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// Copyright 2018-2020 the oak authors. All rights reserved. MIT license.
import { Application, State } from "./application.ts";import { Cookies } from "./cookies.ts";import { ServerRequest } from "./deps.ts";import { createHttpError } from "./httpError.ts";import { KeyStack } from "./keyStack.ts";import { Request } from "./request.ts";import { Response } from "./response.ts";import { ErrorStatus } from "./types.ts";
export class Context<S extends State = Record<string, any>> {  /** A reference to the current application */  app: Application<any>;
  /** The cookies object */  cookies: Cookies;
  /** The request object */  request: Request;
  /** The response object */  response: Response = new Response();
  /** The object to pass state to front-end views.  This can be typed by   * supplying the generic state argument when creating a new app.  For   * example:   *   *       const app = new Application<{ foo: string }>();   *    * Or can be contextually inferred based on setting an initial state object:   *    *       const app = new Application({ state: { foo: "bar" } });   *    */  state: S;
  constructor(app: Application<S>, serverRequest: ServerRequest) {    this.app = app;    this.state = app.state;    this.request = new Request(serverRequest);    this.cookies = new Cookies(this.request, this.response, {      keys: this.app.keys as KeyStack | undefined,      secure: this.request.secure,    });  }
  /** Asserts the condition and if the condition fails, creates an HTTP error   * with the provided status (which defaults to `500`).  The error status by    * default will be set on the `.response.status`.   */  assert(    condition: any,    errorStatus: ErrorStatus = 500,    message?: string,    props?: object,  ): asserts condition {    if (condition) {      return;    }    const err = createHttpError(errorStatus, message);    if (props) {      Object.assign(err, props);    }    throw err;  }
  /** Create and throw an HTTP Error, which can be used to pass status   * information which can be caught by other middleware to send more   * meaningful error messages back to the client.  The passed error status will   * be set on the `.response.status` by default as well.   */  throw(errorStatus: ErrorStatus, message?: string, props?: object): never {    const err = createHttpError(errorStatus, message);    if (props) {      Object.assign(err, props);    }    throw err;  }}