PDFEngineAPI/BlackRock.Reporting.API/Controllers/PDFGeneratorController.cs

using System.Web;
using AutoMapper;
using BlackRock.Reporting.API.Core;
using BlackRock.Reporting.API.Core.Models;
using Microsoft.AspNetCore.Mvc;
using PuppeteerSharp;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace BlackRock.Reporting.API.Controllers
{
    [Route("api/[controller]")]
    public class PDFGeneratorController : Controller
    {
        private readonly IHostEnvironment host;
        private readonly IGenerator generator;
        private readonly IMapper mapper;

        public PDFGeneratorController(IHostEnvironment host, IGenerator generator, IMapper mapper)
        {
            this.mapper = mapper;
            this.generator = generator;
            this.host = host;
        }

        [HttpGet("{url}")]
        public async Task<IActionResult> Get([FromQuery] OptionsForPdf pdfOptions, string url = "http://localhost:3000/#/dashboard")
        {
            if (string.IsNullOrEmpty(url))
                return BadRequest();

            var result = HttpUtility.UrlDecode(url);
            // Temporary name of file which will be downloaded
            var fileName = Guid.NewGuid().ToString() + ".pdf";
            // Path to wwwroot folder combined with name of pdf file
            string path = Path.Combine(host.ContentRootPath, $"wwwroot/pdfs/{fileName}");

            var options = mapper.Map<OptionsForPdf, PdfOptions>(pdfOptions);

            await generator.Generate(result, path, options);

            // Document document = new Document(PageSize.A4, 36, 36, 36 + 100, 36); // note height should be set here
            // MyEvent e = new MyEvent(host);
            // PdfWriter pw = PdfWriter.GetInstance(document, new FileStream(Path.Combine(host.ContentRootPath, "logtest.pdf"), FileMode.Create));
            // pw.PageEvent = e;
            // document.Open();

            // for (int i = 0; i < 100; i++)
            // {
            //     document.Add(new Phrase("TESTING\n"));
            // }

            // document.Close();

            var pixels = CalculatePixels(options.MarginOptions.Top);
            ModifyPDF(path, pixels);
            FileStream stream = new FileStream(path, FileMode.Open);
            return File(stream, "application/pdf", fileName);
        }

        private double CalculatePixels(string v)
        {
            float Result;
            if(float.TryParse(v,out Result))
                return 2.83*Result;
            var num = float.Parse(v.Split(' ')[0]);
            return 2.83*num;
        }

        [HttpGet("isolate/{url}")]
        public async Task<IActionResult> GetIsolated([FromQuery] OptionsForPdf pdfOptions, string url = "http://localhost:3000/#/dashboard")
        {
            if (string.IsNullOrEmpty(url))
                return BadRequest();

            var result = HttpUtility.UrlDecode(url);
            // Temporary name of file which will be downloaded
            var fileName = Guid.NewGuid().ToString() + ".pdf";
            // Path to wwwroot folder combined with name of pdf file
            string path = Path.Combine(host.ContentRootPath, $"wwwroot/pdfs/{fileName}");

            var options = mapper.Map<OptionsForPdf, PdfOptions>(pdfOptions);

            await generator.Isolate(result, path, options);

            var pixels = CalculatePixels(options.MarginOptions.Top);
            ModifyPDF(path, pixels);


            FileStream stream = new FileStream(path, FileMode.Open);
            return File(stream, "application/pdf", fileName);
        }

        private void Nesto()
        {
            //string oldFile = Path.Combine(host.ContentRootPath, "0bd7e2f4-b01e-4c17-8f1e-99562d2bab4a.pdf");
            string oldFile = Path.Combine(host.ContentRootPath, "oldFile.pdf");
            string newFile = Path.Combine(host.ContentRootPath, "newFilxex.pdf");

            // open the reader
            PdfReader reader = new PdfReader(oldFile);
            Rectangle size = reader.GetPageSizeWithRotation(1);
            Document document = new Document(size);

            AcroFields form = reader.AcroFields;
            try
            {
                for (int pagew = 1; pagew <= reader.NumberOfPages; pagew++)
                {

                }
            }
            catch { }

            // open the writer
            FileStream fs = new FileStream(newFile, FileMode.Create, FileAccess.Write);
            PdfWriter writer = PdfWriter.GetInstance(document, fs);
            document.Open();

            // the pdf content
            PdfContentByte cb = writer.DirectContent;

            // select the font properties
            BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
            cb.SetColorFill(BaseColor.DARK_GRAY);
            cb.SetFontAndSize(bf, 8);

            // write the text in the pdf content
            cb.BeginText();
            string text = "Some random blablablabla...";
            // put the alignment and coordinates here
            cb.ShowTextAligned(1, text, 520, 640, 0);
            cb.EndText();
            cb.BeginText();
            text = "Other random blabla...";
            // put the alignment and coordinates here
            cb.ShowTextAligned(2, text, 100, 200, 0);
            cb.EndText();

            // create the new page and add it to the pdf
            PdfImportedPage page = writer.GetImportedPage(reader, 1);
            var pages = reader.GetPageN(1);
            var content = writer.DirectContent;
            var template = content.CreateTemplate(100, 100);
            float width = 100, height = 100;
            // PdfDictionary 
            // pages.CreateTemplate(writer,100,100);
            // cb.AddTemplate(page, 0, 0);
            // cb.AddTemplate()
            // Document document = new Document(PageSize.A4, 36, 36, 36 + 100, 36); // note height should be set here
            MyEvent e = new MyEvent(host);
            //PdfWriter pw = PdfWriter.GetInstance(document, new FileStream(Path.Combine(host.ContentRootPath, "logtest.pdf"), FileMode.Create));
            writer.PageEvent = e;
            document.Open();

            // for (int i = 0; i < 100; i++)
            // {
            //     document.Add(new Phrase("TESTING\n"));
            // }

            //document.Close();
            // close the streams and voilá the file should be changed :)
            document.Close();
            fs.Close();
            writer.Close();
            reader.Close();
        }

        private void ModifyPDF(string path,double marginTop)
        {
            var filePath = path;
            byte[] bytes = System.IO.File.ReadAllBytes(filePath);
            var pdfReader = new PdfReader(bytes);
            using (Stream output = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None))
            {
                using (PdfStamper pdfStamper = new PdfStamper(pdfReader, output))
                {
                    for (int pageIndex = 1; pageIndex <= pdfReader.NumberOfPages; pageIndex++)
                    {
                        pdfStamper.FormFlattening = false;
                        Rectangle pageRectangle = pdfReader.GetPageSizeWithRotation(pageIndex);
                        PdfContentByte pdfData = pdfStamper.GetOverContent(pageIndex);
                        pdfData.SetFontAndSize(BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 10);
                        PdfGState graphicsState = new PdfGState
                        {
                            FillOpacity = 0.3F
                        };
                        pdfData.SetGState(graphicsState);
                        Image image = Image.GetInstance(Path.Combine(host.ContentRootPath, "logo.png"));
                        var OriginalWidth = image.Width;
                        var OriginialHeight = image.Height;
                        var scale = OriginalWidth/OriginialHeight;
                        OriginialHeight = (float)marginTop-5;
                        OriginalWidth = OriginialHeight*scale;
                        image.ScaleAbsoluteWidth(OriginalWidth);
                        image.ScaleAbsoluteHeight(OriginialHeight);
                        image.SetAbsolutePosition(5,pageRectangle.Height-OriginialHeight-5);
                        pdfData.AddImage(image);
                        // pdfData.BeginText();
                        

                        // // select the font properties
                        // BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
                        // pdfData.SetColorFill(BaseColor.BLACK);
                        // pdfData.SetFontAndSize(bf, 8);

                        // write the text in the pdf content
                        // pdfData.BeginText();
                        // string text = "Faisal Pathan";
                        // // put the alignment and coordinates here
                        // pdfData.ShowTextAligned(1, text, 70, 775, 0);
                        // pdfData.EndText();

                        // pdfData.BeginText();
                        // string text1 = "faisalmpathan@gmail.com";
                        // pdfData.ShowTextAligned(1, text1, 550, 775, 0);
                        // pdfData.ShowTextAligned(0,"logo",pageRectangle.Width/2,pageRectangle.Height-15,0);
                        // pdfData.EndText();

                       
                    }
                }
                output.Close();
                output.Dispose();
            }            
        }
    }
    public partial class MyEvent : PdfPageEventHelper
    {
        public MyEvent(IHostEnvironment host)
        {
            this.host = host;
        }
        iTextSharp.text.Image image1;
        PdfPTable header = new PdfPTable(3);
        private readonly IHostEnvironment host;

        public override void OnOpenDocument(PdfWriter writer, Document document)
        {
            image1 = Image.GetInstance(Path.Combine(host.ContentRootPath, "logo.png"));

            image1.SetAbsolutePosition(20, (document.PageSize.Height - 120));

            //header.WriteSelectedRows(0, -1, document.Left, document.Top, writer.DirectContent);

        }

        public override void OnEndPage(PdfWriter writer, Document document)
        {


            PdfPTable tbHeader = new PdfPTable(1);

            tbHeader.AddCell(image1);
            //tbHeader.TotalWidth = image1.Width;
            // tbHeader.WriteSelectedRows(0, -1, 10, document.PageSize.Height - 15, writer.DirectContent);
            tbHeader.WriteSelectedRows(0, -1, document.PageSize.Width / 2 - image1.Width / 2, document.PageSize.Height - 15, writer.DirectContent);
        }
    }
}