Inital build

backend/workers/tasks.go

@@ -0,0 +1,255 @@
+package workers
+
+import (
+	"archive/zip"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"git.elijahkuntz.com/Elijah/drive/config"
+	"github.com/google/uuid"
+)
+
+type TaskStatus string
+
+const (
+	TaskPending   TaskStatus = "pending"
+	TaskRunning   TaskStatus = "running"
+	TaskCompleted TaskStatus = "completed"
+	TaskFailed    TaskStatus = "failed"
+)
+
+type BackgroundTask struct {
+	ID        string     `json:"id"`
+	Type      string     `json:"type"` // "zip" or "unzip"
+	Status    TaskStatus `json:"status"`
+	Progress  int        `json:"progress"` // 0-100
+	Message   string     `json:"message"`
+	Error     string     `json:"error,omitempty"`
+	CreatedAt time.Time  `json:"created_at"`
+}
+
+type TaskManager struct {
+	Tasks map[string]*BackgroundTask
+	mu    sync.RWMutex
+	cfg   *config.Config
+}
+
+var Tasks *TaskManager
+
+func InitTaskManager(cfg *config.Config) {
+	Tasks = &TaskManager{
+		Tasks: make(map[string]*BackgroundTask),
+		cfg:   cfg,
+	}
+}
+
+func (m *TaskManager) CreateTask(taskType string, message string) *BackgroundTask {
+	id := uuid.New().String()
+	task := &BackgroundTask{
+		ID:        id,
+		Type:      taskType,
+		Status:    TaskPending,
+		Progress:  0,
+		Message:   message,
+		CreatedAt: time.Now(),
+	}
+
+	m.mu.Lock()
+	m.Tasks[id] = task
+	m.mu.Unlock()
+
+	return task
+}
+
+func (m *TaskManager) UpdateTask(id string, status TaskStatus, progress int, msg string) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if task, exists := m.Tasks[id]; exists {
+		task.Status = status
+		task.Progress = progress
+		if msg != "" {
+			task.Message = msg
+		}
+	}
+}
+
+func (m *TaskManager) FailTask(id string, err error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if task, exists := m.Tasks[id]; exists {
+		task.Status = TaskFailed
+		task.Error = err.Error()
+	}
+}
+
+func (m *TaskManager) GetTasks() []BackgroundTask {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	
+	// Convert map to sorted slice (newest first)
+	var list []BackgroundTask
+	for _, t := range m.Tasks {
+		list = append(list, *t)
+	}
+	return list
+}
+
+func (m *TaskManager) CleanOldTasks() {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	
+	for id, t := range m.Tasks {
+		if (t.Status == TaskCompleted || t.Status == TaskFailed) && time.Since(t.CreatedAt) > 24*time.Hour {
+			delete(m.Tasks, id)
+		}
+	}
+}
+
+// --- ZIP / UNZIP Logic ---
+
+func ZipFolderAsync(taskID string, sourceFull, destFull string) {
+	Tasks.UpdateTask(taskID, TaskRunning, 0, "Counting files...")
+	
+	// Count total files for progress calculation
+	var totalFiles int
+	filepath.Walk(sourceFull, func(_ string, info os.FileInfo, err error) error {
+		if err == nil && !info.IsDir() {
+			totalFiles++
+		}
+		return nil
+	})
+
+	if totalFiles == 0 {
+		Tasks.FailTask(taskID, fmt.Errorf("folder is empty"))
+		return
+	}
+
+	Tasks.UpdateTask(taskID, TaskRunning, 5, "Creating archive...")
+
+	// Create zip file
+	zipFile, err := os.Create(destFull)
+	if err != nil {
+		Tasks.FailTask(taskID, err)
+		return
+	}
+	defer zipFile.Close()
+
+	archive := zip.NewWriter(zipFile)
+	defer archive.Close()
+
+	var processedFiles int
+
+	filepath.Walk(sourceFull, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		// Calculate relative path inside the zip
+		relPath, err := filepath.Rel(filepath.Dir(sourceFull), path)
+		if err != nil {
+			return err
+		}
+
+		if info.IsDir() {
+			// Create directory entry
+			_, err = archive.Create(relPath + "/")
+			return err
+		}
+
+		// Add file
+		file, err := os.Open(path)
+		if err != nil {
+			return err
+		}
+		defer file.Close()
+
+		w, err := archive.Create(relPath)
+		if err != nil {
+			return err
+		}
+
+		_, err = io.Copy(w, file)
+		if err != nil {
+			return err
+		}
+
+		processedFiles++
+		progress := 5 + int(float64(processedFiles)/float64(totalFiles)*90)
+		Tasks.UpdateTask(taskID, TaskRunning, progress, fmt.Sprintf("Compressing %s...", info.Name()))
+
+		return nil
+	})
+
+	Tasks.UpdateTask(taskID, TaskCompleted, 100, "Archive created successfully")
+}
+
+func UnzipAsync(taskID string, sourceFull, destFolder string) {
+	Tasks.UpdateTask(taskID, TaskRunning, 0, "Opening archive...")
+
+	r, err := zip.OpenReader(sourceFull)
+	if err != nil {
+		Tasks.FailTask(taskID, err)
+		return
+	}
+	defer r.Close()
+
+	totalFiles := len(r.File)
+	if totalFiles == 0 {
+		Tasks.FailTask(taskID, fmt.Errorf("archive is empty"))
+		return
+	}
+
+	Tasks.UpdateTask(taskID, TaskRunning, 5, "Extracting files...")
+
+	for i, f := range r.File {
+		// Prevent Zip Slip vulnerability
+		cleanPath := filepath.Clean(f.Name)
+		if strings.HasPrefix(cleanPath, "..") {
+			continue // Skip malicious paths
+		}
+
+		fpath := filepath.Join(destFolder, cleanPath)
+
+		if f.FileInfo().IsDir() {
+			os.MkdirAll(fpath, os.ModePerm)
+			continue
+		}
+
+		if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
+			Tasks.FailTask(taskID, err)
+			return
+		}
+
+		outFile, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
+		if err != nil {
+			Tasks.FailTask(taskID, err)
+			return
+		}
+
+		rc, err := f.Open()
+		if err != nil {
+			outFile.Close()
+			Tasks.FailTask(taskID, err)
+			return
+		}
+
+		_, err = io.Copy(outFile, rc)
+		outFile.Close()
+		rc.Close()
+
+		if err != nil {
+			Tasks.FailTask(taskID, err)
+			return
+		}
+
+		progress := 5 + int(float64(i+1)/float64(totalFiles)*90)
+		Tasks.UpdateTask(taskID, TaskRunning, progress, fmt.Sprintf("Extracted %s", filepath.Base(fpath)))
+	}
+
+	Tasks.UpdateTask(taskID, TaskCompleted, 100, "Extracted successfully")
+}