achmizs/pmwiki-versioned-assets
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Said Achmiz 2019-01-28 10:51:01 -05:00
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<?php
/** \versioned_assets.php
* \Copyright (c) 2017 Said Achmiz
* \Licensed under the MIT License
* \brief Adds versions (modification timestamps) to attachment URLs, so that browser
* caches invalidate properly when attachments are updated.
*/
$RecipeInfo['VersionedAssets']['Version'] = '2017-12-13';
global $LinkFunctions;
$LinkFunctions['Attach:'] = 'LinkUploadVersioned';
SDV($VersionedAssetsReattachFileExtension, true);
function LinkUploadVersioned($pagename, $imap, $path, $alt, $txt, $fmt=NULL) {
global $FmtV, $UploadFileFmt, $LinkUploadCreateFmt,
$UploadUrlFmt, $UploadPrefixFmt, $EnableDirectDownload;
if (preg_match('!^(.*)/([^/]+)$!', $path, $match)) {
$pagename = MakePageName($pagename, $match[1]);
$path = $match[2];
}
$upname = MakeUploadName($pagename, $path);
$encname = rawurlencode($upname);
$filepath = FmtPageName("$UploadFileFmt/$upname", $pagename);
$FmtV['$LinkUpload'] =
FmtPageName("\$PageUrl?action=upload&amp;upname=$encname", $pagename);
$FmtV['$LinkText'] = $txt;
if (!file_exists($filepath))
return FmtPageName($LinkUploadCreateFmt, $pagename);
$path = PUE(FmtPageName(IsEnabled($EnableDirectDownload, 1)
? "$UploadUrlFmt$UploadPrefixFmt/$encname"
: "{\$PageUrl}?action=download&amp;upname=$encname",
$pagename));
## Append the modification time to the URL as a GET parameter; this should be ignored
## by the web server, but is seen as part of the unique URL of the remote resource by
## the browser; when it changes (because the attachment has been modified), the
## browser will see that it doesn’t have a cached version of the resource under the
## new URL, and will retrieve the updated version.
$versioned_path = $path . "?v=" . filemtime($filepath);
global $VersionedAssetsReattachFileExtension;
if ($VersionedAssetsReattachFileExtension == true) {
## Re-attach the file extension, so that LinkIcons and such things work properly.
preg_match("/\\.[^\\.]+$/", $path, $matches);
$versioned_path .= $matches[0];
}
return LinkIMap($pagename, $imap, $versioned_path, $alt, $txt, $fmt);
}