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function http_request_get in Feeds 6

Same name and namespace in other branches
  1. 8.2 libraries/http_request.inc \http_request_get()
  2. 7.2 libraries/http_request.inc \http_request_get()
  3. 7 libraries/http_request.inc \http_request_get()

Get the content from the given URL.

Parameters

string $url: A valid URL (not only web URLs).

string $username: If the URL uses authentication, supply the username.

string $password: If the URL uses authentication, supply the password.

bool $accept_invalid_cert: Whether to accept invalid certificates.

integer $timeout: Timeout in seconds to wait for an HTTP get request to finish.

Return value

stdClass An object that describes the data downloaded from $url.

3 calls to http_request_get()
FeedsEnclosure::getContent in plugins/FeedsParser.inc
FeedsHTTPBatch::getRaw in plugins/FeedsHTTPFetcher.inc
Implementation of FeedsImportBatch::getRaw();
http_request_get_common_syndication in libraries/http_request.inc
Discovers RSS or atom feeds at the given URL.

File

libraries/http_request.inc, line 88
Download via HTTP.

Code

function http_request_get($url, $username = NULL, $password = NULL, $accept_invalid_cert = FALSE, $timeout = NULL) {

  // Intra-pagedownload cache, avoid to download the same content twice within
  // one page download (it's possible, compatible and parse calls).
  static $download_cache = array();
  if (isset($download_cache[$url])) {
    return $download_cache[$url];
  }

  // Determine request timeout.
  $request_timeout = !empty($timeout) ? $timeout : variable_get('http_request_timeout', 30);
  if (!$username && valid_url($url, TRUE)) {

    // Handle password protected feeds.
    $url_parts = parse_url($url);
    if (!empty($url_parts['user'])) {
      $password = $url_parts['pass'];
      $username = $url_parts['user'];
    }
  }
  $curl = http_request_use_curl();

  // Only download and parse data if really needs refresh.
  // Based on "Last-Modified" and "If-Modified-Since".
  $headers = array();
  if ($cache = cache_get('feeds_http_download_' . md5($url))) {
    $last_result = $cache->data;
    $last_headers = array_change_key_case($last_result->headers);
    if (!empty($last_headers['etag'])) {
      if ($curl) {
        $headers[] = 'If-None-Match: ' . $last_headers['etag'];
      }
      else {
        $headers['If-None-Match'] = $last_headers['etag'];
      }
    }
    if (!empty($last_headers['last-modified'])) {
      if ($curl) {
        $headers[] = 'If-Modified-Since: ' . $last_headers['last-modified'];
      }
      else {
        $headers['If-Modified-Since'] = $last_headers['last-modified'];
      }
    }
    if (!empty($username) && !$curl) {
      $headers['Authorization'] = 'Basic ' . base64_encode("{$username}:{$password}");
    }
  }

  // Support the 'feed' and 'webcal' schemes by converting them into 'http'.
  $url = strtr($url, array(
    'feed://' => 'http://',
    'webcal://' => 'http://',
  ));
  if ($curl) {
    $headers[] = 'User-Agent: Drupal (+http://drupal.org/)';
    $result = new stdClass();
    $result->headers = array();

    // Parse the URL and make sure we can handle the schema.
    // cURL can only support either http:// or https://.
    // CURLOPT_PROTOCOLS is only supported with cURL 7.19.4
    $uri = parse_url($url);
    if (!isset($uri['scheme'])) {
      $result->error = 'missing schema';
      $result->code = -1002;
    }
    else {
      switch ($uri['scheme']) {
        case 'http':
        case 'https':

          // Valid scheme.
          break;
        default:
          $result->error = 'invalid schema ' . $uri['scheme'];
          $result->code = -1003;
          break;
      }
    }

    // If the scheme was valid, continue to request the feed using cURL.
    if (empty($result->error)) {
      $download = curl_init($url);
      curl_setopt($download, CURLOPT_FOLLOWLOCATION, TRUE);
      if (!empty($username)) {
        curl_setopt($download, CURLOPT_USERPWD, "{$username}:{$password}");
        curl_setopt($download, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
      }
      curl_setopt($download, CURLOPT_HTTPHEADER, $headers);
      curl_setopt($download, CURLOPT_HEADER, TRUE);
      curl_setopt($download, CURLOPT_RETURNTRANSFER, TRUE);
      curl_setopt($download, CURLOPT_ENCODING, '');
      curl_setopt($download, CURLOPT_TIMEOUT, $request_timeout);
      if ($accept_invalid_cert) {
        curl_setopt($download, CURLOPT_SSL_VERIFYPEER, 0);
      }
      $header = '';
      $data = curl_exec($download);
      if (curl_error($download)) {
        throw new HRCurlException(t('cURL error (@code) @error for @url', array(
          '@code' => curl_errno($download),
          '@error' => curl_error($download),
          '@url' => $url,
        )), curl_errno($download));
      }
      $header_size = curl_getinfo($download, CURLINFO_HEADER_SIZE);
      $header = substr($data, 0, $header_size - 1);
      $result->data = substr($data, $header_size);
      $headers = preg_split("/(\r\n){2}/", $header);
      $header_lines = preg_split("/\r\n|\n|\r/", end($headers));

      // Skip HTTP response status.
      array_shift($header_lines);
      while ($line = trim(array_shift($header_lines))) {
        list($header, $value) = explode(':', $line, 2);

        // Normalize the headers.
        $header = strtolower($header);
        if (isset($result->headers[$header]) && $header == 'set-cookie') {

          // RFC 2109: the Set-Cookie response header comprises the token Set-
          // Cookie:, followed by a comma-separated list of one or more cookies.
          $result->headers[$header] .= ',' . trim($value);
        }
        else {
          $result->headers[$header] = trim($value);
        }
      }
      $result->code = curl_getinfo($download, CURLINFO_HTTP_CODE);
      curl_close($download);
    }
  }
  else {
    $result = drupal_http_request($url, $headers, 'GET', NULL, 3, $request_timeout);
    $result->headers = isset($result->headers) ? $result->headers : array();
  }
  $result->code = isset($result->code) ? $result->code : 200;

  // In case of 304 Not Modified try to return cached data.
  if ($result->code == 304) {
    if (isset($last_result)) {
      $last_result->from_cache = TRUE;
      return $last_result;
    }
    else {

      // It's a tragedy, this file must exist and contain good data.
      // In this case, clear cache and repeat.
      cache_clear_all('feeds_http_download_' . md5($url), 'cache');
      return http_request_get($url, $username, $password, $accept_invalid_cert, $request_timeout);
    }
  }

  // Set caches.
  cache_set('feeds_http_download_' . md5($url), $result);
  $download_cache[$url] = $result;
  return $result;
}