/**
 *    Copyright (C) 2019-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/platform/basic.h"

#include "mongo/shell/encrypted_dbclient_base.h"

#include "mongo/base/data_cursor.h"
#include "mongo/base/data_type_validated.h"
#include "mongo/bson/bson_depth.h"
#include "mongo/client/dbclient_base.h"
#include "mongo/crypto/aead_encryption.h"
#include "mongo/crypto/symmetric_crypto.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/matcher/schema/encrypt_schema_gen.h"
#include "mongo/db/namespace_string.h"
#include "mongo/rpc/object_check.h"
#include "mongo/rpc/op_msg_rpc_impls.h"
#include "mongo/scripting/mozjs/bindata.h"
#include "mongo/scripting/mozjs/implscope.h"
#include "mongo/scripting/mozjs/maxkey.h"
#include "mongo/scripting/mozjs/minkey.h"
#include "mongo/scripting/mozjs/mongo.h"
#include "mongo/scripting/mozjs/objectwrapper.h"
#include "mongo/scripting/mozjs/valuereader.h"
#include "mongo/scripting/mozjs/valuewriter.h"
#include "mongo/shell/encrypted_shell_options.h"
#include "mongo/shell/kms.h"
#include "mongo/shell/kms_gen.h"
#include "mongo/shell/shell_options.h"
#include "mongo/util/lru_cache.h"

namespace mongo {

EncryptedShellGlobalParams encryptedShellGlobalParams;

namespace {
constexpr Duration kCacheInvalidationTime = Minutes(1);


ImplicitEncryptedDBClientCallback* implicitEncryptedDBClientCallback{nullptr};


}  // namespace

void setImplicitEncryptedDBClientCallback(ImplicitEncryptedDBClientCallback* callback) {
    implicitEncryptedDBClientCallback = callback;
}

static void validateCollection(JSContext* cx, JS::HandleValue value) {
    uassert(ErrorCodes::BadValue,
            "Collection object must be provided to ClientSideFLEOptions",
            !(value.isNull() || value.isUndefined()));

    JS::RootedValue coll(cx, value);

    uassert(31043,
            "The collection object in ClientSideFLEOptions is invalid",
            mozjs::getScope(cx)->getProto<mozjs::DBCollectionInfo>().instanceOf(coll));
}

EncryptedDBClientBase::EncryptedDBClientBase(std::unique_ptr<DBClientBase> conn,
                                             ClientSideFLEOptions encryptionOptions,
                                             JS::HandleValue collection,
                                             JSContext* cx)
    : _conn(std::move(conn)), _encryptionOptions(std::move(encryptionOptions)), _cx(cx) {
    validateCollection(cx, collection);
    _collection = JS::Heap<JS::Value>(collection);
    uassert(31078,
            "Cannot use WriteMode Legacy with Field Level Encryption",
            shellGlobalParams.writeMode != "legacy");
};

std::string EncryptedDBClientBase::getServerAddress() const {
    return _conn->getServerAddress();
}

bool EncryptedDBClientBase::call(Message& toSend,
                                 Message& response,
                                 bool assertOk,
                                 std::string* actualServer) {
    return _conn->call(toSend, response, assertOk, actualServer);
}

void EncryptedDBClientBase::say(Message& toSend, bool isRetry, std::string* actualServer) {
    MONGO_UNREACHABLE;
}

bool EncryptedDBClientBase::lazySupported() const {
    return _conn->lazySupported();
}

std::pair<rpc::UniqueReply, DBClientBase*> EncryptedDBClientBase::runCommandWithTarget(
    OpMsgRequest request) {
    return _conn->runCommandWithTarget(std::move(request));
}


/**
 *
 * This function reads the data from the CDR and returns a copy
 * constructed and owned BSONObject.
 *
 */
BSONObj EncryptedDBClientBase::validateBSONElement(ConstDataRange out, uint8_t bsonType) {
    if (bsonType == BSONType::Object) {
        ConstDataRangeCursor cdc = ConstDataRangeCursor(out);
        BSONObj valueObj;

        valueObj = cdc.readAndAdvance<Validated<BSONObj>>();
        return valueObj.getOwned();
    } else {
        auto valueString = "value"_sd;

        // The size here is to construct a new BSON document and validate the
        // total size of the object. The first four bytes is for the size of an
        // int32_t, then a space for the type of the first element, then the space
        // for the value string and the the 0x00 terminated field name, then the
        // size of the actual data, then the last byte for the end document character,
        // also 0x00.
        size_t docLength = sizeof(int32_t) + 1 + valueString.size() + 1 + out.length() + 1;
        BufBuilder builder;
        builder.reserveBytes(docLength);

        uassert(ErrorCodes::BadValue,
                "invalid decryption value",
                docLength < std::numeric_limits<int32_t>::max());

        builder.appendNum(static_cast<uint32_t>(docLength));
        builder.appendChar(static_cast<uint8_t>(bsonType));
        builder.appendStr(valueString, true);
        builder.appendBuf(out.data(), out.length());
        builder.appendChar('\0');

        ConstDataRangeCursor cdc =
            ConstDataRangeCursor(ConstDataRange(builder.buf(), builder.len()));
        BSONObj elemWrapped = cdc.readAndAdvance<Validated<BSONObj>>();
        return elemWrapped.getOwned();
    }
}

std::string EncryptedDBClientBase::toString() const {
    return _conn->toString();
}

int EncryptedDBClientBase::getMinWireVersion() {
    return _conn->getMinWireVersion();
}

int EncryptedDBClientBase::getMaxWireVersion() {
    return _conn->getMaxWireVersion();
}

void EncryptedDBClientBase::generateDataKey(JSContext* cx, JS::CallArgs args) {
    if (args.length() != 2) {
        uasserted(ErrorCodes::BadValue, "generateDataKey requires 2 arg");
    }

    if (!args.get(0).isString()) {
        uasserted(ErrorCodes::BadValue, "1st param to generateDataKey has to be a string");
    }

    if (!args.get(1).isString()) {
        uasserted(ErrorCodes::BadValue, "2nd param to generateDataKey has to be a string");
    }

    std::string kmsProvider = mozjs::ValueWriter(cx, args.get(0)).toString();
    std::string clientMasterKey = mozjs::ValueWriter(cx, args.get(1)).toString();

    std::unique_ptr<KMSService> kmsService = KMSServiceController::createFromClient(
        kmsProvider, _encryptionOptions.getKmsProviders().toBSON());

    SecureVector<uint8_t> dataKey(crypto::kFieldLevelEncryptionKeySize);
    auto res = crypto::engineRandBytes(dataKey->data(), dataKey->size());
    uassert(31042, "Error generating data key: " + res.codeString(), res.isOK());

    BSONObj obj = kmsService->encryptDataKey(ConstDataRange(dataKey->data(), dataKey->size()),
                                             clientMasterKey);

    mozjs::ValueReader(cx, args.rval()).fromBSON(obj, nullptr, false);
}

void EncryptedDBClientBase::getDataKeyCollection(JSContext* cx, JS::CallArgs args) {
    if (args.length() != 0) {
        uasserted(ErrorCodes::BadValue, "getDataKeyCollection does not take any params");
    }
    args.rval().set(_collection.get());
}

void EncryptedDBClientBase::encrypt(mozjs::MozJSImplScope* scope,
                                    JSContext* cx,
                                    JS::CallArgs args) {
    // Input Validation
    uassert(ErrorCodes::BadValue, "encrypt requires 3 args", args.length() == 3);

    if (!(args.get(1).isObject() || args.get(1).isString() || args.get(1).isNumber() ||
          args.get(1).isBoolean())) {
        uasserted(ErrorCodes::BadValue,
                  "Second parameter must be an object, string, number, or bool");
    }

    uassert(ErrorCodes::BadValue, "Third parameter must be a string", args.get(2).isString());
    auto algorithmStr = mozjs::ValueWriter(cx, args.get(2)).toString();
    FleAlgorithmInt algorithm;

    if (StringData(algorithmStr) == FleAlgorithm_serializer(FleAlgorithmEnum::kRandom)) {
        algorithm = FleAlgorithmInt::kRandom;
    } else if (StringData(algorithmStr) ==
               FleAlgorithm_serializer(FleAlgorithmEnum::kDeterministic)) {
        algorithm = FleAlgorithmInt::kDeterministic;
    } else {
        uasserted(ErrorCodes::BadValue, "Third parameter must be the FLE Algorithm type");
    }

    // Extract the UUID from the callArgs
    auto binData = getBinDataArg(scope, cx, args, 0, BinDataType::newUUID);
    UUID uuid = UUID::fromCDR(ConstDataRange(binData.data(), binData.size()));
    BSONType bsonType = BSONType::EOO;

    BufBuilder plaintext;
    if (args.get(1).isObject()) {
        JS::RootedObject rootedObj(cx, &args.get(1).toObject());
        auto jsclass = JS_GetClass(rootedObj);

        if (strcmp(jsclass->name, "Object") == 0 || strcmp(jsclass->name, "Array") == 0) {
            uassert(ErrorCodes::BadValue,
                    "Cannot deterministically encrypt object or array types.",
                    algorithm != FleAlgorithmInt::kDeterministic);

            // If it is a JS Object, then we can extract all the information by simply calling
            // ValueWriter.toBSON and setting the type bit, which is what is happening below.
            BSONObj valueObj = mozjs::ValueWriter(cx, args.get(1)).toBSON();
            plaintext.appendBuf(valueObj.objdata(), valueObj.objsize());
            if (strcmp(jsclass->name, "Array") == 0) {
                bsonType = BSONType::Array;
            } else {
                bsonType = BSONType::Object;
            }

        } else if (scope->getProto<mozjs::MinKeyInfo>().getJSClass() == jsclass ||
                   scope->getProto<mozjs::MaxKeyInfo>().getJSClass() == jsclass ||
                   scope->getProto<mozjs::DBRefInfo>().getJSClass() == jsclass) {
            uasserted(ErrorCodes::BadValue, "Second parameter cannot be MinKey, MaxKey, or DBRef");
        } else {
            if (scope->getProto<mozjs::BinDataInfo>().getJSClass() == jsclass) {
                mozjs::ObjectWrapper o(cx, args.get(1));
                auto binType = BinDataType(o.getNumberInt(mozjs::InternedString::type));
                uassert(ErrorCodes::BadValue,
                        "Cannot encrypt BinData subtype 2.",
                        binType != BinDataType::ByteArrayDeprecated);
            }
            if (scope->getProto<mozjs::NumberDecimalInfo>().getJSClass() == jsclass) {
                uassert(ErrorCodes::BadValue,
                        "Cannot deterministically encrypt NumberDecimal type objects.",
                        algorithm != FleAlgorithmInt::kDeterministic);
            }

            if (scope->getProto<mozjs::CodeInfo>().getJSClass() == jsclass) {
                uassert(ErrorCodes::BadValue,
                        "Cannot deterministically encrypt Code type objects.",
                        algorithm != FleAlgorithmInt::kDeterministic);
            }

            // If it is one of our Mongo defined types, then we have to use the ValueWriter
            // writeThis function, which takes in a set of WriteFieldRecursionFrames (setting
            // a limit on how many times we can recursively dig into an object's nested
            // structure)
            // and writes the value out to a BSONObjBuilder. We can then extract that
            // information
            // from the object by building it and pulling out the first element, which is the
            // object we are trying to get.
            mozjs::ObjectWrapper::WriteFieldRecursionFrames frames;
            frames.emplace(cx, rootedObj.get(), nullptr, StringData{});
            BSONObjBuilder builder;
            mozjs::ValueWriter(cx, args.get(1)).writeThis(&builder, "value"_sd, &frames);

            BSONObj object = builder.obj();
            auto elem = object.getField("value"_sd);

            plaintext.appendBuf(elem.value(), elem.valuesize());
            bsonType = elem.type();
        }

    } else if (args.get(1).isString()) {
        std::string valueStr = mozjs::ValueWriter(cx, args.get(1)).toString();
        if (valueStr.size() + 1 > std::numeric_limits<uint32_t>::max()) {
            uasserted(ErrorCodes::BadValue, "Plaintext string to encrypt too long.");
        }

        plaintext.appendNum(static_cast<uint32_t>(valueStr.size() + 1));
        plaintext.appendStr(valueStr, true);
        bsonType = BSONType::String;

    } else if (args.get(1).isNumber()) {
        uassert(ErrorCodes::BadValue,
                "Cannot deterministically encrypt Floating Point numbers.",
                algorithm != FleAlgorithmInt::kDeterministic);

        double valueNum = mozjs::ValueWriter(cx, args.get(1)).toNumber();
        plaintext.appendNum(valueNum);
        bsonType = BSONType::NumberDouble;
    } else if (args.get(1).isBoolean()) {
        uassert(ErrorCodes::BadValue,
                "Cannot deterministically encrypt booleans.",
                algorithm != FleAlgorithmInt::kDeterministic);

        bool boolean = mozjs::ValueWriter(cx, args.get(1)).toBoolean();
        if (boolean) {
            plaintext.appendChar(0x01);
        } else {
            plaintext.appendChar(0x00);
        }
        bsonType = BSONType::Bool;
    } else {
        uasserted(ErrorCodes::BadValue, "Cannot encrypt valuetype provided.");
    }
    ConstDataRange plaintextRange(plaintext.buf(), plaintext.len());

    auto key = getDataKey(uuid);
    std::vector<uint8_t> fleBlob =
        encryptWithKey(uuid, key, plaintextRange, bsonType, FleAlgorithmInt_serializer(algorithm));

    // Prepare the return value
    std::string blobStr = base64::encode(reinterpret_cast<char*>(fleBlob.data()), fleBlob.size());
    JS::AutoValueArray<2> arr(cx);

    arr[0].setInt32(BinDataType::Encrypt);
    mozjs::ValueReader(cx, arr[1]).fromStringData(blobStr);
    scope->getProto<mozjs::BinDataInfo>().newInstance(arr, args.rval());
}

void EncryptedDBClientBase::decrypt(mozjs::MozJSImplScope* scope,
                                    JSContext* cx,
                                    JS::CallArgs args) {
    uassert(ErrorCodes::BadValue, "decrypt requires one argument", args.length() == 1);
    uassert(ErrorCodes::BadValue,
            "decrypt argument must be a BinData subtype Encrypt object",
            args.get(0).isObject());

    if (!scope->getProto<mozjs::BinDataInfo>().instanceOf(args.get(0))) {
        uasserted(ErrorCodes::BadValue,
                  "decrypt argument must be a BinData subtype Encrypt object");
    }

    JS::RootedObject obj(cx, &args.get(0).get().toObject());
    std::vector<uint8_t> binData = getBinDataArg(scope, cx, args, 0, BinDataType::Encrypt);

    uassert(
        ErrorCodes::BadValue, "Ciphertext blob too small", binData.size() > kAssociatedDataLength);
    uassert(ErrorCodes::BadValue,
            "Ciphertext blob algorithm unknown",
            (FleAlgorithmInt(binData[0]) == FleAlgorithmInt::kDeterministic ||
             FleAlgorithmInt(binData[0]) == FleAlgorithmInt::kRandom));

    ConstDataRange uuidCdr = ConstDataRange(&binData[1], UUID::kNumBytes);
    UUID uuid = UUID::fromCDR(uuidCdr);

    auto key = getDataKey(uuid);
    std::vector<uint8_t> out(binData.size() - kAssociatedDataLength);
    size_t outLen = out.size();

    auto decryptStatus = crypto::aeadDecrypt(*key,
                                             &binData[kAssociatedDataLength],
                                             binData.size() - kAssociatedDataLength,
                                             &binData[0],
                                             kAssociatedDataLength,
                                             out.data(),
                                             &outLen);
    if (!decryptStatus.isOK()) {
        uasserted(decryptStatus.code(), decryptStatus.reason());
    }

    uint8_t bsonType = binData[17];
    BSONObj parent;
    BSONObj decryptedObj = validateBSONElement(ConstDataRange(out.data(), outLen), bsonType);
    if (bsonType == BSONType::Object) {
        mozjs::ValueReader(cx, args.rval()).fromBSON(decryptedObj, &parent, true);
    } else {
        mozjs::ValueReader(cx, args.rval())
            .fromBSONElement(decryptedObj.firstElement(), parent, true);
    }
}

void EncryptedDBClientBase::trace(JSTracer* trc) {
    JS::TraceEdge(trc, &_collection, "collection object");
}

JS::Value EncryptedDBClientBase::getCollection() const {
    return _collection.get();
}


std::unique_ptr<DBClientCursor> EncryptedDBClientBase::query(const NamespaceStringOrUUID& nsOrUuid,
                                                             Query query,
                                                             int nToReturn,
                                                             int nToSkip,
                                                             const BSONObj* fieldsToReturn,
                                                             int queryOptions,
                                                             int batchSize) {
    return _conn->query(
        nsOrUuid, query, nToReturn, nToSkip, fieldsToReturn, queryOptions, batchSize);
}

bool EncryptedDBClientBase::isFailed() const {
    return _conn->isFailed();
}

bool EncryptedDBClientBase::isStillConnected() {
    return _conn->isStillConnected();
}

ConnectionString::ConnectionType EncryptedDBClientBase::type() const {
    return _conn->type();
}

double EncryptedDBClientBase::getSoTimeout() const {
    return _conn->getSoTimeout();
}

bool EncryptedDBClientBase::isReplicaSetMember() const {
    return _conn->isReplicaSetMember();
}

bool EncryptedDBClientBase::isMongos() const {
    return _conn->isMongos();
}

NamespaceString EncryptedDBClientBase::getCollectionNS() {
    JS::RootedValue fullNameRooted(_cx);
    JS::RootedObject collectionRooted(_cx, &_collection.get().toObject());
    JS_GetProperty(_cx, collectionRooted, "_fullName", &fullNameRooted);
    if (!fullNameRooted.isString()) {
        uasserted(ErrorCodes::BadValue, "Collection object is incomplete.");
    }
    std::string fullName = mozjs::ValueWriter(_cx, fullNameRooted).toString();
    NamespaceString fullNameNS = NamespaceString(fullName);
    uassert(ErrorCodes::BadValue,
            str::stream() << "Invalid namespace: " << fullName,
            fullNameNS.isValid());
    return fullNameNS;
}

std::vector<uint8_t> EncryptedDBClientBase::getBinDataArg(
    mozjs::MozJSImplScope* scope, JSContext* cx, JS::CallArgs args, int index, BinDataType type) {
    if (!args.get(index).isObject() ||
        !scope->getProto<mozjs::BinDataInfo>().instanceOf(args.get(index))) {
        uasserted(ErrorCodes::BadValue, "First parameter must be a BinData object");
    }

    mozjs::ObjectWrapper o(cx, args.get(index));

    auto binType = BinDataType(static_cast<int>(o.getNumber(mozjs::InternedString::type)));
    uassert(ErrorCodes::BadValue,
            str::stream() << "Incorrect bindata type, expected" << typeName(type) << " but got "
                          << typeName(binType),
            binType == type);
    auto str = static_cast<std::string*>(JS_GetPrivate(args.get(index).toObjectOrNull()));
    uassert(ErrorCodes::BadValue, "Cannot call getter on BinData prototype", str);
    std::string string = base64::decode(*str);
    return std::vector<uint8_t>(string.data(), string.data() + string.length());
}

std::shared_ptr<SymmetricKey> EncryptedDBClientBase::getDataKey(const UUID& uuid) {
    auto ts_new = Date_t::now();

    if (_datakeyCache.hasKey(uuid)) {
        auto[key, ts] = _datakeyCache.find(uuid)->second;
        if (ts_new - ts < kCacheInvalidationTime) {
            return key;
        } else {
            _datakeyCache.erase(uuid);
        }
    }
    auto key = getDataKeyFromDisk(uuid);
    _datakeyCache.add(uuid, std::make_pair(key, ts_new));
    return key;
}

std::shared_ptr<SymmetricKey> EncryptedDBClientBase::getDataKeyFromDisk(const UUID& uuid) {
    NamespaceString fullNameNS = getCollectionNS();
    BSONObj dataKeyObj = _conn->findOne(fullNameNS.ns(), QUERY("_id" << uuid));
    if (dataKeyObj.isEmpty()) {
        uasserted(ErrorCodes::BadValue, "Invalid keyID.");
    }

    auto keyStoreRecord = KeyStoreRecord::parse(IDLParserErrorContext("root"), dataKeyObj);
    if (dataKeyObj.hasField("version"_sd)) {
        uassert(ErrorCodes::BadValue,
                "Invalid version, must be either 0 or undefined",
                dataKeyObj.getIntField("version"_sd) == 0);
    }

    BSONElement elem = dataKeyObj.getField("keyMaterial"_sd);
    uassert(ErrorCodes::BadValue, "Invalid key.", elem.isBinData(BinDataType::BinDataGeneral));
    uassert(ErrorCodes::BadValue,
            "Invalid version, must be either 0 or undefined",
            keyStoreRecord.getVersion() == 0);

    auto dataKey = keyStoreRecord.getKeyMaterial();
    uassert(ErrorCodes::BadValue, "Invalid data key.", dataKey.length() != 0);

    std::unique_ptr<KMSService> kmsService = KMSServiceController::createFromDisk(
        _encryptionOptions.getKmsProviders().toBSON(), keyStoreRecord.getMasterKey());
    SecureVector<uint8_t> decryptedKey =
        kmsService->decrypt(dataKey, keyStoreRecord.getMasterKey());
    return std::make_shared<SymmetricKey>(
        std::move(decryptedKey), crypto::aesAlgorithm, "kms_encryption");
}

std::vector<uint8_t> EncryptedDBClientBase::encryptWithKey(UUID uuid,
                                                           const std::shared_ptr<SymmetricKey>& key,
                                                           ConstDataRange plaintext,
                                                           BSONType bsonType,
                                                           int32_t algorithm) {
    // As per the description of the encryption algorithm for FLE, the
    // associated data is constructed of the following -
    // associatedData[0] = the FleAlgorithmEnum
    //      - either a 1 or a 2 depending on whether the iv is provided.
    // associatedData[1-16] = the uuid in bytes
    // associatedData[17] = the bson type

    ConstDataRange uuidCdr = uuid.toCDR();
    uint64_t outputLength = crypto::aeadCipherOutputLength(plaintext.length());
    std::vector<uint8_t> outputBuffer(kAssociatedDataLength + outputLength);
    outputBuffer[0] = static_cast<uint8_t>(algorithm);
    std::memcpy(&outputBuffer[1], uuidCdr.data(), uuidCdr.length());
    outputBuffer[17] = static_cast<uint8_t>(bsonType);
    uassertStatusOK(crypto::aeadEncrypt(*key,
                                        reinterpret_cast<const uint8_t*>(plaintext.data()),
                                        plaintext.length(),
                                        outputBuffer.data(),
                                        18,
                                        // The ciphertext starts 18 bytes into the output
                                        // buffer, as described above.
                                        outputBuffer.data() + 18,
                                        outputLength));
    return outputBuffer;
}

namespace {

/**
 * Constructs a collection object from a namespace, passed in to the nsString parameter.
 * The client is the connection to a database in which you want to create the collection.
 * The collection parameter gets set to a javascript collection object.
 */
void createCollectionObject(JSContext* cx,
                            JS::HandleValue client,
                            StringData nsString,
                            JS::MutableHandleValue collection) {
    invariant(!client.isNull() && !client.isUndefined());

    auto ns = NamespaceString(nsString);
    uassert(ErrorCodes::BadValue,
            "Invalid keystore namespace.",
            ns.isValid() && NamespaceString::validCollectionName(ns.coll()));

    auto scope = mozjs::getScope(cx);

    // The collection object requires a database object to be constructed as well.
    JS::RootedValue databaseRV(cx);
    JS::AutoValueArray<2> databaseArgs(cx);

    databaseArgs[0].setObject(client.toObject());
    mozjs::ValueReader(cx, databaseArgs[1]).fromStringData(ns.db());
    scope->getProto<mozjs::DBInfo>().newInstance(databaseArgs, &databaseRV);

    invariant(databaseRV.isObject());
    auto databaseObj = databaseRV.toObjectOrNull();

    JS::AutoValueArray<4> collectionArgs(cx);
    collectionArgs[0].setObject(client.toObject());
    collectionArgs[1].setObject(*databaseObj);
    mozjs::ValueReader(cx, collectionArgs[2]).fromStringData(ns.coll());
    mozjs::ValueReader(cx, collectionArgs[3]).fromStringData(ns.ns());

    scope->getProto<mozjs::DBCollectionInfo>().newInstance(collectionArgs, collection);
}

// The parameters required to start FLE on the shell. The current connection is passed in as a
// parameter to create the keyvault collection object if one is not provided.
std::unique_ptr<DBClientBase> createEncryptedDBClientBase(std::unique_ptr<DBClientBase> conn,
                                                          JS::HandleValue arg,
                                                          JS::HandleObject mongoConnection,
                                                          JSContext* cx) {

    uassert(
        31038, "Invalid Client Side Encryption parameters.", arg.isObject() || arg.isUndefined());

    static constexpr auto keyVaultClientFieldId = "keyVaultClient";

    if (!arg.isObject() && encryptedShellGlobalParams.awsAccessKeyId.empty()) {
        return conn;
    }

    ClientSideFLEOptions encryptionOptions;
    JS::RootedValue client(cx);
    JS::RootedValue collection(cx);

    if (!arg.isObject()) {
        // If arg is not an object, but one of the required encryptedShellGlobalParams
        // is defined, the user is trying to start an encrypted client with command line
        // parameters.

        AwsKMS awsKms = AwsKMS(encryptedShellGlobalParams.awsAccessKeyId,
                               encryptedShellGlobalParams.awsSecretAccessKey);

        awsKms.setUrl(StringData(encryptedShellGlobalParams.awsKmsURL));

        awsKms.setSessionToken(StringData(encryptedShellGlobalParams.awsSessionToken));

        KmsProviders kmsProviders;
        kmsProviders.setAws(awsKms);

        // The mongoConnection object will never be null.
        // If the encrypted shell is started through command line parameters, then the user must
        // default to the implicit connection for the keyvault collection.
        client.setObjectOrNull(mongoConnection.get());

        // Because we cannot add a schemaMap object through the command line, we set the
        // schemaMap object in ClientSideFLEOptions to be null so we know to always use
        // remote schemas.
        encryptionOptions = ClientSideFLEOptions(encryptedShellGlobalParams.keyVaultNamespace,
                                                 std::move(kmsProviders));
    } else {
        uassert(ErrorCodes::BadValue,
                "Collection object must be passed to Field Level Encryption Options",
                arg.isObject());

        const BSONObj obj = mozjs::ValueWriter(cx, arg).toBSON();
        encryptionOptions = encryptionOptions.parse(IDLParserErrorContext("root"), obj);

        // IDL does not perform a deep copy of BSONObjs when parsing, so we must get an
        // owned copy of the schemaMap.
        if (encryptionOptions.getSchemaMap()) {
            encryptionOptions.setSchemaMap(encryptionOptions.getSchemaMap().get().getOwned());
        }

        // This logic tries to extract the client from the args. If the connection object is defined
        // in the ClientSideFLEOptions struct, then the client will extract it and set itself to be
        // that. Else, the client will default to the implicit connection.
        JS::RootedObject handleObject(cx, &arg.toObject());
        JS_GetProperty(cx, handleObject, keyVaultClientFieldId, &client);
        if (client.isNull() || client.isUndefined()) {
            client.setObjectOrNull(mongoConnection.get());
        }
    }

    createCollectionObject(cx, client, encryptionOptions.getKeyVaultNamespace(), &collection);

    if (implicitEncryptedDBClientCallback != nullptr) {
        return implicitEncryptedDBClientCallback(
            std::move(conn), encryptionOptions, collection, cx);
    }

    std::unique_ptr<EncryptedDBClientBase> base =
        std::make_unique<EncryptedDBClientBase>(std::move(conn), encryptionOptions, collection, cx);
    return std::move(base);
}

MONGO_INITIALIZER(setCallbacksForEncryptedDBClientBase)(InitializerContext*) {
    mongo::mozjs::setEncryptedDBClientCallback(createEncryptedDBClientBase);
    return Status::OK();
}

}  // namespace
}  // namespace mongo