[IS 7.0.0] [IS 7.1.0] Issue in sending null values in DCR response

[Ashi1993]

Description

DCR endpoint response back the null values in response, but according to rest practises it should not respond with null values. Hence added a fix to remove null values from the response.

Sample response

{
    "client_id": "k5oVUUCvQEbbkvbP20W6JKHUnMca",
    "client_secret": "HL0ErWBQ5lh3W5r3nwWYHkGVTWdXBP3zjFJrwgbhf5Ea",
    "client_secret_expires_at": 0,
    "redirect_uris": [
        "https://www.google.com/redirects/redirect1"
    ],
    "grant_types": [
        "authorization_code",
        "client_credentials",
        "refresh_token"
    ],
    "client_name": "WSO2_Open_Banking_TPP__Sandbox_",
    "ext_application_display_name": "WSO2_Open_Banking_TPP__Sandbox_",
    "ext_application_version": "v2.0.0",
    "ext_application_owner": "[email protected]@carbon.super",
    "ext_application_token_lifetime": 3600,
    "ext_user_token_lifetime": 3600,
    "ext_refresh_token_lifetime": 86400,
    "ext_id_token_lifetime": 3600,
    "ext_pkce_mandatory": false,
    "ext_pkce_support_plain": false,
    "ext_public_client": false,
    "token_type_extension": "JWT",
    "ext_token_type": "JWT",
    "jwks_uri": "https://keystore.openbankingtest.org.uk/0015800001HQQrZAAX/9ZzFFBxSLGEjPZogRAbvFd.jwks",
    "token_endpoint_auth_method": "private_key_jwt",
    "token_endpoint_allow_reuse_pvt_key_jwt": false,
    "token_endpoint_auth_signing_alg": "PS256",
    "sector_identifier_uri": null,
    "id_token_signed_response_alg": "PS256",
    "id_token_encrypted_response_alg": "RSA-OAEP",
    "id_token_encrypted_response_enc": "A256GCM",
    "request_object_signing_alg": "PS256",
    "tls_client_auth_subject_dn": null,
    "require_pushed_authorization_requests": false,
    "require_signed_request_object": true,
    "tls_client_certificate_bound_access_tokens": true,
    "subject_type": "public",
    "request_object_encryption_alg": null,
    "request_object_encryption_enc": null,
    "software_statement": "eyJhbGciOiJQUzI1NiIsImtpZCI6IkJrSHhlSUhLeU1LRjZTZ0d3cVl6TFV2VFFmayIsInR5cCI6IkpXVCJ9.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.qg-osLndAcSkVxgUQ6FovJjsthVgL64P-h6K1o6sEKgAfEPP138JZj7_n8T6qobRhL9HfRikBVERHa72lsDM_NZNMvsKGmILYBXIM4mSm6BzT-EZ8LTyBZnIpfX5G8BY9BTKY_Rs1K1TgbE_kKnl0tTx9EZRoLgcgbVBmMqathyz7flzyIGczF-Z8bXPKKSjrr6C7W3aQEZykH-GkiyqgJ-9TBNMvMq8HFpSE_SkTPaBJ_IWMvf5zgsFyK9QwpaSfrMFeD2M5K0kkTQEEobQ31ytjPLIayL4L_MP-QMwZMzPdzDdAr7ryfmFzNDWkfBwYiBY4B0ZVzoP2wOIe6wZAA",
    "ext_allowed_audience": "organization",
    "software_id": "9ZzFFBxSLGEjPZogRAbvFd",
    "application_type": "web",
    "scope": "accounts payments fundsconfirmations",
    "response_types": [
        "code id_token"
    ]
}

Steps to Reproduce

Send a DCR Request with the below and check the response

{

  "client_name": "WSO2 Open Banking TPP2 Sandbox",
  "iss": "oQ4KoaavpOuoE7rvQsZEOV",
  "iat": 1743051932595,
  "exp": 1743311132596,
  "jti": "1743051932596",
  "aud": "https://localbank.com",
  "software_id": "oQ4KoaavpOuoE7rvQsZEOV",
  "scope": "accounts payments fundsconfirmations",
  "redirect_uris": [
    "https://www.google.com/redirects/redirect1"
  ],
  "token_endpoint_auth_signing_alg": "PS256",
  "token_endpoint_auth_method": "private_key_jwt",
  "grant_types": [
    "authorization_code",
    "client_credentials",
    "refresh_token"
  ],
  "response_types": [
    "code id_token"
  ],
  "application_type": "web",
  "id_token_signed_response_alg": "PS256",
  "id_token_encrypted_response_alg": "RSA-OAEP",
  "id_token_encrypted_response_enc": "A256GCM",
  "request_object_signing_alg": "PS256",
  "software_statement": "eyJhbGciOiJQUzI1NiIsImtpZCI6ImNJWW8tNXpYNE9UV1pwSHJtbWlaRFZ4QUNKTSIsInR5cCI6IkpXVCJ9.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.VnfXrppGmCcYGWLcmT3gB22r297Vc0ppibLrl0mv8PGkb7oZLEkIqaAdz9OBwFjehDiHlIzOrCzNgzJD5GvyacZSiorFkpzBpbV80q-n_-uFTugE7mrCVnNfTsb1SBEdoWCRn_BbzH-T2YstqLWPhb_fHkDSFTGJeSnFGp1EcMXVmx8P-pCgsoTS-kXEPDXD7F4iZjZwcFfxDpe_N8FvAUC28l3Tzm1au4bLjrI0T94PVoEJEmAk9AU_somFy_XEvuKuuULfccW3CDR6KGbvXV7MVPNA5XTT5g_H9bRxcPX4ZaaWfIaRVfZ28d_ZCRtsUIiLgm_6eZkiD-7Eh3qyVQ",
    "token_type_extension": "JWT",
    "require_signed_request_object": true,
    "tls_client_certificate_bound_access_tokens": true,
    "token_endpoint_allow_reuse_pvt_key_jwt": false
}

Version

7.0.0, 7.1.0

Environment Details (with versions)

No response