[nmorgan-cb]

Description

Adds a deterministic, OpenAPI-driven generator for the full Prime Java client surface (models, requests, responses, services, PrimeServiceFactory), and converges Java method/type names on the canonical names shared with the .NET, TypeScript, Python, and Go Prime SDKs — generating a @Deprecated compatibility alias for every existing public Java name that changes.

This PR adds the generator, its config, and tests. It does not include regenerated SDK source; see Generation preview below.

Review guide

Each commit is a self-contained step that builds and passes its tests:

1. feat(generator): parse the OpenAPI spec into SDK operation bindings: spec parsing and fetching, config and overrides, binding derivation and validation, type resolution, and the operation inventory lock.
2. feat(generator): route error enums and own generated model files: model post-processing, error-enum routing, and the manifest that tracks generated model files.
3. feat(generator): generate requests, responses, services, and factory: the emission phases, the Main CLI (--check/--live-diff), the Makefile, and CoinbasePrimeClient /v2 support.
4. feat(generator): generate deprecated Java aliases for canonical names: the alias config, alias emission, and the naming parity fixture.
5. ci: gate generator tests and generated SDK compilation: runs the generator tests in CI, and adds a generated-sdk job that regenerates the SDK from the committed spec, compiles it, and runs the SDK tests.

Generator

• Committed spec (apiSpec/prime-public-spec.yaml) drives normal generation and CI; live fetch/diff is explicit and non-mutating.
• Raw OpenAPI model/enum generation → post-processing → custom request/response/service/factory emission.
• Preserves builders, pagination, status handling, /v1//v2 routing, PrimeXM* naming, and existing model transforms.
• Routes *ErrorCode/*Subcode enums into com.coinbase.prime.model.errors.
• make fetch-spec, make generate, make check-generated, make generate-live-diff — check/live-diff render only in isolated temp dirs, never mutate the checkout.
• Stays aligned with the vended SDK: optional DTO booleans stay boxed (Boolean), and primitive fields such as CreateOrderRequest.isRaiseExact/isBuyExact are kept via overrides.
• operation-inventory.json locks the service and method of all 111 current operations. New spec operations generate automatically, while renames or removals fail OperationInventoryTest.
• Fails before writing anything: bindings are validated before models are written, and a failed or empty fetch-spec never overwrites the committed spec. Missing operationIds, ambiguous inline enums, and duplicate service names are rejected.
• CoinbasePrimeClient.withBaseUrl now keeps an injected HttpClient (used by generated /v2 calls).

Canonical naming + generated deprecated aliases

Every alias is declared in operations-overrides.json, never hand-written:

{
  "operationId": "PrimeRESTAPI_CreateWalletTransfer",
  "sdkMethod": "CreateTransfer",
  "deprecatedAliases": [{ "sdkMethod": "CreateWalletTransfer", "message": "Use createTransfer instead." }]
}

For each entry, the generator emits a @Deprecated request subclass (with a covariant Builder subclass, so new LegacyRequest.Builder()...build() still compiles and returns the legacy type), a @Deprecated response subclass, and @Deprecated forwarding methods on the service interface and implementation.

Canonical	Deprecated alias
createTransfer	createWalletTransfer
createWithdrawal	createWalletWithdrawal
getOrder	getOrderByOrderId
claimStakingRewards	claimRewards
createPortfolioStake	portfolioStakingInitiate
createPortfolioUnstake	portfolioStakingUnstake
listEntityPaymentMethods	listPaymentMethods
getEntityPaymentMethod	getPaymentMethodDetails
listActivities	listPortfolioActivities
getAddressBook	listAddressBook
getAllocationsByClientNettingId	listAllocationsByNettingId

listEntityUsers, getEntityFcmBalance, and getPortfolioCounterpartyId stay canonical as-is.

config/naming-parity.json plus NamingParityTest lock this mapping in-repo, without cloning other SDK repositories in CI.

Tests

• Generator: 45 tests (was 29). Adds DeprecatedAliasGenerationTest, NamingParityTest, OperationInventoryTest, and SpecFetcherTest.
• Root SDK: 287 tests. Adds CoinbasePrimeClientTest.

Generation preview

Ran make generate in an isolated git worktree, then compiled and tested the generated SDK (287 tests passing), including existing example programs, which compile with deprecation warnings on legacy calls. make check-generated reports new canonical types as additions and legacy names as converted alias files. The preview caught a real bug: alias Builder.build() initially skipped the canonical (private) validate(); it's now protected and called via super.validate().

The generated SDK baseline itself (models, DTOs, services, factory, error enums, manifest) will be committed in a follow-up, after a public API diff review, then make check-generated becomes a required CI gate.

Type of Change

• Bug fix
• New feature
• Breaking change
• Dependency update
• Refactor / cleanup
• Other (describe below)

Checklist

• Tests included / updated
• Changelog updated
• Version bump if needed

[cb-heimdall]

🟡 Heimdall Review Status

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