python简单的wsgi文件上传脚本-有什么问题? [英] python simple wsgi file upload script - What is wrong?
问题描述
import os, cgi
#self_hosting script
tags = """<form enctype="multipart/form-data" action="save_file.py" method="post">
<p>File: <input type="file" name="file"></p>
<p><input type="submit" value="Upload"></p>
</form>"""
def Request(environ, start_response):
# use cgi module to read data
form = cgi.FieldStorage(fp=environ['wsgi.input'], environ=environ, keep_blank_values=True)
try:
fileitem = form['file']
except KeyError:
fileitem = None
if fileitem and fileitem.file:
fn = os.path.basename(fileitem.filename)
with open(fn, 'wb') as f:
data = fileitem.file.read(1024)
while data:
f.write(data)
data = fileitem.file.read(1024)
message = 'The file "' + fn + '" was uploaded successfully'
else :
message = 'please upload a file.'
start_response('200 OK', [('Content-type','text/html')])
return [message + "<br / >" + tags]
上面是我的python wsgi脚本,它接收文件并将其写入磁盘.但是,执行后(选择了文件):
Above is my python wsgi script that receives a file and writes it to the disk. However, upon executing (with a file selected):
内部服务器错误 处理此请求时发生错误. 请求处理程序失败
Internal Server Error An error occurred processing this request. Request handler failed
Traceback (most recent call last):
File "C:\Python26\Http\Isapi.py", line 110, in Request
return Handler(Name)
File "C:\Python26\Http\Isapi.py", line 93, in
"/apps/py/" : lambda P: RunWSGIWrapper(P),
File "C:\Python26\Http\Isapi.py", line 86, in RunWSGIWrapper
return RunWSGI(ScriptHandlers[Path])
File "C:\Python26\Http\WSGI.py", line 155, in RunWSGI
Result = Application(Environ, StartResponse)
File "\\?\C:\Python26\html\save_file.py", line 13, in Request
form = cgi.FieldStorage(fp=environ['wsgi.input'], environ=environ, keep_blank_values=True)
File "C:\Python26\Lib\cgi.py", line 496, in __init__
self.read_multi(environ, keep_blank_values, strict_parsing)
File "C:\Python26\Lib\cgi.py", line 620, in read_multi
environ, keep_blank_values, strict_parsing)
File "C:\Python26\Lib\cgi.py", line 498, in __init__
self.read_single()
File "C:\Python26\Lib\cgi.py", line 635, in read_single
self.read_lines()
File "C:\Python26\Lib\cgi.py", line 657, in read_lines
self.read_lines_to_outerboundary()
File "C:\Python26\Lib\cgi.py", line 685, in read_lines_to_outerboundary
line = self.fp.readline(1<<16)
AttributeError: 'module' object has no attribute 'readline'
在wsgi和cgi模块上相当愚蠢,我现在不知道要进步什么.有任何线索吗?
Being pretty daft at wsgi and cgi module I have no idea to progress at this moment. any clues?
推荐答案
environ['wsgi.input']
是类似于对象的流.您首先需要将其缓存到类似对象的文件中,例如:tempfile.TemporaryFile
或StringIO
(在python3中为io.BytesIO
):
environ['wsgi.input']
is a stream like object. You need to cache it firstly to file like object, eg: tempfile.TemporaryFile
or StringIO
(io.BytesIO
in python3):
from tempfile import TemporaryFile
import os, cgi
def read(environ):
length = int(environ.get('CONTENT_LENGTH', 0))
stream = environ['wsgi.input']
body = TemporaryFile(mode='w+b')
while length > 0:
part = stream.read(min(length, 1024*200)) # 200KB buffer size
if not part: break
body.write(part)
length -= len(part)
body.seek(0)
environ['wsgi.input'] = body
return body
def Request(environ, start_response):
# use cgi module to read data
body = read(environ)
form = cgi.FieldStorage(fp=body, environ=environ, keep_blank_values=True)
# rest of your code
出于安全原因,请考虑屏蔽传递给FieldStorage
For safety reason consider to mask environ
value which you pass to FieldStorage
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