Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/api4/notify_admin.go

@@ -0,0 +1,57 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package api4
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+)
+
+func handleNotifyAdmin(c *Context, w http.ResponseWriter, r *http.Request) {
+	var notifyAdminRequest *model.NotifyAdminToUpgradeRequest
+	err := json.NewDecoder(r.Body).Decode(&notifyAdminRequest)
+	if err != nil {
+		c.SetInvalidParamWithErr("notifyAdminRequest", err)
+		return
+	}
+
+	userId := c.AppContext.Session().UserId
+	appErr := c.App.SaveAdminNotification(userId, notifyAdminRequest)
+	if appErr != nil {
+		c.Err = appErr
+		return
+	}
+
+	ReturnStatusOK(w)
+}
+
+func handleTriggerNotifyAdminPosts(c *Context, w http.ResponseWriter, r *http.Request) {
+	if !*c.App.Config().ServiceSettings.EnableAPITriggerAdminNotifications {
+		c.Err = model.NewAppError("Api4.handleTriggerNotifyAdminPosts", "api.cloud.app_error", nil, "Manual triggering of notifications not allowed", http.StatusForbidden)
+		return
+	}
+
+	var notifyAdminRequest *model.NotifyAdminToUpgradeRequest
+	err := json.NewDecoder(r.Body).Decode(&notifyAdminRequest)
+	if err != nil {
+		c.SetInvalidParamWithErr("notifyAdminRequest", err)
+		return
+	}
+
+	// only system admins can manually trigger these notifications
+	if !c.App.SessionHasPermissionTo(*c.AppContext.Session(), model.PermissionManageSystem) {
+		c.SetPermissionError(model.PermissionManageSystem)
+		return
+	}
+
+	appErr := c.App.SendNotifyAdminPosts(c.AppContext, "", "", notifyAdminRequest.TrialNotification)
+	if appErr != nil {
+		c.Err = appErr
+		return
+	}
+
+	ReturnStatusOK(w)
+}