flickrapi.module in Flickr API 7

FlickAPI integration module.

The Flickr API module is as a helper module for other Drupal Flickr modules. You don't need this module unless another module requires it or you want to develop a new Flickr-based module.

File

flickrapi.module

<?php

/**
 * @file
 * FlickAPI integration module.
 *
 * The Flickr API module is as a helper module for other Drupal Flickr modules.
 * You don't need this module unless another module requires it or you want to
 * develop a new Flickr-based module.
 */

/**
 * Implements hook_menu().
 */
function flickrapi_menu() {
  $items = array();
  $items['admin/config/media/flickrapi'] = array(
    'title' => 'Flickr API Settings',
    'description' => 'Configure Flickr API credentials.',
    'access arguments' => array(
      'configure flickr api',
    ),
    'page callback' => 'drupal_get_form',
    'page arguments' => array(
      'flickrapi_admin_settings',
    ),
    'file' => 'flickrapi.admin.inc',
  );
  $items['admin/config/media/flickrapi/authenticate'] = array(
    'title' => 'Authenticate Flickr Credentials',
    'access arguments' => array(
      'configure flickr api',
    ),
    'page callback' => 'flickrapi_oauth_authenticate',
    'file' => 'flickrapi.admin.inc',
  );
  $items['admin/config/media/flickrapi/clear'] = array(
    'title' => 'Clear Flickr Credentials',
    'access arguments' => array(
      'configure flickr api',
    ),
    'page callback' => 'drupal_get_form',
    'page arguments' => array(
      'flickrapi_oauth_clear_form',
    ),
    'file' => 'flickrapi.admin.inc',
  );
  return $items;
}

/**
 * Implements hook_permission().
 */
function flickrapi_permission() {
  return array(
    'configure flickr api' => array(
      'title' => t('Configure Flickr API'),
      'description' => t('Set API keys and cache times for flickr queries'),
    ),
  );
}

/**
 * Implements hook_libraries_info().
 */
function flickrapi_libraries_info() {
  $libraries['phpFlickr'] = array(
    'name' => 'phpFlickr',
    'vendor url' => 'https://github.com/dan-coulter/phpflickr',
    'download url' => 'https://github.com/dan-coulter/phpflickr',
    'version' => 'No version',
    'files' => array(
      'php' => array(
        'phpFlickr.php',
      ),
    ),
  );
  return $libraries;
}

/**
 * Implements hook_flush_caches().
 */
function flickrapi_flush_caches() {
  flickrapi_phpFlickr(TRUE);
}

/**
 * Returns the phpFlickr object.
 *
 * If we need to change anything, such as making the cache configuration,
 * then it'll all be done here.
 *
 * @return phpFlickr
 *   The phpFlickr object
 */
function flickrapi_phpFlickr($clear_cache = FALSE) {
  $flickr = FALSE;
  $library = libraries_load('phpFlickr');

  // Check if the library is loaded properly.
  if (!empty($library) && $library['loaded'] !== FALSE) {
    $api_key = variable_get('flickrapi_api_key', '');
    $api_secret = variable_get('flickrapi_api_secret', '');
    $cache = variable_get('flickrapi_cache', '');
    $cache_dir = variable_get('flickrapi_cache_path', '');
    if (empty($api_key) || empty($api_secret)) {
      drupal_set_message(t("Flickr API key not set"), 'error');
      if (user_access('configure flickr api')) {
        drupal_set_message(t('Please !configure', array(
          '!configure' => l(t('configure the Flickr API settings'), 'admin/config/media/flickrapi'),
        )));
      }
    }
    $flickr = new phpFlickr($api_key, $api_secret);

    // Override the default post function to enable OAuth.
    $flickr
      ->setCustomPost('_flickrapi_post');

    // Enable caching.
    if ($cache == TRUE) {
      if ($clear_cache == TRUE) {
        $flickr
          ->enableCache('fs', $cache_dir, 0);
      }
      else {
        $flickr
          ->enableCache('fs', $cache_dir);
      }
    }
  }
  return $flickr;
}

/**
 * Override DrupalOAuthClient to use its protected get() function
 */
class FlickrApiOAuthClient extends DrupalOAuthClient {

  /**
   * Make an OAuth request.
   */
  public function get($path, $options = array()) {
    return parent::get($path, $options);
  }

}

/**
 * Custom post function to enable OAuth requests.
 *
 * @param String $url
 *   the callback url for the API
 *
 * @param Array $data
 *   associative array with all Flickr paramters
 *
 * @return String
 *   serialized PHP response format
 *   see: http://www.flickr.com/services/api/response.php.html
 */
function _flickrapi_post($url, $data) {
  $consumer = DrupalOAuthConsumer::load(variable_get('flickrapi_api_key', ''), FALSE);
  $sig_method = FlickrApiOAuthClient::signatureMethod();
  $client = new FlickrApiOAuthClient($consumer, NULL, $sig_method);
  $response = $client
    ->get($url, array(
    'token' => TRUE,
    'params' => $data,
  ));
  return $response;
}

/**
 * Implements hook_form_alter().
 *
 * If the API key has not been validated yet,
 * change the button text on the admin form.
 */
function flickrapi_form_flickrapi_admin_settings_alter(&$form, &$form_state) {
  if (!_flickrapi_is_authenticated()) {
    $form['actions']['submit']['#value'] = t('Authorize using OAuth');
  }
}

/**
 * Verification callback to check the token we received from Flickr
 *
 * Handles the last step in the authentication proces:
 *   - Exchanging the Request Token for an Access Token
 * See http://www.flickr.com/services/api/auth.oauth.html
 */
function flickrapi_oauth_token_verify() {
  module_load_include('module', 'oauth_common');
  $consumer = DrupalOAuthConsumer::load(variable_get('flickrapi_api_key', ''), FALSE);
  $request_token = DrupalOAuthToken::loadByKey($_GET['oauth_token'], $consumer, OAUTH_COMMON_TOKEN_TYPE_REQUEST);
  $client = new DrupalOAuthClient($consumer, $request_token);
  $access_token = $client
    ->getAccessToken('https://www.flickr.com/services/oauth/access_token', array(
    'verifier' => $_GET['oauth_verifier'],
  ));
  $request_token
    ->delete();
  drupal_set_message(t('Succesfully verified'));
  drupal_goto('admin/config/media/flickrapi');
}

/**
 * Tries to match an 'identifier' onto a flickr nsid.
 *
 * This function will first see whether $identifier is already
 * a nsid (format check only, no api call).  If it is not and the
 * identifier has the format of an email, an api call will be made to
 * check whether there is an nsid for that email.  If this is not the
 * case, the $identifier is treated as a username and an api call is
 * made to find the nsid for that username.
 *
 * If none of these succees, the result will be false
 *
 * @param Array $identifier
 *   identifier to find an nsid for
 *
 * @return String
 *   valid nsid or false if none can be found
 */
function flickrapi_get_user_nsid($identifier) {
  if (flickrapi_is_nsid($identifier)) {

    // Identifier is an NSID.
    return $identifier;
  }
  if ($f = flickrapi_phpFlickr()) {
    if (valid_email_address($identifier) && ($user = $f
      ->people_findByEmail($identifier))) {
      return $user['nsid'];
    }
    if ($user = $f
      ->people_findByUsername($identifier)) {
      return $user['nsid'];
    }
  }
  return FALSE;
}

/**
 * Do a preg_match to check if the given ID is a valid Flickr user ID.
 *
 * @param String $id
 *   identifier to find an nsid for
 *
 * @return Boolean
 *   TRUE/FALSE
 */
function flickrapi_is_nsid($id) {
  return preg_match('/^\\d+@N\\d+$/', $id) ? TRUE : FALSE;
}

/**
 * Checks if a Flickr account has been already authenticated.
 *
 * @return Boolean
 *   TRUE if the consumer key and consumer secret tokens were found
 */
function _flickrapi_is_authenticated() {
  return variable_get('flickrapi_api_key', '') && variable_get('flickrapi_api_secret', '');
}

/**
 * Clears OAuth token and keys.
 *
 * @return Boolean
 *   TRUE if keys and oauth token were found
 */
function _flickrapi_oauth_clear() {
  $consumer_key = variable_get('flickrapi_api_key');
  $secret = variable_get('flickrapi_api_secret');

  // TODO get rid of this query and use
  // an oauth_common API method when available.
  $csid = db_query("SELECT csid FROM {oauth_common_consumer} WHERE consumer_key = :consumer_key AND secret = :secret", array(
    ':consumer_key' => $consumer_key,
    ':secret' => $secret,
  ))
    ->fetchField();
  if ($csid) {
    DrupalOAuthConsumer::deleteConsumer($csid);
    variable_del('flickrapi_api_key');
    variable_del('flickrapi_api_secret');
    return TRUE;
  }
  else {
    return FALSE;
  }
}

Functions

Name	Description
flickrapi_flush_caches	Implements hook_flush_caches().
flickrapi_form_flickrapi_admin_settings_alter	Implements hook_form_alter().
flickrapi_get_user_nsid	Tries to match an 'identifier' onto a flickr nsid.
flickrapi_is_nsid	Do a preg_match to check if the given ID is a valid Flickr user ID.
flickrapi_libraries_info	Implements hook_libraries_info().
flickrapi_menu	Implements hook_menu().
flickrapi_oauth_token_verify	Verification callback to check the token we received from Flickr
flickrapi_permission	Implements hook_permission().
flickrapi_phpFlickr	Returns the phpFlickr object.
_flickrapi_is_authenticated	Checks if a Flickr account has been already authenticated.
_flickrapi_oauth_clear	Clears OAuth token and keys.
_flickrapi_post	Custom post function to enable OAuth requests.

Classes

Name	Description
FlickrApiOAuthClient	Override DrupalOAuthClient to use its protected get() function