feat: add GET /lineitems/:id

Author: xchopin

src/main/java/org/apereo/openlrw/oneroster/endpoint/LineItemController.java

@@ -40,11 +40,16 @@ public LineItemController(LineItemService lineItemService, MongoClassMappingRepo
      * @throws IllegalArgumentException
      */
     @RequestMapping(method = RequestMethod.GET)
-    public Collection<MongoLineItem> getUsers(JwtAuthenticationToken token) throws IllegalArgumentException {
+    public Collection<MongoLineItem> getLineItems(JwtAuthenticationToken token) throws IllegalArgumentException {
         UserContext userContext = (UserContext) token.getPrincipal();
         return lineItemService.findAll(userContext.getTenantId(), userContext.getOrgId());
     }
 
+    @RequestMapping(value = "/{lineItemId:.+}", method = RequestMethod.GET)
+    public MongoLineItem getLineItem(JwtAuthenticationToken token, @PathVariable("lineItemId") final String lineItemId) throws IllegalArgumentException {
+        UserContext userContext = (UserContext) token.getPrincipal();
+        return lineItemService.findById(userContext.getTenantId(), userContext.getOrgId(), lineItemId);
+    }
 
     /**
      * POST /api/lineitems

src/main/java/org/apereo/openlrw/oneroster/service/LineItemService.java

@@ -65,6 +65,11 @@ public Collection<LineItem> getLineItemsForClass(final String tenantId, final St
     throw new LineItemNotFoundException("Line item not found");
   }
 
+  public MongoLineItem findById(final String tenantId, final String orgId, final String lineItemId) throws LineItemNotFoundException {
+    MongoLineItem mongoLineItem = mongoLineItemRepository.findByTenantIdAndOrgIdAndLineItemSourcedId(tenantId, orgId, lineItemId);
+    return mongoLineItem;
+  }
+
   public Collection<MongoLineItem> findAll(final String tenantId, final String orgId) throws IllegalArgumentException {
     if (StringUtils.isBlank(tenantId) || StringUtils.isBlank(orgId))
       throw new IllegalArgumentException();