src/RelativeDistinguishedNames.js

import * as asn1js from "asn1js";
import { getParametersValue, isEqualBuffer, clearProps } from "pvutils";
import AttributeTypeAndValue from "./AttributeTypeAndValue.js";
//**************************************************************************************
/**
 * Class from RFC5280
 */
export default class RelativeDistinguishedNames
{
	//**********************************************************************************
	/**
	 * Constructor for RelativeDistinguishedNames class
	 * @param {Object} [parameters={}]
	 * @property {Object} [schema] asn1js parsed value
	 * @property {Array.<AttributeTypeAndValue>} [typesAndValues] Array of "type and value" objects
	 * @property {ArrayBuffer} [valueBeforeDecode] Value of the RDN before decoding from schema
	 */
	constructor(parameters = {})
	{
		//region Internal properties of the object
		/**
		 * @type {Array.<AttributeTypeAndValue>}
		 * @description Array of "type and value" objects
		 */
		this.typesAndValues = getParametersValue(parameters, "typesAndValues", RelativeDistinguishedNames.defaultValues("typesAndValues"));
		/**
		 * @type {ArrayBuffer}
		 * @description Value of the RDN before decoding from schema
		 */
		this.valueBeforeDecode = getParametersValue(parameters, "valueBeforeDecode", RelativeDistinguishedNames.defaultValues("valueBeforeDecode"));
		//endregion

		//region If input argument array contains "schema" for this object
		if("schema" in parameters)
			this.fromSchema(parameters.schema);
		//endregion
	}
	//**********************************************************************************
	/**
	 * Return default values for all class members
	 * @param {string} memberName String name for a class member
	 */
	static defaultValues(memberName)
	{
		switch(memberName)
		{
			case "typesAndValues":
				return [];
			case "valueBeforeDecode":
				return new ArrayBuffer(0);
			default:
				throw new Error(`Invalid member name for RelativeDistinguishedNames class: ${memberName}`);
		}
	}
	//**********************************************************************************
	/**
	 * Compare values with default values for all class members
	 * @param {string} memberName String name for a class member
	 * @param {*} memberValue Value to compare with default value
	 */
	static compareWithDefault(memberName, memberValue)
	{
		switch(memberName)
		{
			case "typesAndValues":
				return (memberValue.length === 0);
			case "valueBeforeDecode":
				return (memberValue.byteLength === 0);
			default:
				throw new Error(`Invalid member name for RelativeDistinguishedNames class: ${memberName}`);
		}
	}
	//**********************************************************************************
	/**
	 * Return value of asn1js schema for current class
	 * @param {Object} parameters Input parameters for the schema
	 * @returns {Object} asn1js schema object
	 */
	static schema(parameters = {})
	{
		//RDNSequence ::= Sequence OF RelativeDistinguishedName
		//
		//RelativeDistinguishedName ::=
		//SET SIZE (1..MAX) OF AttributeTypeAndValue

		/**
		 * @type {Object}
		 * @property {string} [blockName] Name for entire block
		 * @property {string} [repeatedSequence] Name for "repeatedSequence" block
		 * @property {string} [repeatedSet] Name for "repeatedSet" block
		 * @property {string} [typeAndValue] Name for "typeAndValue" block
		 */
		const names = getParametersValue(parameters, "names", {});

		return (new asn1js.Sequence({
			name: (names.blockName || ""),
			value: [
				new asn1js.Repeated({
					name: (names.repeatedSequence || ""),
					value: new asn1js.Set({
						value: [
							new asn1js.Repeated({
								name: (names.repeatedSet || ""),
								value: AttributeTypeAndValue.schema(names.typeAndValue || {})
							})
						]
					})
				})
			]
		}));
	}
	//**********************************************************************************
	/**
	 * Convert parsed asn1js object into current class
	 * @param {!Object} schema
	 */
	fromSchema(schema)
	{
		//region Clear input data first
		clearProps(schema, [
			"RDN",
			"typesAndValues"
		]);
		//endregion
		
		//region Check the schema is valid
		const asn1 = asn1js.compareSchema(schema,
			schema,
			RelativeDistinguishedNames.schema({
				names: {
					blockName: "RDN",
					repeatedSet: "typesAndValues"
				}
			})
		);

		if(asn1.verified === false)
			throw new Error("Object's schema was not verified against input data for RelativeDistinguishedNames");
		//endregion

		//region Get internal properties from parsed schema
		if("typesAndValues" in asn1.result) // Could be a case when there is no "types and values"
			this.typesAndValues = Array.from(asn1.result.typesAndValues, element => new AttributeTypeAndValue({ schema: element }));

		// noinspection JSUnresolvedVariable
		this.valueBeforeDecode = asn1.result.RDN.valueBeforeDecode;
		//endregion
	}
	//**********************************************************************************
	/**
	 * Convert current object to asn1js object and set correct values
	 * @returns {Object} asn1js object
	 */
	toSchema()
	{
		//region Decode stored TBS value
		if(this.valueBeforeDecode.byteLength === 0) // No stored encoded array, create "from scratch"
		{
			return (new asn1js.Sequence({
				value: [new asn1js.Set({
					value: Array.from(this.typesAndValues, element => element.toSchema())
				})]
			}));
		}

		const asn1 = asn1js.fromBER(this.valueBeforeDecode);
		//endregion

		//region Construct and return new ASN.1 schema for this object
		return asn1.result;
		//endregion
	}
	//**********************************************************************************
	/**
	 * Convertion for the class to JSON object
	 * @returns {Object}
	 */
	toJSON()
	{
		return {
			typesAndValues: Array.from(this.typesAndValues, element => element.toJSON())
		};
	}
	//**********************************************************************************
	/**
	 * Compare two RDN values, or RDN with ArrayBuffer value
	 * @param {(RelativeDistinguishedNames|ArrayBuffer)} compareTo The value compare to current
	 * @returns {boolean}
	 */
	isEqual(compareTo)
	{
		if(compareTo instanceof RelativeDistinguishedNames)
		{
			if(this.typesAndValues.length !== compareTo.typesAndValues.length)
				return false;

			for(const [index, typeAndValue] of this.typesAndValues.entries())
			{
				if(typeAndValue.isEqual(compareTo.typesAndValues[index]) === false)
					return false;
			}

			return true;
		}

		if(compareTo instanceof ArrayBuffer)
			return isEqualBuffer(this.valueBeforeDecode, compareTo);

		return false;
	}
	//**********************************************************************************
}
//**************************************************************************************