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<?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/>.

/**
 * Unit tests for the cron.
 *
 * @package   core
 * @category  test
 * @copyright 2013 Tim Gusak <tim.gusak@remote-learner.net>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

global $CFG;
require_once($CFG->libdir.'/cronlib.php');

class cronlib_testcase extends basic_testcase {

/**
     * Data provider for cron_delete_from_temp.
     *
     * @return array Provider data
     */
    public function cron_delete_from_temp_provider() {
        global $CFG;

$tmpdir = realpath($CFG->tempdir);
        // This is a relative time.
        $time = 0;

// Relative time stamps. Did you know data providers get executed during phpunit init?
        $lastweekstime = -($CFG->tempdatafoldercleanup * 3600); // This must match file_temp_cleanup_task.
        $beforelastweekstime = $lastweekstime - 3600 - 1; // At least 1h and 1s diff (make it DST immune).
        $afterlastweekstime = $lastweekstime + 3600 + 1; // At least 1h and 1s diff (make it DST immune).

$nodes = array();
        // Really old directory to remove.
        $nodes[] = $this->generate_test_path('/dir1/dir1_1/dir1_1_1/dir1_1_1_1/', true, $lastweekstime * 52, false);

// New Directory to keep.
        $nodes[] = $this->generate_test_path('/dir1/dir1_2/', true, $time, true);

// Directory a little less than 1 week old, keep.
        $nodes[] = $this->generate_test_path('/dir2/', true, $afterlastweekstime, true);

// Directory older than 1 week old, remove.
        $nodes[] = $this->generate_test_path('/dir3/', true, $beforelastweekstime, false);

// File older than 1 week old, remove.
        $nodes[] = $this->generate_test_path('/dir1/dir1_1/dir1_1_1/file1_1_1_1', false, $beforelastweekstime, false);

// New File to keep.
        $nodes[] = $this->generate_test_path('/dir1/dir1_1/dir1_1_1/file1_1_1_2', false, $time, true);

// File older than 1 week old, remove.
        $nodes[] = $this->generate_test_path('/dir1/dir1_2/file1_1_2_1', false, $beforelastweekstime, false);

// New file to keep.
        $nodes[] = $this->generate_test_path('/dir1/dir1_2/file1_1_2_2', false, $time, true);

// New file to keep.
        $nodes[] = $this->generate_test_path('/file1', false, $time, true);

// File older than 1 week, keep.
        $nodes[] = $this->generate_test_path('/file2', false, $beforelastweekstime, false);

// Directory older than 1 week to keep.
        // Note: Since this directory contains a directory that contains a file that is also older than a week
        // the directory won't be deleted since it's mtime will be updated when the file is deleted.

$nodes[] = $this->generate_test_path('/dir4/dir4_1', true, $beforelastweekstime, true);

$nodes[] = $this->generate_test_path('/dir4/dir4_1/dir4_1_1/', true, $beforelastweekstime, true);

// File older than 1 week to remove.
        $nodes[] = $this->generate_test_path('/dir4/dir4_1/dir4_1_1/file4_1_1_1', false, $beforelastweekstime, false);

$expectednodes = array();
        foreach ($nodes as $node) {
            if ($node->keep) {
                $path = $tmpdir;
                $pelements = preg_split('/\//', $node->path);
                foreach ($pelements as $pelement) {
                    if ($pelement === '') {
                        continue;
                    }
                    $path .= DIRECTORY_SEPARATOR . $pelement;
                    if (!in_array($path, $expectednodes)) {
                        $expectednodes[] = $path;
                    }
                }
            }
        }
        sort($expectednodes);

$data = array(
                array(
                    $nodes,
                    $expectednodes
                ),
                array(
                    array(),
                    array()
                )
        );

return $data;
    }

/**
     * Function to populate node array.
     *
     * @param string $path Path of directory or file
     * @param bool $isdir Is the node a directory
     * @param int $time modified time of the node in epoch
     * @param bool $keep Should the node exist after the delete function has run
     */
    private function generate_test_path($path, $isdir = false, $time = 0, $keep = false) {
        $node = new stdClass();
        $node->path = $path;
        $node->isdir = $isdir;
        $node->time = $time;
        $node->keep = $keep;
        return $node;
    }
    /**
     * Test removing files and directories from tempdir.
     *
     * @dataProvider cron_delete_from_temp_provider
     * @param array $nodes List of files and directories
     * @param array $expected The expected results
     */
    public function test_cron_delete_from_temp($nodes, $expected) {
        global $CFG;

$tmpdir = realpath($CFG->tempdir);

foreach ($nodes as $data) {
            if ($data->isdir) {
                mkdir($tmpdir.$data->path, $CFG->directorypermissions, true);
            }
        }
        // We need to iterate through again since adding a file to a directory will
        // update the modified time of the directory.
        foreach ($nodes as $data) {
            touch($tmpdir.$data->path, time() + $data->time);
        }

$task = new \core\task\file_temp_cleanup_task();
        $task->execute();

$dir = new RecursiveDirectoryIterator($tmpdir);
        $iter = new RecursiveIteratorIterator($dir, RecursiveIteratorIterator::CHILD_FIRST);

$actual = array();
        for ($iter->rewind(); $iter->valid(); $iter->next()) {
            $isvalid = true;
            $isvalid = $isvalid && !$iter->isDot();
            // Remove the default $CFG->tempdir/backup directory and $CFG->tempdir/.htaccess file from this comparison.
            $isvalid = $isvalid && !($iter->isDir() && ($iter->getRealpath() === $tmpdir . DIRECTORY_SEPARATOR . 'backup'));
            $isvalid = $isvalid && !($iter->isFile() && ($iter->getRealpath() === $tmpdir . DIRECTORY_SEPARATOR . '.htaccess'));
            if ($isvalid) {
                $actual[] = $iter->getRealPath();
            }
        }

// Sort results to guarantee actual order.
        sort($actual);

$this->assertEquals($expected, $actual);
    }
}