auth with cas

vendor/gopkg.in/cas.v2/logout_request.go

@@ -0,0 +1,65 @@
+package cas
+
+import (
+	"crypto/rand"
+	"encoding/xml"
+	"strings"
+	"time"
+)
+
+// Represents the XML CAS Single Log Out Request data
+type logoutRequest struct {
+	XMLName         xml.Name  `xml:"urn:oasis:names:tc:SAML:2.0:protocol LogoutRequest"`
+	Version         string    `xml:"Version,attr"`
+	IssueInstant    time.Time `xml:"-"`
+	RawIssueInstant string    `xml:"IssueInstant,attr"`
+	ID              string    `xml:"ID,attr"`
+	NameID          string    `xml:"urn:oasis:names:tc:SAML:2.0:assertion NameID"`
+	SessionIndex    string    `xml:"SessionIndex"`
+}
+
+func parseLogoutRequest(data []byte) (*logoutRequest, error) {
+	l := &logoutRequest{}
+	if err := xml.Unmarshal(data, &l); err != nil {
+		return nil, err
+	}
+
+	t, err := time.Parse(time.RFC1123Z, l.RawIssueInstant)
+	if err != nil {
+		return nil, err
+	}
+
+	l.IssueInstant = t
+	l.NameID = strings.TrimSpace(l.NameID)
+	l.SessionIndex = strings.TrimSpace(l.SessionIndex)
+
+	return l, nil
+}
+
+func newLogoutRequestId() string {
+	const alphabet = "abcdef0123456789"
+
+	// generate 64 character string
+	bytes := make([]byte, 64)
+	rand.Read(bytes)
+
+	for k, v := range bytes {
+		bytes[k] = alphabet[v%byte(len(alphabet))]
+	}
+
+	return string(bytes)
+}
+
+func xmlLogoutRequest(ticket string) ([]byte, error) {
+	l := &logoutRequest{
+		Version:      "2.0",
+		IssueInstant: time.Now().UTC(),
+		ID:           newLogoutRequestId(),
+		NameID:       "@NOT_USED@",
+		SessionIndex: ticket,
+	}
+
+	l.RawIssueInstant = l.IssueInstant.Format(time.RFC1123Z)
+
+	return xml.MarshalIndent(l, "", "  ")
+}