Apexを用いたファイルダウンロード方法の制御について

public class ContentDownloadHandlerFactoryImpl implements Sfc.ContentDownloadHandlerFactory {

    public Sfc.ContentDownloadHandler getContentDownloadHandler(List<ID> ids, Sfc.ContentDownloadContext context) {
        Sfc.ContentDownloadHandler contentDownloadHandler = new Sfc.ContentDownloadHandler();
        //ダウンロード禁止
        contentDownloadHandler.isDownloadAllowed = false;
        //禁止のエラーメッセージ
        contentDownloadHandler.downloadErrorMessage = 'ファイルダウンロード全般禁止します！';
        return contentDownloadHandler;
    }

}

public class ContentDownloadHandlerFactoryImpl implements Sfc.ContentDownloadHandlerFactory {

    public Sfc.ContentDownloadHandler getContentDownloadHandler(List<ID> ids, Sfc.ContentDownloadContext context) {
        Sfc.ContentDownloadHandler contentDownloadHandler = new Sfc.ContentDownloadHandler();
        //モバイルデバイス判定
        if(context == Sfc.ContentDownloadContext.MOBILE) {
            //モバイルデバイスの場合はダウンロード禁止
            contentDownloadHandler.isDownloadAllowed = false;
            contentDownloadHandler.downloadErrorMessage = 'モバイルデバイスではダウンロード禁止です！';
            return contentDownloadHandler;
        }
        //モバイル以外はダウンロード許可
        contentDownloadHandler.isDownloadAllowed = true;
        return contentDownloadHandler;
    }

}

// Allow customization of the content Download experience
public class ContentDownloadHandlerFactoryImpl implements Sfc.ContentDownloadHandlerFactory {

public Sfc.ContentDownloadHandler getContentDownloadHandler(List<ID> ids, Sfc.ContentDownloadContext context) {
    Sfc.ContentDownloadHandler contentDownloadHandler = new Sfc.ContentDownloadHandler();

    if(UserInfo.getUserId() == '005xx') {
        contentDownloadHandler.isDownloadAllowed = true;
        return contentDownloadHandler;
    }
    
    contentDownloadHandler.isDownloadAllowed = false;
    contentDownloadHandler.downloadErrorMessage = 'This file needs to be IRM controlled. You're not allowed to download it';
    contentDownloadHandler.redirectUrl ='/apex/IRMControl?Id='+ids.get(0);
    return contentDownloadHandler;
}
}

public class IRMController {
    
private String downloadEndpoint;
    
public IRMController() {
    downloadEndpoint = '';
}
    
public void applyIrmControl() {
    String versionId = ApexPages.currentPage().getParameters().get('id');
    Http h = new Http();

    //Instantiate a new HTTP request, specify the method (GET) as well as the endpoint
    HttpRequest req = new HttpRequest();
    req.setEndpoint('http://irmsystem?versionId=' + versionId);
    req.setMethod('GET');

    // Send the request, and retrieve a response
    HttpResponse r = h.send(req);
    JSONParser parser = JSON.createParser(r.getBody());
      while (parser.nextToken() != null) {
        if ((parser.getCurrentToken() == JSONToken.FIELD_NAME) &&
            (parser.getText() == 'downloadEndpoint')) {
                parser.nextToken();
                downloadEndpoint = parser.getText();
                break;
        }
    }
}
    
public String getDownloadEndpoint() {
    return downloadEndpoint;
}
    
}