[ADD] PDF REST AHORA ACEPTA BACKGROUND

src/main/java/web/multitask/trismegistoservices/rest/pdfRest.java

@@ -26,6 +26,7 @@ public class pdfRest {
         try {
             String html;
             String fileName;
+            String background;
             boolean isBase64;
 
             if (json != null && !json.isEmpty()) {
@@ -33,13 +34,19 @@ public class pdfRest {
                 html = jsonBody.getString("html");
                 fileName = jsonBody.optString("file_name", "pdf.pdf");
                 isBase64 = jsonBody.optBoolean("base64");
+                background = jsonBody.has("background") ? jsonBody.getString("background") : null;
             } else {
                 html = params.get("html");
                 fileName = params.getOrDefault("file_name", "pdf.pdf");
                 isBase64 = Boolean.parseBoolean(params.get("base64"));
+                background = params.get("background");
             }
 
-            byte[] bytes = pdfService.generatePdf(html);
+            if (background != null && !background.startsWith("http") && !background.startsWith("data:")) {
+                background = "data:image/png;base64," + background;
+            }
+
+            byte[] bytes = pdfService.generatePdf(html, background);
 
             if (isBase64) {
                 String base64 = commonUtils.byteToBase64(bytes);

src/main/java/web/multitask/trismegistoservices/services/PDFService.java

 package web.multitask.trismegistoservices.services;
 
+import com.itextpdf.io.image.ImageData;
+import com.itextpdf.io.image.ImageDataFactory;
+import org.springframework.stereotype.Service;
 import com.itextpdf.html2pdf.ConverterProperties;
 import com.itextpdf.html2pdf.HtmlConverter;
 import com.itextpdf.html2pdf.resolver.font.DefaultFontProvider;
-import org.springframework.stereotype.Service;
+import com.itextpdf.kernel.colors.DeviceRgb;
+import com.itextpdf.kernel.events.Event;
+import com.itextpdf.kernel.events.IEventHandler;
+import com.itextpdf.kernel.events.PdfDocumentEvent;
+import com.itextpdf.kernel.geom.PageSize;
+import com.itextpdf.kernel.geom.Rectangle;
+import com.itextpdf.kernel.pdf.PdfDocument;
+import com.itextpdf.kernel.pdf.PdfPage;
+import com.itextpdf.kernel.pdf.PdfWriter;
+import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
 
-import java.io.File;
-import java.io.FileOutputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 
 @Service
 public class PDFService {
 
-    public byte[] generatePdf(String htmlContent) throws Exception {
+    public byte[] generatePdf(String htmlContent, String backgroundUrl) throws Exception {
+        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
+            PdfWriter writer = new PdfWriter(baos);
+            PdfDocument pdf = new PdfDocument(writer);
+            pdf.setDefaultPageSize(PageSize.A4);
+
+            // 1. Creamos el estilo CSS para el fondo
+            // Usamos @page para que se aplique a todas las páginas del PDF
+            String backgroundStyle = "<style>" +
+                    "@page {" +
+                    "  margin: 0;" + // Opcional: define márgenes si los necesitas
+                    "  background-image: url('" + backgroundUrl + "');" +
+                    "  background-position: center;" +
+                    "  background-repeat: no-repeat;" +
+                    "  background-size: cover;" +
+                    "}" +
+                    "body { margin: 1cm; }" + // Margen interno para que el texto no toque los bordes
+                    "</style>";
+
+            // 2. Concatenamos el estilo al final (o al inicio) del contenido
+            String finalHtml = htmlContent + backgroundStyle;
+
             ConverterProperties properties = new ConverterProperties();
             DefaultFontProvider fontProvider = new DefaultFontProvider(false, false, false);
             fontProvider.addFont("/fonts/Roboto-Regular.ttf");
             properties.setFontProvider(fontProvider);
-        FileOutputStream outputStream = new FileOutputStream(System.getProperty("java.io.tmpdir") + "/pdf.pdf");
-        HtmlConverter.convertToPdf(htmlContent, outputStream, properties);
-        File file = new File(System.getProperty("java.io.tmpdir") + "/pdf.pdf");
-        return org.apache.commons.io.FileUtils.readFileToByteArray(file);
+
+            // 3. Convertimos (Ya no hace falta el EventHandler manual)
+            HtmlConverter.convertToPdf(finalHtml, pdf, properties);
+
+            pdf.close();
+            return baos.toByteArray();
+        }
     }
 
 }
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