Add some new methods to handle signature's font color. Add a test.

DEVSIX-1850

Author: ars18wrw

sign/src/main/java/com/itextpdf/signatures/PdfSignatureAppearance.java

@@ -46,6 +46,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.forms.PdfAcroForm;
 import com.itextpdf.forms.fields.PdfFormField;
 import com.itextpdf.io.image.ImageData;
+import com.itextpdf.kernel.colors.Color;
 import com.itextpdf.kernel.font.PdfFont;
 import com.itextpdf.kernel.font.PdfFontFactory;
 import com.itextpdf.kernel.geom.Rectangle;
@@ -192,6 +193,11 @@ public class PdfSignatureAppearance {
      */
     private float layer2FontSize = 0;
 
+    /**
+     * Font color for the font of Layer 2.
+     */
+    private Color layer2FontColor;
+
     /**
      * Indicates the field to be signed if it is already presented in the document
      * (signing existing field). Required for {@link #reuseAppearance} option.
@@ -546,6 +552,34 @@ public PdfSignatureAppearance setLayer2FontSize(float fontSize) {
         return this;
     }
 
+    /**
+     * Gets the n2 and n4 layer font size.
+     *
+     * @return the n2 and n4 layer font size
+     */
+    public float getLayer2FontSize() {
+        return layer2FontSize;
+    }
+
+    /**
+     * Sets the n2 and n4 layer font color.
+     *
+     * @param color font color
+     */
+    public PdfSignatureAppearance setLayer2FontColor(Color color) {
+        this.layer2FontColor = color;
+        return this;
+    }
+
+    /**
+     * Gets the n2 and n4 layer font color.
+     *
+     * @return the n2 and n4 layer font color
+     */
+    public Color getLayer2FontColor() {
+        return layer2FontColor;
+    }
+
     /**
      * Gets the visibility status of the signature.
      *
@@ -855,6 +889,7 @@ private void addTextToCanvas(String text, PdfFont font, Rectangle dataRect) {
         canvas = new PdfCanvas(n2, document);
         Paragraph paragraph = new Paragraph(text).setFont(font).setMargin(0).setMultipliedLeading(0.9f);
         Canvas layoutCanvas = new Canvas(canvas, document, dataRect);
+        paragraph.setFontColor(layer2FontColor);
         if (layer2FontSize == 0) {
             applyCopyFittingFontSize(paragraph, dataRect, layoutCanvas.getRenderer());
         } else {

sign/src/test/java/com/itextpdf/signatures/sign/PdfSignatureAppearanceTest.java

@@ -44,11 +44,14 @@ This file is part of the iText (R) project.
 
 import com.itextpdf.forms.PdfAcroForm;
 import com.itextpdf.io.image.ImageDataFactory;
+import com.itextpdf.io.util.MessageFormatUtil;
+import com.itextpdf.kernel.colors.ColorConstants;
 import com.itextpdf.kernel.geom.Rectangle;
 import com.itextpdf.kernel.pdf.PdfDocument;
 import com.itextpdf.kernel.pdf.PdfName;
 import com.itextpdf.kernel.pdf.PdfReader;
 import com.itextpdf.kernel.pdf.PdfStream;
+import com.itextpdf.kernel.utils.CompareTool;
 import com.itextpdf.signatures.BouncyCastleDigest;
 import com.itextpdf.signatures.DigestAlgorithms;
 import com.itextpdf.signatures.IExternalSignature;
@@ -75,7 +78,6 @@ This file is part of the iText (R) project.
 import java.security.UnrecoverableKeyException;
 import java.security.cert.Certificate;
 import java.security.cert.CertificateException;
-import com.itextpdf.io.util.MessageFormatUtil;
 
 @Category(IntegrationTest.class)
 public class PdfSignatureAppearanceTest extends ExtendedITextTest {
@@ -203,5 +205,28 @@ private static void assertAppearanceFontSize(String filename, float expectedFont
         Assert.assertTrue(MessageFormatUtil.format("Font size: exptected {0}, found {1}", expectedFontSize, fontSize), Math.abs(foundFontSize - expectedFontSize) < 0.1 * expectedFontSize);
     }
 
+    @Test
+    public void fontColorTest01() throws GeneralSecurityException, IOException, InterruptedException {
+        String fileName = "fontColorTest01.pdf";
+        String dest = destinationFolder + fileName;
+
+        Rectangle rect = new Rectangle(36, 648, 100, 50);
+        String src = sourceFolder + "simpleDocument.pdf";
+
+        PdfSigner signer = new PdfSigner(new PdfReader(src), new FileOutputStream(dest), false);
+        // Creating the appearance
+        signer.getSignatureAppearance()
+                .setLayer2FontColor(ColorConstants.RED)
+                .setLayer2Text("Verified and signed by me.")
+                .setPageRect(rect);
+
+        signer.setFieldName("Signature1");
+        // Creating the signature
+        IExternalSignature pks = new PrivateKeySignature(pk, DigestAlgorithms.SHA256, BouncyCastleProvider.PROVIDER_NAME);
+        signer.signDetached(new BouncyCastleDigest(), pks, chain, null, null, null, 0, PdfSigner.CryptoStandard.CADES);
+
+        Assert.assertNull(new CompareTool().compareVisually(dest, sourceFolder + "cmp_" + fileName, destinationFolder,
+                "diff_"));
+    }
 
 }