Add local decision log

internal/audit/log_test.go

@@ -0,0 +1,59 @@
+package audit_test
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/netkingdom/flex-auth/internal/audit"
+	"github.com/netkingdom/flex-auth/pkg/api"
+)
+
+func TestJSONLDecisionLogRoundTripsDecisions(t *testing.T) {
+	log := audit.NewJSONLDecisionLog(filepath.Join(t.TempDir(), "decisions.jsonl"))
+
+	first := api.DecisionEnvelope{
+		ID:     "decision:allow",
+		Effect: api.DecisionEffectAllow,
+		Reason: "reader_relation",
+		Subject: api.SubjectRef{
+			ID: "user:alice",
+		},
+		Resource: api.ResourceRef{
+			ID: "document:internal-note",
+		},
+		Provenance: api.DecisionProvenance{
+			Evaluator: "flex-auth/local",
+			Mode:      "standalone",
+		},
+	}
+	second := first
+	second.ID = "decision:deny"
+	second.Effect = api.DecisionEffectDeny
+	second.Reason = "no_matching_rule"
+
+	if err := log.Append(first); err != nil {
+		t.Fatalf("Append first: %v", err)
+	}
+	if err := log.Append(second); err != nil {
+		t.Fatalf("Append second: %v", err)
+	}
+
+	got, err := log.ReadAll()
+	if err != nil {
+		t.Fatalf("ReadAll: %v", err)
+	}
+	if len(got) != 2 {
+		t.Fatalf("len(got) = %d; want 2", len(got))
+	}
+	if got[0].ID != first.ID || got[1].ID != second.ID {
+		t.Fatalf("ids = %q/%q; want %q/%q", got[0].ID, got[1].ID, first.ID, second.ID)
+	}
+
+	found, ok, err := log.Find("decision:deny")
+	if err != nil {
+		t.Fatalf("Find: %v", err)
+	}
+	if !ok || found.Effect != api.DecisionEffectDeny {
+		t.Fatalf("Find decision:deny = %+v, %v; want deny", found, ok)
+	}
+}