#1483 flagged that dispatchA2A() doesn't call isSafeURL internally —
the guard exists only at the caller level (resolveAgentURL at
a2a_proxy.go:424). The primary call path through proxyA2ARequest
is safe today, but if any future code path ever calls dispatchA2A
directly without going through resolveAgentURL, the SSRF check
would be silently bypassed.
This adds the one-line defense-in-depth guard the issue prescribed:
if err := isSafeURL(agentURL); err != nil {
return nil, nil, &proxyDispatchBuildError{err: err}
}
Wrapping as *proxyDispatchBuildError preserves the existing caller
error-classification path — the same shape that maps to 500 elsewhere.
Adds TestDispatchA2A_RejectsUnsafeURL pinning the contract:
re-enables SSRF for the test (setupTestDB disables it for normal
unit tests), passes a metadata IP, asserts the build error returns
and cancel is nil so no resource is leaked.
The 4 existing dispatchA2A unit tests use setupTestDB → SSRF
disabled, so they continue passing unchanged.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
fd891a147e