Guest accounts feature (#11428)

* MM-14139: Creating permissions for invite/promote/demote guests (#10778)

* MM-14139: Creating permissions for invite/promote/demote guests

* Fixing tests

* Adding invite guest api endpoint (#10792)

* Adding invite guest api endpoint

* Adding i18n

* Adding some tests

* WIP

* Migrating Token.Extra info to bigger size (2048)

* Fixing tests

* Adding client function for invite guests

* Adding send guests invites tests

* Renaming file from guest to guest_invite

* Adding Promote/Demote users from/to guest endpoints (#10791)

* Adding Promote/Demote users from/to guest endpoints

* Adding i18n translations

* Adding the client functions

* Using getQueryBuilder function

* Addressing PR review comments

* Adding default channels to users on promte from guest (#10851)

* Adding default channels to users on promte from guest

* Addressing PR review comments

* Fixing merge problems

* Sending websockets events on promote/demote (#11403)

* Sending websockets events on promote/demote

* Fixing merge problems

* Fixing govet shadowing problem

* Fixing feature branch tests

* Avoiding leaking users data through websockets for guest accounts (#11489)

* Avoiding leaking users data through websockets for guest accounts

* Adding tests and fixing code error

* Fixing i18n

* Allow to enable/disable guests and other extra config settings (#11481)

* Allow to enable/disable guests and other extra config settings

* Fixing tests and moving license and config validation to api level

* Update api4/role_test.go

Co-Authored-By: George Goldberg <george@gberg.me>

* Update api4/role_test.go

Co-Authored-By: George Goldberg <george@gberg.me>

* Fixing typo

* fixing tests

* Managing correctly the guest channel leave behavior (#11578)

* MM-15134: Removing guests from teams or system on leave channels if needed

* WIP

* No deactivating the guest user when leave the last team

* Adding a couple of tests

* Fixing shadow variables

* Fixing tests

* fixing tests

* fixing shadow variables

* Adding guest counts for channel stats (#11646)

* Adding guest counts for channel stats

* Adding tests

* Fixing tests

* Fixing guest domain restrictions (#11660)

* Adding needed migration for the database

* Fixing migration

api4/team.go

@@ -66,6 +66,7 @@ func (api *API) InitTeam() {
 	api.BaseRoutes.TeamMember.Handle("/schemeRoles", api.ApiSessionRequired(updateTeamMemberSchemeRoles)).Methods("PUT")
 	api.BaseRoutes.Team.Handle("/import", api.ApiSessionRequired(importTeam)).Methods("POST")
 	api.BaseRoutes.Team.Handle("/invite/email", api.ApiSessionRequired(inviteUsersToTeam)).Methods("POST")
+	api.BaseRoutes.Team.Handle("/invite-guests/email", api.ApiSessionRequired(inviteGuestsToChannels)).Methods("POST")
 	api.BaseRoutes.Teams.Handle("/invites/email", api.ApiSessionRequired(invalidateAllEmailInvites)).Methods("DELETE")
 	api.BaseRoutes.Teams.Handle("/invite/{invite_id:[A-Za-z0-9]+}", api.ApiHandler(getInviteInfo)).Methods("GET")
 
@@ -913,6 +914,42 @@ func inviteUsersToTeam(c *Context, w http.ResponseWriter, r *http.Request) {
 	ReturnStatusOK(w)
 }
 
+func inviteGuestsToChannels(c *Context, w http.ResponseWriter, r *http.Request) {
+	if c.App.License() == nil {
+		c.Err = model.NewAppError("Api4.InviteGuestsToChannels", "api.team.invate_guests_to_channels.license.error", nil, "", http.StatusNotImplemented)
+		return
+	}
+
+	if !*c.App.Config().GuestAccountsSettings.Enable {
+		c.Err = model.NewAppError("Api4.InviteGuestsToChannels", "api.team.invate_guests_to_channels.disabled.error", nil, "", http.StatusNotImplemented)
+		return
+	}
+
+	c.RequireTeamId()
+	if c.Err != nil {
+		return
+	}
+
+	if !c.App.SessionHasPermissionToTeam(c.App.Session, c.Params.TeamId, model.PERMISSION_INVITE_GUEST) {
+		c.SetPermissionError(model.PERMISSION_INVITE_GUEST)
+		return
+	}
+
+	guestsInvite := model.GuestsInviteFromJson(r.Body)
+	if err := guestsInvite.IsValid(); err != nil {
+		c.Err = err
+		return
+	}
+
+	err := c.App.InviteGuestsToChannels(c.Params.TeamId, guestsInvite, c.App.Session.UserId)
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	ReturnStatusOK(w)
+}
+
 func getInviteInfo(c *Context, w http.ResponseWriter, r *http.Request) {
 	c.RequireInviteId()
 	if c.Err != nil {