api: Update timestamp type for RefreshTokenRef to int64.

api/api.proto

@@ -105,8 +105,8 @@ message RefreshTokenRef {
   // ID of the refresh token.
   string id = 1;
   string client_id = 2;
-  string created_at = 3;
-  string last_used = 4;
+  int64 created_at = 5;
+  int64 last_used = 6;
 }
 
 // ListRefreshReq is a request to enumerate the refresh tokens of a user.

server/api.go

@@ -19,7 +19,7 @@ import (
 
 // apiVersion increases every time a new call is added to the API. Clients should use this info
 // to determine if the server supports specific features.
-const apiVersion = 1
+const apiVersion = 2
 
 // NewAPI returns a server which implements the gRPC API interface.
 func NewAPI(s storage.Storage, logger logrus.FieldLogger) api.DexServer {
@@ -226,8 +226,8 @@ func (d dexAPI) ListRefresh(ctx context.Context, req *api.ListRefreshReq) (*api.
 		r := api.RefreshTokenRef{
 			Id:        session.ID,
 			ClientId:  session.ClientID,
-			CreatedAt: session.CreatedAt.String(),
-			LastUsed:  session.LastUsed.String(),
+			CreatedAt: session.CreatedAt.Unix(),
+			LastUsed:  session.LastUsed.Unix(),
 		}
 		refreshTokenRefs = append(refreshTokenRefs, &r)
 	}

server/api_test.go

@@ -146,10 +146,21 @@ func TestRefreshToken(t *testing.T) {
 		UserId: subjectString,
 	}
 
-	if _, err := serv.ListRefresh(ctx, &listReq); err != nil {
+	listResp, err := serv.ListRefresh(ctx, &listReq)
+	if err != nil {
 		t.Fatalf("Unable to list refresh tokens for user: %v", err)
 	}
 
+	for _, tok := range listResp.RefreshTokens {
+		if tok.CreatedAt != r.CreatedAt.Unix() {
+			t.Errorf("Expected CreatedAt timestamp %v, got %v", r.CreatedAt.Unix(), tok.CreatedAt)
+		}
+
+		if tok.LastUsed != r.LastUsed.Unix() {
+			t.Errorf("Expected LastUsed timestamp %v, got %v", r.LastUsed.Unix(), tok.LastUsed)
+		}
+	}
+
 	revokeReq := api.RevokeRefreshReq{
 		UserId:   subjectString,
 		ClientId: r.ClientID,