Amazon API Gateway & Authentication

Access using PHP

Here trying to demonstrate a that how to calculate signature for AWS Authorization.

I refer this link to implement the steps as describe https://docs.aws.amazon.com/general/latest/gr/sigv4_signing.html

How to use?

Step 1: Include the file where calculation and cURL implemented within two function.

include('./aws_secure_request.php');

Step 2: Set the values in configuration variable.

// Configuration values
$host = '<your host name>';
$accessKey = '<access key>';
$secretKey = '<secret key>';
$region = '<region>';
$service = '<service>';
$requestUrl	= '<full url>';
$uri = '<method path>';
$httpRequestMethod = '<http verb>';

For example
$region = 'ap-southeast-1'
$service = 'execute-api'
$requestUrl = 'https://host-domain/object/identifier'
$uri = '/object/identifier'
$httpRequestMethod = 'PUT'

Step 3: Prepare data to send to API.

$data = json_encode(array(
    "username" => "sample-demo",
    "firstName" => "Sample",
    "lastName" => "Demo",
    "date_of_birth" => "1999-05-08"
));

Step 4: Now call the method to generate signature get all headers need to send.

$headers = 
    calcualteAwsSignatureAndReturnHeaders(
        $host, $uri, $requestUrl, 
        $accessKey, $secretKey, $region
        $service, $httpRequestMethod, 
        $data, TRUE);

Step 5: Final step to call API using cURL.

$result = 
    callToAPI(
        $requestUrl, $httpRequestMethod, 
        $headers, $data, TRUE);

Note: Last parameter as TRUE in above two function can be use to show DEBUG information, otherwise just send FALSE.

You can use aws_request_sample.php to start.