New Participant

Download Document of Record PDF with Form Data with Button In Adaptive Form

Forum|Forum|4 years ago
March 29, 2021
6 replies
4448 views

Hello,

I currently have a use case where the user fills in the adaptive form and should be able to download the Document of Record PDF (XDP template) with the form data by clicking a button. The purpose of this use case is so the entered data is not stored in AEM or a database, so the adaptive form only serves as a form filler.

From my initial findings, there is a Java API you can use to generate the DoR:

https://helpx.adobe.com/experience-manager/6-3/forms/javadocs/com/adobe/aemds/guide/addon/dor/DoRService.html

What would be the best way to implement this API for use in an adaptive form? I would like this to be used for a majority of my forms. Thank you

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G

GirishBedekar

New Participant

Save the pdf to local file system after it is generated

T

techddxAuthor

New Participant

I am testing by saving it to local system first, and the PDF is successfully generated. However, when trying to get the file from button AJAX call, the PDF is corrupt.

G

GirishBedekar

New Participant

Good to know

is the pdf being generated?

T

techddxAuthor

New Participant

The servlet is working and the PDF is being generated with a button ajax call. However the generated PDF is corrupt. Here is my code in the button:

/**
* Get pdf
* @2007960 {OPTIONS} drop down options 
 */
function getPdf()
{
    console.log("in view pdf");
    window.guideBridge.getDataXML(
        {
        	success: function(result) {
             var formData = new FormData();
             formData.append("dataXml",result.data);
			console.log("got data"+result.data);
           	var settings ={
            				"async": true,
							"url": "/bin/streampdf",
							"method": "POST",
                			data:{'data':result.data},
   						}
            $.ajax(settings).done(function(response)
            {
                console.log("got response from POST");
				var file = new Blob([response], {
                type : 'application/pdf'
                });
                var fileURL = URL.createObjectURL(file);

                var a         = document.createElement('a');
                a.href        = fileURL; 
                a.target      = '_blank';
                a.download    = 'form.pdf';
                document.body.appendChild(a);
                a.click();
            })

    	},
    	error:function(guideResultObject) {console.log("got error"); },
        guideState : null,
        boundData  : true});

}

T

techddxAuthor

New Participant

I have created a servlet based on the DoR with API implementation with JSP. However when deploying the bundle, the servlet component is in the "satisfied" state. How can I get it to activate? Below is the servlet code:

public class StreamPDF extends SlingAllMethodsServlet{
	private static final long serialVersionUID = 1L;
	
	@SlingObject
    private ResourceResolver resourceResolver;
	@SlingObject
	private Resource resource;
	
	//OSGi Services
	@Reference
	private com.adobe.aemds.guide.addon.dor.DoRService dorService;
	@Reference
	private GetResolver AEMResourceResolver;
	
	protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException{
	    performTask(request, response);
	  }
	
	protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException{
		performTask(request, response);
	}
	
	private void performTask(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
		try {
			String dataXml = request.getParameter("data");
			// get path to DoR template from xml
			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder;
			builder = factory.newDocumentBuilder();
			org.w3c.dom.Document doc = builder.parse(new InputSource(new StringReader(dataXml)));
			XPath xPath = XPathFactory.newInstance().newXPath();
			String templatePath = xPath.compile("//templatePath").evaluate(doc);
			String formName = xPath.compile("//formName").evaluate(doc);
			
			// get current date for filename
			SimpleDateFormat sdf = new SimpleDateFormat("MM.dd.yy");
			String currentDate = sdf.format(new Date());
			
			// Begin generate DoR
			Session session;
			resourceResolver = AEMResourceResolver.getFormsServiceResolver();
			session = resourceResolver.adaptTo(Session.class);
			resource = resourceResolver.getResource(templatePath);
			// dorService
			com.adobe.aemds.guide.addon.dor.DoROptions dorOptions =  new com.adobe.aemds.guide.addon.dor.DoROptions();
			dorOptions.setData(dataXml);
			dorOptions.setFormResource(resource);
			java.util.Locale locale = new java.util.Locale("en");
			dorOptions.setLocale(locale);
			com.adobe.aemds.guide.addon.dor.DoRResult dorResult = dorService.render(dorOptions);
			byte[] fileBytes = dorResult.getContent();
			com.adobe.aemfd.docmanager.Document dorDocument = new com.adobe.aemfd.docmanager.Document(fileBytes); // DoR
			java.util.Random r1 = new java.util.Random();
			String randomName = Long.toString(Math.abs(r1.nextLong()), 36);
			String fileName = formName + " - " + currentDate + " - " + randomName +".pdf";
			InputStream fileInputStream = dorDocument.getInputStream();
			dorDocument.close();
			response.setContentType("application/pdf");
			response.addHeader("Content-Disposition", "attachment; filename=" + fileName);
			response.setContentLength(fileInputStream.available());
			ServletOutputStream servletOutputStream = response.getOutputStream();
			int bytes;
			while ((bytes = fileInputStream.read()) != -1) {
		        servletOutputStream.write(bytes); 
			}
		      servletOutputStream.flush();
		      servletOutputStream.close();

		} catch (ParserConfigurationException e) {	
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (XPathExpressionException e) {
			e.printStackTrace();
		} catch (DoRGenerationException e) {
			e.printStackTrace();
		}

	}
}

T

techddxAuthor

New Participant

I checked the error log and found this: *ERROR* [FelixDispatchQueue] org.apache.sling.servlets.resolver FrameworkEvent ERROR (org.osgi.framework.ServiceException: Service factory exception: Could not load implementation object class dgs.aem.core.servlets.StreamPDF) org.osgi.framework.ServiceException: Service factory exception: Could not load implementation object class dgs.aem.core.servlets.StreamPDF

Pulkit_Jain_

Employee

@techddx

To stream the pdf back to the browser, you may have to add the below piece here[0].

byte[] byteInfo = dorResult.ToArray();
dorResult.Write(byteInfo, 0, byteInfo.Length);
dorResult.Position = 0;
HttpContext.Response.AddHeader("content-disposition","inline; filename=form.pdf"); //for browser rendering
return new FileStreamResult(dorResult, "application/pdf");

[0] - https://experienceleague.adobe.com/docs/experience-manager-learn/forms/adaptive-forms/document-of-record-api-tutorial-use.html?lang=en#adaptive-forms

T

techddxAuthor

New Participant

Hi @pulkit_jain_, thank you for your help.

I added the following code to the POST.jsp, but the PDF download is not appearing in the browser. I checked the logs and there are no errors either.

	Session session;
    com.adobe.aemds.guide.addon.dor.DoRService dorService = sling.getService(com.adobe.aemds.guide.addon.dor.DoRService.class);
	System.out.println("Got ... DOR Service");
	com.mergeandfuse.getserviceuserresolver.GetResolver aemDemoListings = sling.getService(com.mergeandfuse.getserviceuserresolver.GetResolver.class);
	System.out.println("Got aem DemoListings");
	resourceResolver = aemDemoListings.getFormsServiceResolver(); // used to resolve the template path
	session = resourceResolver.adaptTo(Session.class);
	resource = resourceResolver.getResource(templatePath);
	com.adobe.aemds.guide.addon.dor.DoROptions dorOptions =  new com.adobe.aemds.guide.addon.dor.DoROptions();
	dorOptions.setData(dataXml);
	dorOptions.setFormResource(resource);
	java.util.Locale locale = new java.util.Locale("en");
	dorOptions.setLocale(locale);
	com.adobe.aemds.guide.addon.dor.DoRResult dorResult = dorService.render(dorOptions);
	byte[] fileBytes = dorResult.getContent();
	com.adobe.aemfd.docmanager.Document dorDocument = new com.adobe.aemfd.docmanager.Document(fileBytes); // DoR

	// Output Service Testing
	java.util.Random r1 = new java.util.Random();
	String randomName = Long.toString(Math.abs(r1.nextLong()), 36);
	String fileName = formName + " - " + currentDate + " - " + randomName +".pdf";
	File pdfFile = new File(fileName);
	dorDocument.copyToFile(pdfFile);
	response.setContentType("application/octet-stream");
	response.setContentLength((int) pdfFile.length());
	response.setHeader( "Content-Disposition",String.format("inline; filename=\"%s\"", pdfFile.getName()));
	FileInputStream fis = new FileInputStream(pdfFile);
	byte[] buffer = new byte[(int)pdfFile.length()];
	fis.close();
	ServletOutputStream os = response.getOutputStream();
    os.write(buffer);
    os.close();

Pulkit_Jain_

Employee

@techddx Please refer to the snippet provided here[0].

This sample uses the same "com.adobe.aemds.guide.addon.dor.DoROptions" class you were referring previously. This help doc also provides relevant packages/configs, so should suffice your requirement.

[0] - https://experienceleague.adobe.com/docs/experience-manager-learn/forms/adaptive-forms/document-of-record-api-tutorial-use.html?lang=en#adaptive-forms

T

techddxAuthor

New Participant

Hi @pulkit_jain_, thank you for this document. I tried the sample implementation, but found the resulting PDF is saved in the AEM CRX under "/content/usergenerated/content/aemformsenablement". Is there a way to only provide the download to the PDF, and not save the PDF within AEM CRX?

W

workflowuser

Employee

I will get back to you on this

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