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storage_msgengine.go
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storage_msgengine.go
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package storage
import (
"fmt"
"github.com/keybase/client/go/chat/utils"
"github.com/keybase/client/go/libkb"
"github.com/keybase/client/go/protocol/chat1"
"github.com/keybase/client/go/protocol/gregor1"
"golang.org/x/crypto/nacl/secretbox"
"golang.org/x/net/context"
)
type msgEngine struct {
libkb.Contextified
utils.DebugLabeler
}
type boxedLocalMessage struct {
MsgID chat1.MessageID `codec:"I"`
MsgType chat1.MessageType `codec:"T"`
V int `codec:"V"`
E []byte `codec:"E"`
N [24]byte `codec:"N"`
}
func (b boxedLocalMessage) GetMessageID() chat1.MessageID {
return b.MsgID
}
func (b boxedLocalMessage) GetMessageType() chat1.MessageType {
return b.MsgType
}
func newMsgEngine(g *libkb.GlobalContext) *msgEngine {
return &msgEngine{
Contextified: libkb.NewContextified(g),
DebugLabeler: utils.NewDebugLabeler(g, "MessageEngine", true),
}
}
func (ms *msgEngine) fetchSecretKey(ctx context.Context) (key [32]byte, err Error) {
var ok bool
val := ctx.Value(beskkey)
if key, ok = val.([32]byte); !ok {
return key, MiscError{Msg: "secret key not in context"}
}
return key, nil
}
func (ms *msgEngine) makeMsgKey(convID chat1.ConversationID, uid gregor1.UID, msgID chat1.MessageID) libkb.DbKey {
return libkb.DbKey{
Typ: libkb.DBChatBlocks,
Key: fmt.Sprintf("msg:%s:%s:%d", uid, convID, msgID),
}
}
func (ms *msgEngine) WriteMessages(ctx context.Context, convID chat1.ConversationID, uid gregor1.UID,
msgs []chat1.MessageUnboxed) Error {
// Sanity check
if len(msgs) == 0 {
return nil
}
// Write out all the messages
for _, msg := range msgs {
// Encode message
dat, err := encode(msg)
if err != nil {
return NewInternalError(ctx, ms.DebugLabeler, "writeMessages: failed to encode: %s",
err.Error())
}
// Encrypt message
key, cerr := ms.fetchSecretKey(ctx)
if cerr != nil {
return cerr
}
var nonce []byte
nonce, err = libkb.RandBytes(24)
if err != nil {
return MiscError{Msg: fmt.Sprintf("writeMessages: failure to generate nonce: %s", err.Error())}
}
var fnonce [24]byte
copy(fnonce[:], nonce)
sealed := secretbox.Seal(nil, dat, &fnonce, &key)
// Encode stored message
payload := boxedLocalMessage{
MsgID: msg.GetMessageID(),
MsgType: msg.GetMessageType(),
V: cryptoVersion,
E: sealed,
N: fnonce,
}
dat, err = encode(payload)
if err != nil {
return NewInternalError(ctx, ms.DebugLabeler, "writeMessages: failed to encode: %s",
err.Error())
}
// Store
if err = ms.G().LocalChatDb.PutRaw(ms.makeMsgKey(convID, uid, msg.GetMessageID()), dat); err != nil {
return NewInternalError(ctx, ms.DebugLabeler, "writeMessages: failed to write msg: %s", err.Error())
}
}
return nil
}
func (ms *msgEngine) ReadMessages(ctx context.Context, rc ResultCollector,
convID chat1.ConversationID, uid gregor1.UID, maxID chat1.MessageID) (err Error) {
// Run all errors through resultCollector
defer func() {
if err != nil {
err = rc.Error(err)
}
}()
// Read all msgs in reverse order
for msgID := maxID; !rc.Done() && msgID > 0; msgID-- {
raw, found, err := ms.G().LocalChatDb.GetRaw(ms.makeMsgKey(convID, uid, msgID))
if err != nil {
return NewInternalError(ctx, ms.DebugLabeler, "readMessages: failed to read msg: %s", err.Error())
}
if !found {
return MissError{}
}
// Decode and check to see if this is a cache hit
var bmsg boxedLocalMessage
if err = decode(raw, &bmsg); err != nil {
return NewInternalError(ctx, ms.DebugLabeler, "readMessages: failed to decode msg: %s", err.Error())
}
if bmsg.GetMessageID() == 0 {
return MissError{}
}
if bmsg.V > cryptoVersion {
return NewInternalError(ctx, ms.DebugLabeler, "readMessages: bad crypto version: %d current: %d id: %d", bmsg.V, cryptoVersion, bmsg.GetMessageID())
}
// Decrypt
fkey, cerr := ms.fetchSecretKey(ctx)
if cerr != nil {
return cerr
}
pt, ok := secretbox.Open(nil, bmsg.E, &bmsg.N, &fkey)
if !ok {
return NewInternalError(ctx, ms.DebugLabeler, "readMessages: failed to decrypt msg: %d err: %s", bmsg.GetMessageID(), err.Error())
}
// Decode payload
var msg chat1.MessageUnboxed
if err = decode(pt, &msg); err != nil {
return NewInternalError(ctx, ms.DebugLabeler, "readMessages: failed to decode: %s", err.Error())
}
rc.Push(msg)
}
return nil
}
func (ms *msgEngine) Init(ctx context.Context, key [32]byte, convID chat1.ConversationID,
uid gregor1.UID) (context.Context, Error) {
return context.WithValue(ctx, beskkey, key), nil
}