[SHIBUI-1031]

Added an endpoint to get supported roles.

backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/controller/ConfigurationController.java

@@ -1,12 +1,16 @@
 package edu.internet2.tier.shibboleth.admin.ui.controller;
 
 import edu.internet2.tier.shibboleth.admin.ui.configuration.CustomPropertiesConfiguration;
+import edu.internet2.tier.shibboleth.admin.ui.security.model.Role;
+import edu.internet2.tier.shibboleth.admin.ui.security.repository.RoleRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 
+import java.util.stream.Collectors;
+
 /**
  * @author Bill Smith (wsmith@unicon.net)
  */
@@ -17,8 +21,16 @@ public class ConfigurationController {
     @Autowired
     CustomPropertiesConfiguration customPropertiesConfiguration;
 
+    @Autowired
+    RoleRepository roleRepository;
+
     @GetMapping(value = "/customAttributes")
     public ResponseEntity<?> getCustomAttributes() {
         return ResponseEntity.ok(customPropertiesConfiguration.getAttributes());
     }
+
+    @GetMapping(value = "/supportedRoles")
+    public ResponseEntity<?> getSupportedRoles() {
+        return ResponseEntity.ok(roleRepository.findAll().stream().map(Role::getName).collect(Collectors.toList()));
+    }
 }