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<?php
/**
* A foreign repository with a remote MediaWiki with an API thingy
* Very hacky and inefficient
* do not use except for testing :D
*
* Example config:
*
* $wgForeignFileRepos[] = array(
* 'class' => 'ForeignAPIRepo',
* 'name' => 'shared',
* 'apibase' => 'http://en.wikipedia.org/w/api.php',
* 'fetchDescription' => true, // Optional
* 'descriptionCacheExpiry' => 3600,
* );
*
* @ingroup FileRepo
*/
class ForeignAPIRepo extends FileRepo {
var $fileFactory = array( 'ForeignAPIFile', 'newFromTitle' );
var $apiThumbCacheExpiry = 0;
protected $mQueryCache = array();
function __construct( $info ) {
parent::__construct( $info );
$this->mApiBase = $info['apibase']; // http://commons.wikimedia.org/w/api.php
if( !$this->scriptDirUrl ) {
// hack for description fetches
$this->scriptDirUrl = dirname( $this->mApiBase );
}
}
/**
* No-ops
*/
function storeBatch( $triplets, $flags = 0 ) {
return false;
}
function storeTemp( $originalName, $srcPath ) {
return false;
}
function publishBatch( $triplets, $flags = 0 ) {
return false;
}
function deleteBatch( $sourceDestPairs ) {
return false;
}
function getFileProps( $virtualUrl ) {
return false;
}
protected function queryImage( $query ) {
$data = $this->fetchImageQuery( $query );
if( isset( $data['query']['pages'] ) ) {
foreach( $data['query']['pages'] as $pageid => $info ) {
if( isset( $info['imageinfo'][0] ) ) {
return $info['imageinfo'][0];
}
}
}
return false;
}
protected function fetchImageQuery( $query ) {
global $wgMemc;
$url = $this->mApiBase .
'?' .
wfArrayToCgi(
array_merge( $query,
array(
'format' => 'json',
'action' => 'query' ) ) );
if( !isset( $this->mQueryCache[$url] ) ) {
$key = wfMemcKey( 'ForeignAPIRepo', 'Metadata', md5( $url ) );
$data = $wgMemc->get( $key );
if( !$data ) {
$data = Http::get( $url );
if ( !$data ) {
return null;
}
$wgMemc->set( $key, $data, 3600 );
}
if( count( $this->mQueryCache ) > 100 ) {
// Keep the cache from growing infinitely
$this->mQueryCache = array();
}
$this->mQueryCache[$url] = $data;
}
return json_decode( $this->mQueryCache[$url], true );
}
function getImageInfo( $title, $time = false ) {
return $this->queryImage( array(
'titles' => 'Image:' . $title->getText(),
'iiprop' => 'timestamp|user|comment|url|size|sha1|metadata|mime',
'prop' => 'imageinfo' ) );
}
function findBySha1( $hash ) {
$results = $this->fetchImageQuery( array(
'aisha1base36' => $hash,
'aiprop' => 'timestamp|user|comment|url|size|sha1|metadata|mime',
'list' => 'allimages', ) );
$ret = array();
if ( isset( $results['query']['allimages'] ) ) {
foreach ( $results['query']['allimages'] as $img ) {
$ret[] = new ForeignAPIFile( Title::makeTitle( NS_IMAGE, $img['name'] ), $this, $img );
}
}
return $ret;
}
function getThumbUrl( $name, $width=-1, $height=-1 ) {
$info = $this->queryImage( array(
'titles' => 'Image:' . $name,
'iiprop' => 'url',
'iiurlwidth' => $width,
'iiurlheight' => $height,
'prop' => 'imageinfo' ) );
if( $info ) {
wfDebug( __METHOD__ . " got remote thumb " . $info['thumburl'] . "\n" );
return $info['thumburl'];
} else {
return false;
}
}
function getThumbUrlFromCache( $name, $width, $height ) {
global $wgMemc, $wgUploadPath, $wgServer, $wgUploadDirectory;
if ( !$this->canCacheThumbs() ) {
return $this->getThumbUrl( $name, $width, $height );
}
$key = wfMemcKey( 'ForeignAPIRepo', 'ThumbUrl', $name );
if ( $thumbUrl = $wgMemc->get($key) ) {
wfDebug("Got thumb from local cache. $thumbUrl \n");
return $thumbUrl;
}
else {
$foreignUrl = $this->getThumbUrl( $name, $width, $height );
// We need the same filename as the remote one :)
$fileName = ltrim( substr( $foreignUrl, strrpos( $foreignUrl, '/' ) ), '/' );
$path = 'thumb/' . $this->getHashPath( $name ) . $name . "/";
if ( !is_dir($wgUploadDirectory . '/' . $path) ) {
wfMkdirParents($wgUploadDirectory . '/' . $path);
}
if ( !is_writable( $wgUploadDirectory . '/' . $path . $fileName ) ) {
wfDebug( __METHOD__ . " could not write to thumb path\n" );
return $foreignUrl;
}
$localUrl = $wgServer . $wgUploadPath . '/' . $path . $fileName;
$thumb = Http::get( $foreignUrl );
# FIXME: Delete old thumbs that aren't being used. Maintenance script?
file_put_contents($wgUploadDirectory . '/' . $path . $fileName, $thumb );
$wgMemc->set( $key, $localUrl, $this->apiThumbCacheExpiry );
wfDebug( __METHOD__ . " got local thumb $localUrl, saving to cache \n" );
return $localUrl;
}
}
/**
* Are we locally caching the thumbnails?
* @return bool
*/
public function canCacheThumbs() {
return ( $this->apiThumbCacheExpiry > 0 );
}
}
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