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https://blitiri.com.ar/repos/chasquid
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f767b83fe0
This patch implements the first steps of support for IDNA (Internationalized Domain Names for Applications). Internally, we maintain the byte-agnostic representation, including configuration. We support receiving IDNA mail over SMTP, which we convert to unicode for internal handling. Local deliveries are still kept agnostic. For sending over SMTP, we use IDNA for DNS resolution, but there are some corner cases pending in the SMTP courier that are tied with SMTPUTF8 and will be fixed in subsequent patches.
77 lines
1.6 KiB
Go
77 lines
1.6 KiB
Go
// Package envelope implements functions related to handling email envelopes
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// (basically tuples of (from, to, data).
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package envelope
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import (
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"fmt"
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"strings"
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"golang.org/x/net/idna"
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"blitiri.com.ar/go/chasquid/internal/set"
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)
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// Split an user@domain address into user and domain.
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func Split(addr string) (string, string) {
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ps := strings.SplitN(addr, "@", 2)
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if len(ps) != 2 {
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return addr, ""
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}
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return ps[0], ps[1]
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}
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func UserOf(addr string) string {
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user, _ := Split(addr)
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return user
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}
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func DomainOf(addr string) string {
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_, domain := Split(addr)
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return domain
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}
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func DomainIn(addr string, locals *set.String) bool {
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domain := DomainOf(addr)
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if domain == "" {
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return true
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}
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return locals.Has(domain)
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}
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func AddHeader(data []byte, k, v string) []byte {
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// If the value contains newlines, indent them properly.
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if v[len(v)-1] == '\n' {
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v = v[:len(v)-1]
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}
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v = strings.Replace(v, "\n", "\n\t", -1)
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header := []byte(fmt.Sprintf("%s: %s\n", k, v))
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return append(header, data...)
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}
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// Take an address with a potentially unicode domain, and convert it to ASCII
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// as per IDNA.
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// The user part is unchanged.
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func IDNAToASCII(addr string) (string, error) {
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if addr == "<>" {
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return addr, nil
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}
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user, domain := Split(addr)
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domain, err := idna.ToASCII(domain)
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return user + "@" + domain, err
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}
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// Take an address with an ASCII domain, and convert it to Unicode as per
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// IDNA.
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// The user part is unchanged.
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func IDNAToUnicode(addr string) (string, error) {
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if addr == "<>" {
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return addr, nil
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}
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user, domain := Split(addr)
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domain, err := idna.ToUnicode(domain)
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return user + "@" + domain, err
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}
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