MM-10182 & MM-10183: Adds channel scheme and team scheme API endpoint. (#8680)

* MM-10183: Adds channel scheme API endpoint.

MM-10182: Adds team scheme API endpoint.

MM-10182_3: Switch from scheme_id in path to body.

* MM-10182/MM-10183: Changes path from 'schemes' to 'scheme'.

* MM-10182: Fix merge error.

api4/team.go

@@ -20,6 +20,7 @@ const (
 func (api *API) InitTeam() {
 	api.BaseRoutes.Teams.Handle("", api.ApiSessionRequired(createTeam)).Methods("POST")
 	api.BaseRoutes.Teams.Handle("", api.ApiSessionRequired(getAllTeams)).Methods("GET")
+	api.BaseRoutes.Teams.Handle("/{team_id:[A-Za-z0-9]+}/scheme", api.ApiSessionRequired(updateTeamScheme)).Methods("PUT")
 	api.BaseRoutes.Teams.Handle("/search", api.ApiSessionRequired(searchTeams)).Methods("POST")
 	api.BaseRoutes.TeamsForUser.Handle("", api.ApiSessionRequired(getTeamsForUser)).Methods("GET")
 	api.BaseRoutes.TeamsForUser.Handle("/unread", api.ApiSessionRequired(getTeamsUnreadForUser)).Methods("GET")
@@ -833,3 +834,53 @@ func removeTeamIcon(c *Context, w http.ResponseWriter, r *http.Request) {
 	c.LogAudit("")
 	ReturnStatusOK(w)
 }
+
+func updateTeamScheme(c *Context, w http.ResponseWriter, r *http.Request) {
+	c.RequireTeamId()
+	if c.Err != nil {
+		return
+	}
+
+	schemeID := model.SchemeIDFromJson(r.Body)
+	if schemeID == nil || len(*schemeID) != 26 {
+		c.SetInvalidParam("scheme_id")
+		return
+	}
+
+	if c.App.License() == nil {
+		c.Err = model.NewAppError("Api4.UpdateTeamScheme", "api.team.update_team_scheme.license.error", nil, "", http.StatusNotImplemented)
+		return
+	}
+
+	if !c.App.SessionHasPermissionToTeam(c.Session, c.Params.TeamId, model.PERMISSION_MANAGE_SYSTEM) {
+		c.SetPermissionError(model.PERMISSION_MANAGE_SYSTEM)
+		return
+	}
+
+	scheme, err := c.App.GetScheme(*schemeID)
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	if scheme.Scope != model.SCHEME_SCOPE_TEAM {
+		c.Err = model.NewAppError("Api4.UpdateTeamScheme", "api.team.update_team_scheme.scheme_scope.error", nil, "", http.StatusBadRequest)
+		return
+	}
+
+	team, err := c.App.GetTeam(c.Params.TeamId)
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	team.SchemeId = &scheme.Id
+
+	_, err = c.App.UpdateTeamScheme(team)
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	ReturnStatusOK(w)
+}