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/*
* Copyright (c) 2002, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.jdbc;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.TimeZone;
import com.mysql.cj.Messages;
import com.mysql.cj.exceptions.ExceptionInterceptor;
import com.mysql.cj.exceptions.MysqlErrorNumbers;
import com.mysql.cj.jdbc.exceptions.SQLError;
import com.mysql.cj.util.EscapeTokenizer;
import com.mysql.cj.util.StringUtils;
import com.mysql.cj.util.TimeUtil;
/**
* EscapeProcessor performs all escape code processing as outlined in the JDBC spec by JavaSoft.
*/
class EscapeProcessor {
private static Map JDBC_CONVERT_TO_MYSQL_TYPE_MAP;
static {
Map tempMap = new HashMap<>();
tempMap.put("BIGINT", "0 + ?");
tempMap.put("BINARY", "BINARY");
tempMap.put("BIT", "0 + ?");
tempMap.put("CHAR", "CHAR");
tempMap.put("DATE", "DATE");
tempMap.put("DECIMAL", "0.0 + ?");
tempMap.put("DOUBLE", "0.0 + ?");
tempMap.put("FLOAT", "0.0 + ?");
tempMap.put("INTEGER", "0 + ?");
tempMap.put("LONGVARBINARY", "BINARY");
tempMap.put("LONGVARCHAR", "CONCAT(?)");
tempMap.put("REAL", "0.0 + ?");
tempMap.put("SMALLINT", "CONCAT(?)");
tempMap.put("TIME", "TIME");
tempMap.put("TIMESTAMP", "DATETIME");
tempMap.put("TINYINT", "CONCAT(?)");
tempMap.put("VARBINARY", "BINARY");
tempMap.put("VARCHAR", "CONCAT(?)");
JDBC_CONVERT_TO_MYSQL_TYPE_MAP = Collections.unmodifiableMap(tempMap);
}
/**
* Escape process one string
*
* @param sql
* the SQL to escape process.
* @param serverTimeZone
* server time zone
* @param serverSupportsFractionalSecond
* flag indicating if server supports fractional seconds
* @param serverTruncatesFractionalSecond
* flag indicating if server truncates fractional seconds (sql_mode contains TIME_TRUNCATE_FRACTIONAL)
* @param exceptionInterceptor
* exception interceptor
*
* @return the SQL after it has been escape processed.
*
* @throws SQLException
* if error occurs
*/
public static final Object escapeSQL(String sql, TimeZone serverTimeZone, boolean serverSupportsFractionalSecond, boolean serverTruncatesFractionalSecond,
ExceptionInterceptor exceptionInterceptor) throws java.sql.SQLException {
boolean replaceEscapeSequence = false;
String escapeSequence = null;
if (sql == null) {
return null;
}
/*
* Short circuit this code if we don't have a matching pair of "{}". - Suggested by Ryan Gustafason
*/
int beginBrace = sql.indexOf('{');
int nextEndBrace = (beginBrace == -1) ? (-1) : sql.indexOf('}', beginBrace);
if (nextEndBrace == -1) {
return sql;
}
StringBuilder newSql = new StringBuilder();
EscapeTokenizer escapeTokenizer = new EscapeTokenizer(sql);
byte usesVariables = StatementImpl.USES_VARIABLES_FALSE;
boolean callingStoredFunction = false;
while (escapeTokenizer.hasMoreTokens()) {
String token = escapeTokenizer.nextToken();
if (token.length() != 0) {
if (token.charAt(0) == '{') { // It's an escape code
if (!token.endsWith("}")) {
throw SQLError.createSQLException(Messages.getString("EscapeProcessor.0", new Object[] { token }), exceptionInterceptor);
}
if (token.length() > 2) {
int nestedBrace = token.indexOf('{', 2);
if (nestedBrace != -1) {
StringBuilder buf = new StringBuilder(token.substring(0, 1));
Object remainingResults = escapeSQL(token.substring(1, token.length() - 1), serverTimeZone, serverSupportsFractionalSecond,
serverTruncatesFractionalSecond, exceptionInterceptor);
String remaining = null;
if (remainingResults instanceof String) {
remaining = (String) remainingResults;
} else {
remaining = ((EscapeProcessorResult) remainingResults).escapedSql;
if (usesVariables != StatementImpl.USES_VARIABLES_TRUE) {
usesVariables = ((EscapeProcessorResult) remainingResults).usesVariables;
}
}
buf.append(remaining);
buf.append('}');
token = buf.toString();
}
}
// nested escape code
// Compare to tokens with _no_ whitespace
String collapsedToken = removeWhitespace(token);
/*
* Process the escape code
*/
if (StringUtils.startsWithIgnoreCase(collapsedToken, "{escape")) {
try {
StringTokenizer st = new StringTokenizer(token, " '");
st.nextToken(); // eat the "escape" token
escapeSequence = st.nextToken();
if (escapeSequence.length() < 3) {
newSql.append(token); // it's just part of the query, push possible syntax errors onto server's shoulders
} else {
escapeSequence = escapeSequence.substring(1, escapeSequence.length() - 1);
replaceEscapeSequence = true;
}
} catch (java.util.NoSuchElementException e) {
newSql.append(token); // it's just part of the query, push possible syntax errors onto server's shoulders
}
} else if (StringUtils.startsWithIgnoreCase(collapsedToken, "{fn")) {
int startPos = token.toLowerCase().indexOf("fn ") + 3;
int endPos = token.length() - 1; // no }
String fnToken = token.substring(startPos, endPos);
// We need to handle 'convert' by ourselves
if (StringUtils.startsWithIgnoreCaseAndWs(fnToken, "convert")) {
newSql.append(processConvertToken(fnToken, exceptionInterceptor));
} else {
// just pass functions right to the DB
newSql.append(fnToken);
}
} else if (StringUtils.startsWithIgnoreCase(collapsedToken, "{d")) {
int startPos = token.indexOf('\'') + 1;
int endPos = token.lastIndexOf('\''); // no }
if ((startPos == -1) || (endPos == -1)) {
newSql.append(token); // it's just part of the query, push possible syntax errors onto server's shoulders
} else {
String argument = token.substring(startPos, endPos);
try {
StringTokenizer st = new StringTokenizer(argument, " -");
String year4 = st.nextToken();
String month2 = st.nextToken();
String day2 = st.nextToken();
String dateString = "'" + year4 + "-" + month2 + "-" + day2 + "'";
newSql.append(dateString);
} catch (java.util.NoSuchElementException e) {
throw SQLError.createSQLException(Messages.getString("EscapeProcessor.1", new Object[] { argument }),
MysqlErrorNumbers.SQL_STATE_SYNTAX_ERROR, exceptionInterceptor);
}
}
} else if (StringUtils.startsWithIgnoreCase(collapsedToken, "{ts")) {
processTimestampToken(serverTimeZone, newSql, token, serverSupportsFractionalSecond, serverTruncatesFractionalSecond,
exceptionInterceptor);
} else if (StringUtils.startsWithIgnoreCase(collapsedToken, "{t")) {
processTimeToken(newSql, token, serverSupportsFractionalSecond, exceptionInterceptor);
} else if (StringUtils.startsWithIgnoreCase(collapsedToken, "{call") || StringUtils.startsWithIgnoreCase(collapsedToken, "{?=call")) {
int startPos = StringUtils.indexOfIgnoreCase(token, "CALL") + 5;
int endPos = token.length() - 1;
if (StringUtils.startsWithIgnoreCase(collapsedToken, "{?=call")) {
callingStoredFunction = true;
newSql.append("SELECT ");
newSql.append(token.substring(startPos, endPos));
} else {
callingStoredFunction = false;
newSql.append("CALL ");
newSql.append(token.substring(startPos, endPos));
}
for (int i = endPos - 1; i >= startPos; i--) {
char c = token.charAt(i);
if (Character.isWhitespace(c)) {
continue;
}
if (c != ')') {
newSql.append("()"); // handle no-parenthesis no-arg call not supported by MySQL parser
}
break;
}
} else if (StringUtils.startsWithIgnoreCase(collapsedToken, "{oj")) {
// MySQL already handles this escape sequence because of ODBC. Cool.
newSql.append(token);
} else {
// not an escape code, just part of the query
newSql.append(token);
}
} else {
newSql.append(token); // it's just part of the query
}
}
}
String escapedSql = newSql.toString();
//
// FIXME: Let MySQL do this, however requires lightweight parsing of statement
//
if (replaceEscapeSequence) {
String currentSql = escapedSql;
while (currentSql.indexOf(escapeSequence) != -1) {
int escapePos = currentSql.indexOf(escapeSequence);
String lhs = currentSql.substring(0, escapePos);
String rhs = currentSql.substring(escapePos + 1, currentSql.length());
currentSql = lhs + "\\" + rhs;
}
escapedSql = currentSql;
}
EscapeProcessorResult epr = new EscapeProcessorResult();
epr.escapedSql = escapedSql;
epr.callingStoredFunction = callingStoredFunction;
if (usesVariables != StatementImpl.USES_VARIABLES_TRUE) {
if (escapeTokenizer.sawVariableUse()) {
epr.usesVariables = StatementImpl.USES_VARIABLES_TRUE;
} else {
epr.usesVariables = StatementImpl.USES_VARIABLES_FALSE;
}
}
return epr;
}
private static void processTimeToken(StringBuilder newSql, String token, boolean serverSupportsFractionalSecond, ExceptionInterceptor exceptionInterceptor)
throws SQLException {
int startPos = token.indexOf('\'') + 1;
int endPos = token.lastIndexOf('\''); // no }
if ((startPos == -1) || (endPos == -1)) {
newSql.append(token); // it's just part of the query, push possible syntax errors onto server's shoulders
} else {
String argument = token.substring(startPos, endPos);
try {
StringTokenizer st = new StringTokenizer(argument, " :.");
String hour = st.nextToken();
String minute = st.nextToken();
String second = st.nextToken();
String fractionalSecond = "";
if (serverSupportsFractionalSecond && st.hasMoreTokens()) {
fractionalSecond = "." + st.nextToken();
}
newSql.append("'");
newSql.append(hour);
newSql.append(":");
newSql.append(minute);
newSql.append(":");
newSql.append(second);
if (serverSupportsFractionalSecond) {
newSql.append(fractionalSecond);
}
newSql.append("'");
} catch (java.util.NoSuchElementException e) {
throw SQLError.createSQLException(Messages.getString("EscapeProcessor.3", new Object[] { argument }), MysqlErrorNumbers.SQL_STATE_SYNTAX_ERROR,
exceptionInterceptor);
}
}
}
private static void processTimestampToken(TimeZone tz, StringBuilder newSql, String token, boolean serverSupportsFractionalSecond,
boolean serverTruncatesFractionalSecond, ExceptionInterceptor exceptionInterceptor) throws SQLException {
int startPos = token.indexOf('\'') + 1;
int endPos = token.lastIndexOf('\''); // no }
if ((startPos == -1) || (endPos == -1)) {
newSql.append(token); // it's just part of the query, push possible syntax errors onto server's shoulders
} else {
String argument = token.substring(startPos, endPos);
try {
Timestamp ts = Timestamp.valueOf(argument);
ts = TimeUtil.adjustNanosPrecision(ts, 6, !serverTruncatesFractionalSecond);
SimpleDateFormat tsdf = TimeUtil.getSimpleDateFormat(null, "''yyyy-MM-dd HH:mm:ss", tz);
newSql.append(tsdf.format(ts));
if (serverSupportsFractionalSecond && ts.getNanos() > 0) {
newSql.append('.');
newSql.append(TimeUtil.formatNanos(ts.getNanos(), 6));
}
newSql.append('\'');
} catch (IllegalArgumentException illegalArgumentException) {
SQLException sqlEx = SQLError.createSQLException(Messages.getString("EscapeProcessor.2", new Object[] { argument }),
MysqlErrorNumbers.SQL_STATE_SYNTAX_ERROR, exceptionInterceptor);
sqlEx.initCause(illegalArgumentException);
throw sqlEx;
}
}
}
/**
* Re-writes {fn convert (expr, type)} as cast(expr AS type)
*
* @param functionToken
* token
* @param exceptionInterceptor
* exception interceptor
* @return result of rewriting
* @throws SQLException
* if error occurs
*/
private static String processConvertToken(String functionToken, ExceptionInterceptor exceptionInterceptor) throws SQLException {
// The JDBC spec requires these types:
//
// BIGINT
// BINARY
// BIT
// CHAR
// DATE
// DECIMAL
// DOUBLE
// FLOAT
// INTEGER
// LONGVARBINARY
// LONGVARCHAR
// REAL
// SMALLINT
// TIME
// TIMESTAMP
// TINYINT
// VARBINARY
// VARCHAR
// MySQL supports these types:
//
// BINARY
// CHAR
// DATE
// DATETIME
// SIGNED (integer)
// UNSIGNED (integer)
// TIME
int firstIndexOfParen = functionToken.indexOf("(");
if (firstIndexOfParen == -1) {
throw SQLError.createSQLException(Messages.getString("EscapeProcessor.4", new Object[] { functionToken }), MysqlErrorNumbers.SQL_STATE_SYNTAX_ERROR,
exceptionInterceptor);
}
int indexOfComma = functionToken.lastIndexOf(",");
if (indexOfComma == -1) {
throw SQLError.createSQLException(Messages.getString("EscapeProcessor.5", new Object[] { functionToken }), MysqlErrorNumbers.SQL_STATE_SYNTAX_ERROR,
exceptionInterceptor);
}
int indexOfCloseParen = functionToken.indexOf(')', indexOfComma);
if (indexOfCloseParen == -1) {
throw SQLError.createSQLException(Messages.getString("EscapeProcessor.6", new Object[] { functionToken }), MysqlErrorNumbers.SQL_STATE_SYNTAX_ERROR,
exceptionInterceptor);
}
String expression = functionToken.substring(firstIndexOfParen + 1, indexOfComma);
String type = functionToken.substring(indexOfComma + 1, indexOfCloseParen);
String newType = null;
String trimmedType = type.trim();
if (StringUtils.startsWithIgnoreCase(trimmedType, "SQL_")) {
trimmedType = trimmedType.substring(4, trimmedType.length());
}
newType = JDBC_CONVERT_TO_MYSQL_TYPE_MAP.get(trimmedType.toUpperCase(Locale.ENGLISH));
if (newType == null) {
throw SQLError.createSQLException(Messages.getString("EscapeProcessor.7", new Object[] { type.trim() }), MysqlErrorNumbers.SQL_STATE_GENERAL_ERROR,
exceptionInterceptor);
}
int replaceIndex = newType.indexOf("?");
if (replaceIndex != -1) {
StringBuilder convertRewrite = new StringBuilder(newType.substring(0, replaceIndex));
convertRewrite.append(expression);
convertRewrite.append(newType.substring(replaceIndex + 1, newType.length()));
return convertRewrite.toString();
}
StringBuilder castRewrite = new StringBuilder("CAST(");
castRewrite.append(expression);
castRewrite.append(" AS ");
castRewrite.append(newType);
castRewrite.append(")");
return castRewrite.toString();
}
/**
* Removes all whitespace from the given String. We use this to make escape
* token comparison white-space ignorant.
*
* @param toCollapse
* the string to remove the whitespace from
*
* @return a string with _no_ whitespace.
*/
private static String removeWhitespace(String toCollapse) {
if (toCollapse == null) {
return null;
}
int length = toCollapse.length();
StringBuilder collapsed = new StringBuilder(length);
for (int i = 0; i < length; i++) {
char c = toCollapse.charAt(i);
if (!Character.isWhitespace(c)) {
collapsed.append(c);
}
}
return collapsed.toString();
}
}
