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svrjs-blog-newsletter/backend/node_modules/bson/lib/parser/deserializer.js

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2024-05-26 22:54:55 +02:00
"use strict";
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.deserialize = void 0;
var buffer_1 = require("buffer");
var binary_1 = require("../binary");
var code_1 = require("../code");
var constants = require("../constants");
var db_ref_1 = require("../db_ref");
var decimal128_1 = require("../decimal128");
var double_1 = require("../double");
var error_1 = require("../error");
var int_32_1 = require("../int_32");
var long_1 = require("../long");
var max_key_1 = require("../max_key");
var min_key_1 = require("../min_key");
var objectid_1 = require("../objectid");
var regexp_1 = require("../regexp");
var symbol_1 = require("../symbol");
var timestamp_1 = require("../timestamp");
var validate_utf8_1 = require("../validate_utf8");
// Internal long versions
var JS_INT_MAX_LONG = long_1.Long.fromNumber(constants.JS_INT_MAX);
var JS_INT_MIN_LONG = long_1.Long.fromNumber(constants.JS_INT_MIN);
var functionCache = {};
function deserialize(buffer, options, isArray) {
options = options == null ? {} : options;
var index = options && options.index ? options.index : 0;
// Read the document size
var size = buffer[index] |
(buffer[index + 1] << 8) |
(buffer[index + 2] << 16) |
(buffer[index + 3] << 24);
if (size < 5) {
throw new error_1.BSONError("bson size must be >= 5, is ".concat(size));
}
if (options.allowObjectSmallerThanBufferSize && buffer.length < size) {
throw new error_1.BSONError("buffer length ".concat(buffer.length, " must be >= bson size ").concat(size));
}
if (!options.allowObjectSmallerThanBufferSize && buffer.length !== size) {
throw new error_1.BSONError("buffer length ".concat(buffer.length, " must === bson size ").concat(size));
}
if (size + index > buffer.byteLength) {
throw new error_1.BSONError("(bson size ".concat(size, " + options.index ").concat(index, " must be <= buffer length ").concat(buffer.byteLength, ")"));
}
// Illegal end value
if (buffer[index + size - 1] !== 0) {
throw new error_1.BSONError("One object, sized correctly, with a spot for an EOO, but the EOO isn't 0x00");
}
// Start deserializtion
return deserializeObject(buffer, index, options, isArray);
}
exports.deserialize = deserialize;
var allowedDBRefKeys = /^\$ref$|^\$id$|^\$db$/;
function deserializeObject(buffer, index, options, isArray) {
if (isArray === void 0) { isArray = false; }
var evalFunctions = options['evalFunctions'] == null ? false : options['evalFunctions'];
var cacheFunctions = options['cacheFunctions'] == null ? false : options['cacheFunctions'];
var fieldsAsRaw = options['fieldsAsRaw'] == null ? null : options['fieldsAsRaw'];
// Return raw bson buffer instead of parsing it
var raw = options['raw'] == null ? false : options['raw'];
// Return BSONRegExp objects instead of native regular expressions
var bsonRegExp = typeof options['bsonRegExp'] === 'boolean' ? options['bsonRegExp'] : false;
// Controls the promotion of values vs wrapper classes
var promoteBuffers = options['promoteBuffers'] == null ? false : options['promoteBuffers'];
var promoteLongs = options['promoteLongs'] == null ? true : options['promoteLongs'];
var promoteValues = options['promoteValues'] == null ? true : options['promoteValues'];
// Ensures default validation option if none given
var validation = options.validation == null ? { utf8: true } : options.validation;
// Shows if global utf-8 validation is enabled or disabled
var globalUTFValidation = true;
// Reflects utf-8 validation setting regardless of global or specific key validation
var validationSetting;
// Set of keys either to enable or disable validation on
var utf8KeysSet = new Set();
// Check for boolean uniformity and empty validation option
var utf8ValidatedKeys = validation.utf8;
if (typeof utf8ValidatedKeys === 'boolean') {
validationSetting = utf8ValidatedKeys;
}
else {
globalUTFValidation = false;
var utf8ValidationValues = Object.keys(utf8ValidatedKeys).map(function (key) {
return utf8ValidatedKeys[key];
});
if (utf8ValidationValues.length === 0) {
throw new error_1.BSONError('UTF-8 validation setting cannot be empty');
}
if (typeof utf8ValidationValues[0] !== 'boolean') {
throw new error_1.BSONError('Invalid UTF-8 validation option, must specify boolean values');
}
validationSetting = utf8ValidationValues[0];
// Ensures boolean uniformity in utf-8 validation (all true or all false)
if (!utf8ValidationValues.every(function (item) { return item === validationSetting; })) {
throw new error_1.BSONError('Invalid UTF-8 validation option - keys must be all true or all false');
}
}
// Add keys to set that will either be validated or not based on validationSetting
if (!globalUTFValidation) {
for (var _i = 0, _a = Object.keys(utf8ValidatedKeys); _i < _a.length; _i++) {
var key = _a[_i];
utf8KeysSet.add(key);
}
}
// Set the start index
var startIndex = index;
// Validate that we have at least 4 bytes of buffer
if (buffer.length < 5)
throw new error_1.BSONError('corrupt bson message < 5 bytes long');
// Read the document size
var size = buffer[index++] | (buffer[index++] << 8) | (buffer[index++] << 16) | (buffer[index++] << 24);
// Ensure buffer is valid size
if (size < 5 || size > buffer.length)
throw new error_1.BSONError('corrupt bson message');
// Create holding object
var object = isArray ? [] : {};
// Used for arrays to skip having to perform utf8 decoding
var arrayIndex = 0;
var done = false;
var isPossibleDBRef = isArray ? false : null;
// While we have more left data left keep parsing
var dataview = new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength);
while (!done) {
// Read the type
var elementType = buffer[index++];
// If we get a zero it's the last byte, exit
if (elementType === 0)
break;
// Get the start search index
var i = index;
// Locate the end of the c string
while (buffer[i] !== 0x00 && i < buffer.length) {
i++;
}
// If are at the end of the buffer there is a problem with the document
if (i >= buffer.byteLength)
throw new error_1.BSONError('Bad BSON Document: illegal CString');
// Represents the key
var name = isArray ? arrayIndex++ : buffer.toString('utf8', index, i);
// shouldValidateKey is true if the key should be validated, false otherwise
var shouldValidateKey = true;
if (globalUTFValidation || utf8KeysSet.has(name)) {
shouldValidateKey = validationSetting;
}
else {
shouldValidateKey = !validationSetting;
}
if (isPossibleDBRef !== false && name[0] === '$') {
isPossibleDBRef = allowedDBRefKeys.test(name);
}
var value = void 0;
index = i + 1;
if (elementType === constants.BSON_DATA_STRING) {
var stringSize = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
if (stringSize <= 0 ||
stringSize > buffer.length - index ||
buffer[index + stringSize - 1] !== 0) {
throw new error_1.BSONError('bad string length in bson');
}
value = getValidatedString(buffer, index, index + stringSize - 1, shouldValidateKey);
index = index + stringSize;
}
else if (elementType === constants.BSON_DATA_OID) {
var oid = buffer_1.Buffer.alloc(12);
buffer.copy(oid, 0, index, index + 12);
value = new objectid_1.ObjectId(oid);
index = index + 12;
}
else if (elementType === constants.BSON_DATA_INT && promoteValues === false) {
value = new int_32_1.Int32(buffer[index++] | (buffer[index++] << 8) | (buffer[index++] << 16) | (buffer[index++] << 24));
}
else if (elementType === constants.BSON_DATA_INT) {
value =
buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
}
else if (elementType === constants.BSON_DATA_NUMBER && promoteValues === false) {
value = new double_1.Double(dataview.getFloat64(index, true));
index = index + 8;
}
else if (elementType === constants.BSON_DATA_NUMBER) {
value = dataview.getFloat64(index, true);
index = index + 8;
}
else if (elementType === constants.BSON_DATA_DATE) {
var lowBits = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
var highBits = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
value = new Date(new long_1.Long(lowBits, highBits).toNumber());
}
else if (elementType === constants.BSON_DATA_BOOLEAN) {
if (buffer[index] !== 0 && buffer[index] !== 1)
throw new error_1.BSONError('illegal boolean type value');
value = buffer[index++] === 1;
}
else if (elementType === constants.BSON_DATA_OBJECT) {
var _index = index;
var objectSize = buffer[index] |
(buffer[index + 1] << 8) |
(buffer[index + 2] << 16) |
(buffer[index + 3] << 24);
if (objectSize <= 0 || objectSize > buffer.length - index)
throw new error_1.BSONError('bad embedded document length in bson');
// We have a raw value
if (raw) {
value = buffer.slice(index, index + objectSize);
}
else {
var objectOptions = options;
if (!globalUTFValidation) {
objectOptions = __assign(__assign({}, options), { validation: { utf8: shouldValidateKey } });
}
value = deserializeObject(buffer, _index, objectOptions, false);
}
index = index + objectSize;
}
else if (elementType === constants.BSON_DATA_ARRAY) {
var _index = index;
var objectSize = buffer[index] |
(buffer[index + 1] << 8) |
(buffer[index + 2] << 16) |
(buffer[index + 3] << 24);
var arrayOptions = options;
// Stop index
var stopIndex = index + objectSize;
// All elements of array to be returned as raw bson
if (fieldsAsRaw && fieldsAsRaw[name]) {
arrayOptions = {};
for (var n in options) {
arrayOptions[n] = options[n];
}
arrayOptions['raw'] = true;
}
if (!globalUTFValidation) {
arrayOptions = __assign(__assign({}, arrayOptions), { validation: { utf8: shouldValidateKey } });
}
value = deserializeObject(buffer, _index, arrayOptions, true);
index = index + objectSize;
if (buffer[index - 1] !== 0)
throw new error_1.BSONError('invalid array terminator byte');
if (index !== stopIndex)
throw new error_1.BSONError('corrupted array bson');
}
else if (elementType === constants.BSON_DATA_UNDEFINED) {
value = undefined;
}
else if (elementType === constants.BSON_DATA_NULL) {
value = null;
}
else if (elementType === constants.BSON_DATA_LONG) {
// Unpack the low and high bits
var lowBits = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
var highBits = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
var long = new long_1.Long(lowBits, highBits);
// Promote the long if possible
if (promoteLongs && promoteValues === true) {
value =
long.lessThanOrEqual(JS_INT_MAX_LONG) && long.greaterThanOrEqual(JS_INT_MIN_LONG)
? long.toNumber()
: long;
}
else {
value = long;
}
}
else if (elementType === constants.BSON_DATA_DECIMAL128) {
// Buffer to contain the decimal bytes
var bytes = buffer_1.Buffer.alloc(16);
// Copy the next 16 bytes into the bytes buffer
buffer.copy(bytes, 0, index, index + 16);
// Update index
index = index + 16;
// Assign the new Decimal128 value
var decimal128 = new decimal128_1.Decimal128(bytes);
// If we have an alternative mapper use that
if ('toObject' in decimal128 && typeof decimal128.toObject === 'function') {
value = decimal128.toObject();
}
else {
value = decimal128;
}
}
else if (elementType === constants.BSON_DATA_BINARY) {
var binarySize = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
var totalBinarySize = binarySize;
var subType = buffer[index++];
// Did we have a negative binary size, throw
if (binarySize < 0)
throw new error_1.BSONError('Negative binary type element size found');
// Is the length longer than the document
if (binarySize > buffer.byteLength)
throw new error_1.BSONError('Binary type size larger than document size');
// Decode as raw Buffer object if options specifies it
if (buffer['slice'] != null) {
// If we have subtype 2 skip the 4 bytes for the size
if (subType === binary_1.Binary.SUBTYPE_BYTE_ARRAY) {
binarySize =
buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
if (binarySize < 0)
throw new error_1.BSONError('Negative binary type element size found for subtype 0x02');
if (binarySize > totalBinarySize - 4)
throw new error_1.BSONError('Binary type with subtype 0x02 contains too long binary size');
if (binarySize < totalBinarySize - 4)
throw new error_1.BSONError('Binary type with subtype 0x02 contains too short binary size');
}
if (promoteBuffers && promoteValues) {
value = buffer.slice(index, index + binarySize);
}
else {
value = new binary_1.Binary(buffer.slice(index, index + binarySize), subType);
if (subType === constants.BSON_BINARY_SUBTYPE_UUID_NEW) {
value = value.toUUID();
}
}
}
else {
var _buffer = buffer_1.Buffer.alloc(binarySize);
// If we have subtype 2 skip the 4 bytes for the size
if (subType === binary_1.Binary.SUBTYPE_BYTE_ARRAY) {
binarySize =
buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
if (binarySize < 0)
throw new error_1.BSONError('Negative binary type element size found for subtype 0x02');
if (binarySize > totalBinarySize - 4)
throw new error_1.BSONError('Binary type with subtype 0x02 contains too long binary size');
if (binarySize < totalBinarySize - 4)
throw new error_1.BSONError('Binary type with subtype 0x02 contains too short binary size');
}
// Copy the data
for (i = 0; i < binarySize; i++) {
_buffer[i] = buffer[index + i];
}
if (promoteBuffers && promoteValues) {
value = _buffer;
}
else if (subType === constants.BSON_BINARY_SUBTYPE_UUID_NEW) {
value = new binary_1.Binary(buffer.slice(index, index + binarySize), subType).toUUID();
}
else {
value = new binary_1.Binary(buffer.slice(index, index + binarySize), subType);
}
}
// Update the index
index = index + binarySize;
}
else if (elementType === constants.BSON_DATA_REGEXP && bsonRegExp === false) {
// Get the start search index
i = index;
// Locate the end of the c string
while (buffer[i] !== 0x00 && i < buffer.length) {
i++;
}
// If are at the end of the buffer there is a problem with the document
if (i >= buffer.length)
throw new error_1.BSONError('Bad BSON Document: illegal CString');
// Return the C string
var source = buffer.toString('utf8', index, i);
// Create the regexp
index = i + 1;
// Get the start search index
i = index;
// Locate the end of the c string
while (buffer[i] !== 0x00 && i < buffer.length) {
i++;
}
// If are at the end of the buffer there is a problem with the document
if (i >= buffer.length)
throw new error_1.BSONError('Bad BSON Document: illegal CString');
// Return the C string
var regExpOptions = buffer.toString('utf8', index, i);
index = i + 1;
// For each option add the corresponding one for javascript
var optionsArray = new Array(regExpOptions.length);
// Parse options
for (i = 0; i < regExpOptions.length; i++) {
switch (regExpOptions[i]) {
case 'm':
optionsArray[i] = 'm';
break;
case 's':
optionsArray[i] = 'g';
break;
case 'i':
optionsArray[i] = 'i';
break;
}
}
value = new RegExp(source, optionsArray.join(''));
}
else if (elementType === constants.BSON_DATA_REGEXP && bsonRegExp === true) {
// Get the start search index
i = index;
// Locate the end of the c string
while (buffer[i] !== 0x00 && i < buffer.length) {
i++;
}
// If are at the end of the buffer there is a problem with the document
if (i >= buffer.length)
throw new error_1.BSONError('Bad BSON Document: illegal CString');
// Return the C string
var source = buffer.toString('utf8', index, i);
index = i + 1;
// Get the start search index
i = index;
// Locate the end of the c string
while (buffer[i] !== 0x00 && i < buffer.length) {
i++;
}
// If are at the end of the buffer there is a problem with the document
if (i >= buffer.length)
throw new error_1.BSONError('Bad BSON Document: illegal CString');
// Return the C string
var regExpOptions = buffer.toString('utf8', index, i);
index = i + 1;
// Set the object
value = new regexp_1.BSONRegExp(source, regExpOptions);
}
else if (elementType === constants.BSON_DATA_SYMBOL) {
var stringSize = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
if (stringSize <= 0 ||
stringSize > buffer.length - index ||
buffer[index + stringSize - 1] !== 0) {
throw new error_1.BSONError('bad string length in bson');
}
var symbol = getValidatedString(buffer, index, index + stringSize - 1, shouldValidateKey);
value = promoteValues ? symbol : new symbol_1.BSONSymbol(symbol);
index = index + stringSize;
}
else if (elementType === constants.BSON_DATA_TIMESTAMP) {
var lowBits = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
var highBits = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
value = new timestamp_1.Timestamp(lowBits, highBits);
}
else if (elementType === constants.BSON_DATA_MIN_KEY) {
value = new min_key_1.MinKey();
}
else if (elementType === constants.BSON_DATA_MAX_KEY) {
value = new max_key_1.MaxKey();
}
else if (elementType === constants.BSON_DATA_CODE) {
var stringSize = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
if (stringSize <= 0 ||
stringSize > buffer.length - index ||
buffer[index + stringSize - 1] !== 0) {
throw new error_1.BSONError('bad string length in bson');
}
var functionString = getValidatedString(buffer, index, index + stringSize - 1, shouldValidateKey);
// If we are evaluating the functions
if (evalFunctions) {
// If we have cache enabled let's look for the md5 of the function in the cache
if (cacheFunctions) {
// Got to do this to avoid V8 deoptimizing the call due to finding eval
value = isolateEval(functionString, functionCache, object);
}
else {
value = isolateEval(functionString);
}
}
else {
value = new code_1.Code(functionString);
}
// Update parse index position
index = index + stringSize;
}
else if (elementType === constants.BSON_DATA_CODE_W_SCOPE) {
var totalSize = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
// Element cannot be shorter than totalSize + stringSize + documentSize + terminator
if (totalSize < 4 + 4 + 4 + 1) {
throw new error_1.BSONError('code_w_scope total size shorter minimum expected length');
}
// Get the code string size
var stringSize = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
// Check if we have a valid string
if (stringSize <= 0 ||
stringSize > buffer.length - index ||
buffer[index + stringSize - 1] !== 0) {
throw new error_1.BSONError('bad string length in bson');
}
// Javascript function
var functionString = getValidatedString(buffer, index, index + stringSize - 1, shouldValidateKey);
// Update parse index position
index = index + stringSize;
// Parse the element
var _index = index;
// Decode the size of the object document
var objectSize = buffer[index] |
(buffer[index + 1] << 8) |
(buffer[index + 2] << 16) |
(buffer[index + 3] << 24);
// Decode the scope object
var scopeObject = deserializeObject(buffer, _index, options, false);
// Adjust the index
index = index + objectSize;
// Check if field length is too short
if (totalSize < 4 + 4 + objectSize + stringSize) {
throw new error_1.BSONError('code_w_scope total size is too short, truncating scope');
}
// Check if totalSize field is too long
if (totalSize > 4 + 4 + objectSize + stringSize) {
throw new error_1.BSONError('code_w_scope total size is too long, clips outer document');
}
// If we are evaluating the functions
if (evalFunctions) {
// If we have cache enabled let's look for the md5 of the function in the cache
if (cacheFunctions) {
// Got to do this to avoid V8 deoptimizing the call due to finding eval
value = isolateEval(functionString, functionCache, object);
}
else {
value = isolateEval(functionString);
}
value.scope = scopeObject;
}
else {
value = new code_1.Code(functionString, scopeObject);
}
}
else if (elementType === constants.BSON_DATA_DBPOINTER) {
// Get the code string size
var stringSize = buffer[index++] |
(buffer[index++] << 8) |
(buffer[index++] << 16) |
(buffer[index++] << 24);
// Check if we have a valid string
if (stringSize <= 0 ||
stringSize > buffer.length - index ||
buffer[index + stringSize - 1] !== 0)
throw new error_1.BSONError('bad string length in bson');
// Namespace
if (validation != null && validation.utf8) {
if (!(0, validate_utf8_1.validateUtf8)(buffer, index, index + stringSize - 1)) {
throw new error_1.BSONError('Invalid UTF-8 string in BSON document');
}
}
var namespace = buffer.toString('utf8', index, index + stringSize - 1);
// Update parse index position
index = index + stringSize;
// Read the oid
var oidBuffer = buffer_1.Buffer.alloc(12);
buffer.copy(oidBuffer, 0, index, index + 12);
var oid = new objectid_1.ObjectId(oidBuffer);
// Update the index
index = index + 12;
// Upgrade to DBRef type
value = new db_ref_1.DBRef(namespace, oid);
}
else {
throw new error_1.BSONError("Detected unknown BSON type ".concat(elementType.toString(16), " for fieldname \"").concat(name, "\""));
}
if (name === '__proto__') {
Object.defineProperty(object, name, {
value: value,
writable: true,
enumerable: true,
configurable: true
});
}
else {
object[name] = value;
}
}
// Check if the deserialization was against a valid array/object
if (size !== index - startIndex) {
if (isArray)
throw new error_1.BSONError('corrupt array bson');
throw new error_1.BSONError('corrupt object bson');
}
// if we did not find "$ref", "$id", "$db", or found an extraneous $key, don't make a DBRef
if (!isPossibleDBRef)
return object;
if ((0, db_ref_1.isDBRefLike)(object)) {
var copy = Object.assign({}, object);
delete copy.$ref;
delete copy.$id;
delete copy.$db;
return new db_ref_1.DBRef(object.$ref, object.$id, object.$db, copy);
}
return object;
}
/**
* Ensure eval is isolated, store the result in functionCache.
*
* @internal
*/
function isolateEval(functionString, functionCache, object) {
// eslint-disable-next-line @typescript-eslint/no-implied-eval
if (!functionCache)
return new Function(functionString);
// Check for cache hit, eval if missing and return cached function
if (functionCache[functionString] == null) {
// eslint-disable-next-line @typescript-eslint/no-implied-eval
functionCache[functionString] = new Function(functionString);
}
// Set the object
return functionCache[functionString].bind(object);
}
function getValidatedString(buffer, start, end, shouldValidateUtf8) {
var value = buffer.toString('utf8', start, end);
// if utf8 validation is on, do the check
if (shouldValidateUtf8) {
for (var i = 0; i < value.length; i++) {
if (value.charCodeAt(i) === 0xfffd) {
if (!(0, validate_utf8_1.validateUtf8)(buffer, start, end)) {
throw new error_1.BSONError('Invalid UTF-8 string in BSON document');
}
break;
}
}
}
return value;
}
//# sourceMappingURL=deserializer.js.map