Fix CORS race condition

Author: pmuens

lib/plugins/aws/package/compile/events/apiGateway/index.js

@@ -23,6 +23,9 @@ class AwsCompileApigEvents {
     this.options = options;
     this.provider = this.serverless.getProvider('aws');
 
+    // used for the generated method logical ids (GET, PATCH, PUT, DELETE, OPTIONS, ...)
+    this.apiGatewayMethodLogicalIds = [];
+
     Object.assign(
       this,
       validate,

lib/plugins/aws/package/compile/events/apiGateway/index.test.js

@@ -75,6 +75,9 @@ describe('AwsCompileApigEvents', () => {
     it('should set the provider variable to be an instanceof AwsProvider', () =>
       expect(awsCompileApigEvents.provider).to.be.instanceof(AwsProvider));
 
+    it('should setup an empty array to gather the method logical ids', () =>
+      expect(awsCompileApigEvents.apiGatewayMethodLogicalIds).to.deep.equal([]));
+
     it('should run "package:compileEvents" promise chain in order', () => {
       const validateStub = sinon
         .stub(awsCompileApigEvents, 'validate').returns({

lib/plugins/aws/package/compile/events/apiGateway/lib/cors.js

@@ -4,7 +4,6 @@ const _ = require('lodash');
 const BbPromise = require('bluebird');
 
 module.exports = {
-
   compileCors() {
     _.forEach(this.validated.corsPreflight, (config, path) => {
       const resourceName = this.getResourceName(path);
@@ -41,6 +40,8 @@ module.exports = {
             .replace('ANY', 'DELETE,GET,HEAD,PATCH,POST,PUT');
       }
 
+      this.apiGatewayMethodLogicalIds.push(corsMethodLogicalId);
+
       _.merge(this.serverless.service.provider.compiledCloudFormationTemplate.Resources, {
         [corsMethodLogicalId]: {
           Type: 'AWS::ApiGateway::Method',
@@ -97,5 +98,4 @@ module.exports = {
       },
     ];
   },
-
 };

lib/plugins/aws/package/compile/events/apiGateway/lib/cors.test.js

@@ -33,13 +33,13 @@ describe('#compileCors()', () => {
       },
     };
     awsCompileApigEvents = new AwsCompileApigEvents(serverless, options);
+    awsCompileApigEvents.apiGatewayMethodLogicalIds = [];
     awsCompileApigEvents.apiGatewayRestApiLogicalId = 'ApiGatewayRestApi';
     awsCompileApigEvents.apiGatewayResources = {
       'users/create': {
         name: 'UsersCreate',
         resourceLogicalId: 'ApiGatewayResourceUsersCreate',
       },
-
       'users/list': {
         name: 'UsersList',
         resourceLogicalId: 'ApiGatewayResourceUsersList',
@@ -252,4 +252,29 @@ describe('#compileCors()', () => {
     expect(() => awsCompileApigEvents.compileCors())
       .to.throw(Error, 'maxAge should be an integer over 0');
   });
+
+  it('should add the methods resource logical id to the array of method logical ids', () => {
+    awsCompileApigEvents.validated.corsPreflight = {
+      'users/create': {
+        origins: ['*', 'http://example.com'],
+        headers: ['*'],
+        methods: ['OPTIONS', 'POST'],
+        allowCredentials: true,
+        maxAge: 86400,
+      },
+      'users/any': {
+        origins: ['http://example.com'],
+        headers: ['*'],
+        methods: ['OPTIONS', 'ANY'],
+        allowCredentials: false,
+      },
+    };
+    return awsCompileApigEvents.compileCors().then(() => {
+      expect(awsCompileApigEvents.apiGatewayMethodLogicalIds)
+        .to.deep.equal([
+          'ApiGatewayMethodUsersCreateOptions',
+          'ApiGatewayMethodUsersAnyOptions',
+        ]);
+    });
+  });
 });

lib/plugins/aws/package/compile/events/apiGateway/lib/method/index.js

@@ -4,9 +4,7 @@ const BbPromise = require('bluebird');
 const _ = require('lodash');
 
 module.exports = {
-
   compileMethods() {
-    this.apiGatewayMethodLogicalIds = [];
     this.permissionMapping = [];
 
     this.validated.events.forEach((event) => {

lib/plugins/aws/package/compile/events/apiGateway/lib/method/index.test.js

@@ -34,6 +34,7 @@ describe('#compileMethods()', () => {
     };
     awsCompileApigEvents = new AwsCompileApigEvents(serverless, options);
     awsCompileApigEvents.validated = {};
+    awsCompileApigEvents.apiGatewayMethodLogicalIds = [];
     awsCompileApigEvents.apiGatewayRestApiLogicalId = 'ApiGatewayRestApi';
     awsCompileApigEvents.apiGatewayResources = {
       'users/create': {
@@ -609,7 +610,7 @@ describe('#compileMethods()', () => {
     });
   });
 
-  it('should create methodLogicalIds array', () => {
+  it('should update the method logical ids array', () => {
     awsCompileApigEvents.validated.events = [
       {
         functionName: 'First',
@@ -628,6 +629,10 @@ describe('#compileMethods()', () => {
     ];
     return awsCompileApigEvents.compileMethods().then(() => {
       expect(awsCompileApigEvents.apiGatewayMethodLogicalIds.length).to.equal(2);
+      expect(awsCompileApigEvents.apiGatewayMethodLogicalIds).to.deep.equal([
+        'ApiGatewayMethodUsersCreatePost',
+        'ApiGatewayMethodUsersListGet',
+      ]);
     });
   });