Turns out, all we have to do is rewrite the URL to https://. I'm
surprised this works, but I don't see any problems with it. I tested
subscribing to webcal://www.gnome.org/start/unstable/schedule.ics.
See also: #481
Currently, when the user enters an invalid URL -- a URL that does not
pass SoupURI's URI format validation -- then we set the error style
class on the URL entry to turn the border of the entry red. For example,
if I try to enter "dog" then GNOME Calendar catches this and flags the
entry as red.
But there are some problems.
First of all, GNOME Calendar doesn't do anything to prevent users from
entering URLs that are syntatically valid but not usable as calendars.
The code knows whether the URL was successfully parsed as a calendar
file, it just doesn't do anything with this information. So there is no
red warning if I try to use https://example.com as a calendar, even
though the dialog knows that it didn't work.
Secondly, GNOME Calendar allows pressing the Add button even if the URL
entry contains invalid input, but only if the Calendar Name has been
entered. The dialog thinks: "if I have a name, but not a valid URL, then
the user wants to create a new, empty local calendar!" But this is not
right. If the user has typed anything in the URL entry, then the goal is
to import a new calendar, not to create a new one.
This commit changes set_url_entry_error() into update_url_entry_state(),
and gives it responsibility for updating the add button sensitivity and
URL entry pulsing in addition to the URL entry style class, solving both
of the above problems.
As a side effect, this also closes a race window where the Add button
remains sensitive for half a second after typing new text in the URL entry.
At this point, we don't yet know whether the URL is valid, because we
wait half a second before validating the URL, so we shouldn't allow the
user to activate the Add button during this race window.
Fixes#481
This check passes if the URI is empty. Normally this callback only runs
when there is text in the URL entry, but there is a race window where
the user could delete it first. (Passing NULL to a SoupURI creates an
invalid non-NULL empty URI that can be filled in later.)
The new discoverer is a vast improvement over the code
that use used to have here. Right now, we fail to use
Soup to detect the URL, and that's been reported multiple
times already.
Use the new web discoverer code, and adjust the UI to
match the new code. Namely, use a GtkPopover to show
the credentials widget.
Fixes#380
Michael Catanzaro