Query WebFinger for OIDC issuer before fetching /.well-known/openid-configuration
#776
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Currently, the OpenCloud client relies on the
PROXY_OIDC_REWRITE_WELLKNOWNhack to discover the IDP's configuration (except for the initial login, see also #771).To be able to get rid of this workaround (see also owncloud/ocis#11542 for problems with this approach), this PR changes the
OAuth::fetchWellKnownmethod to get the issuer's location via WebFinger before fetching the issuer's/.well-known/openid-configuration.These changes also make it possible to get additional data from the WebFinger as required for #246 (comment), for example.
This PR depends on my previous PR #771, the additional changes are in 31745c4.