support omemo:// style urls

src/main/java/eu/siacs/conversations/entities/Message.java

@@ -657,6 +657,12 @@ public class Message extends AbstractEntity {
 		}
 		try {
 			URL url = new URL(body);
+			String ref = url.getRef();
+			final String protocol = url.getProtocol();
+			final boolean encrypted = ref != null && ref.matches("([A-Fa-f0-9]{2}){48}");
+			if ("omemo".equalsIgnoreCase(protocol) && encrypted) {
+				return Decision.MUST;
+			}
 			if (!url.getProtocol().equalsIgnoreCase("http") && !url.getProtocol().equalsIgnoreCase("https")) {
 				return Decision.NEVER;
 			} else if (oob) {
@@ -666,8 +672,6 @@ public class Message extends AbstractEntity {
 			if (extension == null) {
 				return Decision.NEVER;
 			}
-			String ref = url.getRef();
-			boolean encrypted = ref != null && ref.matches("([A-Fa-f0-9]{2}){48}");
 
 			if (encrypted) {
 				return Decision.MUST;

src/main/java/eu/siacs/conversations/http/OmemoURLStreamHandler.java

@@ -1,7 +1,14 @@
 package eu.siacs.conversations.http;
 
-/**
- * Created by daniel on 2/7/17.
- */
-public class OmemoURLStreamHandler {
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLStreamHandler;
+
+
+public class OmemoURLStreamHandler extends URLStreamHandler {
+    @Override
+    protected URLConnection openConnection(URL url) throws IOException {
+        return new URL("https"+url.toString().substring(5)).openConnection();
+    }
 }

src/main/java/eu/siacs/conversations/http/OmemoURLStreamHandlerFactory.java

@@ -1,7 +1,15 @@
 package eu.siacs.conversations.http;
 
-/**
- * Created by daniel on 2/7/17.
- */
-public class OmemoURLStreamHandlerFactory {
+import java.net.URLStreamHandler;
+import java.net.URLStreamHandlerFactory;
+
+public class OmemoURLStreamHandlerFactory implements URLStreamHandlerFactory {
+    @Override
+    public URLStreamHandler createURLStreamHandler(String protocol) {
+        if ("omemo".equals(protocol)) {
+            return new OmemoURLStreamHandler();
+        } else {
+            return null;
+        }
+    }
 }

src/main/java/eu/siacs/conversations/services/XmppConnectionService.java

@@ -48,6 +48,7 @@ import org.openintents.openpgp.util.OpenPgpServiceConnection;
 import java.io.FileDescriptor;
 import java.io.FileNotFoundException;
 import java.math.BigInteger;
+import java.net.URL;
 import java.security.SecureRandom;
 import java.security.cert.CertificateException;
 import java.security.cert.X509Certificate;
@@ -95,6 +96,7 @@ import eu.siacs.conversations.generator.IqGenerator;
 import eu.siacs.conversations.generator.MessageGenerator;
 import eu.siacs.conversations.generator.PresenceGenerator;
 import eu.siacs.conversations.http.HttpConnectionManager;
+import eu.siacs.conversations.http.OmemoURLStreamHandlerFactory;
 import eu.siacs.conversations.parser.AbstractParser;
 import eu.siacs.conversations.parser.IqParser;
 import eu.siacs.conversations.parser.MessageParser;
@@ -142,6 +144,10 @@ import me.leolin.shortcutbadger.ShortcutBadger;
 
 public class XmppConnectionService extends Service {
 
+	static {
+		URL.setURLStreamHandlerFactory(new OmemoURLStreamHandlerFactory());
+	}
+
 	public static final String ACTION_REPLY_TO_CONVERSATION = "reply_to_conversations";
 	public static final String ACTION_CLEAR_NOTIFICATION = "clear_notification";
 	public static final String ACTION_DISABLE_FOREGROUND = "disable_foreground";