/*******************************************************************************
* Copyright 2010 Atos Worldline SAS
*
* Licensed by Atos Worldline SAS under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* Atos Worldline SAS licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
/**
*
*/
package net.padaf.preflight.font;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import net.padaf.preflight.DocumentHandler;
import net.padaf.preflight.ValidationConstants;
import net.padaf.preflight.ValidationException;
import net.padaf.preflight.ValidationResult.ValidationError;
import net.padaf.preflight.font.AbstractFontContainer.State;
import net.padaf.xmpbox.XMPMetadata;
import net.padaf.xmpbox.parser.XMPDocumentBuilder;
import net.padaf.xmpbox.parser.XmpExpectedRdfAboutAttribute;
import net.padaf.xmpbox.parser.XmpParsingException;
import net.padaf.xmpbox.parser.XmpSchemaException;
import net.padaf.xmpbox.parser.XmpUnknownValueTypeException;
import net.padaf.xmpbox.parser.XmpXpacketEndException;
import net.padaf.xmpbox.type.BadFieldValueException;
import org.apache.commons.io.IOUtils;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSObject;
import org.apache.pdfbox.pdmodel.common.PDMetadata;
import org.apache.pdfbox.pdmodel.common.PDStream;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDFontDescriptor;
import org.apache.pdfbox.pdmodel.font.PDFontFactory;
public abstract class AbstractFontValidator implements FontValidator,ValidationConstants {
/**
* DocumentHandler which contains all useful objects to validate a PDF/A ex :
* parser JavaCC
*/
protected DocumentHandler handler = null;
/**
* The COSObject which is the starting point of the Font description in the
* PDF/A file. This object should be an insteance of COSDictionary
*/
protected COSObject cObj = null;
/**
* The cObj casted as COSDictionary
*/
protected COSDictionary fDictionary = null;
/**
* The PdfBox font dictionary wrapper.
*/
protected PDFont pFont = null;
/**
* The Font Container contains the Font Validation state ( valid or not,
* why...) This Font Container is tested when the font is used as resource.
* According to the state of this font, the PDF File will be PDF/A conforming
* file or not. (Ex : if the FontContainer flags this font as not embedded,
* the PDF is a PDF/A only if the font is used in a Rendering Mode 3.)
*/
protected AbstractFontContainer fontContainer = null;
/**
* Abstract Constructor
* @param handler the handled document
* @param cObj The cos object representing the font
* @throws ValidationException when object creation fails
*/
public AbstractFontValidator(DocumentHandler handler, COSObject cObj)
throws ValidationException {
try {
this.handler = handler;
this.cObj = cObj;
this.fDictionary = (COSDictionary) cObj.getObject();
this.pFont = PDFontFactory.createFont(fDictionary);
this.fontContainer = instanciateContainer(this.pFont);
this.handler.addFont(this.pFont.getCOSObject(), this.fontContainer);
} catch (IOException e) {
throw new ValidationException(
"Unable to instantiate a FontValidator object : " + e.getMessage());
}
}
protected AbstractFontContainer instanciateContainer (PDFont fd) {
String subtype = fd.getSubType();
if (FONT_DICTIONARY_VALUE_TRUETYPE.equals(subtype)) {
return new TrueTypeFontContainer(fd);
} else if (FONT_DICTIONARY_VALUE_MMTYPE.equals(subtype)) {
return new Type1FontContainer(fd);
} else if (FONT_DICTIONARY_VALUE_TYPE1.equals(subtype)) {
return new Type1FontContainer(fd);
} else if (FONT_DICTIONARY_VALUE_TYPE3.equals(subtype)) {
return new Type3FontContainer(fd);
} else if (FONT_DICTIONARY_VALUE_COMPOSITE.equals(subtype)) {
return new CompositeFontContainer(fd);
} else {
return new UndefFontContainer(fd);
}
}
private static final String subSetPattern = "^[A-Z]{6}\\+.*";
public static boolean isSubSet(String fontName) {
return fontName.matches(subSetPattern);
}
public static String getSubSetPatternDelimiter() {
return "+";
}
/*
* (non-Javadoc)
*
* @see net.awl.edoc.pdfa.validation.font.FontValidator#getState()
*/
public State getState() {
return this.fontContainer.isValid();
}
/*
* (non-Javadoc)
*
* @see net.awl.edoc.pdfa.validation.font.FontValidator#getValdiationErrors()
*/
public List<ValidationError> getValdiationErrors() {
return this.fontContainer.getErrors();
}
/**
* Type0, Type1 and TrueType FontValidatir call this method to check the
* FontFile meta data.
*
* @param fontDesc
* The FontDescriptor which contains the FontFile stream
* @param fontFile
* The font file stream to check
* @return true if the meta data is valid, false otherwise
* @throws ValidationException when checking fails
*/
protected boolean checkFontFileMetaData(PDFontDescriptor fontDesc,
PDStream fontFile) throws ValidationException {
PDMetadata metadata = fontFile.getMetadata();
if (metadata != null) {
// --- Filters are forbidden in a XMP stream
if (metadata.getFilters() != null && !metadata.getFilters().isEmpty()) {
fontContainer.addError(new ValidationError(
ValidationConstants.ERROR_SYNTAX_STREAM_INVALID_FILTER,
"Filter specified in font file metadata dictionnary"));
return false;
}
// --- extract the meta data content
byte[] mdAsBytes = null;
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
InputStream metaDataContent = metadata.createInputStream();
IOUtils.copyLarge(metaDataContent, bos);
IOUtils.closeQuietly(metaDataContent);
IOUtils.closeQuietly(bos);
mdAsBytes = bos.toByteArray();
} catch (IOException e) {
throw new ValidationException("Unable to read font metadata due to : "
+ e.getMessage(), e);
}
try {
XMPDocumentBuilder xmpBuilder = new XMPDocumentBuilder();
XMPMetadata xmpMeta = xmpBuilder.parse(mdAsBytes);
FontMetaDataValidation fontMDval = new FontMetaDataValidation();
List<ValidationError> ve = new ArrayList<ValidationError>();
boolean isVal = fontMDval.analyseFontName(xmpMeta, fontDesc, ve);
isVal = isVal && fontMDval.analyseFontName(xmpMeta, fontDesc, ve);
for (ValidationError validationError : ve) {
fontContainer.addError(validationError);
}
return isVal;
} catch (XmpUnknownValueTypeException e) {
fontContainer.addError(new ValidationError(
ValidationConstants.ERROR_METADATA_UNKNOWN_VALUETYPE, e
.getMessage()));
return false;
} catch (XmpParsingException e) {
fontContainer.addError(new ValidationError(
ValidationConstants.ERROR_METADATA_FORMAT, e.getMessage()));
return false;
} catch (XmpSchemaException e) {
fontContainer.addError(new ValidationError(
ValidationConstants.ERROR_METADATA_FORMAT, e.getMessage()));
return false;
} catch (XmpExpectedRdfAboutAttribute e) {
fontContainer.addError(new ValidationError(ValidationConstants.ERROR_METADATA_RDF_ABOUT_ATTRIBUTE_MISSING,e.getMessage()));
return false;
} catch (BadFieldValueException e) {
fontContainer.addError(new ValidationError(ValidationConstants.ERROR_METADATA_CATEGORY_PROPERTY_INVALID,e.getMessage()));
return false;
} catch (XmpXpacketEndException e) {
throw new ValidationException("Unable to parse font metadata due to : "
+ e.getMessage(), e);
}
}
// --- No MetaData, valid
return true;
}
}