Merge pull request 'feat: render runtime secret GitOps' (#48) from feat/app-secret-gitops into main

Reviewed-on: #48

internal/bootstrap/onboard.go

@@ -52,7 +52,10 @@ func OnboardApp(cfg config.Config, sourceDir string) error {
 		return fmt.Errorf("protect Forgejo production branch: %w", err)
 	}
 	changed, err := manager.PublishDeliveryBranch(sourceDir, sourceBranch, resolved.Delivery.AppRepoURL, deliveryBranch, func(dir string) error {
-		return GenerateAppDelivery(dir, resolved)
+		if err := GenerateAppDelivery(dir, resolved); err != nil {
+			return err
+		}
+		return GenerateAppSecretAccess(dir, resolved)
 	})
 	if err != nil {
 		return err
@@ -205,7 +208,7 @@ func renderAppRegistration(cfg config.Config) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	return []byte(fmt.Sprintf(`apiVersion: source.toolkit.fluxcd.io/v1
+	content := fmt.Sprintf(`apiVersion: source.toolkit.fluxcd.io/v1
 kind: GitRepository
 metadata:
   name: %s
@@ -234,7 +237,104 @@ spec:
   sourceRef:
 	   kind: GitRepository
 	   name: %s
-`, cfg.Delivery.AppName, cfg.Delivery.AppRepoURL, branch, cfg.Delivery.AppName, cfg.Delivery.AppName)), nil
+`, cfg.Delivery.AppName, cfg.Delivery.AppRepoURL, branch, cfg.Delivery.AppName, cfg.Delivery.AppName)
+	if hasRuntimeSecretGrant(cfg) {
+		content += fmt.Sprintf(`---
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: %s-secrets
+  namespace: flux-system
+spec:
+  interval: 5m
+  path: ./.maidn
+  prune: true
+  wait: true
+  dependsOn:
+    - name: external-secrets-config
+  sourceRef:
+    kind: GitRepository
+    name: %s
+`, cfg.Delivery.AppName, cfg.Delivery.AppName)
+	}
+	return []byte(content), nil
+}
+
+func hasRuntimeSecretGrant(cfg config.Config) bool {
+	for _, grant := range cfg.SecretGrants {
+		if grant.Application == cfg.Delivery.AppName && grant.Consumer == "runtime" {
+			return true
+		}
+	}
+	return false
+}
+
+// GenerateAppSecretAccess renders only OpenBao references, never secret values.
+func GenerateAppSecretAccess(dir string, cfg config.Config) error {
+	if err := config.ValidateSecretGrants(cfg.SecretGrants); err != nil {
+		return err
+	}
+	var manifests string
+	for _, grant := range cfg.SecretGrants {
+		if grant.Application != cfg.Delivery.AppName || grant.Consumer != "runtime" {
+			continue
+		}
+		name := cfg.Delivery.AppName + "-runtime-" + grant.Environment
+		manifests += fmt.Sprintf(`apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: maidn-%s
+  namespace: %s
+---
+apiVersion: external-secrets.io/v1
+kind: SecretStore
+metadata:
+  name: openbao-%s
+  namespace: %s
+spec:
+  provider:
+    vault:
+      server: http://openbao.openbao.svc:8200
+      path: secret
+      version: v2
+      auth:
+        kubernetes:
+          mountPath: kubernetes
+          role: maidn-%s
+          serviceAccountRef:
+            name: maidn-%s
+---
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: %s
+  namespace: %s
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    kind: SecretStore
+    name: openbao-%s
+  target:
+    name: %s
+    creationPolicy: Owner
+  data:
+`, name, grant.Environment, name, grant.Environment, name, name, name, grant.Environment, name, name)
+		for _, secret := range grant.Secrets {
+			manifests += fmt.Sprintf("    - secretKey: %s\n      remoteRef:\n        key: apps/%s/%s\n        property: value\n", secret, grant.Application, secret)
+		}
+		manifests += "---\n"
+	}
+	if manifests == "" {
+		return nil
+	}
+	maidnDir := filepath.Join(dir, ".maidn")
+	if err := os.MkdirAll(maidnDir, 0755); err != nil {
+		return err
+	}
+	if err := os.WriteFile(filepath.Join(maidnDir, "kustomization.yaml"), []byte("apiVersion: kustomize.config.k8s.io/v1beta1\nkind: Kustomization\nresources:\n  - secret-access.yaml\n"), 0644); err != nil {
+		return err
+	}
+	return os.WriteFile(filepath.Join(maidnDir, "secret-access.yaml"), []byte(manifests), 0644)
 }
 
 func readRegularFile(path string) ([]byte, error) {

internal/bootstrap/onboard_test.go

@@ -111,6 +111,23 @@ func TestRegisterAppInClusterRendersManagedFluxSource(t *testing.T) {
 	}
 }
 
+func TestGenerateAppSecretAccessRendersOnlyDeclaredRuntimeSecrets(t *testing.T) {
+	dir := t.TempDir()
+	cfg := onboardingConfig()
+	cfg.SecretGrants = []config.SecretGrant{{Application: "web-ui", Consumer: "runtime", Environment: "staging", Secrets: []string{"api-key"}, Shared: []string{"payments"}}}
+	if err := GenerateAppSecretAccess(dir, cfg); err != nil {
+		t.Fatal(err)
+	}
+	access, err := os.ReadFile(filepath.Join(dir, ".maidn", "secret-access.yaml"))
+	if err != nil || !strings.Contains(string(access), "namespace: staging") || !strings.Contains(string(access), "key: apps/web-ui/api-key") || strings.Contains(string(access), "shared/payments") {
+		t.Fatalf("secret access = %q, %v", access, err)
+	}
+	registration, err := renderAppRegistration(cfg)
+	if err != nil || !strings.Contains(string(registration), "name: web-ui-secrets") || !strings.Contains(string(registration), "path: ./.maidn") {
+		t.Fatalf("secret registration = %q, %v", registration, err)
+	}
+}
+
 func TestPublishInitialAppBranchesCreatesAndPreservesProduction(t *testing.T) {
 	source := filepath.Join(t.TempDir(), "source")
 	target := filepath.Join(t.TempDir(), "target.git")