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Connecting to FourSquare API V2 using PHP

I use this guide to get fast and dirty OAuth authentication so that I can play with the API. Unfortunately, his textbook seems spotty. The link to the EpiOAuth.php file was not found in its link, and I had to do a Google search to find a copy. After running index.php for the first time, to get my token, I got a "missing parameter" error in the line $ results = $ foursquareObj-> getAuthorizeUrl () in index.php. Even manually putting my callback URL, my token returns as "h":

Login Via Foursquare
string(1) "h"

Which is obviously wrong. How am I doing this wrong?

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1 answer

, OAuth. foursquare, , . , OAuth, API.

//secrets.php

<?php  
  // insert your foursquare API keys
  define('CLIENT_ID', 'YOUR_CLIENT_ID');
  define('CLIENT_SECRET', 'YOUR_CLIENT_SECRET');

LOCALHOST//4sq_Login.php

<?php
// Foursquare login stage 1, build url and redirect
  require_once('secrets.php'); //defines CLIENT_ID

// build $url
  $url = 'https://foursquare.com/oauth2/authenticate';
  $url .= '?client_id='.CLIENT_ID;
  $url .= '&response_type=code';
  $url .= '&redirect_uri=http://localhost/scripts/4sq_Callback.php'; // change to your 4sq callback

// redirect
  header( 'Location: '.$url ) ;

LOCALHOST//4sq_Callback.php

<?php
// Foursquare login step 2, echo back $code from QUERY_STRING
  require_once('secrets.php'); // defines CLIENT_ID & CLIENT_SECRET

// get $code from QUERY_STRING
  parse_str($_SERVER['QUERY_STRING'], $query);
  $code = $query['code'];

// build url
  $url = 'https://foursquare.com/oauth2/access_token';
  $url .= '?client_id='.CLIENT_ID;
  $url .= '&client_secret='.CLIENT_SECRET;
  $url .= '&grant_type=authorization_code';
  $url .= '&redirect_uri=http://localhost/scripts/4sq_Callback.php'; //change to your 4sq callback
  $url .= '&code='.$code;

// call to https://foursquare.com/oauth2/access_token with $code
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_URL, $url);
  $result = curl_exec($ch);
  curl_close($ch);

// $result value is json {access_token: ACCESS_TOKEN}
  $values = json_decode($result, true);
  $token = $values['access_token'];

// set access_token cookie (if you wish)
  $expire = time()+2592000; // 30 days from now
  setcookie("foursquare_token", $token, $expire, '/');

// crosswindow scripting to pass back $token
  echo('<script type="text/javascript">');
  echo('opener.set4sqKey("'.$token.'");');
  echo('self.close();'); // close self
  echo('</script>');

/index.htm

<!DOCTYPE HTML>
<html>
<head>
<title>FourSquare test page...</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript">
<!--
var foursquareKey;

// Open foursquare login window.
function get4sqKey(){
  if(!foursquareKey){
    window.open('scripts/4sq_Login.php', 'foursquareAuth', 'width=960, height=548');
  }
}

// called crosswindow by login window
function set4sqKey(key){
  foursquareKey = key;
  setTimeout('alert("Logged into Foursquare");', 1); // setTimeout makes alert non-blocking
}

// simple alert to display OAuth token
function showKey(){
  alert(foursquareKey);
}

// -->
</script>
</head>
<body>
<a href="javascript:get4sqKey();">get4sqKey();</a> |
<a href="javascript:showKey();">showKey();</a>
</body>
</html>

, , , , .

( PHP , secrets.php -. :)

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