| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.web.bindery.requestfactory.vm.impl; |
| |
| import com.google.gwt.dev.asm.Type; |
| import com.google.gwt.dev.asm.commons.Method; |
| import com.google.gwt.dev.util.StringKey; |
| import com.google.gwt.user.server.Base64Utils; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| |
| /** |
| * Utility class for encoding RequestFactory operation ids. |
| */ |
| public class OperationKey extends StringKey { |
| /** |
| * The expected length of values returned from {@link #hash(String)}. |
| */ |
| public static final int HASH_LENGTH = 28; |
| |
| static { |
| assert HASH_LENGTH == hash("").length(); |
| } |
| |
| /** |
| * Compute a base64-encoded SHA1 hash of the input string's UTF8 |
| * representation. The result is a {@value #HASH_LENGTH}-character sequence. |
| */ |
| public static String hash(String raw) { |
| try { |
| MessageDigest md = MessageDigest.getInstance("SHA1"); |
| byte[] data = md.digest(raw.getBytes("UTF-8")); |
| return Base64Utils.toBase64(data); |
| } catch (NoSuchAlgorithmException e) { |
| throw new RuntimeException("No MD5 algorithm", e); |
| } catch (UnsupportedEncodingException e) { |
| throw new RuntimeException("No UTF-8", e); |
| } |
| } |
| |
| private static String key(String requestContextBinaryName, String methodName, String descriptor) { |
| Method m = new Method(methodName, Type.VOID_TYPE, Type.getArgumentTypes(descriptor)); |
| String raw = requestContextBinaryName + "::" + methodName + m.getDescriptor(); |
| return raw.length() >= HASH_LENGTH ? hash(raw) : raw; |
| } |
| |
| public OperationKey(String encoded) { |
| super(encoded); |
| assert encoded.length() == HASH_LENGTH : "Expecting only " + HASH_LENGTH |
| + " characters, received " + encoded.length(); |
| } |
| |
| public OperationKey(String requestContextBinaryName, String methodName, String descriptor) { |
| super(key(requestContextBinaryName, methodName, descriptor)); |
| } |
| } |