com.itextpdf.pdfa.checker.PdfA1Checker Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2018 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.pdfa.checker;
import com.itextpdf.io.font.PdfEncodings;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfTrueTypeFont;
import com.itextpdf.kernel.pdf.canvas.CanvasGraphicsState;
import com.itextpdf.kernel.colors.Color;
import com.itextpdf.kernel.pdf.PdfAConformanceLevel;
import com.itextpdf.kernel.pdf.PdfArray;
import com.itextpdf.kernel.pdf.PdfBoolean;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfNumber;
import com.itextpdf.kernel.pdf.PdfObject;
import com.itextpdf.kernel.pdf.PdfStream;
import com.itextpdf.kernel.pdf.PdfString;
import com.itextpdf.kernel.pdf.annot.PdfAnnotation;
import com.itextpdf.kernel.pdf.colorspace.PdfColorSpace;
import com.itextpdf.kernel.pdf.colorspace.PdfDeviceCs;
import com.itextpdf.kernel.pdf.colorspace.PdfSpecialCs;
import com.itextpdf.pdfa.PdfAConformanceException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import com.itextpdf.pdfa.PdfAConformanceLogMessageConstant;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* PdfA1Checker defines the requirements of the PDF/A-1 standard and contains
* method implementations from the abstract {@link PdfAChecker} class.
*
* The specification implemented by this class is ISO 19005-1
*/
public class PdfA1Checker extends PdfAChecker {
protected static final Set forbiddenAnnotations = new HashSet<>(Arrays.asList(PdfName.Sound, PdfName.Movie, PdfName.FileAttachment));
protected static final Set contentAnnotations = new HashSet<>(Arrays.asList(PdfName.Text,
PdfName.FreeText, PdfName.Line, PdfName.Square, PdfName.Circle, PdfName.Stamp, PdfName.Ink, PdfName.Popup));
protected static final Set forbiddenActions = new HashSet<>(Arrays.asList(PdfName.Launch, PdfName.Sound, PdfName.Movie,
PdfName.ResetForm, PdfName.ImportData, PdfName.JavaScript, PdfName.Hide));
protected static final Set allowedNamedActions = new HashSet<>(Arrays.asList(PdfName.NextPage,
PdfName.PrevPage, PdfName.FirstPage, PdfName.LastPage));
protected static final Set allowedRenderingIntents = new HashSet<>(Arrays.asList(PdfName.RelativeColorimetric,
PdfName.AbsoluteColorimetric, PdfName.Perceptual, PdfName.Saturation));
private static final long serialVersionUID = 5103027349795298132L;
/**
* Creates a PdfA1Checker with the required conformance level
*
* @param conformanceLevel the required conformance level, a or
* b
*/
public PdfA1Checker(PdfAConformanceLevel conformanceLevel) {
super(conformanceLevel);
}
@Override
public void checkCanvasStack(char stackOperation) {
if ('q' == stackOperation) {
if (++gsStackDepth > PdfA1Checker.maxGsStackDepth)
throw new PdfAConformanceException(PdfAConformanceException.GRAPHICS_STATE_STACK_DEPTH_IS_GREATER_THAN_28);
} else if ('Q' == stackOperation) {
gsStackDepth--;
}
}
@Override
public void checkInlineImage(PdfStream inlineImage, PdfDictionary currentColorSpaces) {
PdfObject filter = inlineImage.get(PdfName.Filter);
if (filter instanceof PdfName) {
if (filter.equals(PdfName.LZWDecode)) {
throw new PdfAConformanceException(PdfAConformanceException.LZWDECODE_FILTER_IS_NOT_PERMITTED);
}
} else if (filter instanceof PdfArray) {
for (int i = 0; i < ((PdfArray) filter).size(); i++) {
PdfName f = ((PdfArray) filter).getAsName(i);
if (f.equals(PdfName.LZWDecode)) {
throw new PdfAConformanceException(PdfAConformanceException.LZWDECODE_FILTER_IS_NOT_PERMITTED);
}
}
}
checkImage(inlineImage, currentColorSpaces);
}
@Override
public void checkColor(Color color, PdfDictionary currentColorSpaces, Boolean fill) {
checkColorSpace(color.getColorSpace(), currentColorSpaces, true, fill);
}
@Override
public void checkColorSpace(PdfColorSpace colorSpace, PdfDictionary currentColorSpaces, boolean checkAlternate, Boolean fill) {
if (colorSpace instanceof PdfSpecialCs.Separation) {
colorSpace = ((PdfSpecialCs.Separation) colorSpace).getBaseCs();
} else if (colorSpace instanceof PdfSpecialCs.DeviceN) {
colorSpace = ((PdfSpecialCs.DeviceN) colorSpace).getBaseCs();
}
if (colorSpace instanceof PdfDeviceCs.Rgb) {
if (cmykIsUsed) {
throw new PdfAConformanceException(PdfAConformanceException.DEVICERGB_AND_DEVICECMYK_COLORSPACES_CANNOT_BE_USED_BOTH_IN_ONE_FILE);
}
rgbIsUsed = true;
} else if (colorSpace instanceof PdfDeviceCs.Cmyk) {
if (rgbIsUsed) {
throw new PdfAConformanceException(PdfAConformanceException.DEVICERGB_AND_DEVICECMYK_COLORSPACES_CANNOT_BE_USED_BOTH_IN_ONE_FILE);
}
cmykIsUsed = true;
} else if (colorSpace instanceof PdfDeviceCs.Gray) {
grayIsUsed = true;
}
}
@Override
protected Set getForbiddenActions() {
return forbiddenActions;
}
@Override
protected Set getAllowedNamedActions() {
return allowedNamedActions;
}
@Override
protected void checkColorsUsages() {
if ((rgbIsUsed || cmykIsUsed || grayIsUsed) && pdfAOutputIntentColorSpace == null) {
throw new PdfAConformanceException(PdfAConformanceException.IF_DEVICE_RGB_CMYK_GRAY_USED_IN_FILE_THAT_FILE_SHALL_CONTAIN_PDFA_OUTPUTINTENT);
}
if (rgbIsUsed) {
if (!ICC_COLOR_SPACE_RGB.equals(pdfAOutputIntentColorSpace)) {
throw new PdfAConformanceException(PdfAConformanceException.DEVICERGB_MAY_BE_USED_ONLY_IF_THE_FILE_HAS_A_RGB_PDFA_OUTPUT_INTENT);
}
}
if (cmykIsUsed) {
if (!ICC_COLOR_SPACE_CMYK.equals(pdfAOutputIntentColorSpace)) {
throw new PdfAConformanceException(PdfAConformanceException.DEVICECMYK_MAY_BE_USED_ONLY_IF_THE_FILE_HAS_A_CMYK_PDFA_OUTPUT_INTENT);
}
}
}
@Override
public void checkExtGState(CanvasGraphicsState extGState) {
if (extGState.getTransferFunction() != null) {
throw new PdfAConformanceException(PdfAConformanceException.AN_EXTGSTATE_DICTIONARY_SHALL_NOT_CONTAIN_THE_TR_KEY);
}
PdfObject transferFunction2 = extGState.getTransferFunction2();
if (transferFunction2 != null && !PdfName.Default.equals(transferFunction2)) {
throw new PdfAConformanceException(PdfAConformanceException.AN_EXTGSTATE_DICTIONARY_SHALL_NOT_CONTAIN_THE_TR_2_KEY_WITH_A_VALUE_OTHER_THAN_DEFAULT);
}
checkRenderingIntent(extGState.getRenderingIntent());
PdfObject softMask = extGState.getSoftMask();
if (softMask != null && !PdfName.None.equals(softMask)) {
throw new PdfAConformanceException(PdfAConformanceException.THE_SMASK_KEY_IS_NOT_ALLOWED_IN_EXTGSTATE);
}
PdfObject bm = extGState.getBlendMode();
if (bm != null && !PdfName.Normal.equals(bm) && !PdfName.Compatible.equals(bm)) {
throw new PdfAConformanceException(PdfAConformanceException.BLEND_MODE_SHALL_HAVE_VALUE_NORMAL_OR_COMPATIBLE);
}
Float ca = extGState.getStrokeOpacity();
if (ca != null && ca != 1) {
throw new PdfAConformanceException(PdfAConformanceException.TRANSPARENCY_IS_NOT_ALLOWED_CA_SHALL_BE_EQUAL_TO_1);
}
ca = extGState.getFillOpacity();
if (ca != null && ca != 1) {
throw new PdfAConformanceException(PdfAConformanceException.TRANSPARENCY_IS_NOT_ALLOWED_AND_CA_SHALL_BE_EQUAL_TO_1);
}
}
@Override
public void checkRenderingIntent(PdfName intent) {
if (intent == null)
return;
if (!allowedRenderingIntents.contains(intent)) {
throw new PdfAConformanceException(PdfAConformanceException.IF_SPECIFIED_RENDERING_SHALL_BE_ONE_OF_THE_FOLLOWING_RELATIVECOLORIMETRIC_ABSOLUTECOLORIMETRIC_PERCEPTUAL_OR_SATURATION);
}
}
@Override
public void checkFont(PdfFont pdfFont) {
if (!pdfFont.isEmbedded()) {
throw new PdfAConformanceException(PdfAConformanceException.ALL_THE_FONTS_MUST_BE_EMBEDDED_THIS_ONE_IS_NOT_0)
.setMessageParams(pdfFont.getFontProgram().getFontNames().getFontName());
}
if (pdfFont instanceof PdfTrueTypeFont) {
PdfTrueTypeFont trueTypeFont = (PdfTrueTypeFont) pdfFont;
boolean symbolic = trueTypeFont.getFontEncoding().isFontSpecific();
if (symbolic) {
checkSymbolicTrueTypeFont(trueTypeFont);
} else {
checkNonSymbolicTrueTypeFont(trueTypeFont);
}
}
}
@Override
protected void checkNonSymbolicTrueTypeFont(PdfTrueTypeFont trueTypeFont) {
String encoding = trueTypeFont.getFontEncoding().getBaseEncoding();
// non-symbolic true type font will always has an encoding entry in font dictionary in itext7
if (!PdfEncodings.WINANSI.equals(encoding) && !encoding.equals(PdfEncodings.MACROMAN) || trueTypeFont.getFontEncoding().hasDifferences()) {
throw new PdfAConformanceException(PdfAConformanceException.ALL_NON_SYMBOLIC_TRUE_TYPE_FONT_SHALL_SPECIFY_MAC_ROMAN_OR_WIN_ANSI_ENCODING_AS_THE_ENCODING_ENTRY, trueTypeFont);
}
}
@Override
protected void checkSymbolicTrueTypeFont(PdfTrueTypeFont trueTypeFont) {
if (trueTypeFont.getFontEncoding().hasDifferences()) {
throw new PdfAConformanceException(PdfAConformanceException.ALL_SYMBOLIC_TRUE_TYPE_FONTS_SHALL_NOT_SPECIFY_ENCODING);
}
// if symbolic font encoding doesn't have differences, itext7 won't write encoding for such font
}
@Override
protected void checkImage(PdfStream image, PdfDictionary currentColorSpaces) {
PdfColorSpace colorSpace = null;
if (isAlreadyChecked(image)) {
colorSpace = checkedObjectsColorspace.get(image);
checkColorSpace(colorSpace, currentColorSpaces, true, null);
return;
}
PdfObject colorSpaceObj = image.get(PdfName.ColorSpace);
if (colorSpaceObj != null) {
colorSpace = PdfColorSpace.makeColorSpace(colorSpaceObj);
checkColorSpace(colorSpace, currentColorSpaces, true, null);
checkedObjectsColorspace.put(image, colorSpace);
}
if (image.containsKey(PdfName.Alternates)) {
throw new PdfAConformanceException(PdfAConformanceException.AN_IMAGE_DICTIONARY_SHALL_NOT_CONTAIN_ALTERNATES_KEY);
}
if (image.containsKey(PdfName.OPI)) {
throw new PdfAConformanceException(PdfAConformanceException.AN_IMAGE_DICTIONARY_SHALL_NOT_CONTAIN_OPI_KEY);
}
if (image.containsKey(PdfName.Interpolate) && (boolean) image.getAsBool(PdfName.Interpolate)) {
throw new PdfAConformanceException(PdfAConformanceException.THE_VALUE_OF_INTERPOLATE_KEY_SHALL_BE_FALSE);
}
checkRenderingIntent(image.getAsName(PdfName.Intent));
if (image.containsKey(PdfName.SMask) && !PdfName.None.equals(image.getAsName(PdfName.SMask))) {
throw new PdfAConformanceException(PdfAConformanceException.THE_SMASK_KEY_IS_NOT_ALLOWED_IN_XOBJECTS);
}
}
@Override
protected void checkFormXObject(PdfStream form) {
if (isAlreadyChecked(form)) return;
if (form.containsKey(PdfName.OPI)) {
throw new PdfAConformanceException(PdfAConformanceException.A_FORM_XOBJECT_DICTIONARY_SHALL_NOT_CONTAIN_OPI_KEY);
}
if (form.containsKey(PdfName.PS)) {
throw new PdfAConformanceException(PdfAConformanceException.A_FORM_XOBJECT_DICTIONARY_SHALL_NOT_CONTAIN_PS_KEY);
}
if (PdfName.PS.equals(form.getAsName(PdfName.Subtype2))) {
throw new PdfAConformanceException(PdfAConformanceException.A_FORM_XOBJECT_DICTIONARY_SHALL_NOT_CONTAIN_SUBTYPE2_KEY_WITH_A_VALUE_OF_PS);
}
if (form.containsKey(PdfName.SMask) && !PdfName.None.equals(form.getAsName(PdfName.SMask))) {
throw new PdfAConformanceException(PdfAConformanceException.THE_SMASK_KEY_IS_NOT_ALLOWED_IN_XOBJECTS);
}
if (form.containsKey(PdfName.Group) && PdfName.Transparency.equals(form.getAsDictionary(PdfName.Group).getAsName(PdfName.S))) {
throw new PdfAConformanceException(PdfAConformanceException.A_GROUP_OBJECT_WITH_AN_S_KEY_WITH_A_VALUE_OF_TRANSPARENCY_SHALL_NOT_BE_INCLUDED_IN_A_FORM_XOBJECT);
}
checkResources(form.getAsDictionary(PdfName.Resources));
}
@Override
protected void checkLogicalStructure(PdfDictionary catalog) {
if (checkStructure(conformanceLevel)) {
PdfDictionary markInfo = catalog.getAsDictionary(PdfName.MarkInfo);
if (markInfo == null || markInfo.getAsBoolean(PdfName.Marked) == null || !markInfo.getAsBoolean(PdfName.Marked).getValue()) {
throw new PdfAConformanceException(PdfAConformanceException.A_CATALOG_SHALL_INCLUDE_MARK_INFO_DICTIONARY_WITH_MARKED_TRUE_VALUE);
}
if (!catalog.containsKey(PdfName.Lang)) {
Logger logger = LoggerFactory.getLogger(PdfAChecker.class);
logger.warn(PdfAConformanceLogMessageConstant.CATALOG_SHOULD_CONTAIN_LANG_ENTRY);
}
}
}
@Override
protected void checkMetaData(PdfDictionary catalog) {
if (!catalog.containsKey(PdfName.Metadata)) {
throw new PdfAConformanceException(PdfAConformanceException.A_CATALOG_DICTIONARY_SHALL_CONTAIN_METADATA_ENTRY);
}
}
@Override
protected void checkOutputIntents(PdfDictionary catalog) {
PdfArray outputIntents = catalog.getAsArray(PdfName.OutputIntents);
if (outputIntents == null)
return;
int i;
PdfObject destOutputProfile = null;
for (i = 0; i < outputIntents.size() && destOutputProfile == null; ++i) {
destOutputProfile = outputIntents.getAsDictionary(i).get(PdfName.DestOutputProfile);
}
for (; i < outputIntents.size(); ++i) {
PdfObject otherDestOutputProfile = outputIntents.getAsDictionary(i).get(PdfName.DestOutputProfile);
if (otherDestOutputProfile != null && destOutputProfile != otherDestOutputProfile) {
throw new PdfAConformanceException(PdfAConformanceException.IF_OUTPUTINTENTS_ARRAY_HAS_MORE_THAN_ONE_ENTRY_WITH_DESTOUTPUTPROFILE_KEY_THE_SAME_INDIRECT_OBJECT_SHALL_BE_USED_AS_THE_VALUE_OF_THAT_OBJECT);
}
}
}
@Override
protected void checkPdfNumber(PdfNumber number) {
if (Math.abs(number.longValue()) > getMaxRealValue() && number.toString().contains(".")) {
throw new PdfAConformanceException(PdfAConformanceException.REAL_NUMBER_IS_OUT_OF_RANGE);
}
}
protected double getMaxRealValue() {
return 32767;
}
@Override
protected void checkPdfStream(PdfStream stream) {
if (stream.containsKey(PdfName.F) || stream.containsKey(PdfName.FFilter) || stream.containsKey(PdfName.FDecodeParams)) {
throw new PdfAConformanceException(PdfAConformanceException.STREAM_OBJECT_DICTIONARY_SHALL_NOT_CONTAIN_THE_F_FFILTER_OR_FDECODEPARAMS_KEYS);
}
PdfObject filter = stream.get(PdfName.Filter);
if (filter instanceof PdfName) {
if (filter.equals(PdfName.LZWDecode))
throw new PdfAConformanceException(PdfAConformanceException.LZWDECODE_FILTER_IS_NOT_PERMITTED);
} else if (filter instanceof PdfArray) {
for (PdfObject f : ((PdfArray) filter)) {
if (f.equals(PdfName.LZWDecode))
throw new PdfAConformanceException(PdfAConformanceException.LZWDECODE_FILTER_IS_NOT_PERMITTED);
}
}
}
@Override
protected void checkPdfString(PdfString string) {
if (string.getValueBytes().length > getMaxStringLength()) {
throw new PdfAConformanceException(PdfAConformanceException.PDF_STRING_IS_TOO_LONG);
}
}
protected int getMaxStringLength() {
return 65535;
}
@Override
protected void checkPageSize(PdfDictionary page) {
}
@Override
protected void checkFileSpec(PdfDictionary fileSpec) {
if (fileSpec.containsKey(PdfName.EF)) {
throw new PdfAConformanceException(PdfAConformanceException.FILE_SPECIFICATION_DICTIONARY_SHALL_NOT_CONTAIN_THE_EF_KEY);
}
}
@Override
protected void checkAnnotation(PdfDictionary annotDic) {
PdfName subtype = annotDic.getAsName(PdfName.Subtype);
if (subtype == null) {
throw new PdfAConformanceException(PdfAConformanceException.ANNOTATION_TYPE_0_IS_NOT_PERMITTED).setMessageParams("null");
}
if (forbiddenAnnotations.contains(subtype)) {
throw new PdfAConformanceException(PdfAConformanceException.ANNOTATION_TYPE_0_IS_NOT_PERMITTED).setMessageParams(subtype.getValue());
}
PdfNumber ca = annotDic.getAsNumber(PdfName.CA);
if (ca != null && ca.floatValue() != 1.0) {
throw new PdfAConformanceException(PdfAConformanceException.AN_ANNOTATION_DICTIONARY_SHALL_NOT_CONTAIN_THE_CA_KEY_WITH_A_VALUE_OTHER_THAN_1);
}
if (!annotDic.containsKey(PdfName.F)) {
throw new PdfAConformanceException(PdfAConformanceException.AN_ANNOTATION_DICTIONARY_SHALL_CONTAIN_THE_F_KEY);
}
int flags = (int) annotDic.getAsInt(PdfName.F);
if (!checkFlag(flags, PdfAnnotation.PRINT) || checkFlag(flags, PdfAnnotation.HIDDEN) || checkFlag(flags, PdfAnnotation.INVISIBLE) ||
checkFlag(flags, PdfAnnotation.NO_VIEW)) {
throw new PdfAConformanceException(PdfAConformanceException.THE_F_KEYS_PRINT_FLAG_BIT_SHALL_BE_SET_TO_1_AND_ITS_HIDDEN_INVISIBLE_AND_NOVIEW_FLAG_BITS_SHALL_BE_SET_TO_0);
}
if (subtype.equals(PdfName.Text) && (!checkFlag(flags, PdfAnnotation.NO_ZOOM) || !checkFlag(flags, PdfAnnotation.NO_ROTATE))) {
throw new PdfAConformanceException(PdfAConformanceLogMessageConstant.TEXT_ANNOTATIONS_SHOULD_SET_THE_NOZOOM_AND_NOROTATE_FLAG_BITS_OF_THE_F_KEY_TO_1);
}
if (annotDic.containsKey(PdfName.C) || annotDic.containsKey(PdfName.IC)) {
if (!ICC_COLOR_SPACE_RGB.equals(pdfAOutputIntentColorSpace)) {
throw new PdfAConformanceException(PdfAConformanceException.DESTOUTPUTPROFILE_IN_THE_PDFA1_OUTPUTINTENT_DICTIONARY_SHALL_BE_RGB);
}
}
PdfDictionary ap = annotDic.getAsDictionary(PdfName.AP);
if (ap != null) {
if (ap.containsKey(PdfName.D) || ap.containsKey(PdfName.R)) {
throw new PdfAConformanceException(PdfAConformanceException.APPEARANCE_DICTIONARY_SHALL_CONTAIN_ONLY_THE_N_KEY_WITH_STREAM_VALUE);
}
PdfStream n = ap.getAsStream(PdfName.N);
if (n == null) {
throw new PdfAConformanceException(PdfAConformanceException.APPEARANCE_DICTIONARY_SHALL_CONTAIN_ONLY_THE_N_KEY_WITH_STREAM_VALUE);
}
checkResourcesOfAppearanceStreams(ap);
}
if (PdfName.Widget.equals(subtype) && (annotDic.containsKey(PdfName.AA) || annotDic.containsKey(PdfName.A))) {
throw new PdfAConformanceException(PdfAConformanceException.WIDGET_ANNOTATION_DICTIONARY_OR_FIELD_DICTIONARY_SHALL_NOT_INCLUDE_A_OR_AA_ENTRY);
}
if (annotDic.containsKey(PdfName.AA)) {
throw new PdfAConformanceException(PdfAConformanceException.AN_ANNOTATION_DICTIONARY_SHALL_NOT_CONTAIN_AA_KEY);
}
if (checkStructure(conformanceLevel)) {
if (contentAnnotations.contains(subtype) && !annotDic.containsKey(PdfName.Contents)) {
throw new PdfAConformanceException(PdfAConformanceException.ANNOTATION_OF_TYPE_0_SHOULD_HAVE_CONTENTS_KEY).setMessageParams(subtype.getValue());
}
}
}
@Override
protected void checkForm(PdfDictionary form) {
if (form == null)
return;
PdfBoolean needAppearances = form.getAsBoolean(PdfName.NeedAppearances);
if (needAppearances != null && needAppearances.getValue()) {
throw new PdfAConformanceException(PdfAConformanceException.NEEDAPPEARANCES_FLAG_OF_THE_INTERACTIVE_FORM_DICTIONARY_SHALL_EITHER_NOT_BE_PRESENTED_OR_SHALL_BE_FALSE);
}
checkResources(form.getAsDictionary(PdfName.DR));
PdfArray fields = form.getAsArray(PdfName.Fields);
if (fields != null) {
fields = getFormFields(fields);
for (PdfObject field : fields) {
PdfDictionary fieldDic = (PdfDictionary) field;
if (fieldDic.containsKey(PdfName.A) || fieldDic.containsKey(PdfName.AA)) {
throw new PdfAConformanceException(PdfAConformanceException.WIDGET_ANNOTATION_DICTIONARY_OR_FIELD_DICTIONARY_SHALL_NOT_INCLUDE_A_OR_AA_ENTRY);
}
checkResources(fieldDic.getAsDictionary(PdfName.DR));
}
}
}
protected void checkAction(PdfDictionary action) {
if (isAlreadyChecked(action)) return;
PdfName s = action.getAsName(PdfName.S);
if (getForbiddenActions().contains(s)) {
throw new PdfAConformanceException(PdfAConformanceException._0_ACTIONS_ARE_NOT_ALLOWED).setMessageParams(s.getValue());
}
if (s.equals(PdfName.Named)) {
PdfName n = action.getAsName(PdfName.N);
if (n != null && !getAllowedNamedActions().contains(n)) {
throw new PdfAConformanceException(PdfAConformanceException.NAMED_ACTION_TYPE_0_IS_NOT_ALLOWED).setMessageParams(n.getValue());
}
}
if (s.equals(PdfName.SetState) || s.equals(PdfName.NoOp)) {
throw new PdfAConformanceException(PdfAConformanceException.DEPRECATED_SETSTATE_AND_NOOP_ACTIONS_ARE_NOT_ALLOWED);
}
}
@Override
protected void checkCatalogValidEntries(PdfDictionary catalogDict) {
if (catalogDict.containsKey(PdfName.AA)) {
throw new PdfAConformanceException(PdfAConformanceException.A_CATALOG_DICTIONARY_SHALL_NOT_CONTAIN_AA_ENTRY);
}
if (catalogDict.containsKey(PdfName.OCProperties)) {
throw new PdfAConformanceException(PdfAConformanceException.A_CATALOG_DICTIONARY_SHALL_NOT_CONTAIN_OCPROPERTIES_KEY);
}
if (catalogDict.containsKey(PdfName.Names)) {
if (catalogDict.getAsDictionary(PdfName.Names).containsKey(PdfName.EmbeddedFiles)) {
throw new PdfAConformanceException(PdfAConformanceException.A_NAME_DICTIONARY_SHALL_NOT_CONTAIN_THE_EMBEDDED_FILES_KEY);
}
}
}
@Override
protected void checkPageObject(PdfDictionary pageDict, PdfDictionary pageResources) {
PdfDictionary actions = pageDict.getAsDictionary(PdfName.AA);
if (actions != null) {
for (PdfName key : actions.keySet()) {
PdfDictionary action = actions.getAsDictionary(key);
checkAction(action);
}
}
if (pageDict.containsKey(PdfName.Group) && PdfName.Transparency.equals(pageDict.getAsDictionary(PdfName.Group).getAsName(PdfName.S))) {
throw new PdfAConformanceException(PdfAConformanceException.A_GROUP_OBJECT_WITH_AN_S_KEY_WITH_A_VALUE_OF_TRANSPARENCY_SHALL_NOT_BE_INCLUDED_IN_A_PAGE_XOBJECT);
}
}
@Override
protected void checkTrailer(PdfDictionary trailer) {
if (trailer.containsKey(PdfName.Encrypt)) {
throw new PdfAConformanceException(PdfAConformanceException.KEYWORD_ENCRYPT_SHALL_NOT_BE_USED_IN_THE_TRAILER_DICTIONARY);
}
}
protected PdfArray getFormFields(PdfArray array) {
PdfArray fields = new PdfArray();
for (PdfObject field : array) {
PdfArray kids = ((PdfDictionary) field).getAsArray(PdfName.Kids);
fields.add(field);
if (kids != null) {
fields.addAll(getFormFields(kids));
}
}
return fields;
}
}