77 lines
2.6 KiB
JavaScript
77 lines
2.6 KiB
JavaScript
'use strict';
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const defaultProcessRequest = require('./processRequest');
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/**
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* Creates [Express](https://expressjs.com) middleware that processes
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* [GraphQL multipart requests](https://github.com/jaydenseric/graphql-multipart-request-spec)
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* using [`processRequest`]{@link processRequest}, ignoring non-multipart
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* requests. It sets the request body to be
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* [similar to a conventional GraphQL POST request]{@link GraphQLOperation} for
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* following GraphQL middleware to consume.
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* @kind function
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* @name graphqlUploadExpress
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* @param {ProcessRequestOptions} options Middleware options. Any [`ProcessRequestOptions`]{@link ProcessRequestOptions} can be used.
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* @param {ProcessRequestFunction} [options.processRequest=processRequest] Used to process [GraphQL multipart requests](https://github.com/jaydenseric/graphql-multipart-request-spec).
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* @returns {Function} Express middleware.
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* @example <caption>Ways to `import`.</caption>
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* ```js
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* import { graphqlUploadExpress } from 'graphql-upload';
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* ```
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*
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* ```js
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* import graphqlUploadExpress from 'graphql-upload/public/graphqlUploadExpress.js';
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* ```
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* @example <caption>Ways to `require`.</caption>
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* ```js
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* const { graphqlUploadExpress } = require('graphql-upload');
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* ```
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*
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* ```js
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* const graphqlUploadExpress = require('graphql-upload/public/graphqlUploadExpress');
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* ```
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* @example <caption>Basic [`express-graphql`](https://npm.im/express-graphql) setup.</caption>
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* ```js
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* const express = require('express');
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* const graphqlHTTP = require('express-graphql');
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* const { graphqlUploadExpress } = require('graphql-upload');
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* const schema = require('./schema');
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*
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* express()
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* .use(
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* '/graphql',
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* graphqlUploadExpress({ maxFileSize: 10000000, maxFiles: 10 }),
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* graphqlHTTP({ schema })
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* )
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* .listen(3000);
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* ```
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*/
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module.exports = function graphqlUploadExpress({
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processRequest = defaultProcessRequest,
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...processRequestOptions
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} = {}) {
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return function graphqlUploadExpressMiddleware(request, response, next) {
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if (!request.is('multipart/form-data')) return next();
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const finished = new Promise((resolve) => request.on('end', resolve));
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const { send } = response;
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response.send = (...args) => {
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finished.then(() => {
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response.send = send;
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response.send(...args);
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});
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};
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processRequest(request, response, processRequestOptions)
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.then((body) => {
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request.body = body;
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next();
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})
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.catch((error) => {
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if (error.status && error.expose) response.status(error.status);
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next(error);
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});
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};
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};
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