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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
package com.itextpdf.signatures;
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;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfStream;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.kernel.pdf.xobject.PdfFormXObject;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.layout.LayoutArea;
import com.itextpdf.layout.layout.LayoutContext;
import com.itextpdf.layout.layout.LayoutResult;
import com.itextpdf.layout.renderer.IRenderer;
import java.io.IOException;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.Calendar;
/**
* Provides convenient methods to make a signature appearance. Use it in conjunction with {@link PdfSigner}.
*/
public class PdfSignatureAppearance {
/**
* Extra space at the top.
*/
private static final float TOP_SECTION = 0.3f;
/**
* Margin for the content inside the signature rectangle.
*/
private static final float MARGIN = 2;
/**
* The document to be signed.
*/
private PdfDocument document;
/**
* The page where the signature will appear.
*/
private int page = 1;
/**
* The coordinates of the rectangle for a visible signature,
* or a zero-width, zero-height rectangle for an invisible signature.
*/
private Rectangle rect;
/**
* Rectangle that represent the position and dimension of the signature in the page.
*/
private Rectangle pageRect;
/**
* Zero level of the signature appearance.
*/
private PdfFormXObject n0;
/**
* Second level of the signature appearance.
*/
private PdfFormXObject n2;
/**
* Form containing all layers drawn on top of each other.
*/
private PdfFormXObject topLayer;
/**
* The rendering mode chosen for visible signatures.
*/
private RenderingMode renderingMode = RenderingMode.DESCRIPTION;
/**
* The reason for signing.
*/
private String reason = "";
/**
* The caption for the reason for signing.
*/
private String reasonCaption = "Reason: ";
/**
* Holds value of property location.
*/
private String location = "";
/**
* The caption for the location of signing.
*/
private String locationCaption = "Location: ";
/**
* Holds value of the application that creates the signature.
*/
private String signatureCreator = "";
/**
* The contact name of the signer.
*/
private String contact = "";
/**
* Holds value of property signDate.
*/
private Calendar signDate;
/**
* The signing certificate.
*/
private Certificate signCertificate;
/**
* The image that needs to be used for a visible signature.
*/
private ImageData signatureGraphic = null;
/**
* A background image for the text in layer 2.
*/
private ImageData image;
/**
* The scaling to be applied to the background image.
*/
private float imageScale;
/**
* The text that goes in Layer 2 of the signature appearance.
*/
private String layer2Text;
/**
* Font for the text in Layer 2.
*/
private PdfFont layer2Font;
/**
* Font size for the font of Layer 2.
*/
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.
*/
private String fieldName;
/**
* Indicates if we need to reuse the existing appearance as layer 0.
*/
private boolean reuseAppearance = false;
/**
* Creates a PdfSignatureAppearance.
*
* @param document PdfDocument
* @param pageRect Rectangle of the appearance
* @param pageNumber Number of the page the appearance should be on
*/
protected PdfSignatureAppearance(PdfDocument document, Rectangle pageRect, int pageNumber) {
this.document = document;
this.pageRect = new Rectangle(pageRect);
this.rect = new Rectangle(pageRect.getWidth(), pageRect.getHeight());
this.page = pageNumber;
}
/**
* Provides the page number of the signature field which this signature
* appearance is associated with.
*
* @return The page number of the signature field which this signature
* appearance is associated with.
*/
public int getPageNumber() {
return page;
}
/**
* Sets the page number of the signature field which this signature
* appearance is associated with. Implicitly calls {@link PdfSignatureAppearance#setPageRect}
* which considers page number to process the rectangle correctly.
*
* @param pageNumber The page number of the signature field which
* this signature appearance is associated with.
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setPageNumber(int pageNumber) {
this.page = pageNumber;
setPageRect(pageRect);
return this;
}
/**
* Provides the rectangle that represent the position and dimension
* of the signature field in the page.
*
* @return the rectangle that represent the position and dimension
* of the signature field in the page
*/
public Rectangle getPageRect() {
return pageRect;
}
/**
* Sets the rectangle that represent the position and dimension of
* the signature field in the page.
*
* @param pageRect The rectangle that represents the position and
* dimension of the signature field in the page.
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setPageRect(Rectangle pageRect) {
this.pageRect = new Rectangle(pageRect);
this.rect = new Rectangle(pageRect.getWidth(), pageRect.getHeight());
return this;
}
/**
* Get Layer 0 of the appearance.
*
* @return layer 0
*/
public PdfFormXObject getLayer0() {
if (n0 == null) {
n0 = new PdfFormXObject(rect);
n0.makeIndirect(document);
}
return n0;
}
/**
* Get Layer 2 of the appearance.
*
* @return layer 2
*/
public PdfFormXObject getLayer2() {
if (n2 == null) {
n2 = new PdfFormXObject(rect);
n2.makeIndirect(document);
}
return n2;
}
/**
* Gets the rendering mode for this signature.
*
* @return the rendering mode for this signature
*/
public RenderingMode getRenderingMode() {
return renderingMode;
}
/**
* Sets the rendering mode for this signature.
*
* @param renderingMode the rendering mode
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setRenderingMode(RenderingMode renderingMode) {
this.renderingMode = renderingMode;
return this;
}
/**
* Returns the signing reason.
*
* @return reason for signing
*/
public String getReason() {
return this.reason;
}
/**
* Sets the signing reason.
*
* @param reason signing reason.
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setReason(String reason) {
this.reason = reason;
return this;
}
/**
* Sets the caption for the signing reason.
*
* @param reasonCaption A new signing reason caption
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setReasonCaption(String reasonCaption) {
this.reasonCaption = reasonCaption;
return this;
}
/**
* Returns the signing location.
*
* @return signing location
*/
public String getLocation() {
return this.location;
}
/**
* Sets the signing location.
*
* @param location A new signing location
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setLocation(String location) {
this.location = location;
return this;
}
/**
* Sets the caption for the signing location.
*
* @param locationCaption A new signing location caption
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setLocationCaption(String locationCaption) {
this.locationCaption = locationCaption;
return this;
}
/**
* Returns the signature creator.
*
* @return The signature creator
*/
public String getSignatureCreator(){
return signatureCreator;
}
/**
* Sets the name of the application used to create the signature.
*
* @param signatureCreator A new name of the application signing a document
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setSignatureCreator(String signatureCreator){
this.signatureCreator = signatureCreator;
return this;
}
/**
* Returns the signing contact.
*
* @return The signing contact
*/
public String getContact() {
return this.contact;
}
/**
* Sets the signing contact.
*
* @param contact A new signing contact
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setContact(String contact) {
this.contact = contact;
return this;
}
/**
* Sets the certificate used to provide the text in the appearance.
* This certificate doesn't take part in the actual signing process.
*
* @param signCertificate the certificate
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setCertificate(Certificate signCertificate) {
this.signCertificate = signCertificate;
return this;
}
/**
* Get the signing certificate.
*
* @return the signing certificate
*/
public Certificate getCertificate() {
return signCertificate;
}
/**
* Gets the Image object to render.
*
* @return the image
*/
public ImageData getSignatureGraphic() {
return signatureGraphic;
}
/**
* Sets the Image object to render when Render is set to RenderingMode.GRAPHIC or RenderingMode.GRAPHIC_AND_DESCRIPTION.
*
* @param signatureGraphic image rendered. If null the mode is defaulted to RenderingMode.DESCRIPTION
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setSignatureGraphic(ImageData signatureGraphic) {
this.signatureGraphic = signatureGraphic;
return this;
}
/**
* Indicates that the existing appearances needs to be reused as layer 0.
*
* @param reuseAppearance is an appearances reusing flag value to set
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setReuseAppearance(boolean reuseAppearance) {
this.reuseAppearance = reuseAppearance;
return this;
}
// layer 2
/**
* Gets the background image for the layer 2.
*
* @return the background image for the layer 2
*/
public ImageData getImage() {
return this.image;
}
/**
* Sets the background image for the layer 2.
*
* @param image the background image for the layer 2
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setImage(ImageData image) {
this.image = image;
return this;
}
/**
* Gets the scaling to be applied to the background image.
*
* @return the scaling to be applied to the background image
*/
public float getImageScale() {
return this.imageScale;
}
/**
* Sets the scaling to be applied to the background image. If it's zero the image
* will fully fill the rectangle. If it's less than zero the image will fill the rectangle but
* will keep the proportions. If it's greater than zero that scaling will be applied.
* In any of the cases the image will always be centered. It's zero by default.
*
* @param imageScale the scaling to be applied to the background image
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setImageScale(float imageScale) {
this.imageScale = imageScale;
return this;
}
/**
* Sets the signature text identifying the signer.
*
* @param text the signature text identifying the signer. If null or not set
* a standard description will be used
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setLayer2Text(String text) {
layer2Text = text;
return this;
}
/**
* Gets the signature text identifying the signer if set by setLayer2Text().
*
* @return the signature text identifying the signer
*/
public String getLayer2Text() {
return layer2Text;
}
/**
* Gets the n2 and n4 layer font.
*
* @return the n2 and n4 layer font
*/
public PdfFont getLayer2Font() {
return this.layer2Font;
}
/**
* Sets the n2 and n4 layer font. If the font size is zero, auto-fit will be used.
*
* @param layer2Font the n2 and n4 font
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setLayer2Font(PdfFont layer2Font) {
this.layer2Font = layer2Font;
return this;
}
/**
* Sets the n2 and n4 layer font size.
*
* @param fontSize font size
*
* @return this instance to support fluent interface
*/
public PdfSignatureAppearance setLayer2FontSize(float fontSize) {
this.layer2FontSize = 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
*
* @return this instance to support fluent interface
*/
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.
*
* @return the visibility status of the signature
*/
public boolean isInvisible() {
return rect == null || rect.getWidth() == 0 || rect.getHeight() == 0;
}
/**
* Constructs appearance (top-level) for a signature.
*
* @return a top-level signature appearance
* @throws IOException if font cannot be created
* @see Adobe Pdf Digital
* Signature Appearances
*/
protected PdfFormXObject getAppearance() throws IOException {
PdfCanvas canvas;
if (isInvisible()) {
PdfFormXObject appearance = new PdfFormXObject(new Rectangle(0, 0));
appearance.makeIndirect(document);
return appearance;
}
if (n0 == null && !reuseAppearance) {
createBlankN0();
}
if (n2 == null) {
n2 = new PdfFormXObject(rect);
n2.makeIndirect(document);
canvas = new PdfCanvas(n2, document);
int rotation = document.getPage(page).getRotation();
if (rotation == 90) {
canvas.concatMatrix(0, 1, -1, 0, rect.getWidth(), 0);
} else if (rotation == 180) {
canvas.concatMatrix(-1, 0, 0, -1, rect.getWidth(), rect.getHeight());
} else if (rotation == 270) {
canvas.concatMatrix(0, -1, 1, 0, 0, rect.getHeight());
}
Rectangle rotatedRect = rotateRectangle(this.rect, document.getPage(page).getRotation());
String text;
if (layer2Text == null) {
StringBuilder buf = new StringBuilder();
buf.append("Digitally signed by ");
String name = null;
CertificateInfo.X500Name x500name = CertificateInfo.getSubjectFields((X509Certificate)signCertificate);
if (x500name != null) {
name = x500name.getField("CN");
if (name == null)
name = x500name.getField("E");
}
if (name == null)
name = "";
buf.append(name).append('\n');
buf.append("Date: ").append(SignUtils.dateToString(signDate));
if (reason != null)
buf.append('\n').append(reasonCaption).append(reason);
if (location != null)
buf.append('\n').append(locationCaption).append(location);
text = buf.toString();
} else {
text = layer2Text;
}
if (image != null) {
if (imageScale == 0) {
canvas = new PdfCanvas(n2, document);
canvas.addImage(image, rotatedRect.getWidth(), 0, 0, rotatedRect.getHeight(), 0, 0);
} else {
float usableScale = imageScale;
if (imageScale < 0) {
usableScale = Math.min(rotatedRect.getWidth() / image.getWidth(), rotatedRect.getHeight() / image.getHeight());
}
float w = image.getWidth() * usableScale;
float h = image.getHeight() * usableScale;
float x = (rotatedRect.getWidth() - w) / 2;
float y = (rotatedRect.getHeight() - h) / 2;
canvas = new PdfCanvas(n2, document);
canvas.addImage(image, w, 0, 0, h, x, y);
}
}
PdfFont font;
if (layer2Font == null) {
font = PdfFontFactory.createFont();
} else {
font = layer2Font;
}
Rectangle dataRect = null;
Rectangle signatureRect = null;
if (renderingMode == RenderingMode.NAME_AND_DESCRIPTION ||
renderingMode == RenderingMode.GRAPHIC_AND_DESCRIPTION && this.signatureGraphic != null) {
if (rotatedRect.getHeight() > rotatedRect.getWidth()) {
signatureRect = new Rectangle(
MARGIN,
rotatedRect.getHeight() / 2,
rotatedRect.getWidth() - 2 * MARGIN,
rotatedRect.getHeight() / 2);
dataRect = new Rectangle(
MARGIN,
MARGIN,
rotatedRect.getWidth() - 2 * MARGIN,
rotatedRect.getHeight() / 2 - 2 * MARGIN);
} else {
// origin is the bottom-left
signatureRect = new Rectangle(
MARGIN,
MARGIN,
rotatedRect.getWidth() / 2 - 2 * MARGIN,
rotatedRect.getHeight() - 2 * MARGIN);
dataRect = new Rectangle(
rotatedRect.getWidth() / 2 + MARGIN / 2,
MARGIN,
rotatedRect.getWidth() / 2 - MARGIN,
rotatedRect.getHeight() - 2 * MARGIN);
}
} else if (renderingMode == RenderingMode.GRAPHIC) {
if (signatureGraphic == null) {
throw new IllegalStateException("A signature image must be present when rendering mode is graphic. Use setSignatureGraphic()");
}
signatureRect = new Rectangle(
MARGIN,
MARGIN,
rotatedRect.getWidth() - 2 * MARGIN, // take all space available
rotatedRect.getHeight() - 2 * MARGIN);
} else {
dataRect = new Rectangle(
MARGIN,
MARGIN,
rotatedRect.getWidth() - 2 * MARGIN,
rotatedRect.getHeight() * (1 - TOP_SECTION) - 2 * MARGIN);
}
switch (renderingMode) {
case NAME_AND_DESCRIPTION:
String signedBy = CertificateInfo.getSubjectFields((X509Certificate) signCertificate).getField("CN");
if (signedBy == null) {
signedBy = CertificateInfo.getSubjectFields((X509Certificate) signCertificate).getField("E");
}
if (signedBy == null) {
signedBy = "";
}
addTextToCanvas(signedBy, font, signatureRect);
break;
case GRAPHIC_AND_DESCRIPTION: {
if (signatureGraphic == null) {
throw new IllegalStateException("A signature image must be present when rendering mode is graphic and description. Use setSignatureGraphic()");
}
float imgWidth = signatureGraphic.getWidth();
if (imgWidth == 0) {
imgWidth = signatureRect.getWidth();
}
float imgHeight = signatureGraphic.getHeight();
if (imgHeight == 0) {
imgHeight = signatureRect.getHeight();
}
float multiplierH = signatureRect.getWidth() / signatureGraphic.getWidth();
float multiplierW = signatureRect.getHeight() / signatureGraphic.getHeight();
float multiplier = Math.min(multiplierH, multiplierW);
imgWidth *= multiplier;
imgHeight *= multiplier;
float x = signatureRect.getRight() - imgWidth;
float y = signatureRect.getBottom() + (signatureRect.getHeight() - imgHeight) / 2;
canvas = new PdfCanvas(n2, document);
canvas.addImage(signatureGraphic, imgWidth, 0, 0, imgHeight, x, y);
break;
}
case GRAPHIC:
float imgWidth = signatureGraphic.getWidth();
if (imgWidth == 0) {
imgWidth = signatureRect.getWidth();
}
float imgHeight = signatureGraphic.getHeight();
if (imgHeight == 0) {
imgHeight = signatureRect.getHeight();
}
float multiplierH = signatureRect.getWidth() / signatureGraphic.getWidth();
float multiplierW = signatureRect.getHeight() / signatureGraphic.getHeight();
float multiplier = Math.min(multiplierH, multiplierW);
imgWidth *= multiplier;
imgHeight *= multiplier;
float x = signatureRect.getLeft() + (signatureRect.getWidth() - imgWidth) / 2;
float y = signatureRect.getBottom() + (signatureRect.getHeight() - imgHeight) / 2;
canvas = new PdfCanvas(n2, document);
canvas.addImage(signatureGraphic, imgWidth, 0, 0, imgHeight, x, y);
break;
}
if (renderingMode != RenderingMode.GRAPHIC) {
addTextToCanvas(text, font, dataRect);
}
}
Rectangle rotated = new Rectangle(rect);
if (topLayer == null) {
topLayer = new PdfFormXObject(rotated);
topLayer.makeIndirect(document);
if (reuseAppearance) {
PdfAcroForm acroForm = PdfAcroForm.getAcroForm(document, true);
PdfFormField field = acroForm.getField(fieldName);
PdfStream stream = field.getWidgets().get(0).getAppearanceDictionary().getAsStream(PdfName.N);
PdfFormXObject xobj = new PdfFormXObject(stream);
if (stream != null) {
topLayer.getResources().addForm(xobj, new PdfName("n0"));
PdfCanvas canvas1 = new PdfCanvas(topLayer, document);
canvas1.addXObject(xobj, 1, 0, 0, 1, 0, 0);
} else {
reuseAppearance = false;
if (n0 == null) {
createBlankN0();
}
}
}
if (!reuseAppearance) {
topLayer.getResources().addForm(n0, new PdfName("n0"));
PdfCanvas canvas1 = new PdfCanvas(topLayer, document);
canvas1.addXObject(n0, 1, 0, 0, 1, 0, 0);
}
topLayer.getResources().addForm(n2, new PdfName("n2"));
PdfCanvas canvas1 = new PdfCanvas(topLayer, document);
canvas1.addXObject(n2, 1, 0, 0, 1, 0, 0);
}
PdfFormXObject napp = new PdfFormXObject(rotated);
napp.makeIndirect(document);
napp.getResources().addForm(topLayer, new PdfName("FRM"));
canvas = new PdfCanvas(napp, document);
canvas.addXObject(topLayer, 0, 0);
return napp;
}
/**
* Returns the signature date.
*
* @return the signature date
*/
protected java.util.Calendar getSignDate() {
return signDate;
}
/**
* Sets the signature date.
*
* @param signDate A new signature date
*
* @return this instance to support fluent interface
*/
protected PdfSignatureAppearance setSignDate(java.util.Calendar signDate) {
this.signDate = signDate;
return this;
}
/**
* Set the field name of the appearance.
*
* @param fieldName name of the field
*
* @return this instance to support fluent interface
*/
protected PdfSignatureAppearance setFieldName(String fieldName) {
this.fieldName = fieldName;
return this;
}
private static Rectangle rotateRectangle(Rectangle rect, int angle) {
if (0 == (angle / 90) % 2) {
return new Rectangle(rect.getWidth(), rect.getHeight());
} else {
return new Rectangle(rect.getHeight(), rect.getWidth());
}
}
private void createBlankN0() {
n0 = new PdfFormXObject(new Rectangle(100, 100));
n0.makeIndirect(document);
PdfCanvas canvas = new PdfCanvas(n0, document);
canvas.writeLiteral("% DSBlank\n");
}
private void addTextToCanvas(String text, PdfFont font, Rectangle dataRect) {
PdfCanvas canvas;
canvas = new PdfCanvas(n2, document);
Paragraph paragraph = new Paragraph(text).setFont(font).setMargin(0).setMultipliedLeading(0.9f);
Canvas layoutCanvas = new Canvas(canvas, dataRect);
paragraph.setFontColor(layer2FontColor);
if (layer2FontSize == 0) {
applyCopyFittingFontSize(paragraph, dataRect, layoutCanvas.getRenderer());
} else {
paragraph.setFontSize(layer2FontSize);
}
layoutCanvas.add(paragraph);
}
private void applyCopyFittingFontSize(Paragraph paragraph, Rectangle rect, IRenderer parentRenderer) {
IRenderer renderer = paragraph.createRendererSubTree().setParent(parentRenderer);
LayoutContext layoutContext = new LayoutContext(new LayoutArea(1, rect));
float lFontSize = 0.1f, rFontSize = 100;
int numberOfIterations = 15; // 15 iterations with lFontSize = 0.1 and rFontSize = 100 should result in ~0.003 precision
for (int i = 0; i < numberOfIterations; i++) {
float mFontSize = (lFontSize + rFontSize) / 2;
paragraph.setFontSize(mFontSize);
LayoutResult result = renderer.layout(layoutContext);
if (result.getStatus() == LayoutResult.FULL) {
lFontSize = mFontSize;
} else {
rFontSize = mFontSize;
}
}
paragraph.setFontSize(lFontSize);
}
/**
* Signature rendering modes.
*/
public enum RenderingMode {
/**
* The rendering mode is just the description.
*/
DESCRIPTION,
/**
* The rendering mode is the name of the signer and the description.
*/
NAME_AND_DESCRIPTION,
/**
* The rendering mode is an image and the description.
*/
GRAPHIC_AND_DESCRIPTION,
/**
* The rendering mode is just an image.
*/
GRAPHIC
}
}
