Co-authored-by: Bastien Le Querrec <blq@laquadrature.net>

If your IDP transmits `cn=groupname,cn=groups,dc=example,dc=com` you can set this to true to use only `groupname`. This is useful if you want to keep the standard group name length of Discourse (20 characters).

Co-authored-by: Andreas Teuber <andreas.teuber@passiv.de>

Our hosted sites running in stable branch have issues with `rexml` gem and returning "missing gem" error.

Recent commit 9d836281 is not compatible with old versions of Discourse.

We started seeing [this error](https://github.com/onelogin/ruby-saml/issues/577) on some of our sites, which has been fixed on 1.12.1.

Now we can sync or create user fields based on the new `saml_user_field_statements` environment variable's mapping.

These were removed from core in https://github.com/discourse/discourse/commit/d2bceff133ac152678a1407d45fea260a0fe8536

In case the user isn't assigned to any (non-automatic) group, the user
wasn't added.

This makes sure the saml_request can only insert strings into the HTML
form.

* Support for GlobalSetting.saml_base_url

* Push file with class method...

Co-authored-by: Richard <richard@discoursehosting.com>

* RFC: groups full sync

* Update lib/saml_authenticator.rb

Co-Authored-By: Robin Ward <robin.ward@gmail.com>

* Update lib/saml_authenticator.rb

Co-Authored-By: Robin Ward <robin.ward@gmail.com>

* Update README.md

Co-Authored-By: Robin Ward <robin.ward@gmail.com>

c6c05a62

The name of the attribute that contains the user's groups should be changeable.
Ipsilon IdP for example uses just 'groups', and that is hardcoded.