MM-53125 Add feature to convert group message to private channel (#24421)

* Added convert to channel menu item

* WIP

* refactored channel name input field and created conversion modal

* style

* style

* WIP

* wip

* Created API to fetch common teams of GM members

* Added UI for all members deactivated

* Fetched common teams in client

* WIP

* Added a required attribute to DropdownInput component

* Fixed a case with dropdown input required flag

* WIP

* API first draft

* Genetayed layers and mocks

* Fixed create channel bug

* WIP

* Added cache invalidation

* Calling API from client

* Updated API to accept name and display name as well

* WIP

* Moved converted GM to correct category

* Style fixes

* Added logic to move user to new team/channel after GM conversion

* Prevented guest user from performing action

* Added loading indicator

* Added smoother height transistion when loading finishes

* UI imporvements

* WIP

* Formatted GM conversion message on client side

* lint fix

* Moved convert option from sidebar menu to channel header menu

* Some cleanup

* Updated server layers

* Fixed i18n

* Fixed types

* Fix server i18n

* Fixed channel creation bug

* Added store test for GetCommonTeamIDsForMultipleUsers

* Server tests done

* Updated snapshots

* Updated layers

* lint fix

* Update tests

* For CI

* lint

* restored debug code

* Used user ID instead of username in channel conversion post

* WIP

* Review fixes

* LInt fixes

* Test fix

* WIP

* WIP

* WIP

* wip

* Review fixes, lots of them

* Review fix

* Disabled WIP test

* test

* Cleanup

* Test fix

* removed testing line

* Fixed incorrect default message

* Review fixes

* Fixes

* lint and i18n fix

* Setting category on server side

* updated i18n

* Updated tests

* Added tests

* Refs cleanup

* added test

---------

Co-authored-by: Harshil Sharma <harshilsharma@Harshils-MacBook-Pro.local>

server/channels/api4/channel.go

@@ -60,6 +60,8 @@ func (api *API) InitChannel() {
 	api.BaseRoutes.Channel.Handle("/members_minus_group_members", api.APISessionRequired(channelMembersMinusGroupMembers)).Methods("GET")
 	api.BaseRoutes.Channel.Handle("/move", api.APISessionRequired(moveChannel)).Methods("POST")
 	api.BaseRoutes.Channel.Handle("/member_counts_by_group", api.APISessionRequired(channelMemberCountsByGroup)).Methods("GET")
+	api.BaseRoutes.Channel.Handle("/common_teams", api.APISessionRequired(getGroupMessageMembersCommonTeams)).Methods("GET")
+	api.BaseRoutes.Channel.Handle("/convert_to_channel", api.APISessionRequired(convertGroupMessageToChannel)).Methods("POST")
 
 	api.BaseRoutes.ChannelForUser.Handle("/unread", api.APISessionRequired(getChannelUnread)).Methods("GET")
 
@@ -2194,3 +2196,86 @@ func moveChannel(c *Context, w http.ResponseWriter, r *http.Request) {
 		c.Logger.Warn("Error while writing response", mlog.Err(err))
 	}
 }
+
+func getGroupMessageMembersCommonTeams(c *Context, w http.ResponseWriter, r *http.Request) {
+	c.RequireChannelId()
+	if c.Err != nil {
+		return
+	}
+
+	user, err := c.App.GetUser(c.AppContext.Session().UserId)
+	if err != nil {
+		c.Err = err
+		return
+	}
+	if user.IsGuest() {
+		c.Err = model.NewAppError("Api4.getGroupMessageMembersCommonTeams", "api.channel.gm_to_channel_conversion.not_allowed_for_user.request_error", nil, "userId="+c.AppContext.Session().UserId, http.StatusForbidden)
+		return
+	}
+
+	if !c.App.SessionHasPermissionToChannel(c.AppContext, *c.AppContext.Session(), c.Params.ChannelId, model.PermissionReadChannel) {
+		c.SetPermissionError(model.PermissionReadChannel)
+		return
+	}
+
+	teams, appErr := c.App.GetGroupMessageMembersCommonTeams(c.AppContext, c.Params.ChannelId)
+	if appErr != nil {
+		c.Err = appErr
+		return
+	}
+
+	if err := json.NewEncoder(w).Encode(teams); err != nil {
+		c.Logger.Warn("Error while writing response from getGroupMessageMembersCommonTeams", mlog.Err(err))
+	}
+}
+
+func convertGroupMessageToChannel(c *Context, w http.ResponseWriter, r *http.Request) {
+	c.RequireChannelId()
+	if c.Err != nil {
+		return
+	}
+
+	var gmConversionRequest *model.GroupMessageConversionRequestBody
+	if err := json.NewDecoder(r.Body).Decode(&gmConversionRequest); err != nil {
+		c.SetInvalidParamWithErr("body", err)
+		return
+	}
+
+	user, err := c.App.GetUser(c.AppContext.Session().UserId)
+	if err != nil {
+		c.Err = err
+		return
+	}
+	if user.IsGuest() {
+		c.Err = model.NewAppError("Api4.convertGroupMessageToChannel", "api.channel.gm_to_channel_conversion.not_allowed_for_user.request_error", nil, "userId="+c.AppContext.Session().UserId, http.StatusForbidden)
+		return
+	}
+
+	if !c.App.SessionHasPermissionToTeam(*c.AppContext.Session(), gmConversionRequest.TeamID, model.PermissionCreatePrivateChannel) {
+		c.SetPermissionError(model.PermissionCreatePrivateChannel)
+		return
+	}
+
+	// The channel id the payload must be the same one as indicated in the URL.
+	if gmConversionRequest.ChannelID != c.Params.ChannelId {
+		c.SetInvalidParam("channel_id")
+		return
+	}
+
+	auditRec := c.MakeAuditRecord("convertGroupMessageToChannel", audit.Fail)
+	defer c.LogAuditRec(auditRec)
+	audit.AddEventParameter(auditRec, "channel_id", gmConversionRequest.ChannelID)
+	audit.AddEventParameter(auditRec, "team_id", gmConversionRequest.TeamID)
+	audit.AddEventParameter(auditRec, "user_id", user.Id)
+
+	updatedChannel, appErr := c.App.ConvertGroupMessageToChannel(c.AppContext, c.AppContext.Session().UserId, gmConversionRequest)
+	if appErr != nil {
+		c.Err = appErr
+		return
+	}
+
+	auditRec.Success()
+	if err := json.NewEncoder(w).Encode(updatedChannel); err != nil {
+		c.Logger.Warn("Error while writing response from convertGroupMessageToChannel", mlog.Err(err))
+	}
+}