diff --git a/pkg/oidc/token_request.go b/pkg/oidc/token_request.go
index 56c4f1c..989e792 100644
--- a/pkg/oidc/token_request.go
+++ b/pkg/oidc/token_request.go
@@ -32,6 +32,11 @@ const (
 	ClientAssertionTypeJWTAssertion = "urn:ietf:params:oauth:client-assertion-type:jwt-bearer"
 )
 
+var AllGrantTypes = []GrantType{
+	GrantTypeCode, GrantTypeRefreshToken, GrantTypeClientCredentials,
+	GrantTypeBearer, GrantTypeTokenExchange, GrantTypeImplicit,
+	ClientAssertionTypeJWTAssertion}
+
 type GrantType string
 
 type TokenRequest interface {
diff --git a/pkg/oidc/types.go b/pkg/oidc/types.go
index b6a75f4..1260798 100644
--- a/pkg/oidc/types.go
+++ b/pkg/oidc/types.go
@@ -1,7 +1,9 @@
 package oidc
 
 import (
+	"database/sql/driver"
 	"encoding/json"
+	"fmt"
 	"strings"
 	"time"
 
@@ -95,6 +97,34 @@ func (s *SpaceDelimitedArray) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+func (s *SpaceDelimitedArray) Scan(src interface{}) error {
+	if src == nil {
+		*s = nil
+		return nil
+	}
+	switch v := src.(type) {
+	case string:
+		if len(v) == 0 {
+			*s = SpaceDelimitedArray{}
+			return nil
+		}
+		*s = strings.Split(v, " ")
+	case []byte:
+		if len(v) == 0 {
+			*s = SpaceDelimitedArray{}
+			return nil
+		}
+		*s = strings.Split(string(v), " ")
+	default:
+		return fmt.Errorf("cannot convert %T to SpaceDelimitedArray", src)
+	}
+	return nil
+}
+
+func (s SpaceDelimitedArray) Value() (driver.Value, error) {
+	return strings.Join(s, " "), nil
+}
+
 type Time time.Time
 
 func (t *Time) UnmarshalJSON(data []byte) error {
diff --git a/pkg/oidc/types_test.go b/pkg/oidc/types_test.go
index c03a775..6c62c40 100644
--- a/pkg/oidc/types_test.go
+++ b/pkg/oidc/types_test.go
@@ -3,6 +3,8 @@ package oidc
 import (
 	"bytes"
 	"encoding/json"
+	"strconv"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -228,6 +230,7 @@ func TestScopes_UnmarshalText(t *testing.T) {
 		})
 	}
 }
+
 func TestScopes_MarshalText(t *testing.T) {
 	type args struct {
 		scopes SpaceDelimitedArray
@@ -294,3 +297,41 @@ func TestScopes_MarshalText(t *testing.T) {
 		})
 	}
 }
+
+func TestSpaceDelimitatedArray_ValuerNotNil(t *testing.T) {
+	inputs := [][]string{
+		{"two", "elements"},
+		{"one"},
+		{ /*zero*/ },
+	}
+	for _, input := range inputs {
+		t.Run(strconv.Itoa(len(input))+strings.Join(input, "_"), func(t *testing.T) {
+			sda := SpaceDelimitedArray(input)
+			dbValue, err := sda.Value()
+			if !assert.NoError(t, err, "Value") {
+				return
+			}
+			var reversed SpaceDelimitedArray
+			err = reversed.Scan(dbValue)
+			if assert.NoError(t, err, "Scan string") {
+				assert.Equal(t, sda, reversed, "scan string")
+			}
+			reversed = nil
+			dbValueString, ok := dbValue.(string)
+			if assert.True(t, ok, "dbValue is string") {
+				err = reversed.Scan([]byte(dbValueString))
+				if assert.NoError(t, err, "Scan bytes") {
+					assert.Equal(t, sda, reversed, "scan bytes")
+				}
+			}
+		})
+	}
+}
+
+func TestSpaceDelimitatedArray_ValuerNil(t *testing.T) {
+	var reversed SpaceDelimitedArray
+	err := reversed.Scan(nil)
+	if assert.NoError(t, err, "Scan nil") {
+		assert.Equal(t, SpaceDelimitedArray(nil), reversed, "scan nil")
+	}
+}