Add Support for API Gateway Proxy events for WebSocket API

[musketyr]

the event for API Gateway Proxy events for WebSocket API has different format of the requestContext. Please, add support for these events as well.

{
    "requestContext": {
        "routeKey": "$default",
        "messageId": "Ti89OAAt3vcAAAQ=",
        "eventType": "MESSAGE",
        "extendedRequestId": "Ti89OF32joEFbiA=",
        "requestTime": "15/Jan/2019:13:09:27 +0000",
        "messageDirection": "IN",
        "stage": "test",
        "connectedAt": 1547557733712,
        "requestTimeEpoch": 1547557767850,
        "identity": {
            "sourceIp": "89.24.55.85"
        },
        "requestId": "Ti89OF32joEFbiA=",
        "domainName": "jzla12ar9e.execute-api.eu-west-1.amazonaws.com",
        "connectionId": "Ti835f_GEowCETQ=",
        "apiId": "jzla12ar9e"
    },
    "body": "hello",
    "isBase64Encoded": false
}

[PatrykGala]

Workaround:

public class ConnectHandler implements RequestHandler<Map<String, Object>, ApiGatewayResponse> {
    private static final Logger LOG = LogManager.getLogger(ConnectHandler.class);

    @Override
    public ApiGatewayResponse handleRequest(Map<String, Object> input, Context context) {
        String connectionId = extractConnectionId(input);
        LOG.info("connectionid: {}", connectionId);
        return ApiGatewayResponse.ok(connectionId);
    }

    private String extractConnectionId(Map<String, Object> input) {
        Map<String, Object> requestContext = (Map<String, Object>) input.get("requestContext");
        return (String) requestContext.get("connectionId");
    }
}

[lucasam]

I believe this PR #92 fixes this issue.
A new class https://github.com/aws/aws-lambda-java-libs/blob/master/aws-lambda-java-events/src/main/java/com/amazonaws/services/lambda/runtime/events/APIGatewayV2ProxyRequestEvent.java is created to handle APIGatewayV2 parameters

Still not present at version 2.6.0. Needs to be built from sources

[carlzogh]

Hey @musketyr - support for API Gateway WebSocket API events was released in version 2.2.7 of the aws-lambda-java-events library as APIGatewayV2ProxyRequest and APIGatewayV2ProxyResponse events.
The RequestContext model you're looking for is defined here https://github.com/aws/aws-lambda-java-libs/blob/master/aws-lambda-java-events/src/main/java/com/amazonaws/services/lambda/runtime/events/APIGatewayV2ProxyRequestEvent.java#L215-L554

[musketyr]

thanks, that looks correct!