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EncryptForUseDefaultInsertColumnsTokenGenerator.java
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EncryptForUseDefaultInsertColumnsTokenGenerator.java
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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.shardingsphere.encrypt.rewrite.token.generator.impl;
import com.google.common.base.Preconditions;
import lombok.Setter;
import org.apache.shardingsphere.encrypt.rewrite.token.generator.BaseEncryptSQLTokenGenerator;
import org.apache.shardingsphere.encrypt.rule.EncryptTable;
import org.apache.shardingsphere.infra.rewrite.sql.token.generator.OptionalSQLTokenGenerator;
import org.apache.shardingsphere.infra.rewrite.sql.token.generator.aware.PreviousSQLTokensAware;
import org.apache.shardingsphere.infra.rewrite.sql.token.pojo.SQLToken;
import org.apache.shardingsphere.infra.rewrite.sql.token.pojo.generic.UseDefaultInsertColumnsToken;
import org.apache.shardingsphere.sql.parser.binder.statement.SQLStatementContext;
import org.apache.shardingsphere.sql.parser.binder.statement.dml.InsertStatementContext;
import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.column.InsertColumnsSegment;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
/**
* Use default insert columns token generator for encrypt.
*/
@Setter
public final class EncryptForUseDefaultInsertColumnsTokenGenerator extends BaseEncryptSQLTokenGenerator implements OptionalSQLTokenGenerator<InsertStatementContext>, PreviousSQLTokensAware {
private List<SQLToken> previousSQLTokens;
@Override
protected boolean isGenerateSQLTokenForEncrypt(final SQLStatementContext sqlStatementContext) {
return sqlStatementContext instanceof InsertStatementContext && ((InsertStatementContext) sqlStatementContext).useDefaultColumns();
}
@Override
public UseDefaultInsertColumnsToken generateSQLToken(final InsertStatementContext insertStatementContext) {
String tableName = insertStatementContext.getSqlStatement().getTable().getTableName().getIdentifier().getValue();
Optional<UseDefaultInsertColumnsToken> previousSQLToken = findInsertColumnsToken();
if (previousSQLToken.isPresent()) {
processPreviousSQLToken(previousSQLToken.get(), insertStatementContext, tableName);
return previousSQLToken.get();
}
return generateNewSQLToken(insertStatementContext, tableName);
}
private Optional<UseDefaultInsertColumnsToken> findInsertColumnsToken() {
for (SQLToken each : previousSQLTokens) {
if (each instanceof UseDefaultInsertColumnsToken) {
return Optional.of((UseDefaultInsertColumnsToken) each);
}
}
return Optional.empty();
}
private void processPreviousSQLToken(final UseDefaultInsertColumnsToken previousSQLToken, final InsertStatementContext insertStatementContext, final String tableName) {
Optional<EncryptTable> encryptTable = getEncryptRule().findEncryptTable(tableName);
Preconditions.checkState(encryptTable.isPresent());
List<String> columnNames = getColumnNames(insertStatementContext, encryptTable.get(), previousSQLToken.getColumns());
previousSQLToken.getColumns().clear();
previousSQLToken.getColumns().addAll(columnNames);
}
private UseDefaultInsertColumnsToken generateNewSQLToken(final InsertStatementContext insertStatementContext, final String tableName) {
Optional<InsertColumnsSegment> insertColumnsSegment = insertStatementContext.getSqlStatement().getInsertColumns();
Preconditions.checkState(insertColumnsSegment.isPresent());
Optional<EncryptTable> encryptTable = getEncryptRule().findEncryptTable(tableName);
Preconditions.checkState(encryptTable.isPresent());
return new UseDefaultInsertColumnsToken(insertColumnsSegment.get().getStopIndex(), getColumnNames(insertStatementContext, encryptTable.get(), insertStatementContext.getColumnNames()));
}
private List<String> getColumnNames(final InsertStatementContext sqlStatementContext, final EncryptTable encryptTable, final List<String> currentColumnNames) {
List<String> result = new LinkedList<>(currentColumnNames);
Iterator<String> descendingColumnNames = sqlStatementContext.getDescendingColumnNames();
while (descendingColumnNames.hasNext()) {
String columnName = descendingColumnNames.next();
if (encryptTable.findEncryptorName(columnName).isPresent()) {
int columnIndex = result.indexOf(columnName);
addPlainColumn(result, encryptTable, columnName, columnIndex);
addAssistedQueryColumn(result, encryptTable, columnName, columnIndex);
setCipherColumn(result, encryptTable, columnName, columnIndex);
}
}
return result;
}
private void addPlainColumn(final List<String> columnNames, final EncryptTable encryptTable, final String columnName, final int columnIndex) {
encryptTable.findPlainColumn(columnName).ifPresent(plainColumn -> columnNames.add(columnIndex + 1, plainColumn));
}
private void addAssistedQueryColumn(final List<String> columnNames, final EncryptTable encryptTable, final String columnName, final int columnIndex) {
encryptTable.findAssistedQueryColumn(columnName).ifPresent(assistedQueryColumn -> columnNames.add(columnIndex + 1, assistedQueryColumn));
}
private void setCipherColumn(final List<String> columnNames, final EncryptTable encryptTable, final String columnName, final int columnIndex) {
columnNames.set(columnIndex, encryptTable.getCipherColumn(columnName));
}
}