From afd1c6fc796e9ab853a24b2adc26832b6bf11136 Mon Sep 17 00:00:00 2001
From: Ezerous <ezerous@gmail.com>
Date: Mon, 22 Oct 2018 19:57:09 +0300
Subject: [PATCH] Deobfuscate Cloudflare-obfuscated emails

---
 app/build.gradle                              |  2 +-
 .../gr/thmmy/mthmmy/base/BaseApplication.java | 11 ++++-
 .../thmmy/mthmmy/utils/EmailDeobfuscator.java | 44 +++++++++++++++++++
 3 files changed, 55 insertions(+), 2 deletions(-)
 create mode 100644 app/src/main/java/gr/thmmy/mthmmy/utils/EmailDeobfuscator.java

diff --git a/app/build.gradle b/app/build.gradle
index d13093bf..cfb58070 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -64,7 +64,7 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'com.google.android.material:material:1.0.0'
     implementation 'com.google.firebase:firebase-core:16.0.4'
-    implementation 'com.google.firebase:firebase-messaging:17.3.3'
+    implementation 'com.google.firebase:firebase-messaging:17.3.4'
     implementation 'com.crashlytics.sdk.android:crashlytics:2.9.5'
     implementation 'com.squareup.okhttp3:okhttp:3.11.0'
     implementation 'com.squareup.picasso:picasso:2.5.2'
diff --git a/app/src/main/java/gr/thmmy/mthmmy/base/BaseApplication.java b/app/src/main/java/gr/thmmy/mthmmy/base/BaseApplication.java
index d181301d..e218c9f4 100644
--- a/app/src/main/java/gr/thmmy/mthmmy/base/BaseApplication.java
+++ b/app/src/main/java/gr/thmmy/mthmmy/base/BaseApplication.java
@@ -38,8 +38,11 @@ import io.fabric.sdk.android.Fabric;
 import okhttp3.HttpUrl;
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
+import okhttp3.Response;
 import timber.log.Timber;
 
+import static gr.thmmy.mthmmy.utils.EmailDeobfuscator.deobfuscate;
+
 public class BaseApplication extends Application {
     private static BaseApplication baseApplication; //BaseApplication singleton
 
@@ -100,8 +103,14 @@ public class BaseApplication extends Application {
                             request = request.newBuilder().url(newUrl).build();
                         }
                     }
-                    return chain.proceed(request);
 
+                    Response response = chain.proceed(request);
+                    try {
+                        response = deobfuscate(response);
+                    } catch (Exception e) {
+                        Timber.e(e, "Email deobfuscation error.");
+                    }
+                    return response;
                 })
                 .connectTimeout(30, TimeUnit.SECONDS)
                 .writeTimeout(30, TimeUnit.SECONDS)
diff --git a/app/src/main/java/gr/thmmy/mthmmy/utils/EmailDeobfuscator.java b/app/src/main/java/gr/thmmy/mthmmy/utils/EmailDeobfuscator.java
new file mode 100644
index 00000000..56ee76ad
--- /dev/null
+++ b/app/src/main/java/gr/thmmy/mthmmy/utils/EmailDeobfuscator.java
@@ -0,0 +1,44 @@
+package gr.thmmy.mthmmy.utils;
+
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+import org.jsoup.nodes.TextNode;
+import org.jsoup.select.Elements;
+
+import java.io.IOException;
+
+import okhttp3.MediaType;
+import okhttp3.Response;
+import okhttp3.ResponseBody;
+
+//Deobfuscates Cloudflare-obfuscated emails
+public class EmailDeobfuscator {
+    public static Response deobfuscate(Response response) throws IOException {
+        String responseBody = response.body().string();
+        Document document = Jsoup.parse(responseBody);
+        Elements obfuscatedEmails = document.select("span.__cf_email__");
+        for (Element obfuscatedEmail : obfuscatedEmails) {
+            String email = deobfuscateEmail(obfuscatedEmail.attr("data-cfemail"));
+            Element parent = obfuscatedEmail.parent();
+            if (parent.is("a")&&parent.attr("href").contains("email-protection"))
+                parent.attr("href", "mailto:"+email);
+            obfuscatedEmail.replaceWith(new TextNode(email, ""));
+        }
+
+        MediaType contentType = response.body().contentType();
+        ResponseBody body = ResponseBody.create(contentType, document.toString());
+        return response.newBuilder().body(body).build();
+    }
+
+
+    private static String deobfuscateEmail(final String encodedString) {
+        final StringBuilder email = new StringBuilder();
+        final int r = Integer.parseInt(encodedString.substring(0, 2), 16);
+        for (int n = 2; n < encodedString.length(); n += 2) {
+            final int i = Integer.parseInt(encodedString.substring(n, n+2), 16) ^ r;
+            email.append(Character.toString ((char) i));
+        }
+        return email.toString();
+    }
+}