1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283
import type { CorsOptions, CorsOptionsDelegate } from "./types.ts";import { Cors } from "./cors.ts";
interface Req {  method: string;  headers: {    get(headerKey: string): string | null | undefined;  };}
interface Res {  status?: number | string;  headers: {    get(headerKey: string): string | null | undefined;    set(headerKey: string, headerValue: string): any;  };}
/** * oakCors middleware wrapper * @param o CorsOptions | CorsOptionsDelegate * @link https://github.com/tajpouria/cors/blob/master/README.md#cors */export const oakCors = <  RequestT extends Req = any,  ResponseT extends Res = any,  MiddlewareT extends (    context: { request: RequestT; response: ResponseT },    next: (...args: any) => any,  ) => any = any,>(  o?: CorsOptions | CorsOptionsDelegate<RequestT>,) => {  const corsOptionsDelegate = Cors.produceCorsOptionsDelegate<    CorsOptionsDelegate<RequestT>  >(o);
  return (async ({ request, response }, next) => {    try {      const options = await corsOptionsDelegate(request);
      const corsOptions = Cors.produceCorsOptions(options || {});      const originDelegate = Cors.produceOriginDelegate(corsOptions);
      if (originDelegate) {        const requestMethod = request.method;        const getRequestHeader = (headerKey: string) =>          request.headers.get(headerKey);        const getResponseHeader = (headerKey: string) =>          response.headers.get(headerKey);        const setResponseHeader = (headerKey: string, headerValue: string) =>          response.headers.set(headerKey, headerValue);        const setStatus = (          statusCode: number,        ) => (response.status = statusCode);        const end = () => {};
        const origin = await originDelegate(getRequestHeader("origin"));
        if (!origin) next();        else {          corsOptions.origin = origin;
          return new Cors({            corsOptions,            requestMethod,            getRequestHeader,            getResponseHeader,            setResponseHeader,            setStatus,            next,            end,          }).configureHeaders();        }      }    } catch (error) {      console.error(error);    }
    next();  }) as MiddlewareT;};