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EncryptAssignmentTokenGenerator.java
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EncryptAssignmentTokenGenerator.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 org.apache.shardingsphere.encrypt.rewrite.token.generator.BaseEncryptSQLTokenGenerator;
import org.apache.shardingsphere.encrypt.rewrite.token.pojo.EncryptAssignmentToken;
import org.apache.shardingsphere.encrypt.rewrite.token.pojo.EncryptLiteralAssignmentToken;
import org.apache.shardingsphere.encrypt.rewrite.token.pojo.EncryptParameterAssignmentToken;
import org.apache.shardingsphere.infra.rewrite.sql.token.generator.CollectionSQLTokenGenerator;
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.binder.statement.dml.UpdateStatementContext;
import org.apache.shardingsphere.sql.parser.binder.type.TableAvailable;
import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.assignment.AssignmentSegment;
import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.assignment.SetAssignmentSegment;
import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.simple.LiteralExpressionSegment;
import org.apache.shardingsphere.sql.parser.sql.common.segment.dml.expr.simple.ParameterMarkerExpressionSegment;
import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement;
import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.InsertStatement;
import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.UpdateStatement;
import org.apache.shardingsphere.sql.parser.sql.dialect.handler.dml.InsertStatementHandler;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.Optional;
/**
* Assignment generator for encrypt.
*/
public final class EncryptAssignmentTokenGenerator extends BaseEncryptSQLTokenGenerator implements CollectionSQLTokenGenerator {
@Override
protected boolean isGenerateSQLTokenForEncrypt(final SQLStatementContext sqlStatementContext) {
return sqlStatementContext instanceof UpdateStatementContext
|| (sqlStatementContext instanceof InsertStatementContext
&& InsertStatementHandler.getSetAssignmentSegment(((InsertStatementContext) sqlStatementContext).getSqlStatement()).isPresent());
}
@Override
public Collection<EncryptAssignmentToken> generateSQLTokens(final SQLStatementContext sqlStatementContext) {
Collection<EncryptAssignmentToken> result = new LinkedList<>();
String tableName = ((TableAvailable) sqlStatementContext).getAllTables().iterator().next().getTableName().getIdentifier().getValue();
for (AssignmentSegment each : getSetAssignmentSegment(sqlStatementContext.getSqlStatement()).getAssignments()) {
if (getEncryptRule().findEncryptor(tableName, each.getColumn().getIdentifier().getValue()).isPresent()) {
generateSQLToken(tableName, each).ifPresent(result::add);
}
}
return result;
}
private SetAssignmentSegment getSetAssignmentSegment(final SQLStatement sqlStatement) {
if (sqlStatement instanceof InsertStatement) {
Optional<SetAssignmentSegment> result = InsertStatementHandler.getSetAssignmentSegment((InsertStatement) sqlStatement);
Preconditions.checkState(result.isPresent());
return result.get();
}
return ((UpdateStatement) sqlStatement).getSetAssignment();
}
private Optional<EncryptAssignmentToken> generateSQLToken(final String tableName, final AssignmentSegment assignmentSegment) {
if (assignmentSegment.getValue() instanceof ParameterMarkerExpressionSegment) {
return Optional.of(generateParameterSQLToken(tableName, assignmentSegment));
}
if (assignmentSegment.getValue() instanceof LiteralExpressionSegment) {
return Optional.of(generateLiteralSQLToken(tableName, assignmentSegment));
}
return Optional.empty();
}
private EncryptAssignmentToken generateParameterSQLToken(final String tableName, final AssignmentSegment assignmentSegment) {
EncryptParameterAssignmentToken result = new EncryptParameterAssignmentToken(assignmentSegment.getColumn().getStartIndex(), assignmentSegment.getStopIndex());
String columnName = assignmentSegment.getColumn().getIdentifier().getValue();
addCipherColumn(tableName, columnName, result);
addAssistedQueryColumn(tableName, columnName, result);
addPlainColumn(tableName, columnName, result);
return result;
}
private void addCipherColumn(final String tableName, final String columnName, final EncryptParameterAssignmentToken token) {
token.addColumnName(getEncryptRule().getCipherColumn(tableName, columnName));
}
private void addAssistedQueryColumn(final String tableName, final String columnName, final EncryptParameterAssignmentToken token) {
getEncryptRule().findAssistedQueryColumn(tableName, columnName).ifPresent(token::addColumnName);
}
private void addPlainColumn(final String tableName, final String columnName, final EncryptParameterAssignmentToken token) {
getEncryptRule().findPlainColumn(tableName, columnName).ifPresent(token::addColumnName);
}
private EncryptAssignmentToken generateLiteralSQLToken(final String tableName, final AssignmentSegment assignmentSegment) {
EncryptLiteralAssignmentToken result = new EncryptLiteralAssignmentToken(assignmentSegment.getColumn().getStartIndex(), assignmentSegment.getStopIndex());
addCipherAssignment(tableName, assignmentSegment, result);
addAssistedQueryAssignment(tableName, assignmentSegment, result);
addPlainAssignment(tableName, assignmentSegment, result);
return result;
}
private void addCipherAssignment(final String tableName, final AssignmentSegment assignmentSegment, final EncryptLiteralAssignmentToken token) {
Object originalValue = ((LiteralExpressionSegment) assignmentSegment.getValue()).getLiterals();
Object cipherValue = getEncryptRule().getEncryptValues(tableName, assignmentSegment.getColumn().getIdentifier().getValue(), Collections.singletonList(originalValue)).iterator().next();
token.addAssignment(getEncryptRule().getCipherColumn(tableName, assignmentSegment.getColumn().getIdentifier().getValue()), cipherValue);
}
private void addAssistedQueryAssignment(final String tableName, final AssignmentSegment assignmentSegment, final EncryptLiteralAssignmentToken token) {
Object originalValue = ((LiteralExpressionSegment) assignmentSegment.getValue()).getLiterals();
Optional<String> assistedQueryColumn = getEncryptRule().findAssistedQueryColumn(tableName, assignmentSegment.getColumn().getIdentifier().getValue());
assistedQueryColumn.ifPresent(s -> {
Object assistedQueryValue = getEncryptRule().getEncryptAssistedQueryValues(
tableName, assignmentSegment.getColumn().getIdentifier().getValue(), Collections.singletonList(originalValue)).iterator().next();
token.addAssignment(s, assistedQueryValue);
});
}
private void addPlainAssignment(final String tableName, final AssignmentSegment assignmentSegment, final EncryptLiteralAssignmentToken token) {
Object originalValue = ((LiteralExpressionSegment) assignmentSegment.getValue()).getLiterals();
getEncryptRule().findPlainColumn(tableName, assignmentSegment.getColumn().getIdentifier().getValue()).ifPresent(plainColumn -> token.addAssignment(plainColumn, originalValue));
}
}