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Use If-Modified-Since-HTTP-Header

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Skip downloading a potentially huge calendar file if it the same as out
local copy, using the If-Modified-Since-HTTP-Header.

Signed-off-by: Andrew McMillan <andrew@morphoss.com>
This commit is contained in:
Philipp Matthias Hahn 2012-01-11 23:14:26 +01:00 committed by Andrew McMillan
parent c9467618d7
commit fb3eca0b07
1 changed files with 4 additions and 1 deletions
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5
inc/external-fetch.php
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@ -55,14 +55,17 @@ function fetch_external ( $bind_id, $min_age = '1 hour' )
$sql .= ' ORDER BY modified DESC LIMIT 1';
$qry = new AwlQuery( $sql, $params );
if ( $qry->Exec('DAVResource') && $qry->rows() > 0 && $row = $qry->Fetch() ) {
$local_ts = new DateTime($row->modified);
$curl = curl_init ( $row->external_url );
curl_setopt ( $curl, CURLOPT_RETURNTRANSFER, true );
curl_setopt ( $curl, CURLOPT_HEADER, true );
curl_setopt ( $curl, CURLOPT_FILETIME, true );
curl_setopt ( $curl, CURLOPT_NOBODY, true );
curl_setopt ( $curl, CURLOPT_TIMEVALUE, $local_ts->format("U") );
curl_setopt ( $curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE );
$ics = curl_exec ( $curl );
$info = curl_getinfo ( $curl );
if ( isset($info['filetime']) && new DateTime("@" . $info['filetime']) <= $local_ts ) {
if ( $info['http_code'] === 304 || isset($info['filetime']) && new DateTime("@" . $info['filetime']) <= $local_ts ) {
dbg_error_log("external", "external resource unchanged " . $info['filetime'] );
curl_close ( $curl );
// BUGlet: should track server-time instead of local-time