Make SetPermissions part of the client interface.

client.go

@@ -5,10 +5,17 @@ type clientCredentials struct {
 	Password string `json:"password,omitempty"`
 }
 
+type clientPermissions struct {
+	Op      bool `json:"op,omitempty"`
+	Present bool `json:"present,omitempty"`
+	Record  bool `json:"record,omitempty"`
+}
+
 type client interface {
 	Group() *group
 	Id() string
 	Credentials() clientCredentials
+	SetPermissions(clientPermissions)
 	pushConn(id string, conn upConnection, tracks []upTrack, label string) error
 	pushClient(id, username string, add bool) error
 }

disk.go

@@ -36,6 +36,10 @@ func (client *diskClient) Credentials() clientCredentials {
 	return clientCredentials{"RECORDING", ""}
 }
 
+func (client *diskClient) SetPermissions(perms clientPermissions) {
+	return
+}
+
 func (client *diskClient) pushClient(id, username string, add bool) error {
 	return nil
 }

group.go

@@ -190,10 +190,8 @@ func addClient(name string, c client) (*group, error) {
 	if err != nil {
 		return nil, err
 	}
-	w, ok := c.(*webClient)
-	if ok {
-		w.permissions = perms
-	}
+
+	c.SetPermissions(perms)
 
 	if !perms.Op && atomic.LoadUint32(&g.locked) != 0 {
 		return nil, userError("group is locked")
@@ -396,14 +394,8 @@ func getDescription(name string) (*groupDescription, error) {
 	return &desc, nil
 }
 
-type clientPermission struct {
-	Op      bool `json:"op,omitempty"`
-	Present bool `json:"present,omitempty"`
-	Record  bool `json:"record,omitempty"`
-}
-
-func getPermission(desc *groupDescription, creds clientCredentials) (clientPermission, error) {
-	var p clientPermission
+func getPermission(desc *groupDescription, creds clientCredentials) (clientPermissions, error) {
+	var p clientPermissions
 	if !desc.AllowAnonymous && creds.Username == "" {
 		return p, userError("anonymous users not allowed in this group, please choose a username")
 	}

webclient.go

@@ -87,7 +87,7 @@ type webClient struct {
 	group       *group
 	id          string
 	credentials clientCredentials
-	permissions clientPermission
+	permissions clientPermissions
 	requested   map[string]uint32
 	done        chan struct{}
 	writeCh     chan interface{}
@@ -111,6 +111,10 @@ func (c *webClient) Credentials() clientCredentials {
 	return c.credentials
 }
 
+func (c *webClient) SetPermissions(perms clientPermissions) {
+	c.permissions = perms
+}
+
 func (c *webClient) pushClient(id, username string, add bool) error {
 	kind := "add"
 	if !add {
@@ -177,7 +181,7 @@ type clientMessage struct {
 	Id          string                     `json:"id,omitempty"`
 	Username    string                     `json:"username,omitempty"`
 	Password    string                     `json:"password,omitempty"`
-	Permissions clientPermission           `json:"permissions,omitempty"`
+	Permissions clientPermissions          `json:"permissions,omitempty"`
 	Group       string                     `json:"group,omitempty"`
 	Value       string                     `json:"value,omitempty"`
 	Offer       *webrtc.SessionDescription `json:"offer,omitempty"`