cwtch/peer/listen/peer_listen_channel.go

87 lines
2.8 KiB
Go

package listen
import (
"cwtch.im/cwtch/protocol"
"errors"
"git.openprivacy.ca/openprivacy/libricochet-go/channels"
"git.openprivacy.ca/openprivacy/libricochet-go/utils"
"git.openprivacy.ca/openprivacy/libricochet-go/wire/control"
"github.com/golang/protobuf/proto"
)
// CwtchPeerListenChannel is the peer implementation of im.cwtch.server.listen
type CwtchPeerListenChannel struct {
channel *channels.Channel
Handler CwtchPeerSendChannelHandler
}
// CwtchPeerSendChannelHandler is implemented by peers who want to listen to new messages
type CwtchPeerSendChannelHandler interface {
HandleGroupMessage(*protocol.GroupMessage)
}
// Type returns the type string for this channel, e.g. "im.ricochet.server.listen".
func (cplc *CwtchPeerListenChannel) Type() string {
return "im.cwtch.server.listen"
}
// Closed is called when the channel is closed for any reason.
func (cplc *CwtchPeerListenChannel) Closed(err error) {
}
// OnlyClientCanOpen - for Cwtch server channels can only be opened by peers
func (cplc *CwtchPeerListenChannel) OnlyClientCanOpen() bool {
return true
}
// Singleton - for Cwtch channels there can only be one instance per direction
func (cplc *CwtchPeerListenChannel) Singleton() bool {
return true
}
// Bidirectional - for Cwtch channels are not bidrectional
func (cplc *CwtchPeerListenChannel) Bidirectional() bool {
return false
}
// RequiresAuthentication - Cwtch channels require no auth channels
func (cplc *CwtchPeerListenChannel) RequiresAuthentication() string {
return "none"
}
// OpenInbound - peers should never respond to open inbound requests from servers
func (cplc *CwtchPeerListenChannel) OpenInbound(channel *channels.Channel, raw *Protocol_Data_Control.OpenChannel) ([]byte, error) {
return nil, errors.New("client does not receive inbound listen channels")
}
// OpenOutbound sets up a new server listen channel
func (cplc *CwtchPeerListenChannel) OpenOutbound(channel *channels.Channel) ([]byte, error) {
cplc.channel = channel
messageBuilder := new(utils.MessageBuilder)
return messageBuilder.OpenChannel(channel.ID, cplc.Type()), nil
}
// OpenOutboundResult confirms a previous open channel request
func (cplc *CwtchPeerListenChannel) OpenOutboundResult(err error, crm *Protocol_Data_Control.ChannelResult) {
if err == nil {
if crm.GetOpened() {
cplc.channel.Pending = false
}
}
}
// Packet is called for each server packet received on this channel.
func (cplc *CwtchPeerListenChannel) Packet(data []byte) {
csp := &protocol.CwtchServerPacket{}
err := proto.Unmarshal(data, csp)
if err == nil {
if csp.GetGroupMessage() != nil {
gm := csp.GetGroupMessage()
// We create a new go routine here to avoid leaking any information about processing time
// TODO Server can probably try to use this to DoS a peer
go cplc.Handler.HandleGroupMessage(gm)
}
}
}