validators.py 文件源码

def url_validator(key, data, errors, context):
    ''' Checks that the provided value (if it is present) is a valid URL '''
    import urlparse
    import string

    model = context['model']
    session = context['session']

    url = data.get(key, None)
    if not url:
        return

    pieces = urlparse.urlparse(url)
    if all([pieces.scheme, pieces.netloc]) and \
       set(pieces.netloc) <= set(string.letters + string.digits + '-.') and \
       pieces.scheme in ['http', 'https']:
       return

    errors[key].append(_('Please provide a valid URL'))