handshake_response.js
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'use strict';
const ClientConstants = require('../constants/client.js');
const CharsetToEncoding = require('../constants/charset_encodings.js');
const Packet = require('../packets/packet.js');
const auth41 = require('../auth_41.js');
class HandshakeResponse {
constructor(handshake) {
this.user = handshake.user || '';
this.database = handshake.database || '';
this.password = handshake.password || '';
this.passwordSha1 = handshake.passwordSha1;
this.authPluginData1 = handshake.authPluginData1;
this.authPluginData2 = handshake.authPluginData2;
this.compress = handshake.compress;
this.clientFlags = handshake.flags;
// TODO: pre-4.1 auth support
let authToken;
if (this.passwordSha1) {
authToken = auth41.calculateTokenFromPasswordSha(
this.passwordSha1,
this.authPluginData1,
this.authPluginData2
);
} else {
authToken = auth41.calculateToken(
this.password,
this.authPluginData1,
this.authPluginData2
);
}
this.authToken = authToken;
this.charsetNumber = handshake.charsetNumber;
this.encoding = CharsetToEncoding[handshake.charsetNumber];
this.connectAttributes = handshake.connectAttributes;
}
serializeResponse(buffer) {
const isSet = flag => this.clientFlags & ClientConstants[flag];
const packet = new Packet(0, buffer, 0, buffer.length);
packet.offset = 4;
packet.writeInt32(this.clientFlags);
packet.writeInt32(0); // max packet size. todo: move to config
packet.writeInt8(this.charsetNumber);
packet.skip(23);
const encoding = this.encoding;
packet.writeNullTerminatedString(this.user, encoding);
let k;
if (isSet('PLUGIN_AUTH_LENENC_CLIENT_DATA')) {
packet.writeLengthCodedNumber(this.authToken.length);
packet.writeBuffer(this.authToken);
} else if (isSet('SECURE_CONNECTION')) {
packet.writeInt8(this.authToken.length);
packet.writeBuffer(this.authToken);
} else {
packet.writeBuffer(this.authToken);
packet.writeInt8(0);
}
if (isSet('CONNECT_WITH_DB')) {
packet.writeNullTerminatedString(this.database, encoding);
}
if (isSet('PLUGIN_AUTH')) {
// TODO: pass from config
packet.writeNullTerminatedString('mysql_native_password', 'latin1');
}
if (isSet('CONNECT_ATTRS')) {
const connectAttributes = this.connectAttributes || {};
const attrNames = Object.keys(connectAttributes);
let keysLength = 0;
for (k = 0; k < attrNames.length; ++k) {
keysLength += Packet.lengthCodedStringLength(attrNames[k], encoding);
keysLength += Packet.lengthCodedStringLength(
connectAttributes[attrNames[k]],
encoding
);
}
packet.writeLengthCodedNumber(keysLength);
for (k = 0; k < attrNames.length; ++k) {
packet.writeLengthCodedString(attrNames[k], encoding);
packet.writeLengthCodedString(
connectAttributes[attrNames[k]],
encoding
);
}
}
return packet;
}
toPacket() {
if (typeof this.user != 'string') {
throw new Error('"user" connection config property must be a string');
}
if (typeof this.database != 'string') {
throw new Error('"database" connection config property must be a string');
}
// dry run: calculate resulting packet length
const p = this.serializeResponse(Packet.MockBuffer());
return this.serializeResponse(Buffer.alloc(p.offset));
}
static fromPacket(packet) {
const args = {};
args.clientFlags = packet.readInt32();
function isSet(flag) {
return args.clientFlags & ClientConstants[flag];
}
args.maxPacketSize = packet.readInt32();
args.charsetNumber = packet.readInt8();
const encoding = CharsetToEncoding[args.charsetNumber];
args.encoding = encoding;
packet.skip(23);
args.user = packet.readNullTerminatedString(encoding);
let authTokenLength;
if (isSet('PLUGIN_AUTH_LENENC_CLIENT_DATA')) {
authTokenLength = packet.readLengthCodedNumber(encoding);
args.authToken = packet.readBuffer(authTokenLength);
} else if (isSet('SECURE_CONNECTION')) {
authTokenLength = packet.readInt8();
args.authToken = packet.readBuffer(authTokenLength);
} else {
args.authToken = packet.readNullTerminatedString(encoding);
}
if (isSet('CONNECT_WITH_DB')) {
args.database = packet.readNullTerminatedString(encoding);
}
if (isSet('PLUGIN_AUTH')) {
args.authPluginName = packet.readNullTerminatedString(encoding);
}
if (isSet('CONNECT_ATTRS')) {
const keysLength = packet.readLengthCodedNumber(encoding);
const keysEnd = packet.offset + keysLength;
const attrs = {};
while (packet.offset < keysEnd) {
attrs[
packet.readLengthCodedString(encoding)
] = packet.readLengthCodedString(encoding);
}
args.connectAttributes = attrs;
}
return args;
}
}
module.exports = HandshakeResponse;