http dav support

[Robey Pointer]

On 14 Nov 2005, at 16:17, John A Meinel wrote:

> Robey Pointer wrote:
>> Really cool/interesting summary of UBZ, thanks Aaron. :)
>>
>> Reading it brought up this question:  Is anyone working on or
>> investigating HTTP DAV support?
>>
>> I did a quick google and it looks like there's a standard (tiny!)  
>> davlib
>> module out there for python.  Debian even has it as an individual
>> package.  So I think it might actually be pretty simple to get DAV
>> working, but I don't want to step on anyone's toes if someone else is
>> already playing with it, since I know very little about DAV.
>
> I don't think anyone has looked into it yet. There are a few people  
> who
> claim it is a must for them.
>
> If you want to give davlib a look, and implement a DavTransport,  
> similar
> to the SftpTransport, that would be nice.
>
> We might have to work out some policy, since we would want people to
> still have access to read-only http access, even if they don't have
> davlib installed, but it would be nice to be able to upgrade them to
> write-access if the remote location supports it.
>
> As far as I know, read-only webdav is just plain http. It is only when
> you go to write that you need webdav.
> So maybe we could try to load davlib, and if it loads, then we have
> implementations for the write() functions in HttpTransport. If it  
> fails
> to load, then we just complain that you must have davlib installed to
> have write support.
>
> Probably this is easiest done to start with by creating a plugin, and
> having it inherit from http transport, and then register itself as the
> http handler. (or only register itself if davlib is available).

I agree that it should really be integrated with the existing HTTP  
support.  And AFAIK you're correct that read-only DAV support is just  
HTTP as usual.

I don't think we'd even need to add a dependency to davlib.  I looked  
at the one I found on the web here:

	http://www.lyra.org/greg/python/davlib.py

and compared that to the one in debian, and they're exactly the same  
except for a single import line (davlib used to depend on another  
module, which is now part of python since 2.3).  The entire file is  
300 lines so we could just drop a copy into the bzr tree.

I'll play with it this week and see how it shakes out.  I'm  
moderately optimistic that it may be a minor change.

robey

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