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Showing posts from January, 2022

Making vanilla web-fontend (project with lit, web component) secured (discussions with chatGpt)

Query: I wn complete seperate .css/.scss and .html template file for my webcomponent.js like in angular. But with complete security. In lit. Use any js lib like domPurify, etc. But I wan complete safety. How? ChatGPT said: Thought for 16s Totally doable. Here’s a secure Lit setup with fully separate .html + .scss files , sanitized with DOMPurify , and rendered into the Shadow DOM without sacrificing performance. Folder layout src / lib/ safe- html .js components/ app-shell .html app-shell .scss app-shell .js 1) Install deps npm i dompurify npm i -D sass Vite will compile .scss . We’ll import the compiled CSS as text and attach it via adoptedStyleSheets (fast + memory-friendly). 2) app-shell.html (pure template file) Put your Carbon UI Shell markup here (no scripts). Example stub: < cds-header aria-label = "My App" > < cds-header-name prefix = "IBM" >[Platform] </ cds-header-name > < cds-header-glo...
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Notes: Java module to create Zipped Folder from list of Files

private static void convertFilesToZip(ArrayList filePaths, String zipFilePath) throws Exception { try ( ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFilePath));) { for (String filePath : filePaths) { File fileToZip = new File(filePath); ZipEntry e = new ZipEntry(new File(filePath).getName()); out.putNextEntry(e); Files.copy(fileToZip.toPath(), out); } } }
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Notes: Java module to convert list of images to PDF document using Apache PDFBox

 private static void convertImagesToPdf(ArrayList<String> imagesFilePath, String pdfFilePath) throws Exception {         try ( PDDocument doc = new PDDocument();) {             for (String imageFilePath : imagesFilePath) {                 PDImageXObject image = PDImageXObject.createFromFile(imageFilePath, doc);                 PDRectangle pageSize = PDRectangle.A4;                 int originalWidth = image.getWidth();                 int originalHeight = image.getHeight();                 float pageWidth = pageSize.getWidth();                 float pageHeight = pageSize.getHeight();                 float ratio = Math.min(pageWidth / originalWidth, page...
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Notes: Java module to merge PDF Documents (with or without password)

import java.io.File; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.time.LocalDate; import java.time.YearMonth; import java.time.format.DateTimeFormatter; import java.time.format.DateTimeFormatterBuilder; import java.util.ArrayList; import java.util.Collections; import java.util.NavigableMap; import java.util.TreeMap; import org.apache.commons.io.FileUtils; import org.apache.commons.lang3.StringUtils; import org.apache.pdfbox.io.MemoryUsageSetting; import org.apache.pdfbox.multipdf.PDFMergerUtility; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDPage; import org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException; import org.apache.pdfbox.pdmodel.interactive.documentnavigation.destination.PDPageDestination; import org.apache.pdfbox.pdmodel.interactive.documentnavigation.destination.PDPageFitWidthDestination; import org.apache.pdfbox.pdmodel.interactive.documentnavigation.outline.PDDocumentOutline; im...
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Notes: Java module to convert PDF document to Image_Files

 import java.awt.image.BufferedImage; import java.io.File; import java.util.Arrays; import javax.imageio.ImageIO; import org.apache.commons.lang3.StringUtils; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.rendering.ImageType; import org.apache.pdfbox.rendering.PDFRenderer; private static void convertPdfToImage(String pdfFilePath, String imageFolderPath) throws Exception {         File file = new File(pdfFilePath);         String fileExtension = ".jpg";         int dpi=300;         try (PDDocument doc = PDDocument.load(file)) {             PDFRenderer pdfRenderer = new PDFRenderer(doc);             for (int i = 0; i < doc.getPages().getCount(); i++) {                 BufferedImage img = pdfRenderer.renderImageWithDPI(i, dpi, ImageType.RGB);           ...
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C++ code to connect Postgres Database

/* At first install libpqxx in linux*/ #include <pqxx/pqxx> using namespace std; using namespace pqxx; class GetDbConn { public:     static connection *getPostgresDbConnection(const std::string& conStr)     {         pqxx::connection *c=new connection(conStr);         return c;     } }; ---------------- /*Code to call this connection is as follows #include <pqxx/pqxx> #include "getDbConn.h" using namespace std; using namespace pqxx; class MyDb { public:     static connection * getTradingNseConnection()     {         char const *conStr="dbname = <database_name> user = <user_name> password = <db_password> hostaddr = 127.0.0.1 port = 5432";         pqxx::connection *con=GetDbConn::getPostgresDbConnection(conStr);         if ((*con).is_open())         {           ...
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