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contact_request_manager.go
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contact_request_manager.go
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package bertyprotocol
import (
"bytes"
"context"
"encoding/base64"
"fmt"
"strings"
"sync"
ggio "github.com/gogo/protobuf/io"
ipfscid "github.com/ipfs/go-cid"
"github.com/libp2p/go-libp2p-core/crypto"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/pkg/errors"
"go.uber.org/zap"
"moul.io/u"
"berty.tech/berty/v2/go/internal/handshake"
"berty.tech/berty/v2/go/internal/ipfsutil"
"berty.tech/berty/v2/go/internal/logutil"
"berty.tech/berty/v2/go/pkg/errcode"
"berty.tech/berty/v2/go/pkg/protocoltypes"
"berty.tech/berty/v2/go/pkg/tyber"
)
type pendingRequestDetails struct {
contact *protocoltypes.ShareableContact
ownMetadata []byte
}
type pendingRequest struct {
updateCh chan *pendingRequestDetails
cancelFunc context.CancelFunc
}
type contactRequestsManager struct {
enabled bool
seed []byte
announceCancel context.CancelFunc
metadataStore *MetadataStore
lock sync.Mutex
ipfs ipfsutil.ExtendedCoreAPI
accSK crypto.PrivKey
ctx context.Context
logger *zap.Logger
swiper *Swiper
toAdd map[string]*pendingRequest
}
func (c *contactRequestsManager) metadataRequestDisabled(_ *protocoltypes.GroupMetadataEvent) error {
c.enabled = false
if c.announceCancel != nil {
c.announceCancel()
c.ipfs.RemoveStreamHandler(contactRequestV1)
}
c.announceCancel = nil
return nil
}
func (c *contactRequestsManager) metadataRequestEnabled(_ *protocoltypes.GroupMetadataEvent) error {
c.ipfs.SetStreamHandler(contactRequestV1, func(s network.Stream) { _ = c.incomingHandler(s) })
c.enabled = true
if c.announceCancel != nil {
return nil
}
return c.enableIncomingRequests()
}
func (c *contactRequestsManager) metadataRequestReset(evt *protocoltypes.GroupMetadataEvent) error {
e := &protocoltypes.AccountContactRequestReferenceReset{}
if err := e.Unmarshal(evt.Event); err != nil {
return errcode.ErrDeserialization.Wrap(err)
}
c.seed = e.PublicRendezvousSeed
if !c.enabled {
return nil
}
return c.enableIncomingRequests()
}
func cidBytesString(bytes []byte) string {
cid, err := ipfscid.Cast(bytes)
if err != nil {
return "error"
}
return cid.String()
}
func (c *contactRequestsManager) metadataRequestEnqueued(evt *protocoltypes.GroupMetadataEvent) error {
ctx := tyber.ContextWithConstantTraceID(c.ctx, "msgrcvd-"+cidBytesString(evt.EventContext.ID))
traceName := fmt.Sprintf("Received %s on group %s", strings.TrimPrefix(evt.Metadata.EventType.String(), "EventType"), base64.RawURLEncoding.EncodeToString(evt.EventContext.GroupPK))
c.logger.Debug(traceName, tyber.FormatStepLogFields(ctx, []tyber.Detail{}, tyber.UpdateTraceName(traceName))...)
e := &protocoltypes.AccountContactRequestEnqueued{}
if err := e.Unmarshal(evt.Event); err != nil {
return tyber.LogError(ctx, c.logger, "Failed to unmarshal event", err)
}
if err := c.enqueueRequest(context.TODO(), &protocoltypes.ShareableContact{
PK: e.Contact.PK,
PublicRendezvousSeed: e.Contact.PublicRendezvousSeed,
}, e.OwnMetadata); err != nil {
return tyber.LogError(ctx, c.logger, "Failed to enqueue request", err)
}
return nil
}
func (c *contactRequestsManager) metadataRequestSent(evt *protocoltypes.GroupMetadataEvent) error {
e := &protocoltypes.AccountContactRequestSent{}
if err := e.Unmarshal(evt.Event); err != nil {
return err
}
if request, ok := c.toAdd[string(e.ContactPK)]; ok {
request.cancelFunc()
delete(c.toAdd, string(e.ContactPK))
}
return nil
}
func (c *contactRequestsManager) metadataRequestReceived(evt *protocoltypes.GroupMetadataEvent) error {
e := &protocoltypes.AccountContactRequestReceived{}
if err := e.Unmarshal(evt.Event); err != nil {
return err
}
if request, ok := c.toAdd[string(e.ContactPK)]; ok {
request.cancelFunc()
delete(c.toAdd, string(e.ContactPK))
}
return nil
}
func (c *contactRequestsManager) enqueueRequest(tctx context.Context, contact *protocoltypes.ShareableContact, ownMetadata []byte) error {
tctx, _, endSection := tyber.Section(tctx, c.logger, "Requesting contact "+base64.RawURLEncoding.EncodeToString(contact.PK))
pk, err := crypto.UnmarshalEd25519PublicKey(contact.PK)
if err != nil {
endSection(err, "Failed to unmarshal contact public key")
return err
}
// contact already queued
if pending, ok := c.toAdd[string(contact.PK)]; ok {
pending.updateCh <- &pendingRequestDetails{
contact: contact,
ownMetadata: ownMetadata,
}
endSection(nil, "Contact already queued")
return nil
}
swiperCh := make(chan peer.AddrInfo)
reqCtx, reqCancel := context.WithCancel(c.ctx)
parent := u.NewUniqueChild(context.Background())
var wg sync.WaitGroup
pending := &pendingRequest{
updateCh: make(chan *pendingRequestDetails),
cancelFunc: reqCancel,
}
go func() {
for {
select {
case details := <-pending.updateCh:
wg.Add(1)
parent.SetChild(func(ctx context.Context) {
c.swiper.WatchTopic(
ctx,
details.contact.PK,
details.contact.PublicRendezvousSeed,
swiperCh,
wg.Done,
)
})
case <-reqCtx.Done():
parent.CloseChild()
// drain channel
go func() {
for range swiperCh {
}
}()
wg.Wait()
close(swiperCh)
return
}
}
}()
pending.updateCh <- &pendingRequestDetails{
contact: contact,
ownMetadata: ownMetadata,
}
c.toAdd[string(contact.PK)] = pending
// process addresses from swiper
go func() {
for addr := range swiperCh {
if err := c.ipfs.Swarm().Connect(c.ctx, addr); err != nil {
endSection(err, "Failed to connect to peer")
return
}
stream, err := c.ipfs.NewStream(context.TODO(), addr.ID, contactRequestV1)
if err != nil {
endSection(err, "Failed to open stream with peer")
return
}
if err := c.performSend(tctx, pk, stream); err != nil {
endSection(err, "Contact request send failed")
return
}
endSection(nil, "Contact request success")
}
}()
return nil
}
func (c *contactRequestsManager) metadataWatcher(ctx context.Context) {
handlers := map[protocoltypes.EventType]func(*protocoltypes.GroupMetadataEvent) error{
protocoltypes.EventTypeAccountContactRequestDisabled: c.metadataRequestDisabled,
protocoltypes.EventTypeAccountContactRequestEnabled: c.metadataRequestEnabled,
protocoltypes.EventTypeAccountContactRequestReferenceReset: c.metadataRequestReset,
protocoltypes.EventTypeAccountContactRequestOutgoingEnqueued: c.metadataRequestEnqueued,
protocoltypes.EventTypeAccountContactRequestOutgoingSent: c.metadataRequestSent,
protocoltypes.EventTypeAccountContactRequestIncomingReceived: c.metadataRequestReceived,
}
c.lock.Lock()
enabled, contact := c.metadataStore.GetIncomingContactRequestsStatus()
c.enabled = enabled
if contact != nil {
c.seed = contact.PublicRendezvousSeed
}
if c.enabled && len(c.seed) > 0 {
if err := c.metadataRequestEnabled(&protocoltypes.GroupMetadataEvent{}); err != nil {
c.logger.Warn("unable to enable metadata request", zap.Error(err))
}
}
for _, contact := range c.metadataStore.ListContactsByStatus(protocoltypes.ContactStateToRequest) {
ownMeta, err := c.metadataStore.GetRequestOwnMetadataForContact(contact.PK)
if err != nil {
c.logger.Warn("error while retrieving own metadata for contact", logutil.PrivateBinary("pk", contact.PK), zap.Error(err))
}
if err := c.enqueueRequest(context.TODO(), contact, ownMeta); err != nil {
c.logger.Error("unable to enqueue contact request", zap.Error(err))
}
}
c.lock.Unlock()
chSub := c.metadataStore.Subscribe(ctx)
go func() {
for evt := range chSub {
e, ok := evt.(*protocoltypes.GroupMetadataEvent)
if !ok {
continue
}
if _, ok := handlers[e.Metadata.EventType]; !ok {
continue
}
c.logger.Debug("METADATA WATCHER", zap.String("event", e.Metadata.EventType.String()))
c.lock.Lock()
if err := handlers[e.Metadata.EventType](e); err != nil {
c.lock.Unlock()
c.logger.Error("error while handling metadata store event", zap.Error(err))
continue
}
c.lock.Unlock()
}
}()
}
const contactRequestV1 = "/berty/contact_req/1.0.0"
func (c *contactRequestsManager) incomingHandler(stream network.Stream) (err error) {
ctx, _, endSection := tyber.Section(c.ctx, c.logger, "Responding to contact request")
defer func() { endSection(err, "", tyber.ForceReopen) }()
defer func() {
if closeErr := ipfsutil.FullClose(stream); closeErr != nil {
endSection(closeErr, "Failed to close stream with other peer", tyber.ForceReopen)
}
}()
reader := ggio.NewDelimitedReader(stream, 2048)
writer := ggio.NewDelimitedWriter(stream)
otherPK, err := handshake.ResponseUsingReaderWriter(ctx, c.logger, reader, writer, c.accSK)
if err != nil {
return errors.Wrap(err, "handshake failed")
}
otherPKBytes, err := otherPK.Raw()
if err != nil {
return errors.Wrap(err, "failed to marshal contact public key")
}
contact := &protocoltypes.ShareableContact{}
if err := reader.ReadMsg(contact); err != nil {
return errors.Wrap(err, "failed to retrieve contact information")
}
if err := contact.CheckFormat(protocoltypes.ShareableContactOptionsAllowMissingRDVSeed); err != nil {
return errors.Wrap(err, "invalid contact information format")
}
if !bytes.Equal(otherPKBytes, contact.PK) {
return errors.Wrap(err, "contact information does not match handshake data")
}
if _, err = c.metadataStore.ContactRequestIncomingReceived(ctx, &protocoltypes.ShareableContact{
PK: otherPKBytes,
PublicRendezvousSeed: contact.PublicRendezvousSeed,
Metadata: contact.Metadata,
}); err != nil {
return errors.Wrap(err, "failed to add ContactRequestIncomingReceived event to metadata store")
}
return nil
}
func (c *contactRequestsManager) performSend(ctx context.Context, otherPK crypto.PubKey, stream network.Stream) error {
defer func() {
if err := ipfsutil.FullClose(stream); err != nil {
c.logger.Warn("error while closing stream with other peer", zap.Error(err))
}
}()
c.lock.Lock()
if c.metadataStore.checkContactStatus(otherPK, protocoltypes.ContactStateAdded) {
// Nothing to do, contact has already been requested
c.lock.Unlock()
return nil
}
c.lock.Unlock()
_, contact := c.metadataStore.GetIncomingContactRequestsStatus()
if contact == nil {
return fmt.Errorf("unable to retrieve own contact information")
}
pkB, err := otherPK.Raw()
if err != nil {
return fmt.Errorf("unable to get raw pk: %w", err)
}
ownMetadata, err := c.metadataStore.GetRequestOwnMetadataForContact(pkB)
if err != nil {
c.logger.Warn("unable to get own metadata for contact", zap.Error(err))
ownMetadata = nil
}
contact.Metadata = ownMetadata
reader := ggio.NewDelimitedReader(stream, 2048)
writer := ggio.NewDelimitedWriter(stream)
if err := handshake.RequestUsingReaderWriter(ctx, c.logger, reader, writer, c.accSK, otherPK); err != nil {
return fmt.Errorf("an error occurred during handshake: %w", err)
}
if err := writer.WriteMsg(contact); err != nil {
return fmt.Errorf("an error occurred while sending own contact information: %w", err)
}
if _, err := c.metadataStore.ContactRequestOutgoingSent(ctx, otherPK); err != nil {
return fmt.Errorf("an error occurred while marking contact request as sent: %w", err)
}
return nil
}
func (c *contactRequestsManager) enableIncomingRequests() error {
c.logger.Debug("enableIncomingRequests start")
if c.announceCancel != nil {
c.announceCancel()
}
c.logger.Debug("enableIncomingRequests get public")
pkBytes, err := c.accSK.GetPublic().Raw()
if err != nil {
return err
}
var ctx context.Context
ctx, c.announceCancel = context.WithCancel(c.ctx)
c.logger.Debug("enableIncomingRequests run announce")
c.swiper.Announce(ctx, pkBytes, c.seed)
c.logger.Debug("enableIncomingRequests end")
return nil
}
func initContactRequestsManager(ctx context.Context, s *Swiper, store *MetadataStore, ipfs ipfsutil.ExtendedCoreAPI, logger *zap.Logger) error {
sk, err := store.devKS.AccountPrivKey()
if err != nil {
return err
}
cm := &contactRequestsManager{
metadataStore: store,
ipfs: ipfs,
logger: logger,
accSK: sk,
ctx: ctx,
swiper: s,
toAdd: map[string]*pendingRequest{},
}
go cm.metadataWatcher(ctx)
return nil
}