写入 NamedTemporaryFile 静默失败；将 Curl cookie jar 转换为

Question

我正在尝试获取 Curl 吐出的 Netscape HTTP Cookie 文件并将其转换为 Requests 库可以使用的 Cookiejar。我netscapeCookieString在我的 Python 脚本中有一个变量，它看起来像：

# Netscape HTTP Cookie File

# https://curl.haxx.se/docs/http-cookies.html

# This file was generated by libcurl! Edit at your own risk.

.miami.edu  TRUE    /   TRUE    0   PS_LASTSITE https://canelink.miami.edu/psc/PUMI2J/

由于我不想自己解析 cookie 文件，所以我想使用cookielib. 遗憾的是，这意味着我必须写入磁盘，因为cookielib.MozillaCookieJar()不会将字符串作为输入：它必须采用文件。

所以我正在使用NamedTemporaryFile（无法开始SpooledTemporaryFile工作；如果可能的话，再次想在内存中完成所有这些操作）。

tempCookieFile = tempfile.NamedTemporaryFile()

# now take the contents of the cookie string and put it into this in memory file

# that cookielib will read from. There are a couple quirks though. 

for line in netscapeCookieString.splitlines():

    # cookielib doesn't know how to handle httpOnly cookies correctly

    # so we have to do some pre-processing to make sure they make it into

    # the cookielib. Basically just removing the httpOnly prefix which is honestly

    # an abuse of the RFC in the first place. note: httpOnly actually refers to

    # cookies that javascript can't access, as in only http protocol can

    # access them, it has nothing to do with http vs https. it's purely 

    # to protect against XSS a bit better. These cookies may actually end up

    # being the most critical of all cookies in a given set.

    # https://stackoverflow.com/a/53384267/2611730

    if line.startswith("#HttpOnly_"):

        # this is actually how the curl library removes the httpOnly, by doing length

        line = line[len("#HttpOnly_"):]

    tempCookieFile.write(line)

tempCookieFile.flush()

但问题是，这是行不通的！

print tempCookieFile.read()打印一个空行。

因此，pprint.pprint(cookieJar)打印一个空的饼干罐。

我怎样才能真正写信给 a NamedTemporaryFile？

Answer 1

写入文件后，指向该文件的指针指向写入数据之后的位置（在您的文件末尾），因此当您读取它时返回一个空字符串（文件末尾后没有更多数据）只是寻找 0读之前>>> import tempfile>>> tempCookieFile = tempfile.NamedTemporaryFile()>>> tempCookieFile.write("hey")>>> tempCookieFile.seek(0)>>> print(tempCookieFile.read())