Return http.StatusNotFound error when trying to get a channel by name without permissions (#13443)

api4/channel.go

@@ -992,7 +992,7 @@ func getChannelByName(c *Context, w http.ResponseWriter, r *http.Request) {
 		}
 	} else {
 		if !c.App.SessionHasPermissionToChannel(c.App.Session, channel.Id, model.PERMISSION_READ_CHANNEL) {
-			c.SetPermissionError(model.PERMISSION_READ_CHANNEL)
+			c.Err = model.NewAppError("getChannelByName", store.MISSING_CHANNEL_ERROR, nil, "teamId="+channel.TeamId+", "+"name="+channel.Name+"", http.StatusNotFound)
 			return
 		}
 	}
@@ -1021,7 +1021,7 @@ func getChannelByNameForTeamName(c *Context, w http.ResponseWriter, r *http.Requ
 	}
 
 	if !c.App.SessionHasPermissionToChannel(c.App.Session, channel.Id, model.PERMISSION_READ_CHANNEL) {
-		c.SetPermissionError(model.PERMISSION_READ_CHANNEL)
+		c.Err = model.NewAppError("getChannelByNameForTeamName", store.MISSING_CHANNEL_ERROR, nil, "teamId="+channel.TeamId+", "+"name="+channel.Name+"", http.StatusNotFound)
 		return
 	}
 

api4/channel_test.go

@@ -1500,7 +1500,7 @@ func TestGetChannelByName(t *testing.T) {
 
 	Client.RemoveUserFromChannel(th.BasicPrivateChannel.Id, th.BasicUser.Id)
 	_, resp = Client.GetChannelByName(th.BasicPrivateChannel.Name, th.BasicTeam.Id, "")
-	CheckForbiddenStatus(t, resp)
+	CheckNotFoundStatus(t, resp)
 
 	_, resp = Client.GetChannelByName(GenerateTestChannelName(), th.BasicTeam.Id, "")
 	CheckNotFoundStatus(t, resp)
@@ -1553,7 +1553,7 @@ func TestGetChannelByNameForTeamName(t *testing.T) {
 	user := th.CreateUser()
 	Client.Login(user.Email, user.Password)
 	_, resp = Client.GetChannelByNameForTeamName(th.BasicChannel.Name, th.BasicTeam.Name, "")
-	CheckForbiddenStatus(t, resp)
+	CheckNotFoundStatus(t, resp)
 }
 
 func TestGetChannelMembers(t *testing.T) {