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<?php
/**
* Implements uploading from a HTTP resource.
*
* @file
* @ingroup upload
* @author Bryan Tong Minh
* @author Michael Dale
*/
class UploadFromUrl extends UploadBase {
protected $mAsync, $mUrl;
protected $mIgnoreWarnings = true;
/**
* Checks if the user is allowed to use the upload-by-URL feature. If the
* user is allowed, pass on permissions checking to the parent.
*/
public static function isAllowed( $user ) {
if ( !$user->isAllowed( 'upload_by_url' ) )
return 'upload_by_url';
return parent::isAllowed( $user );
}
/**
* Checks if the upload from URL feature is enabled
* @return bool
*/
public static function isEnabled() {
global $wgAllowCopyUploads;
return $wgAllowCopyUploads && parent::isEnabled();
}
/**
* Entry point for API upload
*
* @param $name string
* @param $url string
* @param $async mixed Whether the download should be performed
* asynchronous. False for synchronous, async or async-leavemessage for
* asynchronous download.
*/
public function initialize( $name, $url, $async = false ) {
global $wgAllowAsyncCopyUploads;
$this->mUrl = $url;
$this->mAsync = $wgAllowAsyncCopyUploads ? $async : false;
$tempPath = $this->mAsync ? null : $this->makeTemporaryFile();
# File size and removeTempFile will be filled in later
$this->initializePathInfo( $name, $tempPath, 0, false );
}
/**
* Entry point for SpecialUpload
* @param $request Object: WebRequest object
*/
public function initializeFromRequest( &$request ) {
$desiredDestName = $request->getText( 'wpDestFile' );
if ( !$desiredDestName )
$desiredDestName = $request->getText( 'wpUploadFileURL' );
return $this->initialize(
$desiredDestName,
$request->getVal( 'wpUploadFileURL' ),
false
);
}
/**
* @param $request Object: WebRequest object
*/
public static function isValidRequest( $request ) {
global $wgUser;
$url = $request->getVal( 'wpUploadFileURL' );
return !empty( $url )
&& Http::isValidURI( $url )
&& $wgUser->isAllowed( 'upload_by_url' );
}
public function fetchFile() {
if ( !Http::isValidURI( $this->mUrl ) ) {
return Status::newFatal( 'http-invalid-url' );
}
if ( !$this->mAsync ) {
return $this->reallyFetchFile();
}
return Status::newGood();
}
/**
* Create a new temporary file in the URL subdirectory of wfTempDir().
*
* @return string Path to the file
*/
protected function makeTemporaryFile() {
return tempnam( wfTempDir(), 'URL' );
}
/**
* Callback: save a chunk of the result of a HTTP request to the temporary file
*
* @param $req mixed
* @param $buffer string
* @return int number of bytes handled
*/
public function saveTempFileChunk( $req, $buffer ) {
$nbytes = fwrite( $this->mTmpHandle, $buffer );
if ( $nbytes == strlen( $buffer ) ) {
$this->mFileSize += $nbytes;
} else {
// Well... that's not good!
fclose( $this->mTmpHandle );
$this->mTmpHandle = false;
}
return $nbytes;
}
/**
* Download the file, save it to the temporary file and update the file
* size and set $mRemoveTempFile to true.
*/
protected function reallyFetchFile() {
if ( $this->mTempPath === false ) {
return Status::newFatal( 'tmp-create-error' );
}
// Note the temporary file should already be created by makeTemporaryFile()
$this->mTmpHandle = fopen( $this->mTempPath, 'wb' );
if ( !$this->mTmpHandle ) {
return Status::newFatal( 'tmp-create-error' );
}
$this->mRemoveTempFile = true;
$this->mFileSize = 0;
$req = MWHttpRequest::factory( $this->mUrl );
$req->setCallback( array( $this, 'saveTempFileChunk' ) );
$status = $req->execute();
if ( $this->mTmpHandle ) {
// File got written ok...
fclose( $this->mTmpHandle );
$this->mTmpHandle = null;
} else {
// We encountered a write error during the download...
return Status::newFatal( 'tmp-write-error' );
}
if ( !$status->isOk() ) {
return $status;
}
return $status;
}
/**
* Wrapper around the parent function in order to defer verifying the
* upload until the file really has been fetched.
*/
public function verifyUpload() {
if ( $this->mAsync ) {
return array( 'status' => UploadBase::OK );
}
return parent::verifyUpload();
}
/**
* Wrapper around the parent function in order to defer checking warnings
* until the file really has been fetched.
*/
public function checkWarnings() {
if ( $this->mAsync ) {
$this->mIgnoreWarnings = false;
return array();
}
return parent::checkWarnings();
}
/**
* Wrapper around the parent function in order to defer checking protection
* until we are sure that the file can actually be uploaded
*/
public function verifyPermissions( $user ) {
if ( $this->mAsync ) {
return true;
}
return parent::verifyPermissions( $user );
}
/**
* Wrapper around the parent function in order to defer uploading to the
* job queue for asynchronous uploads
*/
public function performUpload( $comment, $pageText, $watch, $user ) {
if ( $this->mAsync ) {
$sessionKey = $this->insertJob( $comment, $pageText, $watch, $user );
$status = new Status;
$status->error( 'async', $sessionKey );
return $status;
}
return parent::performUpload( $comment, $pageText, $watch, $user );
}
protected function insertJob( $comment, $pageText, $watch, $user ) {
$sessionKey = $this->stashSession();
$job = new UploadFromUrlJob( $this->getTitle(), array(
'url' => $this->mUrl,
'comment' => $comment,
'pageText' => $pageText,
'watch' => $watch,
'userName' => $user->getName(),
'leaveMessage' => $this->mAsync == 'async-leavemessage',
'ignoreWarnings' => $this->mIgnoreWarnings,
'sessionId' => session_id(),
'sessionKey' => $sessionKey,
) );
$job->initializeSessionData();
$job->insert();
return $sessionKey;
}
}
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