Implement a username picker for synapse (#8942)

The final part (for now) of my work to implement a username picker in synapse itself. The idea is that we allow
`UsernameMappingProvider`s to return `localpart=None`, in which case, rather than redirecting the browser
back to the client, we redirect to a username-picker resource, which allows the user to enter a username.
We *then* complete the SSO flow (including doing the client permission checks).

The static resources for the username picker itself (in 
https://github.com/matrix-org/synapse/tree/rav/username_picker/synapse/res/username_picker)
are essentially lifted wholesale from
https://github.com/matrix-org/matrix-synapse-saml-mozilla/tree/master/matrix_synapse_saml_mozilla/res. 
As the comment says, we might want to think about making them customisable, but that can be a follow-up. 

Fixes #8876.
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Richard van der Hoff 2020-12-18 14:19:46 +00:00 committed by GitHub
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@ -203,9 +203,10 @@ class OIDCConfig(Config):
# * user: The claims returned by the UserInfo Endpoint and/or in the ID
# Token
#
# This must be configured if using the default mapping provider.
# If this is not set, the user will be prompted to choose their
# own username.
#
localpart_template: "{{{{ user.preferred_username }}}}"
#localpart_template: "{{{{ user.preferred_username }}}}"
# Jinja2 template for the display name to set on first login.
#