**As** an admin
**I want to** configure an external xwiki instance as a wiki integration
**so that** this wiki can be used within projects 

**Acceptance criteria**

* A wiki provider of type XWiki must be creatable, editable and delable.

* The admin must be able to set a name for the xwiki instance.

* The admin must be able to connect to a wiki on an xwiki instance by URL.

* If the URL is invalid or doesn't point to a valid xwiki instance, a validation error is shown.

* Begin of the insertion~~TheEnd of the insertion Begin of the deletion TheEnd of the deletion admin must be able to set a xwiki instance Begin of the insertionidentifier.~~End of the insertion Begin of the deletion identifier.End of the deletion

* Begin of the insertion~~TheEnd of the insertion Begin of the deletion TheEnd of the deletion admin must be able to copy an openproject instance Begin of the insertionidentifier~~

* The XWiki provider instance created must have the universalEnd of the insertion identifier Begin of the insertionfetched and saved.End of the insertion

* The admin must be able to configure an authentication strategy.

* bidirectional OAuth2

* Begin of the insertion~~common OIDC~~End of the insertion Begin of the deletion common OIDCEnd of the deletion

* Begin of the insertion~~OIDCEnd of the insertion Begin of the deletion OIDCEnd of the deletion must work with and without token Begin of the insertionexchange~~End of the insertion Begin of the deletion exchangeEnd of the deletion