updated to aws sdk java v2.1.0

Author: aaronanderson

README.md

@@ -1,45 +1,38 @@
-# jax-rs-aws-signerv4
-After scouring the Internet for a simple [AWS Signature Version 4 Signing](https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html) java library with limited dependencies and support for JAX-RS 2.0 and not finding one I decided to write one. 
+# aws-java-sdk-v2-utils
 
-The main motivation for this library is to support JAX-RS calls to an AWS elasticsearch instance. the AWS Java API 2.0 has a client class for managing search domains but nothing for actually accessing the service.
+A few Java utility classes that extends the capabilities of the new aws-java-sdk-v2 library to handle use cases that are not supported by the new library yet.
 
-Previously I had used the AWS SDK 2.0 preview to create a [S3 presigning URL](https://gist.github.com/aaronanderson/f9e2806cc5e2c18fab4d7e60c589d160) Java utility but the current SDK codebase is geared for autogenerated clients and it is challenging to write a client by hand that initializes all the prerequisites. After examining several other Java AWS signing implementations and studying the AWS signing documentation I was able to develop a solution that meets my requirements. As an added bonus I was able to add presigning capabilities for S3 with little effort. 
+## S3Presigner
+Presigning S3 download URLS is common requirement for sharing download links to S3 content.
 
-If including an entire JAX-RS implementation is not an option, perhaps due to an AWS Lambda library size constraint, there is an example of using the AWS 2.0 SDK to send a signed request to an endpoint. This example uses the bare minimum client configuration to avoid NPEs. 
-
-## Configuration
-Create an instance of the AWSSignerClientRequestFilter class using the builder. Provide the AWS 
+ 
 ```
-DefaultCredentialsProvider provider  = DefaultCredentialsProvider.create();
-credentials = provider.getCredentials();
-AWSSignerClientRequestFilter.Builder builder = AWSSignerClientRequestFilter.builder().accessKeyID(credentials.accessKeyId()).secretAccessKey(credentials.secretAccessKey()).regionName("us-west-1").serviceName("es");
-if (AwsSessionCredentials.class.isAssignableFrom(credentials.getClass())) {
-  builder.sessionToken(() -> (((AwsSessionCredentials) credentials).sessionToken()));
-}
-AWSSignerClientRequestFilter signer = builder.build();
+AwsCredentialsProviderChain credentials = AwsCredentialsProviderChain.of(InstanceProfileCredentialsProvider.builder().build(), DefaultCredentialsProvider.create());
+S3Presigner s3Presigner = S3Presigner.builder().awsCredentials(credentials).build();
+URI presigned = s3Presigner.presignS3UploadLink("some-bucket", "some-directory/some-file.txt");
 ```
-Note I have not actually testes the token session feature but it should work.
 
-##JAX-RS
-Just register the filter/interceptor
-```
-client.register(signer);
-```
+## Elasticsearch
+the V2 SDK provides an API to manage the instances but not query the Elasticsearch endpoint. Since Elasticsearch is secured with standard AWS security a signed request is required. This utility uses JSON-P to handle the JSON response data.  
+
 
-##Pre-Sign
-Pass in the method, requestURI, and expiration duration
 ```
-URI presigned = signer.presign("GET", new URI("https://some-s3-bucket.s3-us-west-1.amazonaws.com/intworkspace.json"), Duration.ofDays(1));
+AWSSignerHttpClient client = AWSSignerHttpClient.builder().serviceName("es").awsCredentials(AwsCredentialsProviderChain.of(InstanceProfileCredentialsProvider.builder().build(), DefaultCredentialsProvider.create())).build();
+SdkHttpFullRequest httpRequest = SdkHttpFullRequest.builder().method(SdkHttpMethod.GET).protocol("https").host("search-some-aws-elasticsearch-domain.us-west-1.es.amazonaws.com").build();
+JsonObject obj = client.<JsonObject>execute(httpRequest);
 ```
 
-##AWS Java SDK 2.0 HTTP Client
-Configure the signing information and create a SdkHttpFullRequest request. Tested with version 2.0.0-preview-7
+##DynamoDB to JSON
+A utility for converting DynamoDB AttributeValue structures into JSON-P objects and vice versa. Support for compressing JSON into AttributeValue byte storage is also available to avoid exceeding the 400k entry size limit. 
+
 ```
-DefaultCredentialsProvider provider = DefaultCredentialsProvider.create();
-		AwsCredentials awsCredentials = provider.getCredentials();
-		SdkHttpClient sdkClient = ApacheSdkHttpClientFactory.builder().build().createHttpClient();
-		AWSSignerHttpClient client = AWSSignerHttpClient.builder().awsCredentials(awsCredentials).region(Region.US_WEST_1).serviceName("es").sdkClient(sdkClient).build();
+Map<String, AttributeValue> map = new HashMap<>();
+map.put("string", AttributeValue.builder().s("test").build());
+AttributeValue test = AttributeValue.builder().m(map).build();
+JsonObject json = (JsonObject) DynamoDBUtil.toJson(test);
 
-		SdkHttpFullRequest httpRequest = SdkHttpFullRequest.builder().method(SdkHttpMethod.GET).protocol("https").host("search-some-aws-elasticsearch-domain.us-west-1.es.amazonaws.com").build();
-		JsonObject obj = client.<JsonObject> execute(httpRequest);
+JsonObjectBuilder builder = Json.createObjectBuilder();
+builder.add("string", "test");
+Map<String, AttributeValue> attrValue = DynamoDBUtil.toAttribute(builder.build());
 ```
+