feat: add direct links download functionality

- Implemented a new task type for handling direct links downloads.
- Added command handler for downloading multiple links via /dl command.
- Introduced progress tracking for direct link downloads.
- Enhanced filename parsing to support various encoding scenarios.
- Updated enums to include direct links as a task type.
- Refactored existing task structures to accommodate new functionality.
- Improved error handling and logging throughout the download process.

core/tasks/directlinks/task.go

@@ -0,0 +1,121 @@
+package directlinks
+
+import (
+	"context"
+	"net/http"
+	"sync"
+	"sync/atomic"
+
+	"github.com/krau/SaveAny-Bot/config"
+	"github.com/krau/SaveAny-Bot/pkg/enums/tasktype"
+	"github.com/krau/SaveAny-Bot/storage"
+)
+
+type File struct {
+	Name string
+	URL  string
+	Size int64
+}
+
+func (f *File) FileName() string {
+	return f.Name
+}
+
+func (f *File) FileSize() int64 {
+	return f.Size
+}
+
+type Task struct {
+	ID       string
+	ctx      context.Context
+	files    []*File
+	Storage  storage.Storage
+	StorPath string
+	Progress ProgressTracker
+
+	client          *http.Client // [TODO] parallel download
+	stream          bool
+	totalBytes      int64            // total bytes to download
+	downloadedBytes atomic.Int64     // downloaded bytes
+	totalFiles      int64            // total files to download
+	downloaded      atomic.Int64     // downloaded files count
+	processing      map[string]*File // {"url": File}
+	processingMu    sync.RWMutex
+	failed          map[string]error // [TODO] errors for each file
+}
+
+// DownloadedBytes implements TaskInfo.
+func (t *Task) DownloadedBytes() int64 {
+	return t.downloadedBytes.Load()
+}
+
+// Processing implements TaskInfo.
+func (t *Task) Processing() []FileInfo {
+	t.processingMu.RLock()
+	defer t.processingMu.RUnlock()
+	infos := make([]FileInfo, 0, len(t.processing))
+	for _, f := range t.processing {
+		infos = append(infos, f)
+	}
+	return infos
+}
+
+// StorageName implements TaskInfo.
+func (t *Task) StorageName() string {
+	return t.Storage.Name()
+}
+
+// StoragePath implements TaskInfo.
+func (t *Task) StoragePath() string {
+	return t.StorPath
+}
+
+// TotalBytes implements TaskInfo.
+func (t *Task) TotalBytes() int64 {
+	return t.totalBytes
+}
+
+// TotalFiles implements TaskInfo.
+func (t *Task) TotalFiles() int {
+	return int(t.totalFiles)
+}
+
+func (t *Task) Type() tasktype.TaskType {
+	return tasktype.TaskTypeDirectlinks
+}
+
+func (t *Task) TaskID() string {
+	return t.ID
+}
+
+func NewTask(
+	id string,
+	ctx context.Context,
+	links []string,
+	stor storage.Storage,
+	storPath string,
+	progressTracker ProgressTracker,
+) *Task {
+	_, ok := stor.(storage.StorageCannotStream)
+	stream := config.C().Stream && !ok
+	files := make([]*File, 0, len(links))
+	for _, link := range links {
+		files = append(files, &File{
+			URL: link,
+		})
+	}
+	return &Task{
+		ID:           id,
+		ctx:          ctx,
+		files:        files,
+		Storage:      stor,
+		StorPath:     storPath,
+		Progress:     progressTracker,
+		stream:       stream,
+		client:       http.DefaultClient,
+		processing:   make(map[string]*File),
+		processingMu: sync.RWMutex{},
+		failed:       make(map[string]error),
+		totalFiles:   int64(len(files)),
+	}
+}