From 9b39e693d0ea9e1917d37c8c570529ab9a6c52b7 Mon Sep 17 00:00:00 2001
From: Christian Schneppe <christian@pix-art.de>
Date: Sun, 8 Apr 2018 20:57:53 +0200
Subject: trim to original resource if server added something

---
 .../de/pixart/messenger/xmpp/XmppConnection.java   | 24 +++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/main/java/de/pixart/messenger/xmpp/XmppConnection.java b/src/main/java/de/pixart/messenger/xmpp/XmppConnection.java
index 0cab67922..515f0b3c6 100644
--- a/src/main/java/de/pixart/messenger/xmpp/XmppConnection.java
+++ b/src/main/java/de/pixart/messenger/xmpp/XmppConnection.java
@@ -1,5 +1,6 @@
 package de.pixart.messenger.xmpp;
 
+import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.SystemClock;
@@ -1035,6 +1036,8 @@ public class XmppConnection implements Runnable {
         clearIqCallbacks();
         if (account.getJid().isBareJid()) {
             account.setResource(this.createNewResource());
+        } else {
+            fixResource(mXmppConnectionService, account);
         }
         final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
         final String resource = Config.USE_RANDOM_RESOURCE_ON_EVERY_BIND ? nextRandomId() : account.getResource();
@@ -1315,7 +1318,7 @@ public class XmppConnection implements Runnable {
 
     private void sendStartStream() throws IOException {
         final Tag stream = Tag.start("stream:stream");
-        stream.setAttribute("to", account.getServer().toString());
+        stream.setAttribute("to", account.getServer());
         stream.setAttribute("version", "1.0");
         stream.setAttribute("xml:lang", "en");
         stream.setAttribute("xmlns", "jabber:client");
@@ -1327,6 +1330,25 @@ public class XmppConnection implements Runnable {
         return mXmppConnectionService.getString(R.string.app_name) + '.' + nextRandomId(true);
     }
 
+    private static void fixResource(Context context, Account account) {
+        String resource = account.getResource();
+        int fixedPartLength = context.getString(R.string.app_name).length() + 1; //include the trailing dot
+        int randomPartLength = 4; // 3 bytes
+        if (resource != null && resource.length() > fixedPartLength + randomPartLength) {
+            if (validBase64(resource.substring(fixedPartLength, fixedPartLength + randomPartLength))) {
+                account.setResource(resource.substring(0, fixedPartLength + randomPartLength));
+            }
+        }
+    }
+
+    private static boolean validBase64(String input) {
+        try {
+            return Base64.decode(input, Base64.URL_SAFE).length == 3;
+        } catch (Throwable throwable) {
+            return false;
+        }
+    }
+
     private String nextRandomId() {
         return nextRandomId(false);
     }
-- 
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