guess the mime type of a local file.
Change suggested by Sjoerd (with different implementation):
when retrieve() creates a temporary file, preserve the suffix.
Corrollary of the first change:
also return the mime type of a local file in retrieve().
most recently opened URL in self.openedurl of the URLopener instance.
This doesn't really work if multiple threads share the same opener
instance!
Fix: openedurl was actually simply the type prefix (e.g. "http:")
followed by the rest of the URL; since the rest of the URL is
available and the type is effectively determined by where you are in
the code, I can reconstruct the full URL easily, e.g. "http:" + url.
retrieving files from the same host and directory, you had to close
the previous instance before opening a new one; and retrieving a
non-existent file would return an empty file. (The latter fix relies
on maybe an undocumented property of NLST -- NLST of a file returns
just that file, while NLST of a non-existent file returns nothing. A
side effect, unfortunately, seems to be that now ftp-retrieving an
*empty* directory may fail. Ah well.)
Sjoerd: add separate administration of temporary files created y
URLopener.retrieve() so cleanup can properly remove them. The old
code removed everything in tempcache which was a bad idea if the user
had passed a non-temp file into it. (I added a line to delete the
tempcache in cleanup() -- it still seems to make sense.)
Jack: in basejoin(), interpret relative paths starting in "../". This
is necessary if the server uses symbolic links.
that multiple retrievals using the same connection will work.
This leaves open the more general problem that after
f = urlopen("ftp://...")
f must be closed before another retrieval from the same host should be
attempted.
- basejoin('some/url', '#name') would strip the last component of
some/url and resturn some/#name.
- basejoin('file.html', 'relative/path') would return something like
file:/relative/path, making a relative path into an absolute one.
These bugs are fixed by some drastic changes. No scheme is added when
none is present (i.e. it works as replacement for posix.joinpath).
If a scheme is present in the second argument, it is returned
unprocessed. No hostname are added in this case. If no scheme is
present, the scheme of the first argument, if present, is used.
The algorithm is commented profusely.
Also fixed a typo in a comment.
Guido van Rossum
Fred Drake
Jack Jansen
Sjoerd Mullender