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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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package org.apache.clerezza.triaxrs.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import java.nio.charset.UnsupportedCharsetException;
import java.util.List;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Providers;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ProviderUtils {
private static final Logger logger =
LoggerFactory.getLogger(ProviderUtils.class);
private static final String DEFAULT_CHARSET = "UTF-8";
private static SoftConcurrentMap<String, Boolean> validCharsets =
new SoftConcurrentMap<String, Boolean>();
private static SoftConcurrentMap<String, String> preferredCharsets =
new SoftConcurrentMap<String, String>();
public static String getCharsetOrNull(MediaType m) {
String name = (m == null) ? null : m.getParameters().get("charset"); //$NON-NLS-1$
return (name == null) ? null : name;
}
public static String getCharset(MediaType m) {
return getCharset(m, null);
}
/**
* Returns the charset on the chosen media type or, if no charset parameter
* exists on the chosen media type, the most acceptable charset based on the
* request headers.
*
* @param m the chosen media type
* @param requestHeaders the request headers to inspect
* @return the charset
*/
public static String getCharset(MediaType m, HttpHeaders requestHeaders) {
logger.debug("getCharset({}, {})", m, requestHeaders);
String name = (m == null) ? null : m.getParameters().get("charset"); //$NON-NLS-1$
if (name != null) {
logger.debug("getCharset() returning {} since parameter was set", name);
return name;
}
if (requestHeaders == null) {
logger.debug("getCharset() returning {} since requestHeaders was null", DEFAULT_CHARSET);
return DEFAULT_CHARSET;
}
List<String> acceptableCharsets =
requestHeaders.getRequestHeader(HttpHeaders.ACCEPT_CHARSET);
if (acceptableCharsets == null || acceptableCharsets.isEmpty()) {
// HTTP spec says that no Accept-Charset header indicates that any
// charset is acceptable so we'll stick with UTF-8 by default.
logger.debug("getCharset() returning {} since no Accept-Charset header",
DEFAULT_CHARSET);
return DEFAULT_CHARSET;
}
StringBuilder acceptCharsetsTemp = new StringBuilder();
acceptCharsetsTemp.append(acceptableCharsets.get(0));
for (int c = 1; c < acceptableCharsets.size(); ++c) {
acceptCharsetsTemp.append(","); //$NON-NLS-1$
acceptCharsetsTemp.append(acceptableCharsets.get(c));
}
String acceptCharsets = acceptCharsetsTemp.toString();
logger.debug("acceptCharsets combined value is {}", acceptCharsets);
String cached = preferredCharsets.get(acceptCharsets);
if (cached != null) {
return cached;
}
AcceptCharset charsets = AcceptCharset.valueOf(acceptCharsets);
if (charsets.isAnyCharsetAllowed()) {
preferredCharsets.put(acceptCharsets, DEFAULT_CHARSET);
return DEFAULT_CHARSET;
}
List<String> orderedCharsets = charsets.getAcceptableCharsets();
logger.debug("orderedCharsets is {}", orderedCharsets);
if (!orderedCharsets.isEmpty()) {
for (int c = 0; c < orderedCharsets.size(); ++c) {
String charset = orderedCharsets.get(c);
try {
Boolean b = validCharsets.get(charset);
if (b != null && b.booleanValue()) {
logger.debug("getCharset() returning {} since highest Accept-Charset value",
charset);
preferredCharsets.put(acceptCharsets, charset);
return charset;
}
Charset.forName(charset);
validCharsets.put(charset, Boolean.TRUE);
logger.debug("getCharset() returning {} since highest Accept-Charset value",
charset);
preferredCharsets.put(acceptCharsets, charset);
return charset;
} catch (IllegalCharsetNameException e) {
logger.debug("IllegalCharsetNameException for {}", charset, e);
validCharsets.put(charset, Boolean.FALSE);
} catch (UnsupportedCharsetException e) {
logger.debug("UnsupportedCharsetException for {}", charset, e);
validCharsets.put(charset, Boolean.FALSE);
} catch (IllegalArgumentException e) {
logger.debug("IllegalArgumentException for {}", charset, e);
validCharsets.put(charset, Boolean.FALSE);
}
}
}
// At this point, it's either any charset is allowed (i.e. wildcard "*"
// has a higher quality value than any other charset sent in the
// Accept-Charset header), or we only have banned charsets. If there are
// any banned charsets, then technically we should pick a non-banned
// charset.
logger.debug("getCharset() returning {} since no explicit charset required",
DEFAULT_CHARSET);
preferredCharsets.put(acceptCharsets, DEFAULT_CHARSET);
return DEFAULT_CHARSET;
}
public static Reader createReader(InputStream stream, MediaType mediaType) {
Charset charset = Charset.forName(getCharset(mediaType));
return new InputStreamReader(stream, charset);
}
public static Writer createWriter(OutputStream stream, MediaType mediaType) {
Charset charset = Charset.forName(getCharset(mediaType));
return new OutputStreamWriter(stream, charset);
}
private static ByteArrayOutputStream readFromStream(InputStream stream) throws IOException {
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
copyStream(stream, os);
return os;
}
public static byte[] readFromStreamAsBytes(InputStream stream) throws IOException {
ByteArrayOutputStream os = readFromStream(stream);
return os.toByteArray();
}
public static String readFromStreamAsString(InputStream stream, MediaType mt)
throws IOException {
ByteArrayOutputStream os = readFromStream(stream);
return os.toString(ProviderUtils.getCharset(mt));
}
public static void writeToStream(String string, OutputStream os, MediaType mt)
throws IOException {
os.write(string.getBytes(getCharset(mt)));
}
public static void copyStream(InputStream src, OutputStream dst) throws IOException {
byte[] bytes = new byte[1024];
int read = 0;
while ((read = src.read(bytes)) != -1) {
dst.write(bytes, 0, read);
}
}
public static String writeToString(Providers providers, Object object, MediaType mediaType)
throws IOException {
return writeToString(providers, object, object.getClass(), mediaType);
}
public static String writeToString(Providers providers,
Object object,
Class<?> type,
MediaType mediaType) throws IOException {
return writeToString(providers, object, type, type, mediaType);
}
public static String writeToString(Providers providers,
Object object,
Class<?> type,
Type genericType,
MediaType mediaType) throws IOException {
return writeToString(providers,
object,
type,
type,
new MultivaluedMapImpl<String, Object>(),
mediaType);
}
@SuppressWarnings("unchecked")
public static String writeToString(Providers providers,
Object object,
Class<?> type,
Type genericType,
MultivaluedMap<String, Object> httpHeaders,
MediaType mediaType) throws IOException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
MessageBodyWriter writer =
providers.getMessageBodyWriter(type, genericType, null, mediaType);
if (writer == null) {
return null;
}
writer.writeTo(object, type, genericType, new Annotation[0], mediaType, httpHeaders, os);
String contentString = os.toString(getCharset(mediaType));
return contentString;
}
public static <T> T readFromString(Providers providers,
String input,
Class<T> type,
MediaType mediaType) throws IOException {
return readFromString(providers, input, type, type, mediaType);
}
public static <T> T readFromString(Providers providers,
String input,
Class<T> type,
Type genericType,
MediaType mediaType) throws IOException {
return readFromString(providers,
input,
type,
genericType,
new MultivaluedMapImpl<String, String>(),
mediaType);
}
public static <T> T readFromString(Providers providers,
String input,
Class<T> type,
Type genericType,
MultivaluedMap<String, String> httpHeaders,
MediaType mediaType) throws IOException {
ByteArrayInputStream is = new ByteArrayInputStream(input.getBytes(getCharset(mediaType)));
MessageBodyReader<T> reader =
providers.getMessageBodyReader(type, genericType, null, mediaType);
if (reader == null) {
return null;
}
return reader.readFrom(type, genericType, new Annotation[0], mediaType, httpHeaders, is);
}
}