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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2023 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package desktopentry
import (
"bytes"
"fmt"
"net/url"
"path/filepath"
"strings"
"github.com/snapcore/snapd/strutil/shlex"
)
func shellQuote(s string) string {
return "'" + strings.Replace(s, "'", "'\\''", -1) + "'"
}
func toFilePath(uri string) (string, error) {
u, err := url.Parse(uri)
if err != nil {
return "", err
}
if !u.IsAbs() {
return "", fmt.Errorf("%q is not an absolute URI", uri)
}
if u.Scheme != "file" {
return "", fmt.Errorf("%q is not a file URI", uri)
}
if !filepath.IsAbs(u.Path) {
return "", fmt.Errorf("%q does not have an absolute file path", uri)
}
return u.Path, nil
}
func expandMacro(r rune, buf *bytes.Buffer, de *DesktopEntry, uris []string) ([]string, error) {
switch r {
case 'u':
if len(uris) > 0 {
// Format as a file path, falling back to a URI
arg, err := toFilePath(uris[0])
if err != nil {
arg = uris[0]
}
buf.WriteString(shellQuote(arg))
uris = uris[1:]
}
case 'U':
first := true
for _, u := range uris {
if !first {
buf.WriteRune(' ')
}
first = false
// Format as a file path, falling back to a URI
arg, err := toFilePath(u)
if err != nil {
arg = u
}
buf.WriteString(shellQuote(arg))
}
uris = nil
case 'f':
if len(uris) > 0 {
arg, err := toFilePath(uris[0])
if err != nil {
return nil, err
}
buf.WriteString(shellQuote(arg))
uris = uris[1:]
}
case 'F':
first := true
for _, u := range uris {
if !first {
buf.WriteRune(' ')
}
first = false
arg, err := toFilePath(u)
if err != nil {
return nil, err
}
buf.WriteString(shellQuote(arg))
}
uris = nil
case 'i':
if de.Icon != "" {
buf.WriteString("--icon ")
buf.WriteString(shellQuote(de.Icon))
}
case 'c':
if de.Name != "" {
buf.WriteString(shellQuote(de.Name))
}
case 'k':
if de.Filename != "" {
buf.WriteString(shellQuote(de.Filename))
}
case '%':
buf.WriteRune('%')
}
return uris, nil
}
// expandExec expands macros within a desktop entry exec variable.
//
// The format is described in the Desktop Entry Specification:
//
// https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#exec-variables
//
// It uses glib implementation as a reference where the spec is
// ambiguous.
func expandExec(de *DesktopEntry, exec string, uris []string) (args []string, err error) {
var buf bytes.Buffer
isMacro := false
nUris := len(uris)
for _, r := range exec {
if isMacro {
if uris, err = expandMacro(r, &buf, de, uris); err != nil {
return nil, err
}
isMacro = false
} else if r == '%' {
isMacro = true
} else {
buf.WriteRune(r)
}
}
// If no URI substitutions have happened, add a single
// implicit %f argument
if len(uris) > 0 && len(uris) == nUris {
buf.WriteRune(' ')
if _, err = expandMacro('f', &buf, de, uris); err != nil {
return nil, err
}
}
return shlex.Split(buf.String())
}
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