fix regression (issue #96): fix broken URLs in redirection instead of failing

1 files changed, 55 insertions, 0 deletions

diff --git a/src/de/danoeh/antennapod/service/download/APRedirectHandler.java b/src/de/danoeh/antennapod/service/download/APRedirectHandler.java
new file mode 100644
index 000000000..9416ef9d7
--- /dev/null
+++ b/src/de/danoeh/antennapod/service/download/APRedirectHandler.java
@@ -0,0 +1,55 @@
+package de.danoeh.antennapod.service.download;
+
+import java.net.URI;
+
+import org.apache.http.Header;
+import org.apache.http.HttpResponse;
+import org.apache.http.impl.client.DefaultRedirectHandler;
+import org.apache.http.protocol.HttpContext;
+
+import de.danoeh.antennapod.AppConfig;
+import android.util.Log;
+
+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);
+	}
+}