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support ETag and Last-Modified headers

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This commit is contained in:
Denis Ryabov 2014-07-23 10:50:26 +04:00
parent d957239a1b
commit 639e5c8797
2 changed files with 56 additions and 2 deletions
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5
habr_twister.php
View File

@ -4,9 +4,10 @@ mb_internal_encoding('UTF-8');
setlocale(LC_CTYPE, 'en_US.UTF-8');
// Load RSS feed
require_once 'rssreader.php';
$feed_uri = 'http://habrahabr.ru/rss/hubs/new/';
$rss = simplexml_load_file($feed_uri);
if (!$rss) die('Cannot read rss');
$rss = getRssFeed($feed_uri);
if (!$rss) die('Cannot read rss or it is up to date');
// Initialise TwisterPost
require_once 'twisterpost.php';

53
rssreader.php Normal file
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@ -0,0 +1,53 @@
<?php
function getRssFeed($feed_uri, $reload = false)
{
$meta_file = md5($feed_uri) . '.json';
$meta = @json_decode(@file_get_contents($meta_file), true);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $feed_uri);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
if (!$reload) {
if (isset($meta['etag']))
curl_setopt($ch, CURLOPT_HTTPHEADER, array('If-None-Match: ' . $meta['etag']));
if (isset($meta['lastModified']))
curl_setopt($ch, CURLOPT_HTTPHEADER, array('If-Modified-Since: ' . $meta['lastModified']));
}
$response = curl_exec($ch);
$info = curl_getinfo($ch);
$http_code = $info['http_code'];
if ($http_code !== 200)
return false;
$headers = substr($response, 0, $info['header_size']);
$headers_arr = array();
foreach (explode("\n", $headers) as $h) {
$h = explode(':', $h, 2);
if (!isset($h[1])) continue;
$key = $h[0];
$value = trim($h[1]);
if (!isset($headers_arr[$key]))
$headers_arr[$key] = $value;
elseif (is_array($headers[$key]))
$headers_arr[$key][] = $value;
else
$headers_arr[$key] = array($headers_arr[$key], $value);
}
$meta = array();
if (isset($headers_arr['Etag']))
$meta['etag'] = $headers_arr['Etag'];
if (isset($headers_arr['Last-Modified']))
$meta['lastModified'] = $headers_arr['Last-Modified'];
file_put_contents($meta_file, json_encode($meta));
$body = substr($response, $info['header_size']);
return @simplexml_load_string($body);
}