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79 lines
2.0 KiB
79 lines
2.0 KiB
3 months ago
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'use strict';
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const MongooseBuffer = require('../types/buffer');
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const UUID_FORMAT = /[0-9a-f]{8}-[0-9a-f]{4}-[0-9][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}/i;
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const Binary = MongooseBuffer.Binary;
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module.exports = function castUUID(value) {
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if (value == null) {
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return value;
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}
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function newBuffer(initbuff) {
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const buff = new MongooseBuffer(initbuff);
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buff._subtype = 4;
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return buff;
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}
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if (typeof value === 'string') {
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if (UUID_FORMAT.test(value)) {
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return stringToBinary(value);
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} else {
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throw new Error(`"${value}" is not a valid UUID string`);
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}
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}
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if (Buffer.isBuffer(value)) {
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return newBuffer(value);
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}
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if (value instanceof Binary) {
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return newBuffer(value.value(true));
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}
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// Re: gh-647 and gh-3030, we're ok with casting using `toString()`
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// **unless** its the default Object.toString, because "[object Object]"
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// doesn't really qualify as useful data
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if (value.toString && value.toString !== Object.prototype.toString) {
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if (UUID_FORMAT.test(value.toString())) {
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return stringToBinary(value.toString());
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}
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}
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throw new Error(`"${value}" cannot be casted to a UUID`);
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};
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module.exports.UUID_FORMAT = UUID_FORMAT;
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/**
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* Helper function to convert the input hex-string to a buffer
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* @param {String} hex The hex string to convert
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* @returns {Buffer} The hex as buffer
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* @api private
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*/
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function hex2buffer(hex) {
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// use buffer built-in function to convert from hex-string to buffer
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const buff = hex != null && Buffer.from(hex, 'hex');
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return buff;
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}
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/**
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* Convert a String to Binary
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* @param {String} uuidStr The value to process
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* @returns {MongooseBuffer} The binary to store
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* @api private
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*/
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function stringToBinary(uuidStr) {
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// Protect against undefined & throwing err
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if (typeof uuidStr !== 'string') uuidStr = '';
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const hex = uuidStr.replace(/[{}-]/g, ''); // remove extra characters
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const bytes = hex2buffer(hex);
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const buff = new MongooseBuffer(bytes);
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buff._subtype = 4;
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return buff;
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}
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