Drupal modules for browsing and managing Fedora-based digital repositories.
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<?php
/**
* @file
* Contains the admin form and callback functions for datastream manipulations.
*/
/**
* Callback to download the given datastream to the users computer.
*
* @param FedoraDatastream $datastream
* The datastream to download.
*/
function islandora_download_datastream(FedoraDatastream $datastream) {
islandora_view_datastream($datastream, TRUE);
}
/**
* Callback function to view or download a datastream.
*
* @note
* This function calls exit().
*
* @param FedoraDatastream $datastream
* The datastream to view/download.
* @param bool $download
* If TRUE the file is download to the user computer for viewing otherwise it
* will attempt to display in the browser natively.
*/
function islandora_view_datastream(FedoraDatastream $datastream, $download = FALSE) {
header_remove('Cache-Control');
header_remove('Expires');
header('Content-type: ' . $datastream->mimetype);
if ($datastream->controlGroup == 'M' || $datastream->controlGroup == 'X') {
header('Content-length: ' . $datastream->size);
}
if ($download) {
// Browsers will not append all extensions.
$mime_detect = new MimeDetect();
$extension = $mime_detect->getExtension($datastream->mimetype);
$filename = $datastream->label . '.' . $extension;
header("Content-Disposition: attachment; filename=\"$filename\"");
}
drupal_page_is_cacheable(FALSE);
// Try not to load the file into PHP memory!
$datastream->getContent('php://output');
exit();
}
/**
* Get the human readable size of the given datastream.
*
* @param FedoraDatastream $datastream
* The datastream to check.
*
* @return string
* A human readable size of the given datastream, or '-' if the size could not
* be determined.
*/
function islandora_datastream_get_human_readable_size(FedoraDatastream $datastream) {
module_load_include('inc', 'islandora', 'includes/utilities');
$size_is_calculatable = $datastream->controlGroup == 'M' || $datastream->controlGroup == 'X';
return $size_is_calculatable ? islandora_convert_bytes_to_human_readable($datastream->size) : '-';
}
/**
* Get either the 'view' or 'download' url for the given datastream if possible.
*
* @param FedoraDatastream $datastream
* The datastream to generated the url to.
*
* @return string
* either the 'view' or 'download' url for the given datastream.
*/
function islandora_datastream_get_url(FedoraDatastream $datastream, $type = 'download') {
return $datastream->controlGroup == 'R' ? $datastream->url : "islandora/object/{$datastream->parent->id}/datastream/{$datastream->id}/$type";
}
/**
* Gets the delete link.
*
* @param FedoraDatastream $datastream
* The datastream to generated the url to.
*/
function islandora_datastream_get_delete_link(FedoraDatastream $datastream) {
$datastreams = module_invoke_all('islandora_undeletable_datastreams', $datastream->parent->models);
$can_delete = !in_array($datastream->id, $datastreams);
return $can_delete ? l(t('delete'), "islandora/object/{$datastream->parent->id}/datastream/{$datastream->id}/delete") : '';
}
/**
* Gets the edit link.
*
* @param FedoraDatastream $datastream
* The datastream to generated the url to.
*/
function islandora_datastream_edit_get_link(FedoraDatastream $datastream) {
$edit_registry = module_invoke_all('islandora_edit_datastream_registry', $datastream->parent, $datastream);
$can_edit = count($edit_registry) > 0 && user_access(FEDORA_METADATA_EDIT);
return $can_edit ? l(t('edit'), "islandora/object/{$datastream->parent->id}/datastream/{$datastream->id}/edit") : '';
}
/**
* Display the edit datastream page.
*
* @param FedoraDatastream $datastream
* The datastream to edit.
*/
function islandora_edit_datastream(FedoraDatastream $datastream) {
$edit_registry = module_invoke_all('islandora_edit_datastream_registry', $datastream->parent, $datastream);
$edit_count = count($edit_registry);
switch ($edit_count) {
case 0:
// No edit implementations.
drupal_set_message(t('There are no edit methods specified for this datastream.'));
drupal_goto("islandora/object/{$object->id}/manage/datastreams");
break;
case 1:
// One registry implementation, go there.
drupal_goto($edit_registry[0]['url']);
break;
default:
// Multiple edit routes registered.
return islandora_edit_datastream_registry_render($edit_registry);
}
}
/**
* Displays links to all the edit datastream registry items.
*
* @param array $edit_registry
* A list of 'islandora_edit_datastream_registry' values.
*/
function islandora_edit_datastream_registry_render(array $edit_registry) {
$markup = '';
foreach ($edit_registry as $edit_route) {
$markup .= l($edit_route['name'], $edit_route['url']) . '<br/>';
}
return array(
'#type' => 'markup',
'#markup' => $markup,
);
}