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/*
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2016 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * 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 http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: [email protected]
 */
package com.itextpdf.text.pdf;

import com.itextpdf.text.Chunk;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Image;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.Version;
import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.io.RASInputStream;
import com.itextpdf.text.io.RandomAccessSource;
import com.itextpdf.text.io.RandomAccessSourceFactory;
import com.itextpdf.text.pdf.AcroFields.Item;
import com.itextpdf.text.pdf.interfaces.PdfVersion;
import com.itextpdf.text.pdf.security.CertificateInfo;
import com.itextpdf.text.pdf.security.CertificateInfo.X500Name;

import java.io.EOFException;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Map;

/**
 * Class that takes care of the cryptographic options
 * and appearances that form a signature.
 */
public class PdfSignatureAppearance {

	/**
	 * Constructs a PdfSignatureAppearance object.
     * @param writer	the writer to which the signature will be written.
     */
    PdfSignatureAppearance(PdfStamperImp writer) {
        this.writer = writer;
        signDate = new GregorianCalendar();
        fieldName = getNewSigName();
        signatureCreator = Version.getInstance().getVersion();
    }

	/*
	 * SIGNATURE
	 */

    // signature types

    /** Approval signature */
    public static final int NOT_CERTIFIED = 0;

    /** Author signature, no changes allowed */
    public static final int CERTIFIED_NO_CHANGES_ALLOWED = 1;

    /** Author signature, form filling allowed */
    public static final int CERTIFIED_FORM_FILLING = 2;

    /** Author signature, form filling and annotations allowed */
    public static final int CERTIFIED_FORM_FILLING_AND_ANNOTATIONS = 3;

    /** The certification level */
    private int certificationLevel = NOT_CERTIFIED;

    /**
     * Sets the document type to certified instead of simply signed.
     * @param certificationLevel the values can be: NOT_CERTIFIED, CERTIFIED_NO_CHANGES_ALLOWED,
     * CERTIFIED_FORM_FILLING and CERTIFIED_FORM_FILLING_AND_ANNOTATIONS
     */
    public void setCertificationLevel(int certificationLevel) {
        this.certificationLevel = certificationLevel;
    }

    /**
     * Gets the certified status of this document.
     * @return the certified status
     */
    public int getCertificationLevel() {
        return this.certificationLevel;
    }

    // signature info

    /** The caption for the reason for signing. */
    private String reasonCaption = "Reason: ";

    /** The caption for the location of signing. */
    private String locationCaption = "Location: ";

    /** The reason for signing. */
    private String reason;

    /** Holds value of property location. */
    private String location;

    /** Holds value of property signDate. */
    private Calendar signDate;

    /**
     * Gets the signing reason.
     * @return the signing reason
     */
    public String getReason() {
        return this.reason;
    }

    /**
     * Sets the signing reason.
     * @param reason the signing reason
     */
    public void setReason(String reason) {
        this.reason = reason;
    }

    /**
     * Sets the caption for signing reason.
     * @param reasonCaption the signing reason caption
     */
    public void setReasonCaption(String reasonCaption) {
        this.reasonCaption = reasonCaption;
    }

    /**
     * Gets the signing location.
     * @return the signing location
     */
    public String getLocation() {
        return this.location;
    }

    /**
     * Sets the signing location.
     * @param location the signing location
     */
    public void setLocation(String location) {
        this.location = location;
    }

    /**
     * Sets the caption for the signing location.
     * @param locationCaption the signing location caption
     */
    public void setLocationCaption(String locationCaption) {
        this.locationCaption = locationCaption;
    }

    /** Holds value of the application that creates the signature */
    private String signatureCreator;

    /**
     * Gets 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 the name of the signature creating application
     */
    public void setSignatureCreator(String signatureCreator){
    	this.signatureCreator = signatureCreator;
    }

    /** The contact name of the signer. */
    private String contact;

    /**
     * Gets the signing contact.
     * @return the signing contact
     */
    public String getContact() {
        return this.contact;
    }

    /**
     * Sets the signing contact.
     * @param contact the signing contact
     */
    public void setContact(String contact) {
        this.contact = contact;
    }

    /**
     * Gets the signature date.
     * @return the signature date
     */
    public java.util.Calendar getSignDate() {
        return signDate;
    }

    /**
     * Sets the signature date.
     * @param signDate the signature date
     */
    public void setSignDate(java.util.Calendar signDate) {
        this.signDate = signDate;
    }

    // the PDF file

    /** The file right before the signature is added (can be null). */
    private RandomAccessFile raf;
    /** The bytes of the file right before the signature is added (if raf is null) */
    private byte[] bout;
    /** Array containing the byte positions of the bytes that need to be hashed. */
    private long[] range;

    /**
     * Gets the document bytes that are hashable when using external signatures. The general sequence is:
     * preClose(), getRangeStream() and close().
     * 

* @return the document bytes that are hashable */ public InputStream getRangeStream() throws IOException { RandomAccessSourceFactory fac = new RandomAccessSourceFactory(); return new RASInputStream(fac.createRanged(getUnderlyingSource(), range)); } /** * @return the underlying source * @throws IOException */ private RandomAccessSource getUnderlyingSource() throws IOException { //TODO: get rid of separate byte[] and RandomAccessFile objects and just store a RandomAccessSource RandomAccessSourceFactory fac = new RandomAccessSourceFactory(); return raf == null ? fac.createSource(bout) : fac.createSource(raf); } /** The signing certificate */ private Certificate signCertificate; // Developer extenstion /** * Adds the appropriate developer extension. */ public void addDeveloperExtension(final PdfDeveloperExtension de) { writer.addDeveloperExtension(de); } // Crypto dictionary /** The crypto dictionary */ private PdfDictionary cryptoDictionary; /** * Gets the user made signature dictionary. This is the dictionary at the /V key. * @return the user made signature dictionary */ public com.itextpdf.text.pdf.PdfDictionary getCryptoDictionary() { return cryptoDictionary; } /** * Sets a user made signature dictionary. This is the dictionary at the /V key. * @param cryptoDictionary a user made signature dictionary */ public void setCryptoDictionary(com.itextpdf.text.pdf.PdfDictionary cryptoDictionary) { this.cryptoDictionary = cryptoDictionary; } /** * 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 */ public void setCertificate(Certificate signCertificate) { this.signCertificate = signCertificate; } public Certificate getCertificate() { return signCertificate; } // Signature event /** * An interface to retrieve the signature dictionary for modification. */ public interface SignatureEvent { /** * Allows modification of the signature dictionary. * @param sig the signature dictionary */ public void getSignatureDictionary(PdfDictionary sig); } /** * Holds value of property signatureEvent. */ private SignatureEvent signatureEvent; /** * Getter for property signatureEvent. * @return Value of property signatureEvent. */ public SignatureEvent getSignatureEvent() { return this.signatureEvent; } /** * Sets the signature event to allow modification of the signature dictionary. * @param signatureEvent the signature event */ public void setSignatureEvent(SignatureEvent signatureEvent) { this.signatureEvent = signatureEvent; } /* * SIGNATURE FIELD */ /** The name of the field */ private String fieldName; /** * Gets the field name. * @return the field name */ public java.lang.String getFieldName() { return fieldName; } /** * Gets a new signature field name that * doesn't clash with any existing name. * @return a new signature field name */ public String getNewSigName() { AcroFields af = writer.getAcroFields(); String name = "Signature"; int step = 0; boolean found = false; while (!found) { ++step; String n1 = name + step; if (af.getFieldItem(n1) != null) continue; n1 += "."; found = true; for (Object element : af.getFields().keySet()) { String fn = (String)element; if (fn.startsWith(n1)) { found = false; break; } } } name += step; return name; } /** * The page where the signature will appear. */ private int page = 1; /** * Gets the page number of the field. * @return the page number of the field */ public int getPage() { return page; } /** * The coordinates of the rectangle for a visible signature, * or a zero-width, zero-height rectangle for an invisible signature. */ private Rectangle rect; /** * Gets the rectangle representing the signature dimensions. * @return the rectangle representing the signature dimensions. It may be null * or have zero width or height for invisible signatures */ public Rectangle getRect() { return rect; } /** rectangle that represent the position and dimension of the signature in the page. */ private Rectangle pageRect; /** * Gets the rectangle that represent the position and dimension of the signature in the page. * @return the rectangle that represent the position and dimension of the signature in the page */ public Rectangle getPageRect() { return pageRect; } /** * 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; } /** * Sets the signature to be visible. It creates a new visible signature field. * @param pageRect the position and dimension of the field in the page * @param page the page to place the field. The fist page is 1 * @param fieldName the field name or null to generate automatically a new field name */ public void setVisibleSignature(Rectangle pageRect, int page, String fieldName) { if (fieldName != null) { if (fieldName.indexOf('.') >= 0) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("field.names.cannot.contain.a.dot")); AcroFields af = writer.getAcroFields(); AcroFields.Item item = af.getFieldItem(fieldName); if (item != null) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.field.1.already.exists", fieldName)); this.fieldName = fieldName; } if (page < 1 || page > writer.reader.getNumberOfPages()) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("invalid.page.number.1", page)); this.pageRect = new Rectangle(pageRect); this.pageRect.normalize(); rect = new Rectangle(this.pageRect.getWidth(), this.pageRect.getHeight()); this.page = page; } /** * Sets the signature to be visible. An empty signature field with the same name must already exist. * @param fieldName the existing empty signature field name */ public void setVisibleSignature(String fieldName) { AcroFields af = writer.getAcroFields(); AcroFields.Item item = af.getFieldItem(fieldName); if (item == null) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.field.1.does.not.exist", fieldName)); PdfDictionary merged = item.getMerged(0); if (!PdfName.SIG.equals(PdfReader.getPdfObject(merged.get(PdfName.FT)))) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.field.1.is.not.a.signature.field", fieldName)); this.fieldName = fieldName; PdfArray r = merged.getAsArray(PdfName.RECT); float llx = r.getAsNumber(0).floatValue(); float lly = r.getAsNumber(1).floatValue(); float urx = r.getAsNumber(2).floatValue(); float ury = r.getAsNumber(3).floatValue(); pageRect = new Rectangle(llx, lly, urx, ury); pageRect.normalize(); page = item.getPage(0).intValue(); int rotation = writer.reader.getPageRotation(page); Rectangle pageSize = writer.reader.getPageSizeWithRotation(page); switch (rotation) { case 90: pageRect = new Rectangle( pageRect.getBottom(), pageSize.getTop() - pageRect.getLeft(), pageRect.getTop(), pageSize.getTop() - pageRect.getRight()); break; case 180: pageRect = new Rectangle( pageSize.getRight() - pageRect.getLeft(), pageSize.getTop() - pageRect.getBottom(), pageSize.getRight() - pageRect.getRight(), pageSize.getTop() - pageRect.getTop()); break; case 270: pageRect = new Rectangle( pageSize.getRight() - pageRect.getBottom(), pageRect.getLeft(), pageSize.getRight() - pageRect.getTop(), pageRect.getRight()); break; } if (rotation != 0) pageRect.normalize(); rect = new Rectangle(this.pageRect.getWidth(), this.pageRect.getHeight()); } /* * SIGNATURE APPEARANCE */ /** * Signature rendering modes * @since 5.0.1 */ 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 } /** The rendering mode chosen for visible signatures */ private RenderingMode renderingMode = RenderingMode.DESCRIPTION; /** * Gets the rendering mode for this signature. * @return the rendering mode for this signature * @since 5.0.1 */ public RenderingMode getRenderingMode() { return renderingMode; } /** * Sets the rendering mode for this signature. * @param renderingMode the rendering mode * @since 5.0.1 */ public void setRenderingMode(RenderingMode renderingMode) { this.renderingMode = renderingMode; } /** The image that needs to be used for a visible signature */ private Image signatureGraphic = null; /** * Gets the Image object to render. * @return the image */ public Image 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 */ public void setSignatureGraphic(Image signatureGraphic) { this.signatureGraphic = signatureGraphic; } /** Appearance compliant with the recommendations introduced in Acrobat 6? */ private boolean acro6Layers = true; /** * Gets the Acrobat 6.0 layer mode. * @return the Acrobat 6.0 layer mode */ public boolean isAcro6Layers() { return this.acro6Layers; } /** * Acrobat 6.0 and higher recommends that only layer n0 and n2 be present. * Use this method with value false if you want to ignore this recommendation. * @param acro6Layers if true only the layers n0 and n2 will be present * @deprecated Adobe no longer supports Adobe Acrobat / Reader versions older than 9 */ public void setAcro6Layers(boolean acro6Layers) { this.acro6Layers = acro6Layers; } /** Layers for a visible signature. */ private PdfTemplate app[] = new PdfTemplate[5]; /** * Gets a template layer to create a signature appearance. The layers can go from 0 to 4, * but only layer 0 and 2 will be used if acro6Layers is true. *

* Consult PPKAppearances.pdf * for further details. * @param layer the layer * @return a template */ public PdfTemplate getLayer(int layer) { if (layer < 0 || layer >= app.length) return null; PdfTemplate t = app[layer]; if (t == null) { t = app[layer] = new PdfTemplate(writer); t.setBoundingBox(rect); writer.addDirectTemplateSimple(t, new PdfName("n" + layer)); } return t; } /** Indicates if we need to reuse the existing appearance as layer 0. */ private boolean reuseAppearance = false; /** * Indicates that the existing appearances needs to be reused as layer 0. */ public void setReuseAppearance(boolean reuseAppearance) { this.reuseAppearance = reuseAppearance; } // layer 1 /** An appearance that can be used for layer 1 (if acro6Layers is false). */ public static final String questionMark = "% DSUnknown\n" + "q\n" + "1 G\n" + "1 g\n" + "0.1 0 0 0.1 9 0 cm\n" + "0 J 0 j 4 M []0 d\n" + "1 i \n" + "0 g\n" + "313 292 m\n" + "313 404 325 453 432 529 c\n" + "478 561 504 597 504 645 c\n" + "504 736 440 760 391 760 c\n" + "286 760 271 681 265 626 c\n" + "265 625 l\n" + "100 625 l\n" + "100 828 253 898 381 898 c\n" + "451 898 679 878 679 650 c\n" + "679 555 628 499 538 435 c\n" + "488 399 467 376 467 292 c\n" + "313 292 l\n" + "h\n" + "308 214 170 -164 re\n" + "f\n" + "0.44 G\n" + "1.2 w\n" + "1 1 0.4 rg\n" + "287 318 m\n" + "287 430 299 479 406 555 c\n" + "451 587 478 623 478 671 c\n" + "478 762 414 786 365 786 c\n" + "260 786 245 707 239 652 c\n" + "239 651 l\n" + "74 651 l\n" + "74 854 227 924 355 924 c\n" + "425 924 653 904 653 676 c\n" + "653 581 602 525 512 461 c\n" + "462 425 441 402 441 318 c\n" + "287 318 l\n" + "h\n" + "282 240 170 -164 re\n" + "B\n" + "Q\n"; // layer 2 /** A background image for the text in layer 2. */ private Image image; /** * Gets the background image for the layer 2. * @return the background image for the layer 2 */ public Image getImage() { return this.image; } /** * Sets the background image for the layer 2. * @param image the background image for the layer 2 */ public void setImage(Image image) { this.image = image; } /** the scaling to be applied to the background image.t */ private float imageScale; /** * 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 */ public void setImageScale(float imageScale) { this.imageScale = imageScale; } /** The text that goes in Layer 2 of the signature appearance. */ private String layer2Text; /** * 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 */ public void setLayer2Text(String text) { layer2Text = text; } /** * Gets the signature text identifying the signer if set by setLayer2Text(). * @return the signature text identifying the signer */ public String getLayer2Text() { return layer2Text; } /** Font for the text in Layer 2. */ private Font layer2Font; /** * Gets the n2 and n4 layer font. * @return the n2 and n4 layer font */ public Font 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 */ public void setLayer2Font(Font layer2Font) { this.layer2Font = layer2Font; } /** Run direction for the text in layers 2 and 4. */ private int runDirection = PdfWriter.RUN_DIRECTION_NO_BIDI; /** Sets the run direction in the n2 and n4 layer. * @param runDirection the run direction */ public void setRunDirection(int runDirection) { if (runDirection < PdfWriter.RUN_DIRECTION_DEFAULT || runDirection > PdfWriter.RUN_DIRECTION_RTL) throw new RuntimeException(MessageLocalization.getComposedMessage("invalid.run.direction.1", runDirection)); this.runDirection = runDirection; } /** Gets the run direction. * @return the run direction */ public int getRunDirection() { return runDirection; } // layer 4 /** The text that goes in Layer 4 of the appearance. */ private String layer4Text; /** * Sets the text identifying the signature status. Will be ignored if acro6Layers is true. * @param text the text identifying the signature status. If null or not set * the description "Signature Not Verified" will be used */ public void setLayer4Text(String text) { layer4Text = text; } /** * Gets the text identifying the signature status if set by setLayer4Text(). * @return the text identifying the signature status */ public String getLayer4Text() { return layer4Text; } // all layers /** Template containing all layers drawn on top of each other. */ private PdfTemplate frm; /** * Gets the template that aggregates all appearance layers. This corresponds to the /FRM resource. *

* Consult PPKAppearances.pdf * for further details. * @return the template that aggregates all appearance layers */ public PdfTemplate getTopLayer() { if (frm == null) { frm = new PdfTemplate(writer); frm.setBoundingBox(rect); writer.addDirectTemplateSimple(frm, new PdfName("FRM")); } return frm; } // creating the appearance /** 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; /** * Gets the main appearance layer. *

* Consult PPKAppearances.pdf * for further details. * @return the main appearance layer * @throws DocumentException on error */ public PdfTemplate getAppearance() throws DocumentException { if (isInvisible()) { PdfTemplate t = new PdfTemplate(writer); t.setBoundingBox(new Rectangle(0, 0)); writer.addDirectTemplateSimple(t, null); return t; } if (app[0] == null && !reuseAppearance) { createBlankN0(); } if (app[1] == null && !acro6Layers) { PdfTemplate t = app[1] = new PdfTemplate(writer); t.setBoundingBox(new Rectangle(100, 100)); writer.addDirectTemplateSimple(t, new PdfName("n1")); t.setLiteral(questionMark); } if (app[2] == null) { String text; if (layer2Text == null) { StringBuilder buf = new StringBuilder(); buf.append("Digitally signed by "); String name = null; 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'); SimpleDateFormat sd = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss z"); buf.append("Date: ").append(sd.format(signDate.getTime())); 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; PdfTemplate t = app[2] = new PdfTemplate(writer); t.setBoundingBox(rect); writer.addDirectTemplateSimple(t, new PdfName("n2")); if (image != null) { if (imageScale == 0) { t.addImage(image, rect.getWidth(), 0, 0, rect.getHeight(), 0, 0); } else { float usableScale = imageScale; if (imageScale < 0) usableScale = Math.min(rect.getWidth() / image.getWidth(), rect.getHeight() / image.getHeight()); float w = image.getWidth() * usableScale; float h = image.getHeight() * usableScale; float x = (rect.getWidth() - w) / 2; float y = (rect.getHeight() - h) / 2; t.addImage(image, w, 0, 0, h, x, y); } } Font font; if (layer2Font == null) font = new Font(); else font = new Font(layer2Font); float size = font.getSize(); Rectangle dataRect = null; Rectangle signatureRect = null; if (renderingMode == RenderingMode.NAME_AND_DESCRIPTION || renderingMode == RenderingMode.GRAPHIC_AND_DESCRIPTION && this.signatureGraphic != null) { // origin is the bottom-left signatureRect = new Rectangle( MARGIN, MARGIN, rect.getWidth() / 2 - MARGIN, rect.getHeight() - MARGIN); dataRect = new Rectangle( rect.getWidth() / 2 + MARGIN / 2, MARGIN, rect.getWidth() - MARGIN / 2, rect.getHeight() - MARGIN); if (rect.getHeight() > rect.getWidth()) { signatureRect = new Rectangle( MARGIN, rect.getHeight() / 2, rect.getWidth() - MARGIN, rect.getHeight()); dataRect = new Rectangle( MARGIN, MARGIN, rect.getWidth() - MARGIN, rect.getHeight() / 2 - MARGIN); } } else if (renderingMode == RenderingMode.GRAPHIC) { if (signatureGraphic == null) { throw new IllegalStateException(MessageLocalization.getComposedMessage("a.signature.image.should.be.present.when.rendering.mode.is.graphic.only")); } signatureRect = new Rectangle( MARGIN, MARGIN, rect.getWidth() - MARGIN, // take all space available rect.getHeight() - MARGIN); } else { dataRect = new Rectangle( MARGIN, MARGIN, rect.getWidth() - MARGIN, rect.getHeight() * (1 - TOP_SECTION) - 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 = ""; Rectangle sr2 = new Rectangle(signatureRect.getWidth() - MARGIN, signatureRect.getHeight() - MARGIN ); float signedSize = ColumnText.fitText(font, signedBy, sr2, -1, runDirection); ColumnText ct2 = new ColumnText(t); ct2.setRunDirection(runDirection); ct2.setSimpleColumn(new Phrase(signedBy, font), signatureRect.getLeft(), signatureRect.getBottom(), signatureRect.getRight(), signatureRect.getTop(), signedSize, Element.ALIGN_LEFT); ct2.go(); break; case GRAPHIC_AND_DESCRIPTION: if (signatureGraphic == null) { throw new IllegalStateException(MessageLocalization.getComposedMessage("a.signature.image.should.be.present.when.rendering.mode.is.graphic.and.description")); } ct2 = new ColumnText(t); ct2.setRunDirection(runDirection); ct2.setSimpleColumn(signatureRect.getLeft(), signatureRect.getBottom(), signatureRect.getRight(), signatureRect.getTop(), 0, Element.ALIGN_RIGHT); Image im = Image.getInstance(signatureGraphic); im.scaleToFit(signatureRect.getWidth(), signatureRect.getHeight()); Paragraph p = new Paragraph(); // must calculate the point to draw from to make image appear in middle of column float x = 0; // experimentation found this magic number to counteract Adobe's signature graphic, which // offsets the y co-ordinate by 15 units float y = -im.getScaledHeight() + 15; x = x + (signatureRect.getWidth() - im.getScaledWidth()) / 2; y = y - (signatureRect.getHeight() - im.getScaledHeight()) / 2; p.add(new Chunk(im, x + (signatureRect.getWidth() - im.getScaledWidth()) / 2, y, false)); ct2.addElement(p); ct2.go(); break; case GRAPHIC: ct2 = new ColumnText(t); ct2.setRunDirection(runDirection); ct2.setSimpleColumn(signatureRect.getLeft(), signatureRect.getBottom(), signatureRect.getRight(), signatureRect.getTop(), 0, Element.ALIGN_RIGHT); im = Image.getInstance(signatureGraphic); im.scaleToFit(signatureRect.getWidth(), signatureRect.getHeight()); p = new Paragraph(signatureRect.getHeight()); // must calculate the point to draw from to make image appear in middle of column x = (signatureRect.getWidth() - im.getScaledWidth()) / 2; y = (signatureRect.getHeight() - im.getScaledHeight()) / 2; p.add(new Chunk(im, x, y, false)); ct2.addElement(p); ct2.go(); break; default: } if(renderingMode != RenderingMode.GRAPHIC) { if (size <= 0) { Rectangle sr = new Rectangle(dataRect.getWidth(), dataRect.getHeight()); size = ColumnText.fitText(font, text, sr, 12, runDirection); } ColumnText ct = new ColumnText(t); ct.setRunDirection(runDirection); ct.setSimpleColumn(new Phrase(text, font), dataRect.getLeft(), dataRect.getBottom(), dataRect.getRight(), dataRect.getTop(), size, Element.ALIGN_LEFT); ct.go(); } } if (app[3] == null && !acro6Layers) { PdfTemplate t = app[3] = new PdfTemplate(writer); t.setBoundingBox(new Rectangle(100, 100)); writer.addDirectTemplateSimple(t, new PdfName("n3")); t.setLiteral("% DSBlank\n"); } if (app[4] == null && !acro6Layers) { PdfTemplate t = app[4] = new PdfTemplate(writer); t.setBoundingBox(new Rectangle(0, rect.getHeight() * (1 - TOP_SECTION), rect.getRight(), rect.getTop())); writer.addDirectTemplateSimple(t, new PdfName("n4")); Font font; if (layer2Font == null) font = new Font(); else font = new Font(layer2Font); //float size = font.getSize(); String text = "Signature Not Verified"; if (layer4Text != null) text = layer4Text; Rectangle sr = new Rectangle(rect.getWidth() - 2 * MARGIN, rect.getHeight() * TOP_SECTION - 2 * MARGIN); float size = ColumnText.fitText(font, text, sr, 15, runDirection); ColumnText ct = new ColumnText(t); ct.setRunDirection(runDirection); ct.setSimpleColumn(new Phrase(text, font), MARGIN, 0, rect.getWidth() - MARGIN, rect.getHeight() - MARGIN, size, Element.ALIGN_LEFT); ct.go(); } int rotation = writer.reader.getPageRotation(page); Rectangle rotated = new Rectangle(rect); int n = rotation; while (n > 0) { rotated = rotated.rotate(); n -= 90; } if (frm == null) { frm = new PdfTemplate(writer); frm.setBoundingBox(rotated); writer.addDirectTemplateSimple(frm, new PdfName("FRM")); float scale = Math.min(rect.getWidth(), rect.getHeight()) * 0.9f; float x = (rect.getWidth() - scale) / 2; float y = (rect.getHeight() - scale) / 2; scale /= 100; if (rotation == 90) frm.concatCTM(0, 1, -1, 0, rect.getHeight(), 0); else if (rotation == 180) frm.concatCTM(-1, 0, 0, -1, rect.getWidth(), rect.getHeight()); else if (rotation == 270) frm.concatCTM(0, -1, 1, 0, 0, rect.getWidth()); if (reuseAppearance) { AcroFields af = writer.getAcroFields(); PdfIndirectReference ref = af.getNormalAppearance(getFieldName()); if (ref != null) { frm.addTemplateReference(ref, new PdfName("n0"), 1, 0, 0, 1, 0, 0); } else { reuseAppearance = false; if (app[0] == null) { createBlankN0(); } } } if (!reuseAppearance) { frm.addTemplate(app[0], 0, 0); } if (!acro6Layers) frm.addTemplate(app[1], scale, 0, 0, scale, x, y); frm.addTemplate(app[2], 0, 0); if (!acro6Layers) { frm.addTemplate(app[3], scale, 0, 0, scale, x, y); frm.addTemplate(app[4], 0, 0); } } PdfTemplate napp = new PdfTemplate(writer); napp.setBoundingBox(rotated); writer.addDirectTemplateSimple(napp, null); napp.addTemplate(frm, 0, 0); return napp; } private void createBlankN0() { PdfTemplate t = app[0] = new PdfTemplate(writer); t.setBoundingBox(new Rectangle(100, 100)); writer.addDirectTemplateSimple(t, new PdfName("n0")); t.setLiteral("% DSBlank\n"); } /* * Creating the signed file. */ /** The PdfStamper that creates the signed PDF. */ private PdfStamper stamper; /** * Gets the PdfStamper associated with this instance. * @return the PdfStamper associated with this instance */ public PdfStamper getStamper() { return stamper; } /** * Sets the PdfStamper * @param stamper PdfStamper */ void setStamper(PdfStamper stamper) { this.stamper = stamper; } /** The PdfStamperImp object corresponding with the stamper. */ private PdfStamperImp writer; /** A byte buffer containing the bytes of the Stamper. */ private ByteBuffer sigout; /** * Getter for the byte buffer. */ ByteBuffer getSigout() { return sigout; } /** * Setter for the byte buffer. */ void setSigout(ByteBuffer sigout) { this.sigout = sigout; } /** OutputStream for the bytes of the stamper. */ private OutputStream originalout; /** * Getter for the OutputStream. */ OutputStream getOriginalout() { return originalout; } /** * Setter for the OutputStream. */ void setOriginalout(OutputStream originalout) { this.originalout = originalout; } /** Temporary file in case you don't want to sign in memory. */ private File tempFile; /** * Gets the temporary file. * @return the temporary file or null is the document is created in memory */ public File getTempFile() { return tempFile; } /** * Setter for the temporary file. * @param tempFile */ void setTempFile(File tempFile) { this.tempFile = tempFile; } /** Name and content of keys that can only be added in the close() method. */ private HashMap exclusionLocations; /** Length of the output. */ private int boutLen; /** Indicates if the stamper has already been pre-closed. */ private boolean preClosed = false; /** Signature field lock dictionary */ private PdfSigLockDictionary fieldLock; /** * Getter for the field lock dictionary. * @return Field lock dictionary. */ public PdfSigLockDictionary getFieldLockDict() { return fieldLock; } /** * Setter for the field lock dictionary. *

Be aware: if a signature is created on an existing signature field, * then its /Lock dictionary takes the precedence (if it exists).

* * @param fieldLock Field lock dictionary. */ public void setFieldLockDict(PdfSigLockDictionary fieldLock) { this.fieldLock = fieldLock; } /** * Checks if the document is in the process of closing. * @return true if the document is in the process of closing, * false otherwise */ public boolean isPreClosed() { return preClosed; } /** * This is the first method to be called when using external signatures. The general sequence is: * preClose(), getDocumentBytes() and close(). *

* If calling preClose() dont't call PdfStamper.close(). *

* exclusionSizes must contain at least * the PdfName.CONTENTS key with the size that it will take in the * document. Note that due to the hex string coding this size should be * byte_size*2+2. * @param exclusionSizes a HashMap with names and sizes to be excluded in the signature * calculation. The key is a PdfName and the value an * Integer. At least the PdfName.CONTENTS must be present * @throws IOException on error * @throws DocumentException on error */ public void preClose(HashMap exclusionSizes) throws IOException, DocumentException { if (preClosed) throw new DocumentException(MessageLocalization.getComposedMessage("document.already.pre.closed")); stamper.mergeVerification(); preClosed = true; AcroFields af = writer.getAcroFields(); String name = getFieldName(); boolean fieldExists = af.doesSignatureFieldExist(name); PdfIndirectReference refSig = writer.getPdfIndirectReference(); writer.setSigFlags(3); PdfDictionary fieldLock = null; if (fieldExists) { PdfDictionary widget = af.getFieldItem(name).getWidget(0); writer.markUsed(widget); fieldLock = widget.getAsDict(PdfName.LOCK); if (fieldLock == null && this.fieldLock != null) { widget.put(PdfName.LOCK, writer.addToBody(this.fieldLock).getIndirectReference()); fieldLock = this.fieldLock; } widget.put(PdfName.P, writer.getPageReference(getPage())); widget.put(PdfName.V, refSig); PdfObject obj = PdfReader.getPdfObjectRelease(widget.get(PdfName.F)); int flags = 0; if (obj != null && obj.isNumber()) flags = ((PdfNumber)obj).intValue(); flags |= PdfAnnotation.FLAGS_LOCKED; widget.put(PdfName.F, new PdfNumber(flags)); PdfDictionary ap = new PdfDictionary(); ap.put(PdfName.N, getAppearance().getIndirectReference()); widget.put(PdfName.AP, ap); } else { PdfFormField sigField = PdfFormField.createSignature(writer); sigField.setFieldName(name); sigField.put(PdfName.V, refSig); sigField.setFlags(PdfAnnotation.FLAGS_PRINT | PdfAnnotation.FLAGS_LOCKED); if (this.fieldLock != null) { sigField.put(PdfName.LOCK, writer.addToBody(this.fieldLock).getIndirectReference()); fieldLock = this.fieldLock; } int pagen = getPage(); if (!isInvisible()) sigField.setWidget(getPageRect(), null); else sigField.setWidget(new Rectangle(0, 0), null); sigField.setAppearance(PdfAnnotation.APPEARANCE_NORMAL, getAppearance()); sigField.setPage(pagen); writer.addAnnotation(sigField, pagen); } exclusionLocations = new HashMap(); if (cryptoDictionary == null) { throw new DocumentException("No crypto dictionary defined."); } else { PdfLiteral lit = new PdfLiteral(80); exclusionLocations.put(PdfName.BYTERANGE, lit); cryptoDictionary.put(PdfName.BYTERANGE, lit); for (Map.Entry entry: exclusionSizes.entrySet()) { PdfName key = entry.getKey(); Integer v = entry.getValue(); lit = new PdfLiteral(v.intValue()); exclusionLocations.put(key, lit); cryptoDictionary.put(key, lit); } if (certificationLevel > 0) addDocMDP(cryptoDictionary); if (fieldLock != null) addFieldMDP(cryptoDictionary, fieldLock); if (signatureEvent != null) signatureEvent.getSignatureDictionary(cryptoDictionary); writer.addToBody(cryptoDictionary, refSig, false); } if (certificationLevel > 0) { // add DocMDP entry to root PdfDictionary docmdp = new PdfDictionary(); docmdp.put(new PdfName("DocMDP"), refSig); writer.reader.getCatalog().put(new PdfName("Perms"), docmdp); } writer.close(stamper.getMoreInfo()); range = new long[exclusionLocations.size() * 2]; long byteRangePosition = exclusionLocations.get(PdfName.BYTERANGE).getPosition(); exclusionLocations.remove(PdfName.BYTERANGE); int idx = 1; for (PdfLiteral lit: exclusionLocations.values()) { long n = lit.getPosition(); range[idx++] = n; range[idx++] = lit.getPosLength() + n; } Arrays.sort(range, 1, range.length - 1); for (int k = 3; k < range.length - 2; k += 2) range[k] -= range[k - 1]; if (tempFile == null) { bout = sigout.getBuffer(); boutLen = sigout.size(); range[range.length - 1] = boutLen - range[range.length - 2]; ByteBuffer bf = new ByteBuffer(); bf.append('['); for (int k = 0; k < range.length; ++k) bf.append(range[k]).append(' '); bf.append(']'); System.arraycopy(bf.getBuffer(), 0, bout, (int)byteRangePosition, bf.size()); } else { try { raf = new RandomAccessFile(tempFile, "rw"); long len = raf.length(); range[range.length - 1] = len - range[range.length - 2]; ByteBuffer bf = new ByteBuffer(); bf.append('['); for (int k = 0; k < range.length; ++k) bf.append(range[k]).append(' '); bf.append(']'); raf.seek(byteRangePosition); raf.write(bf.getBuffer(), 0, bf.size()); } catch (IOException e) { try{raf.close();}catch(Exception ee){} try{tempFile.delete();}catch(Exception ee){} throw e; } } } /** * Adds keys to the signature dictionary that define * the certification level and the permissions. * This method is only used for Certifying signatures. * @param crypto the signature dictionary */ private void addDocMDP(PdfDictionary crypto) { PdfDictionary reference = new PdfDictionary(); PdfDictionary transformParams = new PdfDictionary(); transformParams.put(PdfName.P, new PdfNumber(certificationLevel)); transformParams.put(PdfName.V, new PdfName("1.2")); transformParams.put(PdfName.TYPE, PdfName.TRANSFORMPARAMS); reference.put(PdfName.TRANSFORMMETHOD, PdfName.DOCMDP); reference.put(PdfName.TYPE, PdfName.SIGREF); reference.put(PdfName.TRANSFORMPARAMS, transformParams); if (writer.getPdfVersion().getVersion() < PdfWriter.VERSION_1_6) { reference.put(new PdfName("DigestValue"), new PdfString("aa")); PdfArray loc = new PdfArray(); loc.add(new PdfNumber(0)); loc.add(new PdfNumber(0)); reference.put(new PdfName("DigestLocation"), loc); reference.put(new PdfName("DigestMethod"), new PdfName("MD5")); } reference.put(PdfName.DATA, writer.reader.getTrailer().get(PdfName.ROOT)); PdfArray types = new PdfArray(); types.add(reference); crypto.put(PdfName.REFERENCE, types); } /** * Adds keys to the signature dictionary that define * the field permissions. * This method is only used for signatures that lock fields. * @param crypto the signature dictionary */ private void addFieldMDP(PdfDictionary crypto, PdfDictionary fieldLock) { PdfDictionary reference = new PdfDictionary(); PdfDictionary transformParams = new PdfDictionary(); transformParams.putAll(fieldLock); transformParams.put(PdfName.TYPE, PdfName.TRANSFORMPARAMS); transformParams.put(PdfName.V, new PdfName("1.2")); reference.put(PdfName.TRANSFORMMETHOD, PdfName.FIELDMDP); reference.put(PdfName.TYPE, PdfName.SIGREF); reference.put(PdfName.TRANSFORMPARAMS, transformParams); reference.put(new PdfName("DigestValue"), new PdfString("aa")); PdfArray loc = new PdfArray(); loc.add(new PdfNumber(0)); loc.add(new PdfNumber(0)); reference.put(new PdfName("DigestLocation"), loc); reference.put(new PdfName("DigestMethod"), new PdfName("MD5")); reference.put(PdfName.DATA, writer.reader.getTrailer().get(PdfName.ROOT)); PdfArray types = crypto.getAsArray(PdfName.REFERENCE); if (types == null) types = new PdfArray(); types.add(reference); crypto.put(PdfName.REFERENCE, types); } /** * This is the last method to be called when using external signatures. The general sequence is: * preClose(), getDocumentBytes() and close(). *

* update is a PdfDictionary that must have exactly the * same keys as the ones provided in {@link #preClose(HashMap)}. * @param update a PdfDictionary with the key/value that will fill the holes defined * in {@link #preClose(HashMap)} * @throws DocumentException on error * @throws IOException on error */ public void close(PdfDictionary update) throws IOException, DocumentException { try { if (!preClosed) throw new DocumentException(MessageLocalization.getComposedMessage("preclose.must.be.called.first")); ByteBuffer bf = new ByteBuffer(); for (PdfName key: update.getKeys()) { PdfObject obj = update.get(key); PdfLiteral lit = exclusionLocations.get(key); if (lit == null) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.key.1.didn.t.reserve.space.in.preclose", key.toString())); bf.reset(); obj.toPdf(null, bf); if (bf.size() > lit.getPosLength()) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.key.1.is.too.big.is.2.reserved.3", key.toString(), String.valueOf(bf.size()), String.valueOf(lit.getPosLength()))); if (tempFile == null) System.arraycopy(bf.getBuffer(), 0, bout, (int)lit.getPosition(), bf.size()); else { raf.seek(lit.getPosition()); raf.write(bf.getBuffer(), 0, bf.size()); } } if (update.size() != exclusionLocations.size()) throw new IllegalArgumentException(MessageLocalization.getComposedMessage("the.update.dictionary.has.less.keys.than.required")); if (tempFile == null) { originalout.write(bout, 0, boutLen); } else { if (originalout != null) { raf.seek(0); long length = raf.length(); byte buf[] = new byte[8192]; while (length > 0) { int r = raf.read(buf, 0, (int)Math.min((long)buf.length, length)); if (r < 0) throw new EOFException(MessageLocalization.getComposedMessage("unexpected.eof")); originalout.write(buf, 0, r); length -= r; } } } } finally { writer.reader.close(); if (tempFile != null) { try{raf.close();}catch(Exception ee){} if (originalout != null) try{tempFile.delete();}catch(Exception ee){} } if (originalout != null) try{originalout.close();}catch(Exception e){} } } }





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