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 ++++++++++++++++++++++
 .../conversationsplus/crypto/otr/OtrUtil.java      | 39 +++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100644 src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrMessageParser.java
 create mode 100644 src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrUtil.java

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

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;
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrUtil.java b/src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrUtil.java
new file mode 100644
index 00000000..97075455
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/crypto/otr/OtrUtil.java
@@ -0,0 +1,39 @@
+package de.thedevstack.conversationsplus.crypto.otr;
+
+import net.java.otr4j.session.SessionID;
+import net.java.otr4j.session.SessionImpl;
+
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.entities.Conversation;
+import de.thedevstack.conversationsplus.xmpp.Forwarded;
+import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+import de.thedevstack.conversationsplus.xmpp.stanzas.MessagePacket;
+
+/**
+ */
+public class OtrUtil {
+    public static boolean isOtrSessionActive(Conversation conversation) {
+        return null != conversation && null != conversation.getOtrSession();
+    }
+
+    public static boolean isCounterpartOfActiveOtrSession(Conversation conversation, Jid counterpart) {
+        SessionImpl otrSession = (null != conversation) ? conversation.getOtrSession() : null;
+        SessionID sessionID = (null != otrSession) ? otrSession.getSessionID() : null;
+        String userID = (null != sessionID) ? sessionID.getUserID() : null;
+
+        return null != userID && null != counterpart && userID.equals(counterpart.getResourcepart());
+    }
+
+    public static boolean isValidOtrMessagePacket(MessagePacket messagePacket, Account account) {
+        Jid to = messagePacket.getTo();
+        boolean isProperlyAddressed = (to != null) && (!to.isBareJid() || account.countPresences() <= 1);
+        boolean isNotTypeGroupChat = messagePacket.getType() != MessagePacket.TYPE_GROUPCHAT;
+        boolean isNotForwarded = !messagePacket.hasChildRecursive(Forwarded.FORWARDED);
+
+        return isProperlyAddressed && isNotTypeGroupChat && isNotForwarded;
+    }
+
+    public static boolean isOtrBody(String body) {
+        return body != null && body.startsWith("?OTR");
+    }
+}
-- 
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