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expressApollo.ts
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expressApollo.ts
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import * as express from 'express';
import * as url from 'url';
import { GraphQLOptions, HttpQueryError, runHttpQuery } from 'apollo-server-core';
import * as GraphiQL from 'apollo-server-module-graphiql';
export interface ExpressGraphQLOptionsFunction {
(req?: express.Request, res?: express.Response): GraphQLOptions | Promise<GraphQLOptions>;
}
// Design principles:
// - there is just one way allowed: POST request with JSON body. Nothing else.
// - simple, fast and secure
//
export interface ExpressHandler {
(req: express.Request, res: express.Response, next): void;
}
export function graphqlExpress(options: GraphQLOptions | ExpressGraphQLOptionsFunction): ExpressHandler {
if (!options) {
throw new Error('Apollo Server requires options.');
}
if (arguments.length > 1) {
// TODO: test this
throw new Error(`Apollo Server expects exactly one argument, got ${arguments.length}`);
}
return (req: express.Request, res: express.Response, next): void => {
runHttpQuery([req, res], {
method: req.method,
options: options,
query: req.method === 'POST' ? req.body : req.query,
}).then((gqlResponse) => {
res.setHeader('Content-Type', 'application/json');
res.write(gqlResponse);
res.end();
}, (error: HttpQueryError) => {
if ( 'HttpQueryError' !== error.name ) {
return next(error);
}
if ( error.headers ) {
Object.keys(error.headers).forEach((header) => {
res.setHeader(header, error.headers[header]);
});
}
res.statusCode = error.statusCode;
res.write(error.message);
res.end();
});
};
}
export interface ExpressGraphiQLOptionsFunction {
(req?: express.Request): GraphiQL.GraphiQLData | Promise<GraphiQL.GraphiQLData>;
}
/* This middleware returns the html for the GraphiQL interactive query UI
*
* GraphiQLData arguments
*
* - endpointURL: the relative or absolute URL for the endpoint which GraphiQL will make queries to
* - (optional) query: the GraphQL query to pre-fill in the GraphiQL UI
* - (optional) variables: a JS object of variables to pre-fill in the GraphiQL UI
* - (optional) operationName: the operationName to pre-fill in the GraphiQL UI
* - (optional) result: the result of the query to pre-fill in the GraphiQL UI
*/
export function graphiqlExpress(options: GraphiQL.GraphiQLData | ExpressGraphiQLOptionsFunction) {
return (req: express.Request, res: express.Response, next) => {
const query = req.url && url.parse(req.url, true).query;
GraphiQL.resolveGraphiQLString(query, options, req).then(graphiqlString => {
res.setHeader('Content-Type', 'text/html');
res.write(graphiqlString);
res.end();
}, error => next(error));
};
}