src/AlgorithmIdentifier.js

import * as asn1js from "asn1js";
import { getParametersValue, clearProps } from "pvutils";
//**************************************************************************************
/**
 * Class from RFC5280
 */
export default class AlgorithmIdentifier
{
	//**********************************************************************************
	/**
	 * Constructor for AlgorithmIdentifier class
	 * @param {Object} [parameters={}]
	 * @property {Object} [schema] asn1js parsed value
	 * @property {string} [algorithmId] ObjectIdentifier for algorithm (string representation)
	 */
	constructor(parameters = {})
	{
		//region Internal properties of the object
		/**
		 * @type {string}
		 * @description ObjectIdentifier for algorithm (string representation)
		 */
		this.algorithmId = getParametersValue(parameters, "algorithmId", AlgorithmIdentifier.defaultValues("algorithmId"));

		if("algorithmParams" in parameters)
			/**
			 * @type {Object}
			 * @description Any algorithm parameters
			 */
			this.algorithmParams = getParametersValue(parameters, "algorithmParams", AlgorithmIdentifier.defaultValues("algorithmParams"));
		//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 "algorithmId":
				return "";
			case "algorithmParams":
				return new asn1js.Any();
			default:
				throw new Error(`Invalid member name for AlgorithmIdentifier 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 "algorithmId":
				return (memberValue === "");
			case "algorithmParams":
				return (memberValue instanceof asn1js.Any);
			default:
				throw new Error(`Invalid member name for AlgorithmIdentifier 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 = {})
	{
		//AlgorithmIdentifier  ::=  Sequence  {
		//    algorithm               OBJECT IDENTIFIER,
		//    parameters              ANY DEFINED BY algorithm OPTIONAL  }

		/**
		 * @type {Object}
		 * @property {string} algorithmIdentifier ObjectIdentifier for the algorithm
		 * @property {string} algorithmParams Any algorithm parameters
		 */
		const names = getParametersValue(parameters, "names", {});

		return (new asn1js.Sequence({
			name: (names.blockName || ""),
			optional: (names.optional || false),
			value: [
				new asn1js.ObjectIdentifier({ name: (names.algorithmIdentifier || "") }),
				new asn1js.Any({ name: (names.algorithmParams || ""), optional: true })
			]
		}));
	}
	//**********************************************************************************
	/**
	 * Convert parsed asn1js object into current class
	 * @param {!Object} schema
	 */
	fromSchema(schema)
	{
		//region Clear input data first
		clearProps(schema, [
			"algorithm",
			"params"
		]);
		//endregion
		
		//region Check the schema is valid
		const asn1 = asn1js.compareSchema(schema,
			schema,
			AlgorithmIdentifier.schema({
				names: {
					algorithmIdentifier: "algorithm",
					algorithmParams: "params"
				}
			})
		);

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

		//region Get internal properties from parsed schema
		this.algorithmId = asn1.result.algorithm.valueBlock.toString();
		if("params" in asn1.result)
			this.algorithmParams = asn1.result.params;
		//endregion
	}
	//**********************************************************************************
	/**
	 * Convert current object to asn1js object and set correct values
	 * @returns {Object} asn1js object
	 */
	toSchema()
	{
		//region Create array for output sequence
		const outputArray = [];
		
		outputArray.push(new asn1js.ObjectIdentifier({ value: this.algorithmId }));
		if(("algorithmParams" in this) && ((this.algorithmParams instanceof asn1js.Any) === false))
			outputArray.push(this.algorithmParams);
		//endregion
		
		//region Construct and return new ASN.1 schema for this object
		return (new asn1js.Sequence({
			value: outputArray
		}));
		//endregion
	}
	//**********************************************************************************
	/**
	 * Convertion for the class to JSON object
	 * @returns {Object}
	 */
	toJSON()
	{
		const object = {
			algorithmId: this.algorithmId
		};

		if(("algorithmParams" in this) && ((this.algorithmParams instanceof asn1js.Any) === false))
			object.algorithmParams = this.algorithmParams.toJSON();

		return object;
	}
	//**********************************************************************************
	/**
	 * Check that two "AlgorithmIdentifiers" are equal
	 * @param {AlgorithmIdentifier} algorithmIdentifier
	 * @returns {boolean}
	 */
	isEqual(algorithmIdentifier)
	{
		//region Check input type
		if((algorithmIdentifier instanceof AlgorithmIdentifier) === false)
			return false;
		//endregion

		//region Check "algorithm_id"
		if(this.algorithmId !== algorithmIdentifier.algorithmId)
			return false;
		//endregion

		//region Check "algorithm_params"
		if("algorithmParams" in this)
		{
			if("algorithmParams" in algorithmIdentifier)
				return JSON.stringify(this.algorithmParams) === JSON.stringify(algorithmIdentifier.algorithmParams);

			return false;
		}

		if("algorithmParams" in algorithmIdentifier)
			return false;
		//endregion

		return true;
	}
	//**********************************************************************************
}
//**************************************************************************************