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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/>.

namespace core;

/**
 * Unit tests for setuplib.php
 *
 * @package   core
 * @category  test
 * @copyright 2012 The Open University
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class setuplib_test extends \advanced_testcase {

/**
     * Test get_docs_url_standard in the normal case when we should link to Moodle docs.
     */
    public function test_get_docs_url_standard() {
        global $CFG;
        if (empty($CFG->docroot)) {
            $docroot = 'http://docs.moodle.org/';
        } else {
            $docroot = $CFG->docroot;
        }
        $this->assertMatchesRegularExpression(
            '~^' . preg_quote($docroot, '') . '/\d{2,3}/' . current_language() . '/course/editing$~',
            get_docs_url('course/editing')
        );
    }

/**
     * Test get_docs_url_standard in the special case of an absolute HTTP URL.
     */
    public function test_get_docs_url_http() {
        $url = 'http://moodle.org/';
        $this->assertEquals($url, get_docs_url($url));
    }

/**
     * Test get_docs_url_standard in the special case of an absolute HTTPS URL.
     */
    public function test_get_docs_url_https() {
        $url = 'https://moodle.org/';
        $this->assertEquals($url, get_docs_url($url));
    }

/**
     * Test get_docs_url_standard in the special case of a link relative to wwwroot.
     */
    public function test_get_docs_url_wwwroot() {
        global $CFG;
        $this->assertSame($CFG->wwwroot . '/lib/tests/setuplib_test.php',
                get_docs_url('%%WWWROOT%%/lib/tests/setuplib_test.php'));
    }

/**
     * Test if get_exception_info() removes file system paths.
     */
    public function test_exception_info_removes_serverpaths() {
        global $CFG;

// This doesn't test them all possible ones, but these are set for unit tests.
        $cfgnames = array('dataroot', 'dirroot', 'tempdir', 'backuptempdir', 'cachedir', 'localcachedir');

$fixture  = '';
        $expected = '';
        foreach ($cfgnames as $cfgname) {
            if (!empty($CFG->$cfgname)) {
                $fixture  .= $CFG->$cfgname.' ';
                $expected .= "[$cfgname] ";
            }
        }
        $exception     = new \moodle_exception('generalexceptionmessage', 'error', '', $fixture, $fixture);
        $exceptioninfo = get_exception_info($exception);

$this->assertStringContainsString($expected, $exceptioninfo->message,
            'Exception message does not contain system paths');
        $this->assertStringContainsString($expected, $exceptioninfo->debuginfo,
            'Exception debug info does not contain system paths');
    }

public function test_localcachedir() {
        global $CFG;

$this->resetAfterTest(true);

// Test default location - can not be modified in phpunit tests because we override everything in config.php.
        $this->assertSame("$CFG->dataroot/localcache", $CFG->localcachedir);

$this->setCurrentTimeStart();
        $timestampfile = "$CFG->localcachedir/.lastpurged";

// Delete existing localcache directory, as this is testing first call
        // to make_localcache_directory.
        $this->assertTrue(remove_dir($CFG->localcachedir));
        $dir = make_localcache_directory('');
        $this->assertSame($CFG->localcachedir, $dir);
        $this->assertFileDoesNotExist("$CFG->localcachedir/.htaccess");
        $this->assertFileExists($timestampfile);
        $this->assertTimeCurrent(filemtime($timestampfile));

$dir = make_localcache_directory('test/test', false);
        $this->assertSame("$CFG->localcachedir/test/test", $dir);

// Test custom location.
        $CFG->localcachedir = "$CFG->dataroot/testlocalcache";
        $this->setCurrentTimeStart();
        $timestampfile = "$CFG->localcachedir/.lastpurged";
        $this->assertFileDoesNotExist($timestampfile);

$dir = make_localcache_directory('', false);
        $this->assertSame($CFG->localcachedir, $dir);
        $this->assertFileExists("$CFG->localcachedir/.htaccess");
        $this->assertFileExists($timestampfile);
        $this->assertTimeCurrent(filemtime($timestampfile));

$dir = make_localcache_directory('test', false);
        $this->assertSame("$CFG->localcachedir/test", $dir);

$prevtime = filemtime($timestampfile);
        $dir = make_localcache_directory('pokus', false);
        $this->assertSame("$CFG->localcachedir/pokus", $dir);
        $this->assertSame($prevtime, filemtime($timestampfile));

// Test purging.
        $testfile = "$CFG->localcachedir/test/test.txt";
        $this->assertTrue(touch($testfile));

$now = $this->setCurrentTimeStart();
        set_config('localcachedirpurged', $now - 2);
        purge_all_caches();
        $this->assertFileDoesNotExist($testfile);
        $this->assertFileDoesNotExist(dirname($testfile));
        $this->assertFileExists($timestampfile);
        $this->assertTimeCurrent(filemtime($timestampfile));
        $this->assertTimeCurrent($CFG->localcachedirpurged);

// Simulates purge_all_caches() on another server node.
        make_localcache_directory('test', false);
        $this->assertTrue(touch($testfile));
        set_config('localcachedirpurged', $now - 1);
        $this->assertTrue(touch($timestampfile, $now - 2));
        clearstatcache();
        $this->assertSame($now - 2, filemtime($timestampfile));

$this->setCurrentTimeStart();
        $dir = make_localcache_directory('', false);
        $this->assertSame("$CFG->localcachedir", $dir);
        $this->assertFileDoesNotExist($testfile);
        $this->assertFileDoesNotExist(dirname($testfile));
        $this->assertFileExists($timestampfile);
        $this->assertTimeCurrent(filemtime($timestampfile));
    }

public function test_make_unique_directory_basedir_is_file() {
        global $CFG;

// Start with a file instead of a directory.
        $base = $CFG->tempdir . DIRECTORY_SEPARATOR . md5(microtime(true) + rand());
        touch($base);

// First the false test.
        $this->assertFalse(make_unique_writable_directory($base, false));

// Now check for exception.
        $this->expectException('invalid_dataroot_permissions');
        $this->expectExceptionMessage($base . ' is not writable. Unable to create a unique directory within it.');
        make_unique_writable_directory($base);

unlink($base);
    }

public function test_make_unique_directory() {
        global $CFG;

// Create directories should be both directories, and writable.
        $firstdir = make_unique_writable_directory($CFG->tempdir);
        $this->assertTrue(is_dir($firstdir));
        $this->assertTrue(is_writable($firstdir));

$seconddir = make_unique_writable_directory($CFG->tempdir);
        $this->assertTrue(is_dir($seconddir));
        $this->assertTrue(is_writable($seconddir));

// Directories should be different each iteration.
        $this->assertNotEquals($firstdir, $seconddir);
    }

public function test_get_request_storage_directory() {
        $this->resetAfterTest(true);

// Making a call to get_request_storage_directory should always give the same result.
        $firstdir = get_request_storage_directory();
        $seconddir = get_request_storage_directory();
        $this->assertTrue(is_dir($firstdir));
        $this->assertEquals($firstdir, $seconddir);

// Removing the directory and calling get_request_storage_directory() again should cause a new directory to be created.
        remove_dir($firstdir);
        $this->assertFalse(file_exists($firstdir));
        $this->assertFalse(is_dir($firstdir));

$thirddir = get_request_storage_directory();
        $this->assertTrue(is_dir($thirddir));
        $this->assertNotEquals($firstdir, $thirddir);

// Removing it and replacing it with a file should cause it to be regenerated again.
        remove_dir($thirddir);
        $this->assertFalse(file_exists($thirddir));
        $this->assertFalse(is_dir($thirddir));
        touch($thirddir);
        $this->assertTrue(file_exists($thirddir));
        $this->assertFalse(is_dir($thirddir));

$fourthdir = get_request_storage_directory();
        $this->assertTrue(is_dir($fourthdir));
        $this->assertNotEquals($thirddir, $fourthdir);

$now = $this->setCurrentTimeStart();
        set_config('localcachedirpurged', $now - 2);
        purge_all_caches();
        $this->assertTrue(is_dir($fourthdir));
    }

public function test_make_request_directory() {
        // Every request directory should be unique.
        $firstdir   = make_request_directory();
        $seconddir  = make_request_directory();
        $thirddir   = make_request_directory();
        $fourthdir  = make_request_directory();

$this->assertNotEquals($firstdir,   $seconddir);
        $this->assertNotEquals($firstdir,   $thirddir);
        $this->assertNotEquals($firstdir,   $fourthdir);
        $this->assertNotEquals($seconddir,  $thirddir);
        $this->assertNotEquals($seconddir,  $fourthdir);
        $this->assertNotEquals($thirddir,   $fourthdir);

// They should also all be within the request storage directory.
        $requestdir = get_request_storage_directory();
        $this->assertEquals(0, strpos($firstdir,    $requestdir));
        $this->assertEquals(0, strpos($seconddir,   $requestdir));
        $this->assertEquals(0, strpos($thirddir,    $requestdir));
        $this->assertEquals(0, strpos($fourthdir,   $requestdir));

// Removing the requestdir should mean that new request directories are still created successfully.
        remove_dir($requestdir);
        $this->assertFalse(file_exists($requestdir));
        $this->assertFalse(is_dir($requestdir));

$fifthdir   = make_request_directory();
        $this->assertNotEquals($firstdir,   $fifthdir);
        $this->assertNotEquals($seconddir,  $fifthdir);
        $this->assertNotEquals($thirddir,   $fifthdir);
        $this->assertNotEquals($fourthdir,  $fifthdir);
        $this->assertTrue(is_dir($fifthdir));
        $this->assertFalse(strpos($fifthdir, $requestdir));

// And it should be within the new request directory.
        $newrequestdir = get_request_storage_directory();
        $this->assertEquals(0, strpos($fifthdir, $newrequestdir));
    }

public function test_merge_query_params() {
        $original = array(
            'id' => '1',
            'course' => '2',
            'action' => 'delete',
            'grade' => array(
                0 => 'a',
                1 => 'b',
                2 => 'c',
            ),
            'items' => array(
                'a' => 'aa',
                'b' => 'bb',
            ),
            'mix' => array(
                0 => '2',
            ),
            'numerical' => array(
                '2' => array('a' => 'b'),
                '1' => '2',
            ),
        );

$chunk = array(
            'numerical' => array(
                '0' => 'z',
                '2' => array('d' => 'e'),
            ),
            'action' => 'create',
            'next' => '2',
            'grade' => array(
                0 => 'e',
                1 => 'f',
                2 => 'g',
            ),
            'mix' => 'mix',
        );

$expected = array(
            'id' => '1',
            'course' => '2',
            'action' => 'create',
            'grade' => array(
                0 => 'a',
                1 => 'b',
                2 => 'c',
                3 => 'e',
                4 => 'f',
                5 => 'g',
            ),
            'items' => array(
                'a' => 'aa',
                'b' => 'bb',
            ),
            'mix' => 'mix',
            'numerical' => array(
                '2' => array('a' => 'b', 'd' => 'e'),
                '1' => '2',
                '0' => 'z',
            ),
            'next' => '2',
        );

$array = $original;
        merge_query_params($array, $chunk);

$this->assertSame($expected, $array);
        $this->assertNotSame($original, $array);

$query = "id=1&course=2&action=create&grade%5B%5D=a&grade%5B%5D=b&grade%5B%5D=c&grade%5B%5D=e&grade%5B%5D=f&grade%5B%5D=g&items%5Ba%5D=aa&items%5Bb%5D=bb&mix=mix&numerical%5B2%5D%5Ba%5D=b&numerical%5B2%5D%5Bd%5D=e&numerical%5B1%5D=2&numerical%5B0%5D=z&next=2";
        $decoded = array();
        parse_str($query, $decoded);
        $this->assertSame($expected, $decoded);

// Prove that we cannot use array_merge_recursive() instead.
        $this->assertNotSame($expected, array_merge_recursive($original, $chunk));
    }

/**
     * Test the link processed by get_exception_info().
     */
    public function test_get_exception_info_link() {
        global $CFG, $SESSION;

$httpswwwroot = str_replace('http:', 'https:', $CFG->wwwroot);

// Simple local URL.
        $url = $CFG->wwwroot . '/something/here?really=yes';
        $exception = new \moodle_exception('none', 'error', $url);
        $infos = $this->get_exception_info($exception);
        $this->assertSame($url, $infos->link);

// Relative local URL.
        $url = '/something/here?really=yes';
        $exception = new \moodle_exception('none', 'error', $url);
        $infos = $this->get_exception_info($exception);
        $this->assertSame($CFG->wwwroot . '/', $infos->link);

// HTTPS URL when login HTTPS is not enabled (default) and site is HTTP.
        $CFG->wwwroot = str_replace('https:', 'http:', $CFG->wwwroot);
        $url = $httpswwwroot . '/something/here?really=yes';
        $exception = new \moodle_exception('none', 'error', $url);
        $infos = $this->get_exception_info($exception);
        $this->assertSame($CFG->wwwroot . '/', $infos->link);

// HTTPS URL when login HTTPS is not enabled and site is HTTPS.
        $CFG->wwwroot = str_replace('http:', 'https:', $CFG->wwwroot);
        $url = $httpswwwroot . '/something/here?really=yes';
        $exception = new \moodle_exception('none', 'error', $url);
        $infos = $this->get_exception_info($exception);
        $this->assertSame($url, $infos->link);

// External HTTP URL.
        $url = 'http://moodle.org/something/here?really=yes';
        $exception = new \moodle_exception('none', 'error', $url);
        $infos = $this->get_exception_info($exception);
        $this->assertSame($CFG->wwwroot . '/', $infos->link);

// External HTTPS URL.
        $url = 'https://moodle.org/something/here?really=yes';
        $exception = new \moodle_exception('none', 'error', $url);
        $infos = $this->get_exception_info($exception);
        $this->assertSame($CFG->wwwroot . '/', $infos->link);

// External URL containing local URL.
        $url = 'http://moodle.org/something/here?' . $CFG->wwwroot;
        $exception = new \moodle_exception('none', 'error', $url);
        $infos = $this->get_exception_info($exception);
        $this->assertSame($CFG->wwwroot . '/', $infos->link);
    }

/**
     * Wrapper to call {@link get_exception_info()}.
     *
     * @param  Exception $ex An exception.
     * @return stdClass of information.
     */
    public function get_exception_info($ex) {
        try {
            throw $ex;
        } catch (\moodle_exception $e) {
            return get_exception_info($e);
        }
    }

/**
     * Data provider for test_get_real_size().
     *
     * @return array An array of arrays contain test data
     */
    public function data_for_test_get_real_size() {
        return array(
            array('8KB',    8192),
            array('8Kb',    8192),
            array('8K',     8192),
            array('8k',     8192),
            array('50MB',   52428800),
            array('50Mb',   52428800),
            array('50M',    52428800),
            array('50m',    52428800),
            array('8GB',    8589934592),
            array('8Gb',    8589934592),
            array('8G',     8589934592),
            array('7T',     7696581394432),
            array('7TB',    7696581394432),
            array('7Tb',    7696581394432),
            array('6P',     6755399441055744),
            array('6PB',    6755399441055744),
            array('6Pb',    6755399441055744),
        );
    }

/**
     * Test the get_real_size() function.
     *
     * @dataProvider data_for_test_get_real_size
     *
     * @param string $input the input for get_real_size()
     * @param int $expectedbytes the expected bytes
     */
    public function test_get_real_size($input, $expectedbytes) {
        $this->assertEquals($expectedbytes, get_real_size($input));
    }

/**
     * Validate the given V4 UUID.
     *
     * @param string $value The candidate V4 UUID
     * @return bool True if valid; otherwise, false.
     */
    protected static function is_valid_uuid_v4($value) {
        // Version 4 UUIDs have the form xxxxxxxx-xxxx-4xxx-Yxxx-xxxxxxxxxxxx
        // where x is any hexadecimal digit and Y is one of 8, 9, aA, or bB.
        // First, the size is 36 (32 + 4 dashes).
        if (strlen($value) != 36) {
            return false;
        }
        // Finally, check the format.
        $uuidv4pattern = '/^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i';
        return (preg_match($uuidv4pattern, $value) === 1);
    }

/**
     * Test the \core\uuid::generate_uuid_via_pecl_uuid_extension() function.
     */
    public function test_core_uuid_generate_uuid_via_pecl_uuid_extension() {
        if (!extension_loaded('uuid')) {
            $this->markTestSkipped("PHP 'uuid' extension not loaded.");
        }
        if (!function_exists('uuid_time')) {
            $this->markTestSkipped("PHP PECL 'uuid' extension not loaded.");
        }

// The \core\uuid::generate_uuid_via_pecl_uuid_extension static method is protected. Use Reflection to call the method.
        $method = new \ReflectionMethod('\core\uuid', 'generate_uuid_via_pecl_uuid_extension');
        $uuid = $method->invoke(null);
        $this->assertTrue(self::is_valid_uuid_v4($uuid), "Invalid v4 uuid: '$uuid'");
    }

/**
     * Test the \core\uuid::generate_uuid_via_random_bytes() function.
     */
    public function test_core_uuid_generate_uuid_via_random_bytes() {
        try {
            random_bytes(1);
        } catch (\Exception $e) {
            $this->markTestSkipped('No source of entropy for random_bytes. ' . $e->getMessage());
        }

// The \core\uuid::generate_uuid_via_random_bytes static method is protected. Use Reflection to call the method.
        $method = new \ReflectionMethod('\core\uuid', 'generate_uuid_via_random_bytes');
        $uuid = $method->invoke(null);
        $this->assertTrue(self::is_valid_uuid_v4($uuid), "Invalid v4 uuid: '$uuid'");
    }

/**
     * Test the \core\uuid::generate() function.
     */
    public function test_core_uuid_generate() {
        $uuid = \core\uuid::generate();
        $this->assertTrue(self::is_valid_uuid_v4($uuid), "Invalid v4 UUID: '$uuid'");
    }

/**
     * Test require_phpunit_isolation in a test which is not isolated.
     *
     * @covers ::require_phpunit_isolation
     */
    public function test_require_phpunit_isolation(): void {
        // A unit test which is not isolated will throw a coding_exception when the function is called.
        $this->expectException('coding_exception');
        require_phpunit_isolation();
    }

/**
     * Test require_phpunit_isolation in a test which is isolated.
     *
     * @covers ::require_phpunit_isolation
     * @runInSeparateProcess
     */
    public function test_require_phpunit_isolation_isolated(): void {
        $this->expectNotToPerformAssertions();
        require_phpunit_isolation();
    }
}

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