@Override
    public boolean isEnabled() {
        ExternalContext ctx = FacesContext.getCurrentInstance().getExternalContext();
        return ctx.getInitParameter(CONTEXT_PARAM_KEY) != null;
    }
This is the default {@link VirusScanner} provider bundled with PrimeFaces.
The implementation makes use of the <a href="https://developers.virustotal.com/reference">VirusTotal Public API v2.0</a>.
It requires {@link #CONTEXT_PARAM_KEY} to be specified.
primefaces/src/main/java/org/primefaces/virusscan/impl/VirusTotalReportScanner.java