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Shaded version of Apache Hive JDBC driver for Presto

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
package org.apache.hive.service.auth;

import javax.security.sasl.AuthenticationException;

public class AuthenticationProviderFactory {

  public static enum AuthMethods {
    LDAP("LDAP"),
    PAM("PAM"),
    CUSTOM("CUSTOM"),
    NONE("NONE");

    String authMethod;

    AuthMethods(String authMethod) {
      this.authMethod = authMethod;
    }

    public String getAuthMethod() {
      return authMethod;
    }

    public static AuthMethods getValidAuthMethod(String authMethodStr) throws AuthenticationException {
      for (AuthMethods auth : AuthMethods.values()) {
        if (authMethodStr.equals(auth.getAuthMethod())) {
          return auth;
        }
      }
      throw new AuthenticationException("Not a valid authentication method");
    }
  }

  private AuthenticationProviderFactory () {
  }

  public static PasswdAuthenticationProvider getAuthenticationProvider(AuthMethods authMethod)
      throws AuthenticationException {
    if (authMethod.equals(AuthMethods.LDAP)) {
      return new LdapAuthenticationProviderImpl();
    }
    else if (authMethod.equals(AuthMethods.PAM)) {
      return new PamAuthenticationProviderImpl();
    }
    else if (authMethod.equals(AuthMethods.CUSTOM)) {
      return new CustomAuthenticationProviderImpl();
    }
    else if (authMethod.equals(AuthMethods.NONE)) {
      return new AnonymousAuthenticationProviderImpl();
    }
    else {
      throw new AuthenticationException("Unsupported authentication method");
    }
  }
}