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import "code.pfad.fr/swift"
package swift provides methods to check the validity of an IBAN (and retrieve the BIC for some countries). Play with the [demo in the browser], powered by JS+Wasm.
Example
// SPDX-FileCopyrightText: 2023 Olivier Charvin <git@olivier.pfad.fr>
//
// SPDX-License-Identifier: CC0-1.0
package main
import (
"fmt"
"code.pfad.fr/swift"
"code.pfad.fr/swift/bic"
)
var germanTestIBAN = "DE75512108001245126199"
func main() {
iban, err := swift.NewIBAN(germanTestIBAN, swift.CountryBelongsToSEPA())
if err != nil {
panic(err)
}
fmt.Println("IBAN:", iban.MaskedAndSpaced())
fmt.Println("BIC: ", bic.FromIBAN(iban).String())
}
var ErrCountryNotInRegistry = errors.New("country is not listed in the IBAN registry")
ErrCountryNotInRegistry is returned when a country is not listed in the iban registry.
var ErrCountryOutsideSEPA = errors.New("country is outside the Single Euro Payments Area (SEPA)")
ErrCountryOutsideSEPA is returned when a country does not belong to the Single Euro Payments Area.
type BIC struct {
Institution string // 4 letters
CountryCode CountryCode // 2 letters (ISO 3166-1 alpha-2 code)
Location string // 2 letters or digits
Branch string // 3 letters or digits (optional)
}
BIC represents the routing information as specified by ISO 9362 (also known as Business Identifier Codes (BIC), SWIFT ID or SWIFT code, and SWIFT-BIC).
func NewBIC(s string) (BIC, error)
NewBIC uppercases a BIC and perform some basic checks (format and length). If the country code is unknown the BIC will be accepted, call [CountryCode.BelongsToIBANRegistry] or [CountryCode.BelongsToSEPA] to perform additional validation.
func (b BIC) String() string
String returns the BIC.
type CheckDigitsError struct {
Expected int
Actual int
NationalCheck bool // true if the check failed at the country level (within the BBAN)
}
CheckDigitsError indicates that the checksum did not match the expected check digits.
func (e CheckDigitsError) Error() string
type CountryCode string
CountryCode is the ISO 3166-1 alpha-2 code of the country (uppercase)
func (cc CountryCode) BelongsToIBANRegistry() bool
BelongsToIBANRegistry returns true if the country is listed in the iban registry [https://www.swift.com/resource/iban-registry-pdf]
https://www.swift.com/resource/iban-registry-pdf
func (cc CountryCode) BelongsToSEPA() bool
BelongsToSEPA indicates if a country belongs to the Single Euro Payments Area according to [https://www.swift.com/resource/iban-registry-pdf]
https://www.swift.com/resource/iban-registry-pdf
type ExpectedCharType = format.ExpectedCharType
const ( ExpectedNoMoreChar ExpectedCharType = format.NoMoreChar ExpectedUppercaseAlphaChar ExpectedCharType = format.UppercaseAlphaChar // (A-Z) ExpectedAlphaChar ExpectedCharType = format.AlphaChar // (a-z, A-Z) ExpectedNumericChar ExpectedCharType = format.ExpectedNumericChar // (0-9) ExpectedAlphaNumericChar ExpectedCharType = format.ExpectedAlphaNumericChar // (a-z, A-Z, 0-9) )
type FormatError struct {
Position int // index in the submitted string where the error occurred
Expected ExpectedCharType // expected type of character
Got string // submitted character
Part string // part of the submitted string considered (all chars should conform to the expected type)
PartPosition int // start index of the part above
}
FormatError indicates that an unexpected character type was encountered.
func (e FormatError) Error() string
type IBAN struct {
CountryCode CountryCode
CheckDigits int
BBAN string
}
IBAN represents an International Bank Account Number
func NewIBAN(s string, additionalRules ...IBANValidator) (IBAN, error)
NewIBAN sanitizes, parses and checks an IBAN (length, format, check digit sum). See [CountryBelongsToIBANRegistry] and [CountryBelongsToSEPA] to perform country code validation. See [NationalFormatCheck] to additionnally verify the national format.
func (iban IBAN) MaskedAndSpaced() string
MaskedAndSpaced returns the spaced IBAN with only the first and last 3 characters of the BBAN visible (other chars are replaced with "*").
IBANs are not secret, but it shouldn't hurt to hide parts of them. Since BBANs are longer than 11 characters, at least 5 chars will be hidden (still partially recoverable using the leading check digits). Example:
DE75 512* **** **** ***1 99
func (iban IBAN) Spaced() string
Spaced returns the IBAN with spaces between every 4 characters.
func (iban IBAN) String() string
String returns the IBAN, without spaces
type IBANValidator func(IBAN) error
IBANValidator makes additional checks on a given IBAN.
func CountryBelongsToIBANRegistry() IBANValidator
CountryBelongsToIBANRegistry ensures that the country is listed in the iban registry [https://www.swift.com/resource/iban-registry-pdf]
https://www.swift.com/resource/iban-registry-pdf
func CountryBelongsToSEPA() IBANValidator
CountryBelongsToSEPA ensures that the country belongs to the Single Euro Payments Area according to [https://www.swift.com/resource/iban-registry-pdf]
https://www.swift.com/resource/iban-registry-pdf
func NationalFormatCheck() IBANValidator
NationalFormatCheck checks the national rules (format and check digits), if there is a registered BBANChecker for this country code.
type TooShortError struct {
ActualLen int
ExpectedLen int
}
TooShortError indicates that the provided string is shorter than expected.
func (e TooShortError) Error() string
package bic computes the BIC from an IBAN (for supported countries).
iban analyses an International Bank Account Number (IBAN).
package format is used internally to describe the format of an IBAN.
https://codeberg.org/pfad.fr/swift
git clone
https://codeberg.org/pfad.fr/swift.git git@codeberg.org:pfad.fr/swift.git