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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.http.server.jetty;
import org.eclipse.jetty.util.ByteArrayISO8859Writer;
import org.eclipse.jetty.util.StringUtil;
import java.io.IOException;
import java.util.Optional;
/**
* Creates HTML body having the status code, error message and request uri.
* The body is constructed from a template that is inspired by the default Jetty template (see {@link org.eclipse.jetty.server.Response#sendError(int, String)}).
* The content is written using the ISO-8859-1 charset.
*
* @author bjorncs
*/
public class ErrorResponseContentCreator {
private final ByteArrayISO8859Writer writer = new ByteArrayISO8859Writer(2048);
public byte[] createErrorContent(String requestUri, int statusCode, Optional<String> message) {
String sanitizedString = message.map(StringUtil::sanitizeXmlString).orElse("");
String statusCodeString = Integer.toString(statusCode);
writer.resetWriter();
try {
writer.write("<html>\n<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html;charset=ISO-8859-1\"/>\n<title>Error ");
writer.write(statusCodeString);
writer.write("</title>\n</head>\n<body>\n<h2>HTTP ERROR: ");
writer.write(statusCodeString);
writer.write("</h2>\n<p>Problem accessing ");
writer.write(StringUtil.sanitizeXmlString(requestUri));
writer.write(". Reason:\n<pre> ");
writer.write(sanitizedString);
writer.write("</pre></p>\n<hr/>\n</body>\n</html>\n");
} catch (IOException e) {
// IOException should not be thrown unless writer is constructed using byte[] parameter
throw new RuntimeException(e);
}
return writer.getByteArray();
}
}
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