Lambda authorizer for AWS API Gateway written in Ruby.

• Configure the API Gateway to use this Lambda function as the authorizer.
• Populate the database as below.

• token is the string provide as:
  • query string ?token=
  • HTTP header Authorization:
• path is a combination of API Gateway ID and route (prefixed by '/')
• methods if specified, dictates what is allowed; user lowercase
• valid unless true will denied
• valid_from timestamp, if specified, will be allowed thereafter
• valid_until timestamp, if specified, will be allowed until then
• context will be passed as is

{
  "token": "abcd1234efgh5678",    // primary key
  "path": "<API_GW_ID><ROUTE>",  // sort key
  "desc": "Admin to internal app",
  "methods": ["get", "post"],
  "valid": true,
  "valid_from": 1609459200,
  "valid_until": 1612137600,
  "context": {
    "id": "123456",
    "name": "User A",
    "isAdmin": true
  }
}