refactor: null -> undefined where appropriate

[e-mobility-charging-stations-simulator.git] / src / charging-station / ocpp / 2.0 / OCPP20ResponseService.ts

// Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.

import type { JSONSchemaType } from 'ajv';

import { OCPP20ServiceUtils } from './OCPP20ServiceUtils';
import { type ChargingStation, addConfigurationKey } from '../../../charging-station';
import { OCPPError } from '../../../exception';
import {
  ErrorType,
  type JsonObject,
  type JsonType,
  type OCPP20BootNotificationResponse,
  type OCPP20ClearCacheResponse,
  type OCPP20HeartbeatResponse,
  OCPP20IncomingRequestCommand,
  OCPP20OptionalVariableName,
  OCPP20RequestCommand,
  type OCPP20StatusNotificationResponse,
  OCPPVersion,
  RegistrationStatusEnumType,
  type ResponseHandler,
} from '../../../types';
import { logger } from '../../../utils';
import { OCPPResponseService } from '../OCPPResponseService';

const moduleName = 'OCPP20ResponseService';

export class OCPP20ResponseService extends OCPPResponseService {
  public jsonIncomingRequestResponseSchemas: Map<
    OCPP20IncomingRequestCommand,
    JSONSchemaType<JsonObject>
  >;

  private responseHandlers: Map<OCPP20RequestCommand, ResponseHandler>;
  private jsonSchemas: Map<OCPP20RequestCommand, JSONSchemaType<JsonObject>>;

  public constructor() {
    // if (new.target?.name === moduleName) {
    //   throw new TypeError(`Cannot construct ${new.target?.name} instances directly`);
    // }
    super(OCPPVersion.VERSION_20);
    this.responseHandlers = new Map<OCPP20RequestCommand, ResponseHandler>([
      [
        OCPP20RequestCommand.BOOT_NOTIFICATION,
        this.handleResponseBootNotification.bind(this) as ResponseHandler,
      ],
      [OCPP20RequestCommand.HEARTBEAT, this.emptyResponseHandler.bind(this) as ResponseHandler],
      [
        OCPP20RequestCommand.STATUS_NOTIFICATION,
        this.emptyResponseHandler.bind(this) as ResponseHandler,
      ],
    ]);
    this.jsonSchemas = new Map<OCPP20RequestCommand, JSONSchemaType<JsonObject>>([
      [
        OCPP20RequestCommand.BOOT_NOTIFICATION,
        OCPP20ServiceUtils.parseJsonSchemaFile<OCPP20BootNotificationResponse>(
          'assets/json-schemas/ocpp/2.0/BootNotificationResponse.json',
          moduleName,
          'constructor',
        ),
      ],
      [
        OCPP20RequestCommand.HEARTBEAT,
        OCPP20ServiceUtils.parseJsonSchemaFile<OCPP20HeartbeatResponse>(
          'assets/json-schemas/ocpp/2.0/HeartbeatResponse.json',
          moduleName,
          'constructor',
        ),
      ],
      [
        OCPP20RequestCommand.STATUS_NOTIFICATION,
        OCPP20ServiceUtils.parseJsonSchemaFile<OCPP20StatusNotificationResponse>(
          'assets/json-schemas/ocpp/2.0/StatusNotificationResponse.json',
          moduleName,
          'constructor',
        ),
      ],
    ]);
    this.jsonIncomingRequestResponseSchemas = new Map([
      [
        OCPP20IncomingRequestCommand.CLEAR_CACHE,
        OCPP20ServiceUtils.parseJsonSchemaFile<OCPP20ClearCacheResponse>(
          'assets/json-schemas/ocpp/2.0/ClearCacheResponse.json',
          moduleName,
          'constructor',
        ),
      ],
    ]);
    this.validatePayload = this.validatePayload.bind(this) as (
      chargingStation: ChargingStation,
      commandName: OCPP20RequestCommand,
      payload: JsonType,
    ) => boolean;
  }

  public async responseHandler<ReqType extends JsonType, ResType extends JsonType>(
    chargingStation: ChargingStation,
    commandName: OCPP20RequestCommand,
    payload: ResType,
    requestPayload: ReqType,
  ): Promise<void> {
    if (
      chargingStation.isRegistered() === true ||
      commandName === OCPP20RequestCommand.BOOT_NOTIFICATION
    ) {
      if (
        this.responseHandlers.has(commandName) === true &&
        OCPP20ServiceUtils.isRequestCommandSupported(chargingStation, commandName) === true
      ) {
        try {
          this.validatePayload(chargingStation, commandName, payload);
          await this.responseHandlers.get(commandName)!(chargingStation, payload, requestPayload);
        } catch (error) {
          logger.error(
            `${chargingStation.logPrefix()} ${moduleName}.responseHandler: Handle response error:`,
            error,
          );
          throw error;
        }
      } else {
        // Throw exception
        throw new OCPPError(
          ErrorType.NOT_IMPLEMENTED,
          `${commandName} is not implemented to handle response PDU ${JSON.stringify(
            payload,
            undefined,
            2,
          )}`,
          commandName,
          payload,
        );
      }
    } else {
      throw new OCPPError(
        ErrorType.SECURITY_ERROR,
        `${commandName} cannot be issued to handle response PDU ${JSON.stringify(
          payload,
          undefined,
          2,
        )} while the charging station is not registered on the central server.`,
        commandName,
        payload,
      );
    }
  }

  private validatePayload(
    chargingStation: ChargingStation,
    commandName: OCPP20RequestCommand,
    payload: JsonType,
  ): boolean {
    if (this.jsonSchemas.has(commandName) === true) {
      return this.validateResponsePayload(
        chargingStation,
        commandName,
        this.jsonSchemas.get(commandName)!,
        payload,
      );
    }
    logger.warn(
      `${chargingStation.logPrefix()} ${moduleName}.validatePayload: No JSON schema found for command '${commandName}' PDU validation`,
    );
    return false;
  }

  private handleResponseBootNotification(
    chargingStation: ChargingStation,
    payload: OCPP20BootNotificationResponse,
  ): void {
    if (payload.status === RegistrationStatusEnumType.ACCEPTED) {
      addConfigurationKey(
        chargingStation,
        OCPP20OptionalVariableName.HeartbeatInterval,
        payload.interval.toString(),
        {},
        { overwrite: true, save: true },
      );
      OCPP20ServiceUtils.startHeartbeatInterval(chargingStation, payload.interval);
    }
    if (Object.values(RegistrationStatusEnumType).includes(payload.status)) {
      const logMsg = `${chargingStation.logPrefix()} Charging station in '${
        payload.status
      }' state on the central server`;
      payload.status === RegistrationStatusEnumType.REJECTED
        ? logger.warn(logMsg)
        : logger.info(logMsg);
    } else {
      logger.error(
        `${chargingStation.logPrefix()} Charging station boot notification response received: %j with undefined registration status`,
        payload,
      );
    }
  }
}