Add InitializeOpenFgaAutoconfiguration

[rwinch]

Similar to Spring Boot's support for initializing a database it would be nice to add support for initializing OpenFGA using convention based resources for both the authorization model(s) and initial relations.

This is very similar to LoadFgaData except:

• It is automatically activated based upon the presence of well known files on the classpath. Users would only need to add files in the well known location(s) to activate the configuration
• We can add support for customizing the location
• We could take this further and create a (non-spring) library similar to liquibase could be created for managing the configuration in production (possibly separate ticket)
• We can consider adding a way to specify data at the test method level (possibly separate ticket)

[rwinch]

@jimmyjames I'm happy to submit a PR if you agree with this

[Crain-32]

I got a version working locally (for the most part), just waiting on the Testcontainer PR to really test it, then I can make another PR.

It also adds in a new property fgaStoreName, since we should assume if we're populating the auth model, we need to create a Store. I've included the code for reference since I can't make a PR yet.

    private void doInitialization() throws Exception {
        if (openFgaProperties.getStoreId() != null) {
            validateStore(openFgaProperties.getFgaStoreId()); // Makes sure our Store ID is correct if provided
        } else {
            openFgaProperties.setFgaStoreId(makeStore()); // Creates a new Store using our fgaStoreName
        }

        if (openFgaProperties.getInitScript() != null) {
            var script = resourceLoader.getResource(openFgaProperties.getInitScript());
            var mapper = new ObjectMapper(); // Wrong thing to do for a proper init, but this works for now.
            var authWriteResponse = openFgaClient.writeAuthorizationModel(mapper.readValue(script.getContentAsByteArray(), WriteAuthorizationModelRequest.class)).get();
            openFgaProperties.setFgaAuthorizationModelId(authWriteResponse.getAuthorizationModelId());
        }

[Crain-32]

@rwinch I see you doing some PR stuff. Are you adding this to your PR? I was just about to push my implementation before checking up on it.

Looking at the PR right now, I'll base my changes off that, and just keep an eye on any changes you make.

I also broke the gradlew in gh-6, that's on me

[rwinch]

@Crain-32

Looking at the PR right now, I'll base my changes off that, and just keep an eye on any changes you make.

Sorry about that. I hope that it didn't make your changes too difficult. I've finished with a single PR with multiple commits to make it easier to merge.

I also broke the gradlew in https://github.com/jimmyjames/fga-spring-examples/issues/6, that's on me

No worries. It should be fixed now.

[Crain-32]

None of your changes impacted me, since I'm just targeting the LoadFgaData for my stuff.

Will make rebasing on your changes a lot easier, should that happen.