Well, have gotten a little wiser. The "cannot find anything named response"-error comes from the fact that quote:

"Example is intended to be run inside as a servlet so you cannot run it just as a Java application.You can use library inside a desktop Java application but you must handle authentication url redirection your self (for example by embedding web browser inside your application)."

I guess this leaves two options:

- Run it "inside" of processing as a servlet, (if that's even possible).

- Or like the quote says "handle authentication url redirection yourself" I wonder if processing's own network-library can handle this or would this be a pure java-solution.

Anyone with pointers, tips, experience or even examples is more than welcome :)
FRid

The frustrating thing about this is the fact i've haven't even been able to use the actual api. I can't get past the authorization-process. That damned Oauth!

https://developer.foursquare.com/overview/auth.html shows the steps necessary to get the Oauth-token from foursquare, in short:

Redirect users who wish to authenticate to

Update: I have a confused head too...

After hitting a dead-end i decided to go back to square one, ditched all the wrapper's and focus on where the problem lies: Oauth and getting that damned accestoken. So after trying (and failing, a bit too ambitious) to use java.net to handle everything i went searching for a wrapper for Oauth in general and found scribe, the (selfproclaimed?) simple Oauth java lib. I must say after a growing frustration and skepticism with the other api's, this actually lives up to it's name! :) It is simple and has definitely gotten me further than the others. They have supplied some working examples too but there's still a hurdle to take. See the example and post here:

Example:
https://github.com/fernandezpablo85/scribe-java/blob/master/src/test/java/org/scribe/examples/FoursquareExample.java

Post:
http://stackoverflow.com/questions/8092131/java-twitter-client-with-scribe-1st-time-using-it-how-to-post-status

The example-code runs to exactly the line the post is reffering to and, as the writer, i'm also/still confused. It's line 34 in the example that gets me confused: " And paste the verifier here" What "Verifier"? The verifier is not yet declared untill line 36. Line 34 yields an url which if i paste it in my browser takes me to the 4square-site and redirects me to the specified callback-url. So i've modified the chatserver-example to listen for incoming data at port 8888 which is specified as the callback-url > http://localhost:8888 but then i get this response:

"message from 127.0.0.1 GET /foursquare?error=redirect_uri_mismatch"

Unfortunately there is no mention of this error on the 4square's api-page so i'm a bit clueless again but i feel i'm getting tantalizingly close to getting that accestoken. After getting that it's just a matter of appending that to the apicalls and i'm home free!

So to sum it up, two basic questions-
-Is modifying the chatserver-example a good way to catch those callback's, if not what do u recommend?

- Anybody got any clue about the redirect_uri_mismatch and how to avoid/solve it?

FRid

The Oauth-client
https://github.com/fernandezpablo85/scribe-java

and you also need this to run scribe:
https://commons.apache.org/codec/

@#$% yeah! I finally got it! Thing about the verifier was that you needed to go to your browser and paste the url there then run the modified chatserver to catch the incoming accestoken, copy that token and paste it in the consolewindow? (of netbeans) then the code would go on running and exchange the token for the Oauthtoken. It was pasting in the consolewindow that confused me a lot and still does actually...

Had some trouble with the server but that was also solved.
FRid

Thanks for posting your progress. I feel I'm in the same boat! This Oauth stuff is very tough.

Hi Hebchop,

I'm assuming you're also using netbeans(or another ide that will let you paste into the console) to compile the code? If so you can paste the code you get from the modified server into the console and hit Enter to proceed to the last bit. Getting the code will require to receive it with the callback-url after that you're homefree.

Good luck,
FRid

This is the code i used to get the token

1. /*
    * To change this template, choose Tools | Templates
    * and open the template in the editor.
    */
   package foursquaretestu;
   
   import java.util.*;
   import org.scribe.builder.*;
   import org.scribe.builder.api.*;
   import org.scribe.model.*;
   import org.scribe.oauth.*;
   
   /**
    *
    * @author Ik
    */
   public class FourSquareTestu {
      
       private static final String PROTECTED_RESOURCE_URL = "https://api.foursquare.com/v2/users/self/friends?oauth_token=";
       private static final Token EMPTY_TOKEN = null;
   
       /**
        * @param args the command line arguments
        */
       public static void main(String[] args) {
           // TODO code application logic here
       String apiKey = "<yourstuff>";
       String apiSecret = "<yourstuff>";
       //String apiKey = "<yourstuff>";
       //String apiSecret = "<yourstuff>";
       //String apiKey = "<yourstuff>";
       //String apiSecret = "<yourstuff>";
       OAuthService service = new ServiceBuilder()
                                     .provider(Foursquare2Api.class)
                                     .apiKey(apiKey)
                                     .apiSecret(apiSecret)
                                     .callback("http://localhost:8888/foursquare")
                                     .build();
       Scanner in = new Scanner(System.in);
   
       System.out.println("=== Foursquare2's OAuth Workflow ===");
       System.out.println();
   
       // Obtain the Authorization URL
       System.out.println("Fetching the Authorization URL...");
       String authorizationUrl = service.getAuthorizationUrl(EMPTY_TOKEN);
       System.out.println("Got the Authorization URL!");
       System.out.println("Now go and authorize Scribe here:");
       System.out.println(authorizationUrl);
       System.out.println("And paste the authorization code here");
       System.out.print(">>");
       Verifier verifier = new Verifier(in.nextLine());
   
       System.out.println();
      
       // Trade the Request Token and Verfier for the Access Token
       System.out.println("Trading the Request Token for an Access Token...");
       Token accessToken = service.getAccessToken(EMPTY_TOKEN, verifier);
       System.out.println("Got the Access Token!");
       System.out.println("(if your curious it looks like this: " + accessToken + " )");
       System.out.println();
   
       // Now let's go and ask for a protected resource!
       System.out.println("Now we're going to access a protected resource...");
       OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL + accessToken.getToken());
       service.signRequest(accessToken, request);
       Response response = request.send();
       System.out.println("Got it! Lets see what we found...");
       System.out.println();
       System.out.println(response.getCode());
       System.out.println(response.getBody());
   
       System.out.println();
       System.out.println("Thats it man! Go and build something awesome with Scribe! :)");
   
   
       }
   }
   
   

This is the modified chatserver, just paste this into a new sketch. If you run the foursquare/scribe-thing you will get an authorization-url, copy/paste this into your browser and go to the adress, before you click yes to the message run this processing-sketch and after clicking the code should appear in the p5-window, click it to save the txt-file. Open the textfile and copy the code and paste this into the console and that should be it.

1. import processing.net.*;
   
   int port = 8888;
   boolean myServerRunning = true;
   int bgColor = 0;
   int direction = 1;
   int textLine = 60;
   
   Server myServer;
   ArrayList strings;
   PrintWriter output;
   
   void setup()
   {
     size(1000, 500);
     textFont(createFont("SanSerif", 16));
     strings = new ArrayList();
     myServer = new Server(this, port); // Starts a myServer on port 10002
     output = createWriter("output.txt");
     background(0);
   }
   
   void mousePressed()
   {
     // If the mouse clicked the myServer stops
     for (int i=0;i<strings.size();i++) {
       String s = (String) strings.get(i);
       output.println(s);   
     }
     output.flush(); // Writes the remaining data to the file
     output.close(); // Finishes the file
     myServer.stop();
     myServerRunning = false;
     exit(); // Stops the program
   }
   
   void draw()
   {
     if (myServerRunning == true)
     {
       text("server", 15, 45);
       Client thisClient = myServer.available();
       if (thisClient != null) {
         if (thisClient.available() > 0) {
           text("mesage from: " + thisClient.ip() + " : " + thisClient.readString(), 15, textLine);
           String temp = thisClient.readString();
           strings.add(temp);
           println(thisClient.readString());
           textLine = textLine + 35;
         }
       }
     }
     else
     {
       text("server", 15, 45);
       text("stopped", 15, 65);
     }
   }
   
   

If you don't mind sharing the scribe-part i'm curious to see how you've managed to get it working in processing.

"but isn't there a way we could save some kind of set of strings or passwords to not require this copy + paste effort each time?"

- Don't know about twitter but once you get the Oauthtoken from foursquare you can append that to the search-queries and it is re-usable and concerning twitter i seriously recommend using twitter4j, very accessible compared to foursquare.

Hth,
FRid

Thanks, I'm now looking at Twitter4j. My project is going to connect to a lot of different APIs so I was looking for one easy way to oauth in. But I think I'll just use the specialized libs like Twitter4j when available and just publicly scrape the rest of the stuff I need. 

Thanks for giving a peek, i was curious to see how you've solved the input-part. Hadn't thought of controlp5, nice one.

"Maybe I don't understand the difference of consumer oAuth and 3 legged and all such things. " -same here yeah :)

FRid