= 0) && ($bytes < $kilobyte)) {
return $bytes . ' B';
}
elseif (($bytes >= $kilobyte) && ($bytes < $megabyte)) {
return round($bytes / $kilobyte, $precision) . ' KB';
}
elseif (($bytes >= $megabyte) && ($bytes < $gigabyte)) {
return round($bytes / $megabyte, $precision) . ' MB';
}
elseif (($bytes >= $gigabyte) && ($bytes < $terabyte)) {
return round($bytes / $gigabyte, $precision) . ' GB';
}
elseif ($bytes >= $terabyte) {
return round($bytes / $terabyte, $precision) . ' TB';
}
else {
return $bytes . ' B';
}
}
/**
* Creates a label for control group symbols.
*/
function islandora_control_group_to_human_readable($control_group) {
switch ($control_group) {
case 'M':
return 'Managed';
case 'X':
return 'Inline XML';
case 'R':
return 'Redirect';
case 'E':
return 'Externally Referenced';
default:
return $control_group;
}
}
/**
* Checks if the given pid is valid.
*
* @param string $pid
* The object id to check.
*
* @return boolean
* TRUE if valid, FALSE otherwise.
*/
function islandora_is_valid_pid($pid) {
return drupal_strlen(trim($pid)) <= 64 && preg_match('/^([A-Za-z0-9]|-|\.)+:(([A-Za-z0-9])|-|\.|~|_|(%[0-9A-F]{2}))+$/', trim($pid));
}
/**
* Checks if the given datastream id is valid.
*
* @param string $dsid
* The datastream id to check.
*
* @return boolean
* TRUE if valid, FALSE otherwise.
*/
function islandora_is_valid_dsid($dsid) {
return drupal_strlen(trim($dsid)) <= 64 && preg_match('/^[a-zA-Z0-9\_\-\.]+$/', trim($dsid));
}
/**
* Helper function to describe a Fedora repository.
*
* Can be used to check if Fedora is available.
*
* @param string $url
* A url to a Fedora repository, if NULL the default is used.
* @return
* Returns an array describing the repository. Returns FALSE if Fedora is down
* or if the url is incorrect.
*/
function islandora_describe_repository($url = NULL) {
$url = isset($url) ? $url : variable_get('islandora_base_url', 'http://localhost:8080/fedora');
$connection = islandora_get_tuque_connection();
if ($connection) {
try {
$info = $connection->api->a->describeRepository();
return $info;
}
catch (RepositoryException $e) {
return FALSE;
}
}
return FALSE;
}
/**
* Build a list of all the hooks to call.
*
* Concatenates the each pid (escaped) to the hook name, for calling in
* module_invoke_all().
*
* @param string $hook
* A hook to call.
* @param array $pids
* An array of PIDs (probably content models).
*
* @return array
* An array with each PID escaped and concatenated with the base hook name,
* in addition to the base hook name at the end.
*/
function islandora_build_hook_list($hook, $pids = array()) {
$hooks = array();
$pids = array_unique($pids);
foreach ($pids as $pid) {
$hooks[] = islandora_escape_pid_for_function($pid) . '_' . $hook;
}
$hooks[] = $hook;
return $hooks;
}
/**
* Escape a Fedora PID to be valid inside of a PHP function name.
*
* Originally intended to allow inclusion of a PID in a module_invoke_all()
* call.
*/
function islandora_escape_pid_for_function($pid) {
// Apparently, case doesn't matter for function calls in PHP, so let's not
// really worry about changing the case.
return str_replace(
// Any PID characters which are not valid in the name of a PHP function.
array(
':',
'-',
),
'_',
$pid
);
}
/**
* Gets the namespace of the given id.
*
* @param string $id
* Either a PID or namespace to check for accessibility. Any string like those
* below are fine.
*
* @code
* 'islandora',
* 'islandora:',
* 'islandora:1234',
* @endcode
*
* @return string
* The namespace portion of the given string.
*/
function islandora_get_namespace($id) {
$matches = array();
preg_match('/^([^:]*)/', $id, $matches);
return $matches[0];
}
/**
* Checks the given namespace or PID is/has an accessible namespace as defined
* by the "islandora_pids_allowed" variable.
*
* @param string $namespace
* Either a PID or namespace to check for accessibility. Any string like those
* below are fine.
*
* @code
* 'islandora',
* 'islandora:',
* 'islandora:1234',
* @endcode
*
* @return boolean
* TRUE if accessible, FALSE otherwise.
*/
function islandora_namespace_accessible($id) {
if (variable_get('islandora_namespace_restriction_enforced', FALSE)) {
$namespace = islandora_get_namespace($id) . ':';
$allowed_namespaces = explode(" ", variable_get('islandora_pids_allowed', 'default: demo: changeme: islandora: ilives: islandora-book: books: newspapers: '));
return in_array($namespace, $allowed_namespaces);
}
return TRUE;
}
/**
* Gets any objects that the given object has a
* (isMemberOf, isMemberOfCollection) relationship with.
*
* This function gets its info from the RELS-EXT directly rather than through an
* risearch.
*
* @param FedoraObject $object
* The object whose parents will be returned.
*
* @return array
* An array of FedoraObject's that the given object has a
* (isMemberOf, isMemberOfCollection) relationship with.
*/
function islandora_get_parents_from_rels_ext(FedoraObject $object) {
try {
$collections = array_merge(
$object->relationships->get(FEDORA_RELS_EXT_URI, 'isMemberOfCollection'),
$object->relationships->get(FEDORA_RELS_EXT_URI, 'isMemberOf'));
}
catch (RepositoryException $e) {
// @todo some logging would be nice, not sure what this throws.
return array();
}
$collections = array_map(function($o) { return islandora_object_load($o['object']['value']); }, $collections);
return array_filter($collections);
}
/**
* Checks what datastreams the object already has against its required
* datastreams as defined by its content models, and returns their intersection.
*
* @param FedoraObject $object
* The object which models will be used to determine what datastreams it
* should have.
*
* @return array
* The DS-COMPOSITE-MODEL defined datastreams that are required for the given
* object, but not already present.
*/
function islandora_get_missing_datastreams_requirements(FedoraObject $object) {
module_load_include('inc', 'islandora', 'includes/utilities');
$datastreams = islandora_get_datastreams_requirements($object);
foreach ($datastreams as $dsid => $requirements) {
if (isset($object[$dsid])) {
unset($datastreams[$dsid]);
}
}
return $datastreams;
}
/**
* Checks the object's content model's for which datastream are expected to be
* used with this object, as defined by the DS-COMPOSITE-MODEL datastreams.
*
* For duplicate datastreams in the models, the first model defines the
* datastreams attributes regardless of what other models define.
* This should be undefined behavior according to the documentation.
* @see https://wiki.duraspace.org/display/FEDORA34/Fedora+Digital+Object+Model#FedoraDigitalObjectModel-ContentModelObjectCMODEL
*
* @param FedoraObject $object
* The object which models will be used to determine what datastreams it
* should have.
*
* @see islandora_get_required_datastreams_from_content_model() from more
* details on the return value.
*
* @return array
* The DS-COMPOSITE-MODEL defined datastreams that are required for the given
* object.
*/
function islandora_get_datastreams_requirements(FedoraObject $object) {
return islandora_get_datastreams_requirements_from_models($object->models);
}
/**
* Get the list of which datastreams are valid in the given set of models.
*
* @param array $models
* An array of content models PIDs from which to parse the DS-COMPOSITE-MODEL
* stream.
*
* @return array
* An associative array of associative arrays, merged from calls to
* islandora_get_datastreams_requirements_from_content_model().
*/
function islandora_get_datastreams_requirements_from_models(array $models) {
$dsids = array();
foreach ($models as $model_pid) {
$model = islandora_object_load($model_pid);
if (isset($model) && $model) {
$dsids += islandora_get_datastreams_requirements_from_content_model($model);
}
}
// The AUDIT Datastream can not really be added, so it can't really be missing.
unset($dsids['AUDIT']);
return $dsids;
}
/**
* Checks the given content model for which datastreams are required for
* subscribing objects, as defined by it's DS-COMPOSITE-MODEL datastream.
*
* @todo Add support for fetching the schema information.
*
* @param FedoraObject $object
* The content model whose DS-COMPOSITE-MODEL datastream will be used to
* determine what datastreams are required.
*
* @return array
* The DS-COMPOSITE-MODEL defined datastreams that are required for the given
* object.
*
* @code
* array(
* 'DC' => array(
* 'id' => 'DC',
* 'mime' => 'text/xml',
* 'optional' => FALSE,
* )
* )
* @endcode
*/
function islandora_get_datastreams_requirements_from_content_model(FedoraObject $object) {
if (empty($object[DS_COMP_STREAM])) {
return array();
}
$xml = new SimpleXMLElement($object[DS_COMP_STREAM]->content);
foreach ($xml->dsTypeModel as $ds) {
$dsid = (string) $ds['ID'];
$optional = strtolower((string) $ds['optional']);
$mime = array();
foreach ($ds->form as $form) {
$mime[] = (string) $form['MIME'];
}
$dsids[$dsid] = array(
'id' => $dsid,
'mime' => $mime,
'optional' => ($optional == 'true') ? TRUE : FALSE
);
}
return $dsids;
}
/**
* Prepare an ingestable object.
*
* @param string $namespace
* The namespace in which the PID for the new object will be created.
* @param string $label
* An optional label to apply to the object.
* @param array $datastreams
* A array of datastreams to add, where each datastream definition is an
* associative array containing:
* - dsid: The datastream ID.
* - label: An optional label for the datastream.
* - mimetype: A MIMEtype for the datastream; defaults to text/xml.
* - control_group: One of X, M, R and E; defaults to M.
* - datastream_file: A web-accessible path, for which we try to get an
* absolute path using url().
* @param array $content_models
* An array of content model PIDs to which the new object should subscribe.
* @param array $relationships
* An array of relationships, where each relationship is an associative array
* containing:
* - relationship: The predicate for the relationship, from the Fedora
* RELS-EXT namespace.
* - pid: The object for the relationship, to which we are creating the
* relationhsip.
*
* @return NewFedoraObject
* An ingestable NewFedoraObject.
*/
function islandora_prepare_new_object($namespace = NULL, $label = NULL, $datastreams = array(), $content_models = array(), $relationships = array()) {
global $user;
$tuque = islandora_get_tuque_connection();
$object = isset($namespace) ? $tuque->repository->constructObject($namespace) : new NewFedoraObject(NULL, $tuque->repository);
$object->owner = isset($user->name) ? $user->name : $object->owner;
$object->label = isset($label) ? $label : $object->label;
foreach ($content_models as $content_model) {
$object->relationships->add(FEDORA_MODEL_URI, 'hasModel', $content_model);
}
foreach ($relationships as $relationship) {
$object->relationships->add(FEDORA_RELS_EXT_URI, $relationship['relationship'], $relationship['pid']);
}
foreach ($datastreams as $ds) {
$dsid = $ds['dsid'];
$label = isset($ds['label']) ? $ds['label'] : '';
$mimetype = isset($ds['mimetype']) ? $ds['mimetype'] : 'text/xml';
// Default 'Managed'
$control_group = (isset($ds['control_group']) && in_array($ds['control_group'], array('X', 'M', 'R', 'E'))) ? $ds['control_group'] : 'M';
$datastream_file = url($ds['datastream_file'], array('absolute' => TRUE));
$datastream = $object->constructDatastream($dsid, $control_group);
$datastream->label = $label;
$datastream->mimetype = $mimetype;
switch ($control_group) {
case 'M':
$datastream->setContentFromUrl($datastream_file);
break;
case 'X':
$datastream->setContentFromString(file_get_contents($datastream_file));
break;
}
$object->ingestDatastream($datastream);
}
return $object;
}
/**
* Displays the repository is inaccessible message
*
* Use anywhere we want to ensure a consitent error message when the repository
* is not accessible.
*/
function islandora_display_repository_inaccessible_message() {
$text = t('Islandora configuration');
$link = l($text, 'admin/islandora/configure', array('attributes' => array('title' => $text)));
$message = t('Could not connect to the repository. Please check the settings on the !link page.',
array('!link' => $link));
drupal_set_message($message, 'error', FALSE);
}