[SalesForce] How to download file – lightning component

I developed custom files section using lightning components.

I am trying to download file from ligtning component, but not able to find solution.

Piece of component code:

 <aura:attribute name="Baseurl" type="String" />

<a href="" data-id="{!account.acc.ContentDocumentId}"  onclick = "{!c.downloadfile}" >Download</a>

Controller.JS 

downloadfile : function (component, event, helper){                 
    var id = event.target.getAttribute("data-id");       
    alert('Document ID:' +id);
    var actiondownload = component.get("c.DownloadAttachment");

    actiondownload.setParams({
        "DownloadAttachmentID": id
    });

      actiondownload.setCallback(this, function(b){
        component.set("v.Baseurl", b.getReturnValue());


    });

Apex COntroller

     public static string DownloadAttachment(Id DownloadAttachmentID)
   {
    ContentVersion oldCV = [Select Id,Title,Locked__c,Locked_By__c from ContentVersion Where ContentDocumentId=:DownloadAttachmentID and IsLatest = true ];
    System.Debug('Old LV INitial :'+ oldCV.Id);
    System.Debug('Old Lock :'+ oldCV.Locked__c);
    String fullFileURL = URL.getSalesforceBaseUrl().toExternalForm();
    String URlDownload = fullFileURL+'/sfc/servlet.shepherd/version/download/'+oldCV.Id;
    system.debug('Download URL:' +URlDownload);
    return URlDownload;
    }

Below is the piece of code used in classic salesforce

pagereference newTab=new pagereference('/sfc/servlet.shepherd/version/download/'+oldCV.Id+'?asPdf=false&operationContext=CHATTER');
        newTab.setRedirect(true);
        return (newTab);

i cannot use "pagereference" in @auraenabled. Is there any other option to download files from Apex controller ?

Thanks.

Best Regards
Visu

Best Answer

After the discussion in the comments of the question, here is how you can use navigateToURL event. Update your setCallBack to this.

actiondownload.setCallback(this, function(b){
        component.set("v.Baseurl", b.getReturnValue());
var urlEvent = $A.get("e.force:navigateToURL");
    urlEvent.setParams({
      "url": b.getReturnValue()
    });
    urlEvent.fire();
}
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