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ApolloServer.ts
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ApolloServer.ts
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import * as express from 'express';
import * as corsMiddleware from 'cors';
import { json, OptionsJson } from 'body-parser';
import {
renderPlaygroundPage,
RenderPageOptions as PlaygroundRenderPageOptions,
} from '@apollographql/graphql-playground-html';
import {
GraphQLOptions,
FileUploadOptions,
ApolloServerBase,
formatApolloErrors,
} from 'apollo-server-core';
import * as accepts from 'accepts';
import * as typeis from 'type-is';
import { graphqlExpress } from './expressApollo';
import { processRequest as processFileUploads } from '@apollographql/apollo-upload-server';
export { GraphQLOptions, GraphQLExtension } from 'apollo-server-core';
export interface ServerRegistration {
// Note: You can also pass a connect.Server here. If we changed this field to
// `express.Application | connect.Server`, it would be very hard to get the
// app.use calls to typecheck even though they do work properly. Our
// assumption is that very few people use connect with TypeScript (and in fact
// we suspect the only connect users left writing GraphQL apps are Meteor
// users).
app: express.Application;
path?: string;
cors?: corsMiddleware.CorsOptions | boolean;
bodyParserConfig?: OptionsJson | boolean;
onHealthCheck?: (req: express.Request) => Promise<any>;
disableHealthCheck?: boolean;
}
const fileUploadMiddleware = (
uploadsConfig: FileUploadOptions,
server: ApolloServerBase,
) => (
req: express.Request,
res: express.Response,
next: express.NextFunction,
) => {
// Note: we use typeis directly instead of via req.is for connect support.
if (typeis(req, ['multipart/form-data'])) {
processFileUploads(req, uploadsConfig)
.then(body => {
req.body = body;
next();
})
.catch(error => {
if (error.status && error.expose) res.status(error.status);
next(
formatApolloErrors([error], {
formatter: server.requestOptions.formatError,
debug: server.requestOptions.debug,
}),
);
});
} else {
next();
}
};
export class ApolloServer extends ApolloServerBase {
// This translates the arguments from the middleware into graphQL options It
// provides typings for the integration specific behavior, ideally this would
// be propagated with a generic to the super class
async createGraphQLServerOptions(
req: express.Request,
res: express.Response,
): Promise<GraphQLOptions> {
return super.graphQLServerOptions({ req, res });
}
protected supportsSubscriptions(): boolean {
return true;
}
protected supportsUploads(): boolean {
return true;
}
public applyMiddleware({
app,
path,
cors,
bodyParserConfig,
disableHealthCheck,
onHealthCheck,
}: ServerRegistration) {
if (!path) path = '/graphql';
if (!disableHealthCheck) {
// uses same path as engine proxy, but is generally useful.
app.use('/.well-known/apollo/server-health', (req, res) => {
// Response follows https://tools.ietf.org/html/draft-inadarei-api-health-check-01
res.type('application/health+json');
if (onHealthCheck) {
onHealthCheck(req)
.then(() => {
res.json({ status: 'pass' });
})
.catch(() => {
res.status(503).json({ status: 'fail' });
});
} else {
res.json({ status: 'pass' });
}
});
}
let uploadsMiddleware;
if (this.uploadsConfig) {
uploadsMiddleware = fileUploadMiddleware(this.uploadsConfig, this);
}
// XXX multiple paths?
this.graphqlPath = path;
// Note that we don't just pass all of these handlers to a single app.use call
// for 'connect' compatibility.
if (cors === true) {
app.use(path, corsMiddleware());
} else if (cors !== false) {
app.use(path, corsMiddleware(cors));
}
if (bodyParserConfig === true) {
app.use(path, json());
} else if (bodyParserConfig !== false) {
app.use(path, json(bodyParserConfig));
}
if (uploadsMiddleware) {
app.use(path, uploadsMiddleware);
}
// Note: if you enable playground in production and expect to be able to see your
// schema, you'll need to manually specify `introspection: true` in the
// ApolloServer constructor; by default, the introspection query is only
// enabled in dev.
app.use(path, (req, res, next) => {
if (this.playgroundOptions && req.method === 'GET') {
// perform more expensive content-type check only if necessary
// XXX We could potentially move this logic into the GuiOptions lambda,
// but I don't think it needs any overriding
const accept = accepts(req);
const types = accept.types() as string[];
const prefersHTML =
types.find(
(x: string) => x === 'text/html' || x === 'application/json',
) === 'text/html';
if (prefersHTML) {
const playgroundRenderPageOptions: PlaygroundRenderPageOptions = {
endpoint: path,
subscriptionEndpoint: this.subscriptionsPath,
...this.playgroundOptions,
};
res.setHeader('Content-Type', 'text/html');
const playground = renderPlaygroundPage(playgroundRenderPageOptions);
res.write(playground);
res.end();
return;
}
}
return graphqlExpress(this.createGraphQLServerOptions.bind(this))(
req,
res,
next,
);
});
}
}
export const registerServer = () => {
throw new Error(
'Please use server.applyMiddleware instead of registerServer. This warning will be removed in the next release',
);
};