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package org.pdfbox.pdmodel.encryption;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSInteger;
import org.pdfbox.cos.COSName;
import org.pdfbox.cos.COSNumber;
import org.pdfbox.cos.COSString;
import java.io.IOException;
/**
* This class holds information that is related to the standard PDF encryption.
*
* See PDF Reference 1.4 section "3.5 Encryption"
*
* @author Ben Litchfield (ben@csh.rit.edu)
* @version $Revision: 1.5 $
*/
public class PDStandardEncryption extends PDEncryptionDictionary
{
/**
* The 'Filter' name for this security handler.
*/
public static final String FILTER_NAME = "Standard";
/**
* The default revision of one is not specified.
*/
public static final int DEFAULT_REVISION = 3;
/**
* Encryption revision 2.
*/
public static final int REVISION2 = 2;
/**
* Encryption revision 3.
*/
public static final int REVISION3 = 3;
/**
* Encryption revision 4.
*/
public static final int REVISION4 = 4;
/**
* The default set of permissions which is to allow all.
*/
public static final int DEFAULT_PERMISSIONS = 0xFFFFFFFF ^ 3;//bits 0 & 1 need to be zero
private static final int PRINT_BIT = 3;
private static final int MODIFICATION_BIT = 4;
private static final int EXTRACT_BIT = 5;
private static final int MODIFY_ANNOTATIONS_BIT = 6;
private static final int FILL_IN_FORM_BIT = 9;
private static final int EXTRACT_FOR_ACCESSIBILITY_BIT = 10;
private static final int ASSEMBLE_DOCUMENT_BIT = 11;
private static final int DEGRADED_PRINT_BIT = 12;
/**
* Default constructor that uses Version 2, Revision 3, 40 bit encryption,
* all permissions allowed.
*/
public PDStandardEncryption()
{
super();
encryptionDictionary.setItem( COSName.FILTER, COSName.getPDFName( FILTER_NAME ) );
setVersion( PDEncryptionDictionary.VERSION1_40_BIT_ALGORITHM );
setRevision( PDStandardEncryption.REVISION2 );
setPermissions( DEFAULT_PERMISSIONS );
}
/**
* Constructor from existing dictionary.
*
* @param dict The existing encryption dictionary.
*/
public PDStandardEncryption( COSDictionary dict )
{
super( dict );
}
/**
* This will return the R entry of the encryption dictionary.<br /><br />
* See PDF Reference 1.4 Table 3.14.
*
* @return The encryption revision to use.
*/
public int getRevision()
{
int revision = DEFAULT_VERSION;
COSNumber cosRevision = (COSNumber)encryptionDictionary.getDictionaryObject( COSName.getPDFName( "R" ) );
if( cosRevision != null )
{
revision = cosRevision.intValue();
}
return revision;
}
/**
* This will set the R entry of the encryption dictionary.<br /><br />
* See PDF Reference 1.4 Table 3.14. <br /><br/>
*
* <b>Note: This value is used to decrypt the pdf document. If you change this when
* the document is encrypted then decryption will fail!.</b>
*
* @param revision The new encryption version.
*/
public void setRevision( int revision )
{
encryptionDictionary.setItem( COSName.getPDFName( "R" ), new COSInteger( revision ) );
}
/**
* This will get the O entry in the standard encryption dictionary.
*
* @return A 32 byte array or null if there is no owner key.
*/
public byte[] getOwnerKey()
{
byte[] o = null;
COSString owner = (COSString)encryptionDictionary.getDictionaryObject( COSName.getPDFName( "O" ) );
if( owner != null )
{
o = owner.getBytes();
}
return o;
}
/**
* This will set the O entry in the standard encryption dictionary.
*
* @param o A 32 byte array or null if there is no owner key.
*
* @throws IOException If there is an error setting the data.
*/
public void setOwnerKey( byte[] o ) throws IOException
{
COSString owner = new COSString();
owner.append( o );
encryptionDictionary.setItem( COSName.getPDFName( "O" ), owner );
}
/**
* This will get the U entry in the standard encryption dictionary.
*
* @return A 32 byte array or null if there is no user key.
*/
public byte[] getUserKey()
{
byte[] u = null;
COSString user = (COSString)encryptionDictionary.getDictionaryObject( COSName.getPDFName( "U" ) );
if( user != null )
{
u = user.getBytes();
}
return u;
}
/**
* This will set the U entry in the standard encryption dictionary.
*
* @param u A 32 byte array.
*
* @throws IOException If there is an error setting the data.
*/
public void setUserKey( byte[] u ) throws IOException
{
COSString user = new COSString();
user.append( u );
encryptionDictionary.setItem( COSName.getPDFName( "U" ), user );
}
/**
* This will get the permissions bit mask.
*
* @return The permissions bit mask.
*/
public int getPermissions()
{
int permissions = 0;
COSInteger p = (COSInteger)encryptionDictionary.getDictionaryObject( COSName.getPDFName( "P" ) );
if( p != null )
{
permissions = p.intValue();
}
return permissions;
}
/**
* This will set the permissions bit mask.
*
* @param p The new permissions bit mask
*/
public void setPermissions( int p )
{
encryptionDictionary.setItem( COSName.getPDFName( "P" ), new COSInteger( p ) );
}
private boolean isPermissionBitOn( int bit )
{
return (getPermissions() & (1 << (bit-1))) != 0;
}
private boolean setPermissionBit( int bit, boolean value )
{
int permissions = getPermissions();
if( value )
{
permissions = permissions | (1 << (bit-1));
}
else
{
permissions = permissions & (0xFFFFFFFF ^ (1 << (bit-1)));
}
setPermissions( permissions );
return (getPermissions() & (1 << (bit-1))) != 0;
}
/**
* This will tell if the user can print.
*
* @return true If supplied with the user password they are allowed to print.
*/
public boolean canPrint()
{
return isPermissionBitOn( PRINT_BIT );
}
/**
* Set if the user can print.
*
* @param allowPrinting A boolean determining if the user can print.
*/
public void setCanPrint( boolean allowPrinting )
{
setPermissionBit( PRINT_BIT, allowPrinting );
}
/**
* This will tell if the user can modify contents of the document.
*
* @return true If supplied with the user password they are allowed to modify the document
*/
public boolean canModify()
{
return isPermissionBitOn( MODIFICATION_BIT );
}
/**
* Set if the user can modify the document.
*
* @param allowModifications A boolean determining if the user can modify the document.
*/
public void setCanModify( boolean allowModifications )
{
setPermissionBit( MODIFICATION_BIT, allowModifications );
}
/**
* This will tell if the user can extract text and images from the PDF document.
*
* @return true If supplied with the user password they are allowed to extract content
* from the PDF document
*/
public boolean canExtractContent()
{
return isPermissionBitOn( EXTRACT_BIT );
}
/**
* Set if the user can extract content from the document.
*
* @param allowExtraction A boolean determining if the user can extract content
* from the document.
*/
public void setCanExtractContent( boolean allowExtraction )
{
setPermissionBit( EXTRACT_BIT, allowExtraction );
}
/**
* This will tell if the user can add/modify text annotations, fill in interactive forms fields.
*
* @return true If supplied with the user password they are allowed to modify annotations.
*/
public boolean canModifyAnnotations()
{
return isPermissionBitOn( MODIFY_ANNOTATIONS_BIT );
}
/**
* Set if the user can modify annotations.
*
* @param allowAnnotationModification A boolean determining if the user can modify annotations.
*/
public void setCanModifyAnnotations( boolean allowAnnotationModification )
{
setPermissionBit( MODIFY_ANNOTATIONS_BIT, allowAnnotationModification );
}
/**
* This will tell if the user can fill in interactive forms.
*
* @return true If supplied with the user password they are allowed to fill in form fields.
*/
public boolean canFillInForm()
{
return isPermissionBitOn( FILL_IN_FORM_BIT );
}
/**
* Set if the user can fill in interactive forms.
*
* @param allowFillingInForm A boolean determining if the user can fill in interactive forms.
*/
public void setCanFillInForm( boolean allowFillingInForm )
{
setPermissionBit( FILL_IN_FORM_BIT, allowFillingInForm );
}
/**
* This will tell if the user can extract text and images from the PDF document
* for accessibility purposes.
*
* @return true If supplied with the user password they are allowed to extract content
* from the PDF document
*/
public boolean canExtractForAccessibility()
{
return isPermissionBitOn( EXTRACT_FOR_ACCESSIBILITY_BIT );
}
/**
* Set if the user can extract content from the document for accessibility purposes.
*
* @param allowExtraction A boolean determining if the user can extract content
* from the document.
*/
public void setCanExtractForAccessibility( boolean allowExtraction )
{
setPermissionBit( EXTRACT_FOR_ACCESSIBILITY_BIT, allowExtraction );
}
/**
* This will tell if the user can insert/rotate/delete pages.
*
* @return true If supplied with the user password they are allowed to extract content
* from the PDF document
*/
public boolean canAssembleDocument()
{
return isPermissionBitOn( ASSEMBLE_DOCUMENT_BIT );
}
/**
* Set if the user can insert/rotate/delete pages.
*
* @param allowAssembly A boolean determining if the user can assemble the document.
*/
public void setCanAssembleDocument( boolean allowAssembly )
{
setPermissionBit( ASSEMBLE_DOCUMENT_BIT, allowAssembly );
}
/**
* This will tell if the user can print the document in a degraded format.
*
* @return true If supplied with the user password they are allowed to print the
* document in a degraded format.
*/
public boolean canPrintDegraded()
{
return isPermissionBitOn( DEGRADED_PRINT_BIT );
}
/**
* Set if the user can print the document in a degraded format.
*
* @param allowAssembly A boolean determining if the user can print the
* document in a degraded format.
*/
public void setCanPrintDegraded( boolean allowAssembly )
{
setPermissionBit( DEGRADED_PRINT_BIT, allowAssembly );
}
}