Laravel文件上传验证

我是Laravel的新手。我有一个带有文件上传功能的表单。如何验证他们的文件？我将只允许使用Microsoft Word文件。这是我的验证码。

我只想检查他们是否插入ms word文件，否则将不被处理。

public function store()
{
  // Validate
    $rules = array(
        'pda'                         => 'required|unique:forms',
        'controlnum'                  => 'required|unique:forms',
        'date'                        => 'required',
        'churchname'                  => 'required',
        'title'                       => 'required',
        'pastorname'                  => 'required',
        'contactnum'                  => 'required',
        'address'                     => 'required',
        'state'                       => 'required',
        'region'                      => 'required',
        'area'                        => 'required',
        'city'                        => 'required',
        'zipcode'                     => 'required|numeric|max:9999',
        'tgjteachertraining'          => 'required',
        'localcontact'                => 'required',
        'tgjdatestart'                => 'required',
        'tgjdateend'                  => 'required',
        'tgjcourse'                   => 'required|numeric',
        'childrengraduated'           => 'required|numeric|max:450',
        'childrenacceptjesus'         => 'required|numeric',
        'howmanycomitted'             => 'required|numeric',
        'recievedbibles'              => 'required|numeric',
        'descgradevent'               => 'required',
        'whatwillyoudo'               => 'required',
        'pastortest'                  => 'required',
        'teachertest'                 => 'required',
        'childrentest'                => 'required',
        'file'                        => 'required|max:10000',
    );

    $validator = Validator::make(Input::all(), $rules);

    // process the form
    if ($validator->fails()) {
        return Redirect::to('forms/create')->withErrors($validator);
    } else {
        // store
        $forms = new Forms;
        $forms->pda                         = Input::get('pda');
        $forms->controlnum              = Input::get('controlnum');
        $forms->date                = Input::get('date');
        $forms->churchname                  = ucwords(Input::get('churchname'));
        $forms->title                       = ucwords(Input::get('title'));
        $forms->pastorname                  = ucwords(Input::get('pastorname'));
        $forms->address                     = Input::get('address');
        $forms->contactnum                  = Input::get('contactnum');
        $forms->state                       = Input::get('state2');
        $forms->region                      = Input::get('region2');
        $forms->area                        = Input::get('area2');
        $forms->citytown                    = Input::get('city2');
        $forms->zipcode                     = Input::get('zipcode');
        $forms->tgjteachertraining          = Input::get('tgjteachertraining');
        $forms->localcontact            = ucwords(Input::get('localcontact'));
        $forms->tgjdatestart            = Input::get('tgjdatestart');
        $forms->tgjdateend              = Input::get('tgjdateend');
        $forms->tgjcourse           = Input::get('tgjcourse');
        $forms->childrengraduated           = Input::get('childrengraduated');
        $forms->childrenacceptjesus     = Input::get('childrenacceptjesus');
        $forms->howmanycomitted         = Input::get('howmanycomitted');
        $forms->recievedbibles          = Input::get('recievedbibles');
        $forms->descgradevent           = Input::get('descgradevent');
        $forms->whatwillyoudo           = Input::get('whatwillyoudo');
        $forms->pastortest          = Input::get('pastortest');
        $forms->teachertest             = Input::get('teachertest');
        $forms->childrentest            = Input::get('childrentest');
        $file                   = Input::file('file');
        $filename                   = $file->getClientOriginalName(); 
        $destinationPath                = 'uploads/'.Input::get('pda');
        $uploadSuccess              = Input::file('file')->move($destinationPath, $filename);
        $forms->docurl              = 'uploads/'.Input::get('pda').'/'.$filename;
        if( $uploadSuccess ) {
        $forms->save();
        //Session::flash('message', 'Successfully submitted form!');
        return Redirect::to('forms/create'); 
        Session::flash('message', 'Successfully submitted form!');

        } 
        else {
        return Response::json('error', 400);
        }
    }
}