().isNotFound())
+                .andExpect(statusReason(containsString(msgErrorNoFound("Tenant", tenantIdStr))));
+    }
+
     @Test
     public void testFindTenants() throws Exception {
         loginSysAdmin();