feat: add deprecation tags to credential types and issuers

descriptions.go

@@ -49,6 +49,7 @@ type Issuer struct {
 	SchemeManagerID string           `xml:"SchemeManager"`
 	ContactAddress  string
 	ContactEMail    string
+	DeprecatedSince Timestamp
 	XMLVersion      int `xml:"version,attr"`
 
 	Valid bool `xml:"-"`
@@ -68,6 +69,7 @@ type CredentialType struct {
 	XMLVersion      int              `xml:"version,attr"`
 	XMLName         xml.Name         `xml:"IssueSpecification"`
 	IssueURL        TranslatedString `xml:"IssueURL"`
+	DeprecatedSince Timestamp
 
 	Valid bool `xml:"-"`
 }

requests.go

@@ -2,6 +2,7 @@ package irma
 
 import (
 	"encoding/json"
+	"encoding/xml"
 	"fmt"
 	"io/ioutil"
 	"strconv"
@@ -652,6 +653,19 @@ func (t Timestamp) After(u Timestamp) bool {
 	return time.Time(t).After(time.Time(u))
 }
 
+func (t *Timestamp) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
+	return e.EncodeElement(t.String(), start)
+}
+
+func (t *Timestamp) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	var ts int64
+	if err := d.DecodeElement(&ts, &start); err != nil {
+		return err
+	}
+	*t = Timestamp(time.Unix(ts, 0))
+	return nil
+}
+
 // MarshalJSON marshals a timestamp.
 func (t *Timestamp) MarshalJSON() ([]byte, error) {
 	return []byte(t.String()), nil