feat: add web push notifications and file drop

Web Push:
- WebPushNotifier with VAPID auth; urgency mapped to event type
  (BLOCKED=urgent, FAILED=high, COMPLETED=low)
- Auto-generates VAPID keys on first serve, persists to config file
- push_subscriptions table in SQLite (upsert by endpoint)
- GET /api/push/vapid-key, POST/DELETE /api/push/subscribe endpoints
- Service worker (sw.js) handles push events and notification clicks
- Notification bell button in web UI; subscribes on click

File Drop:
- GET /api/drops, GET /api/drops/{filename}, POST /api/drops
- Persistent ~/.claudomator/drops/ directory
- CLAUDOMATOR_DROP_DIR env var passed to agent subprocesses
- Drops tab (📁) in web UI with file listing and download links

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 159 insertions, 0 deletions

diff --git a/internal/api/drops_test.go b/internal/api/drops_test.go
new file mode 100644
index 0000000..ab67489
--- /dev/null
+++ b/internal/api/drops_test.go
@@ -0,0 +1,159 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"mime/multipart"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func testServerWithDrops(t *testing.T) (*Server, string) {
+	t.Helper()
+	srv, _ := testServer(t)
+	dropsDir := t.TempDir()
+	srv.SetDropsDir(dropsDir)
+	return srv, dropsDir
+}
+
+func TestHandleListDrops_Empty(t *testing.T) {
+	srv, _ := testServerWithDrops(t)
+
+	req := httptest.NewRequest("GET", "/api/drops", nil)
+	rec := httptest.NewRecorder()
+	srv.mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("want 200, got %d", rec.Code)
+	}
+
+	var files []map[string]interface{}
+	if err := json.NewDecoder(rec.Body).Decode(&files); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+	if len(files) != 0 {
+		t.Errorf("want empty list, got %d entries", len(files))
+	}
+}
+
+func TestHandleListDrops_WithFile(t *testing.T) {
+	srv, dropsDir := testServerWithDrops(t)
+
+	// Create a file in the drops dir.
+	if err := os.WriteFile(filepath.Join(dropsDir, "hello.txt"), []byte("world"), 0600); err != nil {
+		t.Fatal(err)
+	}
+
+	req := httptest.NewRequest("GET", "/api/drops", nil)
+	rec := httptest.NewRecorder()
+	srv.mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("want 200, got %d: %s", rec.Code, rec.Body.String())
+	}
+
+	var files []map[string]interface{}
+	if err := json.NewDecoder(rec.Body).Decode(&files); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+	if len(files) != 1 {
+		t.Fatalf("want 1 file, got %d", len(files))
+	}
+	if files[0]["name"] != "hello.txt" {
+		t.Errorf("name: want %q, got %v", "hello.txt", files[0]["name"])
+	}
+}
+
+func TestHandlePostDrop_Multipart(t *testing.T) {
+	srv, dropsDir := testServerWithDrops(t)
+
+	var buf bytes.Buffer
+	w := multipart.NewWriter(&buf)
+	fw, err := w.CreateFormFile("file", "test.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	fw.Write([]byte("hello world")) //nolint:errcheck
+	w.Close()
+
+	req := httptest.NewRequest("POST", "/api/drops", &buf)
+	req.Header.Set("Content-Type", w.FormDataContentType())
+	rec := httptest.NewRecorder()
+	srv.mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusCreated {
+		t.Fatalf("want 201, got %d: %s", rec.Code, rec.Body.String())
+	}
+
+	var resp map[string]interface{}
+	if err := json.NewDecoder(rec.Body).Decode(&resp); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+	if resp["name"] != "test.txt" {
+		t.Errorf("name: want %q, got %v", "test.txt", resp["name"])
+	}
+
+	// Verify file was created on disk.
+	content, err := os.ReadFile(filepath.Join(dropsDir, "test.txt"))
+	if err != nil {
+		t.Fatalf("reading uploaded file: %v", err)
+	}
+	if string(content) != "hello world" {
+		t.Errorf("content: want %q, got %q", "hello world", content)
+	}
+}
+
+func TestHandleGetDrop_Download(t *testing.T) {
+	srv, dropsDir := testServerWithDrops(t)
+
+	if err := os.WriteFile(filepath.Join(dropsDir, "download.txt"), []byte("download me"), 0600); err != nil {
+		t.Fatal(err)
+	}
+
+	req := httptest.NewRequest("GET", "/api/drops/download.txt", nil)
+	rec := httptest.NewRecorder()
+	srv.mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("want 200, got %d", rec.Code)
+	}
+
+	cd := rec.Header().Get("Content-Disposition")
+	if !strings.Contains(cd, "attachment") {
+		t.Errorf("want Content-Disposition: attachment, got %q", cd)
+	}
+	if rec.Body.String() != "download me" {
+		t.Errorf("body: want %q, got %q", "download me", rec.Body.String())
+	}
+}
+
+func TestHandleGetDrop_PathTraversal(t *testing.T) {
+	srv, _ := testServerWithDrops(t)
+
+	// Attempt path traversal — should be rejected.
+	req := httptest.NewRequest("GET", "/api/drops/..%2Fetc%2Fpasswd", nil)
+	rec := httptest.NewRecorder()
+	srv.mux.ServeHTTP(rec, req)
+
+	// The Go net/http router will handle %2F-encoded slashes as literal characters,
+	// so the filename becomes "../etc/passwd". Our handler should reject it.
+	if rec.Code == http.StatusOK {
+		t.Error("expected non-200 for path traversal attempt")
+	}
+}
+
+func TestHandleGetDrop_NotFound(t *testing.T) {
+	srv, _ := testServerWithDrops(t)
+
+	req := httptest.NewRequest("GET", "/api/drops/notexist.txt", nil)
+	rec := httptest.NewRecorder()
+	srv.mux.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusNotFound {
+		t.Fatalf("want 404, got %d", rec.Code)
+	}
+}