cwtch/peer/cwtch_peer.go

package peer

import (
	"cwtch.im/cwtch/event"
	"cwtch.im/cwtch/model"
	"cwtch.im/cwtch/model/attr"
	"cwtch.im/cwtch/protocol/connections"
	"encoding/base32"
	"encoding/base64"
	"encoding/json"
	"errors"
	"git.openprivacy.ca/openprivacy/log"
	"strconv"
	"strings"
	"sync"
	"time"
)

var autoHandleableEvents = map[event.Type]bool{event.EncryptedGroupMessage: true, event.PeerStateChange: true,
	event.ServerStateChange: true, event.NewGroupInvite: true, event.NewMessageFromPeer: true,
	event.PeerAcknowledgement: true, event.PeerError: true, event.SendMessageToGroupError: true,
	event.NewGetValMessageFromPeer: true, event.NewRetValMessageFromPeer: true, event.ProtocolEngineStopped: true, event.RetryServerRequest: true}

// DefaultEventsToHandle specifies which events will be subscribed to
//  when a peer has its Init() function called
var DefaultEventsToHandle = []event.Type{
	event.EncryptedGroupMessage,
	event.NewMessageFromPeer,
	event.PeerAcknowledgement,
	event.NewGroupInvite,
	event.PeerError,
	event.SendMessageToGroupError,
	event.NewGetValMessageFromPeer,
	event.ProtocolEngineStopped,
	event.RetryServerRequest,
}

// cwtchPeer manages incoming and outgoing connections and all processing for a Cwtch cwtchPeer
type cwtchPeer struct {
	Profile      *model.Profile
	mutex        sync.Mutex
	shutdown     bool
	listenStatus bool

	queue    event.Queue
	eventBus event.Manager
}

// BlockUnknownConnections will auto disconnect from connections if authentication doesn't resolve a hostname
// known to peer.
func (cp *cwtchPeer) BlockUnknownConnections() {
	cp.eventBus.Publish(event.NewEvent(event.BlockUnknownPeers, map[event.Field]string{}))
}

// AllowUnknownConnections will permit connections from unknown contacts.
func (cp *cwtchPeer) AllowUnknownConnections() {
	cp.eventBus.Publish(event.NewEvent(event.AllowUnknownPeers, map[event.Field]string{}))
}

// ReadContacts is a meta-interface intended to restrict callers to read-only access to contacts
type ReadContacts interface {
	GetContacts() []string
	GetContact(string) *model.PublicProfile
	GetContactAttribute(string, string) (string, bool)
}

// ModifyContacts is a meta-interface intended to restrict callers to modify-only access to contacts
type ModifyContacts interface {
	AddContact(nick, onion string, authorization model.Authorization)
	SetContactAuthorization(string, model.Authorization) error
	SetContactAttribute(string, string, string)
	DeleteContact(string)
}

// AccessPeeringState provides access to functions relating to the underlying connections of a peer.
type AccessPeeringState interface {
	GetPeerState(string) (connections.ConnectionState, bool)
}

// ModifyPeeringState is a meta-interface intended to restrict callers to modify-only access to connection peers
type ModifyPeeringState interface {
	BlockUnknownConnections()
	AllowUnknownConnections()
	PeerWithOnion(string)
	JoinServer(string) error
}

// ModifyContactsAndPeers is a meta-interface intended to restrict a call to reading and modifying contacts
// and peers.
type ModifyContactsAndPeers interface {
	ReadContacts
	ModifyContacts
	ModifyPeeringState
}

// ReadServers provides access to the servers
type ReadServers interface {
	GetServers() []string
}

// ReadGroups provides read-only access to group state
type ReadGroups interface {
	GetGroup(string) *model.Group
	GetGroupState(string) (connections.ConnectionState, bool)
	GetGroups() []string
	GetGroupAttribute(string, string) (string, bool)
	ExportGroup(string) (string, error)
}

// ModifyGroups provides write-only access add/edit/remove new groups
type ModifyGroups interface {
	ImportGroup(string) (string, error)
	StartGroup(string) (string, string, error)
	AcceptInvite(string) error
	RejectInvite(string)
	DeleteGroup(string)
	SetGroupAttribute(string, string, string)
}

// ModifyServers provides write-only access to servers
type ModifyServers interface {
	AddServer(string) error
}

// SendMessages enables a caller to sender messages to a contact
// Note:
type SendMessages interface {
	SendGetValToPeer(string, string, string)
	SendMessageToPeer(string, string) string

	// TODO This should probably not be exposed
	StoreMessage(onion string, messageTxt string, sent time.Time)

	// TODO Extract once groups are stable
	InviteOnionToGroup(string, string) error
}

// SendMessagesToGroup enables a caller to sender messages to a group
type SendMessagesToGroup interface {
	SendMessageToGroupTracked(string, string) (string, error)
}

// CwtchPeer provides us with a way of testing systems built on top of cwtch without having to
// directly implement a cwtchPeer.
type CwtchPeer interface {

	// Core Cwtch Peer Functions that should not be exposed to
	// most functions
	Init(event.Manager)
	AutoHandleEvents(events []event.Type)
	Listen()
	StartPeersConnections()
	StartServerConnections()
	Shutdown()

	// Relating to local attributes
	GetOnion() string
	SetAttribute(string, string)
	GetAttribute(string) (string, bool)

	ReadContacts
	ModifyContacts

	AccessPeeringState
	ModifyPeeringState

	ReadGroups
	ModifyGroups

	ReadServers
	ModifyServers

	SendMessages
	SendMessagesToGroup
}

// NewCwtchPeer creates and returns a new cwtchPeer with the given name.
func NewCwtchPeer(name string) CwtchPeer {
	cp := new(cwtchPeer)
	cp.Profile = model.GenerateNewProfile(name)
	cp.shutdown = false
	return cp
}

// FromProfile generates a new peer from a profile.
func FromProfile(profile *model.Profile) CwtchPeer {
	cp := new(cwtchPeer)
	cp.Profile = profile
	cp.shutdown = false
	return cp
}

// Init instantiates a cwtchPeer
func (cp *cwtchPeer) Init(eventBus event.Manager) {
	cp.InitForEvents(eventBus, DefaultEventsToHandle)
}

func (cp *cwtchPeer) InitForEvents(eventBus event.Manager, toBeHandled []event.Type) {
	cp.queue = event.NewQueue()
	go cp.eventHandler()

	cp.eventBus = eventBus
	cp.AutoHandleEvents(toBeHandled)
}

// AutoHandleEvents sets an event (if able) to be handled by this peer
func (cp *cwtchPeer) AutoHandleEvents(events []event.Type) {
	for _, ev := range events {
		if _, exists := autoHandleableEvents[ev]; exists {
			cp.eventBus.Subscribe(ev, cp.queue)
		} else {
			log.Errorf("Peer asked to autohandle event it cannot: %v\n", ev)
		}
	}
}

// ImportGroup initializes a group from an imported source rather than a peer invite
func (cp *cwtchPeer) ImportGroup(exportedInvite string) (string, error) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	gid, err := cp.Profile.ProcessInvite(exportedInvite)

	if err == nil {
		cp.eventBus.Publish(event.NewEvent(event.NewGroup, map[event.Field]string{event.GroupID: gid, event.GroupInvite: exportedInvite}))
	}

	return gid, err
}

// ExportGroup serializes a group invite so it can be given offline
func (cp *cwtchPeer) ExportGroup(groupID string) (string, error) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	group := cp.Profile.GetGroup(groupID)
	if group != nil {
		return group.Invite()
	}
	return "", errors.New("group id could not be found")
}

// StartGroup create a new group linked to the given server and returns the group ID, an invite or an error.
func (cp *cwtchPeer) StartGroup(server string) (string, string, error) {
	cp.mutex.Lock()
	groupID, invite, err := cp.Profile.StartGroup(server)
	cp.mutex.Unlock()
	if err == nil {
		group := cp.GetGroup(groupID)
		jsobj, err := json.Marshal(group)
		if err == nil {
			cp.eventBus.Publish(event.NewEvent(event.GroupCreated, map[event.Field]string{
				event.Data: string(jsobj),
			}))
		}
	} else {
		log.Errorf("error creating group: %v", err)
	}
	return groupID, invite, err
}

// GetGroups returns an unordered list of all group IDs.
func (cp *cwtchPeer) GetGroups() []string {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	return cp.Profile.GetGroups()
}

// GetGroup returns a pointer to a specific group, nil if no group exists.
func (cp *cwtchPeer) GetGroup(groupID string) *model.Group {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	return cp.Profile.GetGroup(groupID)
}

func (cp *cwtchPeer) AddContact(nick, onion string, authorization model.Authorization) {
	decodedPub, _ := base32.StdEncoding.DecodeString(strings.ToUpper(onion))
	pp := &model.PublicProfile{Name: nick, Ed25519PublicKey: decodedPub, Authorization: authorization, Onion: onion, Attributes: map[string]string{"nick": nick}}
	cp.Profile.AddContact(onion, pp)
	pd, _ := json.Marshal(pp)
	cp.eventBus.Publish(event.NewEvent(event.PeerCreated, map[event.Field]string{
		event.Data:       string(pd),
		event.RemotePeer: onion,
	}))
	cp.eventBus.Publish(event.NewEventList(event.SetPeerAuthorization, event.RemotePeer, onion, event.Authorization, string(authorization)))

	// Default to Deleting Peer History
	cp.eventBus.Publish(event.NewEventList(event.SetPeerAttribute, event.RemotePeer, onion, event.SaveHistoryKey, event.DeleteHistoryDefault))
}

// AddServer takes in a serialized server specification (a bundle of related keys) and adds a contact for the
// server assuming there are no errors and the contact doesn't already exist.
// TODO in the future this function should also integrate with a trust provider to validate the key bundle.
func (cp *cwtchPeer) AddServer(serverSpecification string) error {
	// This confirms that the server did at least sign the bundle
	keyBundle, err := model.DeserializeAndVerify([]byte(serverSpecification))
	if err != nil {
		return err
	}
	log.Debugf("Got new key bundle %v", keyBundle.Serialize())

	// TODO if the key bundle is incomplete then error out. In the future we may allow servers to attest to new
	// keys or subsets of keys, but for now they must commit only to a complete set of keys required for Cwtch Groups
	// (that way we can be assured that the keybundle we store is a valid one)
	if keyBundle.HasKeyType(model.KeyTypeTokenOnion) == false || keyBundle.HasKeyType(model.KeyTypeServerOnion) == false || keyBundle.HasKeyType(model.KeyTypePrivacyPass) == false {
		return errors.New("keybundle is incomplete")
	}

	if keyBundle.HasKeyType(model.KeyTypeServerOnion) {
		onionKey, _ := keyBundle.GetKey(model.KeyTypeServerOnion)
		onion := string(onionKey)

		// Add the contact if we don't already have it
		if cp.GetContact(onion) == nil {
			decodedPub, _ := base32.StdEncoding.DecodeString(strings.ToUpper(onion))
			ab := keyBundle.AttributeBundle()
			pp := &model.PublicProfile{Name: onion, Ed25519PublicKey: decodedPub, Authorization: model.AuthUnknown, Onion: onion, Attributes: ab}

			// The only part of this function that actually modifies the profile...
			cp.mutex.Lock()
			cp.Profile.AddContact(onion, pp)
			cp.mutex.Unlock()

			pd, _ := json.Marshal(pp)
			cp.eventBus.Publish(event.NewEvent(event.PeerCreated, map[event.Field]string{
				event.Data:       string(pd),
				event.RemotePeer: onion,
			}))
		}

		// At this point we know the server exists
		server := cp.GetContact(onion)
		ab := keyBundle.AttributeBundle()

		// Check server bundle for consistency if we have different keys stored than in the tofu bundle then we
		// abort...
		for k, v := range ab {
			val, exists := server.GetAttribute(k)
			if exists {
				if val != v {
					// this is inconsistent!
					return model.InconsistentKeyBundleError
				}
			}
			// we haven't seen this key associated with the server before
		}

		// Store the key bundle for the server so we can reconstruct a tofubundle invite
		cp.SetContactAttribute(onion, string(model.BundleType), serverSpecification)

		// If we have gotten to this point we can assume this is a safe key bundle signed by the
		// server with no conflicting keys. So we are going to publish all the keys
		for k, v := range ab {
			log.Debugf("Server (%v) has %v key %v", onion, k, v)
			cp.SetContactAttribute(onion, k, v)
		}

		return nil
	}
	return err
}

// GetContacts returns an unordered list of onions
func (cp *cwtchPeer) GetContacts() []string {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	return cp.Profile.GetContacts()
}

// GetServers returns an unordered list of servers
func (cp *cwtchPeer) GetServers() []string {
	contacts := cp.Profile.GetContacts()
	var servers []string
	for _, contact := range contacts {
		if cp.GetContact(contact).IsServer() {
			servers = append(servers, contact)
		}
	}
	return servers
}

// GetContact returns a given contact, nil is no such contact exists
func (cp *cwtchPeer) GetContact(onion string) *model.PublicProfile {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	contact, _ := cp.Profile.GetContact(onion)
	return contact
}

func (cp *cwtchPeer) GetOnion() string {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	return cp.Profile.Onion
}
func (cp *cwtchPeer) GetPeerState(onion string) (connections.ConnectionState, bool) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	if peer, ok := cp.Profile.Contacts[onion]; ok {
		return connections.ConnectionStateToType()[peer.State], true
	}
	return connections.DISCONNECTED, false
}

func (cp *cwtchPeer) GetGroupState(groupid string) (connections.ConnectionState, bool) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	if group, ok := cp.Profile.Groups[groupid]; ok {
		return connections.ConnectionStateToType()[group.State], true
	}
	return connections.DISCONNECTED, false
}

// PeerWithOnion is the entry point for cwtchPeer relationships
func (cp *cwtchPeer) PeerWithOnion(onion string) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	if _, exists := cp.Profile.GetContact(onion); !exists {
		cp.AddContact(onion, onion, model.AuthApproved)
	}
	cp.eventBus.Publish(event.NewEvent(event.PeerRequest, map[event.Field]string{event.RemotePeer: onion}))
}

// DeleteContact deletes a peer from the profile, storage, and handling
func (cp *cwtchPeer) DeleteContact(onion string) {
	cp.mutex.Lock()
	cp.Profile.DeleteContact(onion)
	defer cp.mutex.Unlock()
	cp.eventBus.Publish(event.NewEventList(event.DeleteContact, event.RemotePeer, onion))
}

// DeleteGroup deletes a Group from the profile, storage, and handling
func (cp *cwtchPeer) DeleteGroup(groupID string) {
	cp.mutex.Lock()
	cp.Profile.DeleteGroup(groupID)
	defer cp.mutex.Unlock()
	cp.eventBus.Publish(event.NewEventList(event.DeleteGroup, event.GroupID, groupID))
}

// InviteOnionToGroup kicks off the invite process
func (cp *cwtchPeer) InviteOnionToGroup(onion string, groupid string) error {
	cp.mutex.Lock()
	group := cp.Profile.GetGroup(groupid)
	if group == nil {
		cp.mutex.Unlock()
		return errors.New("invalid group id")
	}
	invite, err := group.Invite()
	cp.mutex.Unlock()
	if err == nil {
		cp.SendMessageToPeer(onion, invite)
	}
	return err
}

// JoinServer manages a new server connection with the given onion address
func (cp *cwtchPeer) JoinServer(onion string) error {
	if cp.GetContact(onion) != nil {
		tokenY, yExists := cp.GetContact(onion).GetAttribute(string(model.KeyTypePrivacyPass))
		tokenOnion, onionExists := cp.GetContact(onion).GetAttribute(string(model.KeyTypeTokenOnion))
		if yExists && onionExists {
			messages := cp.GetContact(onion).Timeline.GetMessages()
			// by default we do a full sync
			signature := base64.StdEncoding.EncodeToString([]byte{})
			// if we know of messages on the server, we only ask to receive newer messages
			if len(messages) > 0 {
				lastMessageIndex := len(messages) - 1
				signature = base64.StdEncoding.EncodeToString(messages[lastMessageIndex].Signature)
			}
			cp.eventBus.Publish(event.NewEvent(event.JoinServer, map[event.Field]string{event.GroupServer: onion, event.ServerTokenY: tokenY, event.ServerTokenOnion: tokenOnion, event.Signature: signature}))
			return nil
		}
	}
	return errors.New("no keys found for server connection")
}

// SendMessageToGroupTracked attempts to sent the given message to the given group id.
// It returns the signature of the message which can be used to identify it in any UX layer.
func (cp *cwtchPeer) SendMessageToGroupTracked(groupid string, message string) (string, error) {
	cp.mutex.Lock()
	group := cp.Profile.GetGroup(groupid)
	defer cp.mutex.Unlock()

	if group == nil {
		return "", errors.New("invalid group id")
	}
	ct, sig, err := cp.Profile.EncryptMessageToGroup(message, groupid)

	if err == nil {
		cp.eventBus.Publish(event.NewEvent(event.SendMessageToGroup, map[event.Field]string{event.GroupServer: group.GroupServer, event.Ciphertext: base64.StdEncoding.EncodeToString(ct), event.Signature: base64.StdEncoding.EncodeToString(sig)}))
	}

	return string(sig), err
}

func (cp *cwtchPeer) SendMessageToPeer(onion string, message string) string {
	event := event.NewEvent(event.SendMessageToPeer, map[event.Field]string{event.RemotePeer: onion, event.Data: message})

	cp.mutex.Lock()
	contact, _ := cp.Profile.GetContact(onion)
	event.EventID = strconv.Itoa(contact.Timeline.Len())
	cp.Profile.AddSentMessageToContactTimeline(onion, message, time.Now(), event.EventID)
	cp.mutex.Unlock()

	cp.eventBus.Publish(event)

	return event.EventID
}

func (cp *cwtchPeer) SendGetValToPeer(onion string, scope string, path string) {
	event := event.NewEventList(event.SendGetValMessageToPeer, event.RemotePeer, onion, event.Scope, scope, event.Path, path)
	cp.eventBus.Publish(event)
}

// BlockPeer blocks an existing peer relationship.
func (cp *cwtchPeer) SetContactAuthorization(peer string, authorization model.Authorization) error {
	cp.mutex.Lock()
	err := cp.Profile.SetContactAuthorization(peer, authorization)
	cp.mutex.Unlock()
	cp.eventBus.Publish(event.NewEvent(event.SetPeerAuthorization, map[event.Field]string{event.RemotePeer: peer, event.Authorization: string(authorization)}))
	return err
}

// AcceptInvite accepts a given existing group invite
func (cp *cwtchPeer) AcceptInvite(groupID string) error {
	cp.mutex.Lock()
	err := cp.Profile.AcceptInvite(groupID)
	cp.mutex.Unlock()
	if err != nil {
		return err
	}
	cp.eventBus.Publish(event.NewEvent(event.AcceptGroupInvite, map[event.Field]string{event.GroupID: groupID}))
	cp.JoinServer(cp.Profile.Groups[groupID].GroupServer)

	return nil
}

// RejectInvite rejects a given group invite.
func (cp *cwtchPeer) RejectInvite(groupID string) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	cp.Profile.RejectInvite(groupID)
	cp.eventBus.Publish(event.NewEvent(event.RejectGroupInvite, map[event.Field]string{event.GroupID: groupID}))
}

// Listen makes the peer open a listening port to accept incoming connections (and be detactably online)
func (cp *cwtchPeer) Listen() {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	if cp.listenStatus == false {
		log.Infof("cwtchPeer Listen sending ProtocolEngineStartListen\n")
		cp.listenStatus = true
		cp.eventBus.Publish(event.NewEvent(event.ProtocolEngineStartListen, map[event.Field]string{event.Onion: cp.Profile.Onion}))
	} else {
		// protocol engine is already listening
	}
}

// StartPeersConnections attempts to connect to peer connections
func (cp *cwtchPeer) StartPeersConnections() {
	for _, contact := range cp.GetContacts() {
		if cp.GetContact(contact).IsServer() == false {
			cp.PeerWithOnion(contact)
		}
	}
}

// StartServerConnections attempts to connect to all server connections
func (cp *cwtchPeer) StartServerConnections() {
	for _, contact := range cp.GetContacts() {
		if cp.GetContact(contact).IsServer() {
			cp.JoinServer(contact)
		}
	}
}

// SetAttribute sets an attribute for this profile and emits an event
func (cp *cwtchPeer) SetAttribute(key string, val string) {
	cp.mutex.Lock()
	cp.Profile.SetAttribute(key, val)
	defer cp.mutex.Unlock()
	cp.eventBus.Publish(event.NewEvent(event.SetAttribute, map[event.Field]string{
		event.Key:  key,
		event.Data: val,
	}))
}

// GetAttribute gets an attribute for the profile
func (cp *cwtchPeer) GetAttribute(key string) (string, bool) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	if val, exists := cp.Profile.GetAttribute(key); exists {
		return val, true
	}

	if key == attr.GetLocalScope("name") {
		return cp.Profile.Name, true
	}

	return "", false
}

// SetContactAttribute sets an attribute for the indicated contact and emits an event
func (cp *cwtchPeer) SetContactAttribute(onion string, key string, val string) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	if contact, ok := cp.Profile.GetContact(onion); ok {
		contact.SetAttribute(key, val)
		cp.eventBus.Publish(event.NewEvent(event.SetPeerAttribute, map[event.Field]string{
			event.RemotePeer: onion,
			event.Key:        key,
			event.Data:       val,
		}))
	}
}

// GetContactAttribute gets an attribute for the indicated contact
func (cp *cwtchPeer) GetContactAttribute(onion string, key string) (string, bool) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	if contact, ok := cp.Profile.GetContact(onion); ok {
		if val, exists := contact.GetAttribute(key); exists {
			return val, true
		}
	}
	return "", false
}

// SetGroupAttribute sets an attribute for the indicated group and emits an event
func (cp *cwtchPeer) SetGroupAttribute(gid string, key string, val string) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	if group := cp.Profile.GetGroup(gid); group != nil {
		group.SetAttribute(key, val)
		cp.eventBus.Publish(event.NewEvent(event.SetGroupAttribute, map[event.Field]string{
			event.GroupID: gid,
			event.Key:     key,
			event.Data:    val,
		}))
	}
}

// GetGroupAttribute gets an attribute for the indicated group
func (cp *cwtchPeer) GetGroupAttribute(gid string, key string) (string, bool) {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	if group := cp.Profile.GetGroup(gid); group != nil {
		if val, exists := group.GetAttribute(key); exists {
			return val, true
		}
	}
	return "", false
}

// Shutdown kills all connections and cleans up all goroutines for the peer
func (cp *cwtchPeer) Shutdown() {
	cp.mutex.Lock()
	defer cp.mutex.Unlock()
	cp.shutdown = true
	cp.queue.Shutdown()
}

func (cp *cwtchPeer) StoreMessage(onion string, messageTxt string, sent time.Time) {
	if cp.GetContact(onion) == nil {
		cp.AddContact(onion, onion, model.AuthUnknown)
	}
	cp.mutex.Lock()
	cp.Profile.AddMessageToContactTimeline(onion, messageTxt, sent)
	cp.mutex.Unlock()
}

// eventHandler process events from other subsystems
func (cp *cwtchPeer) eventHandler() {
	for {
		ev := cp.queue.Next()
		switch ev.EventType {
		/***** Default auto handled events *****/
		case event.ProtocolEngineStopped:
			cp.mutex.Lock()
			cp.listenStatus = false
			log.Infof("Protocol engine for %v has stopped listening", cp.Profile.Onion)
			cp.mutex.Unlock()
		case event.EncryptedGroupMessage:
			// If successful, a side effect is the message is added to the group's timeline
			cp.mutex.Lock()
			ciphertext, _ := base64.StdEncoding.DecodeString(ev.Data[event.Ciphertext])
			signature, _ := base64.StdEncoding.DecodeString(ev.Data[event.Signature])
			ok, groupID, message, seen := cp.Profile.AttemptDecryption(ciphertext, signature)
			cp.mutex.Unlock()
			if ok && !seen {
				cp.eventBus.Publish(event.NewEvent(event.NewMessageFromGroup, map[event.Field]string{event.TimestampReceived: message.Received.Format(time.RFC3339Nano), event.TimestampSent: message.Timestamp.Format(time.RFC3339Nano), event.Data: message.Message, event.GroupID: groupID, event.Signature: base64.StdEncoding.EncodeToString(message.Signature), event.PreviousSignature: base64.StdEncoding.EncodeToString(message.PreviousMessageSig), event.RemotePeer: message.PeerID}))
			}

		case event.NewMessageFromPeer: //event.TimestampReceived, event.RemotePeer, event.Data
			ts, _ := time.Parse(time.RFC3339Nano, ev.Data[event.TimestampReceived])
			cp.StoreMessage(ev.Data[event.RemotePeer], ev.Data[event.Data], ts)

		case event.PeerAcknowledgement:
			cp.mutex.Lock()
			idx := cp.Profile.AckSentMessageToPeer(ev.Data[event.RemotePeer], ev.Data[event.EventID])
			edata := ev.Data
			edata[event.Index] = strconv.Itoa(idx)
			cp.eventBus.Publish(event.NewEvent(event.IndexedAcknowledgement, edata))
			cp.mutex.Unlock()

		case event.SendMessageToGroupError:
			cp.mutex.Lock()
			cp.Profile.AddGroupSentMessageError(ev.Data[event.GroupServer], ev.Data[event.Signature], ev.Data[event.Error])
			cp.mutex.Unlock()

		case event.SendMessageToPeerError:
			cp.mutex.Lock()
			cp.Profile.ErrorSentMessageToPeer(ev.Data[event.RemotePeer], ev.Data[event.EventID], ev.Data[event.Error])
			cp.mutex.Unlock()
		case event.RetryServerRequest:
			// Automated Join Server Request triggered by a plugin.
			log.Infof("profile received an automated retry event for %v", ev.Data[event.GroupServer])
			cp.JoinServer(ev.Data[event.GroupServer])
		case event.NewGetValMessageFromPeer:
			onion := ev.Data[event.RemotePeer]
			scope := ev.Data[event.Scope]
			path := ev.Data[event.Path]

			log.Debugf("NewGetValMessageFromPeer for %v%v from %v\n", scope, path, onion)

			remotePeer := cp.GetContact(onion)
			if remotePeer != nil && remotePeer.Authorization == model.AuthApproved {
				if scope == attr.PublicScope {
					val, exists := cp.GetAttribute(attr.GetPublicScope(path))
					resp := event.NewEvent(event.SendRetValMessageToPeer, map[event.Field]string{event.RemotePeer: onion, event.Exists: strconv.FormatBool(exists)})
					resp.EventID = ev.EventID
					if exists {
						resp.Data[event.Data] = val
					} else {
						resp.Data[event.Data] = ""
					}
					log.Debugf("Responding with SendRetValMessageToPeer exists:%v data: %v\n", exists, val)

					cp.eventBus.Publish(resp)
				}
			}

		/***** Non default but requestable handlable events *****/

		case event.NewRetValMessageFromPeer:
			onion := ev.Data[event.RemotePeer]
			scope := ev.Data[event.Scope]
			path := ev.Data[event.Path]
			val := ev.Data[event.Data]
			exists, _ := strconv.ParseBool(ev.Data[event.Exists])
			log.Debugf("NewRetValMessageFromPeer %v %v%v %v %v\n", onion, scope, path, exists, val)
			if exists {
				if scope == attr.PublicScope {
					cp.SetContactAttribute(onion, attr.GetPeerScope(path), val)
				}
			}
		case event.PeerStateChange:
			cp.mutex.Lock()
			if _, exists := cp.Profile.Contacts[ev.Data[event.RemotePeer]]; exists {
				cp.Profile.Contacts[ev.Data[event.RemotePeer]].State = ev.Data[event.ConnectionState]
			}
			cp.mutex.Unlock()
		case event.ServerStateChange:
			cp.mutex.Lock()
			for _, group := range cp.Profile.Groups {
				if group.GroupServer == ev.Data[event.GroupServer] {
					group.State = ev.Data[event.ConnectionState]
				}
			}
			cp.mutex.Unlock()

		default:
			if ev.EventType != "" {
				log.Errorf("peer event handler received an event it was not subscribed for: %v", ev.EventType)
			}
			return
		}
	}
}