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// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (c) 2015-2025 MariaDB Corporation Ab
'use strict';
const Command = require('./command');
const ServerStatus = require('../const/server-status');
const ColumnDefinition = require('./column-definition');
const Errors = require('../misc/errors');
const fs = require('fs');
const Parse = require('../misc/parse');
const BinaryDecoder = require('./decoder/binary-decoder');
const TextDecoder = require('./decoder/text-decoder');
const OkPacket = require('./class/ok-packet');
const StateChange = require('../const/state-change');
const Collations = require('../const/collations');
// Set of field names that are reserved for internal use
const privateFields = new Set([
'__defineGetter__',
'__defineSetter__',
'__lookupGetter__',
'__lookupSetter__',
'__proto__'
]);
/**
* Handle COM_QUERY / COM_STMT_EXECUTE results
* @see https://mariadb.com/kb/en/library/4-server-response-packets/
*/
class Parser extends Command {
/**
* Create a new Parser instance
*
* @param {Function} resolve - Promise resolve function
* @param {Function} reject - Promise reject function
* @param {Object} connOpts - Connection options
* @param {Object} cmdParam - Command parameters
*/
constructor(resolve, reject, connOpts, cmdParam) {
super(cmdParam, resolve, reject);
this._responseIndex = 0;
this._rows = [];
this.opts = cmdParam.opts ? Object.assign({}, connOpts, cmdParam.opts) : connOpts;
this.sql = cmdParam.sql;
this.initialValues = cmdParam.values;
this.canSkipMeta = false;
}
/**
* Read Query response packet.
* Packet can be:
* - a result-set
* - an ERR_Packet
* - an OK_Packet
* - LOCAL_INFILE Packet
*
* @param {Object} packet - Query response packet
* @param {Object} out - Output writer
* @param {Object} opts - Connection options
* @param {Object} info - Connection info
* @returns {Function|null} Next packet handler or null
*/
readResponsePacket(packet, out, opts, info) {
switch (packet.peek()) {
case 0x00: // OK response
return this.readOKPacket(packet, out, opts, info);
case 0xff: // ERROR response
return this.handleErrorPacket(packet, info);
case 0xfb: // LOCAL INFILE response
return this.readLocalInfile(packet, out, opts, info);
default: // Result set
return this.readResultSet(packet, info);
}
}
/**
* Handle error packet
*
* @param {Object} packet - Error packet
* @param {Object} info - Connection info
* @returns {null} Always returns null
* @private
*/
handleErrorPacket(packet, info) {
// In case of timeout, free accumulated rows
this._columns = null;
const err = packet.readError(info, this.opts.logParam ? this.displaySql() : this.sql, this.cmdParam.stack);
// Force in transaction status, since query will have created a transaction if autocommit is off
// Goal is to avoid unnecessary COMMIT/ROLLBACK
info.status |= ServerStatus.STATUS_IN_TRANS;
return this.throwError(err, info);
}
/**
* Read result-set packets
* @see https://mariadb.com/kb/en/library/resultset/
*
* @param {Object} packet - Column count packet
* @param {Object} info - Connection information
* @returns {Function} Next packet handler
*/
readResultSet(packet, info) {
this._columnCount = packet.readUnsignedLength();
this._rows.push([]);
if (this.canSkipMeta && info.serverPermitSkipMeta && packet.readUInt8() === 0) {
// Command supports skipping meta
// Server permits it
// And tells that no columns follow, using prepare results
return this.handleSkippedMeta(info);
}
this._columns = [];
return (this.onPacketReceive = this.readColumn);
}
/**
* Handle skipped metadata case
*
* @param {Object} info - Connection information
* @returns {Function} Next packet handler
* @private
*/
handleSkippedMeta(info) {
this._columns = this.prepare.columns;
this._columnCount = this._columns.length;
this.emit('fields', this._columns);
this.setParser();
return (this.onPacketReceive = info.eofDeprecated ? this.readResultSetRow : this.readIntermediateEOF);
}
/**
* Read OK_Packet
* @see https://mariadb.com/kb/en/library/ok_packet/
*
* @param {Object} packet - OK_Packet
* @param {Object} out - Output writer
* @param {Object} opts - Connection options
* @param {Object} info - Connection information
* @returns {Function|null} Next packet handler or null
*/
readOKPacket(packet, out, opts, info) {
packet.skip(1); // Skip header
const affectedRows = packet.readUnsignedLength();
// Handle insertId based on options
let insertId = this.processInsertId(packet.readInsertId(), info);
info.status = packet.readUInt16();
const okPacket = new OkPacket(affectedRows, insertId, packet.readUInt16());
let mustRedirect = false;
// Process session state changes if present
if (info.status & ServerStatus.SESSION_STATE_CHANGED) {
mustRedirect = this.processSessionStateChanges(packet, info, opts);
}
// Handle streaming case
if (this.inStream) {
this.handleNewRows(okPacket);
}
// Handle redirection
if (mustRedirect) {
return null; // Redirection is handled asynchronously
}
if (
info.redirectRequest &&
(info.status & ServerStatus.STATUS_IN_TRANS) === 0 &&
(info.status & ServerStatus.MORE_RESULTS_EXISTS) === 0
) {
info.redirect(info.redirectRequest, this.okPacketSuccess.bind(this, okPacket, info));
} else {
this.okPacketSuccess(okPacket, info);
}
return null;
}
/**
* Process insertId based on connection options
*
* @param {BigInt} insertId - Raw insertId from packet
* @param {Object} info - Connection info
* @returns {BigInt|Number|String} Processed insertId
* @private
*/
processInsertId(insertId, info) {
if (this.opts.supportBigNumbers || this.opts.insertIdAsNumber) {
if (this.opts.insertIdAsNumber && this.opts.checkNumberRange && !Number.isSafeInteger(Number(insertId))) {
this.onPacketReceive = info.status & ServerStatus.MORE_RESULTS_EXISTS ? this.readResponsePacket : null;
this.throwUnexpectedError(
`last insert id value ${insertId} can't safely be converted to number`,
false,
info,
'42000',
Errors.ER_PARSING_PRECISION
);
return insertId;
}
if (this.opts.supportBigNumbers && (this.opts.bigNumberStrings || !Number.isSafeInteger(Number(insertId)))) {
return insertId.toString();
} else {
return Number(insertId);
}
}
return insertId;
}
/**
* Process session state changes
*
* @param {Object} packet - Packet containing session state changes
* @param {Object} info - Connection information
* @param {Object} opts - Connection options
* @returns {Boolean} True if redirection is needed
* @private
*/
processSessionStateChanges(packet, info, opts) {
let mustRedirect = false;
packet.skipLengthCodedNumber();
while (packet.remaining()) {
const len = packet.readUnsignedLength();
if (len > 0) {
const subPacket = packet.subPacketLengthEncoded(len);
while (subPacket.remaining()) {
const type = subPacket.readUInt8();
switch (type) {
case StateChange.SESSION_TRACK_SYSTEM_VARIABLES:
mustRedirect = this.processSystemVariables(subPacket, info, opts) || mustRedirect;
break;
case StateChange.SESSION_TRACK_SCHEMA:
info.database = this.readSchemaChange(subPacket);
break;
}
}
}
}
return mustRedirect;
}
/**
* Process system variables changes
*
* @param {Object} subPacket - Packet containing system variables
* @param {Object} info - Connection information
* @param {Object} opts - Connection options
* @returns {Boolean} True if redirection is needed
* @private
*/
processSystemVariables(subPacket, info, opts) {
let mustRedirect = false;
let subSubPacket;
do {
subSubPacket = subPacket.subPacketLengthEncoded(subPacket.readUnsignedLength());
const variable = subSubPacket.readStringLengthEncoded();
const value = subSubPacket.readStringLengthEncoded();
switch (variable) {
case 'character_set_client':
info.collation = Collations.fromCharset(value);
if (info.collation === undefined) {
this.throwError(new Error(`unknown charset: '${value}'`), info);
return false;
}
opts.emit('collation', info.collation);
break;
case 'redirect_url':
if (value !== '') {
mustRedirect = true;
info.redirect(value, this.okPacketSuccess.bind(this, this.okPacket, info));
}
break;
case 'connection_id':
info.threadId = parseInt(value);
break;
}
} while (subSubPacket.remaining() > 0);
return mustRedirect;
}
/**
* Read schema change from packet
*
* @param {Object} subPacket - Packet containing schema change
* @returns {String} New schema name
* @private
*/
readSchemaChange(subPacket) {
const subSubPacket = subPacket.subPacketLengthEncoded(subPacket.readUnsignedLength());
return subSubPacket.readStringLengthEncoded();
}
/**
* Handle OK packet success
*
* @param {Object} okPacket - OK packet
* @param {Object} info - Connection information
*/
okPacketSuccess(okPacket, info) {
if (this._responseIndex === 0) {
// Fast path for standard single result
if (info.status & ServerStatus.MORE_RESULTS_EXISTS) {
this._rows.push(okPacket);
this._responseIndex++;
return (this.onPacketReceive = this.readResponsePacket);
}
return this.success(this.opts.metaAsArray ? [okPacket, []] : okPacket);
}
this._rows.push(okPacket);
if (info.status & ServerStatus.MORE_RESULTS_EXISTS) {
this._responseIndex++;
return (this.onPacketReceive = this.readResponsePacket);
}
if (this.opts.metaAsArray) {
if (!this._meta) {
this._meta = new Array(this._responseIndex);
}
this._meta[this._responseIndex] = null;
this.success([this._rows, this._meta]);
} else {
this.success(this._rows);
}
}
/**
* Complete query with success
*
* @param {*} val - Result value
*/
success(val) {
this.successEnd(val);
this._columns = null;
this._rows = [];
}
/**
* Read column information metadata
* @see https://mariadb.com/kb/en/library/resultset/#column-definition-packet
*
* @param {Object} packet - Column definition packet
* @param {Object} out - Output writer
* @param {Object} opts - Connection options
* @param {Object} info - Connection information
*/
readColumn(packet, out, opts, info) {
this._columns.push(new ColumnDefinition(packet, info, this.opts.rowsAsArray));
// Last column
if (this._columns.length === this._columnCount) {
this.setParser();
if (this.canSkipMeta && info.serverPermitSkipMeta && this.prepare != null) {
// Server can skip meta, but have force sending it.
// Metadata have changed, updating prepare result accordingly
if (this._responseIndex === 0) this.prepare.columns = this._columns;
}
this.emit('fields', this._columns);
this.onPacketReceive = info.eofDeprecated ? this.readResultSetRow : this.readIntermediateEOF;
}
}
/**
* Set up row parsers based on column information
*/
setParser() {
this._parseFunction = new Array(this._columnCount);
if (this.opts.typeCast) {
for (let i = 0; i < this._columnCount; i++) {
this._parseFunction[i] = this.readCastValue.bind(this, this._columns[i]);
}
} else {
const dataParser = this.binary ? BinaryDecoder.parser : TextDecoder.parser;
for (let i = 0; i < this._columnCount; i++) {
this._parseFunction[i] = dataParser(this._columns[i], this.opts);
}
}
if (this.opts.rowsAsArray) {
this.parseRow = this.parseRowAsArray;
} else {
this.tableHeader = new Array(this._columnCount);
this.parseRow = this.binary ? this.parseRowStdBinary : this.parseRowStdText;
if (this.opts.nestTables) {
this.configureNestedTables();
} else {
for (let i = 0; i < this._columnCount; i++) {
this.tableHeader[i] = this._columns[i].name();
}
this.checkDuplicates();
}
}
}
/**
* Configure nested tables format
* @private
*/
configureNestedTables() {
if (typeof this.opts.nestTables === 'string') {
for (let i = 0; i < this._columnCount; i++) {
this.tableHeader[i] = this._columns[i].table() + this.opts.nestTables + this._columns[i].name();
}
this.checkDuplicates();
} else if (this.opts.nestTables === true) {
this.parseRow = this.parseRowNested;
for (let i = 0; i < this._columnCount; i++) {
this.tableHeader[i] = [this._columns[i].table(), this._columns[i].name()];
}
this.checkNestTablesDuplicatesAndPrivateFields();
}
}
/**
* Check for duplicate column names
*/
checkDuplicates() {
if (this.opts.checkDuplicate) {
for (let i = 0; i < this._columnCount; i++) {
if (this.tableHeader.indexOf(this.tableHeader[i], i + 1) > 0) {
const dupes = this.tableHeader.reduce(
(acc, v, i, arr) => (arr.indexOf(v) !== i && acc.indexOf(v) === -1 ? acc.concat(v) : acc),
[]
);
this.throwUnexpectedError(
`Error in results, duplicate field name \`${dupes[0]}\`.\n(see option \`checkDuplicate\`)`,
false,
null,
'42000',
Errors.ER_DUPLICATE_FIELD
);
}
}
}
}
/**
* Check for duplicates and private fields in nested tables
*/
checkNestTablesDuplicatesAndPrivateFields() {
if (this.opts.checkDuplicate) {
for (let i = 0; i < this._columnCount; i++) {
for (let j = 0; j < i; j++) {
if (this.tableHeader[j][0] === this.tableHeader[i][0] && this.tableHeader[j][1] === this.tableHeader[i][1]) {
this.throwUnexpectedError(
`Error in results, duplicate field name \`${this.tableHeader[i][0]}\`.\`${this.tableHeader[i][1]}\`\n(see option \`checkDuplicate\`)`,
false,
null,
'42000',
Errors.ER_DUPLICATE_FIELD
);
}
}
}
}
for (let i = 0; i < this._columnCount; i++) {
if (privateFields.has(this.tableHeader[i][0])) {
this.throwUnexpectedError(
`Use of \`${this.tableHeader[i][0]}\` is not permitted with option \`nestTables\``,
false,
null,
'42000',
Errors.ER_PRIVATE_FIELDS_USE
);
// Continue parsing results to keep connection state
// but without assigning possible dangerous value
this.parseRow = () => {
return {};
};
}
}
}
/**
* Read intermediate EOF
* Only for server before MariaDB 10.2 / MySQL 5.7 that doesn't have CLIENT_DEPRECATE_EOF capability
* @see https://mariadb.com/kb/en/library/eof_packet/
*
* @param {Object} packet - EOF Packet
* @param {Object} out - Output writer
* @param {Object} opts - Connection options
* @param {Object} info - Connection information
* @returns {Function|null} Next packet handler or null
*/
readIntermediateEOF(packet, out, opts, info) {
if (packet.peek() !== 0xfe) {
return this.throwNewError('Error in protocol, expected EOF packet', true, info, '42000', Errors.ER_EOF_EXPECTED);
}
// Before MySQL 5.7.5, last EOF doesn't contain the good flag SERVER_MORE_RESULTS_EXISTS
// for OUT parameters. It must be checked here
// (5.7.5 does have the CLIENT_DEPRECATE_EOF capability, so this packet is not even sent)
packet.skip(3);
info.status = packet.readUInt16();
this.isOutParameter = info.status & ServerStatus.PS_OUT_PARAMS;
return (this.onPacketReceive = this.readResultSetRow);
}
/**
* Add new rows to the result set
*
* @param {Object} row - Row data
*/
handleNewRows(row) {
this._rows[this._responseIndex].push(row);
}
/**
* Check if packet is result-set end = EOF of OK_Packet with EOF header according to CLIENT_DEPRECATE_EOF capability
* or a result-set row
*
* @param packet current packet
* @param out output writer
* @param opts connection options
* @param info connection information
* @returns {*}
*/
readResultSetRow(packet, out, opts, info) {
if (packet.peek() >= 0xfe) {
if (packet.peek() === 0xff) {
//force in transaction status, since query will have created a transaction if autocommit is off
//goal is to avoid unnecessary COMMIT/ROLLBACK.
info.status |= ServerStatus.STATUS_IN_TRANS;
return this.throwError(
packet.readError(info, this.opts.logParam ? this.displaySql() : this.sql, this.cmdParam.err),
info
);
}
if ((!info.eofDeprecated && packet.length() < 13) || (info.eofDeprecated && packet.length() < 0xffffff)) {
if (!info.eofDeprecated) {
packet.skip(3);
info.status = packet.readUInt16();
} else {
packet.skip(1); //skip header
packet.skipLengthCodedNumber(); //skip update count
packet.skipLengthCodedNumber(); //skip insert id
info.status = packet.readUInt16();
}
if (
info.redirectRequest &&
(info.status & ServerStatus.STATUS_IN_TRANS) === 0 &&
(info.status & ServerStatus.MORE_RESULTS_EXISTS) === 0
) {
info.redirect(info.redirectRequest, this.resultSetEndingPacketResult.bind(this, info));
} else {
this.resultSetEndingPacketResult(info);
}
return;
}
}
this.handleNewRows(this.parseRow(packet));
}
resultSetEndingPacketResult(info) {
if (this.opts.metaAsArray) {
//return promise object as array :
// example for SELECT 1 =>
// [
// [ {"1": 1} ], //rows
// [ColumnDefinition] //meta
// ]
if (info.status & ServerStatus.MORE_RESULTS_EXISTS || this.isOutParameter) {
if (!this._meta) this._meta = [];
this._meta[this._responseIndex] = this._columns;
this._responseIndex++;
return (this.onPacketReceive = this.readResponsePacket);
}
if (this._responseIndex === 0) {
this.success([this._rows[0], this._columns]);
} else {
if (!this._meta) this._meta = [];
this._meta[this._responseIndex] = this._columns;
this.success([this._rows, this._meta]);
}
} else {
//return promise object as rows that have meta property :
// example for SELECT 1 =>
// [
// {"1": 1},
// meta: [ColumnDefinition]
// ]
Object.defineProperty(this._rows[this._responseIndex], 'meta', {
value: this._columns,
writable: true,
enumerable: this.opts.metaEnumerable
});
if (info.status & ServerStatus.MORE_RESULTS_EXISTS || this.isOutParameter) {
this._responseIndex++;
return (this.onPacketReceive = this.readResponsePacket);
}
this.success(this._responseIndex === 0 ? this._rows[0] : this._rows);
}
}
/**
* Display current SQL with parameters (truncated if too big)
*
* @returns {string}
*/
displaySql() {
if (this.opts && this.initialValues) {
if (this.sql.length > this.opts.debugLen) {
return this.sql.substring(0, this.opts.debugLen) + '...';
}
let sqlMsg = this.sql + ' - parameters:';
return Parser.logParameters(this.opts, sqlMsg, this.initialValues);
}
if (this.sql.length > this.opts.debugLen) {
return this.sql.substring(0, this.opts.debugLen) + '... - parameters:[]';
}
return this.sql + ' - parameters:[]';
}
static logParameters(opts, sqlMsg, values) {
if (opts.namedPlaceholders) {
sqlMsg += '{';
let first = true;
for (let key in values) {
if (first) {
first = false;
} else {
sqlMsg += ',';
}
sqlMsg += "'" + key + "':";
let param = values[key];
sqlMsg = Parser.logParam(sqlMsg, param);
if (sqlMsg.length > opts.debugLen) {
return sqlMsg.substring(0, opts.debugLen) + '...';
}
}
sqlMsg += '}';
} else {
sqlMsg += '[';
if (Array.isArray(values)) {
for (let i = 0; i < values.length; i++) {
if (i !== 0) sqlMsg += ',';
let param = values[i];
sqlMsg = Parser.logParam(sqlMsg, param);
if (sqlMsg.length > opts.debugLen) {
return sqlMsg.substring(0, opts.debugLen) + '...';
}
}
} else {
sqlMsg = Parser.logParam(sqlMsg, values);
if (sqlMsg.length > opts.debugLen) {
return sqlMsg.substring(0, opts.debugLen) + '...';
}
}
sqlMsg += ']';
}
return sqlMsg;
}
parseRowAsArray(packet) {
const row = new Array(this._columnCount);
const nullBitMap = this.binary ? BinaryDecoder.newRow(packet, this._columns) : null;
for (let i = 0; i < this._columnCount; i++) {
row[i] = this._parseFunction[i](packet, this.opts, this.unexpectedError, nullBitMap, i);
}
return row;
}
parseRowNested(packet) {
const row = {};
const nullBitMap = this.binary ? BinaryDecoder.newRow(packet, this._columns) : null;
for (let i = 0; i < this._columnCount; i++) {
if (!row[this.tableHeader[i][0]]) row[this.tableHeader[i][0]] = {};
row[this.tableHeader[i][0]][this.tableHeader[i][1]] = this._parseFunction[i](
packet,
this.opts,
this.unexpectedError,
nullBitMap,
i
);
}
return row;
}
parseRowStdText(packet) {
const row = {};
for (let i = 0; i < this._columnCount; i++) {
row[this.tableHeader[i]] = this._parseFunction[i](packet, this.opts, this.unexpectedError);
}
return row;
}
parseRowStdBinary(packet) {
const nullBitMap = BinaryDecoder.newRow(packet, this._columns);
const row = {};
for (let i = 0; i < this._columnCount; i++) {
row[this.tableHeader[i]] = this._parseFunction[i](packet, this.opts, this.unexpectedError, nullBitMap, i);
}
return row;
}
readCastValue(column, packet, opts, unexpectedError, nullBitmap, index) {
if (this.binary) {
BinaryDecoder.castWrapper(column, packet, opts, nullBitmap, index);
} else {
TextDecoder.castWrapper(column, packet, opts, nullBitmap, index);
}
const dataParser = this.binary ? BinaryDecoder.parser : TextDecoder.parser;
return opts.typeCast(column, dataParser(column, opts).bind(null, packet, opts, unexpectedError, nullBitmap, index));
}
readLocalInfile(packet, out, opts, info) {
packet.skip(1); //skip header
out.startPacket(this);
const fileName = packet.readStringRemaining();
if (!Parse.validateFileName(this.sql, this.initialValues, fileName)) {
out.writeEmptyPacket();
const error = Errors.createError(
"LOCAL INFILE wrong filename. '" +
fileName +
"' doesn't correspond to query " +
this.sql +
'. Query cancelled. Check for malicious server / proxy',
Errors.ER_LOCAL_INFILE_WRONG_FILENAME,
info,
'HY000',
this.sql
);
process.nextTick(this.reject, error);
this.reject = null;
this.resolve = null;
return (this.onPacketReceive = this.readResponsePacket);
}
// this.sequenceNo = 2;
// this.compressSequenceNo = 2;
let stream;
try {
stream = this.opts.infileStreamFactory ? this.opts.infileStreamFactory(fileName) : fs.createReadStream(fileName);
} catch (e) {
out.writeEmptyPacket();
const error = Errors.createError(
`LOCAL INFILE infileStreamFactory failed`,
Errors.ER_LOCAL_INFILE_NOT_READABLE,
info,
'22000',
this.opts.logParam ? this.displaySql() : this.sql
);
error.cause = e;
process.nextTick(this.reject, error);
this.reject = null;
this.resolve = null;
return (this.onPacketReceive = this.readResponsePacket);
}
stream.on(
'error',
function (err) {
out.writeEmptyPacket();
const error = Errors.createError(
`LOCAL INFILE command failed: ${err.message}`,
Errors.ER_LOCAL_INFILE_NOT_READABLE,
info,
'22000',
this.sql
);
process.nextTick(this.reject, error);
this.reject = null;
this.resolve = null;
}.bind(this)
);
stream.on('data', (chunk) => {
out.writeBuffer(chunk, 0, chunk.length);
});
stream.on('end', () => {
if (!out.isEmpty()) {
out.flushBuffer(false);
}
out.writeEmptyPacket();
});
this.onPacketReceive = this.readResponsePacket;
}
static logParam(sqlMsg, param) {
if (param == null) {
sqlMsg += param === undefined ? 'undefined' : 'null';
} else {
switch (param.constructor.name) {
case 'Buffer':
sqlMsg += '0x' + param.toString('hex', 0, Math.min(1024, param.length)) + '';
break;
case 'String':
sqlMsg += "'" + param + "'";
break;
case 'Date':
sqlMsg += getStringDate(param);
break;
case 'Object':
sqlMsg += JSON.stringify(param);
break;
default:
sqlMsg += param.toString();
}
}
return sqlMsg;
}
}
function getStringDate(param) {
return (
"'" +
('00' + (param.getMonth() + 1)).slice(-2) +
'/' +
('00' + param.getDate()).slice(-2) +
'/' +
param.getFullYear() +
' ' +
('00' + param.getHours()).slice(-2) +
':' +
('00' + param.getMinutes()).slice(-2) +
':' +
('00' + param.getSeconds()).slice(-2) +
'.' +
('000' + param.getMilliseconds()).slice(-3) +
"'"
);
}
module.exports = Parser;