OAuth signed POST request with Volley + oauth-signpost

OAuthPostHurlStack.java

public class OAuthPostHurlStack extends HurlStack {

    private final OAuthConsumer mConsumer;
    private ArrayList<String> mOauthSignedPosts = new ArrayList<>();

    public OAuthPostHurlStack(OAuthConsumer consumer) {
        mConsumer = consumer;
    }

    @Override
    public HttpResponse performRequest(Request<?> request, Map<String, String> additionalHeaders)
            throws IOException, AuthFailureError {

        if (request.getMethod() == Request.Method.POST) {
            if (request instanceof CustomRequest) {
                // Flag for OAuth POST request
                mOauthSignedPosts.add(request.getUrl());
                // Make OAuth parameters with POST parameters
                HttpParameters oauthParams = new HttpParameters();
                Map<String, String> params = ((CustomRequest) request).getParams();
                for (String key : params.keySet()) {
                    oauthParams.put(key, OAuth.percentEncode(params.get(key)));
                }
                // Add end point url for OAuth params
                oauthParams.put("realm", request.getUrl());
                // Set params to consumer
                mConsumer.setAdditionalParameters(oauthParams);
            }
        }

        return super.performRequest(request, additionalHeaders);
    }

    @Override
    protected HttpURLConnection createConnection(URL url) throws IOException {
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        try {
            if (mOauthSignedPosts.contains(url)) {
                // If the post request needs OAuth signing,
                // set method "POST" and DoOutput true.
                connection.setRequestMethod("POST");
                connection.setDoOutput(true);
                mOauthSignedPosts.remove(url);
            }
            mConsumer.sign(connection);
        } catch (OAuthMessageSignerException e) {
            e.printStackTrace();
        } catch (OAuthExpectationFailedException e) {
            e.printStackTrace();
        } catch (OAuthCommunicationException e) {
            e.printStackTrace();
        }
        return connection;
    }
}

Thanks for the implementation

mOauthSignedPosts.contains(url) fails. Needs to convert to string. mOauthSignedPosts.contains(url.toString()) works.