45 lines
1.5 KiB
Go
45 lines
1.5 KiB
Go
// Package valueobject contains the domain's immutable, self-validating value objects.
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// Zero external imports: this is layer 1 of Clean Architecture (see PLAN.md section 3).
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package valueobject
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import (
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"errors"
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"strings"
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)
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// EmailAddress is an RFC 5322 mailbox address, normalized with a lowercased domain.
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type EmailAddress struct {
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localPart string
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domain string
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}
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var (
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ErrEmailMissingAtSign = errors.New("email address: missing '@' separator")
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ErrEmailEmptyLocalPart = errors.New("email address: local part must not be empty")
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ErrEmailEmptyDomain = errors.New("email address: domain must not be empty")
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ErrEmailLocalPartTooLong = errors.New("email address: local part exceeds 64 octets (RFC 5321 4.5.3.1.1)")
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)
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// NewEmailAddress validates and normalizes raw into an EmailAddress.
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func NewEmailAddress(raw string) (EmailAddress, error) {
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at := strings.LastIndex(raw, "@")
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if at < 0 {
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return EmailAddress{}, ErrEmailMissingAtSign
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}
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local, domain := raw[:at], raw[at+1:]
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if local == "" {
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return EmailAddress{}, ErrEmailEmptyLocalPart
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}
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if len(local) > 64 {
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return EmailAddress{}, ErrEmailLocalPartTooLong
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}
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if domain == "" {
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return EmailAddress{}, ErrEmailEmptyDomain
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}
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return EmailAddress{localPart: local, domain: strings.ToLower(domain)}, nil
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}
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func (e EmailAddress) LocalPart() string { return e.localPart }
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func (e EmailAddress) Domain() string { return e.domain }
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func (e EmailAddress) String() string { return e.localPart + "@" + e.domain }
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