@scloud/lambda-api
Version:
Lambda handler for API Gateway proxy requests
182 lines • 20.7 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.standardPath = standardPath;
exports.standardQueryParameters = standardQueryParameters;
exports.standardHeaders = standardHeaders;
exports.parseBody = parseBody;
exports.parseCookie = parseCookie;
exports.buildCookie = buildCookie;
exports.parseRequest = parseRequest;
exports.matchRoute = matchRoute;
const cookie = __importStar(require("cookie"));
/**
* Ensures the path is lowercased, always has a leading slash and never a trailing slash
* @param path APIGatewayProxyEvent.path
*/
function standardPath(path) {
// Get path segments, filtering out any blanks
const segments = path.split('/').filter((segment) => segment);
// Return path
return `/${segments.join('/').toLowerCase()}`;
}
/**
* Ensures a non-null object containing only query-string parameters that have a value.
* @param query APIGatewayProxyEvent.query
*/
function standardQueryParameters(query) {
if (!query)
return {};
const result = {};
Object.keys(query).forEach((parameter) => {
const value = query[parameter];
if (value)
result[parameter] = value;
});
return result;
}
/**
* Ensures all header names are lowercased for ease of access.
* @param headers APIGatewayProxyEvent.headers
*/
function standardHeaders(headers) {
const result = {};
Object.keys(headers).forEach((name) => {
const value = headers[name];
if (value) {
// Provide both original-case and lowercased (standardised) header names for ease of access:
result[name] = value;
result[name.toLowerCase()] = value;
}
});
return result;
}
/**
* Parses the body (if present) from application/x-www-form-urlencoded or JSON string.
* If the body fails to parse as JSOn, the raw body is returned.
* @param body APIGatewayProxyEvent.body
*/
function parseBody(body, isBase64Encoded, contentType = 'application/json') {
if (!body)
return {};
const content = isBase64Encoded ? Buffer.from(body, 'base64').toString('utf8') : body;
try {
if ((contentType || '').toLowerCase() === 'application/x-www-form-urlencoded') {
return Object.fromEntries(new URLSearchParams(content));
}
else {
// Default to parsing as JSON:
return JSON.parse(content);
}
}
catch (e) {
console.error(`Error parsing request body: ${e}`);
}
// Fallback to returning the raw body
return content;
}
/**
* Parses the cookie, if any, returning at minimum an empty object.
* @param headers APIGatewayProxyEvent.headers
*/
function parseCookie(headers) {
const header = headers.cookie || headers.Cookie || '';
return cookie.parse(header);
}
function buildCookie(values) {
if (!values)
return undefined;
const header = [];
const oneYear = 60 * 60 * 24 * 365;
Object.keys(values).forEach((key) => {
const value = values[key];
if (value === '') {
// If explicitly unset, expire the cookie value
header.push(cookie.serialize(key, '', {
expires: new Date(), secure: true, httpOnly: true, sameSite: 'strict',
}));
}
else if (value) {
// Otherwise, set it only if a value was given
header.push(cookie.serialize(key, value, {
maxAge: oneYear, secure: true, httpOnly: true, sameSite: 'strict',
}));
}
});
return header;
}
function parseRequest(event) {
return {
method: event.httpMethod,
path: standardPath(event.path),
query: standardQueryParameters(event.queryStringParameters),
headers: standardHeaders(event.headers),
body: parseBody(event.body, event.isBase64Encoded, event.headers['content-type']),
cookies: parseCookie(event.headers),
pathParameters: {}, // These need to be parsed as part of route matching
context: {}, // You can add any custom values you need to the request via this context
};
}
function matchRoute(routes, path) {
// Simple match
if (routes[path])
return { route: routes[path], params: {} };
// List paths to check
const paths = Object.keys(routes);
// Case-insensitive match
for (let p = 0; p < paths.length; p++) {
const candidate = paths[p];
if (candidate.toLowerCase() === path.toLowerCase())
return { route: routes[candidate], params: {} };
}
// Path-parameter matching
const pathSegments = path.split('/');
for (let p = 0; p < paths.length; p++) {
const candidate = paths[p];
const candidateSegments = candidate.split('/');
// First check: length match
if (pathSegments.length !== candidateSegments.length)
continue;
for (let s = 0; s < pathSegments.length; s++) {
const params = {};
const pathSegment = pathSegments[s];
const candidateSegment = candidateSegments[s];
if (candidateSegment.startsWith('{') && candidateSegment.endsWith('}')) {
// Path parameter
const name = candidateSegment.slice(1, -1);
params[name] = pathSegment;
}
else if (pathSegment !== candidateSegment) {
break;
}
if (s === pathSegments.length - 1) {
// Matched all segments
return { route: routes[candidate], params };
}
}
}
return { route: undefined, params: {} };
}
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{ APIGatewayProxyEvent } from 'aws-lambda';\nimport * as cookie from 'cookie';\nimport { Request, Route, Routes } from './types';\n\n/**\n * Ensures the path is lowercased, always has a leading slash and never a trailing slash\n * @param path APIGatewayProxyEvent.path\n */\nexport function standardPath(path: string): string {\n  // Get path segments, filtering out any blanks\n  const segments = path.split('/').filter((segment) => segment);\n  // Return path\n  return `/${segments.join('/').toLowerCase()}`;\n}\n\n/**\n * Ensures a non-null object containing only query-string parameters that have a value.\n * @param query APIGatewayProxyEvent.query\n */\nexport function standardQueryParameters(query: { [name: string]: string | undefined; } | null): { [name: string]: string; } {\n  if (!query) return {};\n  const result: { [name: string]: string; } = {};\n  Object.keys(query).forEach((parameter) => {\n    const value = query[parameter];\n    if (value) result[parameter] = value;\n  });\n  return result;\n}\n\n/**\n * Ensures all header names are lowercased for ease of access.\n * @param headers APIGatewayProxyEvent.headers\n */\nexport function standardHeaders(headers: { [name: string]: string | undefined; }): { [name: string]: string; } {\n  const result: { [name: string]: string; } = {};\n  Object.keys(headers).forEach((name) => {\n    const value = headers[name];\n    if (value) {\n      // Provide both original-case and lowercased (standardised) header names for ease of access:\n      result[name] = value;\n      result[name.toLowerCase()] = value;\n    }\n  });\n  return result;\n}\n\n/**\n * Parses the body (if present) from application/x-www-form-urlencoded or JSON string.\n * If the body fails to parse as JSOn, the raw body is returned.\n * @param body APIGatewayProxyEvent.body\n */\nexport function parseBody(body: string | null, isBase64Encoded: boolean, contentType: string = 'application/json'): Record<string, unknown> | string {\n  if (!body) return {};\n\n  const content = isBase64Encoded ? Buffer.from(body, 'base64').toString('utf8') : body;\n\n  try {\n    if ((contentType || '').toLowerCase() === 'application/x-www-form-urlencoded') {\n      return Object.fromEntries(new URLSearchParams(content));\n    } else {\n      // Default to parsing as JSON:\n      return JSON.parse(content);\n    }\n  } catch (e) {\n    console.error(`Error parsing request body: ${e}`);\n  }\n\n  // Fallback to returning the raw body\n  return content;\n}\n\n/**\n * Parses the cookie, if any, returning at minimum an empty object.\n * @param headers APIGatewayProxyEvent.headers\n */\nexport function parseCookie(headers: { [name: string]: string | undefined; }): { [name: string]: string; } {\n  const header = headers.cookie || headers.Cookie || '';\n  return cookie.parse(header);\n}\n\nexport function buildCookie(values: { [key: string]: string; } | undefined): string[] | undefined {\n  if (!values) return undefined;\n\n  const header: string[] = [];\n  const oneYear = 60 * 60 * 24 * 365;\n\n  Object.keys(values).forEach((key) => {\n    const value = values[key];\n    if (value === '') {\n      // If explicitly unset, expire the cookie value\n      header.push(cookie.serialize(key, '', {\n        expires: new Date(), secure: true, httpOnly: true, sameSite: 'strict',\n      }));\n    } else if (value) {\n      // Otherwise, set it only if a value was given\n      header.push(cookie.serialize(key, value, {\n        maxAge: oneYear, secure: true, httpOnly: true, sameSite: 'strict',\n      }));\n    }\n  });\n\n  return header;\n}\n\nexport function parseRequest(event: APIGatewayProxyEvent): Request {\n  return {\n    method: event.httpMethod,\n    path: standardPath(event.path),\n    query: standardQueryParameters(event.queryStringParameters),\n    headers: standardHeaders(event.headers),\n    body: parseBody(event.body, event.isBase64Encoded, event.headers['content-type']),\n    cookies: parseCookie(event.headers),\n    pathParameters: {}, // These need to be parsed as part of route matching\n    context: {}, // You can add any custom values you need to the request via this context\n  };\n}\n\nexport function matchRoute(routes: Routes, path: string): { route: Route | undefined, params: { [name: string]: string; }; } {\n  // Simple match\n  if (routes[path]) return { route: routes[path], params: {} };\n\n  // List paths to check\n  const paths = Object.keys(routes);\n\n  // Case-insensitive match\n  for (let p = 0; p < paths.length; p++) {\n    const candidate = paths[p];\n    if (candidate.toLowerCase() === path.toLowerCase()) return { route: routes[candidate], params: {} };\n  }\n\n  // Path-parameter matching\n  const pathSegments = path.split('/');\n\n  for (let p = 0; p < paths.length; p++) {\n    const candidate = paths[p];\n    const candidateSegments = candidate.split('/');\n\n    // First check: length match\n    if (pathSegments.length !== candidateSegments.length) continue;\n\n    for (let s = 0; s < pathSegments.length; s++) {\n      const params: { [name: string]: string; } = {};\n      const pathSegment = pathSegments[s];\n      const candidateSegment = candidateSegments[s];\n      if (candidateSegment.startsWith('{') && candidateSegment.endsWith('}')) {\n        // Path parameter\n        const name = candidateSegment.slice(1, -1);\n        params[name] = pathSegment;\n      } else if (pathSegment !== candidateSegment) {\n        break;\n      }\n\n      if (s === pathSegments.length - 1) {\n        // Matched all segments\n        return { route: routes[candidate], params };\n      }\n    }\n  }\n\n  return { route: undefined, params: {} };\n}\n"]}