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org.jboss.resteasy.core.request.AcceptHeaders Maven / Gradle / Ivy
package org.jboss.resteasy.core.request;
import org.jboss.resteasy.logging.Logger;
import org.jboss.resteasy.spi.BadRequestException;
import javax.ws.rs.core.MediaType;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
/**
* @author Pascal S. de Kloe
*/
public class AcceptHeaders
{
private static final Logger logger = Logger.getLogger(AcceptHeaders.class);
/**
* Gets the strings from a comma-separated list.
* All "*" entries are replaced with {@code null} keys.
*
* @param header the header value.
* @return the listed items in order of appearance or {@code null} if the header didn't contain any entries.
*/
public static Map getStringQualityValues(String header)
{
if (header == null)
return null;
header = header.trim();
if (header.length() == 0)
return null;
Map result = new LinkedHashMap();
int offset = 0;
while (true)
{
int endIndex = header.indexOf(',', offset);
String content;
if (endIndex < 0)
content = header.substring(offset);
else
content = header.substring(offset, endIndex);
QualityValue qualityValue = QualityValue.DEFAULT;
int qualityIndex = content.indexOf(';');
if (qualityIndex >= 0)
{
String parameter = content.substring(qualityIndex + 1);
content = content.substring(0, qualityIndex);
int equalsIndex = parameter.indexOf('=');
if (equalsIndex < 0)
throw new BadRequestException("Malformed parameter: " + parameter);
String name = parameter.substring(0, equalsIndex).trim();
if (!"q".equals(name))
throw new BadRequestException("Unsupported parameter: " + name);
String value = parameter.substring(equalsIndex + 1).trim();
qualityValue = QualityValue.valueOf(value);
}
content = content.trim();
if (content.length() == 0)
throw new BadRequestException("Empty field in: " + header + ".");
if (content.equals("*"))
result.put(null, qualityValue);
else
result.put(content, qualityValue);
if (endIndex < 0)
break;
offset = endIndex + 1;
}
;
if (logger.isDebugEnabled())
logger.debug(result.toString());
return result;
}
/**
* Gets the locales from a comma-separated list.
* Any "*" entries are replaced with {@code null} keys.
*
* @param header the header value.
* @return the listed items in order of appearance or {@code null} if the header didn't contain any entries.
*/
public static Map getLocaleQualityValues(String header)
{
Map stringResult = getStringQualityValues(header);
if (stringResult == null)
return null;
Map result = new LinkedHashMap(stringResult.size() * 2);
for (Entry entry : stringResult.entrySet())
{
QualityValue quality = entry.getValue();
Locale locale = null;
String value = entry.getKey();
if (value != null)
{
int length = value.length();
if (length == 2)
{
locale = new Locale(value);
}
else if (length == 5 && value.charAt(2) == '-')
{
String language = value.substring(0, 2);
String country = value.substring(3, 5);
locale = new Locale(language, country);
}
else
{
logger.warn("Ignoring unsupported locale: " + value);
continue;
}
}
result.put(locale, quality);
}
if (logger.isDebugEnabled())
logger.debug(result.toString());
return result;
}
/**
* Gets the media types from a comma-separated list.
*
* @param header the header value.
* @return the listed items in order of appearance or {@code null} if the header didn't contain any entries.
*/
public static Map getMediaTypeQualityValues(String header)
{
if (header == null)
return null;
header = header.trim();
if (header.length() == 0)
return null;
Map result = new LinkedHashMap();
int offset = 0;
while (offset >= 0)
{
int slashIndex = header.indexOf('/', offset);
if (slashIndex < 0)
throw new BadRequestException("Malformed media type: " + header);
String type = header.substring(offset, slashIndex);
String subtype;
Map parameters = null;
QualityValue qualityValue = QualityValue.DEFAULT;
offset = slashIndex + 1;
int parameterStartIndex = header.indexOf(';', offset);
int itemEndIndex = header.indexOf(',', offset);
if (parameterStartIndex == itemEndIndex)
{
assert itemEndIndex == -1;
subtype = header.substring(offset);
offset = -1;
}
else if (itemEndIndex < 0 || (parameterStartIndex >= 0 && parameterStartIndex < itemEndIndex))
{
subtype = header.substring(offset, parameterStartIndex);
offset = parameterStartIndex + 1;
parameters = new LinkedHashMap();
offset = parseParameters(parameters, header, offset);
qualityValue = evaluateAcceptParameters(parameters);
}
else
{
subtype = header.substring(offset, itemEndIndex);
offset = itemEndIndex + 1;
}
result.put(new MediaType(type.trim(), subtype.trim(), parameters), qualityValue);
}
if (logger.isDebugEnabled())
logger.debug(result.toString());
return result;
}
private static int parseParameters(Map parameters, String header, int offset)
{
while (true)
{
int equalsIndex = header.indexOf('=', offset);
if (equalsIndex < 0)
throw new BadRequestException("Malformed parameters: " + header);
String name = header.substring(offset, equalsIndex).trim();
offset = equalsIndex + 1;
if (header.charAt(offset) == '"')
{
int end = offset;
++offset;
do
{
end = header.indexOf('"', ++end);
if (end < 0)
throw new BadRequestException("Quoted string is not closed: " + header);
} while (header.charAt(end - 1) == '\\');
String value = header.substring(offset, end);
parameters.put(name, value);
offset = end + 1;
int parameterEndIndex = header.indexOf(';', offset);
int itemEndIndex = header.indexOf(',', offset);
if (parameterEndIndex == itemEndIndex)
{
assert itemEndIndex == -1;
if (header.substring(offset).trim().length() != 0)
throw new BadRequestException("Tailing garbage: " + header);
return -1;
}
else if (parameterEndIndex < 0 || (itemEndIndex >= 0 && itemEndIndex < parameterEndIndex))
{
if (header.substring(offset, itemEndIndex).trim().length() != 0)
throw new BadRequestException("Garbage after quoted string: " + header);
return itemEndIndex + 1;
}
else
{
if (header.substring(offset, parameterEndIndex).trim().length() != 0)
throw new BadRequestException("Garbage after quoted string: " + header);
offset = parameterEndIndex + 1;
}
}
else
{
int parameterEndIndex = header.indexOf(';', offset);
int itemEndIndex = header.indexOf(',', offset);
if (parameterEndIndex == itemEndIndex)
{
assert itemEndIndex == -1;
String value = header.substring(offset).trim();
parameters.put(name, value);
return -1;
}
else if (parameterEndIndex < 0 || (itemEndIndex >= 0 && itemEndIndex < parameterEndIndex))
{
String value = header.substring(offset, itemEndIndex).trim();
parameters.put(name, value);
return itemEndIndex + 1;
}
else
{
String value = header.substring(offset, parameterEndIndex).trim();
parameters.put(name, value);
offset = parameterEndIndex + 1;
}
}
}
}
/**
* Evaluates and removes the accept parameters.
*
* accept-params = ";" "q" "=" qvalue *( accept-extension )
* accept-extension = ";" token [ "=" ( token | quoted-string ) ]
*
*
* @param parameters all parameters in order of appearance.
* @return the qvalue.
* @see "accept-params
*/
private static QualityValue evaluateAcceptParameters(Map parameters)
{
Iterator i = parameters.keySet().iterator();
while (i.hasNext())
{
String name = i.next();
if ("q".equals(name))
{
if (i.hasNext())
{
logger.warn("Accept extensions not supported.");
i.remove();
do
{
i.next();
i.remove();
} while (i.hasNext());
return QualityValue.NOT_ACCEPTABLE;
}
else
{
String value = parameters.get(name);
i.remove();
return QualityValue.valueOf(value);
}
}
}
return QualityValue.DEFAULT;
}
}
