server: implement local file management

server/api/db.go

@@ -13,6 +13,7 @@ import (
 var ErrUserNotFound = errors.New("db: user not found")
 var ErrSessionNotFound = errors.New("db: session not found")
 var ErrChannelNotFound = errors.New("db: channel not found")
+var ErrFileNotFound = errors.New("db: file not found")
 
 func dbGetUser(id string) (*User, error) {
 	query := `SELECT id, name, password FROM users WHERE id = $1`
@@ -206,3 +207,29 @@ func dbDeleteChannel(id string) error {
 	slog.Debug("db: channel deleted")
 	return nil
 }
+
+func dbAddFile(file *File) error {
+	query := `INSERT INTO files (id, name, created, backend, path) VALUES ($1, $2, $3, $4, $5)`
+	_, err := db.Pool.Exec(context.Background(), query, file.ID, file.Name, file.Created, file.Backend, file.Path)
+	if err != nil {
+		slog.Error("db: failed to add file", "error", err, "fileid", file.ID)
+		return fmt.Errorf("failed to add file")
+	}
+	slog.Debug("db: file added", "fileid", file.ID, "filename", file.Name)
+	return nil
+}
+
+func dbGetFile(id string) (*File, error) {
+	query := `SELECT id, name, created, backend, path FROM files WHERE id = $1`
+	var file File
+	err := db.Pool.QueryRow(context.Background(), query, id).Scan(&file.ID, &file.Name, &file.Created, &file.Backend, &file.Path)
+	if errors.Is(err, pgx.ErrNoRows) {
+		slog.Debug("db: file not found", "fileid", id)
+		return nil, ErrFileNotFound
+	} else if err != nil {
+		slog.Error("db: failed to query file", "error", err)
+		return nil, fmt.Errorf("failed to query file")
+	}
+	slog.Debug("db: file found", "fileid", file.ID, "filename", file.Name)
+	return &file, nil
+}