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json_internal.cc
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#include "source/common/json/json_internal.h"
#include <cstdint>
#include <fstream>
#include <limits>
#include <map>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include "source/common/common/assert.h"
#include "source/common/common/fmt.h"
#include "source/common/common/hash.h"
#include "source/common/common/utility.h"
#include "source/common/protobuf/utility.h"
// Do not let nlohmann/json leak outside of this file.
#include "include/nlohmann/json.hpp"
#include "absl/strings/match.h"
namespace Envoy {
namespace Json {
namespace Nlohmann {
namespace {
/**
* Internal representation of Object.
*/
class Field;
using FieldSharedPtr = std::shared_ptr<Field>;
class Field : public Object {
public:
void setLineNumberStart(uint64_t line_number) { line_number_start_ = line_number; }
void setLineNumberEnd(uint64_t line_number) { line_number_end_ = line_number; }
// Container factories for handler.
static FieldSharedPtr createObject() { return FieldSharedPtr{new Field(Type::Object)}; }
static FieldSharedPtr createArray() { return FieldSharedPtr{new Field(Type::Array)}; }
static FieldSharedPtr createNull() { return FieldSharedPtr{new Field(Type::Null)}; }
bool isArray() const override { return type_ == Type::Array; }
bool isObject() const override { return type_ == Type::Object; }
// Value factory.
template <typename T> static FieldSharedPtr createValue(T value) {
return FieldSharedPtr{new Field(value)}; // NOLINT(modernize-make-shared)
}
void append(FieldSharedPtr field_ptr) {
checkType(Type::Array);
value_.array_value_.push_back(field_ptr);
}
void insert(const std::string& key, FieldSharedPtr field_ptr) {
checkType(Type::Object);
value_.object_value_[key] = field_ptr;
}
uint64_t hash() const override;
absl::StatusOr<ValueType> getValue(const std::string& name) const override;
bool getBoolean(const std::string& name) const override;
bool getBoolean(const std::string& name, bool default_value) const override;
double getDouble(const std::string& name) const override;
double getDouble(const std::string& name, double default_value) const override;
int64_t getInteger(const std::string& name) const override;
int64_t getInteger(const std::string& name, int64_t default_value) const override;
ObjectSharedPtr getObject(const std::string& name, bool allow_empty) const override;
absl::StatusOr<ObjectSharedPtr> getObjectNoThrow(const std::string& name,
bool allow_empty) const override;
std::vector<ObjectSharedPtr> getObjectArray(const std::string& name,
bool allow_empty) const override;
std::string getString(const std::string& name) const override;
std::string getString(const std::string& name, const std::string& default_value) const override;
std::vector<std::string> getStringArray(const std::string& name, bool allow_empty) const override;
std::vector<ObjectSharedPtr> asObjectArray() const override;
std::string asString() const override { return stringValue(); }
std::string asJsonString() const override;
bool empty() const override;
bool hasObject(const std::string& name) const override;
void iterate(const ObjectCallback& callback) const override;
void validateSchema(const std::string&) const override;
private:
enum class Type {
Array,
Boolean,
Double,
Integer,
Null,
Object,
String,
};
static const char* typeAsString(Type t) {
switch (t) {
case Type::Array:
return "Array";
case Type::Boolean:
return "Boolean";
case Type::Double:
return "Double";
case Type::Integer:
return "Integer";
case Type::Null:
return "Null";
case Type::Object:
return "Object";
case Type::String:
return "String";
}
return "";
}
struct Value {
std::vector<FieldSharedPtr> array_value_;
bool boolean_value_;
double double_value_;
int64_t integer_value_;
std::map<std::string, FieldSharedPtr> object_value_;
std::string string_value_;
};
explicit Field(Type type) : type_(type) {}
explicit Field(const std::string& value) : type_(Type::String) { value_.string_value_ = value; }
explicit Field(int64_t value) : type_(Type::Integer) { value_.integer_value_ = value; }
explicit Field(double value) : type_(Type::Double) { value_.double_value_ = value; }
explicit Field(bool value) : type_(Type::Boolean) { value_.boolean_value_ = value; }
bool isType(Type type) const { return type == type_; }
void checkType(Type type) const {
if (!isType(type)) {
throwExceptionOrPanic(
Exception,
fmt::format(
"JSON field from line {} accessed with type '{}' does not match actual type '{}'.",
line_number_start_, typeAsString(type), typeAsString(type_)));
}
}
// Value return type functions.
std::string stringValue() const {
checkType(Type::String);
return value_.string_value_;
}
std::vector<FieldSharedPtr> arrayValue() const {
checkType(Type::Array);
return value_.array_value_;
}
bool booleanValue() const {
checkType(Type::Boolean);
return value_.boolean_value_;
}
double doubleValue() const {
checkType(Type::Double);
return value_.double_value_;
}
int64_t integerValue() const {
checkType(Type::Integer);
return value_.integer_value_;
}
nlohmann::json asJsonDocument() const;
static void buildJsonDocument(const Field& field, nlohmann::json& value);
uint64_t line_number_start_ = 0;
uint64_t line_number_end_ = 0;
const Type type_;
Value value_;
};
/**
* Consume events from SAX callbacks to build JSON Field.
*/
class ObjectHandler : public nlohmann::json_sax<nlohmann::json> {
public:
ObjectHandler() = default;
bool start_object(std::size_t) override;
bool end_object() override;
bool key(std::string& val) override;
bool start_array(std::size_t) override;
bool end_array() override;
bool boolean(bool value) override { return handleValueEvent(Field::createValue(value)); }
bool number_integer(int64_t value) override {
return handleValueEvent(Field::createValue(static_cast<int64_t>(value)));
}
bool number_unsigned(uint64_t value) override {
if (value > static_cast<uint64_t>(std::numeric_limits<int64_t>::max())) {
throwExceptionOrPanic(
Exception, fmt::format("JSON value from line {} is larger than int64_t (not supported)",
line_number_));
}
return handleValueEvent(Field::createValue(static_cast<int64_t>(value)));
}
bool number_float(double value, const std::string&) override {
return handleValueEvent(Field::createValue(value));
}
bool null() override { return handleValueEvent(Field::createNull()); }
bool string(std::string& value) override { return handleValueEvent(Field::createValue(value)); }
bool binary(binary_t&) override { return false; }
bool parse_error(std::size_t at, const std::string& token,
const nlohmann::detail::exception& ex) override {
// Parse errors are formatted like "[json.exception.parse_error.101] parse error: explanatory
// string." or "[json.exception.parse_error.101] parser error at (position): explanatory
// string.". All errors start with "[json.exception.<error_type>.<error_num]" see:
// https://json.nlohmann.me/home/exceptions/#parse-errors
// The `parse_error` method will be called also for non-parse errors.
absl::string_view error = ex.what();
// Colon will always exist in the parse error. For non-parse error use the
// ending ']' as a separator.
auto end = error.find(": ");
auto prefix_end = error.find(']');
if (end != std::string::npos) {
// Extract portion after ": " to get error string.
error_ = std::string(error.substr(end + 2));
// Extract position information if present.
auto start = error.find("at ");
if (start != std::string::npos && (start + 3) < end) {
start += 3;
error_position_ = absl::StrCat(error.substr(start, end - start), ", token ", token);
}
} else if ((prefix_end != std::string::npos) && (absl::StartsWith(error, ErrorPrefix))) {
// Non-parse error, fetching position from the arguments as it is not
// present in the error string.
error_position_ = absl::StrCat("position: ", at);
error_ = std::string(error.substr(prefix_end + 1));
} else {
IS_ENVOY_BUG("Error string not present. Check nlohmann/json "
"documentation in case error string changed.");
}
return false;
}
bool hasParseError() { return !error_.empty(); }
std::string getParseError() { return error_; }
std::string getErrorPosition() { return error_position_; }
ObjectSharedPtr getRoot() { return root_; }
int line_number_{1};
private:
bool handleValueEvent(FieldSharedPtr ptr);
enum class State {
ExpectRoot,
ExpectKeyOrEndObject,
ExpectValueOrStartObjectArray,
ExpectArrayValueOrEndArray,
ExpectFinished,
};
State state_{State::ExpectRoot};
std::stack<FieldSharedPtr> stack_;
std::string key_;
FieldSharedPtr root_;
std::string error_;
std::string error_position_;
static constexpr absl::string_view ErrorPrefix = "[json.exception.";
};
struct JsonContainer {
JsonContainer(const char* ch, ObjectHandler* handler) : data(ch), handler_(handler) {}
const char* data;
ObjectHandler* handler_;
};
struct JsonIterator {
using difference_type = std::ptrdiff_t; // NOLINT(readability-identifier-naming)
using value_type = char; // NOLINT(readability-identifier-naming)
using pointer = const char*; // NOLINT(readability-identifier-naming)
using reference = const char&; // NOLINT(readability-identifier-naming)
using iterator_category = std::input_iterator_tag; // NOLINT(readability-identifier-naming)
JsonIterator& operator++() {
++ptr.data;
return *this;
}
bool operator!=(const JsonIterator& rhs) const { return rhs.ptr.data != ptr.data; }
reference operator*() {
const char& ch = *(ptr.data);
if (ch == '\n') {
ptr.handler_->line_number_++;
}
return ch;
}
JsonContainer ptr;
};
JsonIterator begin(const JsonContainer& c) {
return JsonIterator{JsonContainer(c.data, c.handler_)};
}
JsonIterator end(const JsonContainer& c) {
return JsonIterator{JsonContainer(c.data + strlen(c.data), c.handler_)};
}
void Field::buildJsonDocument(const Field& field, nlohmann::json& value) {
switch (field.type_) {
case Type::Array: {
for (const auto& element : field.value_.array_value_) {
switch (element->type_) {
case Type::Array:
case Type::Object: {
nlohmann::json nested_value;
buildJsonDocument(*element, nested_value);
value.push_back(nested_value);
break;
}
case Type::Boolean:
value.push_back(element->value_.boolean_value_);
break;
case Type::Double:
value.push_back(element->value_.double_value_);
break;
case Type::Integer:
value.push_back(element->value_.integer_value_);
break;
case Type::Null:
value.push_back(nlohmann::json::value_t::null);
break;
case Type::String:
value.push_back(element->value_.string_value_);
}
}
break;
}
case Type::Object: {
for (const auto& item : field.value_.object_value_) {
auto name = std::string(item.first);
switch (item.second->type_) {
case Type::Array:
case Type::Object: {
nlohmann::json nested_value;
buildJsonDocument(*item.second, nested_value);
value.emplace(name, nested_value);
break;
}
case Type::Boolean:
value.emplace(name, item.second->value_.boolean_value_);
break;
case Type::Double:
value.emplace(name, item.second->value_.double_value_);
break;
case Type::Integer:
value.emplace(name, item.second->value_.integer_value_);
break;
case Type::Null:
value.emplace(name, nlohmann::json::value_t::null);
break;
case Type::String:
value.emplace(name, item.second->value_.string_value_);
break;
}
}
break;
}
case Type::Null: {
break;
}
case Type::Boolean:
FALLTHRU;
case Type::Double:
FALLTHRU;
case Type::Integer:
FALLTHRU;
case Type::String:
PANIC("not implemented");
}
}
nlohmann::json Field::asJsonDocument() const {
nlohmann::json j;
buildJsonDocument(*this, j);
return j;
}
uint64_t Field::hash() const { return HashUtil::xxHash64(asJsonString()); }
absl::StatusOr<ValueType> Field::getValue(const std::string& name) const {
auto value_itr = value_.object_value_.find(name);
if (value_itr == value_.object_value_.end()) {
return absl::NotFoundError(fmt::format("key '{}' missing from lines {}-{}", name,
line_number_start_, line_number_end_));
}
switch (value_itr->second->type_) {
case Type::Boolean:
return value_itr->second->booleanValue();
case Type::Double:
return value_itr->second->doubleValue();
case Type::Integer:
return value_itr->second->integerValue();
case Type::String:
return value_itr->second->stringValue();
default:
return absl::InternalError(fmt::format("key '{}' not a value type from lines {}-{}", name,
line_number_start_, line_number_end_));
}
}
bool Field::getBoolean(const std::string& name) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr == value_.object_value_.end() || !value_itr->second->isType(Type::Boolean)) {
throwExceptionOrPanic(Exception,
fmt::format("key '{}' missing or not a boolean from lines {}-{}", name,
line_number_start_, line_number_end_));
}
return value_itr->second->booleanValue();
}
bool Field::getBoolean(const std::string& name, bool default_value) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr != value_.object_value_.end()) {
return getBoolean(name);
}
return default_value;
}
double Field::getDouble(const std::string& name) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr == value_.object_value_.end() || !value_itr->second->isType(Type::Double)) {
throwExceptionOrPanic(Exception,
fmt::format("key '{}' missing or not a double from lines {}-{}", name,
line_number_start_, line_number_end_));
}
return value_itr->second->doubleValue();
}
double Field::getDouble(const std::string& name, double default_value) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr != value_.object_value_.end()) {
return getDouble(name);
}
return default_value;
}
int64_t Field::getInteger(const std::string& name) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr == value_.object_value_.end() || !value_itr->second->isType(Type::Integer)) {
throwExceptionOrPanic(Exception,
fmt::format("key '{}' missing or not an integer from lines {}-{}", name,
line_number_start_, line_number_end_));
}
return value_itr->second->integerValue();
}
int64_t Field::getInteger(const std::string& name, int64_t default_value) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr != value_.object_value_.end()) {
return getInteger(name);
}
return default_value;
}
ObjectSharedPtr Field::getObject(const std::string& name, bool allow_empty) const {
auto result = getObjectNoThrow(name, allow_empty);
if (!result.ok()) {
throwExceptionOrPanic(Exception, std::string(result.status().message()));
}
return result.value();
}
absl::StatusOr<ObjectSharedPtr> Field::getObjectNoThrow(const std::string& name,
bool allow_empty) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr == value_.object_value_.end()) {
if (allow_empty) {
return createObject();
} else {
return absl::NotFoundError(fmt::format("key '{}' missing from lines {}-{}", name,
line_number_start_, line_number_end_));
}
} else if (!value_itr->second->isType(Type::Object)) {
return absl::InternalError(fmt::format("key '{}' not an object from line {}", name,
value_itr->second->line_number_start_));
}
return value_itr->second;
}
std::vector<ObjectSharedPtr> Field::getObjectArray(const std::string& name,
bool allow_empty) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr == value_.object_value_.end() || !value_itr->second->isType(Type::Array)) {
if (allow_empty && value_itr == value_.object_value_.end()) {
return {};
}
throwExceptionOrPanic(Exception,
fmt::format("key '{}' missing or not an array from lines {}-{}", name,
line_number_start_, line_number_end_));
}
std::vector<FieldSharedPtr> array_value = value_itr->second->arrayValue();
return {array_value.begin(), array_value.end()};
}
std::string Field::getString(const std::string& name) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr == value_.object_value_.end() || !value_itr->second->isType(Type::String)) {
throwExceptionOrPanic(Exception,
fmt::format("key '{}' missing or not a string from lines {}-{}", name,
line_number_start_, line_number_end_));
}
return value_itr->second->stringValue();
}
std::string Field::getString(const std::string& name, const std::string& default_value) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
if (value_itr != value_.object_value_.end()) {
return getString(name);
}
return default_value;
}
std::vector<std::string> Field::getStringArray(const std::string& name, bool allow_empty) const {
checkType(Type::Object);
std::vector<std::string> string_array;
auto value_itr = value_.object_value_.find(name);
if (value_itr == value_.object_value_.end() || !value_itr->second->isType(Type::Array)) {
if (allow_empty && value_itr == value_.object_value_.end()) {
return string_array;
}
throwExceptionOrPanic(Exception,
fmt::format("key '{}' missing or not an array from lines {}-{}", name,
line_number_start_, line_number_end_));
}
std::vector<FieldSharedPtr> array = value_itr->second->arrayValue();
string_array.reserve(array.size());
for (const auto& element : array) {
if (!element->isType(Type::String)) {
throwExceptionOrPanic(Exception,
fmt::format("JSON array '{}' from line {} does not contain all strings",
name, line_number_start_));
}
string_array.push_back(element->stringValue());
}
return string_array;
}
std::vector<ObjectSharedPtr> Field::asObjectArray() const {
checkType(Type::Array);
return {value_.array_value_.begin(), value_.array_value_.end()};
}
std::string Field::asJsonString() const {
nlohmann::json j = asJsonDocument();
return j.dump();
}
bool Field::empty() const {
if (isType(Type::Object)) {
return value_.object_value_.empty();
} else if (isType(Type::Array)) {
return value_.array_value_.empty();
} else {
throwExceptionOrPanic(
Exception,
fmt::format("Json does not support empty() on types other than array and object"));
}
}
bool Field::hasObject(const std::string& name) const {
checkType(Type::Object);
auto value_itr = value_.object_value_.find(name);
return value_itr != value_.object_value_.end();
}
void Field::iterate(const ObjectCallback& callback) const {
checkType(Type::Object);
for (const auto& item : value_.object_value_) {
bool stop_iteration = !callback(item.first, *item.second);
if (stop_iteration) {
break;
}
}
}
void Field::validateSchema(const std::string&) const {
throwExceptionOrPanic(Exception, "not implemented");
}
bool ObjectHandler::start_object(std::size_t) {
FieldSharedPtr object = Field::createObject();
object->setLineNumberStart(line_number_);
switch (state_) {
case State::ExpectValueOrStartObjectArray:
stack_.top()->insert(key_, object);
stack_.push(object);
state_ = State::ExpectKeyOrEndObject;
return true;
case State::ExpectArrayValueOrEndArray:
stack_.top()->append(object);
stack_.push(object);
state_ = State::ExpectKeyOrEndObject;
return true;
case State::ExpectRoot:
root_ = object;
stack_.push(object);
state_ = State::ExpectKeyOrEndObject;
return true;
case State::ExpectKeyOrEndObject:
FALLTHRU;
case State::ExpectFinished:
PANIC("not implemented");
}
return false;
}
bool ObjectHandler::end_object() {
if (state_ == State::ExpectKeyOrEndObject) {
stack_.top()->setLineNumberEnd(line_number_);
stack_.pop();
if (stack_.empty()) {
state_ = State::ExpectFinished;
} else if (stack_.top()->isObject()) {
state_ = State::ExpectKeyOrEndObject;
} else if (stack_.top()->isArray()) {
state_ = State::ExpectArrayValueOrEndArray;
}
return true;
}
PANIC("parsing error not handled");
}
bool ObjectHandler::key(std::string& val) {
if (state_ == State::ExpectKeyOrEndObject) {
key_ = val;
state_ = State::ExpectValueOrStartObjectArray;
return true;
}
PANIC("parsing error not handled");
}
bool ObjectHandler::start_array(std::size_t) {
FieldSharedPtr array = Field::createArray();
array->setLineNumberStart(line_number_);
switch (state_) {
case State::ExpectValueOrStartObjectArray:
stack_.top()->insert(key_, array);
stack_.push(array);
state_ = State::ExpectArrayValueOrEndArray;
return true;
case State::ExpectArrayValueOrEndArray:
stack_.top()->append(array);
stack_.push(array);
return true;
case State::ExpectRoot:
root_ = array;
stack_.push(array);
state_ = State::ExpectArrayValueOrEndArray;
return true;
default:
PANIC("parsing error not handled");
}
}
bool ObjectHandler::end_array() {
switch (state_) {
case State::ExpectArrayValueOrEndArray:
stack_.top()->setLineNumberEnd(line_number_);
stack_.pop();
if (stack_.empty()) {
state_ = State::ExpectFinished;
} else if (stack_.top()->isObject()) {
state_ = State::ExpectKeyOrEndObject;
} else if (stack_.top()->isArray()) {
state_ = State::ExpectArrayValueOrEndArray;
}
return true;
default:
PANIC("parsing error not handled");
}
}
bool ObjectHandler::handleValueEvent(FieldSharedPtr ptr) {
ptr->setLineNumberStart(line_number_);
switch (state_) {
case State::ExpectValueOrStartObjectArray:
state_ = State::ExpectKeyOrEndObject;
stack_.top()->insert(key_, ptr);
return true;
case State::ExpectArrayValueOrEndArray:
stack_.top()->append(ptr);
return true;
default:
return true;
}
}
} // namespace
absl::StatusOr<ObjectSharedPtr> Factory::loadFromStringNoThrow(const std::string& json) {
ObjectHandler handler;
auto json_container = JsonContainer(json.c_str(), &handler);
nlohmann::json::sax_parse(json_container, &handler);
if (handler.hasParseError()) {
return absl::InternalError(fmt::format("JSON supplied is not valid. Error({}): {}\n",
handler.getErrorPosition(), handler.getParseError()));
}
return handler.getRoot();
}
ObjectSharedPtr Factory::loadFromString(const std::string& json) {
auto result = loadFromStringNoThrow(json);
if (!result.ok()) {
throwExceptionOrPanic(Exception, std::string(result.status().message()));
}
return result.value();
}
FieldSharedPtr loadFromProtobufValueInternal(const ProtobufWkt::Value& protobuf_value);
FieldSharedPtr loadFromProtobufStructInternal(const ProtobufWkt::Struct& protobuf_struct);
FieldSharedPtr loadFromProtobufValueInternal(const ProtobufWkt::Value& protobuf_value) {
switch (protobuf_value.kind_case()) {
case ProtobufWkt::Value::kStringValue:
return Field::createValue(protobuf_value.string_value());
case ProtobufWkt::Value::kNumberValue:
return Field::createValue(protobuf_value.number_value());
case ProtobufWkt::Value::kBoolValue:
return Field::createValue(protobuf_value.bool_value());
case ProtobufWkt::Value::kNullValue:
return Field::createNull();
case ProtobufWkt::Value::kListValue: {
FieldSharedPtr array = Field::createArray();
for (const auto& list_value : protobuf_value.list_value().values()) {
array->append(loadFromProtobufValueInternal(list_value));
}
return array;
}
case ProtobufWkt::Value::kStructValue:
return loadFromProtobufStructInternal(protobuf_value.struct_value());
default:
throwExceptionOrPanic(Exception, "Protobuf value case not implemented");
}
}
FieldSharedPtr loadFromProtobufStructInternal(const ProtobufWkt::Struct& protobuf_struct) {
auto root = Field::createObject();
for (const auto& field : protobuf_struct.fields()) {
root->insert(field.first, loadFromProtobufValueInternal(field.second));
}
return root;
}
ObjectSharedPtr Factory::loadFromProtobufStruct(const ProtobufWkt::Struct& protobuf_struct) {
return loadFromProtobufStructInternal(protobuf_struct);
}
std::string Factory::serialize(absl::string_view str) {
nlohmann::json j(str);
return j.dump();
}
} // namespace Nlohmann
} // namespace Json
} // namespace Envoy