com.foreach.imageserver.client.Md5ImageRequestHashBuilder Maven / Gradle / Ivy
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package com.foreach.imageserver.client;
import com.foreach.imageserver.dto.ImageResolutionDto;
import com.foreach.imageserver.dto.ImageVariantDto;
import lombok.NonNull;
import org.apache.commons.lang3.StringUtils;
import org.springframework.util.DigestUtils;
/**
* Default implementation of {@link ImageRequestHashBuilder} that calculates a uses an MD5
* hash of all parameters including an additional custom hash token.
*
* @author Arne Vandamme
*/
public class Md5ImageRequestHashBuilder implements ImageRequestHashBuilder
{
private final String hashToken;
/**
* Create a new builder instance for creating MD5 hashes of all paremeters including an
* additional specified token. If the server uses the same token it should be able to
* verify the generated hash codes.
*
* @param hashToken that will be added to the parameters when building the hash
*/
public Md5ImageRequestHashBuilder( @NonNull String hashToken ) {
this.hashToken = hashToken;
}
@Override
public String calculateHash( String context,
String ratio,
ImageResolutionDto imageResolution,
ImageVariantDto imageVariant,
String... size ) {
StringBuilder buffer = new StringBuilder( hashToken )
.append( context )
.append( StringUtils.defaultString( ratio ) )
.append( StringUtils.join( size ) );
if ( imageResolution != null ) {
buffer.append( "res" ).append( imageResolution.getWidth() ).append( imageResolution.getHeight() );
}
else {
buffer.append( "res" );
}
if ( imageVariant != null ) {
buffer.append( "var" );
if ( imageVariant.getImageType() != null ) {
buffer.append( imageVariant.getImageType() );
}
if ( imageVariant.getBoundaries() != null ) {
buffer.append( imageVariant.getBoundaries().getWidth() ).
append( imageVariant.getBoundaries().getHeight() );
}
}
else {
buffer.append( "var" );
}
return DigestUtils.md5DigestAsHex( buffer.toString().getBytes() );
}
}