/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2008 Sun Microsystems, Inc.
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* Portions Copyright 2012-2015 ForgeRock AS
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*
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*/
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package org.opends.server.schema;
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import static org.opends.messages.SchemaMessages.*;
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import static org.opends.server.schema.SchemaConstants.*;
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import java.util.List;
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import org.forgerock.i18n.slf4j.LocalizedLogger;
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import org.opends.server.admin.server.ConfigurationChangeListener;
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import org.opends.server.admin.std.server.JPEGAttributeSyntaxCfg;
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import org.forgerock.opendj.ldap.schema.MatchingRule;
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import org.opends.server.api.AttributeSyntax;
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import org.forgerock.opendj.config.server.ConfigException;
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import org.opends.server.core.DirectoryServer;
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import org.forgerock.opendj.ldap.ByteSequence;
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import org.forgerock.opendj.config.server.ConfigChangeResult;
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import org.forgerock.i18n.LocalizableMessage;
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import org.forgerock.i18n.LocalizableMessageBuilder;
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/**
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* This class implements the JPEG attribute syntax. This is actually
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* two specifications - JPEG and JFIF. As an extension we allow JPEG
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* and Exif, which is what most digital cameras use. We only check for
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* valid JFIF and Exif headers.
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*/
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public class JPEGSyntax
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extends AttributeSyntax<JPEGAttributeSyntaxCfg>
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implements ConfigurationChangeListener<JPEGAttributeSyntaxCfg>
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{
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private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
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// The default equality matching rule for this syntax.
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private MatchingRule defaultEqualityMatchingRule;
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// The default ordering matching rule for this syntax.
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private MatchingRule defaultOrderingMatchingRule;
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// The default substring matching rule for this syntax.
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private MatchingRule defaultSubstringMatchingRule;
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// The current configuration for this JPEG syntax.
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private volatile JPEGAttributeSyntaxCfg config;
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/**
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* Creates a new instance of this syntax. Note that the only thing that
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* should be done here is to invoke the default constructor for the
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* superclass. All initialization should be performed in the
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* <CODE>initializeSyntax</CODE> method.
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*/
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public JPEGSyntax()
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{
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super();
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}
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/**
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* {@inheritDoc}
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*/
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public void initializeSyntax(JPEGAttributeSyntaxCfg configuration)
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throws ConfigException
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{
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defaultEqualityMatchingRule =
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DirectoryServer.getMatchingRule(EMR_OCTET_STRING_OID);
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if (defaultEqualityMatchingRule == null)
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{
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logger.error(ERR_ATTR_SYNTAX_UNKNOWN_EQUALITY_MATCHING_RULE, EMR_OCTET_STRING_OID, SYNTAX_JPEG_NAME);
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}
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defaultOrderingMatchingRule =
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DirectoryServer.getMatchingRule(OMR_OCTET_STRING_OID);
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if (defaultOrderingMatchingRule == null)
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{
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logger.error(ERR_ATTR_SYNTAX_UNKNOWN_ORDERING_MATCHING_RULE, OMR_OCTET_STRING_OID, SYNTAX_JPEG_NAME);
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}
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defaultSubstringMatchingRule =
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DirectoryServer.getMatchingRule(SMR_OCTET_STRING_OID);
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if (defaultSubstringMatchingRule == null)
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{
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logger.error(ERR_ATTR_SYNTAX_UNKNOWN_SUBSTRING_MATCHING_RULE, SMR_OCTET_STRING_OID, SYNTAX_JPEG_NAME);
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}
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this.config = configuration;
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config.addJPEGChangeListener(this);
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}
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/**
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* Retrieves the common name for this attribute syntax.
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*
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* @return The common name for this attribute syntax.
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*/
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public String getName()
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{
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return SYNTAX_JPEG_NAME;
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}
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/**
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* Retrieves the OID for this attribute syntax.
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*
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* @return The OID for this attribute syntax.
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*/
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public String getOID()
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{
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return SYNTAX_JPEG_OID;
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}
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/**
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* Retrieves a description for this attribute syntax.
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*
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* @return A description for this attribute syntax.
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*/
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public String getDescription()
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{
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return SYNTAX_JPEG_DESCRIPTION;
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}
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/**
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* Retrieves the default equality matching rule that will be used for
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* attributes with this syntax.
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*
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* @return The default equality matching rule that will be used for
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* attributes with this syntax, or <CODE>null</CODE> if equality
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* matches will not be allowed for this type by default.
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*/
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public MatchingRule getEqualityMatchingRule()
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{
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return defaultEqualityMatchingRule;
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}
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/**
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* Retrieves the default ordering matching rule that will be used for
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* attributes with this syntax.
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*
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* @return The default ordering matching rule that will be used for
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* attributes with this syntax, or <CODE>null</CODE> if ordering
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* matches will not be allowed for this type by default.
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*/
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public MatchingRule getOrderingMatchingRule()
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{
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return defaultOrderingMatchingRule;
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}
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/**
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* Retrieves the default substring matching rule that will be used for
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* attributes with this syntax.
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*
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* @return The default substring matching rule that will be used for
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* attributes with this syntax, or <CODE>null</CODE> if substring
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* matches will not be allowed for this type by default.
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*/
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public MatchingRule getSubstringMatchingRule()
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{
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return defaultSubstringMatchingRule;
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}
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/**
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* Retrieves the default approximate matching rule that will be used for
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* attributes with this syntax.
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*
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* @return The default approximate matching rule that will be used for
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* attributes with this syntax, or <CODE>null</CODE> if approximate
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* matches will not be allowed for this type by default.
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*/
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public MatchingRule getApproximateMatchingRule()
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{
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// There is no approximate matching rule by default.
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return null;
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}
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/**
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* Indicates whether the provided value is acceptable for use in an attribute
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* with this syntax. If it is not, then the reason may be appended to the
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* provided buffer.
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*
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* @param value The value for which to make the determination.
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* @param invalidReason The buffer to which the invalid reason should be
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* appended.
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*
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* @return <CODE>true</CODE> if the provided value is acceptable for use with
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* this syntax, or <CODE>false</CODE> if not.
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*/
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public boolean valueIsAcceptable(ByteSequence value,
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LocalizableMessageBuilder invalidReason)
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{
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// anything is acceptable if we're not strict.
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if (!config.isStrictFormat())
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return true;
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/* JFIF files start:
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* 0xff 0xd8 0xff 0xe0 LH LL 0x4a 0x46 0x49 0x46 ...
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* SOI APP0 len "JFIF"
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*
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* Exif files (from most digital cameras) start:
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* 0xff 0xd8 0xff 0xe1 LH LL 0x45 0x78 0x69 0x66 ...
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* SOI APP1 len "Exif"
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*
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* So all legal values must be at least 10 bytes long
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*/
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if (value.length() < 10)
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return false;
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if (value.byteAt(0) != (byte)0xff && value.byteAt(1) != (byte)0xd8)
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return false;
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if (value.byteAt(2) == (byte)0xff && value.byteAt(3) == (byte)0xe0 &&
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value.byteAt(6) == 'J' && value.byteAt(7) == 'F' &&
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value.byteAt(8) == 'I' && value.byteAt(9) == 'F')
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return true;
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if (value.byteAt(2) == (byte)0xff && value.byteAt(3) == (byte)0xe1 &&
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value.byteAt(6) == 'E' && value.byteAt(7) == 'x' &&
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value.byteAt(8) == 'i' && value.byteAt(9) == 'f')
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return true;
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// No JFIF or Exif header found
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isConfigurationChangeAcceptable(
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JPEGAttributeSyntaxCfg configuration,
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List<LocalizableMessage> unacceptableReasons)
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{
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// The configuration will always be acceptable.
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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public ConfigChangeResult applyConfigurationChange(
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JPEGAttributeSyntaxCfg configuration)
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{
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this.config = configuration;
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return new ConfigChangeResult();
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isBEREncodingRequired()
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{
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isHumanReadable()
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{
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return false;
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}
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}
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