feat(validation): add validators
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382
ts/formats/ubl.validator.ts
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382
ts/formats/ubl.validator.ts
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import { BaseValidator } from './base.validator.js';
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import { ValidationLevel } from '../interfaces.js';
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import type { ValidationResult, ValidationError } from '../interfaces.js';
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import * as xpath from 'xpath';
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import { DOMParser } from 'xmldom';
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/**
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* Validator for UBL (Universal Business Language) invoice format
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* Implements validation rules according to EN16931 and UBL 2.1 specification
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*/
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export class UBLValidator extends BaseValidator {
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// XML namespaces for UBL
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private static NS_INVOICE = 'urn:oasis:names:specification:ubl:schema:xsd:Invoice-2';
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private static NS_CAC = 'urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2';
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private static NS_CBC = 'urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2';
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// XML document for processing
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private xmlDoc: Document | null = null;
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// UBL profile or customization ID
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private customizationId: string = '';
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constructor(xml: string) {
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super(xml);
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try {
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// Parse XML document
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this.xmlDoc = new DOMParser().parseFromString(xml, 'application/xml');
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// Determine UBL customization ID (e.g. EN16931, XRechnung)
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this.detectCustomizationId();
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} catch (error) {
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this.addError('UBL-PARSE', `Failed to parse XML: ${error}`, '/');
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}
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}
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/**
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* Validates the UBL invoice against the specified level
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* @param level Validation level
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* @returns Validation result
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*/
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public validate(level: ValidationLevel = ValidationLevel.SYNTAX): ValidationResult {
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// Reset errors
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this.errors = [];
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// Check if document was parsed successfully
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if (!this.xmlDoc) {
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return {
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valid: false,
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errors: this.errors,
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level: level
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};
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}
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// Perform validation based on level
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let valid = true;
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if (level === ValidationLevel.SYNTAX) {
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valid = this.validateSchema();
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} else if (level === ValidationLevel.SEMANTIC) {
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valid = this.validateSchema() && this.validateStructure();
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} else if (level === ValidationLevel.BUSINESS) {
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valid = this.validateSchema() &&
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this.validateStructure() &&
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this.validateBusinessRules();
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}
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return {
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valid,
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errors: this.errors,
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level
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};
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}
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/**
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* Validates XML against schema
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* @returns True if schema validation passed
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*/
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protected validateSchema(): boolean {
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// Basic schema validation (simplified for now)
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if (!this.xmlDoc) return false;
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// Check for root element
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const root = this.xmlDoc.documentElement;
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if (!root || (root.nodeName !== 'Invoice' && root.nodeName !== 'CreditNote')) {
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this.addError('UBL-SCHEMA-1', 'Root element must be Invoice or CreditNote', '/');
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return false;
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}
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// Check for required namespaces
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if (!root.lookupNamespaceURI('cac') || !root.lookupNamespaceURI('cbc')) {
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this.addError('UBL-SCHEMA-2', 'Required namespaces cac and cbc must be declared', '/');
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return false;
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}
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return true;
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}
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/**
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* Validates structure of the XML document
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* @returns True if structure validation passed
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*/
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private validateStructure(): boolean {
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if (!this.xmlDoc) return false;
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let valid = true;
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// Check for required main sections
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const sections = [
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'cbc:ID',
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'cbc:IssueDate',
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'cac:AccountingSupplierParty',
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'cac:AccountingCustomerParty',
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'cac:LegalMonetaryTotal'
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];
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for (const section of sections) {
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if (!this.exists(`/${this.getRootNodeName()}/${section}`)) {
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this.addError('UBL-STRUCT-1', `Required section ${section} is missing`, `/${this.getRootNodeName()}`);
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valid = false;
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}
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}
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// Check for TaxTotal section
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if (this.exists(`/${this.getRootNodeName()}/cac:TaxTotal`)) {
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const taxSubsections = [
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'cbc:TaxAmount',
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'cac:TaxSubtotal'
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];
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for (const subsection of taxSubsections) {
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if (!this.exists(`/${this.getRootNodeName()}/cac:TaxTotal/${subsection}`)) {
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this.addError('UBL-STRUCT-2', `Required subsection ${subsection} is missing`,
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`/${this.getRootNodeName()}/cac:TaxTotal`);
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valid = false;
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}
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}
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}
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return valid;
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}
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/**
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* Validates business rules
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* @returns True if business rule validation passed
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*/
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protected validateBusinessRules(): boolean {
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if (!this.xmlDoc) return false;
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let valid = true;
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// BR-16: Amount due for payment (BT-115) = Invoice total amount with VAT (BT-112) - Paid amount (BT-113)
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valid = this.validateAmounts() && valid;
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// BR-CO-3: Value added tax point date (BT-7) and Value added tax point date code (BT-8) are mutually exclusive
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valid = this.validateMutuallyExclusiveFields() && valid;
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// BR-S-1: An Invoice that contains a line where the VAT category code is "Standard rated"
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// shall contain the Seller VAT Identifier or the Seller tax representative VAT identifier
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valid = this.validateSellerVatIdentifier() && valid;
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// XRechnung specific rules when customization ID matches
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if (this.isXRechnung()) {
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valid = this.validateXRechnungRules() && valid;
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}
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return valid;
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}
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/**
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* Gets the root node name (Invoice or CreditNote)
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* @returns Root node name
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*/
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private getRootNodeName(): string {
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if (!this.xmlDoc || !this.xmlDoc.documentElement) return 'Invoice';
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return this.xmlDoc.documentElement.nodeName;
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}
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/**
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* Detects UBL customization ID from the XML
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*/
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private detectCustomizationId(): void {
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if (!this.xmlDoc) return;
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// Look for customization ID
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const customizationNode = xpath.select1(
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`string(/${this.getRootNodeName()}/cbc:CustomizationID)`,
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this.xmlDoc
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);
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if (customizationNode) {
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this.customizationId = customizationNode.toString();
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}
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}
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/**
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* Checks if invoice is an XRechnung
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* @returns True if XRechnung customization ID is present
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*/
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private isXRechnung(): boolean {
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return this.customizationId.includes('xrechnung') ||
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this.customizationId.includes('XRechnung');
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}
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/**
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* Validates amount calculations in the invoice
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* @returns True if amount validation passed
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*/
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private validateAmounts(): boolean {
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if (!this.xmlDoc) return false;
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try {
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// Extract amounts
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const totalAmount = this.getNumberValue(
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`/${this.getRootNodeName()}/cac:LegalMonetaryTotal/cbc:TaxInclusiveAmount`
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);
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const paidAmount = this.getNumberValue(
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`/${this.getRootNodeName()}/cac:LegalMonetaryTotal/cbc:PrepaidAmount`
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) || 0;
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const dueAmount = this.getNumberValue(
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`/${this.getRootNodeName()}/cac:LegalMonetaryTotal/cbc:PayableAmount`
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);
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// Calculate expected due amount
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const expectedDueAmount = totalAmount - paidAmount;
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// Compare with a small tolerance for rounding errors
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if (Math.abs(dueAmount - expectedDueAmount) > 0.01) {
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this.addError(
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'BR-16',
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`Amount due for payment (${dueAmount}) must equal Invoice total amount with VAT (${totalAmount}) - Paid amount (${paidAmount})`,
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`/${this.getRootNodeName()}/cac:LegalMonetaryTotal`
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);
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return false;
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}
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return true;
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} catch (error) {
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this.addError('UBL-AMOUNT', `Error validating amounts: ${error}`, '/');
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return false;
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}
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}
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/**
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* Validates mutually exclusive fields
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* @returns True if validation passed
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*/
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private validateMutuallyExclusiveFields(): boolean {
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if (!this.xmlDoc) return false;
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try {
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// Check for VAT point date and code (BR-CO-3)
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const vatPointDate = this.exists(`/${this.getRootNodeName()}/cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory/cbc:TaxPointDate`);
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const vatPointDateCode = this.exists(`/${this.getRootNodeName()}/cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory/cbc:TaxExemptionReasonCode`);
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if (vatPointDate && vatPointDateCode) {
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this.addError(
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'BR-CO-3',
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'Value added tax point date and Value added tax point date code are mutually exclusive',
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`/${this.getRootNodeName()}/cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory`
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);
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return false;
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}
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return true;
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} catch (error) {
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this.addError('UBL-MUTUAL', `Error validating mutually exclusive fields: ${error}`, '/');
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return false;
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}
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}
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/**
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* Validates seller VAT identifier requirements
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* @returns True if validation passed
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*/
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private validateSellerVatIdentifier(): boolean {
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if (!this.xmlDoc) return false;
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try {
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// Check if there are any standard rated line items
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const standardRatedItems = this.exists(
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`/${this.getRootNodeName()}/cac:InvoiceLine/cac:Item/cac:ClassifiedTaxCategory/cbc:ID[text()="S"]`
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);
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if (standardRatedItems) {
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// Check for seller VAT identifier
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const sellerVatId = this.exists(`/${this.getRootNodeName()}/cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme/cbc:CompanyID`);
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const sellerTaxRepId = this.exists(`/${this.getRootNodeName()}/cac:TaxRepresentativeParty/cac:PartyTaxScheme/cbc:CompanyID`);
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if (!sellerVatId && !sellerTaxRepId) {
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this.addError(
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'BR-S-1',
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'An Invoice with standard rated items must contain the Seller VAT Identifier or Tax representative VAT identifier',
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`/${this.getRootNodeName()}/cac:AccountingSupplierParty/cac:Party`
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);
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return false;
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}
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}
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return true;
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} catch (error) {
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this.addError('UBL-VAT', `Error validating seller VAT identifier: ${error}`, '/');
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return false;
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}
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}
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/**
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* Validates XRechnung specific rules
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* @returns True if validation passed
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*/
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private validateXRechnungRules(): boolean {
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if (!this.xmlDoc) return false;
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let valid = true;
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try {
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// BR-DE-1: Buyer reference must be present for German VAT compliance
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if (!this.exists(`/${this.getRootNodeName()}/cbc:BuyerReference`)) {
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this.addError(
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'BR-DE-1',
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'BuyerReference is mandatory for XRechnung',
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`/${this.getRootNodeName()}`
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);
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valid = false;
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}
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// BR-DE-15: Contact information must be present
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if (!this.exists(`/${this.getRootNodeName()}/cac:AccountingSupplierParty/cac:Party/cac:Contact`)) {
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this.addError(
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'BR-DE-15',
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'Supplier contact information is mandatory for XRechnung',
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`/${this.getRootNodeName()}/cac:AccountingSupplierParty/cac:Party`
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);
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valid = false;
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}
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// BR-DE-16: Electronic address identifier scheme (e.g. PEPPOL) must be present
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if (!this.exists(`/${this.getRootNodeName()}/cac:AccountingSupplierParty/cac:Party/cbc:EndpointID`) ||
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!this.exists(`/${this.getRootNodeName()}/cac:AccountingSupplierParty/cac:Party/cbc:EndpointID/@schemeID`)) {
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this.addError(
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'BR-DE-16',
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'Supplier electronic address with scheme identifier is mandatory for XRechnung',
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`/${this.getRootNodeName()}/cac:AccountingSupplierParty/cac:Party`
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);
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valid = false;
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}
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return valid;
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} catch (error) {
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this.addError('UBL-XRECHNUNG', `Error validating XRechnung rules: ${error}`, '/');
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return false;
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}
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}
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/**
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* Helper method to check if a node exists
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* @param xpathExpression XPath to check
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* @returns True if node exists
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*/
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private exists(xpathExpression: string): boolean {
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if (!this.xmlDoc) return false;
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const nodes = xpath.select(xpathExpression, this.xmlDoc);
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// Handle different return types from xpath.select()
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if (Array.isArray(nodes)) {
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return nodes.length > 0;
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}
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return nodes ? true : false;
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}
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/**
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* Helper method to get a number value from XPath
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* @param xpathExpression XPath to get number from
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* @returns Number value or NaN if not found
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*/
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private getNumberValue(xpathExpression: string): number {
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if (!this.xmlDoc) return NaN;
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const node = xpath.select1(`string(${xpathExpression})`, this.xmlDoc);
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return node ? parseFloat(node.toString()) : NaN;
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}
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}
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