How to Delete Pages from PDF in Salesforce using PDF.co

Step 1: Remote Site Settings

Create two remote site settings in the Salesforce like below. The first setting is for the variable name “tempFilesAWS” which will hold the value “https://pdf-temp-files.s3.amazonaws.com”.

Next will be for the variable name “pdfAPI” which will hold PDF.co API base URL “https://api.pdf.co”.

Step 2: Create APEX Class

In this step, we’ll be creating an APEX class in salesforce. For that, we have to open the “Developer Console”.

Developer Console can be opened by clicking on the setting icon in the top right corner.

Now that we have “Developer Console” open, we can create an apex class from the “File => New => Apex Class” menu.

We can name the apex class as “DeletePagesFromPDF” and click “OK”.

Here, we will write the Apex source code which will perform the deletion of PDF pages. The source code is as follows.

public class DeletePagesFromPdf {
    
    String API_KEY = '*****************';    
    string DestinationFile = 'resultPDF';    
    string endPointUrl = 'https://api.pdf.co/v1/pdf/edit/delete-pages';
    
    public void deletePageFromPdf()
    {
        String jsonBody = '{ "url": "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-split/sample.pdf", "pages": "1-2", "name": "result.pdf", "async": false }';
        Http http = new Http();
        HttpRequest request = new HttpRequest();            
        request.setHeader('x-api-key', API_KEY);
        request.setEndpoint(endPointUrl);            
        request.setHeader('Content-Type', 'application/json');
        request.setMethod('POST');
        request.setBody(jsonBody);            
        HttpResponse response =  http.send(request);            
        Map<String, Object> json = (Map<String, Object>)JSON.deserializeUntyped(response.getBody());
        try
        {
            if(response.getStatusCode() == 200) 
            {
                if ((Boolean)json.get('error') == false)
                {
                    System.debug('response.getBody() :: '+response.getBody());
                    // Get URL of generated PDF file
                    String resultFileUrl =(String)json.get('url');
                    // Download generated PDF file
                    downloadFile(resultFileUrl, DestinationFile);
                    System.debug('Generated PDF file saved as \'{0}\' file.'+ DestinationFile);
                }
            }
            else
            {
                System.debug('Error Response ' + response.getBody());
                System.Debug(' Status ' + response.getStatus());
                System.Debug(' Status Code' + response.getStatusCode());
                System.Debug(' Response String' + response.toString());
            }   
        }
        catch (Exception ex)
        {
            String errorBody = 'Message: ' + ex.getMessage() + ' -- Cause: ' + ex.getCause() + ' -- Stacktrace: ' + ex.getStackTraceString();
            System.Debug(errorBody);
        }
    }
    
    @TestVisible
    private static void downloadFile(String extFileUrl, String DestinationFile)
    {
        Http h = new Http(); 
        HttpRequest req = new HttpRequest(); 
        extFileUrl = extFileUrl.replace(' ', '%20'); 
        req.setEndpoint(extFileUrl); 
        req.setMethod('GET'); 
        req.setHeader('Content-Type', 'application/pdf');
        req.setCompressed(true); 
        req.setTimeout(60000); 
        //Now Send HTTP Request
        HttpResponse res  = h.send(req); 
        if(res.getStatusCode() == 200) 
        {
            blob fileContent = res.getBodyAsBlob();
            ContentVersion conVer = new ContentVersion();
            conVer.ContentLocation = 'S'; // to use S specify this document is in Salesforce, to use E for external files
            conVer.PathOnClient = DestinationFile + '.pdf'; // The files name, extension is very important here which will help the file in preview.
            conVer.Title = DestinationFile; // Display name of the files
            conVer.VersionData = fileContent;
            insert conVer;
            System.Debug('Success');
        }
        else
        {
            System.debug('Error Response ' + res.getBody());
            System.Debug(' Status ' + res.getStatus());
            System.Debug(' Status Code' + res.getStatusCode());
            System.Debug(' Response String' + res.toString());
        }
    }
}

Please note that we have to replace the value of the “API_KEY” variable with PDF.co API Key. As you have noticed in the source code, the PDF.co API key is passed in the request header. This API key is useful for the authentication of PDF.co requests.

This API Key can be obtained by signing up at PDF.co.

Like we created the main apex class for “DeletePagesFromPDF”, we can also create a test apex class named “DeletePagesFromPdfTest”. In this test class, we can write the following unit test code.

@isTest
private class DeletePagesFromPdfTest {

    private testmethod static void testdeletePageFromPdf()
    {
        Test.setMock(HttpCalloutMock.class, new DeletePagesFromPdfTest.DeletePageMock());
        (new DeletePagesFromPdf()).deletePageFromPdf();
        List cv = [select Id, VersionData from ContentVersion];
        System.assertEquals(1, cv.size());        
    }
    
    private  testmethod static void testdeletePageFromPdfException()
    {
        Test.setMock(HttpCalloutMock.class, new DeletePagesFromPdfTest.DeletePageMockForExp());
        (new DeletePagesFromPdf()).deletePageFromPdf();
        List cv = [select Id from ContentVersion];
        System.assertEquals(0, cv.size());
    }    
    
    public class DeletePageMock implements HttpCalloutMock {
        public HTTPResponse respond(HTTPRequest req) {
            HttpResponse res = new HttpResponse();
            String testBody = '{ "url": "https://pdf-temp-files.s3.amazonaws.com/d15e5b2c89c04484ae6ac7244ac43ac2/result.pdf", "pageCount": 2, "error": false, "status": 200, "name": "result.pdf", "remainingCredits": 60100 } ';
            res.setHeader('Content-Type', 'application/json');
            res.setBody(testBody);
            res.setStatusCode(200);
            return res;
        }
    }
    
    public class DeletePageMockForExp implements HttpCalloutMock {
        public HTTPResponse respond(HTTPRequest req) {
            HttpResponse res = new HttpResponse();
            String testBody = '{ "url1111": "https://pdf-temp-files.s3.amazonaws.com/d15e5b2c89c04484ae6ac7244ac43ac2/result.pdf", "pageCount": 2, "error": false, "status": 200, "name": "result.pdf", "remainingCredits": 60100 } ';
            res.setHeader('Content-Type', 'application/json');
            res.setBody(testBody);
            res.setStatusCode(200);
            return res;
        }
    }
}

Step 3: Test Code

Up to this step, we have written all source code. We’ll be proceeding with testing it now. Open the execute anonymous window and write executor code there.

DeletePagesFromPdf obj = new DeletePagesFromPdf();
obj.deletePageFromPdf();

Click on the “Execute” button which will run the source code.

Step 4: Verify Code

Let’s verify how the source code works. This code will eventually create a new PDF with deleted pages, hence we need to check the newly created file. Open “Files” from “App Launcher”.

In the file listing window, we’re able to find the result PDF file.