apiVersion: v1
kind: ConfigMap
metadata:
  name: mongodb-standalone
data:
  ensure-users.js: |
    const targetDbStr = 'training';
    const rootUser = cat('/etc/k8-training/admin/MONGO_ROOT_USERNAME');
    const rootPass = cat('/etc/k8-training/admin/MONGO_ROOT_PASSWORD');
    const usersStr = cat('/etc/k8-training/MONGO_USERS_LIST');
    // auth against admin
    const adminDb = db.getSiblingDB('admin');
    adminDb.auth(rootUser, rootPass);
    print('Successfully authenticated admin user');
    // we'll create the users here
    const targetDb = db.getSiblingDB(targetDbStr);
    // user-defined roles should be stored in the admin db
    const customRoles = adminDb
      .getRoles({rolesInfo: 1, showBuiltinRoles: false})
      .map(role => role.role)
      .filter(Boolean);
    // parse the list of users, and create each user as needed
    usersStr
      .trim()
      .split(';')
      .map(s => s.split(':'))
      .forEach(user => {
        const username = user[0];
        const rolesStr = user[1];
        const password = user[2];
        if (!rolesStr || !password) {
          return;
        }
        const roles = rolesStr.split(',');
        const userDoc = {
          user: username,
          pwd: password,
        };
        userDoc.roles = roles.map(role => {
          if (!~customRoles.indexOf(role)) {
            // is this a user defined role?
            return role; // no, it is built-in, just use the role name
          }
          return {role: role, db: 'admin'}; // yes, user-defined, specify the long format
        });
        try {
          targetDb.createUser(userDoc);
        } catch (err) {
          if (!~err.message.toLowerCase().indexOf('duplicate')) {
            // if not a duplicate user
            throw err; // rethrow
          }
        }
      });