code: public Map<String, String> getUriVariablesForAddFile(BullhornEntityInfo entityInfo, Integer entityId, String externalId, FileParams params) {
  		if (params == null) {
  			params = ParamFactory.fileParams();
  		}
  
  		Map<String, String> uriVariables = params.getParameterMap();
  
  		String bhRestToken = bullhornApiRest.getBhRestToken();
  		uriVariables.put(BH_REST_TOKEN, bhRestToken);
  		uriVariables.put(EXTERNAL_ID, externalId);
  		uriVariables.put(ENTITY_TYPE, entityInfo.getName());
  		uriVariables.put(ENTITY_ID, entityId.toString());
  		return uriVariables;
  	}
docs: Returns the uri variables needed for adding a file
  
  @param entityInfo
  @param entityId
  @param externalId
  @param params
  @return