Here lies a proof-of-concept generic AWS client. "Generic" in the sense that
it doesn't include or use any strongly typed classes to represent requests or responses. Instead the client accepts and returns JsonObject objects.
Some notes:
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This is somewhat a copy of boto3. (It uses an extremely cut-down version of of boto3's model files.)
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Credentials are levered out of the standard AWS sdk
AWSCredentialsProviderso nothing special is going on there. -
Request signing is a straightforward implementation cribbed from the AWS documentation. Here it takes the form of an oktthp interceptor.
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AWS services come in several flavors ("protocols" in boto3 lingo.) This code handles the JSON variants more or less and makes a half-hearted attempt at the XML ones. (The Jackson XMLMapper doesn't do the right thing out-of-the-box so there's a custom XML to JSON parser that only sort of works.)