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normalizer.go
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normalizer.go
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package loginid
import (
"fmt"
"strings"
"golang.org/x/net/idna"
"golang.org/x/text/secure/precis"
"golang.org/x/text/unicode/norm"
"github.com/authgear/authgear-server/pkg/api/internalinterface"
"github.com/authgear/authgear-server/pkg/api/model"
"github.com/authgear/authgear-server/pkg/lib/config"
"github.com/authgear/authgear-server/pkg/util/phone"
)
type NormalizerFactory struct {
Config *config.LoginIDConfig
}
func (f *NormalizerFactory) NormalizerWithLoginIDType(loginIDKeyType model.LoginIDKeyType) internalinterface.LoginIDNormalizer {
switch loginIDKeyType {
case model.LoginIDKeyTypeEmail:
return &EmailNormalizer{
Config: f.Config.Types.Email,
}
case model.LoginIDKeyTypeUsername:
return &UsernameNormalizer{
Config: f.Config.Types.Username,
}
case model.LoginIDKeyTypePhone:
return &PhoneNumberNormalizer{}
}
return &NullNormalizer{}
}
type EmailNormalizer struct {
Config *config.LoginIDEmailConfig
}
var _ internalinterface.LoginIDNormalizer = &EmailNormalizer{}
func (n *EmailNormalizer) Normalize(loginID string) (string, error) {
// refs from stdlib
// https://golang.org/src/net/mail/message.go?s=5217:5250#L172
at := strings.LastIndex(loginID, "@")
if at < 0 {
panic("loginid: malformed address, should be rejected by the email format checker")
}
local, domain := loginID[:at], loginID[at+1:]
// convert the domain part
var err error
p := precis.NewFreeform(precis.FoldCase())
domain, err = p.String(domain)
if err != nil {
return "", fmt.Errorf("failed to case fold email: %w", err)
}
// convert the local part
local = norm.NFKC.String(local)
if !*n.Config.CaseSensitive {
local, err = p.String(local)
if err != nil {
return "", fmt.Errorf("failed to case fold email: %w", err)
}
}
if *n.Config.IgnoreDotSign {
local = strings.Replace(local, ".", "", -1)
}
return local + "@" + domain, nil
}
func (n *EmailNormalizer) ComputeUniqueKey(normalizeLoginID string) (string, error) {
at := strings.LastIndex(normalizeLoginID, "@")
if at < 0 {
panic("loginid: malformed address, should be rejected by the email format checker")
}
local, domain := normalizeLoginID[:at], normalizeLoginID[at+1:]
punycode, err := idna.ToASCII(domain)
if err != nil {
return "", err
}
domain = punycode
return local + "@" + domain, nil
}
type UsernameNormalizer struct {
Config *config.LoginIDUsernameConfig
}
var _ internalinterface.LoginIDNormalizer = &UsernameNormalizer{}
func (n *UsernameNormalizer) Normalize(loginID string) (string, error) {
loginID = norm.NFKC.String(loginID)
var err error
if !*n.Config.CaseSensitive {
p := precis.NewIdentifier(precis.FoldCase())
loginID, err = p.String(loginID)
if err != nil {
return "", fmt.Errorf("failed to case fold username: %w", err)
}
}
return loginID, nil
}
func (n *UsernameNormalizer) ComputeUniqueKey(normalizeLoginID string) (string, error) {
return normalizeLoginID, nil
}
type PhoneNumberNormalizer struct {
}
var _ internalinterface.LoginIDNormalizer = &PhoneNumberNormalizer{}
func (n *PhoneNumberNormalizer) Normalize(loginID string) (string, error) {
e164, err := phone.LegalParser.ParseInputPhoneNumber(loginID)
if err != nil {
return "", err
}
return e164, nil
}
func (n *PhoneNumberNormalizer) ComputeUniqueKey(normalizeLoginID string) (string, error) {
return normalizeLoginID, nil
}
type NullNormalizer struct{}
var _ internalinterface.LoginIDNormalizer = &NullNormalizer{}
func (n *NullNormalizer) Normalize(loginID string) (string, error) {
return loginID, nil
}
func (n *NullNormalizer) ComputeUniqueKey(normalizeLoginID string) (string, error) {
return normalizeLoginID, nil
}