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/wsapi/websocket_handler.go

@@ -0,0 +1,82 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package wsapi
+
+import (
+	"net/http"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app/platform"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/i18n"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+)
+
+func (api *API) APIWebSocketHandler(wh func(*model.WebSocketRequest) (map[string]any, *model.AppError)) webSocketHandler {
+	return webSocketHandler{api.App, wh}
+}
+
+type webSocketHandler struct {
+	app         *app.App
+	handlerFunc func(*model.WebSocketRequest) (map[string]any, *model.AppError)
+}
+
+func (wh webSocketHandler) ServeWebSocket(conn *platform.WebConn, r *model.WebSocketRequest) {
+	mlog.Debug("Websocket request", mlog.String("action", r.Action))
+
+	hub := wh.app.Srv().Platform().GetHubForUserId(conn.UserId)
+	if hub == nil {
+		return
+	}
+	session, sessionErr := wh.app.GetSession(conn.GetSessionToken())
+	defer wh.app.ReturnSessionToPool(session)
+
+	if sessionErr != nil {
+		mlog.Error(
+			"websocket session error",
+			mlog.String("action", r.Action),
+			mlog.Int64("seq", r.Seq),
+			mlog.String("user_id", conn.UserId),
+			mlog.String("error_message", sessionErr.SystemMessage(i18n.T)),
+			mlog.Err(sessionErr),
+		)
+		sessionErr.DetailedError = ""
+		errResp := model.NewWebSocketError(r.Seq, sessionErr)
+		hub.SendMessage(conn, errResp)
+		return
+	}
+
+	r.Session = *session
+	r.T = conn.T
+	r.Locale = conn.Locale
+
+	var data map[string]any
+	var err *model.AppError
+
+	if data, err = wh.handlerFunc(r); err != nil {
+		mlog.Error(
+			"websocket request handling error",
+			mlog.String("action", r.Action),
+			mlog.Int64("seq", r.Seq),
+			mlog.String("user_id", conn.UserId),
+			mlog.String("error_message", err.SystemMessage(i18n.T)),
+			mlog.Err(err),
+		)
+		err.DetailedError = ""
+		errResp := model.NewWebSocketError(r.Seq, err)
+		hub.SendMessage(conn, errResp)
+		return
+	}
+
+	resp := model.NewWebSocketResponse(model.StatusOk, r.Seq, data)
+	hub.SendMessage(conn, resp)
+}
+
+func NewInvalidWebSocketParamError(action string, name string) *model.AppError {
+	return model.NewAppError("websocket: "+action, "api.websocket_handler.invalid_param.app_error", map[string]any{"Name": name}, "", http.StatusBadRequest)
+}
+
+func NewServerBusyWebSocketError(action string) *model.AppError {
+	return model.NewAppError("websocket: "+action, "api.websocket_handler.server_busy.app_error", nil, "", http.StatusServiceUnavailable)
+}