function execute( $par = null ) {
global $wgOut, $wgRequest, $wgUser;
$this->setHeaders();
if ( $wgUser->isAllowed( 'sigadmin' ) ) {
$this->mDocumentId = (int) $wgRequest->getVal( 'doc', null );
if ( $this->mDocumentId && !is_null( $wgRequest->getVal( 'viewsigs' ) ) ) {
$tmp = new SignatureViewer();
$tmp->execute();
return;
}
if ( $this->mDocumentId == null )
$this->showSelectDocument();
elseif ( !$wgRequest->wasPosted() ) {
$this->mCurrentSig = SignDocumentSignature::newBasic();
$this->showSignForm();
}
else {
$this->dealWithPost();
}
}
else {
$wgOut->permissionRequired( 'sigadmin' );
}
}
