feat(modpacks): implement simple zip importer and API

internal/api/modpack_handler.go

@@ -0,0 +1,68 @@
+package api
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+
+	"gitea.mrixs.me/minecraft-platform/backend/internal/core/importer"
+	"gitea.mrixs.me/minecraft-platform/backend/internal/database"
+	"gitea.mrixs.me/minecraft-platform/backend/internal/models"
+)
+
+type ModpackHandler struct {
+	ModpackRepo *database.ModpackRepository
+}
+
+func (h *ModpackHandler) ImportModpack(w http.ResponseWriter, r *http.Request) {
+	if err := r.ParseMultipartForm(512 << 20); err != nil { // 512 MB лимит
+		http.Error(w, "File too large", http.StatusBadRequest)
+		return
+	}
+
+	file, _, err := r.FormFile("file")
+	if err != nil {
+		http.Error(w, "Invalid file upload", http.StatusBadRequest)
+		return
+	}
+	defer file.Close()
+
+	tempFile, err := os.CreateTemp("", "modpack-*.zip")
+	if err != nil {
+		http.Error(w, "Could not create temp file", http.StatusInternalServerError)
+		return
+	}
+	defer os.Remove(tempFile.Name())
+	defer tempFile.Close()
+
+	_, err = io.Copy(tempFile, file)
+	if err != nil {
+		http.Error(w, "Could not save temp file", http.StatusInternalServerError)
+		return
+	}
+
+	storagePath := os.Getenv("MODPACKS_STORAGE_PATH")
+	imp := &importer.SimpleZipImporter{StoragePath: storagePath}
+
+	files, err := imp.Import(tempFile.Name())
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Import failed: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	modpack := &models.Modpack{
+		Name:             r.FormValue("name"),
+		DisplayName:      r.FormValue("displayName"),
+		MinecraftVersion: r.FormValue("mcVersion"),
+	}
+
+	err = h.ModpackRepo.CreateModpackTx(r.Context(), modpack, files)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Database save failed: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusCreated)
+	fmt.Fprintf(w, "Modpack '%s' imported successfully with %d files.", modpack.DisplayName, len(files))
+}