Add support for boolean values in bound claims (#73)

claims.go

@@ -128,7 +128,7 @@ func validateBoundClaims(logger log.Logger, boundClaims, allClaims map[string]in
 	return nil
 }
 
-// normalizeList takes a string or list and returns a list. This is useful when
+// normalizeList takes a string, bool or list and returns a list. This is useful when
 // providers are expected to return a list (typically of strings) but reduce it
 // to a string type when the list count is 1.
 func normalizeList(raw interface{}) ([]interface{}, bool) {
@@ -137,7 +137,7 @@ func normalizeList(raw interface{}) ([]interface{}, bool) {
 	switch v := raw.(type) {
 	case []interface{}:
 		normalized = v
-	case string:
+	case string, bool:
 		normalized = []interface{}{v}
 	default:
 		return nil, false

claims_test.go

@@ -208,6 +208,16 @@ func TestValidateBoundClaims(t *testing.T) {
 			},
 			errExpected: false,
 		},
+		{
+			name: "valid - boolean claim",
+			boundClaims: map[string]interface{}{
+				"email_verified": []interface{}{false},
+			},
+			allClaims: map[string]interface{}{
+				"email_verified": []interface{}{false},
+			},
+			errExpected: false,
+		},
 		{
 			name: "valid - match within list",
 			boundClaims: map[string]interface{}{
@@ -360,6 +370,17 @@ func TestValidateBoundClaims(t *testing.T) {
 			},
 			errExpected: true,
 		},
+		{
+			name: "invalid bound claim expected boolean value",
+			boundClaims: map[string]interface{}{
+				"email_verified": true,
+			},
+			allClaims: map[string]interface{}{
+				"email_verified": "true",
+			},
+			errExpected: true,
+		},
+
 		{
 			name: "invalid received claim expected value",
 			boundClaims: map[string]interface{}{