98 lines
3.2 KiB
JavaScript
98 lines
3.2 KiB
JavaScript
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'use strict';
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const CommandCode = require('../constants/commands.js');
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const ClientConstants = require('../constants/client.js');
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const Packet = require('../packets/packet.js');
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const auth41 = require('../auth_41.js');
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const CharsetToEncoding = require('../constants/charset_encodings.js');
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// https://dev.mysql.com/doc/internals/en/com-change-user.html#packet-COM_CHANGE_USER
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class ChangeUser {
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constructor(opts) {
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this.flags = opts.flags;
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this.user = opts.user || '';
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this.database = opts.database || '';
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this.password = opts.password || '';
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this.passwordSha1 = opts.passwordSha1;
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this.authPluginData1 = opts.authPluginData1;
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this.authPluginData2 = opts.authPluginData2;
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this.connectAttributes = opts.connectAttrinutes || {};
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let authToken;
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if (this.passwordSha1) {
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authToken = auth41.calculateTokenFromPasswordSha(
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this.passwordSha1,
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this.authPluginData1,
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this.authPluginData2
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);
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} else {
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authToken = auth41.calculateToken(
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this.password,
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this.authPluginData1,
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this.authPluginData2
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);
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}
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this.authToken = authToken;
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this.charsetNumber = opts.charsetNumber;
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}
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// TODO
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// ChangeUser.fromPacket = function(packet)
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// };
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serializeToBuffer(buffer) {
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const isSet = (flag) => this.flags & ClientConstants[flag];
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const packet = new Packet(0, buffer, 0, buffer.length);
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packet.offset = 4;
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const encoding = CharsetToEncoding[this.charsetNumber];
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packet.writeInt8(CommandCode.CHANGE_USER);
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packet.writeNullTerminatedString(this.user, encoding);
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if (isSet('SECURE_CONNECTION')) {
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packet.writeInt8(this.authToken.length);
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packet.writeBuffer(this.authToken);
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} else {
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packet.writeBuffer(this.authToken);
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packet.writeInt8(0);
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}
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packet.writeNullTerminatedString(this.database, encoding);
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packet.writeInt16(this.charsetNumber);
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if (isSet('PLUGIN_AUTH')) {
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// TODO: read this from parameters
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packet.writeNullTerminatedString('mysql_native_password', 'latin1');
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}
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if (isSet('CONNECT_ATTRS')) {
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const connectAttributes = this.connectAttributes;
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const attrNames = Object.keys(connectAttributes);
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let keysLength = 0;
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for (let k = 0; k < attrNames.length; ++k) {
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keysLength += Packet.lengthCodedStringLength(attrNames[k], encoding);
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keysLength += Packet.lengthCodedStringLength(
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connectAttributes[attrNames[k]],
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encoding
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);
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}
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packet.writeLengthCodedNumber(keysLength);
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for (let k = 0; k < attrNames.length; ++k) {
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packet.writeLengthCodedString(attrNames[k], encoding);
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packet.writeLengthCodedString(
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connectAttributes[attrNames[k]],
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encoding
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);
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}
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}
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return packet;
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}
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toPacket() {
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if (typeof this.user !== 'string') {
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throw new Error('"user" connection config property must be a string');
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}
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if (typeof this.database !== 'string') {
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throw new Error('"database" connection config property must be a string');
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}
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// dry run: calculate resulting packet length
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const p = this.serializeToBuffer(Packet.MockBuffer());
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return this.serializeToBuffer(Buffer.allocUnsafe(p.offset));
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}
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}
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module.exports = ChangeUser;
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