src/AttributeTypeAndValue.js

import * as asn1js from "asn1js";
import { getParametersValue, isEqualBuffer, clearProps } from "pvutils";
import { stringPrep } from "./common.js";
//**************************************************************************************
/**
 * Class from RFC5280
 */
export default class AttributeTypeAndValue
{
	//**********************************************************************************
	/**
	 * Constructor for AttributeTypeAndValue class
	 * @param {Object} [parameters={}]
	 * @property {Object} [schema] asn1js parsed value
	 */
	constructor(parameters = {})
	{
		//region Internal properties of the object
		/**
		 * @type {string}
		 * @description type
		 */
		this.type = getParametersValue(parameters, "type", AttributeTypeAndValue.defaultValues("type"));
		/**
		 * @type {Object}
		 * @description Value of the AttributeTypeAndValue class
		 */
		this.value = getParametersValue(parameters, "value", AttributeTypeAndValue.defaultValues("value"));
		//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 "type":
				return "";
			case "value":
				return {};
			default:
				throw new Error(`Invalid member name for AttributeTypeAndValue 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 = {})
	{
		//AttributeTypeAndValue ::= Sequence {
		//    type     AttributeType,
		//    value    AttributeValue }
		//
		//AttributeType ::= OBJECT IDENTIFIER
		//
		//AttributeValue ::= ANY -- DEFINED BY AttributeType
 
		/**
		 * @type {Object}
		 * @property {string} [blockName] Name for entire block
		 * @property {string} [type] Name for "type" element
		 * @property {string} [value] Name for "value" element
		 */
		const names = getParametersValue(parameters, "names", {});
 
		return (new asn1js.Sequence({
			name: (names.blockName || ""),
			value: [
				new asn1js.ObjectIdentifier({ name: (names.type || "") }),
				new asn1js.Any({ name: (names.value || "") })
			]
		}));
	}
	//**********************************************************************************
	/**
	 * Convert parsed asn1js object into current class
	 * @param {!Object} schema
	 */
	fromSchema(schema)
	{
		//region Clear input data first
		clearProps(schema, [
			"type",
			"typeValue"
		]);
		//endregion
		
		//region Check the schema is valid
		const asn1 = asn1js.compareSchema(schema,
			schema,
			AttributeTypeAndValue.schema({
				names: {
					type: "type",
					value: "typeValue"
				}
			})
		);
 
		if(asn1.verified === false)
			throw new Error("Object's schema was not verified against input data for AttributeTypeAndValue");
		//endregion
 
		//region Get internal properties from parsed schema
		this.type = asn1.result.type.valueBlock.toString();
		// noinspection JSUnresolvedVariable
		this.value = asn1.result.typeValue;
		//endregion
	}
	//**********************************************************************************
	/**
	 * Convert current object to asn1js object and set correct values
	 * @returns {Object} asn1js object
	 */
	toSchema()
	{
		//region Construct and return new ASN.1 schema for this object
		return (new asn1js.Sequence({
			value: [
				new asn1js.ObjectIdentifier({ value: this.type }),
				this.value
			]
		}));
		//endregion
	}
	//**********************************************************************************
	/**
	 * Convertion for the class to JSON object
	 * @returns {Object}
	 */
	toJSON()
	{
		const _object = {
			type: this.type
		};
 
		if(Object.keys(this.value).length !== 0)
			_object.value = this.value.toJSON();
		else
			_object.value = this.value;
 
		return _object;
	}
	//**********************************************************************************
	/**
	 * Compare two AttributeTypeAndValue values, or AttributeTypeAndValue with ArrayBuffer value
	 * @param {(AttributeTypeAndValue|ArrayBuffer)} compareTo The value compare to current
	 * @returns {boolean}
	 */
	isEqual(compareTo)
	{
		if(compareTo instanceof AttributeTypeAndValue)
		{
			if(this.type !== compareTo.type)
				return false;
			
			// noinspection OverlyComplexBooleanExpressionJS
			if(((this.value instanceof asn1js.Utf8String) && (compareTo.value instanceof asn1js.Utf8String)) ||
				((this.value instanceof asn1js.BmpString) && (compareTo.value instanceof asn1js.BmpString)) ||
				((this.value instanceof asn1js.UniversalString) && (compareTo.value instanceof asn1js.UniversalString)) ||
				((this.value instanceof asn1js.NumericString) && (compareTo.value instanceof asn1js.NumericString)) ||
				((this.value instanceof asn1js.PrintableString) && (compareTo.value instanceof asn1js.PrintableString)) ||
				((this.value instanceof asn1js.TeletexString) && (compareTo.value instanceof asn1js.TeletexString)) ||
				((this.value instanceof asn1js.VideotexString) && (compareTo.value instanceof asn1js.VideotexString)) ||
				((this.value instanceof asn1js.IA5String) && (compareTo.value instanceof asn1js.IA5String)) ||
				((this.value instanceof asn1js.GraphicString) && (compareTo.value instanceof asn1js.GraphicString)) ||
				((this.value instanceof asn1js.VisibleString) && (compareTo.value instanceof asn1js.VisibleString)) ||
				((this.value instanceof asn1js.GeneralString) && (compareTo.value instanceof asn1js.GeneralString)) ||
				((this.value instanceof asn1js.CharacterString) && (compareTo.value instanceof asn1js.CharacterString)))
			{
				const value1 = stringPrep(this.value.valueBlock.value);
				const value2 = stringPrep(compareTo.value.valueBlock.value);
				
				if(value1.localeCompare(value2) !== 0)
					return false;
			}
			else // Comparing as two ArrayBuffers
			{
				if(isEqualBuffer(this.value.valueBeforeDecode, compareTo.value.valueBeforeDecode) === false)
					return false;
			}
			
			return true;
		}
		
		if(compareTo instanceof ArrayBuffer)
			return isEqualBuffer(this.value.valueBeforeDecode, compareTo);
 
		return false;
	}
	//**********************************************************************************
}
//**************************************************************************************