first go at recursive group memberships

spelling fixes

improved the philosophy document

upped version

remove basically unused filter converter

remove commented default methods

disable logout for SSO setups

first go at SSO

This basically copies the functionality from authAD

Added philosophy document

proper german group name

another workaround for preg quoting

added missing metadata

avoid duplicating defaults

We need the defaults in the Client for better testability, but instead
of defining them twice, we can simply load the defaults file ourselves.

make the primary group configurable

Because the Domain Users group can be localized, this makes it
configurable. The authAD library had a config to use "real" primary
groups where it would look up t

make the primary group configurable

Because the Domain Users group can be localized, this makes it
configurable. The authAD library had a config to use "real" primary
groups where it would look up the primary group by calculating the SID
and doing another check. We could copy that mechanism if needed later
on.

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group handling improvements

* properly handle uppercase group names
* use constants for filter types
* properly handle Domain Users lookups

test spaced group

improve logging mechanisms

Makes use of the new error logging mechanism when running on master,
uses allowdebug to print end user messages.

rework username handling

Background Info
---------------

Active Directory has at least three different way how users are
identified:

1) sAMAccountName: user

The sAMAccountName is what users usual

rework username handling

Background Info
---------------

Active Directory has at least three different way how users are
identified:

1) sAMAccountName: user

The sAMAccountName is what users usually know as their username. It's
what they usually log in with on their workstation. It is however
lacking the actual domain to which to login. Typically it is prefixed by
a netbios domain for login. Eg. DOMAIN\user

Note: The samaccount name is also limited to 20 characters because of
legacy reasons.

2) userPrincipalName: user@domain.something

The userPrincipalName contains something that looks like a domain. But
it may be actually different to the Domain managed by the AD. Because
of... reasons? See https://serverfault.com/a/928116

3) bind ID: user@domain.ext

Now, loggin in (eg. doing a LDAP bind) can use different mechanisms. The
userPrincipalName works, user@domain (different from the UPN) should
work too.

DokuWiki requirements:
----------------------

In DokuWiki we need a unique username, that stays the same on every
login. (logging in with or without the domain part should identify the
same user).

We also need this name to be usable to run additional LDAP queries. Eg.
find groups with this user name.

We also want users to be able to login without having to type the domain
part.

This patch
----------

So with this patch we use the samaccount name to identify a user. For
logging in, we add the configured account suffix (aka the domain). After
that we only use the domainless user name everywhere.

In a future update we may (re)introduce the multidomain support from
authAD. When we do, this will probably force us to use the suffix part
in the usernames to different different domain users (something the
authAD plugin doesn't do which is probably wrong). But for most people
the single suffix approach should be fine.

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only fetch the attributes we need

this should lower the memory requirements and might speed things up a
bit

allow fetching of additional user attributes

Currently we reuqest all attributes from the server and only filter
later. This needs fixing.

make page size configurable

The default of 1000 will quickly exhaust the memory available on typical
PHP setups. This lowers it to 150 which should be fine as is for
virtuallly everyone.

clean up group filter strings

As mentioned in splitbrain/dokuwiki#3028 the data passed in filters is
ill defined currently. This is a very very simple workaround for strings
passed by cosmocode/grou

clean up group filter strings

As mentioned in splitbrain/dokuwiki#3028 the data passed in filters is
ill defined currently. This is a very very simple workaround for strings
passed by cosmocode/groupusers

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fix admin user access

give hint on failing admin access

dependency update