--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/luan/modules/url/WwwAuthenticate.java	Fri Feb 01 03:46:56 2019 -0700
@@ -0,0 +1,56 @@
+package luan.modules.url;
+
+import java.util.Map;
+import java.util.HashMap;
+import luan.lib.parser.Parser;
+import luan.lib.parser.ParseException;
+
+
+public final class WwwAuthenticate {
+	public final String type;
+	public final Map<String,String> options = new HashMap<String,String>();
+	private final Parser parser;
+
+	public WwwAuthenticate(String header) throws ParseException {
+		parser = new Parser(header);
+		type = parseType();
+		if( !matchSpace() )
+			throw new ParseException(parser,"space expected");
+		do {
+			while( matchSpace() );
+			int start = parser.currentIndex();
+			while( parser.inCharRange('a','z') );
+			String name = parser.textFrom(start);
+			if( name.length() == 0 )
+				throw new ParseException(parser,"option name not found");
+			if( !parser.match('=') )
+				throw new ParseException(parser,"'=' expected");
+			if( !parser.match('"') )
+				throw new ParseException(parser,"'\"' expected");
+			start = parser.currentIndex();
+			while( !parser.test('"') ) {
+				if( !parser.anyChar() )
+					throw new ParseException(parser,"unexpected end of text");
+			}
+			String value = parser.textFrom(start);
+			if( !parser.match('"') )
+				throw new ParseException(parser,"'\"' expected");
+			options.put(name,value);
+			while( matchSpace() );
+		} while( parser.match(',') );
+		if( !parser.endOfInput() )
+			throw new ParseException(parser,"unexpected input");
+	}
+
+	private String parseType() throws ParseException {
+		if( parser.match("Basic") )
+			return "Basic";
+		if( parser.match("Digest") )
+			return "Digest";
+		throw new ParseException(parser,"invalid type");
+	}
+
+	private boolean matchSpace() {
+		return parser.anyOf(" \t\r\n");
+	}
+}
\ No newline at end of file