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validate.go
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validate.go
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package swift
import (
"github.com/jbub/banking/country"
)
const (
// lengthSwift8 represents length of type Swift8 swift codes.
lengthSwift8 = 8
// lengthSwift11 represents length of type Swift11 swift codes.
lengthSwift11 = 11
)
func validateLength(value string) error {
if l := len(value); l != lengthSwift8 && l != lengthSwift11 {
return ErrInvalidLength
}
return nil
}
func validateCase(value string) error {
for _, r := range value {
if 'a' <= r && r <= 'z' {
return ErrInvalidCase
}
}
return nil
}
func validateBankCode(value string) error {
if bankCode := extractBankCode(value); !validateAlpha(bankCode) {
return ErrInvalidBankCode
}
return nil
}
func validateCountryCode(value string) error {
code := extractCountryCode(value)
if !validateAlpha(code) {
return ErrInvalidCountryCode
}
if !country.Exists(code) {
return ErrCountryCodeNotPresent
}
return nil
}
func validateLocationCode(value string) error {
if code := extractLocationCode(value); !validateAlphaNum(code) {
return ErrInvalidLocationCode
}
return nil
}
func validateBranchCode(value string) error {
if !hasBranchCode(value) {
return nil
}
if code := extractBranchCode(value); !validateAlphaNum(code) {
return ErrInvalidBranchCode
}
return nil
}
func extractBankCode(value string) string {
return value[0:4]
}
func extractCountryCode(value string) string {
return value[4:6]
}
func extractLocationCode(value string) string {
return value[6:8]
}
func extractBranchCode(value string) string {
return value[8:11]
}
func hasBranchCode(value string) bool {
return len(value) == lengthSwift11
}
func validateAlpha(s string) bool {
return validateString(s, func(r rune) bool {
return 'A' <= r && r <= 'Z'
})
}
func validateAlphaNum(s string) bool {
return validateString(s, func(r rune) bool {
return ('A' <= r && r <= 'Z') || ('0' <= r && r <= '9')
})
}
func validateString(s string, validator func(rune) bool) bool {
if s == "" {
return false
}
for _, r := range s {
if !validator(r) {
return false
}
}
return true
}