[Feat]:: Implemented Oracle Contract Validation and Approved Oracle W…

[ryzen-xp]

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Pull Request Description

Close #53

📋 Basic Information

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 💥 Breaking change
• 📚 Documentation update
• 🧪 Test addition/update
• 🔧 Refactoring
• ⚡ Performance improvement
• 🔒 Security fix
• 🎨 UI/UX improvement
• 🚀 Deployment/Infrastructure change

Related Issues

Closes #53

Priority Level

• 🔴 Critical
• 🟡 High
• 🟢 Medium
• 🔵 Low

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📝 Detailed Description

What does this PR do?

This PR implements the Oracle Whitelist and Validation system for the Predictify Hybrid contracts.
Key additions include:

• OracleWhitelist struct for centralized oracle management.
• Functions for adding/removing oracles with admin-only access.
• Validation of oracle contract signatures and function compatibility.
• Oracle health check and metadata storage.
• get_approved_oracles() for fetching the active whitelist.
• Events for oracle addition/removal for audit trail.

Why is this change needed?

Previously, any address could be passed as an oracle, creating security risks (malicious or invalid oracle contracts).
This PR ensures that:

• Only verified oracles are used.
• Oracles pass signature validation, health checks, and version checks.
• Administrators maintain a single authoritative whitelist.

How was this tested?

• Added unit tests for:

  • Adding/removing oracles.
  • Rejecting duplicate entries.
  • Validation of whitelisted vs non-whitelisted oracles.
  • Edge cases such as removing non-existent oracles.

• Manual testing on local testnet.

• Verified events (oracle_whitelisted, oracle_removed) are emitted correctly.

Alternative Solutions Considered

• Iterating directly over storage for oracles (rejected due to Soroban’s lack of iteration APIs).
• Using only metadata flags without a list (rejected since it made retrieval inefficient).
• Final approach uses a Vec<Address> stored under OracleList for efficient lookup and retrieval.

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🏗️ Smart Contract Specific

Contract Changes

• Core contract logic modified
• Oracle integration changes
• New functions added
• Existing functions modified
• Storage structure changes
• Events added/modified
• Error handling improved
• Gas optimization
• Access control changes
• Admin functions modified
• Fee structure changes

Oracle Integration

• Oracle configuration changes
• Pyth oracle integration affected
• Reflector oracle integration affected
• Oracle fallback mechanisms
• Oracle validation logic

Market Resolution Logic

• Hybrid resolution algorithm changed
• Dispute mechanism modified
• Fee structure updated
• Voting mechanism changes
• Community weight calculation
• Oracle weight calculation

Security Considerations

• Access control reviewed
• Input validation
• Oracle manipulation protection
• Reentrancy protection
• Overflow/underflow protection

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🧪 Testing

Test Coverage

• Unit tests added/updated
• Integration tests updated
• All tests passing locally
• Manual testing completed
• Gas usage optimized

Test Results

cargo test
# Output: All 27 tests passed

Manual Testing Steps

1. Deploy contract on local testnet.
2. Call add_oracle_to_whitelist with admin → succeeds.
3. Call get_approved_oracles → returns correct list.
4. Attempt invalid oracle → rejected.
5. Remove oracle → validated and removed.

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📚 Documentation

Documentation Updates

• Code comments updated
• Architecture documentation updated
• README updated
• API documentation updated
• Deployment instructions updated

Breaking Changes

Breaking Changes:

• None (only adds new functionality).

Migration Guide:

• Existing deployments unaffected.

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🔍 Code Quality

• Code follows Rust/Soroban best practices
• No unnecessary duplication
• Error handling improved
• Events for auditing added
• Self-review completed

Performance Impact:

• Gas Usage: Minimal increase due to validation logic.
• Storage Impact: Additional vector of approved oracle addresses.

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🚀 Deployment & Integration

Deployment Notes

• Network: Testnet deployment planned.
• Migration Required: No.
• Special Instructions: None.

Integration Points

• Backward compatibility maintained
• Frontend can now fetch approved oracles via get_approved_oracles.

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📊 Impact Assessment

User Impact

• End Users: More secure oracle feeds.
• Developers: Cleaner API for oracle validation.
• Admins: Centralized control over oracle approval.

Business Impact

• Security: Stronger protection from malicious contracts.
• Reliability: Validated oracle feeds ensure correct market outcomes.

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✅ Final Checklist

• All CI checks passing
• Tests included and passing
• Documentation updated
• PR description complete

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💬 Notes for Reviewers

Please focus on:

• Correctness of get_approved_oracles logic.
• Efficiency of whitelist storage.
• Event emissions for monitoring and auditing.

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⚡ This PR secures the oracle pipeline by introducing a robust validation and whitelist system, closing #53.

[ryzen-xp]

[greatest0fallt1me]

LGTM! @ryzen-xp