Files
vdm/contracts/schema/methods/download.add.schema.json
T
samiandClaude Opus 5 53421d6cb8 proto: freeze the wire contract at 1.0.0
Schemas for the whole v1 surface: 38 methods, 9 events, 25 named types and the
JSON-RPC envelope, with x-privileged / x-transports / x-deadlineMs / x-errors
annotations that both generators emit as data rather than prose.

Four generators over one IR (contracts/codegen/schema_ir.py), so the C++ structs,
the TypeScript types and the OpenRPC document cannot disagree about what the
contract says:

  gen_cpp.py             -> core/generated/velox_proto.{hpp,cpp}
  gen_ts.py              -> extension/src/shared/protocol/
  gen_openrpc.py         -> contracts/openrpc.json
  gen_cpp_conformance.py -> tests/conformance/cpp/fixture_dispatcher.hpp

Inbound parsing never throws: parse<T>() returns std::expected<T, ParseError> and
nlohmann's throwing ADL from_json is deliberately not emitted. Schema constraints
(minimum, maxLength, pattern, ...) become real runtime checks in both languages —
the daemon does not trust the extension and the extension does not trust the
daemon.

59 golden fixtures: a success case per method, 12 error cases, 9 events. Replayed
by tests/conformance/ against both the generated C++ and a live server over both
transports. tools/mockd serves the same fixtures with unhappy-path flags so the
GUI and EXT lanes never wait for veloxd.

run.sh also proves capture.offer fails open: with a daemon answering slower than
750 ms the client gives up and lets Firefox take the download.

core/generated/ is libveloxproto, a separate target from libveloxcore, which
still never sees JSON — see docs/adr/0009.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_012fgjnqFCS5h5L7gZTZo3rV
2026-09-09 19:55:54 +04:00

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JSON

{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$id": "https://velox.dev/schema/methods/download.add.schema.json",
"title": "download.add",
"description": "Create one task. saveDir is canonicalized and checked against saveTo.allowedRoots before anything is written; a path that escapes them is refused with -32011 and no file is created.",
"x-privileged": false,
"x-transports": ["uds", "ws"],
"x-deadlineMs": 5000,
"x-errors": [-32011, -32012, -32013],
"x-wsRestrictions": ["saveDir must be absent or resolve inside an existing category folder; anything else is -32011. The extension may request a download, it may not choose an arbitrary destination."],
"type": "object",
"properties": {
"params": { "$ref": "https://velox.dev/schema/types/DownloadSpec.schema.json" },
"result": {
"type": "object",
"additionalProperties": false,
"required": ["taskId", "state"],
"properties": {
"taskId": { "type": "string", "format": "uuid" },
"state": { "$ref": "https://velox.dev/schema/types/TaskState.schema.json" },
"duplicate": { "type": ["string", "null"], "format": "uuid", "description": "The existing task this URL matched, when downloads.duplicatePolicy resolved to 'skip'. taskId then names that existing task." }
}
}
}
}