python - 如何避免在Bottle Python Web框架中转义html字符？

问题

如何防止Bottle - Python Web Framework中的字符转义？

背景

我正在Bottle(python)中制作一个歌曲歌词网络应用程序，并且在将所有数据插入数据库之前都在测试所有数据是否正确，因此，到目前为止，我基本上拥有一种形式，该形式具有“歌曲名称”，“艺术家” ”，“歌词”(在文本区域中)，仅此而已。

提交表单时，它会加载一个包含上述三个输入值(歌曲，艺术家和歌词)的页面，并且一切都按预期工作，但是歌词的html被转义了(在将歌词发送到模板之前，我将所有\n替换为<br>)。

因此，我从this tutorial from bottlepy.org进行了研究，发现Bottle会转义html标记以防止XSS攻击，您可以通过添加“!”将其禁用。在变量名之前，真棒!我找到了解决方案，但是...当我尝试使用它时，抛出了一个错误:

错误-Screenshot of Error on computer

Exception:

SyntaxError('invalid syntax', ('H:\\Server\\htdocs\\letras\\prueba.tpl', 4, 27, "u'<div>Letra: ', _escape( !letra['letra'] ), u'</div>'])\n"))

Traceback (most recent call last):
    File "H:\Server\htdocs\letras\bottle.py", line 764, in _handle
      return route.call(**args)
    File "H:\Server\htdocs\letras\bottle.py", line 1575, in wrapper
      rv = callback(*a, **ka)
    File "index.py", line 41, in guardar_letra
      return template('prueba.tpl', letra = data)
    File "H:\Server\htdocs\letras\bottle.py", line 3117, in template
      return TEMPLATES[tplid].render(kwargs)
    File "H:\Server\htdocs\letras\bottle.py", line 3090, in render
      self.execute(stdout, kwargs)
    File "H:\Server\htdocs\letras\bottle.py", line 3078, in execute
      eval(self.co, env)
    File "H:\Server\htdocs\letras\bottle.py", line 185, in __get__
      value = obj.__dict__[self.func.__name__] = self.func(obj)
    File "H:\Server\htdocs\letras\bottle.py", line 2977, in co
      return compile(self.code, self.filename or '<string>', 'exec')
    File "H:\Server\htdocs\letras\prueba.tpl", line 4
      u'<div>Letra: ', _escape( !letra['letra'] ), u'</div>'])
                                ^
  SyntaxError: invalid syntax

index.py-gist on github

from bottle import Bottle, route, run, template, static_file, get, post, request, response
from passlib.hash import sha256_crypt
import MySQLdb as mdb
import time
import re

@get('/enviar')
def enviar_letra():
    return template('enviar_letra.tpl')

@post('/enviar')
def guardar_letra():
    titulo = request.forms.get('titulo').capitalize() # Gets the song title from the form
    artista = request.forms.get('artista') # Gets the artist
    letra = request.forms.get('letra') # Gets the lyrics
    fecha_envio = time.strftime('%Y-%m-%d %H:%M:%S') # Date the lyrics were sent
    titulo = re.sub('[^\w|!|\s|\.|,]', '', titulo) # I delete every character except: words, exclamation, spaces, dots, commas
    url = titulo + "-" + artista # concatenate the song's title and the artist name to make a nice url
    url = re.sub('\W+|_', '-', url).lower() # lower all the characters from the url
    url = url.strip("-") # strips "-" at the beginning and the end
    letra = letra.replace("\n", "<br>") # replaces \n from the lyrics text area with <br>
    data = { "titulo": titulo, "artista": artista, "letra": letra, "url": url, "Fecha_envio": fecha_envio } # song dictionary
    return template('prueba.tpl', letra = data) # loads prueba.tpl template and send "data" dictionary as "letra" (letra is lyric in spanish)

run(host='localhost', port=8080, debug=True)

HTML模板-gist on github

<h1>Letra de {{ letra['titulo'] }}</h1>
<h2>Por: {{ letra['artista'] }}</h2>
<div>Fecha: {{ letra['Fecha_envio'] }}</div>
<div>Letra: {{ !letra['letra'] }}</div>

如果让Bottle使我的歌词html逸出，这是它的工作方式/外观(请注意<br>如何以纯文本形式显示):

http://i.stack.imgur.com/fxz7o.png

最后，这就是它的外观

http://i.stack.imgur.com/6b58J.png

最佳答案

您需要在瓶的{{开头之后放置一个感叹号，以便识别它:

<div>Letra: {{! letra['letra'] }}</div>

最好，为了安全起见，您希望完全省略那里的空格:

<div>Letra: {{!letra['letra']}}</div>

关于python - 如何避免在Bottle Python Web框架中转义html字符？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/17248836/