Play Framework: getting foursquare access token - web-services

Question

I am trying to grasp how Play framework handles its web service calls.
This is Foursquare's directions (after 1 and 2):
Your server will make a request for
https://foursquare.com/oauth2/access_token
?client_id=YOUR_CLIENT_ID
&client_secret=YOUR_CLIENT_SECRET
&grant_type=authorization_code
&redirect_uri=YOUR_REGISTERED_REDIRECT_URI
&code=CODE
The response will be JSON
{ access_token: ACCESS_TOKEN }
And this is my code:
public static Result index() {
String base = "http://foursquare.com/oauth2/authenticate";
String clientId = "?client_id=***";
String responseType = "&response_type=code";
String redirectUri = "&redirect_uri=http://localhost:9000/code";
return redirect(base + clientId + responseType + redirectUri);
}
public static Result code() {
String base = "http://foursquare.com/oauth2/access_token";
String clientId = "?client_id=***";
String clientsecret = "&client_secret=***";
String grantType = "&grant_type=authorization_code";
String redirectUri = "&redirect_uri=http://localhost:9000/json";
String code = "&code=" + request().getQueryString("code");
return redirect(base + clientId + clientsecret + grantType
+ redirectUri + code);
}
There are two things I am curios about:
1) I am redirected to a page with the access token displayed on screen:
URL: https://foursquare.com/oauth2/access_token?client_id=***&client_secret=***&grant_type=authorization_code&redirect_uri=http://localhost:9000/json&code=***
With this displayed:
{"access_token":"***"}
I would have expected to be redirected to http://localhost:9000/json as that was the redirect uri...
2) How do I grab the access token? I have tried using the asynchronous web service calls vis http://www.playframework.com/documentation/2.2.x/JavaWS but I cannot make them work.
My attempt:
String feedUrl = base + clientId + clientsecret + grantType
+ redirectUri + code;
final Promise<Result> resultPromise = WS.url(feedUrl).get().map(
new Function<WS.Response, Result>() {
public Result apply(WS.Response response) {
return ok("Feed title:" + response.asJson().findPath("access_token").asText());
}
}
);
return resultPromise;
This gives me an exception: [ConnectException: Connection refused: no further information: foursquare.com/107.23.103.139:80 to http://foursquare.com/oauth2/access_token]
All help is appreciated greatly!

Answer 1

This is the class that I made to get the foursquare access_token and submit a new search to foursquare:
public class Application extends Controller {
static final String HOST_AUTHENTICATE = "foursquare.com/oauth2/authenticate";
static final String HOST_ACCESS_TOKEN = "https://www.foursquare.com/oauth2/access_token";
static final String CLIENT_ID = "***";
static final String REDIRECT_URI = "http://localhost:9000/code";
static final String CLIENT_SECRET = "***";
static final String GRANT_TYPE = "authorization_code";
static final String RESPONSE_TYPE = "code";
static final String FOURSQUARE_API_FRIENDS = "https://api.foursquare.com/v2/users/self/friends";
public static Result index() {
String uri = new URIBuilder().setScheme("https").setHost(HOST_AUTHENTICATE)
.setParameter("client_id", CLIENT_ID).setParameter("response_type", RESPONSE_TYPE)
.setParameter("redirect_uri", REDIRECT_URI).toString();
return redirect(uri);
}
public static Promise<Result> code() {
WSRequestHolder authenticate = WS.url(HOST_ACCESS_TOKEN).setQueryParameter("client_id", CLIENT_ID)
.setQueryParameter("client_secret", CLIENT_SECRET).setQueryParameter("grant_type", GRANT_TYPE)
.setQueryParameter("redirect_uri", REDIRECT_URI)
.setQueryParameter("code", request().getQueryString("code").toString());
final Promise<Result> resultPromise = authenticate.get().flatMap(new Function<WS.Response, Promise<Result>>() {
public Promise<Result> apply(WS.Response response) {
JsonNode json = response.asJson();
return WS.url(FOURSQUARE_API_FRIENDS).setQueryParameter("oauth_token", json.findPath("access_token").asText())
.setQueryParameter("v", "20131108").get().map(new Function<WS.Response, Result>() {
public Result apply(WS.Response response) {
return ok(response.asJson());
}
});
}
});
return resultPromise;
}
}