| /* |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * 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 |
| * under the License. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.hc.client5.http.impl.auth; |
| |
| import java.util.ArrayList; |
| import java.util.BitSet; |
| import java.util.List; |
| |
| import org.apache.hc.client5.http.auth.AuthChallenge; |
| import org.apache.hc.client5.http.auth.ChallengeType; |
| import org.apache.hc.core5.http.NameValuePair; |
| import org.apache.hc.core5.http.ParseException; |
| import org.apache.hc.core5.http.message.BasicNameValuePair; |
| import org.apache.hc.core5.http.message.ParserCursor; |
| import org.apache.hc.core5.http.message.TokenParser; |
| |
| public class AuthChallengeParser { |
| |
| public static final AuthChallengeParser INSTANCE = new AuthChallengeParser(); |
| |
| private final TokenParser tokenParser = TokenParser.INSTANCE; |
| |
| private final static char BLANK = ' '; |
| private final static char COMMA_CHAR = ','; |
| private final static char EQUAL_CHAR = '='; |
| |
| // IMPORTANT! |
| // These private static variables must be treated as immutable and never exposed outside this class |
| private static final BitSet TERMINATORS = TokenParser.INIT_BITSET(BLANK, EQUAL_CHAR, COMMA_CHAR); |
| private static final BitSet DELIMITER = TokenParser.INIT_BITSET(COMMA_CHAR); |
| |
| NameValuePair parseTokenOrParameter(final CharSequence buffer, final ParserCursor cursor) { |
| |
| tokenParser.skipWhiteSpace(buffer, cursor); |
| final String token = tokenParser.parseToken(buffer, cursor, TERMINATORS); |
| if (!cursor.atEnd()) { |
| if (buffer.charAt(cursor.getPos()) == BLANK) { |
| tokenParser.skipWhiteSpace(buffer, cursor); |
| } |
| if (!cursor.atEnd() && buffer.charAt(cursor.getPos()) == EQUAL_CHAR) { |
| cursor.updatePos(cursor.getPos() + 1); |
| final String value = tokenParser.parseValue(buffer, cursor, DELIMITER); |
| return new BasicNameValuePair(token, value); |
| } |
| } |
| return new BasicNameValuePair(token, null); |
| } |
| |
| public List<AuthChallenge> parse(final ChallengeType challengeType, final CharSequence buffer, final ParserCursor cursor) throws ParseException { |
| |
| final List<AuthChallenge> list = new ArrayList<>(); |
| String scheme = null; |
| final List<NameValuePair> params = new ArrayList<>(); |
| while (!cursor.atEnd()) { |
| final NameValuePair tokenOrParameter = parseTokenOrParameter(buffer, cursor); |
| if (tokenOrParameter.getValue() == null && !cursor.atEnd() && buffer.charAt(cursor.getPos()) != COMMA_CHAR) { |
| if (scheme != null) { |
| if (params.isEmpty()) { |
| throw new ParseException("Malformed auth challenge"); |
| } |
| list.add(createAuthChallenge(challengeType, scheme, params)); |
| params.clear(); |
| } |
| scheme = tokenOrParameter.getName(); |
| } else { |
| params.add(tokenOrParameter); |
| if (!cursor.atEnd() && buffer.charAt(cursor.getPos()) != COMMA_CHAR) { |
| scheme = null; |
| } |
| } |
| if (!cursor.atEnd() && buffer.charAt(cursor.getPos()) == COMMA_CHAR) { |
| cursor.updatePos(cursor.getPos() + 1); |
| } |
| } |
| list.add(createAuthChallenge(challengeType, scheme, params)); |
| return list; |
| } |
| |
| private static AuthChallenge createAuthChallenge(final ChallengeType challengeType, final String scheme, final List<NameValuePair> params) throws ParseException { |
| if (scheme != null) { |
| if (params.size() == 1) { |
| final NameValuePair nvp = params.get(0); |
| if (nvp.getValue() == null) { |
| return new AuthChallenge(challengeType, scheme, nvp.getName(), null); |
| } |
| } |
| return new AuthChallenge(challengeType, scheme, null, params.size() > 0 ? params : null); |
| } |
| if (params.size() == 1) { |
| final NameValuePair nvp = params.get(0); |
| if (nvp.getValue() == null) { |
| return new AuthChallenge(challengeType, nvp.getName(), null, null); |
| } |
| } |
| throw new ParseException("Malformed auth challenge"); |
| } |
| |
| } |