From 132b27adeef3ab4d305facda7dd035015b00766f Mon Sep 17 00:00:00 2001
From: steckbrief <steckbrief@chefmail.de>
Date: Sat, 5 May 2018 20:28:04 +0200
Subject: introduces new message state model

---
 .../crypto/otr/OtrMessageParser.java               | 67 ++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrMessageParser.java

(limited to 'src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrMessageParser.java')

diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrMessageParser.java b/src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrMessageParser.java
new file mode 100644
index 00000000..8791bff3
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrMessageParser.java
@@ -0,0 +1,67 @@
+package de.thedevstack.conversationsplus.crypto.otr;
+
+import net.java.otr4j.session.Session;
+import net.java.otr4j.session.SessionStatus;
+
+import de.thedevstack.conversationsplus.crypto.OtrService;
+import de.thedevstack.conversationsplus.entities.Conversation;
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.utils.CryptoHelper;
+import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
+import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+
+/**
+ */
+public class OtrMessageParser {
+    public static Message parseOtrChat(String body, Jid from, String id, Conversation conversation) {
+        String presence;
+        if (from.isBareJid()) {
+            presence = "";
+        } else {
+            presence = from.getResourcepart();
+        }
+        if (body.matches("^\\?OTRv\\d{1,2}\\?.*")) {
+            conversation.endOtrIfNeeded();
+        }
+        if (!conversation.hasValidOtrSession()) {
+            conversation.startOtrSession(presence,false);
+        } else {
+            String foreignPresence = conversation.getOtrSession().getSessionID().getUserID();
+            if (!foreignPresence.equals(presence)) {
+                conversation.endOtrIfNeeded();
+                conversation.startOtrSession(presence, false);
+            }
+        }
+        try {
+            conversation.setLastReceivedOtrMessageId(id);
+            Session otrSession = conversation.getOtrSession();
+            body = otrSession.transformReceiving(body);
+            SessionStatus status = otrSession.getSessionStatus();
+            if (body == null && status == SessionStatus.ENCRYPTED) {
+                XmppConnectionServiceAccessor.xmppConnectionService.onOtrSessionEstablished(conversation);
+                return null;
+            } else if (body == null && status == SessionStatus.FINISHED) {
+                conversation.resetOtrSession();
+                UiUpdateHelper.updateConversationUi();
+                return null;
+            } else if (body == null || (body.isEmpty())) {
+                return null;
+            }
+            if (body.startsWith(CryptoHelper.FILETRANSFER)) {
+                String key = body.substring(CryptoHelper.FILETRANSFER.length());
+                conversation.setSymmetricKey(CryptoHelper.hexToBytes(key));
+                return null;
+            }
+            final OtrService otrService = conversation.getAccount().getOtrService();
+            Message finishedMessage = new Message(conversation, body, Message.ENCRYPTION_OTR);
+            finishedMessage.setFingerprint(otrService.getFingerprint(otrSession.getRemotePublicKey()));
+            conversation.setLastReceivedOtrMessageId(null);
+
+            return finishedMessage;
+        } catch (Exception e) {
+            conversation.resetOtrSession();
+            return null;
+        }
+    }
+}
-- 
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