package org.apache.http.impl.client;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.FormattedHeader;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.auth.AuthScheme;
import org.apache.http.auth.AuthSchemeRegistry;
import org.apache.http.auth.AuthenticationException;
import org.apache.http.auth.MalformedChallengeException;
import org.apache.http.client.AuthenticationHandler;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.Asserts;
import org.apache.http.util.CharArrayBuffer;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;

/** @deprecated */
@Deprecated
@Contract(
   threading = ThreadingBehavior.IMMUTABLE
)
public abstract class AbstractAuthenticationHandler implements AuthenticationHandler {
   private final Log log = LogFactory.getLog(this.getClass());
   private static final List<String> DEFAULT_SCHEME_PRIORITY = Collections.unmodifiableList(Arrays.asList("Negotiate", "NTLM", "Digest", "Basic"));

   protected Map<String, Header> parseChallenges(Header[] headers) throws MalformedChallengeException {
      Map<String, Header> map = new HashMap(headers.length);

      for(Header header : headers) {
         CharArrayBuffer buffer;
         int pos;
         if (header instanceof FormattedHeader) {
            buffer = ((FormattedHeader)header).getBuffer();
            pos = ((FormattedHeader)header).getValuePos();
         } else {
            String s = header.getValue();
            if (s == null) {
               throw new MalformedChallengeException("Header value is null");
            }

            buffer = new CharArrayBuffer(s.length());
            buffer.append(s);
            pos = 0;
         }

         while(pos < buffer.length() && HTTP.isWhitespace(buffer.charAt(pos))) {
            ++pos;
         }

         int beginIndex;
         for(beginIndex = pos; pos < buffer.length() && !HTTP.isWhitespace(buffer.charAt(pos)); ++pos) {
         }

         String s = buffer.substring(beginIndex, pos);
         map.put(s.toLowerCase(Locale.ROOT), header);
      }

      return map;
   }

   protected List<String> getAuthPreferences() {
      return DEFAULT_SCHEME_PRIORITY;
   }

   protected List<String> getAuthPreferences(HttpResponse response, HttpContext context) {
      return this.getAuthPreferences();
   }

   public AuthScheme selectScheme(Map<String, Header> challenges, HttpResponse response, HttpContext context) throws AuthenticationException {
      AuthSchemeRegistry registry = (AuthSchemeRegistry)context.getAttribute("http.authscheme-registry");
      Asserts.notNull(registry, "AuthScheme registry");
      Collection<String> authPrefs = this.getAuthPreferences(response, context);
      if (authPrefs == null) {
         authPrefs = DEFAULT_SCHEME_PRIORITY;
      }

      if (this.log.isDebugEnabled()) {
         this.log.debug("Authentication schemes in the order of preference: " + authPrefs);
      }

      AuthScheme authScheme = null;

      for(String id : authPrefs) {
         Header challenge = (Header)challenges.get(id.toLowerCase(Locale.ENGLISH));
         if (challenge != null) {
            if (this.log.isDebugEnabled()) {
               this.log.debug(id + " authentication scheme selected");
            }

            try {
               authScheme = registry.getAuthScheme(id, response.getParams());
               break;
            } catch (IllegalStateException var11) {
               if (this.log.isWarnEnabled()) {
                  this.log.warn("Authentication scheme " + id + " not supported");
               }
            }
         } else if (this.log.isDebugEnabled()) {
            this.log.debug("Challenge for " + id + " authentication scheme not available");
         }
      }

      if (authScheme == null) {
         throw new AuthenticationException("Unable to respond to any of these challenges: " + challenges);
      } else {
         return authScheme;
      }
   }
}
