Django XML无法加载外部实体

Question

我收到一个名为xml的参数，其中包含一个xml文档。这就是我试图...

from lxml.cssselect import CSSSelector, etree 
from lxml.etree import fromstring 

if request.POST: 

    parser = etree.XMLParser(ns_clean=True, recover=True) 
    h = etree.parse(request.POST['xml'], parser) 

    return HttpResponse(h) 

，但我得到这个错误：

[Fri Apr 05 09:50:13 2013] [error] IOError: Error reading file '<?xml version="1.0" encoding="ISO-8859-1"?> 
[Fri Apr 05 09:50:13 2013] [error] <delivery_receipt> 
[Fri Apr 05 09:50:13 2013] [error]  <version>1.1</version> 
[Fri Apr 05 09:50:13 2013] [error]  <msisdn>447777111111</msisdn> 
[Fri Apr 05 09:50:13 2013] [error]  <submission_ref>123456789</submission_ref> 
[Fri Apr 05 09:50:13 2013] [error]  <status>Delivered</status> 
[Fri Apr 05 09:50:13 2013] [error]  <reason>4</reason> 
[Fri Apr 05 09:50:13 2013] [error]  <gmt_timestamp>20130405095100</gmt_timestamp> 
[Fri Apr 05 09:50:13 2013] [error]  <retry>0</retry> 
[Fri Apr 05 09:50:13 2013] [error] </delivery_receipt>': failed to load external entity "<?xml version="1.0" encoding="ISO-8859-1"?> 
[Fri Apr 05 09:50:13 2013] [error] <delivery_receipt> 
[Fri Apr 05 09:50:13 2013] [error]  <version>1.1</version> 
[Fri Apr 05 09:50:13 2013] [error]  <msisdn>447777111111</msisdn> 
[Fri Apr 05 09:50:13 2013] [error]  <submission_ref>123456789</submission_ref> 

等

什么想法？谢谢:)

Answer 1

request.POST默认返回unicode字符串。您遇到的下一个问题与您供应的编码与您提供的文档中声明的编码不匹配有关。

doc = request.POST.get('xml','') 
if not doc: 
    raise Exception() 
h = etree.XML(doc.encode('ascii'), parser) 

Answer 2

etree.parse需要文件名（或文件对象）。没有名为<all your xml>的文件。

您需要的XML提要解析器：

from lxml.cssselect import CSSSelector, etree 
from lxml.etree import fromstring 

if request.POST: 

    parser = etree.XMLParser(ns_clean=True, recover=True) 
    parser.feed(request.POST['xml']) 
    h = parser.close() 
    ... 

或者使用fromstring或XML功能。

h = fromstring(request.POST['xml'], parser=parser) 

或

h = etree.XML(request.POST['xml'], parser=parser) 

The lxml.etree tutorial