Get all the User Claims in the user profile using the SPI

Getting advice
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I am creating a keycloak SPI, where I want to get userprofile which contains- user details, user Roles, user Permissions and user claims {oicd claims, resource related claims, roles/permission claims, user attributes, custom attributes}. but I am unable to find out the class through which I can extract claims for the SPI. How to do it. please provide me the class using which I can get all the user claims,
I have followed an approach but it is not working -

public Map<String, String> getClaims(UserModel user) {
Map<String, String> claims = new HashMap<>();

    AuthorizationRequest request = new AuthorizationRequest();
    Map<String, List<String>> originalClaims = request.getClaims(); 
    log.info("originalClaims: " + originalClaims);
    originalClaims.forEach((key, values) -> {
        log.info("key: " + key + ", values: " + values);
        String value = values.isEmpty() ? null : values.get(0); 
        claims.put(key, value);
    });
    log.info("claims: " + claims);
    return claims;
}