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package org.apache.pdfbox.preflight.font.descriptor;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_FONTS_DESCRIPTOR_INVALID;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_FONTS_FONT_FILEX_INVALID;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_METADATA_FORMAT;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_METADATA_FORMAT_STREAM;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_METADATA_FORMAT_UNKNOWN;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_METADATA_FORMAT_XPACKET;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_METADATA_UNKNOWN_VALUETYPE;
import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_SYNTAX_STREAM_INVALID_FILTER;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.io.IOUtils;
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.PDFontLike;
import org.apache.pdfbox.preflight.PreflightContext;
import org.apache.pdfbox.preflight.ValidationResult.ValidationError;
import org.apache.pdfbox.preflight.font.container.FontContainer;
import org.apache.pdfbox.preflight.font.util.FontMetaDataValidation;
import org.apache.xmpbox.XMPMetadata;
import org.apache.xmpbox.xml.DomXmpParser;
import org.apache.xmpbox.xml.XmpParsingException;
import org.apache.xmpbox.xml.XmpParsingException.ErrorType;
public abstract class FontDescriptorHelper
{
protected T fContainer;
protected PreflightContext context;
protected PDFontLike font;
protected PDFontDescriptor fontDescriptor;
private static final Set MANDATORYFIELDS;
static
{
MANDATORYFIELDS = new HashSet<>();
MANDATORYFIELDS.add(COSName.FLAGS.getName());
MANDATORYFIELDS.add(COSName.ITALIC_ANGLE.getName());
MANDATORYFIELDS.add(COSName.CAP_HEIGHT.getName());
MANDATORYFIELDS.add(COSName.FONT_BBOX.getName());
MANDATORYFIELDS.add(COSName.ASCENT.getName());
MANDATORYFIELDS.add(COSName.DESCENT.getName());
MANDATORYFIELDS.add(COSName.STEM_V.getName());
MANDATORYFIELDS.add(COSName.FONT_NAME.getName());
MANDATORYFIELDS.add(COSName.TYPE.getName());
}
public FontDescriptorHelper(PreflightContext context, PDFontLike font, T fontContainer)
{
super();
this.fContainer = fontContainer;
this.context = context;
this.font = font;
}
public void validate()
{
PDFontDescriptor fd = this.font.getFontDescriptor();
boolean isStandard14 = false;
if (this.font instanceof PDFont)
{
isStandard14 = ((PDFont) font).isStandard14();
}
// Only a PDFontDescriptorDictionary provides a way to embedded the font program.
if (fd != null)
{
fontDescriptor = fd;
if (!isStandard14)
{
checkMandatoryFields(fontDescriptor.getCOSObject());
}
if (hasOnlyOneFontFile(fontDescriptor))
{
PDStream fontFile = extractFontFile(fontDescriptor);
if (fontFile != null)
{
processFontFile(fontDescriptor, fontFile);
checkFontFileMetaData(fontDescriptor, fontFile);
}
}
else
{
if (fontFileNotEmbedded(fontDescriptor))
{
this.fContainer.push(new ValidationError(ERROR_FONTS_FONT_FILEX_INVALID,
fontDescriptor.getFontName() + ": FontFile entry is missing from FontDescriptor"));
this.fContainer.notEmbedded();
}
else
{
this.fContainer.push(new ValidationError(ERROR_FONTS_FONT_FILEX_INVALID,
fontDescriptor.getFontName() + ": They is more than one FontFile"));
}
}
}
else
{
this.fContainer.push(new ValidationError(ERROR_FONTS_DESCRIPTOR_INVALID,
this.font.getName() + ": FontDescriptor is null or is an AFM Descriptor"));
this.fContainer.notEmbedded();
}
}
protected boolean checkMandatoryFields(COSDictionary fDescriptor)
{
boolean result = true;
StringBuilder missingFields = new StringBuilder();
for (String field : MANDATORYFIELDS)
{
if (!fDescriptor.containsKey(field))
{
if (missingFields.length() > 1)
{
missingFields.append(", ");
}
missingFields.append(field);
}
}
if (fDescriptor.containsKey(COSName.TYPE))
{
COSBase type = fDescriptor.getItem(COSName.TYPE);
if (!COSName.FONT_DESC.equals(type))
{
this.fContainer.push(new ValidationError(ERROR_FONTS_DESCRIPTOR_INVALID,
this.font.getName()
+ ": /Type in FontDescriptor must be /FontDescriptor, but is " + type));
result = false;
}
}
if (missingFields.length() > 0)
{
this.fContainer.push(new ValidationError(ERROR_FONTS_DESCRIPTOR_INVALID,
this.font.getName()
+ ": some mandatory fields are missing from the FontDescriptor: " + missingFields + "."));
result = false;
}
return result;
}
public abstract PDStream extractFontFile(PDFontDescriptor fontDescriptor);
/**
* Return true if the FontDescriptor has only one FontFile entry.
*
* @param fontDescriptor
* @return true if the FontDescriptor has only one FontFile entry.
*/
protected boolean hasOnlyOneFontFile(PDFontDescriptor fontDescriptor)
{
PDStream ff1 = fontDescriptor.getFontFile();
PDStream ff2 = fontDescriptor.getFontFile2();
PDStream ff3 = fontDescriptor.getFontFile3();
return (ff1 != null ^ ff2 != null ^ ff3 != null);
}
protected boolean fontFileNotEmbedded(PDFontDescriptor fontDescriptor)
{
PDStream ff1 = fontDescriptor.getFontFile();
PDStream ff2 = fontDescriptor.getFontFile2();
PDStream ff3 = fontDescriptor.getFontFile3();
return (ff1 == null && ff2 == null && ff3 == null);
}
protected abstract void processFontFile(PDFontDescriptor fontDescriptor, PDStream fontFile);
/**
* Type0, Type1 and TrueType FontValidator call this method to check the FontFile meta data.
*
* @param fontDescriptor
* The FontDescriptor which contains the FontFile stream
* @param fontFile
* The font file stream to check
*/
protected void checkFontFileMetaData(PDFontDescriptor fontDescriptor, PDStream fontFile)
{
try
{
PDMetadata metadata = fontFile.getMetadata();
if (metadata != null)
{
// Filters are forbidden in a XMP stream
if (!metadata.getFilters().isEmpty())
{
this.fContainer.push(new ValidationError(ERROR_SYNTAX_STREAM_INVALID_FILTER,
this.font.getName() + ": Filter specified in font file metadata dictionary"));
return;
}
byte[] mdAsBytes = getMetaDataStreamAsBytes(metadata);
try
{
DomXmpParser xmpBuilder = new DomXmpParser();
XMPMetadata xmpMeta = xmpBuilder.parse(mdAsBytes);
FontMetaDataValidation fontMDval = new FontMetaDataValidation();
List ve = new ArrayList<>();
fontMDval.analyseFontName(xmpMeta, fontDescriptor, ve);
fontMDval.analyseRights(xmpMeta, fontDescriptor, ve);
this.fContainer.push(ve);
}
catch (XmpParsingException e)
{
if (e.getErrorType() == ErrorType.NoValueType)
{
this.fContainer.push(new ValidationError(ERROR_METADATA_UNKNOWN_VALUETYPE, e.getMessage(), e));
}
else if (e.getErrorType() == ErrorType.XpacketBadEnd)
{
this.fContainer.push(new ValidationError(ERROR_METADATA_FORMAT_XPACKET,
this.font.getName() + ": Unable to parse font metadata due to : " + e.getMessage(), e));
}
else
{
this.fContainer.push(new ValidationError(ERROR_METADATA_FORMAT, e.getMessage(), e));
}
}
}
}
catch (IllegalStateException e)
{
this.fContainer.push(new ValidationError(ERROR_METADATA_FORMAT_UNKNOWN,
this.font.getName() + ": The Metadata entry doesn't reference a stream object", e));
}
}
protected final byte[] getMetaDataStreamAsBytes(PDMetadata metadata)
{
try (InputStream metaDataContent = metadata.createInputStream())
{
return IOUtils.toByteArray(metaDataContent);
}
catch (IOException e)
{
this.fContainer.push(new ValidationError(ERROR_METADATA_FORMAT_STREAM,
this.font.getName() + ": Unable to read font metadata due to : " + e.getMessage(), e));
return null;
}
}
public static boolean isSubSet(String fontName)
{
return fontName != null && fontName.matches("^[A-Z]{6}\\+.*");
}
}
