Download REST API endpoints (#72)

* backend and frontend hotfixes, see message

Improved rendering on the frontend by cutting unecessary useStates.
Backend side, downloads now auto resume even on application kill.

* download rest api endpoints, general code refactor

* download request json mappings

server/handlers/archive.go

@@ -0,0 +1,157 @@
+package handlers
+
+import (
+	"encoding/hex"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/goccy/go-json"
+	"github.com/marcopeocchi/yt-dlp-web-ui/server/config"
+	"github.com/marcopeocchi/yt-dlp-web-ui/server/utils"
+)
+
+const (
+	TOKEN_COOKIE_NAME = "jwt"
+)
+
+type DirectoryEntry struct {
+	Name        string    `json:"name"`
+	Path        string    `json:"path"`
+	Size        int64     `json:"size"`
+	SHASum      string    `json:"shaSum"`
+	ModTime     time.Time `json:"modTime"`
+	IsVideo     bool      `json:"isVideo"`
+	IsDirectory bool      `json:"isDirectory"`
+}
+
+func walkDir(root string) (*[]DirectoryEntry, error) {
+	files := []DirectoryEntry{}
+
+	dirs, err := os.ReadDir(root)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, d := range dirs {
+		if !utils.IsValidEntry(d) {
+			continue
+		}
+
+		path := filepath.Join(root, d.Name())
+
+		info, err := d.Info()
+		if err != nil {
+			return nil, err
+		}
+
+		files = append(files, DirectoryEntry{
+			Path:        path,
+			Name:        d.Name(),
+			Size:        info.Size(),
+			SHASum:      utils.ShaSumString(path),
+			IsVideo:     utils.IsVideo(d),
+			IsDirectory: d.IsDir(),
+			ModTime:     info.ModTime(),
+		})
+	}
+
+	return &files, err
+}
+
+type ListRequest struct {
+	SubDir  string `json:"subdir"`
+	OrderBy string `json:"orderBy"`
+}
+
+func ListDownloaded(w http.ResponseWriter, r *http.Request) {
+	root := config.Instance().GetConfig().DownloadPath
+	req := new(ListRequest)
+
+	err := json.NewDecoder(r.Body).Decode(&req)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	files, err := walkDir(filepath.Join(root, req.SubDir))
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	if req.OrderBy == "modtime" {
+		sort.SliceStable(*files, func(i, j int) bool {
+			return (*files)[i].ModTime.After((*files)[j].ModTime)
+		})
+	}
+
+	w.WriteHeader(http.StatusOK)
+	err = json.NewEncoder(w).Encode(files)
+
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+type DeleteRequest = DirectoryEntry
+
+func DeleteFile(w http.ResponseWriter, r *http.Request) {
+	req := new(DeleteRequest)
+
+	err := json.NewDecoder(r.Body).Decode(&req)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	sum := utils.ShaSumString(req.Path)
+	if sum != req.SHASum {
+		http.Error(w, "shasum mismatch", http.StatusBadRequest)
+		return
+	}
+
+	err = os.Remove(req.Path)
+	if err != nil {
+		http.Error(w, "shasum mismatch", http.StatusBadRequest)
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode("ok")
+}
+
+func SendFile(w http.ResponseWriter, r *http.Request) {
+	path := chi.URLParam(r, "id")
+
+	if path == "" {
+		http.Error(w, "inexistent path", http.StatusBadRequest)
+		return
+	}
+
+	decoded, err := hex.DecodeString(path)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	decodedStr := string(decoded)
+
+	root := config.Instance().GetConfig().DownloadPath
+
+	// TODO: further path / file validations
+	if strings.Contains(filepath.Dir(decodedStr), root) {
+		// ctx.Response().Header.Set(
+		// 	"Content-Disposition",
+		// 	"inline; filename="+filepath.Base(decodedStr),
+		// )
+
+		http.ServeFile(w, r, decodedStr)
+	}
+
+	w.WriteHeader(http.StatusUnauthorized)
+}

server/handlers/login.go

@@ -0,0 +1,65 @@
+package handlers
+
+import (
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/goccy/go-json"
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/marcopeocchi/yt-dlp-web-ui/server/config"
+)
+
+type LoginRequest struct {
+	Secret string `json:"secret"`
+}
+
+func Login(w http.ResponseWriter, r *http.Request) {
+	req := new(LoginRequest)
+	err := json.NewDecoder(r.Body).Decode(&req)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	if config.Instance().GetConfig().RPCSecret != req.Secret {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	expiresAt := time.Now().Add(time.Hour * 24 * 30)
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
+		"expiresAt": expiresAt,
+	})
+
+	tokenString, err := token.SignedString([]byte(os.Getenv("JWT_SECRET")))
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	cookie := &http.Cookie{
+		Name:     TOKEN_COOKIE_NAME,
+		HttpOnly: true,
+		Secure:   false,
+		Expires:  expiresAt, // 30 days
+		Value:    tokenString,
+		Path:     "/",
+	}
+
+	http.SetCookie(w, cookie)
+}
+
+func Logout(w http.ResponseWriter, r *http.Request) {
+	cookie := &http.Cookie{
+		Name:     TOKEN_COOKIE_NAME,
+		HttpOnly: true,
+		Secure:   false,
+		Expires:  time.Now(),
+		Value:    "",
+		Path:     "/",
+	}
+
+	http.SetCookie(w, cookie)
+}