forked from cwtch.im/cwtch
127 lines
3.6 KiB
Go
127 lines
3.6 KiB
Go
package connections
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import (
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"cwtch.im/cwtch/event"
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"encoding/json"
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"git.openprivacy.ca/cwtch.im/tapir"
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"git.openprivacy.ca/cwtch.im/tapir/applications"
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"git.openprivacy.ca/openprivacy/log"
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"sync"
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)
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const cwtchCapability = tapir.Capability("cwtchCapability")
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// PeerApp encapsulates the behaviour of a Cwtch Peer
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type PeerApp struct {
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applications.AuthApp
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connection tapir.Connection
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MessageHandler func(string, string, string, []byte)
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RetValHandler func(string, []byte, []byte)
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IsBlocked func(string) bool
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IsAllowed func(string) bool
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OnAcknowledgement func(string, string)
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OnAuth func(string)
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OnClose func(string)
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OnConnecting func(string)
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getValRequests sync.Map // [string]string eventID:Data
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}
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// PeerMessage is an encapsulation that can be used by higher level applications
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type PeerMessage struct {
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ID string // A unique Message ID (primarily used for acknowledgments)
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Context string // A unique context identifier i.e. im.cwtch.chat
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Data []byte // The serialized data packet.
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}
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type peerGetVal struct {
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Scope, Path string
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}
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type peerRetVal struct {
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Val string
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Exists bool
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}
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// NewInstance should always return a new instantiation of the application.
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func (pa *PeerApp) NewInstance() tapir.Application {
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newApp := new(PeerApp)
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newApp.MessageHandler = pa.MessageHandler
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newApp.IsBlocked = pa.IsBlocked
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newApp.IsAllowed = pa.IsAllowed
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newApp.OnAcknowledgement = pa.OnAcknowledgement
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newApp.OnAuth = pa.OnAuth
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newApp.OnClose = pa.OnClose
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newApp.OnConnecting = pa.OnConnecting
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newApp.RetValHandler = pa.RetValHandler
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return newApp
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}
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// Init is run when the connection is first started.
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func (pa *PeerApp) Init(connection tapir.Connection) {
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// First run the Authentication App
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pa.AuthApp.Init(connection)
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if connection.HasCapability(applications.AuthCapability) {
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pa.connection = connection
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connection.SetCapability(cwtchCapability)
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if pa.IsBlocked(connection.Hostname()) {
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pa.connection.Close()
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pa.OnClose(connection.Hostname())
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} else {
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pa.OnAuth(connection.Hostname())
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go pa.listen()
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}
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} else {
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// The auth protocol wasn't completed, we can safely shutdown the connection
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connection.Close()
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}
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}
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func (pa *PeerApp) listen() {
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for {
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message := pa.connection.Expect()
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if len(message) == 0 {
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log.Debugf("0 byte read, socket has likely failed. Closing the listen goroutine")
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pa.OnClose(pa.connection.Hostname())
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return
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}
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var peerMessage PeerMessage
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err := json.Unmarshal(message, &peerMessage)
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if err == nil {
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switch peerMessage.Context {
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case event.ContextAck:
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pa.OnAcknowledgement(pa.connection.Hostname(), peerMessage.ID)
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case event.ContextRetVal:
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req, ok := pa.getValRequests.Load(peerMessage.ID)
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if ok {
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reqStr := []byte(req.(string))
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pa.RetValHandler(pa.connection.Hostname(), reqStr, peerMessage.Data)
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pa.getValRequests.Delete(peerMessage.ID)
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}
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default:
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if pa.IsAllowed(pa.connection.Hostname()) {
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pa.MessageHandler(pa.connection.Hostname(), peerMessage.ID, peerMessage.Context, peerMessage.Data)
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// Acknowledge the message
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pa.SendMessage(PeerMessage{peerMessage.ID, event.ContextAck, []byte{}})
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}
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}
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} else {
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log.Errorf("Error unmarshalling PeerMessage package: %x %v", message, err)
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}
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}
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}
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// SendMessage sends the peer a preformatted message
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// NOTE: This is a stub, we will likely want to extend this to better reflect the desired protocol
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func (pa *PeerApp) SendMessage(message PeerMessage) {
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if message.Context == event.ContextGetVal {
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pa.getValRequests.Store(message.ID, string(message.Data))
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}
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serialized, _ := json.Marshal(message)
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pa.connection.Send(serialized)
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}
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