class ImageHandler(BaseHandler):
	@tornado.web.authenticated
	def get(self):
            return self.render("image.html")

        @tornado.web.authenticated
        def post(self):
            user_id=self.current_user
            username = self.db.get("SELECT username from user WHERE id=%s", user_id)
            uploaded_image=self.request.files
            if imghdr.what('ignore', uploaded_image['avatar'][0]['body']) in ['jpeg','png']:
                avatar = Image.open(StringIO.StringIO(uploaded_image['avatar'][0]['body']))
                width, height = avatar.size
                            if width > height:
                                delta = width - height
                                left = int(delta/2)
                                upper = 0
                                right = height + left
                                lower = height
                            else:
                                delta = height - width
                                left = int(delta)/2
                                upper = 0
                                right = width
                                lower = width + upper
                            avatar_square = avatar.crop((left, upper, right, lower))
                            avatar_mini = copy.copy(avatar_square)
                            avatar_square.thumbnail((48,48))
                            avatar_mini.thumbnail((24,24))
                            filename = username['username']+'.jpg'
                            minifilename = username['username']+'_mini'+'.jpg'
                            path_to_save = os.path.join('static', 'avatars', filename)
                            path_to_mininail = os.path.join('static', 'avatars', minifilename)
                            avatar_square.save(path_to_save)
                            avatar_mini.save(path_to_mininail)
                            self.db.execute("UPDATE user SET user_thumbnail=%s, user_mininail=%s WHERE id=%s", path_to_save, path_to_mininail, user_id)
                            return self.write("Successfully uploaded the image")
            else: return self.write("file format is not accepted")