1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #pragma once 17 18 #ifndef PRIVACY_BUFFER_H 19 #define PRIVACY_BUFFER_H 20 21 #include "Privacy.h" 22 23 #include <android/util/EncodedBuffer.h> 24 #include <android/util/ProtoOutputStream.h> 25 #include <stdint.h> 26 #include <utils/Errors.h> 27 28 namespace android { 29 namespace os { 30 namespace incidentd { 31 32 using namespace android::util; 33 34 /** 35 * PrivacyBuffer holds the original protobuf data and strips PII-sensitive fields 36 * based on the request and holds stripped data in its own buffer for output. 37 */ 38 class PrivacyBuffer { 39 public: 40 PrivacyBuffer(const Privacy* policy, EncodedBuffer::iterator data); 41 ~PrivacyBuffer(); 42 43 /** 44 * Strip based on the request and hold data in its own buffer. Return NO_ERROR if strip 45 * succeeds. 46 */ 47 status_t strip(const PrivacySpec& spec); 48 49 /** 50 * Clear encoded buffer so it can be reused by another request. 51 */ 52 void clear(); 53 54 /** 55 * Return the size of the stripped data. 56 */ 57 size_t size() const; 58 59 /** 60 * Flush buffer to the given fd. NO_ERROR is returned if the flush succeeds. 61 */ 62 status_t flush(int fd); 63 64 private: 65 const Privacy* mPolicy; 66 EncodedBuffer::iterator mData; 67 68 ProtoOutputStream mProto; 69 size_t mSize; 70 71 status_t stripField(const Privacy* parentPolicy, const PrivacySpec& spec, int depth); 72 void writeFieldOrSkip(uint32_t fieldTag, bool skip); 73 }; 74 75 } // namespace incidentd 76 } // namespace os 77 } // namespace android 78 79 #endif // PRIVACY_BUFFER_H