# AWS APIGatewayv2 Authorizers
<!--BEGIN STABILITY BANNER-->---
> The APIs of higher level constructs in this module are experimental and under active development.
> They are subject to non-backward compatible changes or removal in any future version. These are
> not subject to the [Semantic Versioning](https://semver.org/) model and breaking changes will be
> announced in the release notes. This means that while you may use them, you may need to update
> your source code when upgrading to a newer version of this package.
---
<!--END STABILITY BANNER-->
## Table of Contents
* [Introduction](#introduction)
* [HTTP APIs](#http-apis)
* [Default Authorization](#default-authorization)
* [Route Authorization](#route-authorization)
* [JWT Authorizers](#jwt-authorizers)
* [User Pool Authorizer](#user-pool-authorizer)
* [Lambda Authorizers](#lambda-authorizers)
* [IAM Authorizers](#iam-authorizers)
* [WebSocket APIs](#websocket-apis)
* [Lambda Authorizer](#lambda-authorizer)
## Introduction
API Gateway supports multiple mechanisms for controlling and managing access to your HTTP API. They are mainly
classified into Lambda Authorizers, JWT authorizers and standard AWS IAM roles and policies. More information is
available at [Controlling and managing access to an HTTP
API](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-access-control.html).
## HTTP APIs
Access control for Http Apis is managed by restricting which routes can be invoked via.
Authorizers and scopes can either be applied to the api, or specifically for each route.
### Default Authorization
When using default authorization, all routes of the api will inherit the configuration.
In the example below, all routes will require the `manage:books` scope present in order to invoke the integration.
```python
from aws_cdk.aws_apigatewayv2_authorizers import HttpJwtAuthorizer
issuer = "https://test.us.auth0.com"
authorizer = HttpJwtAuthorizer("DefaultAuthorizer", issuer,
jwt_audience=["3131231"]
)
api = apigwv2.HttpApi(self, "HttpApi",
default_authorizer=authorizer,
default_authorization_scopes=["manage:books"]
)
```
### Route Authorization
Authorization can also configured for each Route. When a route authorization is configured, it takes precedence over default authorization.
The example below showcases default authorization, along with route authorization. It also shows how to remove authorization entirely for a route.
* `GET /books` and `GET /books/{id}` use the default authorizer settings on the api
* `POST /books` will require the [write:books] scope
* `POST /login` removes the default authorizer (unauthenticated route)
```python
from aws_cdk.aws_apigatewayv2_authorizers import HttpJwtAuthorizer
from aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration
issuer = "https://test.us.auth0.com"
authorizer = HttpJwtAuthorizer("DefaultAuthorizer", issuer,
jwt_audience=["3131231"]
)
api = apigwv2.HttpApi(self, "HttpApi",
default_authorizer=authorizer,
default_authorization_scopes=["read:books"]
)
api.add_routes(
integration=HttpUrlIntegration("BooksIntegration", "https://get-books-proxy.myproxy.internal"),
path="/books",
methods=[apigwv2.HttpMethod.GET]
)
api.add_routes(
integration=HttpUrlIntegration("BooksIdIntegration", "https://get-books-proxy.myproxy.internal"),
path="/books/{id}",
methods=[apigwv2.HttpMethod.GET]
)
api.add_routes(
integration=HttpUrlIntegration("BooksIntegration", "https://get-books-proxy.myproxy.internal"),
path="/books",
methods=[apigwv2.HttpMethod.POST],
authorization_scopes=["write:books"]
)
api.add_routes(
integration=HttpUrlIntegration("LoginIntegration", "https://get-books-proxy.myproxy.internal"),
path="/login",
methods=[apigwv2.HttpMethod.POST],
authorizer=apigwv2.HttpNoneAuthorizer()
)
```
### JWT Authorizers
JWT authorizers allow the use of JSON Web Tokens (JWTs) as part of [OpenID Connect](https://openid.net/specs/openid-connect-core-1_0.html) and [OAuth 2.0](https://oauth.net/2/) frameworks to allow and restrict clients from accessing HTTP APIs.
When configured, API Gateway validates the JWT submitted by the client, and allows or denies access based on its content.
The location of the token is defined by the `identitySource` which defaults to the http `Authorization` header. However it also
[supports a number of other options](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-lambda-authorizer.html#http-api-lambda-authorizer.identity-sources).
It then decodes the JWT and validates the signature and claims, against the options defined in the authorizer and route (scopes).
For more information check the [JWT Authorizer documentation](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-jwt-authorizer.html).
Clients that fail authorization are presented with either 2 responses:
* `401 - Unauthorized` - When the JWT validation fails
* `403 - Forbidden` - When the JWT validation is successful but the required scopes are not met
```python
from aws_cdk.aws_apigatewayv2_authorizers import HttpJwtAuthorizer
from aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration
issuer = "https://test.us.auth0.com"
authorizer = HttpJwtAuthorizer("BooksAuthorizer", issuer,
jwt_audience=["3131231"]
)
api = apigwv2.HttpApi(self, "HttpApi")
api.add_routes(
integration=HttpUrlIntegration("BooksIntegration", "https://get-books-proxy.myproxy.internal"),
path="/books",
authorizer=authorizer
)
```
#### User Pool Authorizer
User Pool Authorizer is a type of JWT Authorizer that uses a Cognito user pool and app client to control who can access your Api. After a successful authorization from the app client, the generated access token will be used as the JWT.
Clients accessing an API that uses a user pool authorizer must first sign in to a user pool and obtain an identity or access token.
They must then use this token in the specified `identitySource` for the API call. More information is available at [using Amazon Cognito user
pools as authorizer](https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-integrate-with-cognito.html).
```python
import aws_cdk.aws_cognito as cognito
from aws_cdk.aws_apigatewayv2_authorizers import HttpUserPoolAuthorizer
from aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration
user_pool = cognito.UserPool(self, "UserPool")
authorizer = HttpUserPoolAuthorizer("BooksAuthorizer", user_pool)
api = apigwv2.HttpApi(self, "HttpApi")
api.add_routes(
integration=HttpUrlIntegration("BooksIntegration", "https://get-books-proxy.myproxy.internal"),
path="/books",
authorizer=authorizer
)
```
### Lambda Authorizers
Lambda authorizers use a Lambda function to control access to your HTTP API. When a client calls your API, API Gateway invokes your Lambda function and uses the response to determine whether the client can access your API.
Lambda authorizers depending on their response, fall into either two types - Simple or IAM. You can learn about differences [here](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-lambda-authorizer.html#http-api-lambda-authorizer.payload-format-response).
```python
from aws_cdk.aws_apigatewayv2_authorizers import HttpLambdaAuthorizer, HttpLambdaResponseType
from aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration
# This function handles your auth logic
# auth_handler: lambda.Function
authorizer = HttpLambdaAuthorizer("BooksAuthorizer", auth_handler,
response_types=[HttpLambdaResponseType.SIMPLE]
)
api = apigwv2.HttpApi(self, "HttpApi")
api.add_routes(
integration=HttpUrlIntegration("BooksIntegration", "https://get-books-proxy.myproxy.internal"),
path="/books",
authorizer=authorizer
)
```
### IAM Authorizers
API Gateway supports IAM via the included `HttpIamAuthorizer` and grant syntax:
```python
from aws_cdk.aws_apigatewayv2_authorizers import HttpIamAuthorizer
from aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration
# principal: iam.AnyPrincipal
authorizer = HttpIamAuthorizer()
http_api = apigwv2.HttpApi(self, "HttpApi",
default_authorizer=authorizer
)
routes = http_api.add_routes(
integration=HttpUrlIntegration("BooksIntegration", "https://get-books-proxy.myproxy.internal"),
path="/books/{book}"
)
routes[0].grant_invoke(principal)
```
## WebSocket APIs
You can set an authorizer to your WebSocket API's `$connect` route to control access to your API.
### Lambda Authorizer
Lambda authorizers use a Lambda function to control access to your WebSocket API. When a client connects to your API, API Gateway invokes your Lambda function and uses the response to determine whether the client can access your API.
```python
from aws_cdk.aws_apigatewayv2_authorizers import WebSocketLambdaAuthorizer
from aws_cdk.aws_apigatewayv2_integrations import WebSocketLambdaIntegration
# This function handles your auth logic
# auth_handler: lambda.Function
# This function handles your WebSocket requests
# handler: lambda.Function
authorizer = WebSocketLambdaAuthorizer("Authorizer", auth_handler)
integration = WebSocketLambdaIntegration("Integration", handler)
apigwv2.WebSocketApi(self, "WebSocketApi",
connect_route_options=apigwv2.WebSocketRouteOptions(
integration=integration,
authorizer=authorizer
)
)
```
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"description": "# AWS APIGatewayv2 Authorizers\n\n<!--BEGIN STABILITY BANNER-->---\n\n\n\n\n> The APIs of higher level constructs in this module are experimental and under active development.\n> They are subject to non-backward compatible changes or removal in any future version. These are\n> not subject to the [Semantic Versioning](https://semver.org/) model and breaking changes will be\n> announced in the release notes. This means that while you may use them, you may need to update\n> your source code when upgrading to a newer version of this package.\n\n---\n<!--END STABILITY BANNER-->\n\n## Table of Contents\n\n* [Introduction](#introduction)\n* [HTTP APIs](#http-apis)\n\n * [Default Authorization](#default-authorization)\n * [Route Authorization](#route-authorization)\n * [JWT Authorizers](#jwt-authorizers)\n\n * [User Pool Authorizer](#user-pool-authorizer)\n * [Lambda Authorizers](#lambda-authorizers)\n * [IAM Authorizers](#iam-authorizers)\n* [WebSocket APIs](#websocket-apis)\n\n * [Lambda Authorizer](#lambda-authorizer)\n\n## Introduction\n\nAPI Gateway supports multiple mechanisms for controlling and managing access to your HTTP API. They are mainly\nclassified into Lambda Authorizers, JWT authorizers and standard AWS IAM roles and policies. More information is\navailable at [Controlling and managing access to an HTTP\nAPI](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-access-control.html).\n\n## HTTP APIs\n\nAccess control for Http Apis is managed by restricting which routes can be invoked via.\n\nAuthorizers and scopes can either be applied to the api, or specifically for each route.\n\n### Default Authorization\n\nWhen using default authorization, all routes of the api will inherit the configuration.\n\nIn the example below, all routes will require the `manage:books` scope present in order to invoke the integration.\n\n```python\nfrom aws_cdk.aws_apigatewayv2_authorizers import HttpJwtAuthorizer\n\n\nissuer = \"https://test.us.auth0.com\"\nauthorizer = HttpJwtAuthorizer(\"DefaultAuthorizer\", issuer,\n jwt_audience=[\"3131231\"]\n)\n\napi = apigwv2.HttpApi(self, \"HttpApi\",\n default_authorizer=authorizer,\n default_authorization_scopes=[\"manage:books\"]\n)\n```\n\n### Route Authorization\n\nAuthorization can also configured for each Route. When a route authorization is configured, it takes precedence over default authorization.\n\nThe example below showcases default authorization, along with route authorization. It also shows how to remove authorization entirely for a route.\n\n* `GET /books` and `GET /books/{id}` use the default authorizer settings on the api\n* `POST /books` will require the [write:books] scope\n* `POST /login` removes the default authorizer (unauthenticated route)\n\n```python\nfrom aws_cdk.aws_apigatewayv2_authorizers import HttpJwtAuthorizer\nfrom aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration\n\n\nissuer = \"https://test.us.auth0.com\"\nauthorizer = HttpJwtAuthorizer(\"DefaultAuthorizer\", issuer,\n jwt_audience=[\"3131231\"]\n)\n\napi = apigwv2.HttpApi(self, \"HttpApi\",\n default_authorizer=authorizer,\n default_authorization_scopes=[\"read:books\"]\n)\n\napi.add_routes(\n integration=HttpUrlIntegration(\"BooksIntegration\", \"https://get-books-proxy.myproxy.internal\"),\n path=\"/books\",\n methods=[apigwv2.HttpMethod.GET]\n)\n\napi.add_routes(\n integration=HttpUrlIntegration(\"BooksIdIntegration\", \"https://get-books-proxy.myproxy.internal\"),\n path=\"/books/{id}\",\n methods=[apigwv2.HttpMethod.GET]\n)\n\napi.add_routes(\n integration=HttpUrlIntegration(\"BooksIntegration\", \"https://get-books-proxy.myproxy.internal\"),\n path=\"/books\",\n methods=[apigwv2.HttpMethod.POST],\n authorization_scopes=[\"write:books\"]\n)\n\napi.add_routes(\n integration=HttpUrlIntegration(\"LoginIntegration\", \"https://get-books-proxy.myproxy.internal\"),\n path=\"/login\",\n methods=[apigwv2.HttpMethod.POST],\n authorizer=apigwv2.HttpNoneAuthorizer()\n)\n```\n\n### JWT Authorizers\n\nJWT authorizers allow the use of JSON Web Tokens (JWTs) as part of [OpenID Connect](https://openid.net/specs/openid-connect-core-1_0.html) and [OAuth 2.0](https://oauth.net/2/) frameworks to allow and restrict clients from accessing HTTP APIs.\n\nWhen configured, API Gateway validates the JWT submitted by the client, and allows or denies access based on its content.\n\nThe location of the token is defined by the `identitySource` which defaults to the http `Authorization` header. However it also\n[supports a number of other options](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-lambda-authorizer.html#http-api-lambda-authorizer.identity-sources).\nIt then decodes the JWT and validates the signature and claims, against the options defined in the authorizer and route (scopes).\nFor more information check the [JWT Authorizer documentation](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-jwt-authorizer.html).\n\nClients that fail authorization are presented with either 2 responses:\n\n* `401 - Unauthorized` - When the JWT validation fails\n* `403 - Forbidden` - When the JWT validation is successful but the required scopes are not met\n\n```python\nfrom aws_cdk.aws_apigatewayv2_authorizers import HttpJwtAuthorizer\nfrom aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration\n\n\nissuer = \"https://test.us.auth0.com\"\nauthorizer = HttpJwtAuthorizer(\"BooksAuthorizer\", issuer,\n jwt_audience=[\"3131231\"]\n)\n\napi = apigwv2.HttpApi(self, \"HttpApi\")\n\napi.add_routes(\n integration=HttpUrlIntegration(\"BooksIntegration\", \"https://get-books-proxy.myproxy.internal\"),\n path=\"/books\",\n authorizer=authorizer\n)\n```\n\n#### User Pool Authorizer\n\nUser Pool Authorizer is a type of JWT Authorizer that uses a Cognito user pool and app client to control who can access your Api. After a successful authorization from the app client, the generated access token will be used as the JWT.\n\nClients accessing an API that uses a user pool authorizer must first sign in to a user pool and obtain an identity or access token.\nThey must then use this token in the specified `identitySource` for the API call. More information is available at [using Amazon Cognito user\npools as authorizer](https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-integrate-with-cognito.html).\n\n```python\nimport aws_cdk.aws_cognito as cognito\nfrom aws_cdk.aws_apigatewayv2_authorizers import HttpUserPoolAuthorizer\nfrom aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration\n\n\nuser_pool = cognito.UserPool(self, \"UserPool\")\n\nauthorizer = HttpUserPoolAuthorizer(\"BooksAuthorizer\", user_pool)\n\napi = apigwv2.HttpApi(self, \"HttpApi\")\n\napi.add_routes(\n integration=HttpUrlIntegration(\"BooksIntegration\", \"https://get-books-proxy.myproxy.internal\"),\n path=\"/books\",\n authorizer=authorizer\n)\n```\n\n### Lambda Authorizers\n\nLambda authorizers use a Lambda function to control access to your HTTP API. When a client calls your API, API Gateway invokes your Lambda function and uses the response to determine whether the client can access your API.\n\nLambda authorizers depending on their response, fall into either two types - Simple or IAM. You can learn about differences [here](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-lambda-authorizer.html#http-api-lambda-authorizer.payload-format-response).\n\n```python\nfrom aws_cdk.aws_apigatewayv2_authorizers import HttpLambdaAuthorizer, HttpLambdaResponseType\nfrom aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration\n\n# This function handles your auth logic\n# auth_handler: lambda.Function\n\n\nauthorizer = HttpLambdaAuthorizer(\"BooksAuthorizer\", auth_handler,\n response_types=[HttpLambdaResponseType.SIMPLE]\n)\n\napi = apigwv2.HttpApi(self, \"HttpApi\")\n\napi.add_routes(\n integration=HttpUrlIntegration(\"BooksIntegration\", \"https://get-books-proxy.myproxy.internal\"),\n path=\"/books\",\n authorizer=authorizer\n)\n```\n\n### IAM Authorizers\n\nAPI Gateway supports IAM via the included `HttpIamAuthorizer` and grant syntax:\n\n```python\nfrom aws_cdk.aws_apigatewayv2_authorizers import HttpIamAuthorizer\nfrom aws_cdk.aws_apigatewayv2_integrations import HttpUrlIntegration\n\n# principal: iam.AnyPrincipal\n\n\nauthorizer = HttpIamAuthorizer()\n\nhttp_api = apigwv2.HttpApi(self, \"HttpApi\",\n default_authorizer=authorizer\n)\n\nroutes = http_api.add_routes(\n integration=HttpUrlIntegration(\"BooksIntegration\", \"https://get-books-proxy.myproxy.internal\"),\n path=\"/books/{book}\"\n)\n\nroutes[0].grant_invoke(principal)\n```\n\n## WebSocket APIs\n\nYou can set an authorizer to your WebSocket API's `$connect` route to control access to your API.\n\n### Lambda Authorizer\n\nLambda authorizers use a Lambda function to control access to your WebSocket API. When a client connects to your API, API Gateway invokes your Lambda function and uses the response to determine whether the client can access your API.\n\n```python\nfrom aws_cdk.aws_apigatewayv2_authorizers import WebSocketLambdaAuthorizer\nfrom aws_cdk.aws_apigatewayv2_integrations import WebSocketLambdaIntegration\n\n# This function handles your auth logic\n# auth_handler: lambda.Function\n\n# This function handles your WebSocket requests\n# handler: lambda.Function\n\n\nauthorizer = WebSocketLambdaAuthorizer(\"Authorizer\", auth_handler)\n\nintegration = WebSocketLambdaIntegration(\"Integration\", handler)\n\napigwv2.WebSocketApi(self, \"WebSocketApi\",\n connect_route_options=apigwv2.WebSocketRouteOptions(\n integration=integration,\n authorizer=authorizer\n )\n)\n```\n\n\n",
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