fixes igniterealtime#146: Limit URI template match for MUC affiliation

The fix for issue igniterealtime#141 introduces a template to replace four distinct URL patterns:
- `/restapi/v1/chatrooms/{roomName}/owners`
- `/restapi/v1/chatrooms/{roomName}/admins`
- `/restapi/v1/chatrooms/{roomName}/members`
- `/restapi/v1/chatrooms/{roomName}/outcasts`

got replaced by

- `/restapi/v1/chatrooms/{roomName}/{affiliation}`

Sadly, this template matches more than just those four. URLs like these also get caught, making them misbehave:

- `/restapi/v1/chatrooms/{roomName}/chathistory`
- `/restapi/v1/chatrooms/{roomName}/occupants`
- `/restapi/v1/chatrooms/{roomName}/participants`
- `/restapi/v1/chatrooms/{roomName}/invite`

This commit fixes the problem by applying a regular expression to the `{affiliation}` template, requiring it to match one of four distinct options.

changelog.html

@@ -44,6 +44,11 @@ <h1>
 REST API Plugin Changelog
 </h1>
 
+<p><b>1.9.1</b> (tbd)</p>
+<ul>
+    <li>[<a href='https://github.com/igniterealtime/openfire-restAPI-plugin/issues/146'>#146</a>] - Chatroom 'affiliation' URL template clash</li>
+</ul>
+
 <p><b>1.9.0</b> August 4, 2022</p>
 <ul>
     <li>[<a href='https://github.com/igniterealtime/openfire-restAPI-plugin/issues/141'>#141</a>] - Remove boilerplate code for managing MUC room affiliations</li>

src/java/org/jivesoftware/openfire/plugin/rest/service/MUCRoomAffiliationsService.java

@@ -39,7 +39,7 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
-@Path("restapi/v1/chatrooms/{roomName}/{affiliation}")
+@Path("restapi/v1/chatrooms/{roomName}/{affiliation: (admins|members|outcasts|owners)}")
 @Tag(name = "Chat room", description = "Managing Multi-User chat rooms.")
 public class MUCRoomAffiliationsService
 {