email-writer.middleware.ts

import { Logger, ForbiddenException, NestMiddleware, Injectable, UnauthorizedException } from '@nestjs/common';
import { ConfigService } from '../configuration/config.service';

@Injectable()
export class EmailWriterMiddleware implements NestMiddleware {

  constructor(private configService: ConfigService) {
  }

  resolve() {
    return (req, res, next) => {
      Logger.log('[-] Untokenise middleware called');

      const groupHeaderName = this.configService.config.groupHeader;
      if (req.headers[groupHeaderName]) {
        let arr = req.headers[groupHeaderName].split(',');
        arr = arr.map(e => e.trim());
        const group = arr.find(e => e === this.configService.config.emailWriterGroupName);
        if (group === undefined) {
          throw new ForbiddenException('You can\'t access this ressource.');
        } else {
          next();
        }
      } else {
        throw new UnauthorizedException('You can\'t access this ressource.');
      }
    };
  }
}