/
ApolloServer.ts
146 lines (131 loc) 路 4.51 KB
/
ApolloServer.ts
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import { Context, HttpRequest } from '@azure/functions';
import { HttpResponse } from 'azure-functions-ts-essentials';
import { ApolloServerBase } from 'apollo-server-core';
import { GraphQLOptions } from 'apollo-server-core';
import {
renderPlaygroundPage,
RenderPageOptions as PlaygroundRenderPageOptions,
} from '@apollographql/graphql-playground-html';
import { graphqlAzureFunction } from './azureFunctionApollo';
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 {
protected serverlessFramework(): boolean {
return true;
}
// 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(
request: HttpRequest,
context: Context,
): Promise<GraphQLOptions> {
return super.graphQLServerOptions({ request, context });
}
public createHandler({ cors }: CreateHandlerOptions = { cors: undefined }) {
const corsHeaders: HttpResponse['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 (context: Context, req: HttpRequest) => {
const originHeader = req.headers['Origin'] || req.headers['origin'];
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) &&
originHeader !== undefined &&
cors.origin.includes(originHeader))
) {
corsHeaders['Access-Control-Allow-Origin'] = originHeader;
}
if (!cors.allowedHeaders) {
corsHeaders['Access-Control-Allow-Headers'] =
req.headers['Access-Control-Request-Headers'];
}
}
if (req.method === 'OPTIONS') {
context.done(null, {
body: '',
status: 204,
headers: corsHeaders,
});
return;
}
if (this.playgroundOptions && req.method === 'GET') {
const acceptHeader = req.headers['Accept'] || req.headers['accept'];
if (acceptHeader && acceptHeader.includes('text/html')) {
const path = req.url || '/';
const playgroundRenderPageOptions: PlaygroundRenderPageOptions = {
endpoint: path,
...this.playgroundOptions,
};
const body = renderPlaygroundPage(playgroundRenderPageOptions);
context.done(null, {
body: body,
status: 200,
headers: {
'Content-Type': 'text/html',
...corsHeaders,
},
});
return;
}
}
const callbackFilter = (error?: any, output?: HttpResponse) => {
context.done(
error,
output && {
...output,
headers: {
...output.headers,
...corsHeaders,
},
},
);
};
graphqlAzureFunction(async () => {
return this.createGraphQLServerOptions(req, context);
})(context, req, callbackFilter);
};
}
}