Addresses #2048.
An earlier attempt (to wait for the config to load) ran into popup
blockers.
It would be nice to load the config statically with something like
Arunoda's fast-render. That said, even that's not good enough to allow
OAuth logins that bypass the popup blocker that aren't a result of a
user action, and for user actions it's easy enough to gate your login
button on `Accounts.loginServicesConfigured()`.
Longer term solutions include non-popup methods of OAuth login (see
Issue #438).
While this could mean that there's an indefinite wait before logging you
in, any condition where login configuration isn't being swiftly
published (after all, it should be cached) is a bigger problem.
`Accounts`/accounts-base is an awkward place to put this, because in
theory we wanted the packages like "twitter" to not depend on
accounts. But it turns out that service-configuration depends on
accounts anyway, so this isn't much of a regression. We can't put this
function in service-configuration because that package doesn't actually
do the subscription and make the ready handle. (Maybe oauth would be a
better place, but again, that's a package that doesn't currently depend
directly on accounts-base and would have to.)
Fixes#1911 and #2048.
database.
"Oauth" is renamed to "OAuth". "Oauth" is kept as an alias for
backwards compatibility.
README.md contains a sample description of how to generate and use the
oauthSecretKey, which might be incorporated into the wiki
documentation page.
