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+<?php
+
+/**
+ * @file
+ * Hooks provided by the File Entity module.
+ */
+
+/**
+ * Declare that your module provides default file types.
+ *
+ * Your module may already implement this hook for other CTools plugin types.
+ * If so, copy the body of this function into the existing hook.
+ */
+function hook_ctools_plugin_api($owner, $api) {
+ if ($owner == 'file_entity' && $api == 'file_type') {
+ return array('version' => 1);
+ }
+}
+
+/**
+ * Define default file types.
+ *
+ * File types are implemented as CTools exportables, so modules can alter the
+ * defaults via hook_file_default_types_alter(), and the administrator can
+ * save overridden and custom types to the {file_type} database table.
+ *
+ * @return array
+ * An array whose keys are file type names and whose values are objects
+ * representing the file type, with the following key/value pairs:
+ * - api_version: The version of this data.
+ * - type: The file type name.
+ * - label: The human-readable name of the file type.
+ * - description: The description of this file type.
+ * - mimetypes: An array of mimetypes that this file type will map to.
+ */
+function hook_file_default_types() {
+ return array(
+ 'image' => (object) array(
+ 'api_version' => 1,
+ 'type' => 'image',
+ 'label' => t('Image'),
+ 'description' => t("An <em>Image</em> is a two-dimensional picture that has a similar appearance to some subject, usually a physical object or a person."),
+ 'mimetypes' => array(
+ 'image/*',
+ ),
+ ),
+ );
+}
+
+/**
+ * Alter default file types.
+ *
+ * @see hook_file_default_types()
+ */
+function hook_file_default_types_alter(&$types) {
+ $types['image']->mimetypes[] = 'image/svg+xml';
+}
+
+/**
+ * Define file formatters.
+ *
+ * @return array
+ * An array whose keys are file formatter names and whose values are arrays
+ * describing the formatter.
+ *
+ * @todo Document key/value pairs that comprise a formatter.
+ *
+ * @see hook_file_formatter_info_alter()
+ */
+function hook_file_formatter_info() {
+ // @todo Add example.
+}
+
+/**
+ * Perform alterations on file formatters.
+ *
+ * @param array $info
+ * Array of information on file formatters exposed by
+ * hook_file_formatter_info() implementations.
+ */
+function hook_file_formatter_info_alter(&$info) {
+ // @todo Add example.
+}
+
+/**
+ * @todo Add documentation.
+ *
+ * Note: This is not really a hook. The function name is manually specified via
+ * 'view callback' in hook_file_formatter_info(), with this recommended callback
+ * name pattern.
+ */
+function hook_file_formatter_FORMATTER_view($file, $display, $langcode) {
+}
+
+/**
+ * @todo Add documentation.
+ *
+ * Note: This is not really a hook. The function name is manually specified via
+ * 'settings callback' in hook_file_formatter_info(), with this recommended
+ * callback name pattern.
+ */
+function hook_file_formatter_FORMATTER_settings($form, &$form_state, $settings) {
+}
+
+/**
+ * @todo Add documentation.
+ */
+function hook_file_displays_alter($displays, $file, $view_mode) {
+}
+
+/**
+ * @todo Add documentation.
+ */
+function hook_file_view($file, $view_mode, $langcode) {
+}
+
+/**
+ * @todo Add documentation.
+ */
+function hook_file_view_alter($build, $type) {
+}
+
+/**
+ * Add mass file operations.
+ *
+ * This hook enables modules to inject custom operations into the mass
+ * operations dropdown found at admin/content/file, by associating a callback
+ * function with the operation, which is called when the form is submitted. The
+ * callback function receives one initial argument, which is an array of the
+ * checked files.
+ *
+ * @return array
+ * An array of operations. Each operation is an associative array that may
+ * contain the following key-value pairs:
+ * - 'label': Required. The label for the operation, displayed in the dropdown
+ * menu.
+ * - 'callback': Required. The function to call for the operation.
+ * - 'callback arguments': Optional. An array of additional arguments to pass
+ * to the callback function.
+ */
+function hook_file_operations() {
+ $operations = array(
+ 'delete' => array(
+ 'label' => t('Delete selected files'),
+ 'callback' => NULL,
+ ),
+ );
+ return $operations;
+}
+
+/**
+ * Control access to a file.
+ *
+ * Modules may implement this hook if they want to have a say in whether or not
+ * a given user has access to perform a given operation on a file.
+ *
+ * The administrative account (user ID #1) always passes any access check,
+ * so this hook is not called in that case. Users with the "bypass file access"
+ * permission may always view and edit files through the administrative
+ * interface.
+ *
+ * Note that not all modules will want to influence access on all
+ * file types. If your module does not want to actively grant or
+ * block access, return FILE_ENTITY_ACCESS_IGNORE or simply return nothing.
+ * Blindly returning FALSE will break other file access modules.
+ *
+ * @param string $op
+ * The operation to be performed. Possible values:
+ * - "create"
+ * - "delete"
+ * - "update"
+ * - "view"
+ * - "download"
+ * @param object $file
+ * The file on which the operation is to be performed, or, if it does
+ * not yet exist, the type of file to be created.
+ * @param object $account
+ * A user object representing the user for whom the operation is to be
+ * performed.
+ *
+ * @return string|NULL
+ * FILE_ENTITY_ACCESS_ALLOW if the operation is to be allowed;
+ * FILE_ENTITY_ACCESS_DENY if the operation is to be denied;
+ * FILE_ENTITY_ACCESS_IGNORE to not affect this operation at all.
+ *
+ * @ingroup file_entity_access
+ */
+function hook_file_entity_access($op, $file, $account) {
+ $type = is_string($file) ? $file : $file->type;
+
+ if ($op !== 'create' && (REQUEST_TIME - $file->timestamp) < 3600) {
+ // If the file was uploaded in the last hour, deny access to it.
+ return FILE_ENTITY_ACCESS_DENY;
+ }
+
+ // Returning nothing from this function would have the same effect.
+ return FILE_ENTITY_ACCESS_IGNORE;
+}
+
+/**
+ * Control access to listings of files.
+ *
+ * @param object $query
+ * A query object describing the composite parts of a SQL query related to
+ * listing files.
+ *
+ * @see hook_query_TAG_alter()
+ * @ingroup file_entity_access
+ */
+function hook_query_file_entity_access_alter(QueryAlterableInterface $query) {
+ // Only show files that have been uploaded more than an hour ago.
+ $query->condition('timestamp', REQUEST_TIME - 3600, '<=');
+}
+
+/**
+ * Act on a file being displayed as a search result.
+ *
+ * This hook is invoked from file_entity_search_execute(), after file_load()
+ * and file_view() have been called.
+ *
+ * @param object $file
+ * The file being displayed in a search result.
+ *
+ * @return array
+ * Extra information to be displayed with search result. This information
+ * should be presented as an associative array. It will be concatenated
+ * with the file information (filename) in the default search result theming.
+ *
+ * @see template_preprocess_search_result()
+ * @see search-result.tpl.php
+ *
+ * @ingroup file_entity_api_hooks
+ */
+function hook_file_entity_search_result($file) {
+ $file_usage_count = db_query('SELECT count FROM {file_usage} WHERE fid = :fid', array('fid' => $file->fid))->fetchField();
+ return array(
+ 'file_usage_count' => format_plural($file_usage_count, '1 use', '@count uses'),
+ );
+}
+
+/**
+ * Act on a file being indexed for searching.
+ *
+ * This hook is invoked during search indexing, after file_load(), and after
+ * the result of file_view() is added as $file->rendered to the file object.
+ *
+ * @param object $file
+ * The file being indexed.
+ *
+ * @return string
+ * Additional file information to be indexed.
+ *
+ * @ingroup file_entity_api_hooks
+ */
+function hook_file_update_index($file) {
+ $text = '';
+ $uses = db_query('SELECT module, count FROM {file_usage} WHERE fid = :fid', array(':fid' => $file->fid));
+ foreach ($uses as $use) {
+ $text .= '<h2>' . check_plain($use->module) . '</h2>' . check_plain($use->count);
+ }
+ return $text;
+}
+
+/**
+ * Provide additional methods of scoring for core search results for files.
+ *
+ * A file's search score is used to rank it among other files matched by the
+ * search, with the highest-ranked files appearing first in the search listing.
+ *
+ * For example, a module allowing users to vote on files could expose an
+ * option to allow search results' rankings to be influenced by the average
+ * voting score of a file.
+ *
+ * All scoring mechanisms are provided as options to site administrators, and
+ * may be tweaked based on individual sites or disabled altogether if they do
+ * not make sense. Individual scoring mechanisms, if enabled, are assigned a
+ * weight from 1 to 10. The weight represents the factor of magnification of
+ * the ranking mechanism, with higher-weighted ranking mechanisms having more
+ * influence. In order for the weight system to work, each scoring mechanism
+ * must return a value between 0 and 1 for every file. That value is then
+ * multiplied by the administrator-assigned weight for the ranking mechanism,
+ * and then the weighted scores from all ranking mechanisms are added, which
+ * brings about the same result as a weighted average.
+ *
+ * @return array
+ * An associative array of ranking data. The keys should be strings,
+ * corresponding to the internal name of the ranking mechanism, such as
+ * 'recent', or 'usage'. The values should be arrays themselves, with the
+ * following keys available:
+ * - "title": the human readable name of the ranking mechanism. Required.
+ * - "join": part of a query string to join to any additional necessary
+ * table. This is not necessary if the table required is already joined to
+ * by the base query, such as for the {file_managed} table. Other tables
+ * should use the full table name as an alias to avoid naming collisions.
+ * Optional.
+ * - "score": part of a query string to calculate the score for the ranking
+ * mechanism based on values in the database. This does not need to be
+ * wrapped in parentheses, as it will be done automatically; it also does
+ * not need to take the weighted system into account, as it will be done
+ * automatically. It does, however, need to calculate a decimal between
+ * 0 and 1; be careful not to cast the entire score to an integer by
+ * inadvertently introducing a variable argument. Required.
+ * - "arguments": if any arguments are required for the score, they can be
+ * specified in an array here.
+ *
+ * @ingroup file_entity_api_hooks
+ */
+function hook_file_ranking() {
+ // If voting is disabled, we can avoid returning the array, no hard feelings.
+ if (variable_get('vote_file_enabled', TRUE)) {
+ return array(
+ 'vote_average' => array(
+ 'title' => t('Average vote'),
+ // Note that we use i.sid, the search index's search item id, rather
+ // than fm.fid.
+ 'join' => 'LEFT JOIN {vote_file_data} vote_file_data ON vote_file_data.fid = i.sid',
+ // The highest possible score should be 1,
+ // and the lowest possible score, always 0, should be 0.
+ 'score' => 'vote_file_data.average / CAST(%f AS DECIMAL)',
+ // Pass in the highest possible voting score as a decimal argument.
+ 'arguments' => array(variable_get('vote_score_max', 5)),
+ ),
+ );
+ }
+}
+
+/**
+ * Alter file download headers.
+ *
+ * @param array $headers
+ * Array of download headers.
+ * @param object $file
+ * File object.
+ */
+function hook_file_download_headers_alter(array &$headers, $file) {
+ // Instead of being powered by PHP, tell the world this resource was powered
+ // by your custom module!
+ $headers['X-Powered-By'] = 'My Module';
+}
+
+/**
+ * React to a file being downloaded.
+ */
+function hook_file_transfer($uri, array $headers) {
+ // Redirect a download for an S3 file to the actual location.
+ if (file_uri_scheme($uri) == 's3') {
+ $url = file_create_url($uri);
+ drupal_goto($url);
+ }
+}
+
+/**
+ * Decides which file type (bundle) should be assigned to a file entity.
+ *
+ * @param object $file
+ * File object.
+ *
+ * @return array
+ * Array of file type machine names that can be assigned to a given file type.
+ * If there are more proposed file types the one, that was returned the first,
+ * wil be chosen. This can be, however, changed in alter hook.
+ *
+ * @see hook_file_type_alter()
+ */
+function hook_file_type($file) {
+ // Assign all files uploaded by anonymous users to a special file type.
+ if (user_is_anonymous()) {
+ return array('untrusted_files');
+ }
+}
+
+/**
+ * Alters list of file types that can be assigned to a file.
+ *
+ * @param array $types
+ * List of proposed types.
+ * @param object $file
+ * File object.
+ */
+function hook_file_type_alter(&$types, $file) {
+ // Choose a specific, non-first, file type.
+ $types = array($types[4]);
+}
+
+/**
+ * Provides metadata information.
+ *
+ * @todo Add documentation.
+ *
+ * @return array
+ * An array of metadata information.
+ */
+function hook_file_metadata_info() {
+
+}
+
+/**
+ * Alters metadata information.
+ *
+ * @todo Add documentation.
+ *
+ * @return array
+ * an array of metadata information.
+ */
+function hook_file_metadata_info_alter() {
+
+}