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/*
* Copyright © 2017-2021 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.widget
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).
*/
class NameInputFilter : InputFilter {
override fun filter(source: CharSequence,
sStart: Int, sEnd: Int,
dest: Spanned,
dStart: Int, dEnd: Int): CharSequence? {
var replacement: SpannableStringBuilder? = null
var rIndex = 0
val dLength = dest.length
for (sIndex in sStart until sEnd) {
val c = source[sIndex]
val 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 = SpannableStringBuilder(source, sStart, sEnd)
replacement.delete(rIndex, rIndex + 1)
}
}
return replacement
}
companion object {
private fun isAllowed(c: Char) = Character.isLetterOrDigit(c) || "_=+.-".indexOf(c) >= 0
@JvmStatic
fun newInstance() = NameInputFilter()
}
}
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