@scloud/lambda-local
Version:
Run typical Lambda handlers locally.
145 lines • 17.9 kB
JavaScript
;
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var desc = Object.getOwnPropertyDescriptor(m, k);
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}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
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Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
var ownKeys = function(o) {
ownKeys = Object.getOwnPropertyNames || function (o) {
var ar = [];
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if (mod && mod.__esModule) return mod;
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__setModuleDefault(result, mod);
return result;
};
})();
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.webappLocal = webappLocal;
const fs = __importStar(require("fs"));
const express_1 = __importDefault(require("express"));
const cors_1 = __importDefault(require("cors"));
function webappLocal(handler, staticContent, debug = false) {
if (staticContent?.sourceDirectory) {
if (!fs.existsSync(staticContent.sourceDirectory)) {
throw new Error(`Static directory not found: ${staticContent.sourceDirectory}`);
}
}
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: '*/*', limit: '6mb' }));
// Allow all origins for local development
app.use((0, cors_1.default)({
// eslint-disable-next-line @typescript-eslint/no-explicit-any
origin: (origin, callback) => callback(null, origin),
credentials: true,
}));
// "Static bucket" serving
if (staticContent)
app.use(staticContent.appPath, express_1.default.static(staticContent.sourceDirectory));
// Route everything else to the Lambda handler function
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,
},
};
try {
// Print out the event that will be sent to the handler
if (debug) {
console.log('Event:');
console.log(event.httpMethod, event.path);
console.log(JSON.stringify(event, null, 2));
}
// Invoke the function handler:
const result = await handler(event, {});
// 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));
}
// Headers
res.status(result.statusCode);
for (const key of Object.keys(result.multiValueHeaders || [])) {
res.set(key, result.multiValueHeaders[key].map((value) => `${value}`));
}
;
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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},\n  debug = false,\n) {\n  if (staticContent?.sourceDirectory) {\n    if (!fs.existsSync(staticContent.sourceDirectory)) {\n      throw new Error(`Static directory not found: ${staticContent.sourceDirectory}`);\n    }\n  }\n\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: '*/*', limit: '6mb' }));\n\n  // Allow all origins for local development\n  app.use(\n    cors({\n      // eslint-disable-next-line @typescript-eslint/no-explicit-any\n      origin: (origin: any, callback: any) => callback(null, origin),\n      credentials: true,\n    }),\n  );\n\n    // \"Static bucket\" serving\n  if (staticContent) app.use(staticContent.appPath, express.static(staticContent.sourceDirectory));\n\n  // Route everything else to the Lambda handler function\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    try {\n      // Print out the event that will be sent to the handler\n      if (debug) {\n        console.log('Event:');\n        console.log(event.httpMethod, event.path);\n        console.log(JSON.stringify(event, null, 2));\n      }\n\n      // Invoke the function handler:\n      const result = await handler(event, {} as Context);\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      // Headers\n      res.status(result.statusCode);\n      for (const key of Object.keys(result.multiValueHeaders || [])) {\n        res.set(key, result.multiValueHeaders![key].map((value) => `${value}`));\n      };\n\n      for (const key of Object.keys(result.headers || [])) {\n        res.set(key, `${result.headers![key]}`);\n      };\n\n      // Body\n      res.send(result.body);\n\n    } catch (e) {\n      // Log the error and send a 500 response\n      console.log(e);\n      console.log((e as Error).stack);\n      res.status(500).send(`${e}`);\n    };\n  });\n\n  app.listen(port, () => {\n    console.log(`Lambda handler can be invoked at http://localhost:${port}`);\n  });\n}\n"]}