Allow accounts to be preloaded via config if using MemAccResolver.

Signed-off-by: Derek Collison <derek@nats.io>

server/opts.go

@@ -136,6 +136,7 @@ type Options struct {
 	TrustedKeys      []string              `json:"-"`
 	TrustedOperators []*jwt.OperatorClaims `json:"-"`
 	AccountResolver  AccountResolver       `json:"-"`
+	resolverPreloads map[string]string
 
 	CustomClientAuthentication Authentication `json:"-"`
 	CustomRouterAuthentication Authentication `json:"-"`
@@ -544,6 +545,24 @@ func (o *Options) ProcessConfigFile(configFile string) error {
 				err := &configErr{tk, fmt.Sprintf("error parsing account resolver, should be MEM or URL(\"url\")")}
 				errors = append(errors, err)
 			}
+		case "resolver_preload":
+			mp, ok := v.(map[string]interface{})
+			if !ok {
+				err := &configErr{tk, fmt.Sprintf("preload should be a map of key:jwt")}
+				errors = append(errors, err)
+				continue
+			}
+			o.resolverPreloads = make(map[string]string)
+			for key, val := range mp {
+				tk, val = unwrapValue(val)
+				if jwt, ok := val.(string); !ok {
+					err := &configErr{tk, fmt.Sprintf("preload map value should be a string jwt")}
+					errors = append(errors, err)
+					continue
+				} else {
+					o.resolverPreloads[key] = jwt
+				}
+			}
 		case "system_account", "system":
 			if sa, ok := v.(string); !ok {
 				err := &configErr{tk, fmt.Sprintf("system account name must be a string")}

server/server.go

@@ -328,9 +328,18 @@ func (s *Server) configureAccounts() error {
 	for _, acc := range s.opts.Accounts {
 		s.registerAccount(acc)
 	}
+
 	// Check for configured account resolvers.
 	if opts.AccountResolver != nil {
 		s.accResolver = opts.AccountResolver
+		if len(opts.resolverPreloads) > 0 {
+			if _, ok := s.accResolver.(*MemAccResolver); !ok {
+				return fmt.Errorf("Resolver preloads only available for MemAccResolver")
+			}
+			for k, v := range opts.resolverPreloads {
+				s.accResolver.Store(k, v)
+			}
+		}
 	}
 
 	// Set the system account if it was configured.

test/configs/operator.conf

@@ -13,4 +13,4 @@ operator = "./configs/nkeys/op.jwt"
 # E.g.
 # resolver = URL("https://api.synadia.com/ngs/v1/accounts/jwt")
 #
-resolver = MEMORY
+resolver = MEMORY

test/configs/resolver_preload.conf

@@ -0,0 +1,26 @@
+# Server that loads an operator JWT
+
+listen: 127.0.0.1:22222
+
+# Can be an array of filenames as well.
+# Key can be operator, operators, roots, root, root_operators, root_operator
+
+operator = "./configs/nkeys/op.jwt"
+
+system_account = "AD2VB6C25DQPEUUQ7KJBUFX2J4ZNVBPOHSCBISC7VFZXVWXZA7VASQZG"
+
+# This is for account resolution.
+# Can be MEMORY (Testing) or can be URL(url).
+# The resolver will append the account name to url for retrieval.
+# E.g.
+# resolver = URL("https://api.synadia.com/ngs/v1/accounts/jwt")
+#
+resolver = MEMORY
+
+# This is a map that can preload keys:jwts into a memory resolver.
+resolver_preload = {
+    AD2VB6C25DQPEUUQ7KJBUFX2J4ZNVBPOHSCBISC7VFZXVWXZA7VASQZG : "eyJ0eXAiOiJqd3QiLCJhbGciOiJlZDI1NTE5In0.eyJqdGkiOiJDSzU1UERKSUlTWU5QWkhLSUpMVURVVTdJT1dINlM3UkE0RUc2TTVGVUQzUEdGQ1RWWlJRIiwiaWF0IjoxNTQzOTU4NjU4LCJpc3MiOiJPQ0FUMzNNVFZVMlZVT0lNR05HVU5YSjY2QUgyUkxTREFGM01VQkNZQVk1UU1JTDY1TlFNNlhRRyIsInN1YiI6IkFEMlZCNkMyNURRUEVVVVE3S0pCVUZYMko0Wk5WQlBPSFNDQklTQzdWRlpYVldYWkE3VkFTUVpHIiwidHlwZSI6ImFjY291bnQiLCJuYXRzIjp7ImxpbWl0cyI6e319fQ.7m1fysYUsBw15Lj88YmYoHxOI4HlOzu6qgP8Zg-1q9mQXUURijuDGVZrtb7gFYRlo-nG9xZyd2ZTRpMA-b0xCQ"
+
+    ADM2CIIL3RWXBA6T2HW3FODNCQQOUJEHHQD6FKCPVAMHDNTTSMO73ROX: "eyJ0eXAiOiJqd3QiLCJhbGciOiJlZDI1NTE5In0.eyJqdGkiOiJCMk0zTFRMT1ZNRk03REY3U0M3SE9RTzNXUzI2RFhMTURINk0zRzY3RzRXRFdTWExPNlVBIiwiaWF0IjoxNTQzOTU4NzI0LCJpc3MiOiJPQ0FUMzNNVFZVMlZVT0lNR05HVU5YSjY2QUgyUkxTREFGM01VQkNZQVk1UU1JTDY1TlFNNlhRRyIsInN1YiI6IkFETTJDSUlMM1JXWEJBNlQySFczRk9ETkNRUU9VSkVISFFENkZLQ1BWQU1IRE5UVFNNTzczUk9YIiwidHlwZSI6ImFjY291bnQiLCJuYXRzIjp7ImxpbWl0cyI6e319fQ.pvvPmBei_IFEbspHGN5FkWJoSfHk8BVeJCCVODTgul8-xUU8p1fidvsg3sgMvrXqXtmL8SFc68jGQd0nGtk5Dw"
+
+}

test/operator_test.go

@@ -233,3 +233,20 @@ func TestOperatorSigningKeys(t *testing.T) {
 	}
 	nc.Close()
 }
+
+func TestOperatorMemResolverPreload(t *testing.T) {
+	s, opts := RunServerWithConfig("./configs/resolver_preload.conf")
+
+	// Make sure we can look up the account.
+	acc := s.LookupAccount("ADM2CIIL3RWXBA6T2HW3FODNCQQOUJEHHQD6FKCPVAMHDNTTSMO73ROX")
+	if acc == nil {
+		t.Fatalf("Expected to properly lookup account")
+	}
+	sacc := s.SystemAccount()
+	if sacc == nil {
+		t.Fatalf("Expected to have system account registered")
+	}
+	if sacc.Name != opts.SystemAccount {
+		t.Fatalf("System account does not match, wanted %q, got %q", opts.SystemAccount, sacc.Name)
+	}
+}