From 29a849cb92c0dc902acd3aa54d0d2f07583bce72 Mon Sep 17 00:00:00 2001
From: fiaxh <github@lightrise.org>
Date: Thu, 15 Oct 2015 23:21:47 +0100
Subject: Decrypt PGP messages in background

---
 .../conversations/crypto/PgpDecryptionService.java | 162 +++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 src/main/java/eu/siacs/conversations/crypto/PgpDecryptionService.java

(limited to 'src/main/java/eu/siacs/conversations/crypto/PgpDecryptionService.java')

diff --git a/src/main/java/eu/siacs/conversations/crypto/PgpDecryptionService.java b/src/main/java/eu/siacs/conversations/crypto/PgpDecryptionService.java
new file mode 100644
index 000000000..ed67dc65f
--- /dev/null
+++ b/src/main/java/eu/siacs/conversations/crypto/PgpDecryptionService.java
@@ -0,0 +1,162 @@
+package eu.siacs.conversations.crypto;
+
+import android.app.PendingIntent;
+
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.services.XmppConnectionService;
+import eu.siacs.conversations.ui.UiCallback;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class PgpDecryptionService {
+
+	private final XmppConnectionService xmppConnectionService;
+	private final ConcurrentHashMap<String, List<Message>> messages = new ConcurrentHashMap<>();
+	private final ConcurrentHashMap<String, Boolean> decryptingMessages = new ConcurrentHashMap<>();
+	private Boolean keychainLocked = false;
+	private final Object keychainLockedLock = new Object();
+
+	public PgpDecryptionService(XmppConnectionService xmppConnectionService) {
+		this.xmppConnectionService = xmppConnectionService;
+	}
+
+	public void add(Message message) {
+		if (isRunning()) {
+			decryptDirectly(message);
+		} else {
+			store(message);
+		}
+	}
+
+	public void addAll(List<Message> messagesList) {
+		if (!messagesList.isEmpty()) {
+			String conversationUuid = messagesList.get(0).getConversation().getUuid();
+			if (!messages.containsKey(conversationUuid)) {
+				List<Message> list = Collections.synchronizedList(new LinkedList<Message>());
+				messages.put(conversationUuid, list);
+			}
+			synchronized (messages.get(conversationUuid)) {
+				messages.get(conversationUuid).addAll(messagesList);
+			}
+			decryptAllMessages();
+		}
+	}
+
+	public void onKeychainUnlocked() {
+		synchronized (keychainLockedLock) {
+			keychainLocked = false;
+		}
+		decryptAllMessages();
+	}
+
+	public void onKeychainLocked() {
+		synchronized (keychainLockedLock) {
+			keychainLocked = true;
+		}
+		xmppConnectionService.updateConversationUi();
+	}
+
+	public void onOpenPgpServiceBound() {
+		decryptAllMessages();
+	}
+
+	public boolean isRunning() {
+		synchronized (keychainLockedLock) {
+			return !keychainLocked;
+		}
+	}
+
+	private void store(Message message) {
+		if (messages.containsKey(message.getConversation().getUuid())) {
+			messages.get(message.getConversation().getUuid()).add(message);
+		} else {
+			List<Message> messageList = Collections.synchronizedList(new LinkedList<Message>());
+			messageList.add(message);
+			messages.put(message.getConversation().getUuid(), messageList);
+		}
+	}
+
+	private void decryptAllMessages() {
+		for (String uuid : messages.keySet()) {
+			decryptMessages(uuid);
+		}
+	}
+
+	private void decryptMessages(final String uuid) {
+		synchronized (decryptingMessages) {
+			Boolean decrypting = decryptingMessages.get(uuid);
+			if ((decrypting != null && !decrypting) || decrypting == null) {
+				decryptingMessages.put(uuid, true);
+				decryptMessage(uuid);
+			}
+		}
+	}
+
+	private void decryptMessage(final String uuid) {
+		Message message = null;
+		synchronized (messages.get(uuid)) {
+			while (!messages.get(uuid).isEmpty()) {
+				if (messages.get(uuid).get(0).getEncryption() == Message.ENCRYPTION_PGP) {
+					if (isRunning()) {
+						message = messages.get(uuid).remove(0);
+					}
+					break;
+				} else {
+					messages.get(uuid).remove(0);
+				}
+			}
+			if (message != null && xmppConnectionService.getPgpEngine() != null) {
+				xmppConnectionService.getPgpEngine().decrypt(message, new UiCallback<Message>() {
+
+					@Override
+					public void userInputRequried(PendingIntent pi, Message message) {
+						messages.get(uuid).add(0, message);
+						decryptingMessages.put(uuid, false);
+					}
+
+					@Override
+					public void success(Message message) {
+						xmppConnectionService.updateConversationUi();
+						decryptMessage(uuid);
+					}
+
+					@Override
+					public void error(int error, Message message) {
+						message.setEncryption(Message.ENCRYPTION_DECRYPTION_FAILED);
+						xmppConnectionService.updateConversationUi();
+						decryptMessage(uuid);
+					}
+				});
+			} else {
+				decryptingMessages.put(uuid, false);
+			}
+		}
+	}
+
+	private void decryptDirectly(final Message message) {
+		if (message.getEncryption() == Message.ENCRYPTION_PGP && xmppConnectionService.getPgpEngine() != null) {
+			xmppConnectionService.getPgpEngine().decrypt(message, new UiCallback<Message>() {
+
+				@Override
+				public void userInputRequried(PendingIntent pi, Message message) {
+					store(message);
+				}
+
+				@Override
+				public void success(Message message) {
+					xmppConnectionService.updateConversationUi();
+					xmppConnectionService.getNotificationService().updateNotification(false);
+				}
+
+				@Override
+				public void error(int error, Message message) {
+					message.setEncryption(Message.ENCRYPTION_DECRYPTION_FAILED);
+					xmppConnectionService.updateConversationUi();
+				}
+			});
+		}
+	}
+}
-- 
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