From af3f13773bb06977a64fc5546089a9ca561410c4 Mon Sep 17 00:00:00 2001
From: ricardo051199 <jesus.pelaez@primefactorsolutions.com>
Date: Tue, 24 Sep 2024 19:26:18 -0400
Subject: [PATCH] #29 Perfil de Empleado Administrativo - LISTAR Documentos
 (implementacion de download)

---
 .../views/DocumentsListView.java              | 23 ++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/primefactorsolutions/views/DocumentsListView.java b/src/main/java/com/primefactorsolutions/views/DocumentsListView.java
index 101197d..229d333 100644
--- a/src/main/java/com/primefactorsolutions/views/DocumentsListView.java
+++ b/src/main/java/com/primefactorsolutions/views/DocumentsListView.java
@@ -18,6 +18,7 @@ import jakarta.annotation.security.PermitAll;
 import org.springframework.context.annotation.Scope;
 import org.vaadin.firitin.components.grid.PagingGrid;
 
+import java.util.Base64;
 import java.util.List;
 
 
@@ -52,7 +53,7 @@ public class DocumentsListView extends Main {
         documentGrid.addComponentColumn(this::createEmployeeSpan).setHeader("Employee");
         addDocumentActionColumn("View", this::navigateToDocumentView);
         addDocumentActionColumn("Edit", this::navigateToEditDocumentView);
-        addDocumentActionColumn("Download", this::navigateToDownloadDocumentView);
+        addDocumentActionColumn("Download", this::downloadDocument);
         configurePagination();
     }
 
@@ -136,6 +137,26 @@ public class DocumentsListView extends Main {
                 sortOrder.getDirection() == SortDirection.ASCENDING);
     }
 
+    private void downloadDocument(final Document document) {
+        String base64Data = Base64.getEncoder().encodeToString(document.getFileData());
+        String jsCode = "var byteCharacters = atob('" + base64Data + "');" +
+                "var byteNumbers = new Array(byteCharacters.length);" +
+                "for (var i = 0; i < byteCharacters.length; i++) {" +
+                "    byteNumbers[i] = byteCharacters.charCodeAt(i);" +
+                "}" +
+                "var byteArray = new Uint8Array(byteNumbers);" +
+                "var blob = new Blob([byteArray], { type: 'application/pdf' });" +
+                "var url = URL.createObjectURL(blob);" +
+                "var a = document.createElement('a');" +
+                "a.href = url;" +
+                "a.download = '" + document.getFileName() + "';" +
+                "document.body.appendChild(a);" +
+                "a.click();" +
+                "document.body.removeChild(a);" +
+                "URL.revokeObjectURL(url);";
+        getElement().executeJs(jsCode);
+    }
+
     @FunctionalInterface
     private interface DocumentActionHandler {
         void handle(Document document);