Feature: add bulk libray actions

This includes:
- Bulk update libraries to latest versions
- Bulk upgrade content to latest library version
- Bulk export libraries (for importing to another site)
- Bulk import is already a feature using the existing "Upload Libraries"

export_libraries.php

@@ -0,0 +1,163 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Export all libraries script.
+ *
+ * @package   mod_hvp
+ * @author    Rossco Hellmans <rosscohellmans@catalyst-au.net>
+ * @copyright Catalyst IT, 2021
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+require_once('../../config.php');
+require_once($CFG->libdir . '/adminlib.php');
+require_once('locallib.php');
+
+admin_externalpage_setup('h5plibraries');
+
+$COURSE = $SITE;
+
+$interface = mod_hvp\framework::instance('interface');
+$core = mod_hvp\framework::instance('core');
+$exporter = new H5PExport($interface, $core);
+
+$libraries = $core->h5pF->loadLibraries();
+$tmppath = make_request_directory();
+
+$exportedlibraries = [];
+
+// Add libraries to h5p.
+foreach ($libraries as $versions) {
+    try {
+        // We only want to export the latest version.
+        $libraryinfo = array_pop($versions);
+        $library = $interface->loadLibrary(
+            $libraryinfo->machine_name,
+            $libraryinfo->major_version,
+            $libraryinfo->minor_version
+        );
+
+        exportlibrary($library, $exporter, $tmppath, $exportedlibraries);
+    } catch (Exception $e) {
+        throw new moodle_exception('exportlibrarieserror', 'hvp', '', null, $e->getMessage());
+    }
+}
+
+$files = [];
+populatefilelist($tmppath, $files);
+
+// Get path to temporary export target file.
+$tmpfile = tempnam(get_request_storage_directory(), 'hvplibs');
+
+// Create new zip instance.
+$zip = new ZipArchive();
+$zip->open($tmpfile, ZipArchive::CREATE | ZipArchive::OVERWRITE);
+
+// Add all the files from the tmp dir.
+foreach ($files as $file) {
+    // Please note that the zip format has no concept of folders, we must
+    // use forward slashes to separate our directories.
+    if (file_exists(realpath($file->absolutePath))) {
+        $zip->addFile(realpath($file->absolutePath), $file->relativePath);
+    }
+}
+
+// Close zip.
+$zip->close();
+
+$filename = $SITE->shortname . '_site_libraries.h5p';
+try {
+    // Save export.
+    $exporter->h5pC->fs->saveExport($tmpfile, $filename);
+} catch (Exception $e) {
+    throw new moodle_exception('exportlibrarieserror', 'hvp', '', null, $e->getMessage());
+}
+
+// Now send the stored export to user.
+$context = \context_course::instance($COURSE->id);
+$fs = get_file_storage();
+$file = $fs->get_file($context->id, 'mod_hvp', 'exports', 0, '/', $filename);
+send_stored_file($file);
+
+/**
+ * Exports a library.
+ *
+ * @param array $library
+ * @param H5PExport $exporter
+ * @param string $tmppath
+ * @param array $exportedlibraries
+ */
+function exportlibrary($library, $exporter, $tmppath, &$exportedlibraries) {
+    if (in_array($library['libraryId'], $exportedlibraries)) {
+        // Already exported.
+        return;
+    }
+
+    $exportfolder = null;
+
+    // Determine path of export library.
+    if (isset($exporter->h5pC) && isset($exporter->h5pC->h5pD)) {
+
+        // Tries to find library in development folder.
+        $isdevlibrary = $exporter->h5pC->h5pD->getLibrary(
+            $library['machineName'],
+            $library['majorVersion'],
+            $library['minorVersion']
+        );
+
+        if ($isdevlibrary !== null && isset($library['path'])) {
+            $exportfolder = "/" . $library['path'];
+        }
+    }
+
+    // Export library.
+    $exporter->h5pC->fs->exportLibrary($library, $tmppath, $exportfolder);
+    $exportedlibraries[] = $library['libraryId'];
+
+    // Now export the dependancies.
+    $dependencies = [];
+    $exporter->h5pC->findLibraryDependencies($dependencies, $library);
+
+    foreach ($dependencies as $dependency) {
+        exportlibrary($dependency['library'], $exporter, $tmppath, $exportedlibraries);
+    }
+}
+
+/**
+ * Populates an array with a list of files to zip up.
+ *
+ * @param string $dir
+ * @param array $files
+ * @param string $relative
+ */
+function populatefilelist($dir, &$files, $relative = '') {
+    $strip = strlen($dir) + 1;
+    $contents = glob($dir . '/' . '*');
+    if (!empty($contents)) {
+        foreach ($contents as $file) {
+            $rel = $relative . substr($file, $strip);
+            if (is_dir($file)) {
+                populatefilelist($file, $files, $rel . '/');
+            } else {
+                $files[] = (object)[
+                    'absolutePath' => $file,
+                    'relativePath' => $rel,
+                ];
+            }
+        }
+    }
+}