Attribute mapper for meeting-user from SAML

[rrenkert]

The current implementation for the saml attribute mapping only contains a mapping for user data and a simple static meeting mapper.
This should be completed with a conditional mapping for meeting_user attributes.

The following JSON contains an example for this mapping:

...,
"member_number": "member_number",
"meeting_mappers": [{
   "name": "Mapper-Name", //optional
   "external_id": "M2025", // required
   "allow_update": "false" // default: true, optional
   "conditions": [{ // and per item 
       "attribute": "membernumber", // is a key in saml data
       "condition": "1426\d{4,6}$" //regex
   }, { // "and" per item
       "attribute": "function",
       "condition": "board"
   }], //all conditions && and optional
   "mappings": {    
       "groups": [{ // optional, default "standard"
           "attribute": "membership", // has priority 
           "default": "admin, standard" // default as fallback if value is empty
       }],
       "structure_levels": [{
           "attribute": "ovname", // 
           "default": "struct1, struct2",
       }],
       "number": {"attribute": "mglnumber"}
       "comment": {
           "attribute": "idp_comment",
           "default": "Group set via SSO"},
       "vote_weight": {
           "attribute": "vote",
           "default":"1",
       },
       "present": {
           "attribute": "present_key",
           "default":"True",
       },
   }
}]

Field description:

Attribut	Typ	Value	Komentar
name	string	text	for identification
member_number	string	ExtID	user field
allow_update	bool	true/false	true: data will be overwritten
external_id	string	ExtID of meeting	The main meeting mapping
attribute	string	saml-attribute	Attribute from IdP that will be used. coma seperated List
condition	string	RegEx	evaluates to true: the attributes will be used for the user; false: the mapper will be skipped
default	string		coma seperated List
mappings			the mappings for user attributes inside the meeting (meeting_user fields)
number	attribute, string	participant numer	meeting_user field
groups	attribute + default, string	ExtIDs of groups in meeting	meeting_user field
structure_level	attribute + default, string	structure levels	meeting_user field, format analog to Groups
comment	attribute + default, string	internal comment	meeting_user field
vote_weight	attribute + default, float	Stimmgewicht	meeting_user field
present	attribute + default, bool	Anwesenheit	meeting_user field

When multiple mappings match structure levels and groups are treated additively and number, vote_weight, comment and present are used from the last matching mapper.