edu.ksu.canvas.oauth.OauthTokenRefresher Maven / Gradle / Ivy

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A native Java library to talk to the Canvas REST API
There is a newer version: 2.0.0
package edu.ksu.canvas.oauth;

import java.io.IOException;
import java.io.Serializable;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;

import com.google.gson.Gson;

import edu.ksu.canvas.impl.GsonResponseParser;


public class OauthTokenRefresher implements Serializable {
    private static final long serialVersionUID = 1L;

    private static final Logger LOG = Logger.getLogger(OauthTokenRefresher.class);

    private static final int TIMEOUT_SECONDS = 10;
    private final String clientId;
    private final String clientSecret;
    private final String canvasUrl;

    public OauthTokenRefresher(String clientId, String clientSecret, String canvasUrl) {
        this.clientId = clientId;
        this.clientSecret = clientSecret;
        this.canvasUrl = canvasUrl;
    }

    public TokenRefreshResponse getNewToken(String refreshToken) throws IOException {
        LOG.debug("Getting a fresh OAuth access token");
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpParams httpParams = httpClient.getParams();
        HttpConnectionParams.setConnectionTimeout(httpParams, TIMEOUT_SECONDS*1000);
        HttpConnectionParams.setSoTimeout(httpParams, TIMEOUT_SECONDS*1000);

        String url = canvasUrl + "/login/oauth2/token?grant_type=refresh_token&client_id=" + clientId + "&client_secret=" + clientSecret + "&refresh_token=" + refreshToken;
        HttpPost postRequest = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(postRequest);
        int statusCode = httpResponse.getStatusLine().getStatusCode();
        if(statusCode == 401) {
            LOG.error("Unauthorized refresh token request. Wrong client_id or secret?");
            return null;
        }
        if(statusCode != 200) {
            LOG.error("Non-200 status code ( " + statusCode + " )returned while requesting an access token at URL " + url);
            HttpEntity errorEntity = httpResponse.getEntity();
            if(errorEntity != null) {
                String errorBody = EntityUtils.toString(errorEntity);
                LOG.error("Response from Canvas: " + errorBody);
            }
            return null;
        }
        HttpEntity entity = httpResponse.getEntity();
        String responseBody = EntityUtils.toString(entity);
        Gson gson = GsonResponseParser.getDefaultGsonParser(false);
        return gson.fromJson(responseBody, TokenRefreshResponse.class);
    }
}