Closes the second of two skipped tests in workspace_provision_test.go
that were blocked on interface refactors. The Broadcaster + CP
provisioner halves landed in earlier #1814 cycles; this is the
plugin-source-registry half.
Refactor:
- Add handlers.pluginSources interface with the 3 methods handler
code actually calls (Register, Resolve, Schemes)
- Compile-time assertion `var _ pluginSources = (*plugins.Registry)(nil)`
catches future method-signature drift at build time
- PluginsHandler.sources narrowed from *plugins.Registry to the
interface; production wiring (NewPluginsHandler, WithSourceResolver)
still passes *plugins.Registry — satisfies the interface
Production fix (#1206 leak):
- resolveAndStage's Fetch-failure path was interpolating err.Error()
into the HTTP response body via `failed to fetch plugin from %s: %v`.
Resolver errors routinely contain rate-limit text, github request
IDs, raw HTTP body fragments, and (for local resolvers) file system
paths — none has any business landing in a user's browser.
- Body now carries just `failed to fetch plugin from <scheme>`; the
status code already differentiates the failure shape (404 not
found, 504 timeout, 502 generic). Full err detail stays in the
server-side log line one statement above.
Test:
- 6 sub-tests covering every error path inside resolveAndStage:
empty source, invalid format, unknown scheme, local
path-traversal, unpinned github (PLUGIN_ALLOW_UNPINNED unset),
Fetch failure with a leaky synthetic error
- The Fetch-failure case plants 5 realistic leak markers in the
resolver's error string (rate limit text, x-github-request-id,
auth_token, ghp_-prefixed token, /etc/passwd path); the assertion
fails if ANY appears in the response body
- Table-driven so a future error path added to resolveAndStage gets
one new row, not a copy-paste of the assertion logic
Verification:
- 6/6 sub-tests pass
- Full workspace-server test suite passes (interface refactor is
non-breaking; production caller paths unchanged)
- go build ./... clean
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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