Adds support for Condition element in APIGatewayCustomAuthorizerPolicy.IAMPolicyStatement.

[ashishdhingra]

Issue #, if available: #588

Description of changes:
Adds support for Condition element in APIGatewayCustomAuthorizerPolicy.IAMPolicyStatement.

Kindly note the following:

• Used https://github.com/awslabs/aws-apigateway-lambda-authorizer-blueprints/ as a reference.
  • The Java type defines return type for Condition property as Map<String, Map<String, Object>>.
  • The .NET type specifies return type of Condition property as IDictionary<ConditionOperator, IDictionary<ConditionKey, string>>.
• Refer IAM JSON policy elements: Condition for IAM policy Condition reference. Per this reference, it is of the format "Condition" : { "{condition-operator}" : { "{condition-key}" : "{condition-value}" }}.
• The return type of APIGatewayCustomAuthorizerPolicy.IAMPolicyStatement.Condition is IDictionary<string, IDictionary<string, object>> similar to Java version due to following reasons:
  • Keep implementation simple to avoid to maintain enum types ConditionOperator and ConditionKey.
  • IAM JSON policy elements: Condition specifies support for complex types for condition-value. Hence, it is modeled as object type.
• The PR also initialized settings.NullValueHandling = NullValueHandling.Ignore in Amazon.Lambda.Serialization.Json.JsonSerializer.
  • This is to keep the behavior same as Amazon.Lambda.Serialization.SystemTextJson.LambdaJsonSerializer and Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer (per invocation of AbstractLambdaJsonSerializer.CreateDefaultJsonSerializationOptions()).
  • So that null Condition property (if not set) is not rendered in IAM Policy statement.
• Due to change above, reviewer,
  • Check the version bump.
  • Do we need to ensure that customer also updates to latest Amazon.Lambda.Serialization.Json.JsonSerializer package? The events classes do not have any direct reference to this package as expected. We use this package in event tests?
  • Should we also add test case to ASP.NET tests?

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