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/*
* Copyright 2018 Allan Wang
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 com.pitchedapps.frost.utils
import android.content.Context
import android.text.TextUtils
import ca.allanwang.kau.utils.use
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
/**
* Created by Allan Wang on 2017-09-24.
*/
object FrostAdBlock : AdBlocker("adblock.txt")
object FrostPglAdBlock : AdBlocker("pgl.yoyo.org.txt")
/**
* Base implementation of an AdBlocker
* Wrap this in a singleton and initialize it to use it
*/
open class AdBlocker(val assetPath: String) {
val data: MutableSet<String> = mutableSetOf()
fun init(context: Context) {
GlobalScope.launch {
val content = context.assets.open(assetPath).bufferedReader().use { f ->
f.readLines().filter { !it.startsWith("#") }
}
data.addAll(content)
L.i { "Initialized adblock for $assetPath with ${data.size} hosts" }
}
}
fun isAd(url: String?): Boolean {
url ?: return false
val httpUrl = url.toHttpUrlOrNull() ?: return false
return isAdHost(httpUrl.host)
}
tailrec fun isAdHost(host: String): Boolean {
if (TextUtils.isEmpty(host))
return false
val index = host.indexOf(".")
if (index < 0 || index + 1 < host.length) return false
if (data.contains(host)) return true
return isAdHost(host.substring(index + 1))
}
}
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