Sakai Rest API login from Java

[Chaitanya Cheekate]

Hi All,

I am logging into sakai using web service(/direct/session/new) but it's not saving the sessionId in cookie. Due to this I was unable to continue the session.

But it's working in below scenarios

Sakai Mobile App: In our mobile app, Session is persisting if I invoke the same login web service from Titanium appcelerator http client.

SakaiPy(Python API): This api using python's session.post which is able to set session cookie as per below code from the file.

session.post(self.baseURL+loginURL.format(connectionInfo['username'],connectionInfo['password']))

Can you please help me out.

Posted in stackoverflow also.

--

Thanks.

[William Karavites]

I'm the author of SakaiPy. I haven't had much time (recently) to do much work on it as the office has been busy. There's a TON more of what I want to accomplish with the library.

Once things settle down in the office I'll see how I can help you with storing the session using web service.

In the meantime, can you please give me/us examples of the code you're trying to use for storing the sessionid?

-Will

------------------------------------
William Karavites
Application Programmer
OIT/OIRT- Rutgers University
Office: 848-445-8726
Cell: 732-822-9405
will...@rutgers.edu
http://willkara.com
------------------------------------

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From: "Chaitanya Cheekate" <chaitanya...@vidyayug.com>
To: saka...@apereo.org
Sent: Monday, August 17, 2015 9:33:46 AM
Subject: [sakai-dev] Sakai Rest API login from Java

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[Chaitanya Cheekate]

Hi William,

I forgot to mention that I am trying to make it work in java.

As of now I just wrote web service call to get the session id.


        URL url = new URL(webserviceURL);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        conn.setRequestProperty("Content-Type",
                "application/x-www-form-urlencoded");
       
        conn.setRequestProperty("Content-Length", params.toString().length()
                + "");
        conn.connect();

        OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
        wr.write(params.toString());
        wr.flush();
        // Get the response
        InputStream is;
        System.out.println(conn.getResponseCode());
        if (conn.getResponseCode() == 200 || conn.getResponseCode()==201) {
            is = conn.getInputStream();
        } else {
            is = conn.getErrorStream();
        }
       
        String responseData = IOUtils.toString(is, "UTF-8");
        wr.close();
        System.out.println("responseData" + responseData);
 
  

Thank you.

--

Thanks.

[Schauer, Christopher R]

The cookie is in the response, you'll either have to grab it from the 'Set-Cookie' response header yourself or use a library that manages cookies for you. The java.net API offers a CookieHandler class that will manage cookies system-wide. There's some documentation here: https://docs.oracle.com/javase/tutorial/networking/cookies/index.html.

You might also want to look into HttpClient (http://hc.apache.org/httpcomponents-client-ga/tutorial/html/) which is an alternative to HttpURLConnection. The cookie management is a bit easier to deal with on a per request basis in my opinion.

-Chris

[Will Karavites]

Chat,

We’re doing our major Summer deploy today (10-10.x). I’ll try to get back to you later today with some comments about the java code!

-Will

[Chaitanya Cheekate]

Hi Chris,

Thanks for your suggestion. Using HttpClient API  I am able to hold the session.

Below is the Sample code:

//create httpclient
HttpClient httpClient = HttpClientBuilder.create().build();

//store cookies in context
CookieStore cookieStore = new BasicCookieStore();
HttpContext httpContext = new BasicHttpContext();
httpContext.setAttribute(HttpClientContext.COOKIE_STORE, cookieStore);

//call login web service
HttpPost postRequest = new HttpPost(webserviceURL);
postRequest.setHeader("Content-Type", "application/x-www-form-urlencoded");
postRequest.setEntity(new UrlEncodedFormEntity(params));
HttpResponse response = httpClient.execute(postRequest, httpContext);

//get the status code
int status = response.getStatusLine().getStatusCode();

//if status code is 201 login is successful. So reuse the httpContext for next requests.
//if status code is not 201, there is a problem with the request.
if(status!=201)
    return null;
       
EntityUtils.consume( response.getEntity() );

--

Thanks.

[Alain Fernandez del Toro]

Any way of doing this without the reuse of the context?

Like passing the sessionid as a parameter, header or something?

[Matthew Jones]

Yeah you should be able to use the parameter sakai.session

https://jira.sakaiproject.org/browse/SAK-14899

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[Adam Marshall]

You could use oauth?

Adam

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