@scloud/lambda-api
Version:
Lambda handler for API Gateway proxy requests
80 lines • 10.2 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.apiHandler = apiHandler;
const helpers_1 = require("./helpers");
function textResponse(statusCode, body) {
return {
statusCode,
headers: { 'Content-Type': 'text/plain' },
body
};
}
/**
* API route handler
*/
async function apiHandler(event, context, routes = {
'/api/ping': { GET: async (request) => ({ statusCode: 200, body: request }) },
}, errorHandler = async (request) => ({ statusCode: 500, body: { error: `Internal server error: ${request.path}` } }), catchAll = async (request) => textResponse(404, `Not found: ${request.path}`), contextBuilder) {
console.log(`Executing ${context.functionName} version: ${process.env.COMMIT_HASH}`);
const request = (0, helpers_1.parseRequest)(event);
let response;
try {
const match = (0, helpers_1.matchRoute)(routes, request.path);
if (!match.route) {
// Catch-all / 404
response = await catchAll(request);
}
else {
const handlerFunction = match.route[request.method];
// Handle the request:
if (handlerFunction) {
if (contextBuilder)
await contextBuilder(request);
response = await handlerFunction({ ...request, pathParameters: match.params });
}
else {
response = textResponse(405, 'Method not allowed');
}
}
}
catch (e) {
// Fallback error handling
console.error(`${e.message}\n${e.stack}`);
response = textResponse(500, `Internal server error: ${request.path}`);
try {
// Error handling
if (errorHandler)
response = await errorHandler(request, e);
}
catch (ee) {
console.error(`Error in error handler: ${ee.message}\n${ee.stack}`);
}
}
// API Gateway Proxy result
let body = '';
if (typeof response.body === 'string') {
// Use the body as-is
// Potentially add a text/plain content type header:
response.headers = { 'Content-Type': 'text/plain', ...response.headers };
body = response.body;
}
else if (response.body) {
// Stringify the response object
// API Gateway returns application/json by default
body = JSON.stringify(response.body);
}
const result = {
statusCode: response.statusCode,
body,
headers: response.headers,
};
// Cookies (if set)
const cookieHeaders = (0, helpers_1.buildCookie)(response.cookies);
if (cookieHeaders) {
result.multiValueHeaders = {
'Set-Cookie': cookieHeaders,
};
}
return result;
}
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