checkEmptyBranch.ts

/**
 * Copyright 2026 GitProxy Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Request } from 'express';
import simpleGit from 'simple-git';

import { Action, Step } from '../../actions';
import { EMPTY_COMMIT_HASH } from '../constants';
import { handleErrorAndLog } from '../../../utils/errors';

const isEmptyBranch = async (action: Action): Promise<boolean> => {
  if (action.commitFrom === EMPTY_COMMIT_HASH) {
    try {
      const git = simpleGit(`${action.proxyGitPath}/${action.repoName}`);

      const type = await git.raw(['cat-file', '-t', action.commitTo || '']);
      return type.trim() === 'commit';
    } catch (error: unknown) {
      handleErrorAndLog(error, `Error checking if branch is empty`);
    }
  }

  return false;
};

const exec = async (_req: Request, action: Action): Promise<Action> => {
  const step = new Step('checkEmptyBranch');

  if (action.commitData && action.commitData.length > 0) {
    return action;
  }

  if (await isEmptyBranch(action)) {
    step.setError('Push blocked: Empty branch. Please make a commit before pushing a new branch.');
    action.addStep(step);
    step.error = true;
    return action;
  } else {
    step.setError(
      'Push blocked: Commit data not found. Please contact an administrator for support.',
    );
    action.addStep(step);
    step.error = true;
    return action;
  }
};

exec.displayName = 'checkEmptyBranch.exec';

export { exec };