Enhancement/url redirect manager (#182)

* Initial blacklist

* Move js checks to java

* Optimize imports and clean up request interceptor

app/src/main/assets/js/click_a.js

@@ -15,17 +15,16 @@ if (!window.hasOwnProperty('frost_click_a')) {
     if (element.tagName !== 'A') element = element.parentNode;
     //Notifications is two layers under
     if (element.tagName !== 'A') element = element.parentNode;
-    if (element.tagName === 'A' && element.getAttribute('href') !== '#') {
-      var url = element.getAttribute('href');
-      if (url.includes('photoset_token')) return;
-
-
+    if (element.tagName === 'A') {
       if (!prevented) {
+        var url = element.getAttribute('href');
         console.log('Click Intercept', url);
-        if (typeof Frost !== 'undefined') Frost.loadUrl(url);
+        // if frost is injected, check if loading the url through an overlay works
+        if (typeof Frost !== 'undefined' && Frost.loadUrl(url)) {
+            e.stopPropagation();
+            e.preventDefault();
+        }
       }
-      e.stopPropagation();
-      e.preventDefault();
     }
   }
 

app/src/main/assets/js/click_a.min.js

@@ -4,12 +4,10 @@ window.frost_click_a=!0
 ;var prevented=!1,_frostAClick=function(e){
 var t=e.target||e.srcElement
 ;if("A"!==t.tagName&&(t=t.parentNode),"A"!==t.tagName&&(t=t.parentNode),
-"A"===t.tagName&&"#"!==t.getAttribute("href")){
+"A"===t.tagName&&!prevented){
 var n=t.getAttribute("href")
-;if(n.includes("photoset_token"))return
-;prevented||(console.log("Click Intercept",n),
-"undefined"!=typeof Frost&&Frost.loadUrl(n)),
-e.stopPropagation(),e.preventDefault()
+;console.log("Click Intercept",n),"undefined"!=typeof Frost&&Frost.loadUrl(n)&&(e.stopPropagation(),
+e.preventDefault())
 }
 },_frostPreventClick=function(){
 console.log("Click prevented"),prevented=!0

app/src/main/kotlin/com/pitchedapps/frost/utils/Utils.kt

@@ -54,6 +54,11 @@ fun Activity.cookies(): ArrayList<CookieModel> {
     return intent?.extras?.getParcelableArrayList<CookieModel>(EXTRA_COOKIES) ?: arrayListOf()
 }
 
+/**
+ * Launches the given url in a new overlay (if it already isn't in an overlay)
+ * Note that most requests may need to first check if the url can be launched as an overlay
+ * See [requestWebOverlay] to verify the launch
+ */
 fun Context.launchWebOverlay(url: String) {
     val argUrl = url.formattedFbUrl
     L.v("Launch received", url)

app/src/main/kotlin/com/pitchedapps/frost/web/FrostJSI.kt

@@ -25,10 +25,14 @@ class FrostJSI(val webView: FrostWebViewCore) {
     val cookies: ArrayList<CookieModel>
         get() = activity?.cookies() ?: arrayListOf()
 
+    /**
+     * Attempts to load the url in an overlay
+     * Returns {@code true} if successful, meaning the event is consumed,
+     * or {@code false} otherwise, meaning the event should be propagated
+     */
     @JavascriptInterface
-    fun loadUrl(url: String) {
-        context.launchWebOverlay(url)
-    }
+    fun loadUrl(url: String?): Boolean
+            = if (url == null) false else context.requestWebOverlay(url)
 
     @JavascriptInterface
     fun reloadBaseUrl(animate: Boolean) {

app/src/main/kotlin/com/pitchedapps/frost/web/FrostRequestInterceptor.kt

@@ -3,6 +3,8 @@ package com.pitchedapps.frost.web
 import android.webkit.WebResourceRequest
 import android.webkit.WebResourceResponse
 import android.webkit.WebView
+import ca.allanwang.kau.kotlin.LazyContext
+import ca.allanwang.kau.kotlin.lazyContext
 import ca.allanwang.kau.utils.use
 import com.pitchedapps.frost.utils.L
 import com.pitchedapps.frost.utils.Prefs
@@ -19,41 +21,37 @@ import java.io.ByteArrayInputStream
 private val blankResource: WebResourceResponse by lazy { WebResourceResponse("text/plain", "utf-8", ByteArrayInputStream("".toByteArray())) }
 
 //these hosts will redirect to a blank resource
-private val blacklistHost: Set<String> by lazy {
-    setOf(
-            "edge-chat.facebook.com"
-    )
-}
+private val blacklistHost: Set<String> =
+        setOf(
+                "edge-chat.facebook.com"
+        )
 
 //these hosts will return null and skip logging
-private val whitelistHost: Set<String> by lazy {
-    setOf(
-            "static.xx.fbcdn.net",
-            "m.facebook.com",
-            "touch.facebook.com"
-    )
-}
+private val whitelistHost: Set<String> =
+        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
-private val adWhitelistHost: Set<String> by lazy {
-    setOf(
-            "scontent-sea1-1.xx.fbcdn.net"
-    )
+private val adWhitelistHost: Set<String> =
+        setOf(
+                "scontent-sea1-1.xx.fbcdn.net"
+        )
+
+private val adblock: LazyContext<Set<String>> = lazyContext {
+    it.assets.open("adblock.txt").bufferedReader().use { it.readLines().toSet() }
 }
 
-private var adblock: Set<String>? = null
-
-fun shouldFrostInterceptRequest(view: WebView, request: WebResourceRequest): WebResourceResponse? {
+fun WebView.shouldFrostInterceptRequest(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
-    }
+    if (!adWhitelistHost.contains(host) && adblock(context).any { url.contains(it) }) return blankResource
     if (!shouldLoadImages && !Prefs.loadMediaOnMeteredNetwork && request.isMedia) return blankResource
     L.v("Intercept Request", "$host $url")
     return null

app/src/main/kotlin/com/pitchedapps/frost/web/FrostUrlOverlayValidator.kt

@@ -0,0 +1,48 @@
+package com.pitchedapps.frost.web
+
+import android.content.Context
+import com.pitchedapps.frost.facebook.formattedFbUrl
+import com.pitchedapps.frost.utils.L
+import com.pitchedapps.frost.utils.isFacebookUrl
+import com.pitchedapps.frost.utils.launchWebOverlay
+
+/**
+ * Created by Allan Wang on 2017-08-15.
+ *
+ * Due to the nature of facebook href's, many links
+ * cannot be resolved on a new window and must instead
+ * by loaded in the current page
+ * This helper method will collect all known cases and launch the overlay accordingly
+ * Returns {@code true} (default) if overlay is launcher, {@code false} otherwise
+ */
+fun Context.requestWebOverlay(url: String): Boolean {
+    if (url == "#") return false
+    /*
+     * Non facebook urls can be loaded
+     */
+    if (!url.formattedFbUrl.isFacebookUrl) {
+        launchWebOverlay(url)
+        L.d("Request web overlay is not a facebook url", url)
+        return true
+    }
+    /*
+     * Check blacklist
+     */
+    if (overlayBlacklist.any { url.contains(it) }) return false
+    /*
+     * Facebook messages have the following cases for the tid query
+     * mid* or id* for newer threads, which can be launched in new windows
+     * or a hash for old threads, which must be loaded on old threads
+     */
+    if (url.contains("/messages/read/?tid=")) {
+        if (!url.contains("?tid=id") && !url.contains("?tid=mid")) return false
+    }
+    L.v("Request web overlay passed", url)
+    launchWebOverlay(url)
+    return true
+}
+
+/**
+ * The following components should never be launched in a new overlay
+ */
+val overlayBlacklist = setOf("messages/?pageNum", "photoset_token")

app/src/main/kotlin/com/pitchedapps/frost/web/FrostWebViewClients.kt

@@ -11,7 +11,6 @@ import com.pitchedapps.frost.activities.LoginActivity
 import com.pitchedapps.frost.activities.MainActivity
 import com.pitchedapps.frost.activities.SelectorActivity
 import com.pitchedapps.frost.activities.WebOverlayActivity
-import com.pitchedapps.frost.facebook.FACEBOOK_COM
 import com.pitchedapps.frost.facebook.FB_URL_BASE
 import com.pitchedapps.frost.facebook.FbCookie
 import com.pitchedapps.frost.facebook.FbItem
@@ -34,7 +33,7 @@ import org.jetbrains.anko.withAlpha
 open class BaseWebViewClient : WebViewClient() {
 
     override fun shouldInterceptRequest(view: WebView, request: WebResourceRequest): WebResourceResponse?
-            = shouldFrostInterceptRequest(view, request)
+            = view.shouldFrostInterceptRequest(request)
 
 }
 
@@ -125,9 +124,7 @@ open class FrostWebViewClient(val webCore: FrostWebViewCore) : BaseWebViewClient
      */
     private fun launchRequest(request: WebResourceRequest): Boolean {
         L.d("Launching Url", request.url?.toString() ?: "null")
-        if (webCore.context is WebOverlayActivity) return false
-        webCore.context.launchWebOverlay(request.url.toString())
-        return true
+        return webCore.context !is WebOverlayActivity && webCore.context.requestWebOverlay(request.url.toString())
     }
 
     private fun launchImage(url: String, text: String? = null): Boolean {