SilverStripe 3.1.x - Fetch Gravatar image before writing Member record

SS-Fetch-Gravatar

    public function onBeforeWrite(){

        if(!$this->ID or !$this->ImageID) {
            $gravatarEmailHash = md5(strtolower($this->Email));
            $gravatarURL = "http://www.gravatar.com/avatar/$gravatarEmailHash?d=404";
            $headers = get_headers($gravatarURL);
            if (strpos($headers[0],'200')) {

                //get the extension of the gravatar image - it will be either jpeg or png - we will need it later
                $ext = (strpos($headers[5], 'image/jpeg') === false) ? 'png' : 'jpeg';

                //get the image data
                $image = file_get_contents($gravatarURL);

                //write the image to the filesystem
                $folder = Folder::find_or_make('/Uploads/User-Profile-Pics/');
                file_put_contents(ASSETS_PATH . '/Uploads/User-Profile-Pics/'.$gravatarEmailHash.'.'.$ext, $image);

                //set our ProfileImage filename
                $filename = ASSETS_DIR . '/Uploads/User-Profile-Pics/'.$gravatarEmailHash.'.'.$ext;

                //Check if an Image record already exists for this Filename in the database.
                //If one already exists, use that image as our ProfileImage.
                if($profilePic = Image::get()->filter(array('Filename' => $filename))->first()) {
                    $this->ProfileImageID = $profilePic->ID;
                } else {
                    //create a new Image DataObject with the details of this new image and save record to database
                    $profilePic = new Image();
                    $profilePic->Filename = ASSETS_DIR . '/Uploads/User-Profile-Pics/'.$gravatarEmailHash.'.'.$ext;
                    $profilePic->Title = $gravatarEmailHash;
                    $profilePic->ParentID = $folder->ID;
                    $profilePic->write();

                    $this->ProfileImageID = $profilePic->ID;
                }


            } // OK
//            else if (strpos($headers[0],'404')) {
//                //echo "No Gravatar";
//            } // Not Found
        }

        parent::onBeforeWrite();
    }