The project contains two OSGi bundles that provide online EU VAT number validation with VAT Information Exchange System (VIES).

1. vat-checker-api.jar - Java model for VIES API
2. vat-checker-service.jar - service client that uses classes generated from WSDL published by VIES

Bundle offers simple Java service interface:

package org.synus.vies.api;
public interface VatChecker {
    VatCheckerResult checkVat(Country country, String vatNumber);

The implementation catches all exceptions (logs them with slf4j) and always returns a result instance of type:

// ...
public class VatCheckerResult {

    private final Country country;
    private final String vatNumber;
    private final Optional<LocalDateTime> requestDate;
    private final boolean valid;
    private final Optional<String> name;
    private final Optional<String> address;
    private final Optional<VatCheckerError> error;
// ...

Returned VatCheckerResult instance can be in following states:

1. VAT valid: valid=true
2. VAT invalid: valid=false and error is empty
3. VAT checker error: valid=false and error has enum value

   public enum VatCheckerError {
       INVALID_INPUT,
       INVALID_REQUESTER_INFO,
       SERVICE_UNAVAILABLE,
       MS_UNAVAILABLE,
       TIMEOUT,
       VAT_BLOCKED,
       IP_BLOCKED,
       GLOBAL_MAX_CONCURRENT_REQ,
       GLOBAL_MAX_CONCURRENT_REQ_TIME,
       MS_MAX_CONCURRENT_REQ,
       MS_MAX_CONCURRENT_REQ_TIME,
       UNEXPECTED,
   }

Build and install both api and implementation jars on your osgi container.

$ ./gradlew build # to build both jars jar
$ cp vat-checker-api/build/libs/vat-checker-api-1.0.0.jar $MY_OSGI_CONTAINER
$ cp vat-checker-service/build/libs/vat-checker-service-1.0.0.jar $MY_OSGI_CONTAINER

build.gradle:

dependencies {
    compileOnly 'org.synus.vies:vat-checker-api:1.0.0'
}

@Component(
        property = {"osgi.command.function=checkvat", "osgi.command.scope=blade"},
        service = Object.class
)
public class ExampleCommand {

    @Reference
    private volatile VatChecker vatChecker;

    public void checkvat(String country, String vatNumber) {
        System.out.println(vatChecker.checkVat(Country.valueOf(country), vatNumber).isValid());
    }

}

$ telnet localhost 11311
Welcome to Apache Felix Gogo

g! checkvat "SK" "2020216748"
true

Want to hack on vat-checker? See CONTRIBUTING.md for information on building, testing and contributing changes.

They are probably not perfect, please let me know if anything feels wrong or incomplete.

The contents of this repository are made available to the public under the terms of the Apache License, Version 2.0. Bundles may depend on non Apache Licensed code.