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ddqd/DigestAuthenticator

Created December 3, 2014 13:37
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Revisions

  1. ddqd created this gist Dec 3, 2014.
    67 changes: 67 additions & 0 deletions DigestAuthenticator
    View file
    Original file line number Diff line number Diff line change
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    import android.util.Log;

    import com.squareup.okhttp.Request;
    import com.squareup.okhttp.Response;

    import org.apache.http.auth.AuthenticationException;
    import org.apache.http.auth.Credentials;
    import org.apache.http.auth.MalformedChallengeException;
    import org.apache.http.impl.auth.DigestScheme;
    import org.apache.http.message.BasicHeader;
    import org.apache.http.message.BasicHttpRequest;

    import java.io.IOException;
    import java.net.Proxy;

    import javax.inject.Inject;

    public class DigestAuthenticator implements com.squareup.okhttp.Authenticator {
    @Inject DigestScheme mDigestScheme;
    @Inject org.apache.http.auth.Credentials mCredentials;

    public DigestAuthenticator(Credentials credentials) {
    mCredentials = credentials;
    mDigestScheme = new DigestScheme();
    }

    @Override
    public Request authenticate(Proxy proxy, Response response) throws IOException {
    String authHeader = buildAuthorizationHeader(response);
    if (authHeader == null) {
    return null;
    }
    return response.request().newBuilder().addHeader("Authorization", authHeader).build();
    }

    @Override
    public Request authenticateProxy(Proxy proxy, Response response) throws IOException {
    return null;
    }

    private String buildAuthorizationHeader(Response response) throws IOException {
    processChallenge("WWW-Authenticate", response.header("WWW-Authenticate"));
    return generateDigestHeader(response);
    }

    private void processChallenge(String headerName, String headerValue) {
    try {
    mDigestScheme.processChallenge(new BasicHeader(headerName, headerValue));
    } catch (MalformedChallengeException e) {
    Log.e(e.toString(), "Error processing header " + headerName + " for DIGEST authentication.");
    }
    }

    private String generateDigestHeader(Response response) throws IOException {
    org.apache.http.HttpRequest request = new BasicHttpRequest(
    response.request().method(),
    response.request().uri().toString()
    );

    try {
    return mDigestScheme.authenticate(mCredentials, request).getValue();
    } catch (AuthenticationException e) {
    Log.e(e.toString(), "Error generating DIGEST auth header.");
    return null;
    }
    }
    }