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<?php
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/**
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* @file
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* Functions related to the tracking the file usage of embedded media.
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*/
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/**
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* Implements hook_field_attach_insert().
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*
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* Track file usage for media files included in formatted text. Note that this
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* is heavy-handed, and should be replaced when Drupal's filter system is
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* context-aware.
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*/
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function media_wysiwyg_field_attach_insert($entity_type, $entity) {
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_media_wysiwyg_filter_add_file_usage_from_fields($entity_type, $entity);
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}
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/**
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* Implements hook_field_attach_update().
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*
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* @see media_field_attach_insert().
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*/
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function media_wysiwyg_field_attach_update($entity_type, $entity) {
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_media_wysiwyg_filter_add_file_usage_from_fields($entity_type, $entity);
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}
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/**
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* Add file usage from file references in an entity's text fields.
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*/
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function _media_wysiwyg_filter_add_file_usage_from_fields($entity_type, $entity) {
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// Track the total usage for files from all fields combined.
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$entity_files = media_wysiwyg_entity_field_count_files($entity_type, $entity);
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list($entity_id, $entity_vid, $entity_bundle) = entity_extract_ids($entity_type, $entity);
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// When an entity has revisions and then is saved again NOT as new version the
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// previous revision of the entity has be loaded to get the last known good
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// count of files. The saved data is compared against the last version
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// so that a correct file count can be created for that (the current) version
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// id. This code may assume some things about entities that are only true for
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// node objects. This should be reviewed.
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// @TODO this conditional can probably be condensed
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if (empty($entity->revision) && empty($entity->old_vid) && empty($entity->is_new) && ! empty($entity->original)) {
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$old_files = media_wysiwyg_entity_field_count_files($entity_type, $entity->original);
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foreach ($old_files as $fid => $old_file_count) {
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// Were there more files on the node just prior to saving?
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if (empty($entity_files[$fid])) {
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$entity_files[$fid] = 0;
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}
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if ($old_file_count > $entity_files[$fid]) {
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$deprecate = $old_file_count - $entity_files[$fid];
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// Now deprecate this usage
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$file = file_load($fid);
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if ($file) {
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file_usage_delete($file, 'media', $entity_type, $entity_id, $deprecate);
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}
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// Usage is deleted, nothing more to do with this file
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unset($entity_files[$fid]);
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}
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// There are the same number of files, nothing to do
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elseif ($entity_files[$fid] == $old_file_count) {
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unset($entity_files[$fid]);
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}
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// There are more files now, adjust the difference for the greater number.
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// file_usage incrementing will happen below.
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else {
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// We just need to adjust what the file count will account for the new
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// images that have been added since the increment process below will
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// just add these additional ones in
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$entity_files[$fid] = $entity_files[$fid] - $old_file_count;
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}
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}
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}
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// Each entity revision counts for file usage. If versions are not enabled
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// the file_usage table will have no entries for this because of the delete
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// query above.
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foreach ($entity_files as $fid => $entity_count) {
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if ($file = file_load($fid)) {
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file_usage_add($file, 'media', $entity_type, $entity_id, $entity_count);
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}
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}
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}
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/**
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* Parse file references from an entity's text fields and return them as an array.
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*/
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function media_wysiwyg_filter_parse_from_fields($entity_type, $entity) {
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$file_references = array();
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foreach (media_wysiwyg_filter_fields_with_text_filtering($entity_type, $entity) as $field_name) {
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if ($field_items = field_get_items($entity_type, $entity, $field_name)) {
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foreach ($field_items as $field_item) {
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preg_match_all(MEDIA_WYSIWYG_TOKEN_REGEX, $field_item['value'], $matches);
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foreach ($matches[0] as $tag) {
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$tag = str_replace(array('[[', ']]'), '', $tag);
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$tag_info = drupal_json_decode($tag);
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if (isset($tag_info['fid']) && $tag_info['type'] == 'media') {
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$file_references[] = $tag_info;
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}
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}
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preg_match_all(MEDIA_WYSIWYG_TOKEN_REGEX, $field_item['value'], $matches_alt);
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foreach ($matches_alt[0] as $tag) {
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$tag = urldecode($tag);
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$tag_info = drupal_json_decode($tag);
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if (isset($tag_info['fid']) && $tag_info['type'] == 'media') {
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$file_references[] = $tag_info;
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}
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}
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}
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}
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}
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return $file_references;
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}
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/**
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* Utility function to get the file count in this entity
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*
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* @param type $entity
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* @param type $entity_type
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* @return int
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*/
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function media_wysiwyg_entity_field_count_files($entity_type, $entity) {
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$entity_files = array();
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foreach (media_wysiwyg_filter_parse_from_fields($entity_type, $entity) as $file_reference) {
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if (empty($entity_files[$file_reference['fid']])) {
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$entity_files[$file_reference['fid']] = 1;
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}
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else {
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$entity_files[$file_reference['fid']]++;
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}
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}
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return $entity_files;
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}
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/**
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* Implements hook_entity_delete().
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*/
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function media_wysiwyg_entity_delete($entity, $type) {
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list($entity_id) = entity_extract_ids($type, $entity);
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db_delete('file_usage')
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->condition('module', 'media')
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->condition('type', $type)
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->condition('id', $entity_id)
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->execute();
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}
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/**
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* Implements hook_field_attach_delete_revision().
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*
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* @param type $entity_type
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* @param type $entity
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*/
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function media_wysiwyg_field_attach_delete_revision($entity_type, $entity) {
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list($entity_id) = entity_extract_ids($entity_type, $entity);
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$files = media_wysiwyg_entity_field_count_files($entity_type, $entity);
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foreach ($files as $fid => $count) {
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if ($file = file_load($fid)) {
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file_usage_delete($file, 'media', $entity_type , $entity_id, $count);
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}
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}
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}
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/**
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* Implements hook_entity_dependencies().
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*/
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function media_wysiwyg_entity_dependencies($entity, $entity_type) {
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// Go through all the entity's text fields and add a dependency on any files
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// that are referenced there.
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$dependencies = array();
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foreach (media_wysiwyg_filter_parse_from_fields($entity_type, $entity) as $file_reference) {
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$dependencies[] = array('type' => 'file', 'id' => $file_reference['fid']);
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}
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return $dependencies;
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}
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