Fix case where user can get stuck in a deleted organization if they were prev logged into it

backend/src/services/auth-token/auth-token-service.ts

@@ -1,4 +1,5 @@
 import crypto from "node:crypto";
+import jwt from "jsonwebtoken";
 
 import bcrypt from "bcrypt";
 import { Knex } from "knex";
@@ -8,7 +9,7 @@ import { getConfig } from "@app/lib/config/env";
 import { ForbiddenRequestError, NotFoundError, UnauthorizedError } from "@app/lib/errors";
 import { TOrgMembershipDALFactory } from "@app/services/org-membership/org-membership-dal";
 
-import { AuthModeJwtTokenPayload } from "../auth/auth-type";
+import { AuthModeJwtTokenPayload, AuthModeRefreshJwtTokenPayload, AuthTokenType } from "../auth/auth-type";
 import { TUserDALFactory } from "../user/user-dal";
 import { TTokenDALFactory } from "./auth-token-dal";
 import { TCreateTokenForUserDTO, TIssueAuthTokenDTO, TokenType, TValidateTokenForUserDTO } from "./auth-token-types";
@@ -100,6 +101,40 @@ export const tokenServiceFactory = ({ tokenDAL, userDAL, orgMembershipDAL }: TAu
     return token;
   };
 
+  const validateRefreshToken = async (refreshToken?: string) => {
+    const appCfg = getConfig();
+    if (!refreshToken)
+      throw new NotFoundError({
+        name: "AuthTokenNotFound",
+        message: "Failed to find refresh token"
+      });
+
+    const decodedToken = jwt.verify(refreshToken, appCfg.AUTH_SECRET) as AuthModeRefreshJwtTokenPayload;
+
+    if (decodedToken.authTokenType !== AuthTokenType.REFRESH_TOKEN)
+      throw new UnauthorizedError({
+        message: "The token provided is not a refresh token",
+        name: "InvalidToken"
+      });
+
+    const tokenVersion = await getUserTokenSessionById(decodedToken.tokenVersionId, decodedToken.userId);
+
+    if (!tokenVersion)
+      throw new UnauthorizedError({
+        message: "Valid token version not found",
+        name: "InvalidToken"
+      });
+
+    if (decodedToken.refreshVersion !== tokenVersion.refreshVersion) {
+      throw new UnauthorizedError({
+        message: "Token version mismatch",
+        name: "InvalidToken"
+      });
+    }
+
+    return { decodedToken, tokenVersion };
+  };
+
   const validateTokenForUser = async ({
     type,
     userId,
@@ -183,6 +218,7 @@ export const tokenServiceFactory = ({ tokenDAL, userDAL, orgMembershipDAL }: TAu
 
   return {
     createTokenForUser,
+    validateRefreshToken,
     validateTokenForUser,
     getUserTokenSession,
     clearTokenSessionById,