ussd/common/recipient.go

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package common
import (
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"errors"
"fmt"
"regexp"
"strings"
)
// Define the regex patterns as constants
const (
phoneRegex = `^(?:\+254|254|0)?((?:7[0-9]{8})|(?:1[01][0-9]{7}))$`
addressRegex = `^0x[a-fA-F0-9]{40}$`
aliasRegex = `^[a-zA-Z0-9]+$`
)
// IsValidPhoneNumber checks if the given number is a valid phone number
func IsValidPhoneNumber(phonenumber string) bool {
match, _ := regexp.MatchString(phoneRegex, phonenumber)
return match
}
// IsValidAddress checks if the given address is a valid Ethereum address
func IsValidAddress(address string) bool {
match, _ := regexp.MatchString(addressRegex, address)
return match
}
// IsValidAlias checks if the alias is a valid alias format
func IsValidAlias(alias string) bool {
match, _ := regexp.MatchString(aliasRegex, alias)
return match
}
// CheckRecipient validates the recipient format based on the criteria
func CheckRecipient(recipient string) (string, error) {
if IsValidPhoneNumber(recipient) {
return "phone number", nil
}
if IsValidAddress(recipient) {
return "address", nil
}
if IsValidAlias(recipient) {
return "alias", nil
}
return "", fmt.Errorf("invalid recipient: must be a phone number, address or alias")
}
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// FormatPhoneNumber formats a Kenyan phone number to "+254xxxxxxxx".
func FormatPhoneNumber(phone string) (string, error) {
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if !IsValidPhoneNumber(phone) {
return "", errors.New("invalid phone number")
}
// Remove any leading "+" and spaces
phone = strings.TrimPrefix(phone, "+")
phone = strings.ReplaceAll(phone, " ", "")
// Replace leading "0" with "254" if present
if strings.HasPrefix(phone, "0") {
phone = "254" + phone[1:]
}
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// Add "+" if not already present
if !strings.HasPrefix(phone, "254") {
return "", errors.New("unexpected format")
}
return "+" + phone, nil
}