@fanoutio/apollo-server-lambda-grip/build-esm/aws-lambda-adapters.js

Apollo Server that runs on AWS Lambda API Gateway and GRIP to pump subscriptions

import http from "http";
export function httpFromApiGatewayEvent(event) {
    const lowerHeaders = {};
    for (const [key, value] of Object.entries(event.headers)) {
        lowerHeaders[key.toLowerCase()] = value;
    }
    const req = {
        headers: lowerHeaders,
        method: event.httpMethod,
        body: event.body,
    };
    const res = new http.ServerResponse(req);
    const chunks = [];
    const resWrite = res.write;
    // @ts-ignore
    res.write = (chunk, encoding, callback) => {
        let encodingWasGiven = false;
        if (typeof encoding === 'string') {
            // assume this was called like this:
            // write(chunk, encoding[, callback])
            encodingWasGiven = true;
        }
        else {
            // this was called like this:
            // write(chunk[, callback)
            callback = encoding;
            encoding = 'utf8';
        }
        if (chunk instanceof Buffer) {
            chunks.push(chunk);
        }
        else {
            chunks.push(Buffer.from(chunk, encoding));
        }
        if (encodingWasGiven) {
            // @ts-ignore
            resWrite.call(res, chunk, encoding, callback);
        }
        else {
            // @ts-ignore
            resWrite.call(res, chunk, callback);
        }
    };
    res.getHeadersAsObject = () => {
        const headersString = res['_header'];
        const headers = {};
        for (const kv of headersString.split('\r\n')) {
            const pos = kv.indexOf(':');
            if (pos === -1) {
                continue;
            }
            const key = kv.slice(0, pos);
            const value = kv.slice(pos + 1).trim();
            if (value == null || value === '') {
                continue;
            }
            headers[key] = value;
        }
        // Transfer-Encoding: chunked gets added automatically, but
        // this is not valid under AWS lambda
        delete headers['Transfer-Encoding'];
        return headers;
    };
    res.getBodyAsBuffer = () => {
        return Buffer.concat(chunks);
    };
    return {
        req,
        res,
    };
}
export function apiGatewayResponseFromHttp(res) {
    var _a, _b, _c;
    const gatewayRes = res;
    const headers = (_a = gatewayRes.getHeadersAsObject) === null || _a === void 0 ? void 0 : _a.call(gatewayRes);
    const body = (_c = (_b = gatewayRes.getBodyAsBuffer) === null || _b === void 0 ? void 0 : _b.call(gatewayRes).toString('utf8')) !== null && _c !== void 0 ? _c : '';
    const response = {
        statusCode: res.statusCode,
        headers,
        body,
        isBase64Encoded: false,
    };
    return response;
}
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