Remove diacritics from email

Signed-off-by: Tamal Saha <[email protected]>

go.mod

@@ -46,6 +46,7 @@ require (
 	gomodules.xyz/x v0.0.17
 	gomodules.xyz/zoom-lib-golang v0.0.0-20230924092137-92156e0a6cc9
 	google.golang.org/api v0.185.0
+	gopkg.in/Regis24GmbH/go-diacritics.v2 v2.0.3
 	gopkg.in/macaron.v1 v1.5.0
 	k8s.io/apimachinery v0.30.1
 	k8s.io/klog/v2 v2.130.1

go.sum

@@ -736,6 +736,8 @@ google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp0
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
 google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
+gopkg.in/Regis24GmbH/go-diacritics.v2 v2.0.3 h1:rz88vn1OH2B9kKorR+QCrcuw6WbizVwahU2Y9Q09xqU=
+gopkg.in/Regis24GmbH/go-diacritics.v2 v2.0.3/go.mod h1:vJmfdx2L0+30M90zUd0GCjLV14Ip3ZgWR5+MV1qljOo=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=

pkg/server/issuer.go

@@ -29,6 +29,7 @@ import (
 	"gomodules.xyz/cert"
 	"gomodules.xyz/cert/certstore"
 	. "gomodules.xyz/email-providers"
+	godiacritics "gopkg.in/Regis24GmbH/go-diacritics.v2"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
@@ -140,7 +141,7 @@ func CreateLicense(fs blobfs.Interface, certs *certstore.CertStore, info License
 	sans := AltNames{
 		DNSNames: []string{cluster},
 		EmailAddresses: []string{
-			fmt.Sprintf("%s <%s>", info.Name, info.Email),
+			fmt.Sprintf("%s <%s>", godiacritics.Normalize(info.Name), info.Email),
 			info.Email,
 		},
 	}