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/boards/api/system.go

@@ -0,0 +1,60 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/gorilla/mux"
+)
+
+func (a *API) registerSystemRoutes(r *mux.Router) {
+	// System APIs
+	r.HandleFunc("/hello", a.handleHello).Methods("GET")
+	r.HandleFunc("/ping", a.handlePing).Methods("GET")
+}
+
+func (a *API) handleHello(w http.ResponseWriter, r *http.Request) {
+	// swagger:operation GET /hello hello
+	//
+	// Responds with `Hello` if the web service is running.
+	//
+	// ---
+	// produces:
+	// - text/plain
+	// responses:
+	//   '200':
+	//     description: success
+	stringResponse(w, "Hello")
+}
+
+func (a *API) handlePing(w http.ResponseWriter, r *http.Request) {
+	// swagger:operation GET /ping ping
+	//
+	// Responds with server metadata if the web service is running.
+	//
+	// ---
+	// produces:
+	// - application/json
+	// responses:
+	//   '200':
+	//     description: success
+	serverMetadata := a.app.GetServerMetadata()
+
+	if a.singleUserToken != "" {
+		serverMetadata.SKU = "personal_desktop"
+	}
+
+	if serverMetadata.Edition == "plugin" {
+		serverMetadata.SKU = "suite"
+	}
+
+	bytes, err := json.Marshal(serverMetadata)
+	if err != nil {
+		a.errorResponse(w, r, err)
+	}
+
+	jsonStringResponse(w, 200, string(bytes))
+}