[APIv4] add getChannelMembersTimezone (#9286)

* add getChannelMembersTimezone

* update per feedback review

* add delimeter to error

2 files changed, 70 insertions, 1 deletions

diff --git a/api4/channel.go b/api4/channel.go
index 02a7c34b5..e3a5bf703 100644
--- a/api4/channel.go
+++ b/api4/channel.go
@@ -33,7 +33,7 @@ func (api *API) InitChannel() {
 	api.BaseRoutes.Channel.Handle("", api.ApiSessionRequired(deleteChannel)).Methods("DELETE")
 	api.BaseRoutes.Channel.Handle("/stats", api.ApiSessionRequired(getChannelStats)).Methods("GET")
 	api.BaseRoutes.Channel.Handle("/pinned", api.ApiSessionRequired(getPinnedPosts)).Methods("GET")
-
+	api.BaseRoutes.Channel.Handle("/timezones", api.ApiSessionRequired(getChannelMembersTimezones)).Methods("GET")
 	api.BaseRoutes.ChannelForUser.Handle("/unread", api.ApiSessionRequired(getChannelUnread)).Methods("GET")
 
 	api.BaseRoutes.ChannelByName.Handle("", api.ApiSessionRequired(getChannelByName)).Methods("GET")
@@ -821,6 +821,26 @@ func getChannelMembers(c *Context, w http.ResponseWriter, r *http.Request) {
 	w.Write([]byte(members.ToJson()))
 }
 
+func getChannelMembersTimezones(c *Context, w http.ResponseWriter, r *http.Request) {
+	c.RequireChannelId()
+	if c.Err != nil {
+		return
+	}
+
+	if !c.App.SessionHasPermissionToChannel(c.Session, c.Params.ChannelId, model.PERMISSION_READ_CHANNEL) {
+		c.SetPermissionError(model.PERMISSION_READ_CHANNEL)
+		return
+	}
+
+	membersTimezones, err := c.App.GetChannelMembersTimezones(c.Params.ChannelId)
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	w.Write([]byte(model.ArrayToJson(membersTimezones)))
+}
+
 func getChannelMembersByIds(c *Context, w http.ResponseWriter, r *http.Request) {
 	c.RequireChannelId()
 	if c.Err != nil {
diff --git a/api4/channel_test.go b/api4/channel_test.go
index 918b37c0f..d588c0c25 100644
--- a/api4/channel_test.go
+++ b/api4/channel_test.go
@@ -2335,3 +2335,52 @@ func TestUpdateChannelScheme(t *testing.T) {
 	_, resp = th.SystemAdminClient.UpdateChannelScheme(channel.Id, channelScheme.Id)
 	CheckUnauthorizedStatus(t, resp)
 }
+
+func TestGetChannelMembersTimezones(t *testing.T) {
+	th := Setup().InitBasic().InitSystemAdmin()
+	defer th.TearDown()
+	Client := th.Client
+
+	user := th.BasicUser
+	user.Timezone["useAutomaticTimezone"] = "false"
+	user.Timezone["manualTimezone"] = "XOXO/BLABLA"
+	_, resp := Client.UpdateUser(user)
+	CheckNoError(t, resp)
+
+	user2 := th.BasicUser2
+	user2.Timezone["automaticTimezone"] = "NoWhere/Island"
+	_, resp = th.SystemAdminClient.UpdateUser(user2)
+	CheckNoError(t, resp)
+
+	timezone, resp := Client.GetChannelMembersTimezones(th.BasicChannel.Id)
+	CheckNoError(t, resp)
+	if len(timezone) != 2 {
+		t.Fatal("should return 2 timezones")
+	}
+
+	//both users have same timezone
+	user2.Timezone["automaticTimezone"] = "XOXO/BLABLA"
+	_, resp = th.SystemAdminClient.UpdateUser(user2)
+	CheckNoError(t, resp)
+
+	timezone, resp = Client.GetChannelMembersTimezones(th.BasicChannel.Id)
+	CheckNoError(t, resp)
+	if len(timezone) != 1 {
+		t.Fatal("should return 1 timezone")
+	}
+
+	//no timezone set should return empty
+	user2.Timezone["automaticTimezone"] = ""
+	_, resp = th.SystemAdminClient.UpdateUser(user2)
+	CheckNoError(t, resp)
+
+	user.Timezone["manualTimezone"] = ""
+	_, resp = Client.UpdateUser(user)
+
+	timezone, resp = Client.GetChannelMembersTimezones(th.BasicChannel.Id)
+	CheckNoError(t, resp)
+	if len(timezone) > 0 {
+		t.Fatal("should return 0 timezone")
+	}
+
+}