content: /*
   * Copyright 2013-2020 Agorava
   *
   * Licensed 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.
   */
  
  package org.agorava.oauth.helpers.extractors;
  
  import org.agorava.api.exception.AgoravaException;
  import org.agorava.api.extractor.ExtractorType;
  import org.agorava.api.extractor.TokenExtractor;
  import org.agorava.api.oauth.Token;
  import org.agorava.api.service.OAuthEncoder;
  import org.agorava.api.service.Preconditions;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import static org.agorava.api.extractor.ExtractorType.Type.TOKEN_STD;
  
  /**
   * Default implementation of {@code TokenExtractor}. Conforms to OAuth 1.0a
   * <p>
   * The process for extracting access and request tokens is similar so this class can do both things.
   *
   * @author Pablo Fernandez
   * @author Werner Keil
   * @see TokenExtractor
   */
  @ExtractorType(TOKEN_STD)
  public class TokenExtractor10 implements TokenExtractor {
      private static final Pattern TOKEN_REGEX = Pattern.compile("oauth_token=([^&]+)");
  
      private static final Pattern SECRET_REGEX = Pattern.compile("oauth_token_secret=([^&]*)");
  
      /**
       * {@inheritDoc}
       */
      public Token extract(String response) {
          Preconditions.checkEmptyString(response, "Response body is incorrect. Can't extract a token from an empty string");
          String token = extract(response, TOKEN_REGEX);
          String secret = extract(response, SECRET_REGEX);
          return new Token(token, secret);
      }
  
      private String extract(String response, Pattern p) {
          Matcher matcher = p.matcher(response);
          if (matcher.find() && matcher.groupCount() >= 1) {
              return OAuthEncoder.decode(matcher.group(1));
          } else {
              throw new AgoravaException("Response body is incorrect. Can't extract token and secret from this: '" + response +
                      "'", null);
          }
      }
  }
  