content: /**
   * JBoss, Home of Professional Open Source
   * Copyright Red Hat, Inc., and individual 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.
   */
  package org.jboss.aerogear.unifiedpush.migrator;
  
  import liquibase.change.custom.CustomSqlChange;
  import liquibase.database.Database;
  import liquibase.database.jvm.JdbcConnection;
  import liquibase.exception.CustomChangeException;
  import liquibase.exception.SetupException;
  import liquibase.exception.ValidationErrors;
  import liquibase.resource.ResourceAccessor;
  import liquibase.statement.SqlStatement;
  import liquibase.statement.core.UpdateStatement;
  
  import java.io.ByteArrayOutputStream;
  import java.io.InputStream;
  import java.sql.Blob;
  import java.sql.Connection;
  import java.sql.ResultSet;
  import java.util.ArrayList;
  import java.util.Base64;
  import java.util.List;
  
  public class CertificateBlobToBase64 implements CustomSqlChange {
      private String confirmationMessage = "";
  
      @Override
      public SqlStatement[] generateStatements(Database database) throws CustomChangeException {
          List<SqlStatement> statements = new ArrayList<>();
  
          Connection conn = ((JdbcConnection) (database.getConnection())).getWrappedConnection();
  
          try {
              conn.setAutoCommit(false);
              ResultSet resultSet = conn.createStatement().executeQuery("SELECT id, certificate from ios_variant");
              while (resultSet.next()) {
                  String id = resultSet.getString("id");
                  Blob blob = resultSet.getBlob("certificate");
                  InputStream certificate = blob.getBinaryStream();
                  ByteArrayOutputStream stream = new ByteArrayOutputStream();
                  int bytesRead = -1;
                  byte[] buffer = new byte[1024];
                  while ((bytesRead = certificate.read(buffer)) != -1) {
                      stream.write(buffer, 0, bytesRead);
                  }
                  final String certificateData = Base64.getEncoder().encodeToString(stream.toByteArray());
  
                  UpdateStatement updateStatement = new UpdateStatement(null, null, "ios_variant")
                          .addNewColumnValue("cert_data", certificateData)
                          .setWhereClause("id='" + id + "'");
                  statements.add(updateStatement);
  
              }
              conn.commit();
  
              if (!statements.isEmpty()) {
                  confirmationMessage = "updated certificate data successfully";
              }
  
              return statements.toArray(new SqlStatement[statements.size()]);
          } catch (Exception e) {
              throw new CustomChangeException("Failed to migrate certificate data");
          }
  
      }
  
      @Override
      public String getConfirmationMessage() {
          return confirmationMessage;
      }
  
      @Override
      public void setUp() throws SetupException {
  
      }
  
      @Override
      public void setFileOpener(ResourceAccessor resourceAccessor) {
  
      }
  
      @Override
      public ValidationErrors validate(Database database) {
          return null;
      }
  }
  