diff --git a/pkg/models/channels.go b/pkg/models/channels.go
index 7dc7ddb..fa40264 100644
--- a/pkg/models/channels.go
+++ b/pkg/models/channels.go
@@ -38,6 +38,7 @@ type ChannelMember struct {
 
 	ChannelID  uint        `json:"channel_id"`
 	AccountID  uint        `json:"account_id"`
+	Nick       *string     `json:"nick"`
 	Channel    Channel     `json:"channel"`
 	Account    Account     `json:"account"`
 	Notify     NotifyLevel `json:"notify"`
diff --git a/pkg/server/channel_members_api.go b/pkg/server/channel_members_api.go
index 8865297..abdd8c7 100644
--- a/pkg/server/channel_members_api.go
+++ b/pkg/server/channel_members_api.go
@@ -30,6 +30,28 @@ func listChannelMembers(c *fiber.Ctx) error {
 	}
 }
 
+func getMyChannelMembership(c *fiber.Ctx) error {
+	alias := c.Params("channel")
+	user := c.Locals("principal").(models.Account)
+
+	var err error
+	var channel models.Channel
+	if val, ok := c.Locals("realm").(models.Realm); ok {
+		channel, err = services.GetChannelWithAlias(alias, val.ID)
+	} else {
+		channel, err = services.GetChannelWithAlias(alias)
+	}
+	if err != nil {
+		return fiber.NewError(fiber.StatusNotFound, err.Error())
+	}
+
+	if member, err := services.GetChannelMember(user, channel.ID); err != nil {
+		return fiber.NewError(fiber.StatusNotFound, err.Error())
+	} else {
+		return c.JSON(member)
+	}
+}
+
 func addChannelMember(c *fiber.Ctx) error {
 	user := c.Locals("principal").(models.Account)
 	alias := c.Params("channel")
@@ -118,7 +140,8 @@ func editChannelMembership(c *fiber.Ctx) error {
 	alias := c.Params("channel")
 
 	var data struct {
-		NotifyLevel int8 `json:"notify_level"`
+		Nick        string `json:"nick"`
+		NotifyLevel int8   `json:"notify_level"`
 	}
 
 	if err := BindAndValidate(c, &data); err != nil {
@@ -139,6 +162,11 @@ func editChannelMembership(c *fiber.Ctx) error {
 	}
 
 	membership.Notify = data.NotifyLevel
+	if len(data.Nick) > 0 {
+		membership.Nick = &data.Nick
+	} else {
+		membership.Nick = nil
+	}
 
 	if membership, err := services.EditChannelMember(membership); err != nil {
 		return fiber.NewError(fiber.StatusBadRequest, err.Error())
diff --git a/pkg/server/messages_api.go b/pkg/server/messages_api.go
index 30ad6ba..99150a6 100644
--- a/pkg/server/messages_api.go
+++ b/pkg/server/messages_api.go
@@ -86,6 +86,8 @@ func newMessage(c *fiber.Ctx) error {
 		channel, member, err = services.GetAvailableChannelWithAlias(alias, user)
 		if err != nil {
 			return fiber.NewError(fiber.StatusNotFound, err.Error())
+		} else if member.PowerLevel < 0 {
+			return fiber.NewError(fiber.StatusForbidden, "you have not enough permission to send message")
 		}
 	}
 
diff --git a/pkg/server/startup.go b/pkg/server/startup.go
index 398350a..db022a6 100644
--- a/pkg/server/startup.go
+++ b/pkg/server/startup.go
@@ -81,6 +81,7 @@ func NewServer() {
 
 			channels.Get("/:channel/members", listChannelMembers)
 			channels.Put("/:channel/members", authMiddleware, editChannelMembership)
+			channels.Get("/:channel/members/me", authMiddleware, getMyChannelMembership)
 			channels.Post("/:channel/members", authMiddleware, addChannelMember)
 			channels.Post("/:channel/members/me", authMiddleware, joinChannel)
 			channels.Delete("/:channel/members", authMiddleware, removeChannelMember)