feat: write REST API endpoint to delete role

packages/backend/src/controllers/api/v1/admin/roles/delete-role.ee.js

@@ -0,0 +1,11 @@
+import Role from '../../../../../models/role.js';
+
+export default async (request, response) => {
+  const role = await Role.query()
+    .findById(request.params.roleId)
+    .throwIfNotFound();
+
+  await role.deleteWithPermissions();
+
+  response.status(204).end();
+};

packages/backend/src/controllers/api/v1/admin/roles/delete-role.ee.test.js

@@ -0,0 +1,112 @@
+import Crypto from 'node:crypto';
+import { vi, describe, it, expect, beforeEach } from 'vitest';
+import request from 'supertest';
+import app from '../../../../../app.js';
+import createAuthTokenByUserId from '../../../../../helpers/create-auth-token-by-user-id.js';
+import { createRole } from '../../../../../../test/factories/role.js';
+import { createPermission } from '../../../../../../test/factories/permission.js';
+import { createSamlAuthProvider } from '../../../../../../test/factories/saml-auth-provider.ee.js';
+import { createUser } from '../../../../../../test/factories/user.js';
+import * as license from '../../../../../helpers/license.ee.js';
+
+describe('DELETE /api/v1/admin/roles/:roleId', () => {
+  let adminRole, currentUser, token;
+
+  beforeEach(async () => {
+    vi.spyOn(license, 'hasValidLicense').mockResolvedValue(true);
+
+    adminRole = await createRole({ name: 'Admin' });
+
+    currentUser = await createUser({ roleId: adminRole.id });
+
+    token = await createAuthTokenByUserId(currentUser.id);
+  });
+
+  it('should return HTTP 204 for unused role', async () => {
+    const role = await createRole();
+    const permission = await createPermission({ roleId: role.id });
+
+    await request(app)
+      .delete(`/api/v1/admin/roles/${role.id}`)
+      .set('Authorization', token)
+      .expect(204);
+
+    const refetchedRole = await role.$query();
+    const refetchedPermission = await permission.$query();
+
+    expect(refetchedRole).toBeUndefined();
+    expect(refetchedPermission).toBeUndefined();
+  });
+
+  it('should return HTTP 404 for not existing role UUID', async () => {
+    const notExistingRoleUUID = Crypto.randomUUID();
+
+    await request(app)
+      .delete(`/api/v1/admin/roles/${notExistingRoleUUID}`)
+      .set('Authorization', token)
+      .expect(404);
+  });
+
+  it('should return not authorized response for deleting admin role', async () => {
+    await request(app)
+      .delete(`/api/v1/admin/roles/${adminRole.id}`)
+      .set('Authorization', token)
+      .expect(403);
+  });
+
+  it('should return unprocessable entity response for role used by users', async () => {
+    const role = await createRole();
+    await createUser({ roleId: role.id });
+
+    const response = await request(app)
+      .delete(`/api/v1/admin/roles/${role.id}`)
+      .set('Authorization', token)
+      .expect(422);
+
+    expect(response.body).toStrictEqual({
+      errors: {
+        role: [`All users must be migrated away from the "${role.name}" role.`],
+      },
+      meta: {
+        type: 'ValidationError',
+      },
+    });
+  });
+
+  it('should return unprocessable entity response for role used by saml auth providers', async () => {
+    const samlAuthProvider = await createSamlAuthProvider();
+
+    const response = await request(app)
+      .delete(`/api/v1/admin/roles/${samlAuthProvider.defaultRoleId}`)
+      .set('Authorization', token)
+      .expect(422);
+
+    expect(response.body).toStrictEqual({
+      errors: {
+        samlAuthProvider: [
+          'You need to change the default role in the SAML configuration before deleting this role.',
+        ],
+      },
+      meta: {
+        type: 'ValidationError',
+      },
+    });
+  });
+
+  it('should not delete role and permissions on unsuccessful response', async () => {
+    const role = await createRole();
+    const permission = await createPermission({ roleId: role.id });
+    await createUser({ roleId: role.id });
+
+    await request(app)
+      .delete(`/api/v1/admin/roles/${role.id}`)
+      .set('Authorization', token)
+      .expect(422);
+
+    const refetchedRole = await role.$query();
+    const refetchedPermission = await permission.$query();
+
+    expect(refetchedRole).toStrictEqual(role);
+    expect(refetchedPermission).toStrictEqual(permission);
+  });
+});

packages/backend/src/models/role.js

@@ -1,6 +1,8 @@
+import { ValidationError } from 'objection';
 import Base from './base.js';
 import Permission from './permission.js';
 import User from './user.js';
+import SamlAuthProvider from './saml-auth-provider.ee.js';
 import NotAuthorizedError from '../errors/not-authorized.js';
 
 class Role extends Base {
@@ -85,6 +87,59 @@ class Role extends Base {
         });
     });
   }
+
+  async deleteWithPermissions() {
+    return await Role.transaction(async (trx) => {
+      await this.$relatedQuery('permissions', trx).delete();
+
+      return await this.$query(trx).delete();
+    });
+  }
+
+  async $beforeDelete(queryContext) {
+    await super.$beforeDelete(queryContext);
+
+    if (this.isAdmin) {
+      throw new NotAuthorizedError('The admin role cannot be deleted!');
+    }
+
+    const userCount = await this.$relatedQuery('users').limit(1).resultSize();
+    const hasUsers = userCount > 0;
+
+    if (hasUsers) {
+      throw new ValidationError({
+        data: {
+          role: [
+            {
+              message: `All users must be migrated away from the "${this.name}" role.`,
+            },
+          ],
+        },
+        type: 'ValidationError',
+      });
+    }
+
+    const samlAuthProviderUsingDefaultRole = await SamlAuthProvider.query()
+      .where({
+        default_role_id: this.id,
+      })
+      .limit(1)
+      .first();
+
+    if (samlAuthProviderUsingDefaultRole) {
+      throw new ValidationError({
+        data: {
+          samlAuthProvider: [
+            {
+              message:
+                'You need to change the default role in the SAML configuration before deleting this role.',
+            },
+          ],
+        },
+        type: 'ValidationError',
+      });
+    }
+  }
 }
 
 export default Role;

packages/backend/src/routes/api/v1/admin/roles.ee.js

@@ -6,6 +6,7 @@ import createRoleAction from '../../../../controllers/api/v1/admin/roles/create-
 import getRolesAction from '../../../../controllers/api/v1/admin/roles/get-roles.ee.js';
 import getRoleAction from '../../../../controllers/api/v1/admin/roles/get-role.ee.js';
 import updateRoleAction from '../../../../controllers/api/v1/admin/roles/update-role.ee.js';
+import deleteRoleAction from '../../../../controllers/api/v1/admin/roles/delete-role.ee.js';
 
 const router = Router();
 
@@ -41,4 +42,12 @@ router.patch(
   updateRoleAction
 );
 
+router.delete(
+  '/:roleId',
+  authenticateUser,
+  authorizeAdmin,
+  checkIsEnterprise,
+  deleteRoleAction
+);
+
 export default router;