/**
* Check if a share arrangement is in place.
*
* @return boolean True if no error is reported
*/
private function checkForShare()
{
$ok = TRUE;
$doSaveResourceLink = TRUE;
$key = $this->resource_link->primary_consumer_key;
$id = $this->resource_link->primary_resource_link_id;
$shareRequest = isset($_POST['custom_share_key']) && !empty($_POST['custom_share_key']);
if ($shareRequest) {
if (!$this->allowSharing) {
$ok = FALSE;
$this->reason = 'Your sharing request has been refused because sharing is not being permitted.';
} else {
// Check if this is a new share key
$share_key = new LTI_Resource_Link_Share_Key($this->resource_link, $_POST['custom_share_key']);
if (!is_null($share_key->primary_consumer_key) && !is_null($share_key->primary_resource_link_id)) {
// Update resource link with sharing primary resource link details
$key = $share_key->primary_consumer_key;
$id = $share_key->primary_resource_link_id;
$ok = $key != $this->consumer->getKey() || $id != $this->resource_link->getId();
if ($ok) {
$this->resource_link->primary_consumer_key = $key;
$this->resource_link->primary_resource_link_id = $id;
$this->resource_link->share_approved = $share_key->auto_approve;
$ok = $this->resource_link->save();
if ($ok) {
$doSaveResourceLink = FALSE;
$this->user->getResourceLink()->primary_consumer_key = $key;
$this->user->getResourceLink()->primary_resource_link_id = $id;
$this->user->getResourceLink()->share_approved = $share_key->auto_approve;
$this->user->getResourceLink()->updated = time();
// Remove share key
$share_key->delete();
} else {
$this->reason = 'An error occurred initialising your share arrangement.';
}
} else {
$this->reason = 'It is not possible to share your resource link with yourself.';
}
}
if ($ok) {
$ok = !is_null($key);
if (!$ok) {
$this->reason = 'You have requested to share a resource link but none is available.';
} else {
$ok = !is_null($this->user->getResourceLink()->share_approved) && $this->user->getResourceLink()->share_approved;
if (!$ok) {
$this->reason = 'Your share request is waiting to be approved.';
}
}
}
}
} else {
// Check no share is in place
$ok = is_null($key);
if (!$ok) {
$this->reason = 'You have not requested to share a resource link but an arrangement is currently in place.';
}
}
// Look up primary resource link
if ($ok && !is_null($key)) {
$consumer = new LTI_Tool_Consumer($key, $this->data_connector);
$ok = !is_null($consumer->created);
if ($ok) {
$resource_link = new LTI_Resource_Link($consumer, $id);
$ok = !is_null($resource_link->created);
}
if ($ok) {
if ($doSaveResourceLink) {
$this->resource_link->save();
}
$this->resource_link = $resource_link;
} else {
$this->reason = 'Unable to load resource link being shared.';
}
}
return $ok;
}
/**
* Class constructor.
*
* @param LTI_Resource_Link $resource_link Resource_Link object
* @param string $id Value of share key (optional, default is null)
*/
public function __construct($resource_link, $id = NULL)
{
parent::__construct($resource_link, $id);
$this->primary_context_id =& $this->primary_resource_link_id;
}