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ApolloServer.ts
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ApolloServer.ts
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import lambda from 'aws-lambda';
import { ApolloServerBase } from 'apollo-server-core';
import { GraphQLOptions, Config } from 'apollo-server-core';
import {
renderPlaygroundPage,
RenderPageOptions as PlaygroundRenderPageOptions,
} from '@apollographql/graphql-playground-html';
import { graphqlLambda } from './lambdaApollo';
export interface CreateHandlerOptions {
cors?: {
origin?: boolean | string | string[];
methods?: string | string[];
allowedHeaders?: string | string[];
exposedHeaders?: string | string[];
credentials?: boolean;
maxAge?: number;
};
}
export class ApolloServer extends ApolloServerBase {
// If you feel tempted to add an option to this constructor. Please consider
// another place, since the documentation becomes much more complicated when
// the constructor is not longer shared between all integration
constructor(options: Config) {
if (process.env.ENGINE_API_KEY || options.engine) {
options.engine = {
sendReportsImmediately: true,
...(typeof options.engine !== 'boolean' ? options.engine : {}),
};
}
super(options);
}
// 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
createGraphQLServerOptions(
event: lambda.APIGatewayProxyEvent,
context: lambda.Context,
): Promise<GraphQLOptions> {
return super.graphQLServerOptions({ event, context });
}
public createHandler({ cors }: CreateHandlerOptions = { cors: undefined }) {
// We will kick off the `willStart` event once for the server, and then
// await it before processing any requests by incorporating its `await` into
// the GraphQLServerOptions function which is called before each request.
const promiseWillStart = this.willStart();
const corsHeaders: lambda.APIGatewayProxyResult['headers'] = {};
if (cors) {
if (cors.methods) {
if (typeof cors.methods === 'string') {
corsHeaders['Access-Control-Allow-Methods'] = cors.methods;
} else if (Array.isArray(cors.methods)) {
corsHeaders['Access-Control-Allow-Methods'] = cors.methods.join(',');
}
}
if (cors.allowedHeaders) {
if (typeof cors.allowedHeaders === 'string') {
corsHeaders['Access-Control-Allow-Headers'] = cors.allowedHeaders;
} else if (Array.isArray(cors.allowedHeaders)) {
corsHeaders[
'Access-Control-Allow-Headers'
] = cors.allowedHeaders.join(',');
}
}
if (cors.exposedHeaders) {
if (typeof cors.exposedHeaders === 'string') {
corsHeaders['Access-Control-Expose-Headers'] = cors.exposedHeaders;
} else if (Array.isArray(cors.exposedHeaders)) {
corsHeaders[
'Access-Control-Expose-Headers'
] = cors.exposedHeaders.join(',');
}
}
if (cors.credentials) {
corsHeaders['Access-Control-Allow-Credentials'] = 'true';
}
if (cors.maxAge) {
corsHeaders['Access-Control-Max-Age'] = cors.maxAge;
}
}
return (
event: lambda.APIGatewayProxyEvent,
context: lambda.Context,
callback: lambda.APIGatewayProxyCallback,
) => {
if (cors && cors.origin) {
if (typeof cors.origin === 'string') {
corsHeaders['Access-Control-Allow-Origin'] = cors.origin;
} else if (
typeof cors.origin === 'boolean' ||
(Array.isArray(cors.origin) &&
cors.origin.includes(
event.headers['Origin'] || event.headers['origin'],
))
) {
corsHeaders['Access-Control-Allow-Origin'] =
event.headers['Origin'] || event.headers['origin'];
}
if (!cors.allowedHeaders) {
corsHeaders['Access-Control-Allow-Headers'] =
event.headers['Access-Control-Request-Headers'];
}
}
if (event.httpMethod === 'OPTIONS') {
return callback(null, {
body: '',
statusCode: 204,
headers: corsHeaders,
});
}
if (this.playgroundOptions && event.httpMethod === 'GET') {
const acceptHeader = event.headers['Accept'] || event.headers['accept'];
if (acceptHeader && acceptHeader.includes('text/html')) {
const path =
event.path ||
(event.requestContext && event.requestContext.path) ||
'/';
const playgroundRenderPageOptions: PlaygroundRenderPageOptions = {
endpoint: path,
...this.playgroundOptions,
};
return callback(null, {
body: renderPlaygroundPage(playgroundRenderPageOptions),
statusCode: 200,
headers: {
'Content-Type': 'text/html',
...corsHeaders,
},
});
}
}
const callbackFilter: lambda.APIGatewayProxyCallback = (
error,
result,
) => {
callback(
error,
result && {
...result,
headers: {
...result.headers,
...corsHeaders,
},
},
);
};
graphqlLambda(async () => {
// In a world where this `createHandler` was async, we might avoid this
// but since we don't want to introduce a breaking change to this API
// (by switching it to `async`), we'll leverage the
// `GraphQLServerOptions`, which are dynamically built on each request,
// to `await` the `promiseWillStart` which we kicked off at the top of
// this method to ensure that it runs to completion (which is part of
// its contract) prior to processing the request.
await promiseWillStart;
return this.createGraphQLServerOptions(event, context);
})(event, context, callbackFilter);
};
}
}