@scloud/lambda-local
Version:
Run typical Lambda handlers locally.
117 lines • 17.5 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.cloudfrontLocal = cloudfrontLocal;
const express_1 = __importDefault(require("express"));
function cloudfrontLocal(cloudfrontPathMappings, debug = false) {
const port = +(process.env.port || '3000');
const app = (0, express_1.default)();
// https://stackoverflow.com/questions/12345166/how-to-force-parse-request-body-as-plain-text-instead-of-json-in-express
app.use(express_1.default.text({ type: '*/*' }));
app.all('/*', async (req, res) => {
// const url = new URL(req.originalUrl, 'https://example.com');
// Headers - NB it seems that in Lambda multiValueHeaders always contains the values from headers
const headers = {};
const multiValueHeaders = {};
Object.keys(req.headers).forEach((header) => {
if (req.headers[header] === undefined) {
headers[header] = undefined;
multiValueHeaders[header] = undefined;
}
if (typeof req.headers[header] === 'string') {
headers[header] = req.headers[header];
multiValueHeaders[header] = [req.headers[header]];
}
if (Array.isArray(req.headers[header])) {
multiValueHeaders[header] = req.headers[header];
}
});
// Query string - basic translation
const queryStringParameters = {};
const multiValueQueryStringParameters = {};
Object.keys(req.query).forEach((parameter) => {
queryStringParameters[parameter] = undefined;
if (typeof req.query[parameter] === 'string')
queryStringParameters[parameter] = req.query[parameter];
if (Array.isArray(req.query[parameter]))
multiValueQueryStringParameters[parameter] = req.query[parameter];
});
const event = {
body: typeof req.body === 'string' ? req.body : JSON.stringify(req.body),
headers,
multiValueHeaders,
httpMethod: req.method,
path: req.path,
queryStringParameters,
multiValueQueryStringParameters,
requestContext: {
httpMethod: req.method,
path: req.path,
protocol: req.protocol,
},
};
if (debug) {
// Print out the event that will be sent to the handler
console.log('Event:');
console.log(event.httpMethod, event.path);
console.log(JSON.stringify(event, null, 2));
}
try {
const paths = Object.keys(cloudfrontPathMappings);
// Try a simple mapping
let handler = cloudfrontPathMappings[event.path];
// Fall back to a '*' match:
paths.forEach((path) => {
let partialMatch = path;
// Strip leading slash:
if (partialMatch.startsWith('/')) {
partialMatch = path.slice(1);
}
// Remove trailing '*' wildcard:
if (partialMatch.endsWith('*')) {
partialMatch = path.slice(0, -1);
}
// Get the first match:
const candidate = event.path.startsWith(partialMatch) ? cloudfrontPathMappings[path] : undefined;
handler = handler || candidate;
});
// Invoke the function handler:
const result = handler ? await handler(event, {}) : { statusCode: 404, body: `Path not matched: ${event.path} (${paths})` };
// Print out the response if successful
if (debug) {
console.log('Result:');
console.log(event.httpMethod, event.path, result.statusCode);
console.log(JSON.stringify(result, null, 2));
}
// Send the response
res.status(result.statusCode);
if (result.multiValueHeaders) {
for (const key of Object.keys(result.multiValueHeaders)) {
res.set(key, result.multiValueHeaders[key].map((value) => `${value}`));
}
;
}
if (result.headers) {
for (const key of Object.keys(result.headers)) {
res.set(key, `${result.headers[key]}`);
}
;
}
// Body
res.send(result.body);
}
catch (e) {
// Log the error and send a 500 response
console.log(e);
console.log(e.stack);
res.status(500).send(`${e}`);
}
;
});
app.listen(port, () => {
console.log(`Lambda handler can be invoked at http://localhost:${port}`);
});
}
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express, { Request, Response } from 'express';\nimport { APIGatewayProxyEvent, APIGatewayProxyResult, Context } from 'aws-lambda';\n\nexport interface CloudfrontPathMappings {\n  [key: string]: (event: APIGatewayProxyEvent, context: Context) => Promise<APIGatewayProxyResult>;\n}\n\nexport function cloudfrontLocal(cloudfrontPathMappings: CloudfrontPathMappings, debug = false) {\n  const port = +(process.env.port || '3000');\n  const app = express();\n\n  // https://stackoverflow.com/questions/12345166/how-to-force-parse-request-body-as-plain-text-instead-of-json-in-express\n  app.use(express.text({ type: '*/*' }));\n\n  app.all('/*', async (req: Request, res: Response) => {\n    // const url = new URL(req.originalUrl, 'https://example.com');\n    // Headers - NB it seems that in Lambda multiValueHeaders always contains the values from headers\n    const headers: Record<string, string | undefined> = {};\n    const multiValueHeaders: Record<string, string[] | undefined> = {};\n    Object.keys(req.headers).forEach((header) => {\n      if (req.headers[header] === undefined) {\n        headers[header] = undefined;\n        multiValueHeaders[header] = undefined;\n      }\n      if (typeof req.headers[header] === 'string') {\n        headers[header] = req.headers[header] as string;\n        multiValueHeaders[header] = [req.headers[header] as string];\n      }\n      if (Array.isArray(req.headers[header])) {\n        multiValueHeaders[header] = req.headers[header] as string[];\n      }\n    });\n\n    // Query string - basic translation\n    const queryStringParameters: Record<string, string | undefined> = {};\n    const multiValueQueryStringParameters: Record<string, string[] | undefined> = {};\n    Object.keys(req.query).forEach((parameter) => {\n      queryStringParameters[parameter] = undefined;\n      if (typeof req.query[parameter] === 'string') queryStringParameters[parameter] = req.query[parameter] as string;\n      if (Array.isArray(req.query[parameter])) multiValueQueryStringParameters[parameter] = req.query[parameter] as string[];\n    });\n\n    const event: APIGatewayProxyEvent = {\n      body: typeof req.body === 'string' ? req.body : JSON.stringify(req.body),\n      headers,\n      multiValueHeaders,\n      httpMethod: req.method,\n      path: req.path,\n      queryStringParameters,\n      multiValueQueryStringParameters,\n      requestContext: {\n        httpMethod: req.method,\n        path: req.path,\n        protocol: req.protocol,\n      } as unknown as APIGatewayProxyEvent['requestContext'],\n    } as unknown as APIGatewayProxyEvent;\n\n    if (debug) {\n      // Print out the event that will be sent to the handler\n      console.log('Event:');\n      console.log(event.httpMethod, event.path);\n      console.log(JSON.stringify(event, null, 2));\n    }\n\n    try {\n      const paths = Object.keys(cloudfrontPathMappings);\n\n      // Try a simple mapping\n      let handler = cloudfrontPathMappings[event.path];\n\n      // Fall back to a '*' match:\n      paths.forEach((path) => {\n        let partialMatch = path;\n        // Strip leading slash:\n        if (partialMatch.startsWith('/')) {\n          partialMatch = path.slice(1);\n        }\n        // Remove trailing '*' wildcard:\n        if (partialMatch.endsWith('*')) {\n          partialMatch = path.slice(0, -1);\n        }\n        // Get the first match:\n        const candidate = event.path.startsWith(partialMatch) ? cloudfrontPathMappings[path] : undefined;\n        handler = handler || candidate;\n      });\n\n      // Invoke the function handler:\n      const result: APIGatewayProxyResult = handler ? await handler(event, {} as Context) : { statusCode: 404, body: `Path not matched: ${event.path} (${paths})` };\n\n      // Print out the response if successful\n      if (debug) {\n        console.log('Result:');\n        console.log(event.httpMethod, event.path, result.statusCode);\n        console.log(JSON.stringify(result, null, 2));\n      }\n\n      // Send the response\n      res.status(result.statusCode);\n      if (result.multiValueHeaders) {\n        for (const key of Object.keys(result.multiValueHeaders)) {\n          res.set(key, result.multiValueHeaders![key].map((value) => `${value}`));\n        };\n      }\n      if (result.headers) {\n        for (const key of Object.keys(result.headers)) {\n          res.set(key, `${result.headers![key]}`);\n        };\n      }\n\n      // Body\n      res.send(result.body);\n\n    } catch (e) {\n      // Log the error and send a 500 response\n      console.log(e);\n      console.log((e as Error).stack);\n      res.status(500).send(`${e}`);\n    };\n  });\n\n  app.listen(port, () => {\n    console.log(`Lambda handler can be invoked at http://localhost:${port}`);\n  });\n}\n"]}