diff options
Diffstat (limited to 'ui/src/main/java/com/wireguard/android/widget/NameInputFilter.java')
-rw-r--r-- | ui/src/main/java/com/wireguard/android/widget/NameInputFilter.java | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/ui/src/main/java/com/wireguard/android/widget/NameInputFilter.java b/ui/src/main/java/com/wireguard/android/widget/NameInputFilter.java new file mode 100644 index 00000000..030be25a --- /dev/null +++ b/ui/src/main/java/com/wireguard/android/widget/NameInputFilter.java @@ -0,0 +1,53 @@ +/* + * Copyright © 2017-2019 WireGuard LLC. All Rights Reserved. + * SPDX-License-Identifier: Apache-2.0 + */ + +package com.wireguard.android.widget; + +import androidx.annotation.Nullable; +import android.text.InputFilter; +import android.text.SpannableStringBuilder; +import android.text.Spanned; + +import com.wireguard.android.backend.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; + } +} |