Add validation for empty refresh token in refreshShopToken

[octavebenil]

Fix “Cannot refresh token” in ps_accounts 8.0.4 by preventing empty refresh tokens from being sent and preferring OAuth2 (V7) when the registered version is unknown.

Context

• Versions:

    - 7.2.2: account linking works.
    - 8.0.4: verification/migration fails.
  

• Symptom:

   - POST /v1/shop/token/refresh sent with {"token": ""} → 400 Bad Request “Cannot refresh token”.
  

• Root cause:

  - MigrateOrCreateIdentityV8Handler::getTokenV6OrV7('0', ...) takes the V6 path.
  
  - V6 path reads the legacy refresh token from configuration; it’s missing, resulting in an empty token being sent.
  
  - No guard or fallback existed in 8.0.4.
  

What’s changed

- Prevent HTTP calls with empty refresh tokens.

- Prefer OAuth2 (V7) when registered version is unknown (“0” or empty), fallback to V6 with clear validation.

Technical changes

- AccountsService.php

     - refreshShopToken() :

          - Add early guard for empty refreshToken.

          - Throw AccountsException with error store/empty-refresh-token and a clear message.

    - MigrateOrCreateIdentityV8Handler.php

          - Add use PrestaShop\Module\PsAccounts\Http\Client\Response;.

          - getFirebaseTokenV6() :

                - Validate presence of legacy refresh token in configuration.

                - If missing, throw AccountsException with store/missing-legacy-refresh-token.

        - getTokenV6OrV7() :

               - If version is empty or “0”, try V7 first; on failure, fall back to V6.

              - Keep existing logic for versions >= 7 (V7) and < 7 (V6).

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[hschoenenberger]

@octavebenil Thanks for your contribution 👍
That's a problem we're going to address and we'll consider your fix.

[hschoenenberger]

Fixed with #600 , @octavebenil thanks for your work !