42 lines
1.3 KiB
Go
42 lines
1.3 KiB
Go
 
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package util
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import (
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"errors"
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"regexp"
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"strings"
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)
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// ErrInvalidPhoneNumber means a phone number is not an Indonesian mobile number.
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var ErrInvalidPhoneNumber = errors.New("invalid phone number format")
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// customerPhonePattern is an Indonesian mobile number in its stored form: 62, then the
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// number without its leading 0 (628…, 10 to 14 digits in all).
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var customerPhonePattern = regexp.MustCompile(`^628\d{7,11}$`)
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// NormalizePhoneNumber turns a customer's phone number into the one form it is stored
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// and looked up in, 62…: "0812-3456-1234", "+62 812 3456 1234", "62812…" and "812…"
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// all become "6281234561234". Spaces, dashes, dots and parentheses are dropped.
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func NormalizePhoneNumber(raw string) (string, error) {
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digits := strings.Map(func(r rune) rune {
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switch r {
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case ' ', '-', '.', '(', ')':
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return -1
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}
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return r
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}, strings.TrimSpace(raw))
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digits = strings.TrimPrefix(digits, "+")
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switch {
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case strings.HasPrefix(digits, "620"):
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// +62 typed in front of a number that kept its 0.
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digits = "62" + digits[3:]
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case strings.HasPrefix(digits, "0"):
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digits = "62" + digits[1:]
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case strings.HasPrefix(digits, "8"):
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digits = "62" + digits
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}
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if !customerPhonePattern.MatchString(digits) {
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return "", ErrInvalidPhoneNumber
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}
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return digits, nil
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}
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