serverless-offline/src/events/http/lambda-events/LambdaIntegrationEvent.js

Emulate AWS λ and API Gateway locally when developing your Serverless project

import { env } from "node:process"
import { log } from "../../../utils/log.js"
import renderVelocityTemplateObject from "./renderVelocityTemplateObject.js"
import VelocityContext from "./VelocityContext.js"

const { parse } = JSON

export default class LambdaIntegrationEvent {
  #path = null

  #request = null

  #requestTemplate = null

  #stage = null

  constructor(request, stage, requestTemplate, path) {
    this.#path = path
    this.#request = request
    this.#requestTemplate = requestTemplate
    this.#stage = stage
  }

  create() {
    if (env.AUTHORIZER) {
      try {
        const authorizerContext = parse(env.AUTHORIZER)
        if (authorizerContext) {
          this.#request.auth = {
            ...this.#request.auth,
            credentials: {
              authorizer: authorizerContext,
            },
          }
        }
      } catch {
        log.error(
          "Could not parse process.env.AUTHORIZER, make sure it is correct JSON",
        )
      }
    }

    const velocityContext = new VelocityContext(
      this.#request,
      this.#stage,
      this.#request.payload || {},
      this.#path,
    ).getContext()

    const event = renderVelocityTemplateObject(
      this.#requestTemplate,
      velocityContext,
    )

    return event
  }
}