PHP curl::get_info方法代码示例

 /**
  * @param mixed $path
  * @param string $search
  * @return array
  */
 public function get_listing($path = '', $page = '')
 {
     global $CFG, $OUTPUT;
     $ret = array();
     $curl = new curl();
     $msg = $curl->head($this->file_url);
     $info = $curl->get_info();
     if ($info['http_code'] != 200) {
         $ret['e'] = $msg;
     } else {
         $ret['list'] = array();
         $ret['nosearch'] = true;
         $ret['nologin'] = true;
         $filename = $this->guess_filename($info['url'], $info['content_type']);
         if (strstr($info['content_type'], 'text/html') || empty($info['content_type'])) {
             // analysis this web page, general file list
             $ret['list'] = array();
             $content = $curl->get($info['url']);
             $this->analyse_page($info['url'], $content, $ret);
         } else {
             // download this file
             $ret['list'][] = array('title' => $filename, 'source' => $this->file_url, 'thumbnail' => $OUTPUT->old_icon_url(file_extension_icon($filename, 32)));
         }
     }
     return $ret;
 }

 /**
  * Calls the pluginfo.php service and returns the raw response
  *
  * @param string $component
  * @param string $version
  * @return string
  */
 protected function call_service($component, $version)
 {
     global $CFG;
     require_once $CFG->libdir . '/filelib.php';
     $curl = new curl(array('proxy' => true));
     $response = $curl->get($this->service_request_url(), $this->service_request_params($component, $version), $this->service_request_options());
     $curlerrno = $curl->get_errno();
     $curlinfo = $curl->get_info();
     if (!empty($curlerrno)) {
         throw new tool_installaddon_pluginfo_exception('err_curl_exec', array('url' => $curlinfo['url'], 'errno' => $curlerrno, 'error' => $curl->error));
     } else {
         if ($curlinfo['http_code'] != 200) {
             throw new tool_installaddon_pluginfo_exception('err_curl_http_code', array('url' => $curlinfo['url'], 'http_code' => $curlinfo['http_code']));
         } else {
             if (isset($curlinfo['ssl_verify_result']) and $curlinfo['ssl_verify_result'] != 0) {
                 throw new tool_installaddon_pluginfo_exception('err_curl_ssl_verify', array('url' => $curlinfo['url'], 'ssl_verify_result' => $curlinfo['ssl_verify_result']));
             }
         }
     }
     return $response;
 }

/**
 * Fetches content of file from Internet (using proxy if defined). Uses cURL extension if present.
 * Due to security concerns only downloads from http(s) sources are supported.
 *
 * @category files
 * @param string $url file url starting with http(s)://
 * @param array $headers http headers, null if none. If set, should be an
 *   associative array of header name => value pairs.
 * @param array $postdata array means use POST request with given parameters
 * @param bool $fullresponse return headers, responses, etc in a similar way snoopy does
 *   (if false, just returns content)
 * @param int $timeout timeout for complete download process including all file transfer
 *   (default 5 minutes)
 * @param int $connecttimeout timeout for connection to server; this is the timeout that
 *   usually happens if the remote server is completely down (default 20 seconds);
 *   may not work when using proxy
 * @param bool $skipcertverify If true, the peer's SSL certificate will not be checked.
 *   Only use this when already in a trusted location.
 * @param string $tofile store the downloaded content to file instead of returning it.
 * @param bool $calctimeout false by default, true enables an extra head request to try and determine
 *   filesize and appropriately larger timeout based on $CFG->curltimeoutkbitrate
 * @return stdClass|string|bool stdClass object if $fullresponse is true, false if request failed, true
 *   if file downloaded into $tofile successfully or the file content as a string.
 */
function download_file_content($url, $headers = null, $postdata = null, $fullresponse = false, $timeout = 300, $connecttimeout = 20, $skipcertverify = false, $tofile = NULL, $calctimeout = false)
{
    global $CFG;
    // Only http and https links supported.
    if (!preg_match('|^https?://|i', $url)) {
        if ($fullresponse) {
            $response = new stdClass();
            $response->status = 0;
            $response->headers = array();
            $response->response_code = 'Invalid protocol specified in url';
            $response->results = '';
            $response->error = 'Invalid protocol specified in url';
            return $response;
        } else {
            return false;
        }
    }
    $options = array();
    $headers2 = array();
    if (is_array($headers)) {
        foreach ($headers as $key => $value) {
            if (is_numeric($key)) {
                $headers2[] = $value;
            } else {
                $headers2[] = "{$key}: {$value}";
            }
        }
    }
    if ($skipcertverify) {
        $options['CURLOPT_SSL_VERIFYPEER'] = false;
    } else {
        $options['CURLOPT_SSL_VERIFYPEER'] = true;
    }
    $options['CURLOPT_CONNECTTIMEOUT'] = $connecttimeout;
    $options['CURLOPT_FOLLOWLOCATION'] = 1;
    $options['CURLOPT_MAXREDIRS'] = 5;
    // Use POST if requested.
    if (is_array($postdata)) {
        $postdata = format_postdata_for_curlcall($postdata);
    } else {
        if (empty($postdata)) {
            $postdata = null;
        }
    }
    // Optionally attempt to get more correct timeout by fetching the file size.
    if (!isset($CFG->curltimeoutkbitrate)) {
        // Use very slow rate of 56kbps as a timeout speed when not set.
        $bitrate = 56;
    } else {
        $bitrate = $CFG->curltimeoutkbitrate;
    }
    if ($calctimeout and !isset($postdata)) {
        $curl = new curl();
        $curl->setHeader($headers2);
        $curl->head($url, $postdata, $options);
        $info = $curl->get_info();
        $error_no = $curl->get_errno();
        if (!$error_no && $info['download_content_length'] > 0) {
            // No curl errors - adjust for large files only - take max timeout.
            $timeout = max($timeout, ceil($info['download_content_length'] * 8 / ($bitrate * 1024)));
        }
    }
    $curl = new curl();
    $curl->setHeader($headers2);
    $options['CURLOPT_RETURNTRANSFER'] = true;
    $options['CURLOPT_NOBODY'] = false;
    $options['CURLOPT_TIMEOUT'] = $timeout;
    if ($tofile) {
        $fh = fopen($tofile, 'w');
        if (!$fh) {
            if ($fullresponse) {
                $response = new stdClass();
                $response->status = 0;
                $response->headers = array();
                $response->response_code = 'Can not write to file';
                $response->results = false;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
               AND f.filearea = :filearea)";

    // For each reference we download the file. Then we add it to the file pool and update the references.
    // The reason why we are re-inventing the wheel here is because the current API ends up calling
    // repository::get_file() which includes a download timeout. As we are trying our best to copy
    // the files here, we want to ignre any timeout.
    $filerecords = $DB->get_recordset_sql($sql, array_merge($fragmentparams, array('component' => 'user', 'filearea' => 'draft')));
    $referenceids = array();
    foreach ($filerecords as $filerecord) {
        $file = $fs->get_file_instance($filerecord);
        $reference = unserialize(repository_boxnet::convert_to_valid_reference($file->get_reference()));

        if (empty($reference->downloadurl)) {
            // Something is wrong...
            mtrace('Skipping malformed reference (id: ' . $file->get_referencefileid() . ')');
            continue;
        } else if (strpos($reference->downloadurl, $apiv1signature) === false) {
            // This is not an old reference, we are not supposed to work on thos.
            mtrace('Skipping non APIv1 reference (id: ' . $file->get_referencefileid() . ')');
            continue;
        } else if (isset($referenceids[$file->get_referencefileid()])) {
            // We have already worked on that reference, we skip any other file related to it.
            // We cannot work on them here because they have been updated in the database but our
            // recordset does not have those new values. They will be taken care of after this foreach.
            continue;
        }

        mtrace('Starting migration of file reference ' . $file->get_referencefileid());

        // Manually import the file to the file pool to prevent timeout limitations of the repository method get_file().
        // We ignore the fact that the content of the file could exist locally because we want to synchronize the file
        // now to prevent the repository to try to download the file as well.
        $saveas = $dir . uniqid('', true) . '_' . time() . '.tmp';
        $c = new curl();
        $result = $c->download_one($reference->downloadurl, null, array('filepath' => $saveas, 'followlocation' => true));
        $info = $c->get_info();
        if ($result !== true || !isset($info['http_code']) || $info['http_code'] != 200) {
            // There was a problem while trying to download the reference...
            if ($fs->content_exists($file->get_contenthash()) && $file->get_contenthash() != sha1('')) {
                // Fortunately we already had a local version of this reference, so we keep it. We have to
                // set it synchronized or there is a risk that repository::sync_reference() will try to download
                // the file again. We cannot use $file->get_contenthash() and $file->get_filesize() because they
                // cause repository::sync_reference() to be called.
                $file->set_synchronized($filerecord->contenthash, $filerecord->filesize, 0, DAYSECS);
                mtrace('Could not download reference, using last synced file. (id: ' . $file->get_referencefileid() . ')');
            } else {
                // We don't know what the file was, but what can we do? In order to prevent a re-attempt to fetch the
                // file in the next bit of this script (import_external_file()), we set a dummy content to the reference.
                $file->set_synchronized($dummyhash, $dummysize, 0, DAYSECS);
                mtrace('Could not download reference, dummy file used. (id: ' . $file->get_referencefileid() . ')');
            }
        } else {
            try {
                // The file has been downloaded, we add it to the file pool and synchronize
                // all the files using this reference.
                list($contenthash, $filesize, $unused) = $fs->add_file_to_pool($saveas);
                $file->set_synchronized($contenthash, $filesize, 0, DAYSECS);
            } catch (moodle_exception $e) {
                // Something wrong happened...
                mtrace('Something went wrong during sync (id: ' . $file->get_referencefileid() . ')');
            }
        }

        // Log the reference IDs.
        $referenceids[$file->get_referencefileid()] = $file->get_referencefileid();

        // Now that the file is downloaded, we can loop over all the files using this reference
        // to convert them to local copies. We have chosen to do that in this loop so that if the
        // execution fails in the middle, we would not have to redownload the files again and again.
        // By the way, we cannot use the records fetched in $filerecords because they will not be updated.
        $sql = "SELECT " . $fields . "
                  FROM {files} f
                  LEFT JOIN {files_reference} r
                       ON f.referencefileid = r.id
                 WHERE f.referencefileid = :refid
                   AND NOT (f.component = :component
                   AND f.filearea = :filearea)";
        $reffilerecords = $DB->get_recordset_sql($sql, array('component' => 'user', 'filearea' => 'draft',
            'refid' => $file->get_referencefileid()));
        foreach ($reffilerecords as $reffilerecord) {
            $reffile = $fs->get_file_instance($reffilerecord);
            try {
                // Updating source to remove trace of APIv1 URL.
                $reffile->set_source('Box APIv1 reference');
            } catch (moodle_exception $e) {
                // Do not fail for this lame reason...
            }
            try {
                $fs->import_external_file($reffile);
                mtrace('File using reference converted to local file (id: ' . $reffile->get_id() . ')');
            } catch (moodle_exception $e) {
                // Oh well... we tried what we could!
                $reffile->delete_reference();
                mtrace('Failed to convert file from reference to local file, sorry! (id: ' . $reffile->get_id() . ')');
            }
        }
    }

    mtrace('Migration finished.');
}

 /**
  * Synchronize the references.
  *
  * @param stored_file $file Stored file.
  * @return boolean
  */
 public function sync_reference(stored_file $file)
 {
     if ($file->get_referencelastsync() + DAYSECS > time()) {
         // Synchronise not more often than once a day.
         return false;
     }
     $c = new curl();
     $reference = unserialize(self::convert_to_valid_reference($file->get_reference()));
     $url = $reference->downloadurl;
     if (file_extension_in_typegroup($file->get_filename(), 'web_image')) {
         $path = $this->prepare_file('');
         $result = $c->download_one($url, null, array('filepath' => $path, 'timeout' => $CFG->repositorysyncimagetimeout));
         $info = $c->get_info();
         if ($result === true && isset($info['http_code']) && $info['http_code'] == 200) {
             $fs = get_file_storage();
             list($contenthash, $filesize, $newfile) = $fs->add_file_to_pool($path);
             $file->set_synchronized($contenthash, $filesize);
             return true;
         }
     }
     $c->get($url, null, array('timeout' => $CFG->repositorysyncimagetimeout, 'followlocation' => true, 'nobody' => true));
     $info = $c->get_info();
     if (isset($info['http_code']) && $info['http_code'] == 200 && array_key_exists('download_content_length', $info) && $info['download_content_length'] >= 0) {
         $filesize = (int) $info['download_content_length'];
         $file->set_synchronized(null, $filesize);
         return true;
     }
     $file->set_missingsource();
     return true;
 }

 /**
  * Makes cURL request to get data from the remote site
  *
  * @return string raw request result
  * @throws available_update_checker_exception
  */
 protected function get_response()
 {
     $curl = new curl(array('proxy' => true));
     $response = $curl->post($this->prepare_request_url(), $this->prepare_request_params());
     $curlinfo = $curl->get_info();
     if ($curlinfo['http_code'] != 200) {
         throw new available_update_checker_exception('err_response_http_code', $curlinfo['http_code']);
     }
     return $response;
 }

// ///////////////////////////////////////////////////////////
if (empty($password)) {
    echo 'EQUELLA link checking has not been configured.  Please see the source code for this page.';
    exit;
}
$password_param = required_param('password', PARAM_RAW);
if ($password_param != $password) {
    echo 'Password doesn\'t match.';
    exit;
}
$http = new curl(array('cookie' => true));
echo '<style>.ok {color: green;} .bad {color: red;}</style><ul>';
foreach ($DB->get_records('equella') as $resource) {
    $url = equella_appendtoken($resource->url, equella_getssotoken_api());
    $http->head($url);
    $info = $http->get_info();
    $statuscode = $info['http_code'];
    echo '<li>Checking <a href="' . $resource->url . '">' . $resource->url . '</a><br>';
    if ((int) $statuscode == 200) {
        echo '<span class="ok">OK</span>';
    } else {
        echo '<span class="bad">Could not find in EQUELLA</span><br>';
        // tell someone - get users with course edit perms for the course in question
        $recipients = $DB->get_records_list('user', 'username', $notify);
        if ($recipients) {
            $from = get_admin();
            $subject = get_string('checker.subject', 'equella');
            $course = $DB->get_record('course', array('id' => $resource->course));
            $courseurl = new moodle_url('/course/view.php', array('id' => $course->id));
            $message = get_string('checker.message', 'equella', array('name' => $resource->name, 'url' => $resource->url, 'coursename' => $course->shortname, 'courseurl' => $courseurl));
            echo 'Emailing the following users:<ul>';

/**
 * Check for the availability of a resource by URL.
 *
 * Check is performed using an HTTP HEAD call.
 *
 * @param $url string A valid URL
 * @return bool|string True if no issue is found. The error string message, otherwise
 */
function scorm_check_url($url)
{
    $curl = new curl();
    if (!ini_get('open_basedir') and !ini_get('safe_mode')) {
        // Same options as in {@link download_file_content()}, used in {@link scorm_parse_scorm()}.
        $curl->setopt(array('CURLOPT_FOLLOWLOCATION' => true, 'CURLOPT_MAXREDIRS' => 5));
    }
    $cmsg = $curl->head($url);
    $info = $curl->get_info();
    if (empty($info['http_code']) || $info['http_code'] != 200) {
        return get_string('invalidurlhttpcheck', 'scorm', array('cmsg' => $cmsg));
    }
    return true;
}

 /**
  * Check if the remote site is valid (not localhost and available by the hub)
  * Note: it doesn't matter if the site returns a 404 error.
  * The point here is to check if the site exists. It does not matter if the hub can not call the site,
  * as by security design, a hub should never call a site.
  * However an admin user registering his site should be able to access the site,
  * as people searching on the hub.
  * So we want:
  * a) to check that the url is not a local address
  * b) to check that the site return some not empty headers
  *    (it exists, at least the domain name is registered)
  * @param string $url the site url
  * @return boolean true if the site is valid
  */
 public function is_remote_site_valid($url)
 {
     global $CFG;
     require_once $CFG->libdir . '/filelib.php';
     //Check if site is valid
     if (strpos($url, 'http://localhost') !== false or strpos($url, 'http://127.0.0.1') !== false) {
         return false;
     }
     $curl = new curl();
     $curl->setopt(array('CURLOPT_FOLLOWLOCATION' => true, 'CURLOPT_MAXREDIRS' => 3));
     $curl->head($url);
     $info = $curl->get_info();
     // Return true if return code is OK (200) or redirection (302).
     // Redirection occurs for many reasons including redirection to another site that handles single sign-on.
     if ($info['http_code'] === 200 || $info['http_code'] === 302) {
         return true;
     }
     // Some sites respond to head() with a 503.
     // As a fallback try get().
     // We don't just always do get() as it is much slower than head().
     $curl->get($url);
     $info = $curl->get_info();
     if ($info['http_code'] === 200 || $info['http_code'] === 302) {
         return true;
     }
     return false;
 }

 /**
  * Parses one file (either html or css)
  *
  * @param string $baseurl (optional) URL of the file where link to this file was found
  * @param string $relativeurl relative or absolute link to the file
  * @param array $list
  * @param bool $mainfile true only for main HTML false and false for all embedded/linked files
  */
 protected function parse_file($baseurl, $relativeurl, &$list, $mainfile = false)
 {
     if (preg_match('/([\'"])(.*)\\1/', $relativeurl, $matches)) {
         $relativeurl = $matches[2];
     }
     if (empty($baseurl)) {
         $url = $relativeurl;
     } else {
         $url = htmlspecialchars_decode(url_to_absolute($baseurl, $relativeurl));
     }
     if (in_array($url, $this->processedfiles)) {
         // avoid endless recursion
         return;
     }
     $this->processedfiles[] = $url;
     $curl = new curl();
     $curl->setopt(array('CURLOPT_FOLLOWLOCATION' => true, 'CURLOPT_MAXREDIRS' => 3));
     $msg = $curl->head($url);
     $info = $curl->get_info();
     if ($info['http_code'] != 200) {
         if ($mainfile) {
             $list['error'] = $msg;
         }
     } else {
         $csstoanalyze = '';
         if ($mainfile && (strstr($info['content_type'], 'text/html') || empty($info['content_type']))) {
             // parse as html
             $htmlcontent = $curl->get($info['url']);
             $ddoc = new DOMDocument();
             @$ddoc->loadHTML($htmlcontent);
             // extract <img>
             $tags = $ddoc->getElementsByTagName('img');
             foreach ($tags as $tag) {
                 $url = $tag->getAttribute('src');
                 $this->add_image_to_list($info['url'], $url, $list);
             }
             // analyse embedded css (<style>)
             $tags = $ddoc->getElementsByTagName('style');
             foreach ($tags as $tag) {
                 if ($tag->getAttribute('type') == 'text/css') {
                     $csstoanalyze .= $tag->textContent . "\n";
                 }
             }
             // analyse links to css (<link type='text/css' href='...'>)
             $tags = $ddoc->getElementsByTagName('link');
             foreach ($tags as $tag) {
                 if ($tag->getAttribute('type') == 'text/css' && strlen($tag->getAttribute('href'))) {
                     $this->parse_file($info['url'], $tag->getAttribute('href'), $list);
                 }
             }
         } else {
             if (strstr($info['content_type'], 'css')) {
                 // parse as css
                 $csscontent = $curl->get($info['url']);
                 $csstoanalyze .= $csscontent . "\n";
             } else {
                 if (strstr($info['content_type'], 'image/')) {
                     // download this file
                     $this->add_image_to_list($info['url'], $info['url'], $list);
                 } else {
                     $list['error'] = get_string('validfiletype', 'repository_url');
                 }
             }
         }
         // parse all found css styles
         if (strlen($csstoanalyze)) {
             $urls = extract_css_urls($csstoanalyze);
             if (!empty($urls['property'])) {
                 foreach ($urls['property'] as $url) {
                     $this->add_image_to_list($info['url'], $url, $list);
                 }
             }
             if (!empty($urls['import'])) {
                 foreach ($urls['import'] as $cssurl) {
                     $this->parse_file($info['url'], $cssurl, $list);
                 }
             }
         }
     }
 }

 /**
  * Download the given file into the given destination.
  *
  * This is basically a simplified version of {@link download_file_content()} from
  * Moodle itself, tuned for fetching files from moodle.org servers. Same code is used
  * in mdeploy.php for fetching available updates.
  *
  * @param string $source file url starting with http(s)://
  * @param string $target store the downloaded content to this file (full path)
  * @throws tool_installaddon_installer_exception
  */
 public function download_file($source, $target)
 {
     global $CFG;
     require_once $CFG->libdir . '/filelib.php';
     $targetfile = fopen($target, 'w');
     if (!$targetfile) {
         throw new tool_installaddon_installer_exception('err_download_write_file', $target);
     }
     $options = array('file' => $targetfile, 'timeout' => 300, 'followlocation' => true, 'maxredirs' => 3, 'ssl_verifypeer' => true, 'ssl_verifyhost' => 2);
     $curl = new curl(array('proxy' => true));
     $result = $curl->download_one($source, null, $options);
     $curlinfo = $curl->get_info();
     fclose($targetfile);
     if ($result !== true) {
         throw new tool_installaddon_installer_exception('err_curl_exec', array('url' => $source, 'errorno' => $curl->get_errno(), 'error' => $result));
     } else {
         if (empty($curlinfo['http_code']) or $curlinfo['http_code'] != 200) {
             throw new tool_installaddon_installer_exception('err_curl_http_code', array('url' => $source, 'http_code' => $curlinfo['http_code']));
         } else {
             if (isset($curlinfo['ssl_verify_result']) and $curlinfo['ssl_verify_result'] != 0) {
                 throw new tool_installaddon_installer_exception('err_curl_ssl_verify', array('url' => $source, 'ssl_verify_result' => $curlinfo['ssl_verify_result']));
             }
         }
     }
 }

  /**
  * Returns information about file in this repository by reference
  * {@link repository::get_file_reference()}
  * {@link repository::get_file()}
  *
  * Returns null if file not found or is not readable
  *
  * @param stdClass $reference file reference db record
  * @return null|stdClass with attribute 'filepath'
  */
 public function get_file_by_reference($reference) {
     $reference = unserialize(self::convert_to_valid_reference($reference->reference));
     $url = $reference->downloadurl;
     $c = new curl();
     $c->get($url, null, array('timeout' => self::SYNCIMAGE_TIMEOUT, 'followlocation' => true, 'nobody' => true));
     $info = $c->get_info();
     if (isset($info['http_code']) && $info['http_code'] == 200 &&
             array_key_exists('download_content_length', $info) &&
             $info['download_content_length'] >= 0) {
         $filesize = (int)$info['download_content_length'];
         return (object) array('filesize' => $filesize);
     }
     return null;
 }

 /**
  * Makes cURL request to get data from the remote site
  *
  * @return string raw request result
  * @throws available_update_checker_exception
  */
 protected function get_response()
 {
     global $CFG;
     require_once $CFG->libdir . '/filelib.php';
     $curl = new curl(array('proxy' => true));
     $response = $curl->post($this->prepare_request_url(), $this->prepare_request_params(), $this->prepare_request_options());
     $curlerrno = $curl->get_errno();
     if (!empty($curlerrno)) {
         throw new available_update_checker_exception('err_response_curl', 'cURL error ' . $curlerrno . ': ' . $curl->error);
     }
     $curlinfo = $curl->get_info();
     if ($curlinfo['http_code'] != 200) {
         throw new available_update_checker_exception('err_response_http_code', $curlinfo['http_code']);
     }
     return $response;
 }

    /**
     * Returns information about file in this repository by reference
     *
     * If the file is an image we download the contents and save it in our filesystem
     * so we can generate thumbnails. Otherwise we just request the file size.
     * Returns null if file not found or can not be accessed
     *
     * @param stdClass $reference file reference db record
     * @return stdClass|null contains one of the following:
     *   - 'filesize' (for non-image files or files we failed to retrieve fully because of timeout)
     *   - 'filepath' (for image files that we retrieived and saved)
     */
    public function get_file_by_reference($reference) {
        global $USER;
        $ref = @unserialize(base64_decode($reference->reference));
        if (!isset($ref->url) || !($url = $this->appendtoken($ref->url))) {
            // Occurs when the user isn't known..
            return null;
        }

        $return = null;
        $cookiepathname = $this->prepare_file($USER->id. '_'. uniqid('', true). '.cookie');
        $c = new curl(array('cookie' => $cookiepathname));
        if (file_extension_in_typegroup($ref->filename, 'web_image')) {
            $path = $this->prepare_file('');
            $result = $c->download_one($url, null, array('filepath' => $path, 'followlocation' => true, 'timeout' => self::SYNCIMAGE_TIMEOUT));
            if ($result === true) {
                $return = (object)array('filepath' => $path);
            }
        } else {
            $result = $c->head($url, array('followlocation' => true, 'timeout' => self::SYNCFILE_TIMEOUT));
        }
        // Delete cookie jar.
        if (file_exists($cookiepathname)) {
            unlink($cookiepathname);
        }

        $this->connection_result($c->get_errno());
        $curlinfo = $c->get_info();
        if ($return === null && isset($curlinfo['http_code']) && $curlinfo['http_code'] == 200
                && array_key_exists('download_content_length', $curlinfo)
                && $curlinfo['download_content_length'] >= 0) {
            // we received a correct header and at least can tell the file size
            $return = (object)array('filesize' => $curlinfo['download_content_length']);
        }
        return $return;
    }

 /**
  * Builds XHTML to display the control.
  * The main purpose of this overloading is to display a warning when https
  * is not supported by the server
  * @param string $data Unused
  * @param string $query
  * @return string XHTML
  */
 public function output_html($data, $query = '')
 {
     global $CFG, $OUTPUT;
     $html = parent::output_html($data, $query);
     if ((string) $data === $this->yes) {
         require_once $CFG->dirroot . "/lib/filelib.php";
         $curl = new curl();
         $httpswwwroot = str_replace('http:', 'https:', $CFG->wwwroot);
         //force https url
         $curl->head($httpswwwroot . "/login/index.php");
         $info = $curl->get_info();
         if (empty($info['http_code']) or $info['http_code'] >= 400) {
             $html .= $OUTPUT->notification(get_string('nohttpsformobilewarning', 'admin'));
         }
     }
     return $html;
 }