com.mongolduu.android.ng.misc.RedirectHandler.java Source code

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Here is the source code for com.mongolduu.android.ng.misc.RedirectHandler.java

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/*
 * Copyright (C) 2011 Erdene-Ochir Tuguldur (https://github.com/tugstugi)
 *
 * 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 com.mongolduu.android.ng.misc;

import java.net.URI;
import java.net.URISyntaxException;

import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.ProtocolException;
import org.apache.http.client.CircularRedirectException;
import org.apache.http.client.params.ClientPNames;
import org.apache.http.client.utils.URIUtils;
import org.apache.http.impl.client.DefaultRedirectHandler;
import org.apache.http.impl.client.RedirectLocations;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;

public class RedirectHandler extends DefaultRedirectHandler {

    private static final String REDIRECT_LOCATIONS = "http.protocol.redirect-locations";

    public boolean isRedirectRequested(final HttpResponse response, final HttpContext context) {
        if (response == null) {
            throw new IllegalArgumentException("HTTP response may not be null");
        }
        int statusCode = response.getStatusLine().getStatusCode();
        switch (statusCode) {
        case HttpStatus.SC_MOVED_TEMPORARILY:
        case HttpStatus.SC_MOVED_PERMANENTLY:
        case HttpStatus.SC_SEE_OTHER:
        case HttpStatus.SC_TEMPORARY_REDIRECT:
            return true;
        default:
            return false;
        } // end of switch
    }

    public URI getLocationURI(final HttpResponse response, final HttpContext context) throws ProtocolException {
        if (response == null) {
            throw new IllegalArgumentException("HTTP response may not be null");
        }
        // get the location header to find out where to redirect to
        Header locationHeader = response.getFirstHeader("location");
        if (locationHeader == null) {
            // got a redirect response, but no location header
            throw new ProtocolException(
                    "Received redirect response " + response.getStatusLine() + " but no location header");
        }
        // HERE IS THE MODIFIED LINE OF CODE
        String location = locationHeader.getValue().replaceAll(" ", "%20");

        URI uri;
        try {
            uri = new URI(location);
        } catch (URISyntaxException ex) {
            throw new ProtocolException("Invalid redirect URI: " + location, ex);
        }

        HttpParams params = response.getParams();
        // rfc2616 demands the location value be a complete URI
        // Location = "Location" ":" absoluteURI
        if (!uri.isAbsolute()) {
            if (params.isParameterTrue(ClientPNames.REJECT_RELATIVE_REDIRECT)) {
                throw new ProtocolException("Relative redirect location '" + uri + "' not allowed");
            }
            // Adjust location URI
            HttpHost target = (HttpHost) context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);
            if (target == null) {
                throw new IllegalStateException("Target host not available " + "in the HTTP context");
            }

            HttpRequest request = (HttpRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST);

            try {
                URI requestURI = new URI(request.getRequestLine().getUri());
                URI absoluteRequestURI = URIUtils.rewriteURI(requestURI, target, true);
                uri = URIUtils.resolve(absoluteRequestURI, uri);
            } catch (URISyntaxException ex) {
                throw new ProtocolException(ex.getMessage(), ex);
            }
        }

        if (params.isParameterFalse(ClientPNames.ALLOW_CIRCULAR_REDIRECTS)) {

            RedirectLocations redirectLocations = (RedirectLocations) context.getAttribute(REDIRECT_LOCATIONS);

            if (redirectLocations == null) {
                redirectLocations = new RedirectLocations();
                context.setAttribute(REDIRECT_LOCATIONS, redirectLocations);
            }

            URI redirectURI;
            if (uri.getFragment() != null) {
                try {
                    HttpHost target = new HttpHost(uri.getHost(), uri.getPort(), uri.getScheme());
                    redirectURI = URIUtils.rewriteURI(uri, target, true);
                } catch (URISyntaxException ex) {
                    throw new ProtocolException(ex.getMessage(), ex);
                }
            } else {
                redirectURI = uri;
            }

            if (redirectLocations.contains(redirectURI)) {
                throw new CircularRedirectException("Circular redirect to '" + redirectURI + "'");
            } else {
                redirectLocations.add(redirectURI);
            }
        }

        return uri;
    }
}