'password', 'view' => 'not_prefilled', ); */ if (isset($form['captcha'])) { $form['captcha']['#fb_registration_field'] = 'captcha'; } // Because profile module may or may not nest fields in fieldsets, we must recurse. foreach (element_children($form) as $key) { _fb_registration_form_alter_fields($form[$key]); } } /** * Implements hook_form_alter(). */ function fb_registration_form_alter(&$form, &$form_state, $form_id) { if (!isset($GLOBALS['_fb'])) { // Facebook app not configured. Nothing to do. return; } if ($GLOBALS['user']->uid) { // No need to alter user add form. return; } if ($form_id == 'user_register_form') { // Replace regular form with fb_registration. $form['#fb_registration'] = TRUE; // Some fields of the registration form require special treatment. _fb_registration_form_alter_fields($form); } if (isset($form['#fb_registration'])) { // Registration has been enabled for this form. $sr = $GLOBALS['_fb']->getSignedRequest(); if ($sr && !empty($sr['registration'])) { $registration = $sr['registration']; // The form has been submitted. We don't need to alter it. Instead we // must submit the original form. // Captcha is a special case, we can't require it during drupal_execute. $form['captcha'] = NULL; if (!isset($form_state['fb_registration_avoid_recursion'])) { $state = array( 'fb_registration_avoid_recursion' => TRUE, 'values' => $registration, 'fb_regisration_values' => $registration, // un-altered values. ); // Drupal expects strings for some values, not the arrays sent by facebook. foreach ($registration as $key => $value) { if (is_array($value) && $value['name']) { $state['values'][$key] = $value['name']; // Simply for drupal form api. } elseif ($key == 'email' && is_string($value)) { // Drupal expects 'mail', not 'email'. if (!isset($state['values']['mail'])) { $state['values']['mail'] = $value; } } } drupal_execute($form_id, $state); // If successful, user will be redirected to another page. } return; } $fb_fields = array(); _fb_registration_extract_fb_fields($fb_fields, $form); $redirect_url = url(request_path(), array('absolute' => TRUE)); $fields = json_encode($fb_fields); if (FALSE) { // Use XFBML. // In testing, I could never get this to work._ $attrs = "fields='" . json_encode($fb_fields) . "' redirect-uri='" . $redirect_url . "'"; $form['fb_registration'] = array( '#type' => 'markup', '#value' => '', ); } else { // Use the iframe markup. $id = $GLOBALS['_fb_app']->id; $url = urlencode($redirect_url); $fields = urlencode($fields); $markup = ""; $form['fb_registration'] = array( '#type' => 'markup', '#value' => $markup, ); } } } function _fb_registration_extract_fb_fields(&$fb_fields, &$form) { foreach (element_children($form) as $key) { $field = NULL; if (isset($form[$key]['#fb_registration_field'])) { if (is_string($form[$key]['#fb_registration_field'])) { // This field is a "built in field". $field = array('name' => $form[$key]['#fb_registration_field']); } elseif (is_array($form[$key]['#fb_registration_field'])) { $field = $form[$key]['#fb_registration_field']; } } else { // #fb_registration_field not specified, fallback to the following // code, which translates some drupal form elements into facebook // fields. if (!isset($form[$key]['#type'])) { _fb_registration_extract_fb_fields($fb_fields, $form[$key]); } elseif ($form[$key]['#type'] == 'fieldset') { _fb_registration_extract_fb_fields($fb_fields, $form[$key]); $form[$key] = NULL; // So the (now empty?) fieldset will not be rendered. } elseif ($form[$key]['#type'] == 'submit') { // We have to use the register button provided by facebook. $form[$key] = NULL; } elseif ($form[$key]['#type'] == 'textfield') { $field = array( 'name' => $key, 'type' => 'text', 'description' => $form[$key]['#title'], ); } elseif ($form[$key]['#type'] == 'textarea') { // Facebook does not offer multi-line text area. Use single line instead. $field = array( 'name' => $key, 'type' => 'text', 'description' => $form[$key]['#title'], ); } elseif ($form[$key]['#type'] == 'checkbox') { $field = array( 'name' => $key, 'type' => 'checkbox', 'description' => $form[$key]['#title'], 'default' => isset($form[$key]['#default_value']) ? $form[$key]['#default_value'] : NULL, ); } elseif ($form[$key]['#type'] == 'select') { $field = array( 'name' => $key, 'type' => 'select', 'description' => $form[$key]['#title'], 'options' => $form[$key]['#options'], 'default' => $form[$key]['#default_value'], ); } // @TODO do something intelligent with unknown element types. } if (count($field)) { // Use the facebook field... $fb_fields[] = $field; // and not the drupal field. $form[$key] = NULL; } } }