Implemented a centralized secret-backed object-store helper

internal/app/operator_helpers_test.go

@@ -3,6 +3,7 @@ package app
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
@@ -47,6 +48,49 @@ func TestExecuteSessionInitRemoteWritesCanonicalSessionConfig(t *testing.T) {
 	}
 }
 
+func TestExecuteSessionValidateLoadsSecretsBeforeObjectStoreInit(t *testing.T) {
+	workspaceRoot := t.TempDir()
+	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)
+	accessKeyEnv := "NARRATIO_TEST_VALIDATE_OBJECT_KEY_ID"
+	secretKeyEnv := "NARRATIO_TEST_VALIDATE_OBJECT_SECRET"
+	restoreEnvAfterTest(t, accessKeyEnv, secretKeyEnv)
+	secretsDir := t.TempDir()
+	mustWriteTestFile(t, filepath.Join(secretsDir, accessKeyEnv), "test-key-id\n")
+	mustWriteTestFile(t, filepath.Join(secretsDir, secretKeyEnv), "test-secret\n")
+	addSecretsToPipelineConfig(t, pipelinePath, secretsDir, accessKeyEnv, secretKeyEnv)
+	if err := os.WriteFile(sessionPath, []byte(`session_id: 2026-05-03
+inputs:
+  audio_s3:
+    prefix: audio/
+`), 0o644); err != nil {
+		t.Fatalf("write session: %v", err)
+	}
+
+	fake := &storage.FakeBackend{}
+	audioKey := artifacts.S3PromotedArtifactKey(artifacts.S3AudioPrefix(artifacts.S3SessionPrefix("dnd", "sample-campaign", "2026-05-03"), "audio/"), "alice.flac")
+	fake.SeedObject(storage.FakeObject{Key: audioKey, Data: []byte("audio")})
+	origStoreFn := newObjectStoreFromConfigFn
+	newObjectStoreFromConfigFn = func(context.Context, *config.Config) (storage.ObjectStore, error) {
+		if os.Getenv(accessKeyEnv) != "test-key-id" || os.Getenv(secretKeyEnv) != "test-secret" {
+			return nil, fmt.Errorf("secrets were not loaded before object store init")
+		}
+		return fake, nil
+	}
+	t.Cleanup(func() {
+		newObjectStoreFromConfigFn = origStoreFn
+	})
+
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+	code := Execute([]string{"session", "validate", "--config", pipelinePath, "--campaign", campaignPath, "--session", sessionPath}, &stdout, &stderr)
+	if code != 0 {
+		t.Fatalf("exit code = %d, want 0; stdout=%q stderr=%q", code, stdout.String(), stderr.String())
+	}
+	if !strings.Contains(stdout.String(), "OK    audio") {
+		t.Fatalf("stdout = %q, want OK audio", stdout.String())
+	}
+}
+
 func TestExecuteLockAndUnlockUseRemoteLockStore(t *testing.T) {
 	workspaceRoot := t.TempDir()
 	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)