/
subscribe.go
307 lines (253 loc) · 7.95 KB
/
subscribe.go
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package client
import (
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/sha512"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"fmt"
"github.com/eoscanada/eos-go/ecc"
"github.com/iryonetwork/network-poc/logger"
"github.com/iryonetwork/network-poc/openEHR/ehrdata"
"github.com/iryonetwork/network-poc/requests"
"github.com/iryonetwork/network-poc/state"
"github.com/iryonetwork/network-poc/storage/ehr"
"github.com/iryonetwork/network-poc/storage/eos"
)
type subscribe struct {
eos *eos.Storage
ehr *ehr.Storage
requests *requests.Requests
ws *Ws
client *Client
state *state.State
log *logger.Log
connecter connecter
}
type connecter interface{
Connect(string, string) error
}
func NewMessageHandler(state *state.State, ehr *ehr.Storage, eos *eos.Storage, log *logger.Log) *subscribe {
return &subscribe{eos: eos, ehr: ehr, state: state, log: log}
}
func (s *subscribe) SetClient(client *Client) MessageHandler {
s.client = client
return s
}
func (s *subscribe) SetWs(ws *Ws) MessageHandler {
s.ws = ws
return s
}
func (s *subscribe) SetRequests(requests *requests.Requests) MessageHandler {
s.requests = requests
return s
}
func (s *subscribe) SetConnecter(c connecter) MessageHandler {
s.connecter = c
return s
}
func (s *subscribe) ImportKey(r *requests.Request) {
keyenc, err := base64.StdEncoding.DecodeString(subscribeGetStringDataFromRequest(r, "key", s.log))
if err != nil {
s.log.Debugf("Error decoding key from base64; %v", err)
}
from := subscribeGetStringDataFromRequest(r, "from", s.log)
name := subscribeGetStringDataFromRequest(r, "name", s.log)
customData := subscribeGetStringDataFromRequest(r, "customData", s.log)
rnd := rand.Reader
key, err := rsa.DecryptOAEP(sha512.New(), rnd, s.state.RSAKey, keyenc, []byte{})
if err != nil {
s.log.Printf("Error decrypting key: %v", err)
return
}
s.log.Debugf("SUBSCRIPTION:: Importing key from user %s (%s)", from, customData)
s.state.Directory[from] = name
s.state.EncryptionKeys[from] = key
exists := false
for _, name := range s.state.Connections.WithKey {
if name == from {
exists = true
}
}
if !exists {
s.state.Connections.WithKey = append(s.state.Connections.WithKey, from)
}
if s.connecter != nil {
if err:= s.connecter.Connect(from, customData); err != nil {
s.log.Debugf("Failed to call external Connect function when import keys for %s (%s)", from, customData)
}
}
s.log.Debugf("SUBSCRIPTION:: Imported key from %s ", from)
}
func (s *subscribe) RevokeKey(r *requests.Request) {
from := subscribeGetStringDataFromRequest(r, "from", s.log)
s.log.Debugf("SUBSCRIPTION:: Revoking %s's key", from)
s.ehr.RemoveUser(from)
delete(s.state.EncryptionKeys, from)
for i, v := range s.state.Connections.WithKey {
if v == from {
s.state.Connections.WithKey = append(s.state.Connections.WithKey[:i], s.state.Connections.WithKey[i+1:]...)
s.log.Debugf("SUBSCRIPTION:: Revoked %s's key ", from)
}
}
}
func (s *subscribe) SubReencrypt(r *requests.Request) {
from := subscribeGetStringDataFromRequest(r, "from", s.log)
s.ehr.RemoveUser(from)
err := s.requests.RequestsKey(from, "")
if err != nil {
s.log.Printf("Error creating RequestKey: %v", err)
}
}
func (s *subscribe) AccessWasGranted(r *requests.Request) {
name := subscribeGetStringDataFromRequest(r, "name", s.log)
from := subscribeGetStringDataFromRequest(r, "from", s.log)
s.log.Debugf("Got notification 'accessGranted' from %s", from)
s.state.Directory[from] = name
// check if we already have the user's key
for _, v := range s.state.Connections.WithKey {
if v == from {
return
}
}
// check if user's already on the list of connections without key
onlist := false
for _, v := range s.state.Connections.WithKey {
if v == from {
onlist = true
}
}
// if its not on list add it
if !onlist {
s.state.Connections.WithoutKey = append(s.state.Connections.WithoutKey, from)
}
// automatically request key
if err := s.requests.RequestsKey(from, ""); err != nil {
s.log.Printf("Error occurred while requesting key %s", err.Error())
}
}
func (s *subscribe) NotifyKeyRequested(r *requests.Request) {
s.log.Debugf("SUBSCRIPTION:: Got RequestKey request")
from := subscribeGetStringDataFromRequest(r, "from", s.log)
name := subscribeGetStringDataFromRequest(r, "name", s.log)
rsakey := subscribeGetDataFromRequest(r, "key", s.log)
sign := subscribeGetStringDataFromRequest(r, "signature", s.log)
customData := subscribeGetStringDataFromRequest(r, "customData", s.log)
// Check if account and key are connected
valid, err := s.verifyRequestKeyRequest(sign, from, rsakey)
if err != nil {
s.log.Printf("Error checking valid account: %v", err)
return
}
if !valid {
s.log.Printf("SUBSCRIBE:: request could not be verified")
return
}
// Save the request to storage for later usage
pubKey, err := rsaPEMKeyToRSAPublicKey(rsakey)
if err != nil {
s.log.Printf("SUBSCRIBE:: Error getting rsa public key; %v", err)
}
s.state.Connections.Requested[from] = state.Request{Key: pubKey, CustomData: customData}
// Add user to directory
s.state.Directory[from] = name
// Check if access is already granted
// if it is, send the key without prompting the user for confirmation
granted, err := s.eos.AccessGranted(s.state.EosAccount, from)
if err != nil {
s.log.Printf("Error getting key: %v", err)
}
if granted {
s.requests.SendKey(from)
// make sure they are on the list
add := false
for _, name := range s.state.Connections.GrantedTo {
if name == from {
add = false
}
}
if add {
s.state.Connections.GrantedTo = append(s.state.Connections.GrantedTo, from)
}
// Delete the user from requests
delete(s.state.Connections.Requested, from)
}
}
func (s *subscribe) NewUpload(r *requests.Request) {
account := subscribeGetStringDataFromRequest(r, "user", s.log)
s.log.Debugf("New file for user: %s", account)
err := s.client.Update(account)
if err != nil {
s.log.Debugf("error updating: %v", err)
}
dataMap, err := ehrdata.ExtractEhrData(account, s.ehr, s.state)
if err != nil {
s.log.Debugf("Error getting ehrdata: %v", err)
}
data, err := json.Marshal(dataMap)
if err != nil {
s.log.Debugf("Error marshaling json: %v", err)
}
userdata := []byte(fmt.Sprintf(`{"account":"%s"}`, account))
for _, conn := range s.ws.frontendConn {
err = conn.WriteMessage(1, append(userdata, data...))
if err != nil {
s.log.Debugf("Error writing message: %v", err)
}
}
}
func subscribeGetStringDataFromRequest(r *requests.Request, key string, log *logger.Log) string {
out, err := r.GetDataString(key)
if err != nil {
log.Printf("Error getting `%s`: %v", key, err)
}
return out
}
func subscribeGetDataFromRequest(r *requests.Request, key string, log *logger.Log) []byte {
out, err := r.GetData(key)
if err != nil {
log.Printf("Error getting `%s`: %v", key, err)
}
return out
}
func rsaPEMKeyToRSAPublicKey(pubPEMData []byte) (*rsa.PublicKey, error) {
block, _ := pem.Decode(pubPEMData)
if block == nil || block.Type != "PUBLIC KEY" {
return nil, fmt.Errorf("failed to decode PEM block containing public key")
}
pub, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, err
}
pubKey, ok := pub.(*rsa.PublicKey)
if !ok {
return nil, fmt.Errorf("Failed to cast pub to rsa.PublicKey (got %T)", pub)
}
return pubKey, err
}
func (s *subscribe) verifyRequestKeyRequest(signature, from string, rsakey []byte) (bool, error) {
eoskey, err := requestGetKeyFromSignature(signature, rsakey)
if err != nil {
return false, err
}
return s.eos.CheckAccountKey(from, eoskey.String())
}
func requestGetKeyFromSignature(strsign string, rsakey []byte) (ecc.PublicKey, error) {
sign, err := ecc.NewSignature(strsign)
if err != nil {
return ecc.PublicKey{}, err
}
key, err := sign.PublicKey(getHash(rsakey))
if err != nil {
return ecc.PublicKey{}, fmt.Errorf("Signture could not be verified; %v", err)
}
return key, nil
}
func getHash(in []byte) []byte {
sha := sha256.New()
sha.Write(in)
return sha.Sum(nil)
}