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Need Help with Processing and Facebook

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- 02-Oct-2012 05:27 PM
- Forum: Programming Questions
I need to write a code that will allow me to take pictures of of users sites via facebook. I have a partial code so far but have gotten confused and wanted to know if anyone could help me out, thanks.

/* VALUES YOU NEED TO PROVIDE */

// application api key and secret

String fbApiKey = "";

String fbApiSecret = "";

// a comma separated (no spaces!) list of user ids

String fbUserIDs = "3223230873634";

/* other settings */

// Facebook RESTful API

String fbRestServer = "http://api.facebook.com";

String fbRestNode = "/restserver.php";

XMLElement[] usersXml;

int currentUser = 0;

void setup ()

{

  size( 300, 200 );

  // the details / params in here define what will be read, see:

  // http://wiki.developers.facebook.com/index.php/Users.getInfo

  String xmlResponse = fbCallMethod( new String[] {

   "method=facebook.Users.getInfo",

   "uids=3223230873634" + fbUserIDs,

   "fields=uid,first_name,last_name", // see link above for more options

   "format=XML"

  });

  if ( xmlResponse == null ) // an error occured

  {

   exit();

   return;

  }

  XMLElement xml = new XMLElement( xmlResponse );

  usersXml = xml.getChildren( "user" );

  fill( 0 );

  textFont( createFont( "sans-serif", 24 ) );

  textAlign( CENTER );

  frameRate( 1 );

}

void draw ()

{

  background( 255 );

  String full_name = usersXml[currentUser].getChild("first_name").getContent();

  full_name += " " + usersXml[currentUser].getChild("last_name").getContent();

  text( full_name, width/2, height/2 );

  currentUser++;

  currentUser %= usersXml.length; // modulo, wrap around

}

/**

* Place a Facebook call (GET request) using Processing API ( loadStrings(), join() )

*/

String fbCallMethod ( String[] args )

{

  String[] params = new String[args.length + 3];

  System.arraycopy( args, 0, params, 0, args.length );

  params[params.length-3] = "api_key=" + fbApiKey;

  params[params.length-2] = "call_id=" + System.currentTimeMillis();

  params[params.length-1] = "v=1.0";

  String sig = fbGenerateSIG ( params );

  String paramString = join( params, "&" ) + "&sig=" + sig;

  String[] lines = loadStrings( fbRestServer + fbRestNode + "?" + paramString );

  if ( lines == null )

  {

   println( "OUCH, nothing to read from that URL:\n" + fbRestServer + fbRestNode + "?" + paramString );

   return null;

  }

  String response = join( lines, "\n" );

  return response;

}

/**

* Generate a call signature, see:

* http://wiki.developers.facebook.com/index.php/How_Facebook_Authenticates_Your_Application

* http://wiki.developers.facebook.com/index.php/Authorization_and_Authentication_for_Desktop_Applications

*/

String fbGenerateSIG ( String[] args )

{

  java.util.Arrays.sort( args );

  String argString = join( args, "" );

  argString += fbApiSecret;

  return md5Encode( argString );

}

/**

* MD5 encode a String using Processing API ( hex() )

*/

String md5Encode ( String data )

{

  java.security.MessageDigest digest = null;

  try {

   digest = java.security.MessageDigest.getInstance("MD5");

  }

  catch ( java.security.NoSuchAlgorithmException nsae ) {

   nsae.printStackTrace();

  }

   digest.update( data.getBytes() );

  byte[] hash = digest.digest();

  StringBuilder hexed = new StringBuilder();

  for ( int i = 0; i < hash.length; i++ )

  {

   hexed.append( hex( hash[i], 2 ) );

  }

  return hexed.toString().toLowerCase();

}

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