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Claire bddd9ba36d
Add OMNIAUTH_ONLY environment variable to enforce externa log-in (#17288)
* Remove support for OAUTH_REDIRECT_AT_SIGN_IN

Fixes #15959

Introduced in #6540, OAUTH_REDIRECT_AT_SIGN_IN allowed skipping the log-in form
to instead redirect to the external OmniAuth login provider.

However, it did not prevent the log-in form on /about introduced by #10232 from
appearing, and completely broke with the introduction of #15228.

As I restoring that previous log-in flow without introducing a security
vulnerability may require extensive care and knowledge of how OmniAuth works,
this commit removes support for OAUTH_REDIRECT_AT_SIGN_IN instead for the time
being.

* Add OMNIAUTH_ONLY environment variable to enforce external log-in only

* Disable user registration when OMNIAUTH_ONLY is set to true

* Replace log-in links When OMNIAUTH_ONLY is set with exactly one OmniAuth provider
2022-01-23 15:52:58 +01:00

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- unless omniauth_only?
= simple_form_for(new_user, url: user_session_path, namespace: 'login') do |f|
.fields-group
- if use_seamless_external_login?
= f.input :email, placeholder: t('simple_form.labels.defaults.username_or_email'), input_html: { 'aria-label' => t('simple_form.labels.defaults.username_or_email') }, hint: false
- else
= f.input :email, placeholder: t('simple_form.labels.defaults.email'), input_html: { 'aria-label' => t('simple_form.labels.defaults.email') }, hint: false
= f.input :password, placeholder: t('simple_form.labels.defaults.password'), input_html: { 'aria-label' => t('simple_form.labels.defaults.password') }, hint: false
.actions
= f.button :button, t('auth.login'), type: :submit, class: 'button button-primary'
%p.hint.subtle-hint= link_to t('auth.trouble_logging_in'), new_user_password_path
- if Devise.mappings[:user].omniauthable? and User.omniauth_providers.any?
.simple_form.alternative-login
%h4= omniauth_only? ? t('auth.log_in_with') : t('auth.or_log_in_with')
.actions
- User.omniauth_providers.each do |provider|
= provider_sign_in_link(provider)