All changes are supposed to be persistent. This simplifies the tile
caching code quite a lot.
The TileCache object no longer needs to keep any state whether the
document is being edited or whether it has been modified without
saving etc.
Update the modtime.txt file after saving the document. Otherwise the
tile cache would wrongly be considered invalid next time.
As a sanity check, we put a flag file 'unsaved.txt' into the cache
directory whenever we get a callback that indicates the document has
been modified, and remove it when the document is saved. If the flag
file is present when we take an existing tile cache into use, we can't
trust it.
Even after these changes, we still don't use an existing tile cache as
much (or at all?) as we could, though. The INVALIDATE_TILES EMPTY
callback that LO does early on in a conection causes us to remove all
cached tiles...
Since auto-discovery is problematic, this patch implements
support for both regex patterned hostnames/IPs to allow,
and those to block/deny.
A hostname/IP must be both allowed, and not denied, to
be accepted.
By setting ranges of allowed hostnames/IPs, and others
to block/deny, an admin can configure Online with
great flexibility.
Defaults updated with same values, but not exhaustive.
Change-Id: Iedfcafe41d07d905b549fb450c3fe625ad44599e
Reviewed-on: https://gerrit.libreoffice.org/24233
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
At least, that is the value of the num_prespawn_children element in
the loolwsd.xml as shipped. But maybe that is not what is meant with
"default"? It is unclear to me what the "default" attribute means.
