fix: Fixed detection of REST API type payloads in AWS Lambda

lib/serverless/api-gateway.js

@@ -97,6 +97,10 @@ function normalizeHeaders(event, lowerCaseKey = false) {
 
 /**
  * Determines if Lambda event appears to be a valid Lambda Proxy event.
+ * There are multiple types of events possible. They are described at
+ * https://docs.aws.amazon.com/lambda/latest/dg/services-apigateway.html#services-apigateway-apitypes.
+ * Each type of event has its own event payload structure; some types have
+ * multiple versions of the payload structure.
  *
  * @param {object} event The event to inspect.
  * @returns {boolean} Whether the given object contains fields necessary
@@ -106,7 +110,8 @@ function isLambdaProxyEvent(event) {
   return isGatewayV1Event(event) || isGatewayV2Event(event)
 }
 
-const v1Keys = [
+// See https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-input-format
+const restApiV1Keys = [
   'body',
   'headers',
   'httpMethod',
@@ -118,16 +123,23 @@ const v1Keys = [
   'queryStringParameters',
   'requestContext',
   'resource',
-  'stageVariables',
-  'version'
+  'stageVariables'
 ].join(',')
 
+// See https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html
+const httpApiV1Keys = [...restApiV1Keys.split(','), 'version'].join(',')
+
 function isGatewayV1Event(event) {
   const keys = Object.keys(event).sort().join(',')
-  return keys === v1Keys && event?.version === '1.0'
+  if (keys === httpApiV1Keys && event?.version === '1.0') {
+    return true
+  }
+
+  return keys === restApiV1Keys
 }
 
-const v2Keys = [
+// See https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html
+const httpApiV2Keys = [
   'body',
   'cookies',
   'headers',
@@ -144,7 +156,7 @@ const v2Keys = [
 
 function isGatewayV2Event(event) {
   const keys = Object.keys(event).sort().join(',')
-  return keys === v2Keys && event?.version === '2.0'
+  return keys === httpApiV2Keys && event?.version === '2.0'
 }
 
 /**

test/unit/serverless/fixtures.js

@@ -5,8 +5,7 @@
 
 'use strict'
 
-// https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html
-const gatewayV1Event = {
+const httpApiGatewayV1Event = {
   version: '1.0',
   resource: '/my/path',
   path: '/my/path',
@@ -77,8 +76,79 @@ const gatewayV1Event = {
   isBase64Encoded: false
 }
 
+// https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-input-format
+const restApiGatewayV1Event = {
+  resource: '/my/path',
+  path: '/my/path',
+  httpMethod: 'GET',
+  headers: {
+    header1: 'value1',
+    header2: 'value2'
+  },
+  multiValueHeaders: {
+    header1: ['value1'],
+    header2: ['value1', 'value2']
+  },
+  queryStringParameters: {
+    parameter1: 'value1',
+    parameter2: 'value'
+  },
+  multiValueQueryStringParameters: {
+    parameter1: ['value1', 'value2'],
+    parameter2: ['value']
+  },
+  requestContext: {
+    accountId: '123456789012',
+    apiId: 'id',
+    authorizer: {
+      claims: null,
+      scopes: null
+    },
+    domainName: 'id.execute-api.us-east-1.amazonaws.com',
+    domainPrefix: 'id',
+    extendedRequestId: 'request-id',
+    httpMethod: 'GET',
+    identity: {
+      accessKey: null,
+      accountId: null,
+      caller: null,
+      cognitoAuthenticationProvider: null,
+      cognitoAuthenticationType: null,
+      cognitoIdentityId: null,
+      cognitoIdentityPoolId: null,
+      principalOrgId: null,
+      sourceIp: '192.0.2.1',
+      user: null,
+      userAgent: 'user-agent',
+      userArn: null,
+      clientCert: {
+        clientCertPem: 'CERT_CONTENT',
+        subjectDN: 'www.example.com',
+        issuerDN: 'Example issuer',
+        serialNumber: 'a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1',
+        validity: {
+          notBefore: 'May 28 12:30:02 2019 GMT',
+          notAfter: 'Aug  5 09:36:04 2021 GMT'
+        }
+      }
+    },
+    path: '/my/path',
+    protocol: 'HTTP/1.1',
+    requestId: 'id=',
+    requestTime: '04/Mar/2020:19:15:17 +0000',
+    requestTimeEpoch: 1583349317135,
+    resourceId: null,
+    resourcePath: '/my/path',
+    stage: '$default'
+  },
+  pathParameters: null,
+  stageVariables: null,
+  body: 'Hello from Lambda!',
+  isBase64Encoded: false
+}
+
 // https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html
-const gatewayV2Event = {
+const httpApiGatewayV2Event = {
   version: '2.0',
   routeKey: '$default',
   rawPath: '/my/path',
@@ -175,7 +245,8 @@ const lambaV1InvocationEvent = {
 }
 
 module.exports = {
-  gatewayV1Event,
-  gatewayV2Event,
+  restApiGatewayV1Event,
+  httpApiGatewayV1Event,
+  httpApiGatewayV2Event,
   lambaV1InvocationEvent
 }

test/unit/serverless/utils.test.js

@@ -9,16 +9,23 @@ const test = require('node:test')
 const assert = require('node:assert')
 
 const { isGatewayV1Event, isGatewayV2Event } = require('../../../lib/serverless/api-gateway')
-const { gatewayV1Event, gatewayV2Event, lambaV1InvocationEvent } = require('./fixtures')
+const {
+  restApiGatewayV1Event,
+  httpApiGatewayV1Event,
+  httpApiGatewayV2Event,
+  lambaV1InvocationEvent
+} = require('./fixtures')
 
 test('isGatewayV1Event', () => {
-  assert.equal(isGatewayV1Event(gatewayV1Event), true)
-  assert.equal(isGatewayV1Event(gatewayV2Event), false)
+  assert.equal(isGatewayV1Event(restApiGatewayV1Event), true)
+  assert.equal(isGatewayV1Event(httpApiGatewayV1Event), true)
+  assert.equal(isGatewayV1Event(httpApiGatewayV2Event), false)
   assert.equal(isGatewayV1Event(lambaV1InvocationEvent), false)
 })
 
 test('isGatewayV2Event', () => {
-  assert.equal(isGatewayV2Event(gatewayV1Event), false)
-  assert.equal(isGatewayV2Event(gatewayV2Event), true)
+  assert.equal(isGatewayV2Event(restApiGatewayV1Event), false)
+  assert.equal(isGatewayV2Event(httpApiGatewayV1Event), false)
+  assert.equal(isGatewayV2Event(httpApiGatewayV2Event), true)
   assert.equal(isGatewayV2Event(lambaV1InvocationEvent), false)
 })