Unset all PGP signatures once

... so they will be redone to match the changed status.

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

@@ -413,13 +413,13 @@ public class Account extends AbstractEntity {
 	}
 
 	public String getPgpSignature() {
-		if (keys.has(KEY_PGP_SIGNATURE)) {
 		try {
+			if (keys.has(KEY_PGP_SIGNATURE) && !"null".equals(keys.getString(KEY_PGP_SIGNATURE))) {
 				return keys.getString(KEY_PGP_SIGNATURE);
-			} catch (final JSONException e) {
+			} else {
 				return null;
 			}
-		} else {
+		} catch (final JSONException e) {
 			return null;
 		}
 	}
@@ -433,6 +433,15 @@ public class Account extends AbstractEntity {
 		return true;
 	}
 
+	public boolean unsetPgpSignature() {
+		try {
+			keys.put(KEY_PGP_SIGNATURE, JSONObject.NULL);
+		} catch (JSONException e) {
+			return false;
+		}
+		return true;
+	}
+
 	public long getPgpId() {
 		if (keys.has(KEY_PGP_ID)) {
 			try {

src/main/java/eu/siacs/conversations/persistance/DatabaseBackend.java

@@ -43,7 +43,7 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 	private static DatabaseBackend instance = null;
 
 	private static final String DATABASE_NAME = "history";
-	private static final int DATABASE_VERSION = 20;
+	private static final int DATABASE_VERSION = 21;
 
 	private static String CREATE_CONTATCS_STATEMENT = "create table "
 			+ Contact.TABLENAME + "(" + Contact.ACCOUNT + " TEXT, "
@@ -335,6 +335,15 @@ public class DatabaseBackend extends SQLiteOpenHelper {
 		if (oldVersion < 18 && newVersion >= 18) {
 			db.execSQL("ALTER TABLE " + Message.TABLENAME + " ADD COLUMN " + Message.READ + " NUMBER DEFAULT 1");
 		}
+
+		if (oldVersion < 21 && newVersion >= 21) {
+			List<Account> accounts = getAccounts(db);
+			for (Account account : accounts) {
+				account.unsetPgpSignature();
+				db.update(Account.TABLENAME, account.getContentValues(), Account.UUID
+						+ "=?", new String[]{account.getUuid()});
+			}
+		}
 	}
 
 	public static synchronized DatabaseBackend getInstance(Context context) {

src/main/java/eu/siacs/conversations/ui/ConversationFragment.java

@@ -1062,7 +1062,14 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 		final ConversationActivity activity = (ConversationActivity) getActivity();
 		final XmppConnectionService xmppService = activity.xmppConnectionService;
 		final Contact contact = message.getConversation().getContact();
-		if (activity.hasPgp()) {
+		if (!activity.hasPgp()) {
+			activity.showInstallPgpDialog();
+			return;
+		}
+		if (conversation.getAccount().getPgpSignature() == null) {
+			activity.announcePgp(conversation.getAccount(), conversation);
+			return;
+		}
 		if (conversation.getMode() == Conversation.MODE_SINGLE) {
 			if (contact.getPgpKeyId() != 0) {
 				xmppService.getPgpEngine().hasKey(contact,
@@ -1084,7 +1091,7 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 
 							@Override
 							public void error(int error, Contact contact) {
-
+								System.out.println();
 							}
 						});
 
@@ -1135,9 +1142,6 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 						});
 			}
 		}
-		} else {
-			activity.showInstallPgpDialog();
-		}
 	}
 
 	public void showNoPGPKeyDialog(boolean plural,