PDF Cert validation (#2394)

* verifyCerts

* cert info

* Hardening suggestions for Stirling-PDF / certValidate (#2395)

* Protect `readLine()` against DoS

* Switch order of literals to prevent NullPointerException

---------

Co-authored-by: pixeebot[bot] <104101892+pixeebot[bot]@users.noreply.github.com>

* some basic html excaping and translation fixing

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Co-authored-by: pixeebot[bot] <104101892+pixeebot[bot]@users.noreply.github.com>
Co-authored-by: a <a>

src/main/java/stirling/software/SPDF/controller/api/misc/StampController.java

@@ -147,7 +147,7 @@ public class StampController {
         return WebResponseUtils.pdfDocToWebResponse(
                 document,
                 Filenames.toSimpleFileName(pdfFile.getOriginalFilename())
-                        .replaceFirst("[.][^.]+$", "")
+                                .replaceFirst("[.][^.]+$", "")
                         + "_stamped.pdf");
     }
 
@@ -191,7 +191,7 @@ public class StampController {
             String fileExtension = resourceDir.substring(resourceDir.lastIndexOf("."));
             File tempFile = Files.createTempFile("NotoSansFont", fileExtension).toFile();
             try (InputStream is = classPathResource.getInputStream();
-                 FileOutputStream os = new FileOutputStream(tempFile)) {
+                    FileOutputStream os = new FileOutputStream(tempFile)) {
                 IOUtils.copy(is, os);
                 font = PDType0Font.load(document, tempFile);
             } finally {
@@ -339,4 +339,4 @@ public class StampController {
     private float calculateTextCapHeight(PDFont font, float fontSize) {
         return font.getFontDescriptor().getCapHeight() / 1000 * fontSize;
     }
-}
+}