blob: 2352630e17855424ce8b049cf4eeb5b803b73c79 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
/*
* Copyright © 2017-2018 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.widget;
import android.support.annotation.Nullable;
import android.text.InputFilter;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import com.wireguard.android.model.Tunnel;
/**
* InputFilter for entering WireGuard configuration names (Linux interface names).
*/
public class NameInputFilter implements InputFilter {
private static boolean isAllowed(final char c) {
return Character.isLetterOrDigit(c) || "_=+.-".indexOf(c) >= 0;
}
public static InputFilter newInstance() {
return new NameInputFilter();
}
@Nullable
@Override
public CharSequence filter(final CharSequence source,
final int sStart, final int sEnd,
final Spanned dest,
final int dStart, final int dEnd) {
SpannableStringBuilder replacement = null;
int rIndex = 0;
final int dLength = dest.length();
for (int sIndex = sStart; sIndex < sEnd; ++sIndex) {
final char c = source.charAt(sIndex);
final int dIndex = dStart + (sIndex - sStart);
// Restrict characters to those valid in interfaces.
// Ensure adding this character does not push the length over the limit.
if ((dIndex < Tunnel.NAME_MAX_LENGTH && isAllowed(c)) &&
dLength + (sIndex - sStart) < Tunnel.NAME_MAX_LENGTH) {
++rIndex;
} else {
if (replacement == null)
replacement = new SpannableStringBuilder(source, sStart, sEnd);
replacement.delete(rIndex, rIndex + 1);
}
}
return replacement;
}
}
|
