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bson.cc
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//===========================================================================
#include <cstdlib>
#include <cstring>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-parameter"
#endif
#include <v8.h>
// this and the above block must be around the v8.h header otherwise
// v8 is not happy
#ifdef __clang__
#pragma clang diagnostic pop
#endif
#include <node.h>
#include <node_buffer.h>
#include <node_version.h>
#include <cmath>
#include <errno.h>
#include <iostream>
#include <limits>
#include <vector>
#if defined(__sun) || defined(_AIX)
#include <alloca.h>
#endif
#include "bson.h"
#include "utf8decoder.h"
void die(const char *message) {
if (errno) {
perror(message);
} else {
printf("ERROR: %s\n", message);
}
exit(1);
}
bool ValidateEncoding(const uint8_t *bytes, size_t length) {
Utf8DfaDecoder::State state = Utf8DfaDecoder::State::kAccept;
uint32_t throw_away = 0;
for (size_t i = 0; i < length && state != Utf8DfaDecoder::State::kReject;
i++) {
Utf8DfaDecoder::Decode(bytes[i], &state, &throw_away);
}
return state == Utf8DfaDecoder::State::kAccept;
}
//===========================================================================
// Equality Objects
static const char *LONG_CLASS_NAME = "Long";
static const char *OBJECT_ID_CLASS_NAME = "ObjectID";
static const char *NEW_OBJECT_ID_CLASS_NAME = "ObjectId";
static const char *BINARY_CLASS_NAME = "Binary";
static const char *CODE_CLASS_NAME = "Code";
static const char *DBREF_CLASS_NAME = "DBRef";
static const char *SYMBOL_CLASS_NAME = "BSONSymbol";
static const char *DOUBLE_CLASS_NAME = "Double";
static const char *TIMESTAMP_CLASS_NAME = "Timestamp";
static const char *MIN_KEY_CLASS_NAME = "MinKey";
static const char *MAX_KEY_CLASS_NAME = "MaxKey";
static const char *REGEXP_CLASS_NAME = "BSONRegExp";
static const char *DECIMAL128_CLASS_NAME = "Decimal128";
static const char *INT32_CLASS_NAME = "Int32";
// Equality speed up comparison objects
static const char *BSONTYPE_PROPERTY_NAME = "_bsontype";
static const char *LONG_LOW_PROPERTY_NAME = "low";
static const char *LONG_HIGH_PROPERTY_NAME = "high";
static const char *OBJECT_ID_ID_PROPERTY_NAME = "id";
static const char *BINARY_POSITION_PROPERTY_NAME = "position";
static const char *BINARY_SUBTYPE_PROPERTY_NAME = "sub_type";
static const char *BINARY_BUFFER_PROPERTY_NAME = "buffer";
static const char *SYMBOL_VALUE_PROPERTY_NAME = "value";
static const char *DECIMAL128_VALUE_PROPERTY_NAME = "bytes";
static const char *DOUBLE_VALUE_PROPERTY_NAME = "value";
static const char *INT32_VALUE_PROPERTY_NAME = "value";
static const char *DBREF_REF_PROPERTY_NAME = "$ref";
static const char *DBREF_ID_REF_PROPERTY_NAME = "$id";
static const char *DBREF_DB_REF_PROPERTY_NAME = "$db";
static const char *DBREF_NAMESPACE_PROPERTY_NAME = "collection";
static const char *DBREF_DB_PROPERTY_NAME = "db";
static const char *DBREF_FIELDS_PROPERTY_NAME = "fields";
static const char *DBREF_OID_PROPERTY_NAME = "oid";
static const char *REGEX_PATTERN_PROPERTY_NAME = "pattern";
static const char *REGEX_OPTIONS_PROPERTY_NAME = "options";
static const char *CODE_CODE_PROPERTY_NAME = "code";
static const char *CODE_SCOPE_PROPERTY_NAME = "scope";
static const char *TO_BSON_PROPERTY_NAME = "toBSON";
static const char *TO_OBJECT_PROPERTY_NAME = "toObject";
static const char *CLUSTER_TIME_PROPERTY_NAME = "$clusterTime";
// Equality Object for Map
static const char *MAP_NAME = "[object Map]";
void DataStream::WriteObjectId(const Local<Object> &object,
const Local<String> &key) {
uint16_t buffer[12];
Nan::MaybeLocal<v8::Value> obj = NanGet(object, key);
if (node::Buffer::HasInstance(obj.ToLocalChecked())) {
uint32_t length = (uint32_t)node::Buffer::Length(obj.ToLocalChecked());
this->WriteData(node::Buffer::Data(obj.ToLocalChecked()), length);
} else {
NanWrite(NanToString(NanGet(object, key)), buffer, 0, 12);
for (uint32_t i = 0; i < 12; ++i) {
*p++ = (char)buffer[i];
}
}
}
void ThrowAllocatedStringException(size_t allocationSize, const char *format,
...) {
va_list args;
va_start(args, format);
char *string = (char *)malloc(allocationSize);
if (string == NULL)
die("Failed to allocate ThrowAllocatedStringException");
vsprintf(string, format, args);
va_end(args);
throw string;
}
void DataStream::CheckKey(const Local<String> &keyName) {
size_t keyLength = NanUtf8Length(keyName);
if (keyLength == 0)
return;
// Allocate space for the key, do not need to zero terminate as WriteUtf8 does
// it
char *keyStringBuffer = (char *)alloca(keyLength + 1);
// Write the key to the allocated buffer
NanWriteUtf8(keyName, keyStringBuffer);
if (strcmp(keyStringBuffer, DBREF_REF_PROPERTY_NAME) == 0 ||
strcmp(keyStringBuffer, DBREF_ID_REF_PROPERTY_NAME) == 0 ||
strcmp(keyStringBuffer, DBREF_DB_REF_PROPERTY_NAME) == 0 ||
strcmp(keyStringBuffer, CLUSTER_TIME_PROPERTY_NAME) == 0) {
return;
}
// Check for the zero terminator
char *terminator = strchr(keyStringBuffer, 0x00);
// If the location is not at the end of the string we've got an illegal 0x00
// byte somewhere
if (terminator != &keyStringBuffer[keyLength]) {
ThrowAllocatedStringException(
64 + keyLength, "key %s must not contain null bytes", keyStringBuffer);
}
if (keyStringBuffer[0] == '$') {
ThrowAllocatedStringException(
64 + keyLength, "key %s must not start with '$'", keyStringBuffer);
}
if (strchr(keyStringBuffer, '.') != NULL) {
ThrowAllocatedStringException(64 + keyLength, "key %s must not contain '.'",
keyStringBuffer);
}
}
void DataStream::CheckForIllegalString(const Local<String> &keyName) {
size_t keyLength = NanUtf8Length(keyName);
if (keyLength == 0)
return;
// Allocate space for the key, do not need to zero terminate as WriteUtf8 does
// it
char *keyStringBuffer = (char *)alloca(keyLength + 1);
// Write the key to the allocated buffer
NanWriteUtf8(keyName, keyStringBuffer);
// Check for the zero terminator
char *terminator = strchr(keyStringBuffer, 0x00);
// If the location is not at the end of the string we've got an illegal 0x00
// byte somewhere
if (terminator != &keyStringBuffer[keyLength]) {
ThrowAllocatedStringException(
64 + keyLength, "key %s must not contain null bytes", keyStringBuffer);
}
}
template <typename T>
void BSONSerializer<T>::SerializeDocument(const Local<Value> &value) {
bool valid = this->BeginDocument();
if (!valid) {
return ThrowAllocatedStringException(64, "cyclic dependency detected");
}
void *documentSize = this->BeginWriteSize();
Local<Object> object = bson->GetSerializeObject(value);
Local<String> propertyName;
Local<Value> propertyValue;
Local<String> str = NanToString(object);
if (!str->StrictEquals(NanToString(Nan::New(bson->MAP_NAME_STR)))) {
// Get the object property names
Local<Array> propertyNames = Unmaybe(Nan::GetPropertyNames(object));
// Length of the property
int propertyLength = propertyNames->Length();
for (int i = 0; i < propertyLength; ++i) {
propertyName = NanToString(NanGet(propertyNames, i));
if (checkKeys) {
this->CheckKey(propertyName);
}
this->CheckForIllegalString(propertyName);
propertyValue = NanGet(object, propertyName);
// We are not serializing the function
if (!serializeFunctions && propertyValue->IsFunction()) {
continue;
}
// We are ignoring undefined values
if (ignoreUndefined && propertyValue->IsUndefined()) {
continue;
}
// Serialize the value
void *typeLocation = this->BeginWriteType();
this->WriteString(propertyName);
SerializeValue(typeLocation, propertyValue, false);
}
} else {
// Get the entries function
const Local<Value> &entries = NanGet(object, "entries");
if (!entries->IsFunction()) {
ThrowAllocatedStringException(64, "Map.entries is not a function");
}
// Get the iterator
Local<Object> iterator = NanToObject(
Unmaybe(Nan::Call(Local<Function>::Cast(entries), object, 0, NULL)));
// Check if we have the next value
const Local<Value> &next = NanGet(iterator, "next");
if (!next->IsFunction())
ThrowAllocatedStringException(64, "Map.iterator.next is not a function");
// Iterate until we are done
while (true) {
// Get the entry
Local<Object> entry = NanToObject(
Unmaybe(Nan::Call(Local<Function>::Cast(next), iterator, 0, NULL)));
// Check if we are done
if (NanTo<bool>(NanGet(entry, "done"))) {
break;
}
// Get the value object
Local<Object> value = NanToObject(NanGet(entry, "value"));
// Not done then lets get the value items
propertyName = NanToString(NanGet(value, "0"));
if (checkKeys)
this->CheckKey(propertyName);
// Get the property value
propertyValue = NanGet(value, "1");
// We are not serializing the function
if (!serializeFunctions && propertyValue->IsFunction()) {
continue;
}
// We are ignoring undefined values
if (ignoreUndefined && propertyValue->IsUndefined()) {
continue;
}
// Serialize the value
void *typeLocation = this->BeginWriteType();
this->WriteString(propertyName);
SerializeValue(typeLocation, propertyValue, false);
}
}
this->WriteByte(0);
this->CommitSize(documentSize);
this->EndDocument();
}
template <typename T>
void BSONSerializer<T>::SerializeArray(const Local<Value> &value) {
void *documentSize = this->BeginWriteSize();
Local<Array> array = Local<Array>::Cast(value);
uint32_t arrayLength = array->Length();
for (uint32_t i = 0; i < arrayLength; ++i) {
void *typeLocation = this->BeginWriteType();
this->WriteUInt32String(i);
if (i >= preLoadedIndex) {
SerializeValue(typeLocation, NanGet(array, i), true);
} else {
SerializeValue(typeLocation, NanGet(array, BSON::indexesStrings[i]),
true);
}
}
this->WriteByte(0);
this->CommitSize(documentSize);
}
// This is templated so that we can use this function to both count the number
// of bytes, and to serialize those bytes. The template approach eliminates
// almost all of the inspection of values unless they're required (eg. string
// lengths) and ensures that there is always consistency between bytes counted
// and bytes written by design.
template <typename T>
void BSONSerializer<T>::SerializeValue(void *typeLocation,
const Local<Value> constValue,
bool isArray) {
Local<Value> value = constValue;
// Process all the values
if (value->IsNumber()) {
double doubleValue = NanTo<double>(value);
double flooredValue = std::floor(doubleValue);
bool isNegativeZero = std::signbit(doubleValue) == true && std::fpclassify(doubleValue) == FP_ZERO;
if (isNegativeZero) {
// TODO(NODE-4335): -0 should be serialized as double
// In order to preserve consistent behavior with js-bson, serialize -0.0 as an int32
this->CommitType(typeLocation, BSON_TYPE_INT);
this->WriteInt32(0);
} else if (flooredValue == doubleValue && flooredValue <= INT32_MAX && flooredValue >= INT32_MIN) {
// If there is no fractional component and we are within an [int32.min, int32.max]
// write a bson int32
this->CommitType(typeLocation, BSON_TYPE_INT);
this->WriteInt32(flooredValue);
} else {
// otherwise write the double
this->CommitType(typeLocation, BSON_TYPE_NUMBER);
this->WriteDouble(doubleValue);
}
} else if (value->IsString()) {
this->CommitType(typeLocation, BSON_TYPE_STRING);
this->WriteLengthPrefixedString(NanToString(value));
} else if (value->IsDate()) {
this->CommitType(typeLocation, BSON_TYPE_DATE);
this->WriteInt64(value);
} else if (value->IsBoolean()) {
this->CommitType(typeLocation, BSON_TYPE_BOOLEAN);
this->WriteBool(value);
} else if (value->IsArray()) {
this->CommitType(typeLocation, BSON_TYPE_ARRAY);
SerializeArray(value);
} else if (value->IsObject()) {
Local<Object> object = NanToObject(value);
if (NanHas(object, BSONTYPE_PROPERTY_NAME)) {
const Local<String> &constructorString =
NanToString(NanGet(object, BSONTYPE_PROPERTY_NAME));
if (NanEquals(Nan::New(bson->LONG_CLASS_NAME_STR), constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_LONG);
this->WriteInt32(object, Nan::New(bson->LONG_LOW_PROPERTY_NAME_STR));
this->WriteInt32(object, Nan::New(bson->LONG_HIGH_PROPERTY_NAME_STR));
} else if (NanEquals(Nan::New(bson->TIMESTAMP_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_TIMESTAMP);
this->WriteInt32(object, Nan::New(bson->LONG_LOW_PROPERTY_NAME_STR));
this->WriteInt32(object, Nan::New(bson->LONG_HIGH_PROPERTY_NAME_STR));
} else if (NanEquals(Nan::New(bson->OBJECT_ID_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_OID);
this->WriteObjectId(object,
Nan::New(bson->OBJECT_ID_ID_PROPERTY_NAME_STR));
} else if (NanEquals(Nan::New(bson->BINARY_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_BINARY);
uint32_t length = NanTo<uint32_t>(
NanGet(object, Nan::New(bson->BINARY_POSITION_PROPERTY_NAME_STR)));
Local<Object> bufferObj = NanToObject(
NanGet(object, Nan::New(bson->BINARY_BUFFER_PROPERTY_NAME_STR)));
// Add the deprecated 02 type 4 bytes of size to total
if (NanTo<int32_t>(NanGet(
object, Nan::New(bson->BINARY_SUBTYPE_PROPERTY_NAME_STR))) ==
0x02) {
length = length + 4;
}
this->WriteInt32(length);
this->WriteByte(
object,
Nan::New(bson->BINARY_SUBTYPE_PROPERTY_NAME_STR)); // write subtype
// If type 0x02 write the array length aswell
if (NanTo<int32_t>(NanGet(
object, Nan::New(bson->BINARY_SUBTYPE_PROPERTY_NAME_STR))) ==
0x02) {
length = length - 4;
this->WriteInt32(length);
}
// Write the actual data
this->WriteData(node::Buffer::Data(bufferObj), length);
} else if (NanEquals(Nan::New(bson->DECIMAL128_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_DECIMAL128);
// Get the bytes length
uint32_t length = (uint32_t)node::Buffer::Length(
NanGet(object, Nan::New(bson->DECIMAL128_VALUE_PROPERTY_NAME_STR)));
// Get the bytes buffer object
Local<Object> bufferObj = NanToObject(
NanGet(object, Nan::New(bson->DECIMAL128_VALUE_PROPERTY_NAME_STR)));
// Write the actual decimal128 bytes
this->WriteData(node::Buffer::Data(bufferObj), length);
} else if (NanEquals(Nan::New(bson->DOUBLE_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_NUMBER);
this->WriteDouble(object,
Nan::New(bson->DOUBLE_VALUE_PROPERTY_NAME_STR));
} else if (NanEquals(Nan::New(bson->INT32_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_INT);
this->WriteInt32(object, Nan::New(bson->INT32_VALUE_PROPERTY_NAME_STR));
} else if (NanEquals(Nan::New(bson->SYMBOL_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_SYMBOL);
this->WriteLengthPrefixedString(NanToString(
NanGet(object, Nan::New(bson->SYMBOL_VALUE_PROPERTY_NAME_STR))));
} else if (NanEquals(Nan::New(bson->CODE_CLASS_NAME_STR),
constructorString)) {
const Local<String> &function = NanToString(
NanGet(object, Nan::New(bson->CODE_CODE_PROPERTY_NAME_STR)));
// Does the code object have a defined scope
bool hasScope =
NanHas(object, Nan::New(bson->CODE_SCOPE_PROPERTY_NAME_STR)) &&
NanGet(object, Nan::New(bson->CODE_SCOPE_PROPERTY_NAME_STR))
->IsObject() &&
!NanGet(object, Nan::New(bson->CODE_SCOPE_PROPERTY_NAME_STR))
->IsNull();
if (hasScope) {
const Local<Object> &scope = NanToObject(
NanGet(object, Nan::New(bson->CODE_SCOPE_PROPERTY_NAME_STR)));
this->CommitType(typeLocation, BSON_TYPE_CODE_W_SCOPE);
void *codeWidthScopeSize = this->BeginWriteSize();
this->WriteLengthPrefixedString(NanToString(function));
SerializeDocument(scope);
this->CommitSize(codeWidthScopeSize);
} else {
this->CommitType(typeLocation, BSON_TYPE_CODE);
this->WriteLengthPrefixedString(NanToString(function));
}
} else if (NanEquals(Nan::New(bson->DBREF_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_OBJECT);
void *dbRefSize = this->BeginWriteSize();
void *refType = this->BeginWriteType();
this->WriteData("$ref", 5);
SerializeValue(
refType,
NanGet(object, Nan::New(bson->DBREF_NAMESPACE_PROPERTY_NAME_STR)),
false);
void *idType = this->BeginWriteType();
this->WriteData("$id", 4);
SerializeValue(
idType, NanGet(object, Nan::New(bson->DBREF_OID_PROPERTY_NAME_STR)),
false);
const Local<Value> &refDbValue =
NanGet(object, Nan::New(bson->DBREF_DB_PROPERTY_NAME_STR));
if (!refDbValue->IsUndefined()) {
void *dbType = this->BeginWriteType();
this->WriteData("$db", 4);
SerializeValue(dbType, refDbValue, false);
}
// serialize any other values
const Local<Value> &refFieldsValue =
NanGet(object, Nan::New(bson->DBREF_FIELDS_PROPERTY_NAME_STR));
if (!refFieldsValue->IsUndefined()) {
Local<Object> fieldsObject = NanToObject(refFieldsValue);
Local<Array> propertyNames =
Unmaybe(Nan::GetPropertyNames(fieldsObject));
// Length of the property
int propertyLength = propertyNames->Length();
for (int i = 0; i < propertyLength; ++i) {
Local<String> propertyName = NanToString(NanGet(propertyNames, i));
Local<Value> propertyValue = NanGet(fieldsObject, propertyName);
// We are not serializing the function
if (!serializeFunctions && propertyValue->IsFunction()) {
continue;
}
// We are ignoring undefined values
if (ignoreUndefined && propertyValue->IsUndefined()) {
continue;
}
// Serialize the value
void *typeLocation = this->BeginWriteType();
this->WriteString(propertyName);
SerializeValue(typeLocation, propertyValue, false);
}
}
this->WriteByte(0);
this->CommitSize(dbRefSize);
} else if (NanEquals(Nan::New(bson->REGEXP_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_REGEXP);
// Get the pattern string
Local<String> pattern = NanToString(
NanGet(object, Nan::New(bson->REGEX_PATTERN_PROPERTY_NAME_STR)));
// Validate if the pattern is valid
this->CheckForIllegalString(pattern);
// Write the 0 terminated string
this->WriteString(pattern);
// Get the options string
Local<String> options = NanToString(
NanGet(object, Nan::New(bson->REGEX_OPTIONS_PROPERTY_NAME_STR)));
// Validate if the options is valid
this->CheckForIllegalString(options);
// Write the 0 terminated string
this->WriteString(options);
} else if (NanEquals(Nan::New(bson->MIN_KEY_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_MIN_KEY);
} else if (NanEquals(Nan::New(bson->MAX_KEY_CLASS_NAME_STR),
constructorString)) {
this->CommitType(typeLocation, BSON_TYPE_MAX_KEY);
}
} else if (value->IsFunction()) {
this->CommitType(typeLocation, BSON_TYPE_CODE);
this->WriteLengthPrefixedString(NanToString(value));
} else if (node::Buffer::HasInstance(value)) {
this->CommitType(typeLocation, BSON_TYPE_BINARY);
#if NODE_MAJOR_VERSION == 0 && NODE_MINOR_VERSION < 3
Local<Object> buffer = ObjectWrap::Unwrap<Buffer>(NanToObject(value));
uint32_t length = object->length();
#else
uint32_t length = (uint32_t)node::Buffer::Length(NanToObject(value));
#endif
this->WriteInt32(length);
this->WriteByte(0);
this->WriteData(node::Buffer::Data(NanToObject(value)), length);
} else if (value->IsRegExp()) {
this->CommitType(typeLocation, BSON_TYPE_REGEXP);
const Local<RegExp> ®Exp = Local<RegExp>::Cast(value);
const Local<String> regExpString = NanToString(regExp->GetSource());
// Validate if the string is valid
this->CheckForIllegalString(regExpString);
// Write the regular expression string
this->WriteString(regExpString);
// Unpack the flags
int flags = regExp->GetFlags();
if (flags & RegExp::kGlobal)
this->WriteByte('s');
if (flags & RegExp::kIgnoreCase)
this->WriteByte('i');
if (flags & RegExp::kMultiline)
this->WriteByte('m');
return this->WriteByte(0);
} else {
// Check for toBSON function
if (NanHas(object, "toBSON")) {
const Local<Value> &toBSON = NanGet(object, "toBSON");
if (!toBSON->IsFunction())
ThrowAllocatedStringException(64, "toBSON is not a function");
value =
Unmaybe(Nan::Call(Local<Function>::Cast(toBSON), object, 0, NULL));
return SerializeValue(typeLocation, value, false);
}
this->CommitType(typeLocation, BSON_TYPE_OBJECT);
SerializeDocument(value);
}
} else if (value->IsNull()) {
this->CommitType(typeLocation, BSON_TYPE_NULL);
} else if (value->IsUndefined() && !isArray && !ignoreUndefined) {
this->CommitType(typeLocation, BSON_TYPE_NULL);
} else if (value->IsUndefined() && isArray && ignoreUndefined) {
this->CommitType(typeLocation, BSON_TYPE_NULL);
} else if (value->IsUndefined() && isArray && !ignoreUndefined) {
this->CommitType(typeLocation, BSON_TYPE_NULL);
}
}
// Data points to start of element list, length is length of entire document
// including '\0' but excluding initial size
BSONDeserializer::BSONDeserializer(BSON *aBson, char *data, size_t length,
bool bsonRegExp, bool promoteLongs,
bool promoteBuffers, bool promoteValues,
Local<Object> fieldsAsRaw)
: bson(aBson), pStart(data), p(data), pEnd(data + length - 1),
bsonRegExp(bsonRegExp), promoteLongs(promoteLongs),
promoteBuffers(promoteBuffers), promoteValues(promoteValues),
fieldsAsRaw(fieldsAsRaw) {
if (*pEnd != '\0')
ThrowAllocatedStringException(64, "Missing end of document marker '\\0'");
}
BSONDeserializer::BSONDeserializer(BSONDeserializer &parentSerializer,
size_t length, bool bsonRegExp,
bool promoteLongs, bool promoteBuffers,
bool promoteValues,
Local<Object> fieldsAsRaw)
: bson(parentSerializer.bson), pStart(parentSerializer.p),
p(parentSerializer.p), pEnd(parentSerializer.p + length - 1),
bsonRegExp(bsonRegExp), promoteLongs(promoteLongs),
promoteBuffers(promoteBuffers), promoteValues(promoteValues),
fieldsAsRaw(fieldsAsRaw) {
parentSerializer.p += length;
if (pEnd > parentSerializer.pEnd)
ThrowAllocatedStringException(64, "Child document exceeds parent's bounds");
if (*pEnd != '\0')
ThrowAllocatedStringException(64, "Missing end of document marker '\\0'");
}
Local<Value> BSONDeserializer::ReadCString() {
char *start = p;
while (*p++ && (p < pEnd)) {
}
if (p > pEnd) {
ThrowAllocatedStringException(64, "Illegal CString found");
}
return Unmaybe(Nan::New<String>(start, (int32_t)(p - start - 1)));
}
int32_t BSONDeserializer::ReadJavascriptRegexOptions() {
int32_t options = 0;
for (;;) {
switch (*p++) {
case '\0':
return options;
case 's':
options |= RegExp::kGlobal;
break;
case 'i':
options |= RegExp::kIgnoreCase;
break;
case 'm':
options |= RegExp::kMultiline;
break;
default:
ThrowAllocatedStringException(
64, "Javascript RegExp option not one of s, i, m");
break;
}
}
}
int32_t BSONDeserializer::ReadBSONRegexOptions() {
int32_t options = 0;
for (;;) {
switch (*p++) {
case '\0':
return options;
case 's':
break;
case 'i':
break;
case 'l':
break;
case 'u':
break;
case 'x':
break;
case 'm':
break;
default:
ThrowAllocatedStringException(
64, "BSON RegExp option not one of s, i, l, u, x, m");
break;
}
}
}
void BSONDeserializer::ReadIntegerString() {
while (*p) {
p++;
}
++p;
}
Local<String> BSONDeserializer::ReadString() {
int32_t length = ReadInt32();
if (length <= 0 || length > (pEnd - p)) {
ThrowAllocatedStringException(64, "Invalid bson string length");
}
char *start = p;
p += length;
if (*(p - 1) != 0x00) {
ThrowAllocatedStringException(64, "Illegal bson string terminator found");
}
if (!ValidateEncoding(reinterpret_cast<const uint8_t *>(start), length - 1)) {
ThrowAllocatedStringException(64, "Invalid UTF8 string found");
}
return Unmaybe(Nan::New<String>(start, length - 1));
}
Local<Object> BSONDeserializer::ReadObjectId() {
if ((pEnd - p) < 12) {
ThrowAllocatedStringException(64, "Illegal BSON found, truncated ObjectId");
}
// Copy the data into a buffer
Local<Object> buffer = Unmaybe(Nan::CopyBuffer(p, 12));
// Move pointer
p += 12;
// Return the buffer
return Unmaybe(buffer);
}
Local<Value> BSONDeserializer::DeserializeDocument(bool raw) {
const char *start = p;
uint32_t length = ReadUInt32();
if (length < 5)
ThrowAllocatedStringException(64,
"Bad BSON: Document is less than 5 bytes");
// Do we deserialize as a raw value
if (raw) {
// Copy the whole bon object
Local<Object> buffer = Unmaybe(Nan::CopyBuffer(p - 4, length));
// Adjust the length to the end of the object
p += length - 4;
// Return the new buffer
return buffer;
}
BSONDeserializer documentDeserializer(*this, length - 4, bsonRegExp,
promoteLongs, promoteBuffers,
promoteValues, fieldsAsRaw);
// Serialize the document
Local<Value> value = documentDeserializer.DeserializeDocumentInternal();
if (length != (p - start)) {
ThrowAllocatedStringException(64, "Illegal Document Length");
}
// Return the value
return value;
}
Local<Value> BSONDeserializer::DeserializeDocumentInternal() {
Local<Object> returnObject = Unmaybe(Nan::New<Object>());
Local<String> propertyName;
bool raw = false;
bool hasDollar = false;
while (HasMoreData()) {
BsonType type = (BsonType)ReadByte();
if (*p == '$') {
hasDollar = true;
}
const Local<Value> &name = ReadCString();
if (name->IsNull())
ThrowAllocatedStringException(64, "Bad BSON Document: illegal CString");
// Special case for fieldsAsRaw matching the name and the value being a
// ARRAY
if (type == BSON_TYPE_ARRAY &&
!Nan::MaybeLocal<Object>(fieldsAsRaw).IsEmpty()) {
// Get the object property names
Local<Array> propertyNames = Unmaybe(Nan::GetPropertyNames(fieldsAsRaw));
// Length of the property
int propertyLength = propertyNames->Length();
for (int i = 0; i < propertyLength; ++i) {
propertyName = NanToString(NanGet(propertyNames, i));
// We found a field that matches name wise, we now want to return a raw
// buffer instead of deserializing the array;
if (name->StrictEquals(propertyName)) {
raw = true;
}
}
}
// Deserialize the value
const Local<Value> &value = DeserializeValue(type, raw);
Nan::Set(returnObject, name, value);
}
if (p != pEnd)
ThrowAllocatedStringException(
64, "Bad BSON Document: Serialize consumed unexpected number of bytes");
// Determine if we need to return a DBRef or not
if (hasDollar) {
Local<Value> dbRefRefValue = NanGet(returnObject, DBREF_REF_PROPERTY_NAME);
Local<Value> dbRefIdValue = NanGet(returnObject, DBREF_ID_REF_PROPERTY_NAME);
Local<Value> dbRefDbValue = NanGet(returnObject, DBREF_DB_REF_PROPERTY_NAME);
if (!dbRefRefValue->IsUndefined() && !dbRefIdValue->IsUndefined()) {
Local<Object> fieldsObject = Unmaybe(Nan::New<Object>());
Local<Array> propertyNames = Unmaybe(Nan::GetPropertyNames(returnObject));
int propertyLength = propertyNames->Length();
for (int i = 0; i < propertyLength; ++i) {
propertyName = NanToString(NanGet(propertyNames, i));
// First check if we have an invalid escaped key
std::string check(*Nan::Utf8String(propertyName));
if (check[0] == '$' &&
(strcmp(check.c_str(), DBREF_REF_PROPERTY_NAME) != 0 &&
strcmp(check.c_str(), DBREF_ID_REF_PROPERTY_NAME) != 0 &&
strcmp(check.c_str(), DBREF_DB_REF_PROPERTY_NAME) != 0)) {
// this is not a proper DBRef, we're safe to just return the
// returnObject
return returnObject;
}
// Now build up the `fields` object
if (strcmp(check.c_str(), DBREF_REF_PROPERTY_NAME) == 0 ||
strcmp(check.c_str(), DBREF_ID_REF_PROPERTY_NAME) == 0 ||
strcmp(check.c_str(), DBREF_DB_REF_PROPERTY_NAME) == 0) {
continue;
}
Nan::Set(fieldsObject, propertyName, NanGet(returnObject, propertyName));
}
Local<Value> argv[] = {dbRefRefValue, dbRefIdValue, dbRefDbValue,
fieldsObject};
Nan::MaybeLocal<Object> obj =
Nan::NewInstance(Nan::New(bson->dbrefConstructor), 4, argv);
return obj.ToLocalChecked();
}
}
return returnObject;
}
Local<Value> BSONDeserializer::DeserializeArray(bool raw) {
uint32_t length = ReadUInt32();
if (length < 5)
ThrowAllocatedStringException(
64, "Bad BSON: Array Document is less than 5 bytes");
BSONDeserializer documentDeserializer(*this, length - 4, bsonRegExp,
promoteLongs, promoteBuffers,
promoteValues, fieldsAsRaw);
return documentDeserializer.DeserializeArrayInternal(raw);
}
Local<Value> BSONDeserializer::DeserializeArrayInternal(bool raw) {
Local<Array> returnArray = Unmaybe(Nan::New<Array>());
uint32_t index = 0;
while (HasMoreData()) {
BsonType type = (BsonType)ReadByte();
ReadIntegerString();
const Local<Value> &value = DeserializeValue(type, raw);
if (index >= preLoadedIndex) {
Nan::Set(returnArray, Nan::New<Integer>(index++), value);
} else {
Nan::Set(returnArray, Nan::New(BSON::indexes[index++]), value);
}
}
if (p != pEnd)
ThrowAllocatedStringException(
64, "Bad BSON Array: Serialize consumed unexpected number of bytes");
return returnArray;
}
Local<Value> BSONDeserializer::DeserializeValue(BsonType type, bool raw) {
switch (type) {
case BSON_TYPE_STRING: {
return ReadString();
}
case BSON_TYPE_INT: {
if ((pEnd - p) < 4) {
ThrowAllocatedStringException(64, "Illegal BSON found, truncated Int32");
}
Local<Value> value = Nan::New<Integer>(ReadInt32());
if (!promoteValues) {
Local<Value> argv[] = {value};
Nan::MaybeLocal<Object> obj =
Nan::NewInstance(Nan::New(bson->int32Constructor), 1, argv);
return obj.ToLocalChecked();
}
return value;
}
case BSON_TYPE_NUMBER: {
if ((pEnd - p) < 8) {
ThrowAllocatedStringException(64, "Illegal BSON found, truncated Double");
}
Local<Value> value = Nan::New<Number>(ReadDouble());
if (!promoteValues) {
Local<Value> argv[] = {value};
Nan::MaybeLocal<Object> obj =
Nan::NewInstance(Nan::New(bson->doubleConstructor), 1, argv);
return obj.ToLocalChecked();
}
return value;
}
case BSON_TYPE_NULL:
return Nan::Null();
case BSON_TYPE_UNDEFINED:
return Nan::Undefined();
case BSON_TYPE_TIMESTAMP: {
if ((pEnd - p) < 8) {
ThrowAllocatedStringException(64,
"Illegal BSON found, truncated Timestamp");
}
int32_t lowBits = ReadInt32();
int32_t highBits = ReadInt32();
Local<Value> argv[] = {Nan::New<Int32>(lowBits), Nan::New<Int32>(highBits)};
Nan::MaybeLocal<Object> obj =
Nan::NewInstance(Nan::New(bson->timestampConstructor), 2, argv);
return obj.ToLocalChecked();
}
case BSON_TYPE_BOOLEAN: {
char value = ReadByte();
if (value != 0 && value != 1) {
ThrowAllocatedStringException(64, "Illegal BSON Binary value");
}
return (value != 0) ? Nan::True() : Nan::False();
}
case BSON_TYPE_REGEXP: {
const Local<Value> ®ex = ReadCString();
if (regex->IsNull())
ThrowAllocatedStringException(64, "Bad BSON Document: illegal CString");
if (bsonRegExp) {
// Save pointer
char *start = p;
// Read and validate options
ReadBSONRegexOptions();
// Reset read pointer
p = start;
// Read the options
const Local<Value> &options = ReadCString();
Local<Value> argv[] = {regex, options};
Nan::MaybeLocal<Object> obj =
Nan::NewInstance(Nan::New(bson->regexpConstructor), 2, argv);
return obj.ToLocalChecked();
} else {
int32_t options = ReadJavascriptRegexOptions();
return Unmaybe(
Nan::New<RegExp>(NanToString(regex), (RegExp::Flags)options));
}
}
case BSON_TYPE_CODE: {
const Local<String> &code = ReadString();
Local<Value> argv[] = {code, Nan::Undefined()};