core: Implement inbound contact requests

This does not yet include persistence of inbound requests in the config,
and it's mostly untested, but it's more or less complete.

core/contact.go

@@ -133,6 +133,12 @@ func (c *Contact) Data() *ricochet.Contact {
 	return data
 }
 
+func (c *Contact) IsRequest() bool {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+	return c.data.Request.Pending
+}
+
 func (c *Contact) Conversation() *Conversation {
 	c.mutex.Lock()
 	defer c.mutex.Unlock()
@@ -312,6 +318,7 @@ func (c *Contact) connectOutbound(ctx context.Context, connChannel chan *protoco
 			// is fragile and dumb.
 			// XXX BUG: This means no backoff for authentication failure
 			handler := &ProtocolConnection{
+				Core:       c.core,
 				Conn:       oc,
 				Contact:    c,
 				MyHostname: c.core.Identity.Address()[9:],

core/contactlist.go

@@ -17,6 +17,7 @@ type ContactList struct {
 	events *utils.Publisher
 
 	contacts        map[int]*Contact
+	inboundRequests map[string]*InboundContactRequest
 }
 
 func LoadContactList(core *Ricochet) (*ContactList, error) {
@@ -80,30 +81,43 @@ func (this *ContactList) ContactByAddress(address string) *Contact {
 	return nil
 }
 
-func (this *ContactList) AddContactRequest(address, name, fromName, text string) (*Contact, error) {
+func (cl *ContactList) InboundRequestByAddress(address string) *InboundContactRequest {
-	if !IsAddressValid(address) {
+	cl.mutex.RLock()
-		return nil, errors.New("Invalid ricochet address")
+	defer cl.mutex.RUnlock()
+	for _, request := range cl.inboundRequests {
+		if request.Address == address {
+			return request
 		}
-	if len(fromName) > 0 && !IsNicknameAcceptable(fromName) {
-		return nil, errors.New("Invalid nickname")
 	}
-	if len(text) > 0 && !IsMessageAcceptable(text) {
+	return nil
-		return nil, errors.New("Invalid message")
 }
 
+// AddNewContact adds a new contact to the persistent contact list, broadcasts a
+// contact add RPC event, and returns a newly constructed Contact. AddNewContact
+// does not create contact requests or trigger any other protocol behavior.
+//
+// Generally, you will use AddContactRequest (for outbound requests) and
+// AddOrUpdateInboundContactRequest plus InboundContactRequest.Accept() instead of
+// using this function directly.
+func (this *ContactList) AddNewContact(configContact ConfigContact) (*Contact, error) {
 	this.mutex.Lock()
 	defer this.mutex.Unlock()
 
+	address, ok := AddressFromOnion(configContact.Hostname)
+	if !ok {
+		return nil, errors.New("Invalid ricochet address")
+	}
+
 	for _, contact := range this.contacts {
 		if contact.Address() == address {
 			return nil, errors.New("Contact already exists with this address")
 		}
-		if contact.Nickname() == name {
+		if contact.Nickname() == configContact.Nickname {
 			return nil, errors.New("Contact already exists with this nickname")
 		}
 	}
 
-	// XXX check inbound requests
+	// XXX check inbound requests (but this can be called for an inbound req too)
 
 	// Write new contact into config
 	config := this.core.Config.OpenWrite()
@@ -118,18 +132,6 @@ func (this *ContactList) AddContactRequest(address, name, fromName, text string)
 	}
 
 	contactId := maxContactId + 1
-	onion, _ := OnionFromAddress(address)
-	configContact := ConfigContact{
-		Hostname:    onion,
-		Nickname:    name,
-		WhenCreated: time.Now().Format(time.RFC3339),
-		Request: ConfigContactRequest{
-			Pending:    true,
-			MyNickname: fromName,
-			Message:    text,
-		},
-	}
-
 	config.Contacts[strconv.Itoa(contactId)] = configContact
 	if err := config.Save(); err != nil {
 		return nil, err
@@ -150,10 +152,54 @@ func (this *ContactList) AddContactRequest(address, name, fromName, text string)
 	}
 	this.events.Publish(event)
 
+	// XXX Should this be here? Is it ok for inbound where we might pass conn over momentarily?
 	contact.StartConnection()
 	return contact, nil
 }
 
+// AddContactRequest creates a new outbound contact request with the given parameters,
+// adds it to the contact list, and returns the newly constructed Contact.
+//
+// If an inbound request already exists for this address, that request will be automatically
+// accepted, and the returned contact will already be fully established.
+func (cl *ContactList) AddContactRequest(address, name, fromName, text string) (*Contact, error) {
+	onion, valid := OnionFromAddress(address)
+	if !valid {
+		return nil, errors.New("Invalid ricochet address")
+	}
+	if !IsNicknameAcceptable(name) {
+		return nil, errors.New("Invalid nickname")
+	}
+	if len(fromName) > 0 && !IsNicknameAcceptable(fromName) {
+		return nil, errors.New("Invalid 'from' nickname")
+	}
+	if len(text) > 0 && !IsMessageAcceptable(text) {
+		return nil, errors.New("Invalid message")
+	}
+
+	configContact := ConfigContact{
+		Hostname:    onion,
+		Nickname:    name,
+		WhenCreated: time.Now().Format(time.RFC3339),
+		Request: ConfigContactRequest{
+			Pending:    true,
+			MyNickname: fromName,
+			Message:    text,
+		},
+	}
+	contact, err := cl.AddNewContact(configContact)
+	if err != nil {
+		return nil, err
+	}
+
+	if inboundRequest := cl.InboundRequestByAddress(address); inboundRequest != nil {
+		contact.UpdateContactRequest("Accepted")
+		inboundRequest.AcceptWithContact(contact)
+	}
+
+	return contact, nil
+}
+
 func (this *ContactList) RemoveContact(contact *Contact) error {
 	this.mutex.Lock()
 	defer this.mutex.Unlock()
@@ -186,6 +232,99 @@ func (this *ContactList) RemoveContact(contact *Contact) error {
 	return nil
 }
 
+// AddOrUpdateInboundContactRequest creates or modifies an inbound contact request for
+// the hostname, with an optional nickname suggestion and introduction message
+//
+// The nickname, message, and address must be validated before calling this function.
+//
+// This function may change the state of the request, and the caller is responsible for
+// sending a reply message and closing the channel or connection as appropriate. If the
+// request is still active when the state changes spontaneously later (e.g. it's accepted
+// by the user), replies will be sent by InboundContactRequest.
+//
+// This function may return either an InboundContactRequest (which may be pending or already
+// rejected), an existing contact (which should be treated as accepting the request), or
+// neither, which is considered a rejection.
+func (cl *ContactList) AddOrUpdateInboundContactRequest(address, nickname, message string) (*InboundContactRequest, *Contact) {
+	cl.mutex.Lock()
+	defer cl.mutex.Unlock()
+
+	// Look up existing request
+	if request := cl.inboundRequests[address]; request != nil {
+		// Errors in Update will change the state of the request, which the caller sends as a reply
+		request.Update(nickname, message)
+		return request, nil
+	}
+
+	// Check for existing contacts or outbound contact requests
+	for _, contact := range cl.contacts {
+		if contact.Address() == address {
+			if contact.IsRequest() {
+				contact.UpdateContactRequest("Accepted")
+			}
+			return nil, contact
+		}
+	}
+
+	// Create new request
+	request := CreateInboundContactRequest(cl.core, address, nickname, message)
+	request.StatusChanged = cl.inboundRequestChanged
+	cl.inboundRequests[address] = request
+	// XXX update config
+	requestData := request.Data()
+	event := ricochet.ContactEvent{
+		Type: ricochet.ContactEvent_ADD,
+		Subject: &ricochet.ContactEvent_Request{
+			Request: &requestData,
+		},
+	}
+	cl.events.Publish(event)
+	return request, nil
+}
+
+// RemoveInboundContactRequest removes the record of an inbound contact request,
+// without taking any other actions. Generally you will want to act on a request with
+// Accept() or Reject(), rather than call this function directly, but it is valid to
+// call on any inbound request regardless.
+func (cl *ContactList) RemoveInboundContactRequest(request *InboundContactRequest) error {
+	cl.mutex.Lock()
+	defer cl.mutex.Unlock()
+	requestData := request.Data()
+
+	if cl.inboundRequests[requestData.Address] != request {
+		return errors.New("Request is not in contact list")
+	}
+
+	request.CloseConnection()
+	// XXX Remove from config
+
+	delete(cl.inboundRequests, requestData.Address)
+
+	event := ricochet.ContactEvent{
+		Type: ricochet.ContactEvent_DELETE,
+		Subject: &ricochet.ContactEvent_Request{
+			Request: &requestData,
+		},
+	}
+	cl.events.Publish(event)
+	return nil
+}
+
+// inboundRequestChanged is called by the StatusChanged callback of InboundContactRequest
+// after the request has been modified, such as through Update() or Reject(). Accepted
+// requests do not pass through this function, because they're immediately removed.
+func (cl *ContactList) inboundRequestChanged(request *InboundContactRequest) {
+	// XXX update config
+	requestData := request.Data()
+	event := ricochet.ContactEvent{
+		Type: ricochet.ContactEvent_UPDATE,
+		Subject: &ricochet.ContactEvent_Request{
+			Request: &requestData,
+		},
+	}
+	cl.events.Publish(event)
+}
+
 func (this *ContactList) StartConnections() {
 	for _, contact := range this.Contacts() {
 		contact.StartConnection()

core/identity.go

@@ -114,6 +114,7 @@ func (is *identityService) OnNewConnection(oc *protocol.OpenConnection) {
 	// XXX Should have pre-auth handling, timeouts
 	identity := is.Identity
 	handler := &ProtocolConnection{
+		Core: identity.core,
 		Conn: oc,
 		GetContactByHostname: func(hostname string) *Contact {
 			address, ok := AddressFromPlainHost(hostname)

core/inboundcontactrequest.go

@@ -0,0 +1,167 @@
+package core
+
+import (
+	"errors"
+	"github.com/ricochet-im/ricochet-go/rpc"
+	protocol "github.com/s-rah/go-ricochet"
+	"log"
+	"sync"
+	"time"
+)
+
+type InboundContactRequest struct {
+	core      *Ricochet
+	mutex     sync.Mutex
+	data      ricochet.ContactRequest
+	conn      *protocol.OpenConnection
+	channelID int32
+	Address   string
+
+	// Called when the request state is changed
+	StatusChanged func(request *InboundContactRequest)
+}
+
+// CreateInboundContactRequest constructs a new InboundContactRequest, usually from a newly
+// received request on an open connection. Requests are managed through the ContactList, so
+// generally you should use ContactList.AddOrUpdateInboundContactRequest instead of calling
+// this function directly.
+func CreateInboundContactRequest(core *Ricochet, address, nickname, message string) *InboundContactRequest {
+	cr := &InboundContactRequest{
+		core: core,
+		data: ricochet.ContactRequest{
+			Direction:    ricochet.ContactRequest_INBOUND,
+			Address:      address,
+			Text:         message,
+			FromNickname: nickname,
+			WhenCreated:  time.Now().Format(time.RFC3339),
+		},
+		Address: address,
+	}
+
+	return cr
+}
+
+// XXX There should be stricter management & a timeout for this connection
+func (cr *InboundContactRequest) SetConnection(conn *protocol.OpenConnection, channelID int32) {
+	cr.mutex.Lock()
+	defer cr.mutex.Unlock()
+
+	if cr.conn != nil && cr.conn != conn {
+		log.Printf("Replacing connection on an inbound contact request")
+		cr.conn.Close()
+	}
+	cr.conn = conn
+	cr.channelID = channelID
+}
+
+func (cr *InboundContactRequest) CloseConnection() {
+	if cr.conn != nil {
+		cr.conn.Close()
+		cr.conn = nil
+	}
+}
+
+func (cr *InboundContactRequest) Update(nickname, message string) {
+	cr.mutex.Lock()
+	defer cr.mutex.Unlock()
+
+	if cr.data.Rejected {
+		return
+	}
+
+	// These should already be validated, but just in case..
+	if len(nickname) == 0 || IsNicknameAcceptable(nickname) {
+		cr.data.FromNickname = nickname
+	}
+	if len(message) == 0 || IsMessageAcceptable(message) {
+		cr.data.Text = message
+	}
+
+	if cr.StatusChanged != nil {
+		cr.StatusChanged(cr)
+	}
+}
+
+func (cr *InboundContactRequest) Accept() (*Contact, error) {
+	cr.mutex.Lock()
+	defer cr.mutex.Unlock()
+
+	if cr.data.Rejected {
+		log.Printf("Accept called on an inbound contact request that was already rejected; request is %v", cr)
+		return nil, errors.New("Contact request has already been rejected")
+	}
+
+	log.Printf("Accepting contact request from %s", cr.data.Address)
+
+	onion, _ := OnionFromAddress(cr.data.Address)
+	configContact := ConfigContact{
+		Hostname:    onion,
+		Nickname:    cr.data.FromNickname,
+		WhenCreated: cr.data.WhenCreated,
+	}
+	contact, err := cr.core.Identity.ContactList().AddNewContact(configContact)
+	if err != nil {
+		log.Printf("Error occurred in accepting contact request: %s", err)
+		return nil, err
+	}
+
+	if err := cr.AcceptWithContact(contact); err != nil {
+		return contact, err
+	}
+	return contact, nil
+}
+
+func (cr *InboundContactRequest) AcceptWithContact(contact *Contact) error {
+	if contact.Address() != cr.data.Address {
+		return errors.New("Contact address does not match request in accept")
+	}
+
+	cr.core.Identity.ContactList().RemoveInboundContactRequest(cr)
+
+	// Pass the open connection to the new contact
+	if cr.conn != nil && !cr.conn.Closed {
+		cr.conn.AckContactRequest(cr.channelID, "Accepted")
+		cr.conn.CloseChannel(cr.channelID)
+		contact.OnConnectionAuthenticated(cr.conn, true)
+		cr.conn = nil
+	}
+
+	return nil
+}
+
+func (cr *InboundContactRequest) Reject() {
+	cr.mutex.Lock()
+	defer cr.mutex.Unlock()
+
+	if cr.data.Rejected {
+		return
+	}
+
+	log.Printf("Rejecting contact request from %s", cr.data.Address)
+	cr.data.Rejected = true
+
+	// Signal update to the callback (probably from ContactList)
+	if cr.StatusChanged != nil {
+		cr.StatusChanged(cr)
+	}
+
+	if cr.conn != nil && !cr.conn.Closed {
+		cr.conn.AckContactRequest(cr.channelID, "Rejected")
+		cr.conn.CloseChannel(cr.channelID)
+		cr.conn.Close()
+		cr.conn = nil
+
+		// The request can be removed once a protocol response is sent
+		cr.core.Identity.ContactList().RemoveInboundContactRequest(cr)
+	}
+}
+
+func (cr *InboundContactRequest) Data() ricochet.ContactRequest {
+	return cr.data
+}
+
+func (cr *InboundContactRequest) IsRejected() bool {
+	cr.mutex.Lock()
+	defer cr.mutex.Unlock()
+	return cr.data.Rejected
+}

core/protocol.go

@@ -9,6 +9,8 @@ import (
 )
 
 type ProtocolConnection struct {
+	Core *Ricochet
+
 	Conn    *protocol.OpenConnection
 	Contact *Contact
 
@@ -95,6 +97,46 @@ func (pc *ProtocolConnection) OnAuthenticationResult(channelID int32, result boo
 
 // Contact Management
 func (pc *ProtocolConnection) OnContactRequest(channelID int32, nick string, message string) {
+	if pc.Conn.Client || !pc.Conn.IsAuthed || pc.Contact != nil {
+		pc.Conn.CloseChannel(channelID)
+		return
+	}
+
+	address, ok := AddressFromPlainHost(pc.Conn.OtherHostname)
+	if !ok {
+		pc.Conn.CloseChannel(channelID)
+		return
+	}
+	if len(nick) > 0 && !IsNicknameAcceptable(nick) {
+		log.Printf("protocol: Stripping unacceptable nickname from inbound request; encoded: %x", []byte(nick))
+		nick = ""
+	}
+	if len(message) > 0 && !IsMessageAcceptable(message) {
+		log.Printf("protocol: Stripping unacceptable message from inbound request; len: %d, encoded: %x", len(message), []byte(message))
+		message = ""
+	}
+
+	contactList := pc.Core.Identity.ContactList()
+	request, contact := contactList.AddOrUpdateInboundContactRequest(address, nick, message)
+
+	if contact != nil {
+		// Accepted immediately
+		pc.Conn.AckContactRequestOnResponse(channelID, "Accepted")
+		pc.Conn.CloseChannel(channelID)
+		contact.OnConnectionAuthenticated(pc.Conn, true)
+	} else if request != nil && !request.IsRejected() {
+		// Pending
+		pc.Conn.AckContactRequestOnResponse(channelID, "Pending")
+		request.SetConnection(pc.Conn, channelID)
+	} else {
+		// Rejected
+		pc.Conn.AckContactRequestOnResponse(channelID, "Rejected")
+		pc.Conn.CloseChannel(channelID)
+		pc.Conn.Close()
+		if request != nil {
+			contactList.RemoveInboundContactRequest(request)
+		}
+	}
 }
 
 func (pc *ProtocolConnection) OnContactRequestAck(channelID int32, status string) {

core/rpcserver.go

@@ -151,11 +151,32 @@ func (s *RpcServer) DeleteContact(ctx context.Context, req *ricochet.DeleteConta
 }
 
 func (s *RpcServer) AcceptInboundRequest(ctx context.Context, req *ricochet.ContactRequest) (*ricochet.Contact, error) {
-	return nil, NotImplementedError
+	if req.Direction != ricochet.ContactRequest_INBOUND {
+		return nil, errors.New("Request must be inbound")
+	}
+	contactList := s.Core.Identity.ContactList()
+	request := contactList.InboundRequestByAddress(req.Address)
+	if request == nil {
+		return nil, errors.New("Request does not exist")
+	}
+	contact, err := request.Accept()
+	if err != nil {
+		return nil, err
+	}
+	return contact.Data(), nil
 }
 
 func (s *RpcServer) RejectInboundRequest(ctx context.Context, req *ricochet.ContactRequest) (*ricochet.RejectInboundRequestReply, error) {
-	return nil, NotImplementedError
+	if req.Direction != ricochet.ContactRequest_INBOUND {
+		return nil, errors.New("Request must be inbound")
+	}
+	contactList := s.Core.Identity.ContactList()
+	request := contactList.InboundRequestByAddress(req.Address)
+	if request == nil {
+		return nil, errors.New("Request does not exist")
+	}
+	request.Reject()
+	return &ricochet.RejectInboundRequestReply{}, nil
 }
 
 func (s *RpcServer) MonitorConversations(req *ricochet.MonitorConversationsRequest, stream ricochet.RicochetCore_MonitorConversationsServer) error {

rpc/contact.pb.go

@@ -207,6 +207,8 @@ type ContactRequest struct {
 	Nickname     string                   `protobuf:"bytes,3,opt,name=nickname" json:"nickname,omitempty"`
 	Text         string                   `protobuf:"bytes,4,opt,name=text" json:"text,omitempty"`
 	FromNickname string                   `protobuf:"bytes,5,opt,name=fromNickname" json:"fromNickname,omitempty"`
+	WhenCreated  string                   `protobuf:"bytes,6,opt,name=whenCreated" json:"whenCreated,omitempty"`
+	Rejected     bool                     `protobuf:"varint,7,opt,name=rejected" json:"rejected,omitempty"`
 }
 
 func (m *ContactRequest) Reset()                    { *m = ContactRequest{} }
@@ -249,6 +251,20 @@ func (m *ContactRequest) GetFromNickname() string {
 	return ""
 }
 
+func (m *ContactRequest) GetWhenCreated() string {
+	if m != nil {
+		return m.WhenCreated
+	}
+	return ""
+}
+
+func (m *ContactRequest) GetRejected() bool {
+	if m != nil {
+		return m.Rejected
+	}
+	return false
+}
+
 type MonitorContactsRequest struct {
 }
 
@@ -451,38 +467,39 @@ func init() {
 func init() { proto.RegisterFile("contact.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 520 bytes of a gzipped FileDescriptorProto
+	// 539 bytes of a gzipped FileDescriptorProto
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+	0x17, 0xd1, 0x89, 0xbe, 0xdb, 0x34, 0xd0, 0x31, 0x1a, 0x21, 0x6e, 0x61, 0x7c, 0x26, 0xb0, 0x4e,
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+	0x19, 0x98, 0x2c, 0x4f, 0x3f, 0xb2, 0xe4, 0x96, 0xda, 0x1d, 0x49, 0x6d, 0x6a, 0xe4, 0x40, 0xef,
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 }

rpc/contact.proto

@@ -32,6 +32,8 @@ message ContactRequest {
     string nickname = 3;
     string text = 4;
     string fromNickname = 5;
+    string whenCreated = 6;
+    bool rejected = 7;
 }
 
 message MonitorContactsRequest {