forked from FerretDB/FerretDB
/
msg_hello.go
154 lines (128 loc) · 3.98 KB
/
msg_hello.go
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// Copyright 2021 FerretDB Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package handler
import (
"context"
"errors"
"strings"
"time"
"github.com/FerretDB/FerretDB/internal/handler/common"
"github.com/FerretDB/FerretDB/internal/handler/handlererrors"
"github.com/FerretDB/FerretDB/internal/types"
"github.com/FerretDB/FerretDB/internal/util/iterator"
"github.com/FerretDB/FerretDB/internal/util/lazyerrors"
"github.com/FerretDB/FerretDB/internal/util/must"
"github.com/FerretDB/FerretDB/internal/wire"
)
// MsgHello implements `hello` command.
func (h *Handler) MsgHello(ctx context.Context, msg *wire.OpMsg) (*wire.OpMsg, error) {
doc, err := msg.Document()
if err != nil {
return nil, err
}
if err := common.CheckClientMetadata(ctx, doc); err != nil {
return nil, lazyerrors.Error(err)
}
saslSupportedMechs, err := common.GetOptionalParam(doc, "saslSupportedMechs", "")
if err != nil {
return nil, lazyerrors.Error(err)
}
var saslSupportedMechsResp *types.Array
if saslSupportedMechs != "" {
db, username, ok := strings.Cut(saslSupportedMechs, ".")
if !ok {
return nil, handlererrors.NewCommandErrorMsg(
handlererrors.ErrBadValue,
"UserName must contain a '.' separated database.user pair",
)
}
// If username is empty, MongoDB doesn't send back a saslSupportedMechs property but
// still sends the response normally.
if username != "" {
mechs, err := h.getUserSupportedMechs(ctx, db, username)
if err != nil {
return nil, lazyerrors.Error(err)
}
if len(mechs) > 0 {
saslSupportedMechsResp = must.NotFail(types.NewArray())
for _, k := range mechs {
saslSupportedMechsResp.Append(k)
}
}
}
}
resp := must.NotFail(types.NewDocument(
"isWritablePrimary", true,
"maxBsonObjectSize", int32(types.MaxDocumentLen),
"maxMessageSizeBytes", int32(wire.MaxMsgLen),
"maxWriteBatchSize", int32(100000),
"localTime", time.Now(),
"connectionId", int32(42),
"minWireVersion", common.MinWireVersion,
"maxWireVersion", common.MaxWireVersion,
"readOnly", false,
))
if saslSupportedMechsResp != nil {
resp.Set("saslSupportedMechs", saslSupportedMechsResp)
}
resp.Set("ok", float64(1))
var reply wire.OpMsg
must.NoError(reply.SetSections(wire.MakeOpMsgSection(resp)))
return &reply, nil
}
// getUserSupportedMechs for a given user.
func (h *Handler) getUserSupportedMechs(ctx context.Context, db, username string) ([]string, error) {
adminDB, err := h.b.Database("admin")
if err != nil {
return nil, lazyerrors.Error(err)
}
usersCol, err := adminDB.Collection("system.users")
if err != nil {
return nil, lazyerrors.Error(err)
}
filter, err := usersInfoFilter(false, false, db, []usersInfoPair{
{username: username, db: db},
})
if err != nil {
return nil, lazyerrors.Error(err)
}
// Filter isn't being passed to the query as we are filtering after retrieving all data
// from the database due to limitations of the internal/backends filters.
qr, err := usersCol.Query(ctx, nil)
if err != nil {
return nil, lazyerrors.Error(err)
}
defer qr.Iter.Close()
for {
_, v, err := qr.Iter.Next()
if errors.Is(err, iterator.ErrIteratorDone) {
break
}
if err != nil {
return nil, lazyerrors.Error(err)
}
matches, err := common.FilterDocument(v, filter)
if err != nil {
return nil, lazyerrors.Error(err)
}
if !matches {
continue
}
if v.Has("credentials") {
credentials := must.NotFail(v.Get("credentials")).(*types.Document)
return credentials.Keys(), nil
}
}
return nil, nil
}