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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.web
import android.webkit.WebResourceRequest
import android.webkit.WebResourceResponse
import android.webkit.WebView
import com.pitchedapps.frost.utils.FrostPglAdBlock
import com.pitchedapps.frost.utils.L
import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
import java.io.ByteArrayInputStream
/**
* Created by Allan Wang on 2017-07-13.
*
* Handler to decide when a request should be done by us
* This is the crux of Frost's optimizations for the web browser
*/
private val blankResource: WebResourceResponse by lazy {
WebResourceResponse(
"text/plain",
"utf-8",
ByteArrayInputStream("".toByteArray())
)
}
fun WebView.shouldFrostInterceptRequest(request: WebResourceRequest): WebResourceResponse? {
val requestUrl = request.url?.toString() ?: return null
val httpUrl = requestUrl.toHttpUrlOrNull() ?: return null
val host = httpUrl.host
val url = httpUrl.toString()
if (host.contains("facebook") || host.contains("fbcdn")) return null
if (FrostPglAdBlock.isAd(host)) return blankResource
// if (!shouldLoadImages && !Prefs.loadMediaOnMeteredNetwork && request.isMedia) return blankResource
L.v { "Intercept Request: $host $url" }
return null
}
/**
* Wrapper to ensure that null exceptions are not reached
*/
fun WebResourceRequest.query(action: (url: String) -> Boolean): Boolean {
return action(url?.path ?: return false)
}
val WebResourceRequest.isImage: Boolean
get() = query { it.contains(".jpg") || it.contains(".png") }
val WebResourceRequest.isMedia: Boolean
get() = query { it.contains(".jpg") || it.contains(".png") || it.contains("video") }
/**
* Generic filter passthrough
* If Resource is already nonnull, pass it, otherwise check if filter is met and override the response accordingly
*/
fun WebResourceResponse?.filter(request: WebResourceRequest, filter: (url: String) -> Boolean) =
filter(request.query { filter(it) })
fun WebResourceResponse?.filter(filter: Boolean): WebResourceResponse? = this
?: if (filter) blankResource else null
fun WebResourceResponse?.filterCss(request: WebResourceRequest): WebResourceResponse? =
filter(request) { it.endsWith(".css") }
fun WebResourceResponse?.filterImage(request: WebResourceRequest): WebResourceResponse? =
filter(request.isImage)
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