codegirl007
f61b4fc7ab
Require email at registration (editable on profile), add a Resend mailer with idempotent first-answer sends, and keep answer saves independent of delivery.
53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
package store
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import (
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"fmt"
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"net/mail"
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"strings"
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"unicode/utf8"
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)
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const (
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minEmailLen = 3
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maxEmailLen = 254
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)
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// NormalizeEmail trims and lowercases an address for storage/comparison.
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func NormalizeEmail(s string) string {
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return strings.ToLower(strings.TrimSpace(s))
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}
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// ValidateEmail returns a normalized address or an error message suitable for UI.
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func ValidateEmail(raw string) (normalized string, errMsg string) {
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normalized = NormalizeEmail(raw)
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if normalized == "" {
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return "", "Email is required."
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}
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n := utf8.RuneCountInString(normalized)
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if n < minEmailLen || len(normalized) > maxEmailLen {
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return "", "Enter a valid email address."
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}
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addr, err := mail.ParseAddress(normalized)
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if err != nil || addr.Address != normalized {
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return "", "Enter a valid email address."
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}
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at := strings.LastIndex(normalized, "@")
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if at < 1 || at == len(normalized)-1 {
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return "", "Enter a valid email address."
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}
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domain := normalized[at+1:]
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if !strings.Contains(domain, ".") || strings.HasPrefix(domain, ".") || strings.HasSuffix(domain, ".") {
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return "", "Enter a valid email address."
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}
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return normalized, ""
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}
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// MustValidateEmail is like ValidateEmail but returns a Go error.
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func MustValidateEmail(raw string) (string, error) {
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n, msg := ValidateEmail(raw)
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if msg != "" {
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return "", fmt.Errorf("%s", msg)
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}
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return n, nil
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}
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