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CloudflareInterceptor update (#2537) dcd3c709 Mike <51273546+SnakeDoc83@users.noreply.github.com> Jan 25, 2020 at 16:37

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Mike 2020-01-25 16:37:59 -05:00 committed by arkon
parent 0fd00331e1
commit 72920130c0
2 changed files with 37 additions and 43 deletions
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14
app/src/main/java/eu/kanade/tachiyomi/network/AndroidCookieJar.kt
View file

@ -46,13 +46,22 @@ class AndroidCookieJar(context: Context) : CookieJar {
}
}
fun remove(url: HttpUrl) {
fun remove(url: HttpUrl, cookieNames: List<String>? = null, maxAge: Int = -1) {
val urlString = url.toString()
val cookies = manager.getCookie(urlString) ?: return
fun List<String>.filterNames(): List<String> {
return if (cookieNames != null) {
this.filter { it in cookieNames }
} else {
this
}
}
cookies.split(";")
.map { it.substringBefore("=") }
.onEach { manager.setCookie(urlString, "$it=;Max-Age=-1") }
.filterNames()
.onEach { manager.setCookie(urlString, "$it=;Max-Age=$maxAge") }
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
syncManager.sync()
@ -67,5 +76,4 @@ class AndroidCookieJar(context: Context) : CookieJar {
syncManager.sync()
}
}
}

66
app/src/main/java/eu/kanade/tachiyomi/network/CloudflareInterceptor.kt
View file

@ -5,13 +5,11 @@ import android.content.Context
import android.os.Build
import android.os.Handler
import android.os.Looper
import android.webkit.WebResourceResponse
import android.webkit.WebSettings
import android.webkit.WebView
import eu.kanade.tachiyomi.util.WebViewClientCompat
import okhttp3.Interceptor
import okhttp3.Request
import okhttp3.Response
import okhttp3.*
import uy.kohesive.injekt.injectLazy
import java.io.IOException
import java.util.concurrent.CountDownLatch
import java.util.concurrent.TimeUnit
@ -22,6 +20,8 @@ class CloudflareInterceptor(private val context: Context) : Interceptor {
private val handler = Handler(Looper.getMainLooper())
private val networkHelper: NetworkHelper by injectLazy()
/**
* When this is called, it initializes the WebView if it wasn't already. We use this to avoid
* blocking the main thread too much. If used too often we could consider moving it to the
@ -39,14 +39,21 @@ class CloudflareInterceptor(private val context: Context) : Interceptor {
override fun intercept(chain: Interceptor.Chain): Response {
initWebView
val response = chain.proceed(chain.request())
val originalRequest = chain.request()
val response = chain.proceed(originalRequest)
// Check if Cloudflare anti-bot is on
if (response.code() == 503 && response.header("Server") in serverCheck) {
try {
response.close()
val solutionRequest = resolveWithWebView(chain.request())
return chain.proceed(solutionRequest)
networkHelper.cookieManager.remove(originalRequest.url(), listOf("__cfduid", "cf_clearance"), 0)
val oldCookie = networkHelper.cookieManager.get(originalRequest.url())
.firstOrNull { it.name() == "cf_clearance" }
return if (resolveWithWebView(originalRequest, oldCookie)) {
chain.proceed(originalRequest)
} else {
throw IOException("Failed to bypass Cloudflare!")
}
} catch (e: Exception) {
// Because OkHttp's enqueue only handles IOExceptions, wrap the exception so that
// we don't crash the entire app
@ -57,19 +64,15 @@ class CloudflareInterceptor(private val context: Context) : Interceptor {
return response
}
private fun isChallengeSolutionUrl(url: String): Boolean {
return "chk_jschl" in url
}
@SuppressLint("SetJavaScriptEnabled")
private fun resolveWithWebView(request: Request): Request {
private fun resolveWithWebView(request: Request, oldCookie: Cookie?): Boolean {
// We need to lock this thread until the WebView finds the challenge solution url, because
// OkHttp doesn't support asynchronous interceptors.
val latch = CountDownLatch(1)
var webView: WebView? = null
var solutionUrl: String? = null
var challengeFound = false
var cloudflareBypassed = false
val origRequestUrl = request.url().toString()
val headers = request.headers().toMultimap().mapValues { it.value.getOrNull(0) ?: "" }
@ -81,26 +84,17 @@ class CloudflareInterceptor(private val context: Context) : Interceptor {
view.settings.userAgentString = request.header("User-Agent")
view.webViewClient = object : WebViewClientCompat() {
override fun shouldOverrideUrlCompat(view: WebView, url: String): Boolean {
if (isChallengeSolutionUrl(url)) {
solutionUrl = url
override fun onPageFinished(view: WebView, url: String) {
fun isCloudFlareBypassed(): Boolean {
return networkHelper.cookieManager.get(HttpUrl.parse(origRequestUrl)!!)
.firstOrNull { it.name() == "cf_clearance" }
.let { it != null && it != oldCookie }
}
if (isCloudFlareBypassed()) {
cloudflareBypassed = true
latch.countDown()
}
return solutionUrl != null
}
override fun shouldInterceptRequestCompat(
view: WebView,
url: String
): WebResourceResponse? {
if (solutionUrl != null) {
// Intercept any request when we have the solution.
return WebResourceResponse("text/plain", "UTF-8", null)
}
return null
}
override fun onPageFinished(view: WebView, url: String) {
// Http error codes are only received since M
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&
url == origRequestUrl && !challengeFound
@ -140,15 +134,7 @@ class CloudflareInterceptor(private val context: Context) : Interceptor {
webView?.destroy()
}
val solution = solutionUrl ?: throw Exception("Challenge not found")
return Request.Builder().get()
.url(solution)
.headers(request.headers())
.addHeader("Referer", origRequestUrl)
.addHeader("Accept", "text/html,application/xhtml+xml,application/xml")
.addHeader("Accept-Language", "en")
.build()
return cloudflareBypassed
}
}