APRedirectHandler.java

package de.danoeh.antennapodsp.service.download;

import android.util.Log;
import de.danoeh.antennapodsp.AppConfig;
import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.impl.client.DefaultRedirectHandler;
import org.apache.http.protocol.HttpContext;

import java.net.URI;

public class APRedirectHandler extends DefaultRedirectHandler {
    // Identifier for logger
    private static final String TAG = "APRedirectHandler";
    // Header field, which has to be potentially fixed
    private static final String LOC = "Location";
    // Regular expressions for character strings, which should not appear in URLs
    private static final String CHi[] = {"\\{", "\\}", "\\|", "\\\\", "\\^", "~", "\\[", "\\]", "\\`"};
    private static final String CHo[] = {"%7B", "%7D", "%7C", "%5C", "%5E", "%7E", "%5B", "%5D", "%60"};

    /**
     * Workaround for broken URLs in redirection.
     * Proper solution involves LaxRedirectStrategy() which is not available in
     * current API yet.
     */
    @Override
    public URI getLocationURI(HttpResponse response, HttpContext context)
            throws org.apache.http.ProtocolException {

        Header h[] = response.getHeaders(LOC);
        if (h.length > 0) {
            String s = h[0].getValue();

            // Fix broken URL
            for (int i = 0; i < CHi.length; i++)
                s = s.replaceAll(CHi[i], CHo[i]);

            // If anything had to be fixed, then replace the header
            if (!s.equals(h[0].getValue())) {
                if (AppConfig.DEBUG)
                    Log.d(TAG, "Original URL: " + h[0].getValue());

                response.setHeader(LOC, s);

                if (AppConfig.DEBUG)
                    Log.d(TAG, "Fixed URL:    " + s);
            }
        }

        // call DefaultRedirectHandler with fixed URL
        return super.getLocationURI(response, context);
    }
}