feat(sdk)!: switch to connect-rpc for GRPC

[mkleene]

• pull a TokenSource out of GRPCAuthInterceptor. This lets us keep the token code in Java while using idiomatic Kotlin stuff to modify the request

buf changes

• upgrade buf to v2
• remove buf generation from examples. Unless we need to call tagging or something we already have everything we need in sdk
• move the service definitions to test so that we don't ship things that we are just using for tests

dependency updates

• okhttp3 depends on version 1.9 of Kotlin. connect-rpc depends on version 2.1 but it's ok for okhttp3 to use a later version so we exclude its kotlin dependency.
• because connect-rpc depends on okhttp3:4.12.0 we downgrade our dependency instead of forcing connect to do a major version bump

address normalization

• We take the scheme (http vs https) from the value of usePlaintext
• If a port is specified we use it. If not we default based on the value of usePlaintext (true -> 80, false -> 443)

[Copilot]

Pull Request Overview

This PR updates the SDK to use connect-rpc for GRPC communication while also reorganizing the codebase to use generated service definitions instead of shipping test-only code. The key changes include replacing gRPC stubs with connect-rpc clients, updating buf configuration files to version v2 with new generation rules, and aligning example modules to use the new blocking API calls.

Reviewed Changes

Copilot reviewed 30 out of 35 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sdk/src/main/java/io/opentdf/platform/sdk/KASClient.java	Migrates from gRPC channels to connect-rpc with updated blocking calls and error handling.
sdk/src/main/java/io/opentdf/platform/sdk/Config.java	Updates import references and minor code cleanup.
sdk/src/main/java/io/opentdf/platform/sdk/Autoconfigure.java	Replaces policy package imports with generated equivalents and updates service calls.
sdk/src/main/java/io/opentdf/platform/sdk/AddressNormalizer.java	Introduces a new utility for normalizing addresses compatible with plaintext settings.
sdk/buf.yaml and sdk/buf.gen.yaml	Upgrades configuration versions and adjusts generation options.
examples/*	Updates example calls to use the new connect-rpc blocking API methods.

Files not reviewed (5)

• examples/buf.gen.yaml: Language not supported
• examples/buf.yaml: Language not supported
• examples/pom.xml: Language not supported
• pom.xml: Language not supported
• sdk/pom.xml: Language not supported

Comments suppressed due to low confidence (2)

sdk/src/main/java/io/opentdf/platform/sdk/KASClient.java:105

• [nitpick] Consider using a unified error handling utility; here 'RequestHelper.getOrThrow' is used while other parts of the codebase use 'ResponseMessageKt.getOrThrow'.

resp = RequestHelper.getOrThrow(req);

sdk/src/main/java/io/opentdf/platform/sdk/KASClient.java:261

• [nitpick] Consider using consistent variable naming for request objects. The variable 'req' is renamed to 'request' in close proximity, which might be confusing.

var request = getStub(keyAccess.url).rewrapBlocking(req, Collections.emptyMap()).execute();

[Copilot]

Pull Request Overview

This PR migrates the GRPC client implementation to use connect‑rpc along with several dependency and configuration updates. Key changes include:

• Replacing gRPC channel and stub creation with OkHttpClient and ProtocolClient.
• Upgrading buf configuration to v2 and updating code generation settings.
• Adjusting address normalization logic and updating example usages to call new blocking APIs.

Reviewed Changes

Copilot reviewed 32 out of 37 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sdk/src/main/java/io/opentdf/platform/sdk/KASClient.java	Updated KASClient constructor, stub retrieval, and close logic to use connect‑rpc.
sdk/src/main/java/io/opentdf/platform/sdk/Config.java	Cleaned up redundant imports.
sdk/src/main/java/io/opentdf/platform/sdk/Autoconfigure.java	Updated attribute grants retrieval to use blocking client APIs.
sdk/src/main/java/io/opentdf/platform/sdk/AddressNormalizer.java	Added new address normalization logic using URI with updated scheme handling.
sdk/buf.yaml and sdk/buf.gen.yaml	Upgraded buf version and reconfigured code generation plugins.
examples/…	Updated examples to use new blocking methods and connect‑rpc ResponseMessageKt utilities.

Files not reviewed (5)

• examples/buf.gen.yaml: Language not supported
• examples/buf.yaml: Language not supported
• examples/pom.xml: Language not supported
• pom.xml: Language not supported
• sdk/pom.xml: Language not supported

Comments suppressed due to low confidence (2)

sdk/src/main/java/io/opentdf/platform/sdk/KASClient.java:252

• [nitpick] The use of 'req' followed by 'request' in the same method can be confusing; consider using a consistent or more descriptive naming scheme to improve clarity.

var req = RewrapRequest.newBuilder()

sdk/src/main/java/io/opentdf/platform/sdk/KASClient.java:44

• Changing KASClient visibility from public to package-private may limit external accessibility. Confirm if this change is intentional or consider reverting to public.

class KASClient implements SDK.KAS {

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud