go: handle demoting admin to regular-user level

modules/user/user.go

@@ -259,8 +259,9 @@ func UpdateUserByAdmin(ctx context.Context, client *ent.Client, id uuid.UUID, em
 
 	var u int
 
+	switch {
 	// ignore updates to password when user finished setting up (if not admin).
-	if !isAdmin && finishedSetup {
+	case !isAdmin && finishedSetup:
 		u, err = client.User.
 			Update().Where(user.IDEQ(id)).
 			SetEmail(email).
@@ -268,23 +269,44 @@ func UpdateUserByAdmin(ctx context.Context, client *ent.Client, id uuid.UUID, em
 			SetIsAdmin(isAdmin).
 			SetIsActive(active).
 			Save(ctx)
-	} else {
+
+	default:
 		var digest []byte
 
-		digest, err = passwd.GetHash(password)
-		if err != nil {
+		if digest, err = passwd.GetHash(password); err != nil {
 			log.Errorf("error hashing password: %s", err)
 			return errors.New("could not hash password")
 		}
 
-		u, err = client.User.
-			Update().Where(user.IDEQ(id)).
-			SetEmail(email).
-			SetUsername(username).
-			SetPassword(digest).
-			SetIsAdmin(isAdmin).
-			SetIsActive(active).
-			Save(ctx)
+		var origU *ent.User
+
+		if origU, err = QueryUserByUUID(ctx, client, id); err != nil {
+			return err
+		}
+
+		// handle a situation when an admin account is demoted to a
+		// regular-user level. reset last-login so as to force the user to go
+		// through the initial password change flow.
+		if origU.IsAdmin && !isAdmin {
+			u, err = client.User.
+				Update().Where(user.IDEQ(id)).
+				SetEmail(email).
+				SetUsername(username).
+				SetPassword(digest).
+				SetIsAdmin(isAdmin).
+				SetIsActive(active).
+				SetLastLogin(time.Unix(0, 0)).
+				Save(ctx)
+		} else {
+			u, err = client.User.
+				Update().Where(user.IDEQ(id)).
+				SetEmail(email).
+				SetUsername(username).
+				SetPassword(digest).
+				SetIsAdmin(isAdmin).
+				SetIsActive(active).
+				Save(ctx)
+		}
 	}
 
 	switch {