001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau.rest.vars; 014 015import org.apache.juneau.rest.*; 016import org.apache.juneau.svl.*; 017 018/** 019 * Request form data variable resolver. 020 * 021 * <p> 022 * The format for this var is <js>"$RF{key1[,key2...]}"</js>. 023 * 024 * <p> 025 * Used to resolve values returned by {@link RestRequest#getFormData(String)}. 026 * <br>When multiple keys are used, returns the first non-null/empty value. 027 * 028 * <h5 class='section'>Example:</h5> 029 * <p class='bcode w800'> 030 * String foo = restRequest.resolveVars(<js>"$RF{foo}"</js>); 031 * String fooOrBar = restRequest.resolveVars(<js>"$RF{foo,bar}"</js>); 032 * </p> 033 * 034 * <ul class='notes'> 035 * <li> 036 * This variable resolver requires that a {@link RestRequest} object be set as a context object on the resolver 037 * or a session object on the resolver session. 038 * <li> 039 * For security reasons, nested and recursive variables are not resolved. 040 * </ul> 041 * 042 * <ul class='seealso'> 043 * <li class='link'>{@doc juneau-rest-server.SvlVariables} 044 * </ul> 045 */ 046public class RequestFormDataVar extends MultipartResolvingVar { 047 048 private static final String SESSION_req = "req"; 049 050 /** The name of this variable. */ 051 public static final String NAME = "RF"; 052 053 /** 054 * Constructor. 055 */ 056 public RequestFormDataVar() { 057 super(NAME); 058 } 059 060 @Override /* Var */ 061 protected boolean allowNested() { 062 return false; 063 } 064 065 @Override /* Var */ 066 protected boolean allowRecurse() { 067 return false; 068 } 069 070 @Override /* Var */ 071 public String resolve(VarResolverSession session, String key) { 072 RestRequest req = session.getSessionObject(RestRequest.class, SESSION_req, true); 073 return req.getFormData(key); 074 } 075 076 @Override /* Var */ 077 public boolean canResolve(VarResolverSession session) { 078 return session.hasSessionObject(SESSION_req); 079 } 080}