backend functions for list, download, and delete local files

server/rest/handlers.go

@@ -0,0 +1,106 @@
+package rest
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/gofiber/fiber/v2"
+	"github.com/marcopeocchi/yt-dlp-web-ui/server/config"
+	"golang.org/x/exp/slices"
+)
+
+type DirectoryEntry struct {
+	Name   string `json:"name"`
+	Path   string `json:"path"`
+	SHASum string `json:"shaSum"`
+}
+
+func walkDir(root string) (*[]DirectoryEntry, error) {
+	files := []DirectoryEntry{}
+
+	err := filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if !d.IsDir() && !strings.HasPrefix(d.Name(), ".") {
+			h := sha256.New()
+			h.Write([]byte(path))
+
+			files = append(files, DirectoryEntry{
+				Path:   path,
+				Name:   d.Name(),
+				SHASum: hex.EncodeToString(h.Sum(nil)),
+			})
+		}
+		return nil
+	})
+
+	return &files, err
+}
+
+func ListDownloaded(ctx *fiber.Ctx) error {
+	root := config.Instance().GetConfig().DownloadPath
+
+	files, err := walkDir(root)
+	if err != nil {
+		return err
+	}
+
+	return ctx.JSON(files)
+}
+
+type DeleteRequest = DirectoryEntry
+
+func DeleteFile(ctx *fiber.Ctx) error {
+	req := new(DeleteRequest)
+
+	err := ctx.BodyParser(req)
+	if err != nil {
+		return err
+	}
+
+	root := config.Instance().GetConfig().DownloadPath
+
+	files, err := walkDir(root)
+	if err != nil {
+		return err
+	}
+
+	index := slices.IndexFunc(*files, func(e DirectoryEntry) bool {
+		return e.Path == req.Path && e.SHASum == req.SHASum
+	})
+
+	if index >= 0 {
+		err := os.Remove(req.Path)
+		if err != nil {
+			return err
+		}
+	}
+
+	return ctx.JSON(index)
+}
+
+type PlayRequest struct {
+	Path string
+}
+
+func PlayFile(ctx *fiber.Ctx) error {
+	req := new(PlayRequest)
+
+	err := ctx.BodyParser(req)
+	if err != nil {
+		return err
+	}
+
+	root := config.Instance().GetConfig().DownloadPath
+
+	if strings.Contains(filepath.Dir(req.Path), root) {
+		return ctx.SendFile(req.Path)
+	}
+
+	return ctx.SendStatus(fiber.StatusUnauthorized)
+}