lib/cpp/test/JSONProtoTest.cpp

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.
 */

#define _USE_MATH_DEFINES
#include <cmath>
#include <iomanip>
#include <sstream>
#include <thrift/protocol/TJSONProtocol.h>
#include <memory>
#include <string>
#include <thrift/TConfiguration.h>
#include <thrift/transport/TBufferTransports.h>
#include <thrift/transport/TTransportException.h>
#include <thrift/transport/TVirtualTransport.h>
#include "gen-cpp/DebugProtoTest_types.h"

#define BOOST_TEST_MODULE JSONProtoTest
#include <boost/test/unit_test.hpp>

using namespace thrift::test::debug;
using namespace apache::thrift;
using apache::thrift::transport::TMemoryBuffer;
using apache::thrift::protocol::TJSONProtocol;

static std::shared_ptr<OneOfEach> ooe;

void testCaseSetup_1() {
  ooe.reset(new OneOfEach);
  ooe->im_true = true;
  ooe->im_false = false;
  ooe->a_bite = 0x7f;
  ooe->integer16 = 27000;
  ooe->integer32 = 1 << 24;
  ooe->integer64 = (uint64_t)6000 * 1000 * 1000;
  ooe->double_precision = M_PI;
  ooe->some_characters = "JSON THIS! \"\1";
  ooe->zomg_unicode = "\xd7\n\a\t";
  ooe->base64 = "\1\2\3\255";
  ooe->rfc4122_uuid = apache::thrift::TUuid{"00000000-0000-0000-0000-000000000000"};
}

BOOST_AUTO_TEST_CASE(test_json_proto_1) {
  testCaseSetup_1();

  const std::string expected_result(
  "{\"1\":{\"tf\":1},\"2\":{\"tf\":0},\"3\":{\"i8\":127},\"4\":{\"i16\":27000},"
  "\"5\":{\"i32\":16777216},\"6\":{\"i64\":6000000000},\"7\":{\"dbl\":3.1415926"
  "535897931},\"8\":{\"str\":\"JSON THIS! \\\"\\u0001\"},\"9\":{\"str\":\"\xd7\\"
  "n\\u0007\\t\"},\"10\":{\"tf\":0},\"11\":{\"str\":\"AQIDrQ\"},\"12\":{\"lst\""
  ":[\"i8\",3,1,2,3]},\"13\":{\"lst\":[\"i16\",3,1,2,3]},\"14\":{\"lst\":[\"i64"
  "\",3,1,2,3]},\"15\":{\"uid\":\"00000000-0000-0000-0000-000000000000\"},\"16\""
  ":{\"lst\":[\"uid\",0]}}");

  const std::string result(apache::thrift::ThriftJSONString(*ooe));

  BOOST_CHECK_MESSAGE(!expected_result.compare(result),
    "Expected:\n" << expected_result << "\nGotten:\n" << result);
}

static std::shared_ptr<Nesting> n;

void testCaseSetup_2() {
  testCaseSetup_1();

  n.reset(new Nesting);
  n->my_ooe = *ooe;
  n->my_ooe.integer16 = 16;
  n->my_ooe.integer32 = 32;
  n->my_ooe.integer64 = 64;
  n->my_ooe.double_precision = (std::sqrt(5.0) + 1) / 2;
  n->my_ooe.some_characters = ":R (me going \"rrrr\")";
  n->my_ooe.zomg_unicode     = "\xd3\x80\xe2\x85\xae\xce\x9d\x20\xd0\x9d\xce"
                               "\xbf\xe2\x85\xbf\xd0\xbe\xc9\xa1\xd0\xb3\xd0"
                               "\xb0\xcf\x81\xe2\x84\x8e\x20\xce\x91\x74\x74"
                               "\xce\xb1\xe2\x85\xbd\xce\xba\xc7\x83\xe2\x80"
                               "\xbc";
  n->my_ooe.rfc4122_uuid = apache::thrift::TUuid{"5e2ab188-1726-4e75-a04f-1ed9a6a89c4c"};
  std::vector<apache::thrift::TUuid> uuiid_list;
  uuiid_list.push_back(apache::thrift::TUuid{"{fa1af5ec-fdc2-4355-844a-9f0dbfd00e50}"});
  uuiid_list.push_back(apache::thrift::TUuid{"{1beece83-34f4-4fa3-b757-1ad1ac157fe3}"});
  n->my_ooe.rfc4122_uuid_list = uuiid_list;
  n->my_bonk.type = 31337;
  n->my_bonk.message = "I am a bonk... xor!";
}

BOOST_AUTO_TEST_CASE(test_json_proto_2) {
  testCaseSetup_2();

  const std::string expected_result(
    "{\"1\":{\"rec\":{\"1\":{\"i32\":31337},\"2\":{\"str\":\"I am a bonk... xor"
    "!\"}}},\"2\":{\"rec\":{\"1\":{\"tf\":1},\"2\":{\"tf\":0},\"3\":{\"i8\":127"
    "},\"4\":{\"i16\":16},\"5\":{\"i32\":32},\"6\":{\"i64\":64},\"7\":{\"dbl\":"
    "1.6180339887498949},\"8\":{\"str\":\":R (me going \\\"rrrr\\\")\"},\"9\":{"
    "\"str\":\"ӀⅮΝ Нοⅿоɡгаρℎ Αttαⅽκǃ‼\"},\"10\":{\"tf\":0},\"11\":{\"str\":\""
    "AQIDrQ\"},\"12\":{\"lst\":[\"i8\",3,1,2,3]},\"13\":{\"lst\":[\"i16\",3,1,2"
    ",3]},\"14\":{\"lst\":[\"i64\",3,1,2,3]},\"15\":{\"uid\":\"5e2ab188-1726-"
    "4e75-a04f-1ed9a6a89c4c\"},\"16\":{\"lst\":[\"uid\",2,\"fa1af5ec-fdc2-4355-"
    "844a-9f0dbfd00e50\",\"1beece83-34f4-4fa3-b757-1ad1ac157fe3\"]}}}}"
  );

  const std::string result(apache::thrift::ThriftJSONString(*n));

  BOOST_CHECK_MESSAGE(!expected_result.compare(result),
    "Expected:\n" << expected_result << "\nGotten:\n" << result);
}

static std::shared_ptr<HolyMoley> hm;

void testCaseSetup_3() {
  testCaseSetup_2();

  hm.reset(new HolyMoley);

  hm->big.push_back(*ooe);
  hm->big.push_back(n->my_ooe);
  hm->big[0].a_bite = 0x22;
  hm->big[1].a_bite = 0x33;

  std::vector<std::string> stage1;
  stage1.push_back("and a one");
  stage1.push_back("and a two");
  hm->contain.insert(stage1);
  stage1.clear();
  stage1.push_back("then a one, two");
  stage1.push_back("three!");
  stage1.push_back("FOUR!!");
  hm->contain.insert(stage1);
  stage1.clear();
  hm->contain.insert(stage1);

  std::vector<Bonk> stage2;
  hm->bonks["nothing"] = stage2;
  stage2.resize(stage2.size() + 1);
  stage2.back().type = 1;
  stage2.back().message = "Wait.";
  stage2.resize(stage2.size() + 1);
  stage2.back().type = 2;
  stage2.back().message = "What?";
  hm->bonks["something"] = stage2;
  stage2.clear();
  stage2.resize(stage2.size() + 1);
  stage2.back().type = 3;
  stage2.back().message = "quoth";
  stage2.resize(stage2.size() + 1);
  stage2.back().type = 4;
  stage2.back().message = "the raven";
  stage2.resize(stage2.size() + 1);
  stage2.back().type = 5;
  stage2.back().message = "nevermore";
  hm->bonks["poe"] = stage2;
}

BOOST_AUTO_TEST_CASE(test_json_proto_3) {
  testCaseSetup_3();

  const std::string expected_result(
  "{\"1\":{\"lst\":[\"rec\",2,{\"1\":{\"tf\":1},\"2\":{\"tf\":0},\"3\":{\"i8\":"
  "34},\"4\":{\"i16\":27000},\"5\":{\"i32\":16777216},\"6\":{\"i64\":6000000000"
  "},\"7\":{\"dbl\":3.1415926535897931},\"8\":{\"str\":\"JSON THIS! \\\"\\u0001"
  "\"},\"9\":{\"str\":\"\xd7\\n\\u0007\\t\"},\"10\":{\"tf\":0},\"11\":{\"str\":"
  "\"AQIDrQ\"},\"12\":{\"lst\":[\"i8\",3,1,2,3]},\"13\":{\"lst\":[\"i16\",3,1,2"
  ",3]},\"14\":{\"lst\":[\"i64\",3,1,2,3]},\"15\":{\"uid\":\"00000000-0000-0000"
  "-0000-000000000000\"},\"16\":{\"lst\":[\"uid\",0]}},{\"1\":{\"tf\":1},\"2\":{\"tf\":0},"
  "\"3\":{\"i8\":51},\"4\":{\"i16\":16},\"5\":{\"i32\":32},\"6\":{\"i64\":64},"
  "\"7\":{\"dbl\":1.6180339887498949},\"8\":{\"str\":\":R (me going \\\"rrrr\\\""
  ")\"},\"9\":{\"str\":\"ӀⅮΝ Нοⅿоɡгаρℎ Αttαⅽκǃ‼\"},\"10\":{\"tf\":0},\"11\":{"
  "\"str\":\"AQIDrQ\"},\"12\":{\"lst\":[\"i8\",3,1,2,3]},\"13\":{\"lst\":[\"i16"
  "\",3,1,2,3]},\"14\":{\"lst\":[\"i64\",3,1,2,3]},\"15\":{\"uid\":\"5e2ab188-"
  "1726-4e75-a04f-1ed9a6a89c4c\"},\"16\":{\"lst\":[\"uid\",2,\"fa1af5ec-fdc2-4355-"
  "844a-9f0dbfd00e50\",\"1beece83-34f4-4fa3-b757-1ad1ac157fe3\"]}}]},\"2\":{\"set\":[\"lst\",3"
  ",[\"str\",0],[\"str\",2,\"and a one\",\"and a two\"],[\"str\",3,\"then a one"
  ", two\",\"three!\",\"FOUR!!\"]]},\"3\":{\"map\":[\"str\",\"lst\",3,{\"nothin"
  "g\":[\"rec\",0],\"poe\":[\"rec\",3,{\"1\":{\"i32\":3},\"2\":{\"str\":\"quoth"
  "\"}},{\"1\":{\"i32\":4},\"2\":{\"str\":\"the raven\"}},{\"1\":{\"i32\":5},\""
  "2\":{\"str\":\"nevermore\"}}],\"something\":[\"rec\",2,{\"1\":{\"i32\":1},\""
  "2\":{\"str\":\"Wait.\"}},{\"1\":{\"i32\":2},\"2\":{\"str\":\"What?\"}}]}]}}"
  );

  const std::string result(apache::thrift::ThriftJSONString(*hm));

  BOOST_CHECK_MESSAGE(!expected_result.compare(result),
    "Expected:\n" << expected_result << "\nGotten:\n" << result);
}

BOOST_AUTO_TEST_CASE(test_json_proto_4) {
  testCaseSetup_1();

  std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer());
  std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));

  ooe->write(proto.get());
  OneOfEach ooe2;
  ooe2.read(proto.get());

  BOOST_TEST_INFO("written: " << *ooe);
  BOOST_TEST_INFO("read   : " << ooe2);
  BOOST_CHECK(*ooe == ooe2);
}

BOOST_AUTO_TEST_CASE(test_json_proto_5) {
  testCaseSetup_3();

  std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer());
  std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));

  hm->write(proto.get());
  HolyMoley hm2;
  hm2.read(proto.get());

  BOOST_TEST_INFO("written: " << *hm);
  BOOST_TEST_INFO("read   : " << hm2);
  BOOST_CHECK(*hm == hm2);

  hm2.big[0].a_bite = 0x00;

  BOOST_CHECK(*hm != hm2);
}

BOOST_AUTO_TEST_CASE(test_json_proto_6) {
  Doubles dub;
  dub.nan = HUGE_VAL / HUGE_VAL;
  dub.inf = HUGE_VAL;
  dub.neginf = -HUGE_VAL;
  dub.repeating = 10.0 / 3.0;
  dub.big = 1E+305;
  dub.tiny = 1E-305;
  dub.zero = 0.0;
  dub.negzero = -0.0;

  const std::string expected_result(
  "{\"1\":{\"dbl\":\"NaN\"},\"2\":{\"dbl\":\"Infinity\"},\"3\":{\"dbl\":\"-Infi"
  "nity\"},\"4\":{\"dbl\":3.3333333333333335},\"5\":{\"dbl\":9.9999999999999994e+"
  "304},\"6\":{\"dbl\":1e-305},\"7\":{\"dbl\":0},\"8\":{\"dbl\":-0}}"
  );

  std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer());
  std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));
  dub.write(proto.get());
  Doubles dub_1;
  dub_1.read(proto.get());

  const std::string result(apache::thrift::ThriftJSONString(dub));
  const std::string result_1(apache::thrift::ThriftJSONString(dub_1));

  BOOST_CHECK_MESSAGE(!expected_result.compare(result),
    "Expected:\n" << expected_result << "\nGotten:\n" << result);
  BOOST_CHECK_MESSAGE(!expected_result.compare(result_1),
    "Expected:\n" << expected_result << "\nGotten:\n" << result_1);
}

BOOST_AUTO_TEST_CASE(test_json_proto_7) {
  std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer());
  std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));

  Base64 base;
  base.a = 123;
  base.b1 = "1";
  base.b2 = "12";
  base.b3 = "123";
  base.b4 = "1234";
  base.b5 = "12345";
  base.b6 = "123456";

  base.write(proto.get());
  Base64 base2;
  base2.read(proto.get());

  BOOST_CHECK(base == base2);
}

BOOST_AUTO_TEST_CASE(test_json_proto_8) {
  const char* json_string =
  "{\"1\":{\"tf\":1},\"2\":{\"tf\":0},\"3\":{\"i8\":127},\"4\":{\"i16\":27000},"
  "\"5\":{\"i32\":16.77216},\"6\":{\"i64\":6000000000},\"7\":{\"dbl\":3.1415926"
  "535897931},\"8\":{\"str\":\"JSON THIS! \\\"\\u0001\"},\"9\":{\"str\":\"\xd7\\"
  "n\\u0007\\t\"},\"10\":{\"tf\":0},\"11\":{\"str\":\"AQIDrQ\"},\"12\":{\"lst\""
  ":[\"i8\",3,1,2,3]},\"13\":{\"lst\":[\"i16\",3,1,2,3]},\"14\":{\"lst\":[\"i64"
  "\",3,1,2,3]}}";

  const std::size_t bufSiz = strlen(json_string) * sizeof(char);
  std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer(
    (uint8_t*)(json_string), static_cast<uint32_t>(bufSiz)));
  std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));

  OneOfEach ooe2;

  BOOST_CHECK_THROW(ooe2.read(proto.get()),
    apache::thrift::protocol::TProtocolException);
}

static std::string toHexSequence(const std::string& str) {
  std::stringstream ss;
  ss << std::hex << std::setfill('0');
  for (std::size_t i = 0; i < str.size(); i++) {
    ss << "\\x" << int(uint8_t(str[i]));
  }
  return ss.str();
}

BOOST_AUTO_TEST_CASE(test_json_unicode_escaped) {
  const char json_string[] =
  "{\"1\":{\"tf\":1},\"2\":{\"tf\":0},\"3\":{\"i8\":127},\"4\":{\"i16\":27000},"
  "\"5\":{\"i32\":16},\"6\":{\"i64\":6000000000},\"7\":{\"dbl\":3.1415926"
  "535897931},\"8\":{\"str\":\"JSON THIS!\"},\"9\":{\"str\":\"\\u0e01 \\ud835\\udd3e\"},"
  "\"10\":{\"tf\":0},\"11\":{\"str\":\"000000\"},\"12\":{\"lst\""
  ":[\"i8\",3,1,2,3]},\"13\":{\"lst\":[\"i16\",3,1,2,3]},\"14\":{\"lst\":[\"i64"
  "\",3,1,2,3]}}";
  const char* expected_zomg_unicode = "\xe0\xb8\x81 \xf0\x9d\x94\xbe";

  std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer(
    (uint8_t*)(json_string), sizeof(json_string)));
  std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));

  OneOfEach ooe2;
  ooe2.read(proto.get());
  BOOST_CHECK_MESSAGE(!ooe2.zomg_unicode.compare(expected_zomg_unicode),
    "Expected:\n" << toHexSequence(expected_zomg_unicode) << "\nGotten:\n"
                  << toHexSequence(ooe2.zomg_unicode));

}

BOOST_AUTO_TEST_CASE(test_json_unicode_escaped_missing_low_surrogate) {
  const char json_string[] =
  "{\"1\":{\"tf\":1},\"2\":{\"tf\":0},\"3\":{\"i8\":127},\"4\":{\"i16\":27000},"
  "\"5\":{\"i32\":16},\"6\":{\"i64\":6000000000},\"7\":{\"dbl\":3.1415926"
  "535897931},\"8\":{\"str\":\"JSON THIS!\"},\"9\":{\"str\":\"\\ud835\"},"
  "\"10\":{\"tf\":0},\"11\":{\"str\":\"000000\"},\"12\":{\"lst\""
  ":[\"i8\",3,1,2,3]},\"13\":{\"lst\":[\"i16\",3,1,2,3]},\"14\":{\"lst\":[\"i64"
  "\",3,1,2,3]}}";

  std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer(
    (uint8_t*)(json_string), sizeof(json_string)));
  std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));

  OneOfEach ooe2;
  BOOST_CHECK_THROW(ooe2.read(proto.get()),
    apache::thrift::protocol::TProtocolException);
}

BOOST_AUTO_TEST_CASE(test_json_unicode_escaped_missing_hi_surrogate) {
  const char json_string[] =
  "{\"1\":{\"tf\":1},\"2\":{\"tf\":0},\"3\":{\"i8\":127},\"4\":{\"i16\":27000},"
  "\"5\":{\"i32\":16},\"6\":{\"i64\":6000000000},\"7\":{\"dbl\":3.1415926"
  "535897931},\"8\":{\"str\":\"JSON THIS!\"},\"9\":{\"str\":\"\\udd3e\"},"
  "\"10\":{\"tf\":0},\"11\":{\"str\":\"000000\"},\"12\":{\"lst\""
  ":[\"i8\",3,1,2,3]},\"13\":{\"lst\":[\"i16\",3,1,2,3]},\"14\":{\"lst\":[\"i64"
  "\",3,1,2,3]}}";

  std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer(
    (uint8_t*)(json_string), sizeof(json_string)));
  std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));

  OneOfEach ooe2;
  BOOST_CHECK_THROW(ooe2.read(proto.get()),
    apache::thrift::protocol::TProtocolException);
}

BOOST_AUTO_TEST_CASE(test_json_invalid_byte_range) {
  // Test case for byte values outside valid range
  const char json_string[] = "\"3\":{\"i8\":849}";

  std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer(
    (uint8_t*)(json_string), sizeof(json_string)));
  std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));

  OneOfEach ooe2;
  BOOST_CHECK_THROW(ooe2.read(proto.get()),
    apache::thrift::protocol::TProtocolException);
}

BOOST_AUTO_TEST_CASE(test_json_base64_padding_validation) {
  auto test_base64_padding = [](const std::string& base64_value) {
    std::string json_string = "{\"11\":{\"str\":\"" + base64_value + "\"}}";
    std::shared_ptr<TMemoryBuffer> buffer(new TMemoryBuffer(
      (uint8_t*)(json_string.c_str()), static_cast<uint32_t>(json_string.size())));
    std::shared_ptr<TJSONProtocol> proto(new TJSONProtocol(buffer));

    OneOfEach ooe;
    BOOST_CHECK_NO_THROW(ooe.read(proto.get()));
  };

  // Valid base64 with 1 padding character
  test_base64_padding("QWE=");
  // Valid base64 with 2 padding characters
  test_base64_padding("QQ==");
  // Just padding
  test_base64_padding("=");
  test_base64_padding("==");
  // Malformed base64 with excessive padding (processed conservatively)
  test_base64_padding("===");
  test_base64_padding("====");
}

// A single JSON string is quote-delimited, so unlike a length-prefixed binary
// string there is no declared size to reject up front. readJSONString() must
// therefore bound the string it decodes against the configured MaxMessageSize:
// a string within the limit is still read, but one larger than the limit is
// rejected rather than grown without bound.
BOOST_AUTO_TEST_CASE(test_json_string_respects_max_message_size) {
  const int kMaxMessageSize = 1024;

  // A string comfortably under the limit is accepted unchanged.
  {
    auto config = std::make_shared<TConfiguration>(kMaxMessageSize);
    std::string json = "\"" + std::string(kMaxMessageSize / 2, 'A') + "\"";
    auto buffer = std::make_shared<TMemoryBuffer>(reinterpret_cast<uint8_t*>(&json[0]),
                                                  static_cast<uint32_t>(json.size()),
                                                  TMemoryBuffer::COPY,
                                                  config);
    auto proto = std::make_shared<TJSONProtocol>(buffer);
    std::string out;
    BOOST_CHECK_NO_THROW(proto->readString(out));
    BOOST_CHECK_EQUAL(out.size(), static_cast<size_t>(kMaxMessageSize / 2));
  }

  // A single string larger than the configured limit is rejected.
  {
    auto config = std::make_shared<TConfiguration>(kMaxMessageSize);
    std::string json = "\"" + std::string(kMaxMessageSize * 2, 'A') + "\"";
    auto buffer = std::make_shared<TMemoryBuffer>(reinterpret_cast<uint8_t*>(&json[0]),
                                                  static_cast<uint32_t>(json.size()),
                                                  TMemoryBuffer::COPY,
                                                  config);
    auto proto = std::make_shared<TJSONProtocol>(buffer);
    std::string out;
    BOOST_CHECK_THROW(proto->readString(out),
                      apache::thrift::transport::TTransportException);
  }
}

// The same char-by-char, no-declared-length reasoning applies to numeric
// literals via readJSONNumericChars(): an over-long numeric run must also be
// bounded by the configured MaxMessageSize.
BOOST_AUTO_TEST_CASE(test_json_number_respects_max_message_size) {
  const int kMaxMessageSize = 1024;
  auto config = std::make_shared<TConfiguration>(kMaxMessageSize);
  // Terminate the numeric run with a non-numeric byte so that, without the
  // size bound, readJSONNumericChars() stops cleanly (rather than throwing on
  // buffer exhaustion) and the test isolates the MaxMessageSize check itself.
  std::string json = std::string(kMaxMessageSize * 2, '1') + " ";
  auto buffer = std::make_shared<TMemoryBuffer>(reinterpret_cast<uint8_t*>(&json[0]),
                                                static_cast<uint32_t>(json.size()),
                                                TMemoryBuffer::COPY,
                                                config);
  auto proto = std::make_shared<TJSONProtocol>(buffer);
  int64_t out = 0;
  BOOST_CHECK_THROW(proto->readI64(out), apache::thrift::transport::TTransportException);
}

// TMemoryBuffer checks the message size budget but never draws it down, so the
// tests above cannot tell a bound against the configured maximum apart from one
// against the size still remaining -- on such a transport the two are the same
// thing. TZlibTransport::read() does draw the budget down as bytes are consumed;
// this stand-in reproduces that accounting without adding a zlib dependency to
// this test.
class TCountingTransport
    : public apache::thrift::transport::TVirtualTransport<TCountingTransport> {
public:
  TCountingTransport(std::shared_ptr<apache::thrift::transport::TTransport> inner,
                     std::shared_ptr<TConfiguration> config)
    : TVirtualTransport(config), inner_(inner) {}

  uint32_t read(uint8_t* buf, uint32_t len) {
    checkReadBytesAvailable(len);
    uint32_t got = inner_->read(buf, len);
    countConsumedMessageBytes(got);
    return got;
  }

  void write(const uint8_t* buf, uint32_t len) { inner_->write(buf, len); }
  bool isOpen() const override { return inner_->isOpen(); }
  void open() override { inner_->open(); }
  void close() override { inner_->close(); }

private:
  std::shared_ptr<apache::thrift::transport::TTransport> inner_;
};

static std::shared_ptr<TJSONProtocol> countingProtoReading(const std::string& json,
                                                           std::shared_ptr<TConfiguration> config) {
  auto buffer = std::make_shared<TMemoryBuffer>(
      reinterpret_cast<uint8_t*>(const_cast<char*>(json.data())),
      static_cast<uint32_t>(json.size()), TMemoryBuffer::COPY, config);
  auto transport = std::make_shared<TCountingTransport>(buffer, config);
  return std::make_shared<TJSONProtocol>(transport);
}

// The size of a field must be measured against the configured maximum, not
// against whatever is left of the message budget: a transport that draws the
// budget down as it reads has already accounted for those same bytes, and
// counting them a second time rejects strings well inside the limit.
BOOST_AUTO_TEST_CASE(test_json_string_size_measured_against_configured_maximum) {
  const int kMaxMessageSize = 1024;
  const size_t kStringSize = kMaxMessageSize * 3 / 4; // inside the limit, past half of it

  // Within the limit: must be read, even though the transport has drawn the
  // remaining budget down by the same bytes as they arrived.
  {
    auto config = std::make_shared<TConfiguration>(kMaxMessageSize);
    auto proto = countingProtoReading("\"" + std::string(kStringSize, 'A') + "\"", config);
    std::string out;
    BOOST_CHECK_NO_THROW(proto->readString(out));
    BOOST_CHECK_EQUAL(out.size(), kStringSize);
  }

  // Past the limit: still rejected on that same transport.
  {
    auto config = std::make_shared<TConfiguration>(kMaxMessageSize);
    auto proto
        = countingProtoReading("\"" + std::string(kMaxMessageSize * 2, 'A') + "\"", config);
    std::string out;
    BOOST_CHECK_THROW(proto->readString(out), apache::thrift::transport::TTransportException);
  }
}

// readJSONNumericChars() counts the same way and needs the same treatment.
BOOST_AUTO_TEST_CASE(test_json_number_size_measured_against_configured_maximum) {
  const int kMaxMessageSize = 40;
  const size_t kDigits = 24; // inside the limit, past half of it

  auto config = std::make_shared<TConfiguration>(kMaxMessageSize);
  // Terminated by a non-numeric byte so the numeric run ends on the terminator
  // rather than on buffer exhaustion, isolating the size check itself.
  auto proto = countingProtoReading(std::string(kDigits, '1') + " ", config);
  double out = 0;
  BOOST_CHECK_NO_THROW(proto->readDouble(out));
}