angular-aws-apig

angular-aws-apig

This library provides an Interceptor for angular $http service that signs all request to AWS APIGateway with IAM credentials. It is handy when you use temprorary IAM Credentials from AWS Cognito or Auth0. Although AWS APIGateway provides autogenerated Javascript SDK, you can't use it with angular $http service and you need to regenerate it every time you change something in the API.

Installing it

You have several options:

bower install angular-aws-apig --save

npm install angular-aws-apig --save

Or just include dist/angular-aws-apig.js or dist/angular-aws-apig.min.js in to your index.html

Basic usage

angular.module('app', ['angular-aws-apig'])
.config(function Config($httpProvider, APIGInterceptorProvider) {
	APIGInterceptorProvider.config({
		headers: {},
		region: 'us-east-1',
		service: 'execute-api',
		urlRegex: ''
	})

	/* @ngInject */
	APIGInterceptorProvider.headersGetter = function(myService, request) {
		myService.doSomething();
		return request.headers;
	};

	/* @ngInject */
	APIGInterceptorProvider.credentialsGetter = function(store, request) {
		return store.get('credentials');
	};

	$httpProvider.interceptors.push('APIGInterceptor');
});

APIGInterceptorProvider.config

• headers - global headers that would be added to all api requests (default: {})
• region - AWS region (default: us-east-1)
• service - AWS service (default: execute-api)
• urlRegex - RegEx string, Interceptor would ignore requests to url that doesn't match this RegEx. (default: '')

All options could be passed in APIGInterceptorProvider.config function as a single object or assigned directly

APIGInterceptorProvider.urlRegex = 'myapi.com';

APIGInterceptorProvider.headersGetter

A function that provides dynamic headers. It accepts $http request object as a parameter and must return headers object. You can pass angular dependencies in this function.

APIGInterceptorProvider.headersGetter = function($rootScope, request) {
		var headers = request.headers
		headers.foo = $rootScope.foo;
		return headers;
	};

APIGInterceptorProvider.credentialsGetter

A function that provides dynamic AWS IAM Credentials. It accepts $http request object as a parameter and must return credentials object. You can pass angular dependencies in this function. Function can return $q promise.
If this function is not specified APIGInterceptor will try to get credentials from AWS.config.credentials

APIGInterceptorProvider.credentialsGetter = function(awsCredentials, auth) {
		return awsCredentials.get(auth.idToken);
	};

In this example awsCredentials.get returns a promise that resolves with credentials object

  {
    accessKeyId: 'accessKeyId',
    secretAccessKey: 'secretAccessKey',
    sessionToken: 'sessionToken'
  }

$APIGError event

This event would be triggered on request error.

$rootScope.$on('$APIGError', (event, error) => {
  $log.debug(event, error);
});

Credits

This library is a wrapper around aws4 npm package.