harden: add optional owner validation to fetchSlab

[0x-SquidSol]

Summary

• fetchSlab returned raw account data without checking info.owner against the expected Percolator program ID
• A malicious or misconfigured RPC could return data from an arbitrary account — if it has the correct magic bytes and matches a known slab size, the SDK would parse it as a valid slab with attacker-controlled engine state
• getMarketsByAddress already has owner validation (PR fix(discovery): validate account owner in getMarketsByAddress #128), but fetchSlab (used directly by keepers and ADL bots) did not
• Fix: Added optional expectedOwner?: PublicKey parameter. When provided, validates info.owner.equals(expectedOwner) before returning. Fully backward compatible.

Test plan

• No new test failures (729 passed, same 16 pre-existing)
• Verify fetchSlab(conn, key, wrongOwner) throws with descriptive owner mismatch error
• Verify fetchSlab(conn, key) (no owner) still works as before

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Added optional ownership verification for enhanced data integrity. When enabled, the system now validates ownership and provides explicit error messages including expected versus actual ownership values, helping users quickly diagnose and resolve authentication issues.

[coderabbitai]

📝 Walkthrough

Walkthrough

The fetchSlab function in src/solana/slab.ts was enhanced with an optional expectedOwner parameter that validates the fetched Solana account's owner matches the provided public key, throwing an explicit error with base58 values on mismatch.

Changes

Cohort / File(s)	Summary
Owner Validation Enhancement src/solana/slab.ts	Added optional expectedOwner parameter to fetchSlab() function with validation logic that compares account owner against expected value and throws descriptive error on mismatch.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A slab that fetches with care and grace,
Now checks that owners are in their place,
No sneaky mismatches shall ever pass,
With validation bright, at last, at last! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: adding optional owner validation to the fetchSlab function, which is the core purpose of this security-hardening PR.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

🧹 Nitpick comments (1)

src/solana/slab.ts (1)

1602-1603: Consider adding a strict variant to avoid accidental non-validation at call sites.

Because validation is opt-in, callers can still unintentionally skip owner checks. A small follow-up (e.g., fetchSlabStrict(connection, slabPubkey, expectedOwner) wrapper) would make safer usage easier for keeper/ADL paths.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@src/solana/slab.ts` around lines 1602 - 1603, Add a strict wrapper that
enforces owner validation so callers can't accidentally skip it: create a new
function (e.g., fetchSlabStrict) that wraps the existing fetchSlab (or the
function taking slabPubkey and expectedOwner?) and requires expectedOwner to be
provided, performs the owner check, and throws an error if the slab owner is
missing or mismatches expectedOwner; update or document usages in keeper/ADL
paths to call fetchSlabStrict instead of the optional-validate variant to
guarantee validation.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@src/solana/slab.ts`:
- Around line 1602-1603: Add a strict wrapper that enforces owner validation so
callers can't accidentally skip it: create a new function (e.g.,
fetchSlabStrict) that wraps the existing fetchSlab (or the function taking
slabPubkey and expectedOwner?) and requires expectedOwner to be provided,
performs the owner check, and throws an error if the slab owner is missing or
mismatches expectedOwner; update or document usages in keeper/ADL paths to call
fetchSlabStrict instead of the optional-validate variant to guarantee
validation.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e94165d9-52c7-43c5-b464-d992c074b919

📥 Commits

Reviewing files that changed from the base of the PR and between 2f80d79 and 6d42fde.

📒 Files selected for processing (1)

• src/solana/slab.ts