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/config.go

@@ -0,0 +1,44 @@
+// 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) registerConfigRoutes(r *mux.Router) {
+	// Config APIs
+	r.HandleFunc("/clientConfig", a.getClientConfig).Methods("GET")
+}
+
+func (a *API) getClientConfig(w http.ResponseWriter, r *http.Request) {
+	// swagger:operation GET /clientConfig getClientConfig
+	//
+	// Returns the client configuration
+	//
+	// ---
+	// produces:
+	// - application/json
+	// responses:
+	//   '200':
+	//     description: success
+	//     schema:
+	//       "$ref": "#/definitions/ClientConfig"
+	//   default:
+	//     description: internal error
+	//     schema:
+	//       "$ref": "#/definitions/ErrorResponse"
+
+	clientConfig := a.app.GetClientConfig()
+
+	configData, err := json.Marshal(clientConfig)
+	if err != nil {
+		a.errorResponse(w, r, err)
+		return
+	}
+	jsonBytesResponse(w, http.StatusOK, configData)
+}