com.concentricsky.android.khanacademy.data.remote.SpringRequestFactory.java Source code

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Here is the source code for com.concentricsky.android.khanacademy.data.remote.SpringRequestFactory.java

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/*
Viewer for Khan Academy
Copyright (C) 2012 Concentric Sky, Inc.
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.concentricsky.android.khanacademy.data.remote;

import java.io.IOException;
import java.net.URI;

import oauth.signpost.OAuthConsumer;
import oauth.signpost.exception.OAuthCommunicationException;
import oauth.signpost.exception.OAuthExpectationFailedException;
import oauth.signpost.exception.OAuthMessageSignerException;

import org.apache.http.Header;
import org.apache.http.client.methods.HttpGet;
import org.springframework.http.HttpMethod;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;

public class SpringRequestFactory implements ClientHttpRequestFactory {

    private OAuthConsumer consumer;

    public SpringRequestFactory(OAuthConsumer consumer) {
        this.consumer = consumer;
    }

    @Override
    public ClientHttpRequest createRequest(URI uri, HttpMethod httpMethod) throws IOException {

        /*
         * Note: This is a bit ugly, and it comes from working with two different libraries.
         * This could probably be cleaned up by integrating Spring's auth library and using
         * that instead of OAuth Signpost. Signpost was here first though, and works well 
         * enough.
         */

        // build a default request
        SimpleClientHttpRequestFactory defaultFactory = new SimpleClientHttpRequestFactory();
        ClientHttpRequest request = defaultFactory.createRequest(uri, httpMethod);

        // now build a bogus CommonsHttp request, sign it, and grab the headers.
        HttpGet bogusRequest = new HttpGet(uri);

        try {
            consumer.sign(bogusRequest);
        } catch (OAuthMessageSignerException e) {
            e.printStackTrace();
        } catch (OAuthExpectationFailedException e) {
            e.printStackTrace();
        } catch (OAuthCommunicationException e) {
            e.printStackTrace();
        }

        // finally, apply those headers to our request, and return it
        Header[] headers = bogusRequest.getAllHeaders();
        for (Header h : headers) {
            request.getHeaders().set(h.getName(), h.getValue());
        }

        return request;
    }
}