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vat.go
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vat.go
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package vat
import (
"errors"
"time"
)
var (
// ErrInvalidVATNumberFormat is returned when given VAT Number is in a invalid format
ErrInvalidVATNumberFormat = errors.New("vat: invalid VAT number format")
// ErrServiceUnreachable is returned when we cannot connect to VIES VAT Service
ErrServiceUnreachable = errors.New("vat: VIES service is unreachable")
// ErrVIESInvalidInput is returned based on VIES response
ErrVIESInvalidInput = errors.New("vat: VAT number is invalid")
// ErrVIESGlobalMaxConcurrentRequest is returned based on VIES response
ErrVIESGlobalMaxConcurrentRequest = errors.New("vat: the maximum number of global concurrent requests has been reached, try again later")
// ErrVIESMSMaxConcurrentRequest is returned based on VIES response
ErrVIESMSMaxConcurrentRequest = errors.New("vat: the maximum number of concurrent requests for this member state has been reached, try again later")
// ErrVIESServiceUnavailable is returned based on VIES response
ErrVIESServiceUnavailable = errors.New("vat: an error was encountered either at the network level or the web application level, try again later")
// ErrVIESMSUnavailable is returned based on VIES response
ErrVIESMSUnavailable = errors.New("vat: the application at the member state is not replying or not available, try again later")
// ErrVIESTimeout is returned based on VIES response
ErrVIESTimeout = errors.New("vat: the application did not receive a reply within the allocated time period, try again later")
)
// Response is the model returned from VIES query
type Response struct {
IsValid bool
VATNumber string
CountryCode string
RequestDate time.Time
Name string
Address string
}
// Query VIES service to check if VAT is valid
func Query(vatNumber string) (*Response, error) {
vatNumber = sanitizeVATNumber(vatNumber)
isValidFormat, _ := ValidateNumberFormat(vatNumber)
if !isValidFormat {
return nil, ErrInvalidVATNumberFormat
}
var (
response *Response
err error
)
retry(4, 1*time.Second, func() bool {
response, err = sendRequestVIES(vatNumber)
// only retry if there's an error and it's different than INVALID_INPUT
return err != nil && err != ErrVIESInvalidInput
})
return response, err
}