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package com.pitchedapps.frost.web
import android.webkit.WebResourceRequest
import android.webkit.WebResourceResponse
import android.webkit.WebView
import ca.allanwang.kau.utils.use
import com.pitchedapps.frost.utils.L
import okhttp3.HttpUrl
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
*/
val blankResource: WebResourceResponse by lazy { WebResourceResponse("text/plain", "utf-8", ByteArrayInputStream("".toByteArray())) }
//these hosts will redirect to a blank resource
val blacklistHost: Set<String> by lazy {
setOf(
"edge-chat.facebook.com"
)
}
//these hosts will return null and skip logging
val whitelistHost: Set<String> by lazy {
setOf(
"static.xx.fbcdn.net",
"m.facebook.com",
"touch.facebook.com"
)
}
//these hosts will skip ad inspection
//this list does not have to include anything from the two above
val adWhitelistHost: Set<String> by lazy {
setOf(
"scontent-sea1-1.xx.fbcdn.net"
)
}
var adblock: Set<String>? = null
fun shouldFrostInterceptRequest(view: WebView, request: WebResourceRequest): WebResourceResponse? {
val httpUrl = HttpUrl.parse(request.url?.toString() ?: return null) ?: return null
val host = httpUrl.host()
val url = httpUrl.toString()
if (blacklistHost.contains(host)) return blankResource
if (whitelistHost.contains(host)) return null
if (!adWhitelistHost.contains(host)) {
if (adblock == null) adblock = view.context.assets.open("adblock.txt").bufferedReader().use { it.readLines().toSet() }
if (adblock?.any { url.contains(it) } ?: false) 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)
}
/**
* 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): WebResourceResponse?
= this ?: if (request.query { filter(it) }) blankResource else null
fun WebResourceResponse?.filterCss(request: WebResourceRequest): WebResourceResponse?
= filter(request) { it.endsWith(".css") }
fun WebResourceResponse?.filterImage(request: WebResourceRequest): WebResourceResponse?
= filter(request) { it.contains(".jpg") || it.contains(".png") }
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