add type option to authorizer. implements #4325

docs/providers/aws/events/apigateway.md

@@ -277,6 +277,7 @@ functions:
             resultTtlInSeconds: 0
             identitySource: method.request.header.Authorization
             identityValidationExpression: someRegex
+            type: token
   authorizerFunc:
     handler: handler.authorizerFunc
 ```
@@ -313,6 +314,24 @@ functions:
             identityValidationExpression: someRegex
 ```
 
+You can also use the Request Type Authorizer by setting the `type` property. In this case, you
+do not need the `identitySource`
+
+```yml
+functions:
+  create:
+    handler: posts.create
+    events:
+      - http:
+          path: posts/create
+          method: post
+          authorizer:
+            arn: xxx:xxx:Lambda-Name
+            resultTtlInSeconds: 0
+            identityValidationExpression: someRegex
+            type: request
+```
+
 You can also configure an existing Cognito User Pool as the authorizer, as shown
 in the following example:
 

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

@@ -37,7 +37,7 @@ module.exports = {
               '/invocations',
             ],
           ] };
-          authorizerProperties.Type = 'TOKEN';
+          authorizerProperties.Type = authorizer.type ? authorizer.type.toUpperCase() : 'TOKEN';
         }
 
         _.merge(this.serverless.service.provider.compiledCloudFormationTemplate.Resources, {

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

@@ -68,6 +68,7 @@ describe('#compileAuthorizers()', () => {
           resultTtlInSeconds: 500,
           identitySource: 'method.request.header.Custom',
           identityValidationExpression: 'regex',
+          type: 'request',
         },
       },
     }];
@@ -92,7 +93,7 @@ describe('#compileAuthorizers()', () => {
       expect(resource.Properties.IdentityValidationExpression).to.equal('regex');
       expect(resource.Properties.Name).to.equal('authorizer');
       expect(resource.Properties.RestApiId.Ref).to.equal('ApiGatewayRestApi');
-      expect(resource.Properties.Type).to.equal('TOKEN');
+      expect(resource.Properties.Type).to.equal('REQUEST');
     });
   });