import { CanActivate, ExecutionContext } from '@nestjs/common'
import { HttpRequest } from 'aws-sdk'

import { extractBearerToken, isBlank } from '../utils'

export abstract class BearerAuthorizationGuard implements CanActivate {
  protected abstract checkToken(token: string, request?: HttpRequest): boolean

  canActivate(context: ExecutionContext): boolean | Promise<boolean> {
    const request = context.switchToHttp().getRequest()

    return this.validateRequest(request)
  }

  private validateRequest(request: HttpRequest): boolean {
    const token = extractBearerToken(request)

    if (isBlank(token)) return false

    return this.checkToken(token, request)
  }
}