PHP curl::head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;
 }

 /**
  * Send the request via our curl object.
  *
  * @param curl $curl prepared curl object.
  * @param Google_HttpRequest $request The request.
  * @return string result of the request.
  */
 private function do_request($curl, $request)
 {
     $url = $request->getUrl();
     $method = $request->getRequestMethod();
     switch (strtoupper($method)) {
         case 'POST':
             $ret = $curl->post($url, $request->getPostBody());
             break;
         case 'GET':
             $ret = $curl->get($url);
             break;
         case 'HEAD':
             $ret = $curl->head($url);
             break;
         case 'PUT':
             $ret = $curl->put($url);
             break;
         default:
             throw new coding_exception('Unknown request type: ' . $method);
             break;
     }
     return $ret;
 }

/**
 * 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;
}

 /**
  * 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;
 }

 /**
  * Checks if the mdeploy.php will be able to fetch the ZIP from the given URL
  *
  * This is mainly supposed to check if the transmission over HTTPS would
  * work. That is, if the CA certificates are present at the server.
  *
  * @param string $downloadurl the URL of the ZIP package to download
  * @return bool
  */
 protected function update_downloadable($downloadurl)
 {
     global $CFG;
     $curloptions = array('CURLOPT_SSL_VERIFYHOST' => 2, 'CURLOPT_SSL_VERIFYPEER' => true);
     $curl = new curl(array('proxy' => true));
     $result = $curl->head($downloadurl, $curloptions);
     $errno = $curl->get_errno();
     if (empty($errno)) {
         return true;
     } else {
         return false;
     }
 }

/**
 * 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.........

 /**
  * Checks if the mdeploy.php will be able to fetch the ZIP from the given URL
  *
  * This is mainly supposed to check if the transmission over HTTPS would
  * work. That is, if the CA certificates are present at the server.
  *
  * @param string $downloadurl the URL of the ZIP package to download
  * @return bool
  */
 protected function update_downloadable($downloadurl)
 {
     global $CFG;
     $curloptions = array('CURLOPT_SSL_VERIFYHOST' => 2, 'CURLOPT_SSL_VERIFYPEER' => true);
     $cacertfile = $CFG->dataroot . '/moodleorgca.crt';
     if (is_readable($cacertfile)) {
         // Do not use CA certs provided by the operating system. Instead,
         // use this CA cert to verify the updates provider.
         $curloptions['CURLOPT_CAINFO'] = $cacertfile;
     }
     $curl = new curl(array('proxy' => true));
     $result = $curl->head($downloadurl, $curloptions);
     $errno = $curl->get_errno();
     if (empty($errno)) {
         return true;
     } else {
         return false;
     }
 }

    /**
     * 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;
    }

 /**
  * 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);
                 }
             }
         }
     }
 }

 public function sync_reference(stored_file $file)
 {
     global $USER;
     if ($file->get_referencelastsync() + DAYSECS > time() || !$this->connection_result()) {
         // Synchronise not more often than once a day.
         // if we had several unsuccessfull attempts to connect to server - do not try any more.
         return false;
     }
     $ref = @unserialize(base64_decode($file->get_reference()));
     if (!isset($ref->url) || !($url = $this->appendtoken($ref->url))) {
         // Occurs when the user isn't known..
         $file->set_missingsource();
         return true;
     }
     $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' => $CFG->repositorysyncimagetimeout));
         if ($result === true) {
             $fs = get_file_storage();
             list($contenthash, $filesize, $newfile) = $fs->add_file_to_pool($path);
             $file->set_synchronized($contenthash, $filesize);
             return true;
         }
     } else {
         $result = $c->head($url, array('followlocation' => true, 'timeout' => $CFG->repositorysyncfiletimeout));
     }
     // Delete cookie jar.
     if (file_exists($cookiepathname)) {
         unlink($cookiepathname);
     }
     $this->connection_result($c->get_errno());
     $curlinfo = $c->get_info();
     if (isset($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
         $file->set_synchronized(null, $curlinfo['download_content_length']);
         return true;
     }
     $file->set_missingsource();
     return true;
 }

$notify = array('some.user');
// ///////////////////////////////////////////////////////////
if (empty($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));

    /**
     * Checks if the mdeploy.php will be able to fetch the ZIP from the given URL
     *
     * This is mainly supposed to check if the transmission over HTTPS would
     * work. That is, if the CA certificates are present at the server.
     *
     * @param string $downloadurl the URL of the ZIP package to download
     * @return bool
     */
    protected function update_downloadable($downloadurl) {
        global $CFG;

        $curloptions = array(
            'CURLOPT_SSL_VERIFYHOST' => 2,      // this is the default in {@link curl} class but just in case
            'CURLOPT_SSL_VERIFYPEER' => true,
        );

        $curl = new curl(array('proxy' => true));
        $result = $curl->head($downloadurl, $curloptions);
        $errno = $curl->get_errno();
        if (empty($errno)) {
            return true;
        } else {
            return false;
        }
    }