在Python3 CGI脚本中，如何在POST中读取原始表单数据? [英] In a Python3 CGI script, how can I read the raw form data in a POST?

问题描述

是的，我知道cgi.FieldStorage，但是作为某种形式的无序词典，它不保留原始数据的顺序(请参见下面的证明).由于我希望将此数据与PayPal IPN一起使用，因此 PayPal文档很重要，上面写着:"...您必须按照收到内容的确切顺序将其寄回..."

Yes, I'm aware of cgi.FieldStorage, but, being some form of unordered dictionary, it does not preserve the order of the original data (see below for proof). Since I wish to use this data with PayPal IPN, order is important PayPal docs here, which say "...you must send back the contents in the exact order they were received..."

或者，os.environ.get('QUERY_STRING')看起来很完美，但是，它似乎仅适用于GET .示例代码:(myscript.py)

Alternatively, os.environ.get('QUERY_STRING') looks perfect, however, it seems to only work for a GET. Example code: (myscript.py)

#!/usr/bin/python3

import cgi, os

query = os.environ.get('QUERY_STRING') or 'no query'
print ("Content-type: text/plain\n\n")
print("query=" + query)
form = cgi.FieldStorage()
for key in form.keys():
   print("\n" + key + '=' + form.getvalue(key))

使用浏览器中的GET，例如(请注意，foo是 before ggg)

Works with a GET from the browser, e.g. (note that foo is before ggg)

http://example.com/myscript.py/foo=bar&ggg=3&aaa=bbb&zzz=qqq

返回

query=foo=bar&ggg=3&aaa=bbb&zzz=qqq
ggg=3
foo=bar   << note that foo now comes after ggg
aaa=bbb
zzz=qqq

但是，如果我使用Postman进行发布

However, if I use Postman to POST

POST /myscript.py HTTP/1.1
Host: example.com
Cache-Control: no-cache
Content-Type: application/x-www-form-urlencoded

foo=bar&ggg=3&aaa=bbb&zzz=qqq

它不返回查询字符串，并且，按预期，FormData没有保留顺序.

It returns no query string, and, as expected, the FormData did not preserve the order.

query=no query
ggg=3
foo=bar   << note that foo now comes after ggg
aaa=bbb
zzz=qqq

推荐答案

不确定为什么没有人回答.经过一番摸索，我发现该解决方案非常简单.这就是为什么没人愿意回答吗?

Not sure why nobody answered. After a little futzing I discovered that the solution is incredibly simple. Is that why nobody bothered to answer?

只需从stdin中读取:(这是Python3代码，不确定Python2是否会有所不同)

Just read from stdin: (this is Python3 code, not sure if Python2 would be any different)

query_string = sys.stdin.read()

有一个缺点:这与cgi.FieldStorage()不兼容，因为这也会尝试从stdin中读取.因此，如果您还希望一个好的字典来查找查询词，则有一个更简单的步骤:

There's one drawback: this is incompatible with cgi.FieldStorage(), since that will also try to read from stdin. So, if you also want a nice dictionary to look up query terms, there is one more simple step:

multiform = urllib.parse.parse_qs(query_string)

(类似于cgi.FieldStorage)返回 multimap ，因此名称为multiform.

which, much like cgi.FieldStorage, returns a multimap, hence the name multiform.

有关更多详细信息，我在此处通过博客发了言.

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