1 // Copyright 2021 Code Intelligence GmbH 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package com.example; 16 17 import com.code_intelligence.jazzer.api.FuzzedDataProvider; 18 import com.google.json.JsonSanitizer; 19 20 public class JsonSanitizerIdempotenceFuzzer { fuzzerTestOneInput(FuzzedDataProvider data)21 public static void fuzzerTestOneInput(FuzzedDataProvider data) { 22 String input = data.consumeRemainingAsString(); 23 String validJson; 24 try { 25 validJson = JsonSanitizer.sanitize(input, 10); 26 } catch (Exception e) { 27 return; 28 } 29 30 // Ensure that sanitizing twice does not give different output (idempotence). Since failure to 31 // be idempotent is not a security issue in itself, fail with a regular AssertionError. 32 assert JsonSanitizer.sanitize(validJson).equals(validJson) : "Not idempotent"; 33 } 34 } 35