pdftract/notes/bf-2yu7r.md

Verification Note for bf-2yu7r: JSON-RPC Error Struct Implementation

Task

Implement JSON-RPC error struct in TH-05-ssrf-block.rs

Finding

The JsonRpcError struct is already fully implemented in the target file at lines 587-599.

Implementation Details

Location: /home/coding/pdftract/crates/pdftract-core/tests/TH-05-ssrf-block.rs:587-599

/// JSON-RPC 2.0 error object structure.
///
/// Represents the error field in a JSON-RPC response with code, message,
/// and optional data fields.
#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
pub struct JsonRpcError {
    /// The error code (negative for server errors in the -32099..-32000 range)
    pub code: i64,
    /// Human-readable error message
    pub message: String,
    /// Optional additional error data
    pub data: Option<serde_json::Value>,
}

Acceptance Criteria Verification

Criterion	Status	Notes
JsonRpcError struct exists with code, message, and optional data fields	PASS	All three fields present
Struct derives Deserialize and Debug	PASS	Derives Debug, Clone, Deserialize, Serialize
Error struct is used in the JsonRpcResponse error field	PASS	Used at line 634: pub error: Option<JsonRpcError>
Compiles without errors in TH-05-ssrf-block.rs	PASS	cargo check --tests --package pdftract-core --features remote successful (warnings only)

Additional Notes

1. Field Types: The code field is i64 (64-bit signed integer), which exceeds the bead specification of i32 or u32. This provides wider range for error codes and aligns with the JSON-RPC 2.0 spec which allows numbers beyond 32-bit ranges.

2. Extra Derives: The struct also derives Clone and Serialize (bonus functionality not explicitly requested).

3. Documentation: The struct includes comprehensive RustDoc comments explaining the purpose and field semantics.

4. Integration: The error struct is fully integrated with:

   • JsonRpcResponse<T> (line 634)
   • ToolCallResult enum (line 844)
   • Helper functions is_ssrf_blocked_error() and extract_error_info() (lines 684-732)

5. Test Coverage: The module includes unit tests for error parsing at lines 1084-1161 (mcp_helpers_tests module).

Compilation Verification

Command: cargo check --tests --package pdftract-core --features remote

Result: ✅ SUCCESS - No compilation errors (only unrelated warnings in other modules)

Conclusion

The JSON-RPC error struct implementation was already complete when this bead was claimed. No code changes were required. The existing implementation fully satisfies all acceptance criteria with additional quality improvements (extra derives, comprehensive documentation, test coverage).