Fix groups for upgraded clients

[signal-cli] / src / main / java / cli / Manager.java

diff --git a/src/main/java/cli/Manager.java b/src/main/java/cli/Manager.java
index cd5f6305aa6721ee4dcf10fdc0edaff2eaeba9d1..cc81c14d74084ca55c90e46d1ca7d9643207ce02 100644 (file)
--- a/src/main/java/cli/Manager.java
+++ b/src/main/java/cli/Manager.java
@@ -1,26 +1,31 @@
 /**
  * Copyright (C) 2015 AsamK
 /**
  * Copyright (C) 2015 AsamK

- * <p>
+ *

  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.

- * <p>
+ *

  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.

- * <p>
+ *

  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 package cli;
 
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 package cli;
 

-import org.apache.commons.io.IOUtils;
-import org.json.JSONObject;
-import org.whispersystems.libaxolotl.IdentityKeyPair;
-import org.whispersystems.libaxolotl.InvalidKeyException;
-import org.whispersystems.libaxolotl.InvalidVersionException;
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.PropertyAccessor;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.whispersystems.libaxolotl.*;
+import org.whispersystems.libaxolotl.ecc.Curve;
+import org.whispersystems.libaxolotl.ecc.ECKeyPair;

 import org.whispersystems.libaxolotl.state.PreKeyRecord;
 import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
 import org.whispersystems.libaxolotl.util.KeyHelper;
 import org.whispersystems.libaxolotl.state.PreKeyRecord;
 import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
 import org.whispersystems.libaxolotl.util.KeyHelper;


@@ -31,81 +36,119 @@ import org.whispersystems.textsecure.api.TextSecureMessagePipe;
 import org.whispersystems.textsecure.api.TextSecureMessageReceiver;
 import org.whispersystems.textsecure.api.TextSecureMessageSender;
 import org.whispersystems.textsecure.api.crypto.TextSecureCipher;
 import org.whispersystems.textsecure.api.TextSecureMessageReceiver;
 import org.whispersystems.textsecure.api.TextSecureMessageSender;
 import org.whispersystems.textsecure.api.crypto.TextSecureCipher;

-import org.whispersystems.textsecure.api.messages.TextSecureContent;
-import org.whispersystems.textsecure.api.messages.TextSecureEnvelope;
+import org.whispersystems.textsecure.api.messages.*;

 import org.whispersystems.textsecure.api.push.TextSecureAddress;
 import org.whispersystems.textsecure.api.push.TrustStore;
 import org.whispersystems.textsecure.api.push.TextSecureAddress;
 import org.whispersystems.textsecure.api.push.TrustStore;

+import org.whispersystems.textsecure.api.push.exceptions.EncapsulatedExceptions;

 import org.whispersystems.textsecure.api.util.InvalidNumberException;
 import org.whispersystems.textsecure.api.util.PhoneNumberFormatter;
 
 import java.io.*;
 import org.whispersystems.textsecure.api.util.InvalidNumberException;
 import org.whispersystems.textsecure.api.util.PhoneNumberFormatter;
 
 import java.io.*;

-import java.util.List;
+import java.util.*;

 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 

-public class Manager {
+class Manager {

     private final static String URL = "https://textsecure-service.whispersystems.org";
     private final static TrustStore TRUST_STORE = new WhisperTrustStore();
 
     private final static String URL = "https://textsecure-service.whispersystems.org";
     private final static TrustStore TRUST_STORE = new WhisperTrustStore();
 

+    public final static String PROJECT_NAME = Manager.class.getPackage().getImplementationTitle();
+    public final static String PROJECT_VERSION = Manager.class.getPackage().getImplementationVersion();
+    private final static String USER_AGENT = PROJECT_NAME + " " + PROJECT_VERSION;
+

     private final static String settingsPath = System.getProperty("user.home") + "/.config/textsecure";
     private final static String settingsPath = System.getProperty("user.home") + "/.config/textsecure";

+    private final static String dataPath = settingsPath + "/data";
+    private final static String attachmentsPath = settingsPath + "/attachments";

 
 

+    private final ObjectMapper jsonProcessot = new ObjectMapper();

     private String username;
     private String password;
     private String signalingKey;
     private String username;
     private String password;
     private String signalingKey;

+    private int preKeyIdOffset;
+    private int nextSignedPreKeyId;

 
     private boolean registered = false;
 
     private JsonAxolotlStore axolotlStore;
 
     private boolean registered = false;
 
     private JsonAxolotlStore axolotlStore;

-    TextSecureAccountManager accountManager;
+    private TextSecureAccountManager accountManager;
+    private JsonGroupStore groupStore;

 
     public Manager(String username) {
         this.username = username;
 
     public Manager(String username) {
         this.username = username;

+        jsonProcessot.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE); // disable autodetect
+        jsonProcessot.enable(SerializationFeature.INDENT_OUTPUT); // for pretty print, you can disable it.
+        jsonProcessot.enable(SerializationFeature.WRITE_NULL_MAP_VALUES);
+        jsonProcessot.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);

     }
 
     }
 

-    private String getFileName() {
-        String path = settingsPath + "/data";
-        new File(path).mkdirs();
-        return path + "/" + username;
+    public String getFileName() {
+        new File(dataPath).mkdirs();
+        return dataPath + "/" + username;

     }
 
     public boolean userExists() {
         File f = new File(getFileName());
     }
 
     public boolean userExists() {
         File f = new File(getFileName());

-        if (!f.exists() || f.isDirectory()) {
-            return false;
-        }
-        return true;
+        return !(!f.exists() || f.isDirectory());

     }
 
     public boolean userHasKeys() {
         return axolotlStore != null;
     }
 
     }
 
     public boolean userHasKeys() {
         return axolotlStore != null;
     }
 

+    private JsonNode getNotNullNode(JsonNode parent, String name) throws InvalidObjectException {
+        JsonNode node = parent.get(name);
+        if (node == null) {
+            throw new InvalidObjectException(String.format("Incorrect file format: expected parameter %s not found ", name));
+        }
+
+        return node;
+    }
+

     public void load() throws IOException, InvalidKeyException {
     public void load() throws IOException, InvalidKeyException {

-        JSONObject in = new JSONObject(IOUtils.toString(new FileInputStream(getFileName())));
-        username = in.getString("username");
-        password = in.getString("password");
-        if (in.has("signalingKey")) {
-            signalingKey = in.getString("signalingKey");
+        JsonNode rootNode = jsonProcessot.readTree(new File(getFileName()));
+
+        username = getNotNullNode(rootNode, "username").asText();
+        password = getNotNullNode(rootNode, "password").asText();
+        if (rootNode.has("signalingKey")) {
+            signalingKey = getNotNullNode(rootNode, "signalingKey").asText();
+        }
+        if (rootNode.has("preKeyIdOffset")) {
+            preKeyIdOffset = getNotNullNode(rootNode, "preKeyIdOffset").asInt(0);
+        } else {
+            preKeyIdOffset = 0;
+        }
+        if (rootNode.has("nextSignedPreKeyId")) {
+            nextSignedPreKeyId = getNotNullNode(rootNode, "nextSignedPreKeyId").asInt();
+        } else {
+            nextSignedPreKeyId = 0;
+        }
+        axolotlStore = jsonProcessot.convertValue(getNotNullNode(rootNode, "axolotlStore"), JsonAxolotlStore.class); //new JsonAxolotlStore(in.getJSONObject("axolotlStore"));
+        registered = getNotNullNode(rootNode, "registered").asBoolean();
+        JsonNode groupStoreNode = rootNode.get("groupStore");
+        if (groupStoreNode != null) {
+            groupStore = jsonProcessot.convertValue(groupStoreNode, JsonGroupStore.class);

         }
         }

-        axolotlStore = new JsonAxolotlStore(in.getJSONObject("axolotlStore"));
-        registered = in.getBoolean("registered");
-        accountManager = new TextSecureAccountManager(URL, TRUST_STORE, username, password);
+        if (groupStore == null) {
+            groupStore = new JsonGroupStore();
+        }
+        accountManager = new TextSecureAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);

     }
 
     public void save() {
     }
 
     public void save() {

-        String out = new JSONObject().put("username", username)
+        ObjectNode rootNode = jsonProcessot.createObjectNode();
+        rootNode.put("username", username)

                 .put("password", password)
                 .put("signalingKey", signalingKey)
                 .put("password", password)
                 .put("signalingKey", signalingKey)

-                .put("axolotlStore", axolotlStore.getJson())
-                .put("registered", registered).toString();
+                .put("preKeyIdOffset", preKeyIdOffset)
+                .put("nextSignedPreKeyId", nextSignedPreKeyId)
+                .put("registered", registered)
+                .putPOJO("axolotlStore", axolotlStore)
+                .putPOJO("groupStore", groupStore)
+        ;

         try {
         try {

-            OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(getFileName()));
-            writer.write(out);
-            writer.flush();
-            writer.close();
+            jsonProcessot.writeValue(new File(getFileName()), rootNode);

         } catch (Exception e) {
         } catch (Exception e) {

-            System.out.println("Saving file error: " + e.getMessage());
-            return;
+            System.err.println(String.format("Error saving file: %s", e.getMessage()));

         }
     }
 
         }
     }
 


@@ -113,6 +156,7 @@ public class Manager {
         IdentityKeyPair identityKey = KeyHelper.generateIdentityKeyPair();
         int registrationId = KeyHelper.generateRegistrationId(false);
         axolotlStore = new JsonAxolotlStore(identityKey, registrationId);
         IdentityKeyPair identityKey = KeyHelper.generateIdentityKeyPair();
         int registrationId = KeyHelper.generateRegistrationId(false);
         axolotlStore = new JsonAxolotlStore(identityKey, registrationId);

+        groupStore = new JsonGroupStore();

         registered = false;
     }
 
         registered = false;
     }
 


@@ -123,7 +167,7 @@ public class Manager {
     public void register(boolean voiceVerication) throws IOException {
         password = Util.getSecret(18);
 
     public void register(boolean voiceVerication) throws IOException {
         password = Util.getSecret(18);
 

-        accountManager = new TextSecureAccountManager(URL, TRUST_STORE, username, password);
+        accountManager = new TextSecureAccountManager(URL, TRUST_STORE, username, password, USER_AGENT);

 
         if (voiceVerication)
             accountManager.requestVoiceVerificationCode();
 
         if (voiceVerication)
             accountManager.requestVoiceVerificationCode();


@@ -133,42 +177,99 @@ public class Manager {
         registered = false;
     }
 
         registered = false;
     }
 

+    private static final int BATCH_SIZE = 100;
+
+    private List<PreKeyRecord> generatePreKeys() {
+        List<PreKeyRecord> records = new LinkedList<>();
+
+        for (int i = 0; i < BATCH_SIZE; i++) {
+            int preKeyId = (preKeyIdOffset + i) % Medium.MAX_VALUE;
+            ECKeyPair keyPair = Curve.generateKeyPair();
+            PreKeyRecord record = new PreKeyRecord(preKeyId, keyPair);
+
+            axolotlStore.storePreKey(preKeyId, record);
+            records.add(record);
+        }
+
+        preKeyIdOffset = (preKeyIdOffset + BATCH_SIZE + 1) % Medium.MAX_VALUE;
+        return records;
+    }
+
+    private PreKeyRecord generateLastResortPreKey() {
+        if (axolotlStore.containsPreKey(Medium.MAX_VALUE)) {
+            try {
+                return axolotlStore.loadPreKey(Medium.MAX_VALUE);
+            } catch (InvalidKeyIdException e) {
+                axolotlStore.removePreKey(Medium.MAX_VALUE);
+            }
+        }
+
+        ECKeyPair keyPair = Curve.generateKeyPair();
+        PreKeyRecord record = new PreKeyRecord(Medium.MAX_VALUE, keyPair);
+
+        axolotlStore.storePreKey(Medium.MAX_VALUE, record);
+
+        return record;
+    }
+
+    private SignedPreKeyRecord generateSignedPreKey(IdentityKeyPair identityKeyPair) {
+        try {
+            ECKeyPair keyPair = Curve.generateKeyPair();
+            byte[] signature = Curve.calculateSignature(identityKeyPair.getPrivateKey(), keyPair.getPublicKey().serialize());
+            SignedPreKeyRecord record = new SignedPreKeyRecord(nextSignedPreKeyId, System.currentTimeMillis(), keyPair, signature);
+
+            axolotlStore.storeSignedPreKey(nextSignedPreKeyId, record);
+            nextSignedPreKeyId = (nextSignedPreKeyId + 1) % Medium.MAX_VALUE;
+
+            return record;
+        } catch (InvalidKeyException e) {
+            throw new AssertionError(e);
+        }
+    }
+

     public void verifyAccount(String verificationCode) throws IOException {
         verificationCode = verificationCode.replace("-", "");
         signalingKey = Util.getSecret(52);
     public void verifyAccount(String verificationCode) throws IOException {
         verificationCode = verificationCode.replace("-", "");
         signalingKey = Util.getSecret(52);

-        accountManager.verifyAccount(verificationCode, signalingKey, false, axolotlStore.getLocalRegistrationId());
+        accountManager.verifyAccountWithCode(verificationCode, signalingKey, axolotlStore.getLocalRegistrationId(), false);

 
         //accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));
         registered = true;
 
 
         //accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));
         registered = true;
 

-        int start = 0;
-        List<PreKeyRecord> oneTimePreKeys = KeyHelper.generatePreKeys(start, 100);
-        for (int i = start; i < oneTimePreKeys.size(); i++) {
-            axolotlStore.storePreKey(i, oneTimePreKeys.get(i));
-        }
+        List<PreKeyRecord> oneTimePreKeys = generatePreKeys();

 
 

-        PreKeyRecord lastResortKey = KeyHelper.generateLastResortPreKey();
-        axolotlStore.storePreKey(Medium.MAX_VALUE, lastResortKey);
+        PreKeyRecord lastResortKey = generateLastResortPreKey();
+
+        SignedPreKeyRecord signedPreKeyRecord = generateSignedPreKey(axolotlStore.getIdentityKeyPair());

 
 

-        int signedPreKeyId = 0;
-        SignedPreKeyRecord signedPreKeyRecord;
-        try {
-            signedPreKeyRecord = KeyHelper.generateSignedPreKey(axolotlStore.getIdentityKeyPair(), signedPreKeyId);
-            axolotlStore.storeSignedPreKey(signedPreKeyId, signedPreKeyRecord);
-        } catch (InvalidKeyException e) {
-            // Should really not happen
-            System.out.println("invalid key");
-            return;
-        }

         accountManager.setPreKeys(axolotlStore.getIdentityKeyPair().getPublicKey(), lastResortKey, signedPreKeyRecord, oneTimePreKeys);
     }
 
         accountManager.setPreKeys(axolotlStore.getIdentityKeyPair().getPublicKey(), lastResortKey, signedPreKeyRecord, oneTimePreKeys);
     }
 

-    public TextSecureMessageSender getMessageSender() {
-        return new TextSecureMessageSender(URL, TRUST_STORE, username, password,
-                axolotlStore, Optional.<TextSecureMessageSender.EventListener>absent());
+    public void sendMessage(List<String> recipients, TextSecureDataMessage message)
+            throws IOException, EncapsulatedExceptions {
+        TextSecureMessageSender messageSender = new TextSecureMessageSender(URL, TRUST_STORE, username, password,
+                axolotlStore, USER_AGENT, Optional.<TextSecureMessageSender.EventListener>absent());
+
+        Set<TextSecureAddress> recipientsTS = new HashSet<>(recipients.size());
+        for (String recipient : recipients) {
+            try {
+                recipientsTS.add(getPushAddress(recipient));
+            } catch (InvalidNumberException e) {
+                System.err.println("Failed to add recipient \"" + recipient + "\": " + e.getMessage());
+                System.err.println("Aborting sending.");
+                return;
+            }
+        }
+
+        messageSender.sendMessage(new ArrayList<>(recipientsTS), message);
+
+        if (message.isEndSession()) {
+            for (TextSecureAddress recipient : recipientsTS) {
+                handleEndSession(recipient.getNumber());
+            }
+        }

     }
 
     }
 

-    public TextSecureContent decryptMessage(TextSecureEnvelope envelope) {
+    private TextSecureContent decryptMessage(TextSecureEnvelope envelope) {

         TextSecureCipher cipher = new TextSecureCipher(new TextSecureAddress(username), axolotlStore);
         try {
             return cipher.decrypt(envelope);
         TextSecureCipher cipher = new TextSecureCipher(new TextSecureAddress(username), axolotlStore);
         try {
             return cipher.decrypt(envelope);


@@ -179,12 +280,16 @@ public class Manager {
         }
     }
 
         }
     }
 

+    private void handleEndSession(String source) {
+        axolotlStore.deleteAllSessions(source);
+    }
+

     public interface ReceiveMessageHandler {
     public interface ReceiveMessageHandler {

-        void handleMessage(TextSecureEnvelope envelope);
+        void handleMessage(TextSecureEnvelope envelope, TextSecureContent decryptedContent, GroupInfo group);

     }
 
     }
 

-    public void receiveMessages(ReceiveMessageHandler handler) throws IOException {
-        TextSecureMessageReceiver messageReceiver = new TextSecureMessageReceiver(URL, TRUST_STORE, username, password, signalingKey);
+    public void receiveMessages(int timeoutSeconds, boolean returnOnTimeout, ReceiveMessageHandler handler) throws IOException {
+        final TextSecureMessageReceiver messageReceiver = new TextSecureMessageReceiver(URL, TRUST_STORE, username, password, signalingKey, USER_AGENT);

         TextSecureMessagePipe messagePipe = null;
 
         try {
         TextSecureMessagePipe messagePipe = null;
 
         try {


@@ -192,12 +297,81 @@ public class Manager {
 
             while (true) {
                 TextSecureEnvelope envelope;
 
             while (true) {
                 TextSecureEnvelope envelope;

+                TextSecureContent content = null;
+                GroupInfo group = null;

                 try {
                 try {

-                    envelope = messagePipe.read(1, TimeUnit.MINUTES);
-                    handler.handleMessage(envelope);
+                    envelope = messagePipe.read(timeoutSeconds, TimeUnit.SECONDS);
+                    if (!envelope.isReceipt()) {
+                        content = decryptMessage(envelope);
+                        if (content != null) {
+                            if (content.getDataMessage().isPresent()) {
+                                TextSecureDataMessage message = content.getDataMessage().get();
+                                if (message.getGroupInfo().isPresent()) {
+                                    TextSecureGroup groupInfo = message.getGroupInfo().get();
+                                    switch (groupInfo.getType()) {
+                                        case UPDATE:
+                                            group = groupStore.getGroup(groupInfo.getGroupId());
+                                            if (group == null) {
+                                                group = new GroupInfo(groupInfo.getGroupId());
+                                            }
+
+                                            if (groupInfo.getAvatar().isPresent()) {
+                                                TextSecureAttachment avatar = groupInfo.getAvatar().get();
+                                                if (avatar.isPointer()) {
+                                                    long avatarId = avatar.asPointer().getId();
+                                                    try {
+                                                        retrieveAttachment(avatar.asPointer());
+                                                        group.avatarId = avatarId;
+                                                    } catch (IOException | InvalidMessageException e) {
+                                                        System.err.println("Failed to retrieve group avatar (" + avatarId + "): " + e.getMessage());
+                                                    }
+                                                }
+                                            }
+
+                                            if (groupInfo.getName().isPresent()) {
+                                                group.name = groupInfo.getName().get();
+                                            }
+
+                                            if (groupInfo.getMembers().isPresent()) {
+                                                group.members.addAll(groupInfo.getMembers().get());
+                                            }
+
+                                            groupStore.updateGroup(group);
+                                            break;
+                                        case DELIVER:
+                                            group = groupStore.getGroup(groupInfo.getGroupId());
+                                            break;
+                                        case QUIT:
+                                            group = groupStore.getGroup(groupInfo.getGroupId());
+                                            if (group != null) {
+                                                group.members.remove(envelope.getSource());
+                                            }
+                                            break;
+                                    }
+                                }
+                                if (message.isEndSession()) {
+                                    handleEndSession(envelope.getSource());
+                                }
+                                if (message.getAttachments().isPresent()) {
+                                    for (TextSecureAttachment attachment : message.getAttachments().get()) {
+                                        if (attachment.isPointer()) {
+                                            try {
+                                                retrieveAttachment(attachment.asPointer());
+                                            } catch (IOException | InvalidMessageException e) {
+                                                System.err.println("Failed to retrieve attachment (" + attachment.asPointer().getId() + "): " + e.getMessage());
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                    handler.handleMessage(envelope, content, group);

                 } catch (TimeoutException e) {
                 } catch (TimeoutException e) {

+                    if (returnOnTimeout)
+                        return;

                 } catch (InvalidVersionException e) {
                 } catch (InvalidVersionException e) {

-                    System.out.println("Ignoring error: " + e.getMessage());
+                    System.err.println("Ignoring error: " + e.getMessage());

                 }
                 save();
             }
                 }
                 save();
             }


@@ -206,4 +380,77 @@ public class Manager {
                 messagePipe.shutdown();
         }
     }
                 messagePipe.shutdown();
         }
     }

+
+    public File getAttachmentFile(long attachmentId) {
+        return new File(attachmentsPath + "/" + attachmentId);
+    }
+
+    private File retrieveAttachment(TextSecureAttachmentPointer pointer) throws IOException, InvalidMessageException {
+        final TextSecureMessageReceiver messageReceiver = new TextSecureMessageReceiver(URL, TRUST_STORE, username, password, signalingKey, USER_AGENT);
+
+        File tmpFile = File.createTempFile("ts_attach_" + pointer.getId(), ".tmp");
+        InputStream input = messageReceiver.retrieveAttachment(pointer, tmpFile);
+
+        new File(attachmentsPath).mkdirs();
+        File outputFile = getAttachmentFile(pointer.getId());
+        OutputStream output = null;
+        try {
+            output = new FileOutputStream(outputFile);
+            byte[] buffer = new byte[4096];
+            int read;
+
+            while ((read = input.read(buffer)) != -1) {
+                output.write(buffer, 0, read);
+            }
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+            return null;
+        } finally {
+            if (output != null) {
+                output.close();
+                output = null;
+            }
+            if (!tmpFile.delete()) {
+                System.err.println("Failed to delete temp file: " + tmpFile);
+            }
+        }
+        if (pointer.getPreview().isPresent()) {
+            File previewFile = new File(outputFile + ".preview");
+            try {
+                output = new FileOutputStream(previewFile);
+                byte[] preview = pointer.getPreview().get();
+                output.write(preview, 0, preview.length);
+            } catch (FileNotFoundException e) {
+                e.printStackTrace();
+                return null;
+            } finally {
+                if (output != null) {
+                    output.close();
+                }
+            }
+        }
+        return outputFile;
+    }
+
+    public String canonicalizeNumber(String number) throws InvalidNumberException {
+        String localNumber = username;
+        return PhoneNumberFormatter.formatNumber(number, localNumber);
+    }
+
+    private TextSecureAddress getPushAddress(String number) throws InvalidNumberException {
+        String e164number = canonicalizeNumber(number);
+        return new TextSecureAddress(e164number);
+    }
+
+    public GroupInfo getGroupInfo(byte[] groupId) {
+        return groupStore.getGroup(groupId);
+    }
+
+    public void setGroupInfo(GroupInfo group) {
+        groupStore.updateGroup(group);
+    }
+
+    public String getUsername() {
+        return username;
+    }

 }
 }