/
express.ts
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/
express.ts
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/**
* Copyright 2018 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file Add built in plug and play web framework support for express using body-parser
*/
import {Framework, StandardHandler} from './framework';
import {Request, Response} from 'express';
import * as common from '../common';
export interface ExpressHandler {
/** @public */
(request: Request, response: Response): void;
}
export interface ExpressMetadata {
/** @public */
request: Request;
/** @public */
response: Response;
}
/** @hidden */
export class Express implements Framework<ExpressHandler> {
handle(standard: StandardHandler) {
return (request: Request, response: Response) => {
const metadata: ExpressMetadata = {
request,
response,
};
standard(request.body, request.headers, {express: metadata})
.then(({status, body, headers}) => {
if (headers) {
for (const key in headers) {
response.setHeader(key, headers[key]!);
}
}
response.status(status).send(body);
})
.catch((e: Error) => {
common.error(e.stack || e);
response.status(500).send({error: e.message || e});
});
};
}
isResponse(second: {}): second is Response {
return typeof (second as Response).send === 'function';
}
isRequest(first: {}): first is Request {
return typeof (first as Request).get === 'function';
}
check(first: {}, second: {}) {
return this.isRequest(first) && this.isResponse(second);
}
}
/** @hidden */
export const express = new Express();