Hello. I am new to Restlet client programming. I am attempting to use Restlet
client 2.1.6 on Android.
I have read the documentation on SSL config by way of DefaultSslContextFactory,
as well as having read StackOverflow articles on configuring an
HttpsClientHelper. I chose the latter route, as I could convince myself that
the client helper approach installed the helper for all subsequent use of
ClientResource. However, I cannot get this approach to work. I receive this
error message in an exception from the Restlet client when I attempt to connect
to the remote server:
Internal connector error 1002
No available client connector supports the required protocol: 2131034127.
Please add the JAR of a matching connector to your classpath.
Here is my approach in detail:
1) Perform this once before any network calls are made:
List<ConnectorHelper<Client>> registeredClients =
Engine.getInstance().getRegisteredClients();
registeredClients.add(0, new SslHelper(this));
where SslHelper is a subclass of HttpsClientHelper and is defined by
package com.homosuperiorus.clips.clients;
import android.content.Context;
import android.util.Log;
import com.homosuperiorus.clips.R;
import org.restlet.ext.ssl.HttpsClientHelper;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import javax.net.ssl.KeyManager;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManagerFactory;
public class SslHelper extends HttpsClientHelper {
private final String TAG = "SslHelper";
private KeyStore trustStore;
public SslHelper(Context appContext) {
super(null);
InputStream inputStream =
appContext.getResources().openRawResource(R.raw.keystore);
try {
trustStore = KeyStore.getInstance("BKS");
trustStore.load(inputStream, "changeit".toCharArray());
} catch (Exception e) {
Log.d(TAG, "Keystore error", e);
throw new RuntimeException(e);
} finally {
try {
inputStream.close();
} catch (IOException e) {
Log.d(TAG, "error closing keystore inputStream", e);
}
}
}
@Override
protected SSLContext getSslContext() {
try {
SSLContext sslContext = SSLContext.getInstance("TLS");
TrustManagerFactory tmf = TrustManagerFactory.getInstance("PKIX");
tmf.init(trustStore);
sslContext.init(new KeyManager[0], tmf.getTrustManagers(), null);
setSslContext(sslContext);
return sslContext;
} catch (NoSuchAlgorithmException shouldNeverHappen) {
throw new RuntimeException(shouldNeverHappen);
} catch (KeyStoreException shouldNeverHappen) {
throw new RuntimeException(shouldNeverHappen);
} catch (KeyManagementException shouldNeverHappen) {
throw new RuntimeException(shouldNeverHappen);
}
}
}
The BKS keystore loads successfully.
Next, I setup and make the client call:
public MyStuff getMyStuff() {
ClientResource resource = new ClientResource(BASEURL);
resource.setChallengeResponse(ChallengeScheme.HTTP_BASIC,
credentials.userName, credentials.password);
resource.accept(MediaType.APPLICATION_JSON);
MyStuff myStuff;
try {
myStuff = resource.getChild(PATH).get(MyStuff.class);
Log.d(TAG, myStuff.toString());
return myStuff;
} catch (ResourceException e) {
String reasonPhrase = e.getStatus().getReasonPhrase();
Log.d(TAG, String.format("Login with GET /mystuff failed:
status=%d, reason phrase=%s", e.getStatus().getCode(), reasonPhrase));
return null;
}
}
The client throws a ResourceException, with the detail I provided above.
My dependencies on restlet are as follows:
dependencies {
compile 'com.google.android:support-v4:r7'
compile 'com.google.code.gson:gson:2.2.4'
compile group: "org.restlet.android", name: "org.restlet", version:
versions.restlet
compile group: "org.restlet.android", name: "org.restlet.ext.json",
version: versions.restlet
compile group: "org.restlet.android", name: "org.restlet.ext.ssl", version:
versions.restlet
}
I feel like this code is one line from working, but I cannot tell which line.
It sounds like I need another restlet jar on the classpath, but I cannot take a
good guess at which one I'm missing.
Your help is much appreciated.
Thank you.
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