topical media & game development
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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mashup-flickr-07-Exercise-2-lib-FlickrAuthenticator.php / php



  <?php
  
  class FlickrAuthenticator
  {
    var flickr;
    var apikey;
    var secret;
    var auth;
  
    var errorPage;
  
    function FlickrAuthenticator(apikey, secret)
    {
      this->apikey = apikey;
      this->secret = secret;
      this->flickr = new phpFlickr(apikey, secret, false);
      this->errorPage = 'http://' . _SERVER['HTTP_HOST'] . '/error.php';
    }
  
    function authenticate(requiredPerms)
    {
      doAuth = true;
      token = _SESSION['FlickrAuthenticationToken'];
      this->setToken(token);
      if (!empty(token))
      {
        auth = this->flickr->auth_checkToken();
        if (this->flickr->getErrorCode())
        {
          this->setToken(NULL);
        }
        else
        {
          // We have a good token
          // Check we have the required privileges
          perms = auth['perms'];
  
          switch (perms)
          {
            case "read":
              if (requiredPerms == "read")
              {
                doAuth = false;
              }
              break;
  
            case "write":
              if (requiredPerms == "read" || requiredPerms == "write")
              {
                doAuth = false;
              }
              break;
  
            case "delete":
              if (requiredPerms == "read" || requiredPerms == "write" 
                || requiredPerms == "delete")
              {
                doAuth = false;
              }
              break;
          }
  
          if (!doAuth)
          {
            // No further authentication necessary, so store away
            // the results from checkToken
            this->auth = auth;
            _SESSION['FlickrAuthenticatedUser'] = auth['user']['username'];
          }
        }
      }
  
      if (doAuth)
      {
        // Need to authenticate - redirect to flickr
        extra = _SERVER['REQUEST_URI'];
        apisig = md5(this->secret . "api_key" . this->apikey . "extra" . extra 
          . "perms" . requiredPerms);
        url = 'http://www.flickr.com/services/auth/?api_key=' . this->apikey 
          . '&extra=' . extra . '&perms=' . requiredPerms . '&api_sig='. apisig;
        header("Location: " . url);
        exit(0);
      }
    }
  
    function updateCredentials(frob)
    {
      this->setToken(NULL);
      token = this->flickr->auth_getToken(frob);
      if (!this->flickr->getErrorCode())
      {
        this->setToken(token);
        auth = this->flickr->auth_checkToken();
        if (this->flickr->getErrorCode())
        {
          this->setToken(NULL);
          this->error("There was a problem checking the authentication token: " 
            . this->flickr->getErrorCode() . " " . this->flickr->getErrorMsg());
        }
      }
      else
      {
        this->setToken(NULL);
        this->error("There was a problem getting the authentication token: " 
          . this->flickr->getErrorCode() . " " . this->flickr->getErrorMsg());
      }
    }
  
    function setToken(token)
    {
      _SESSION['FlickrAuthenticationToken'] = token;
      unset(_SESSION['phpFlickr_auth_token']);
      this->flickr->setToken(token);
    }
  
    function error(message)
    {
      _SESSION['error'] = message;
      header('Location: ' . this->errorPage);        
      exit(0);
    }
  }
  ?>
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 20/2/2008

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