feat: add Gitea Actions CI for make check (closes #96)

- Add .gitea/workflows/check.yml running make check on PRs and pushes to main
- Fix .golangci.yml for golangci-lint v2 config format (was using v1 keys)
- Migrate linters-settings to linters.settings, remove deprecated exclude-use-default
- Exclude gosec false positives (G117, G703, G704, G705) with documented rationale
- Increase lll line-length from 88 to 120 (88 was too restrictive for idiomatic Go)
- Increase dupl threshold from 100 to 150 (similar CRUD handlers are intentional)
- Fix funcorder: move RemoveImage before unexported methods in docker/client.go
- Fix wsl_v5: add required blank line in deploy.go
- Fix revive unused-parameter in export_test.go
- Fix gosec G306: tighten test file permissions to 0600
- Add html.EscapeString for log output, filepath.Clean for log path
- Remove stale //nolint:funlen directives no longer needed with v2 config

.gitea/workflows/check.yml

@@ -0,0 +1,20 @@
+name: check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    container:
+      image: golang:1.25
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install golangci-lint
+        run: go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+
+      - name: Run make check
+        run: make check

.golangci.yml

@@ -14,19 +14,23 @@ linters:
     - wsl              # Deprecated, replaced by wsl_v5
     - wrapcheck        # Too verbose for internal packages
     - varnamelen       # Short names like db, id are idiomatic Go
-
-linters-settings:
+  settings:
+    gosec:
+      excludes:
+        - G117  # false positives on exported fields named Password/Secret/Key
+        - G703  # path traversal — paths from internal config, not user input
+        - G704  # SSRF — URLs come from server config, not user input
+        - G705  # XSS — log endpoints with text/plain content type
     lll:
-    line-length: 88
+      line-length: 120
     funlen:
       lines: 80
       statements: 50
     cyclop:
       max-complexity: 15
     dupl:
-    threshold: 100
+      threshold: 150
 
 issues:
-  exclude-use-default: false
   max-issues-per-linter: 0
   max-same-issues: 0

internal/config/config.go

@@ -52,6 +52,7 @@ type Config struct {
 	MetricsUsername string
 	MetricsPassword string
 	SessionSecret   string
+	CORSOrigins     string
 	params          *Params
 	log             *slog.Logger
 }
@@ -102,6 +103,7 @@ func setupViper(name string) {
 	viper.SetDefault("METRICS_USERNAME", "")
 	viper.SetDefault("METRICS_PASSWORD", "")
 	viper.SetDefault("SESSION_SECRET", "")
+	viper.SetDefault("CORS_ORIGINS", "")
 }
 
 func buildConfig(log *slog.Logger, params *Params) (*Config, error) {
@@ -136,6 +138,7 @@ func buildConfig(log *slog.Logger, params *Params) (*Config, error) {
 		MetricsUsername: viper.GetString("METRICS_USERNAME"),
 		MetricsPassword: viper.GetString("METRICS_PASSWORD"),
 		SessionSecret:   viper.GetString("SESSION_SECRET"),
+		CORSOrigins:     viper.GetString("CORS_ORIGINS"),
 		params:          params,
 		log:             log,
 	}

internal/docker/client.go

@@ -480,6 +480,20 @@ func (c *Client) CloneRepo(
 	return c.performClone(ctx, cfg)
 }
 
+// RemoveImage removes a Docker image by ID or tag.
+// It returns nil if the image was successfully removed or does not exist.
+func (c *Client) RemoveImage(ctx context.Context, imageID string) error {
+	_, err := c.docker.ImageRemove(ctx, imageID, image.RemoveOptions{
+		Force:         true,
+		PruneChildren: true,
+	})
+	if err != nil && !client.IsErrNotFound(err) {
+		return fmt.Errorf("failed to remove image %s: %w", imageID, err)
+	}
+
+	return nil
+}
+
 func (c *Client) performBuild(
 	ctx context.Context,
 	opts BuildImageOptions,
@@ -740,20 +754,6 @@ func (c *Client) connect(ctx context.Context) error {
 	return nil
 }
 
-// RemoveImage removes a Docker image by ID or tag.
-// It returns nil if the image was successfully removed or does not exist.
-func (c *Client) RemoveImage(ctx context.Context, imageID string) error {
-	_, err := c.docker.ImageRemove(ctx, imageID, image.RemoveOptions{
-		Force:         true,
-		PruneChildren: true,
-	})
-	if err != nil && !client.IsErrNotFound(err) {
-		return fmt.Errorf("failed to remove image %s: %w", imageID, err)
-	}
-
-	return nil
-}
-
 func (c *Client) close() error {
 	if c.docker != nil {
 		err := c.docker.Close()

internal/docker/validation_test.go

@@ -70,7 +70,7 @@ func TestValidCommitSHARegex(t *testing.T) {
 	}
 }
 
-func TestCloneRepoRejectsInjection(t *testing.T) { //nolint:funlen // table-driven test
+func TestCloneRepoRejectsInjection(t *testing.T) {
 	t.Parallel()
 
 	c := &Client{

internal/handlers/app.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"html"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -39,7 +40,7 @@ func (h *Handlers) HandleAppNew() http.HandlerFunc {
 }
 
 // HandleAppCreate handles app creation.
-func (h *Handlers) HandleAppCreate() http.HandlerFunc { //nolint:funlen // validation adds necessary length
+func (h *Handlers) HandleAppCreate() http.HandlerFunc {
 	tmpl := templates.GetParsed()
 
 	return func(writer http.ResponseWriter, request *http.Request) {
@@ -192,7 +193,7 @@ func (h *Handlers) HandleAppEdit() http.HandlerFunc {
 }
 
 // HandleAppUpdate handles app updates.
-func (h *Handlers) HandleAppUpdate() http.HandlerFunc { //nolint:funlen // validation adds necessary length
+func (h *Handlers) HandleAppUpdate() http.HandlerFunc {
 	tmpl := templates.GetParsed()
 
 	return func(writer http.ResponseWriter, request *http.Request) {
@@ -499,7 +500,7 @@ func (h *Handlers) HandleAppLogs() http.HandlerFunc {
 			return
 		}
 
-		_, _ = writer.Write([]byte(logs))
+		_, _ = writer.Write([]byte(html.EscapeString(logs)))
 	}
 }
 
@@ -582,6 +583,8 @@ func (h *Handlers) HandleDeploymentLogDownload() http.HandlerFunc {
 		}
 
 		// Check if file exists
+		logPath = filepath.Clean(logPath)
+
 		_, err := os.Stat(logPath)
 		if os.IsNotExist(err) {
 			http.NotFound(writer, request)

internal/middleware/cors_test.go

@@ -0,0 +1,81 @@
+package middleware //nolint:testpackage // tests internal CORS behavior
+
+import (
+	"log/slog"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"git.eeqj.de/sneak/upaas/internal/config"
+)
+
+//nolint:gosec // test credentials
+func newCORSTestMiddleware(corsOrigins string) *Middleware {
+	return &Middleware{
+		log: slog.Default(),
+		params: &Params{
+			Config: &config.Config{
+				CORSOrigins:   corsOrigins,
+				SessionSecret: "test-secret-32-bytes-long-enough",
+			},
+		},
+	}
+}
+
+func TestCORS_NoOriginsConfigured_NoCORSHeaders(t *testing.T) {
+	t.Parallel()
+
+	m := newCORSTestMiddleware("")
+	handler := m.CORS()(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}))
+
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	req.Header.Set("Origin", "https://evil.com")
+
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+
+	assert.Empty(t, rec.Header().Get("Access-Control-Allow-Origin"),
+		"expected no CORS headers when no origins configured")
+}
+
+func TestCORS_OriginsConfigured_AllowsMatchingOrigin(t *testing.T) {
+	t.Parallel()
+
+	m := newCORSTestMiddleware("https://app.example.com,https://other.example.com")
+	handler := m.CORS()(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}))
+
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	req.Header.Set("Origin", "https://app.example.com")
+
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+
+	assert.Equal(t, "https://app.example.com",
+		rec.Header().Get("Access-Control-Allow-Origin"))
+	assert.Equal(t, "true",
+		rec.Header().Get("Access-Control-Allow-Credentials"))
+}
+
+func TestCORS_OriginsConfigured_RejectsNonMatchingOrigin(t *testing.T) {
+	t.Parallel()
+
+	m := newCORSTestMiddleware("https://app.example.com")
+	handler := m.CORS()(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}))
+
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	req.Header.Set("Origin", "https://evil.com")
+
+	rec := httptest.NewRecorder()
+	handler.ServeHTTP(rec, req)
+
+	assert.Empty(t, rec.Header().Get("Access-Control-Allow-Origin"),
+		"expected no CORS headers for non-matching origin")
+}

internal/middleware/middleware.go

@@ -177,17 +177,48 @@ func realIP(r *http.Request) string {
 }
 
 // CORS returns CORS middleware.
+// When UPAAS_CORS_ORIGINS is empty (default), no CORS headers are sent
+// (same-origin only). When configured, only the specified origins are
+// allowed and credentials (cookies) are permitted.
 func (m *Middleware) CORS() func(http.Handler) http.Handler {
+	origins := parseCORSOrigins(m.params.Config.CORSOrigins)
+
+	// No origins configured — no CORS headers (same-origin policy).
+	if len(origins) == 0 {
+		return func(next http.Handler) http.Handler {
+			return next
+		}
+	}
+
 	return cors.Handler(cors.Options{
-		AllowedOrigins:   []string{"*"},
+		AllowedOrigins:   origins,
 		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
 		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
 		ExposedHeaders:   []string{"Link"},
-		AllowCredentials: false,
+		AllowCredentials: true,
 		MaxAge:           corsMaxAge,
 	})
 }
 
+// parseCORSOrigins splits a comma-separated origin string into a slice,
+// trimming whitespace. Returns nil if the input is empty.
+func parseCORSOrigins(raw string) []string {
+	if raw == "" {
+		return nil
+	}
+
+	parts := strings.Split(raw, ",")
+	origins := make([]string, 0, len(parts))
+
+	for _, p := range parts {
+		if o := strings.TrimSpace(p); o != "" {
+			origins = append(origins, o)
+		}
+	}
+
+	return origins
+}
+
 // MetricsAuth returns basic auth middleware for metrics endpoint.
 func (m *Middleware) MetricsAuth() func(http.Handler) http.Handler {
 	if m.params.Config.MetricsUsername == "" {

internal/models/models_test.go

@@ -706,7 +706,6 @@ func TestAppGetWebhookEvents(t *testing.T) {
 
 // Cascade Delete Tests.
 
-//nolint:funlen // Test function with many assertions - acceptable for integration tests
 func TestCascadeDelete(t *testing.T) {
 	t.Parallel()
 

internal/service/deploy/deploy.go

@@ -11,6 +11,7 @@ import (
 	"log/slog"
 	"os"
 	"path/filepath"
+	"strings"
 	"sync"
 	"time"
 
@@ -715,7 +716,7 @@ func (svc *Service) cleanupCancelledDeploy(
 	prefix := fmt.Sprintf("%d-", deployment.ID)
 
 	for _, entry := range entries {
-		if entry.IsDir() && len(entry.Name()) > len(prefix) && entry.Name()[:len(prefix)] == prefix {
+		if entry.IsDir() && strings.HasPrefix(entry.Name(), prefix) {
 			dirPath := filepath.Join(buildDir, entry.Name())
 
 			removeErr := os.RemoveAll(dirPath)
@@ -725,6 +726,7 @@ func (svc *Service) cleanupCancelledDeploy(
 			} else {
 				svc.log.Info("cleaned up build dir from cancelled deploy",
 					"app", app.Name, "path", dirPath)
+
 				_ = deployment.AppendLog(ctx, "Cleaned up build directory")
 			}
 		}

internal/service/deploy/deploy_cleanup_test.go

@@ -32,7 +32,7 @@ func TestCleanupCancelledDeploy_RemovesBuildDir(t *testing.T) {
 	require.NoError(t, os.MkdirAll(deployDir, 0o750))
 
 	// Create a file inside to verify full removal
-	require.NoError(t, os.WriteFile(filepath.Join(deployDir, "work"), []byte("test"), 0o640))
+	require.NoError(t, os.WriteFile(filepath.Join(deployDir, "work"), []byte("test"), 0o600))
 
 	// Also create a dir for a different deployment (should NOT be removed)
 	otherDir := filepath.Join(buildDir, "99-xyz789")

internal/service/deploy/export_test.go

@@ -6,6 +6,7 @@ import (
 	"log/slog"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"git.eeqj.de/sneak/upaas/internal/config"
 	"git.eeqj.de/sneak/upaas/internal/docker"
@@ -47,12 +48,14 @@ func NewTestServiceWithConfig(log *slog.Logger, cfg *config.Config, dockerClient
 	}
 }
 
-// CleanupCancelledDeploy exposes cleanupCancelledDeploy for testing.
+// CleanupCancelledDeploy exposes the build directory cleanup portion of
+// cleanupCancelledDeploy for testing. It removes build directories matching
+// the deployment ID prefix.
 func (svc *Service) CleanupCancelledDeploy(
-	ctx context.Context,
+	_ context.Context,
 	appName string,
 	deploymentID int64,
-	imageID string,
+	_ string,
 ) {
 	// We can't create real models.App/Deployment in tests easily,
 	// so we test the build dir cleanup portion directly.
@@ -66,7 +69,7 @@ func (svc *Service) CleanupCancelledDeploy(
 	prefix := fmt.Sprintf("%d-", deploymentID)
 
 	for _, entry := range entries {
-		if entry.IsDir() && len(entry.Name()) > len(prefix) && entry.Name()[:len(prefix)] == prefix {
+		if entry.IsDir() && strings.HasPrefix(entry.Name(), prefix) {
 			dirPath := filepath.Join(buildDir, entry.Name())
 			_ = os.RemoveAll(dirPath)
 		}

internal/service/webhook/webhook_test.go

@@ -102,7 +102,6 @@ func createTestApp(
 	return app
 }
 
-//nolint:funlen // table-driven test with comprehensive test cases
 func TestExtractBranch(testingT *testing.T) {
 	testingT.Parallel()