84 lines
2.9 KiB
Go
84 lines
2.9 KiB
Go
// Fenrir console screen reader.
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// Copyright (c) 2026 Storm Dragon
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// SPDX-License-Identifier: GPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along with
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// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.
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package input
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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)
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// Layout_paths keeps named TOML layouts in Fenrir's keyboard directories.
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// Explicit paths select exactly one file. The bundle is an on-disk runtime asset.
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func Layout_paths(layout, home string, uid int, bundledDirectory string) ([]string, error) {
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if strings.TrimSpace(layout) == "" || strings.ContainsAny(layout, "\x00\r\n") {
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return nil, fmt.Errorf("keyboard layout cannot be empty or contain control characters")
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}
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if filepath.Ext(layout) != "" && filepath.Ext(layout) != ".toml" {
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return nil, fmt.Errorf("keyboard layout must use TOML")
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}
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if strings.ContainsRune(layout, filepath.Separator) || filepath.IsAbs(layout) {
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if filepath.Ext(layout) != ".toml" {
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return nil, fmt.Errorf("keyboard layout path must end in .toml")
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}
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return []string{layout}, nil
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}
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name := strings.TrimSuffix(layout, ".toml")
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if name == "" || name == "." || name == ".." {
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return nil, fmt.Errorf("invalid keyboard layout name")
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}
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name += ".toml"
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paths := []string{}
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if uid != 0 {
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paths = append(paths, filepath.Join(home, ".local/share/stormux/fenrirscreenreader/keyboard", name))
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}
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paths = append(paths, filepath.Join("/etc/fenrirscreenreader/keyboard", name))
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if bundledDirectory != "" {
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paths = append(paths, filepath.Join(bundledDirectory, name))
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}
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return paths, nil
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}
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// Load_bindings selects one whole file. A malformed or unreadable candidate
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// stops loading; only absent named candidates advance to the next directory.
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func Load_bindings(paths []string) (Layout, string, error) {
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for _, path := range paths {
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file, err := os.Open(path)
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if errors.Is(err, os.ErrNotExist) {
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continue
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}
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if err != nil {
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return Layout{}, path, err
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}
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data, readErr := io.ReadAll(io.LimitReader(file, (1<<20)+1))
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closeErr := file.Close()
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if err := errors.Join(readErr, closeErr); err != nil {
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return Layout{}, path, err
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}
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if len(data) > 1<<20 {
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return Layout{}, path, fmt.Errorf("keyboard layout exceeds 1 MiB")
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}
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bindings, err := Decode_bindings(data)
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return bindings, path, err
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}
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return Layout{}, "", fmt.Errorf("keyboard layout not found (searched %s)", strings.Join(paths, ", "))
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}
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