The image url is dynamic according to the server

app/src/main/java/chat/rocket/android/fragment/chatroom/RocketChatAbsoluteUrl.java

+package chat.rocket.android.fragment.chatroom;
+
+import chat.rocket.android.widget.AbsoluteUrl;
+import chat.rocket.core.models.ServerInfo;
+import chat.rocket.core.models.Session;
+import chat.rocket.core.models.User;
+
+public class RocketChatAbsoluteUrl implements AbsoluteUrl {
+
+  private final String baseUrl;
+  private final String userId;
+  private final String token;
+
+  public RocketChatAbsoluteUrl(ServerInfo info, User user, Session session) {
+    baseUrl = (info.isSecure() ? "https://" : "http://") + info.getHostname();
+    userId = user.getId();
+    token = session.getToken();
+  }
+
+  @Override
+  public String getAbsolute(String url) {
+    return url.startsWith("/") ? baseUrl + url + "?rc_uid=" + userId + "&rc_token=" + token : url;
+  }
+}

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomContract.java

@@ -11,6 +11,8 @@ public interface RoomContract {
 
   interface View extends BaseContract.View {
 
+    void setupWith(RocketChatAbsoluteUrl rocketChatAbsoluteUrl);
+
     void render(Room room);
 
     void updateHistoryState(boolean hasNext, boolean isLoaded);
@@ -34,6 +36,8 @@ public interface RoomContract {
 
     void loadMoreMessages();
 
+    void onViewSetup();
+
     void onMessageSelected(@Nullable Message message);
 
     void sendMessage(String messageText);

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomFragment.java

@@ -29,6 +29,7 @@ import chat.rocket.android.R;
 import chat.rocket.android.api.MethodCallHelper;
 import chat.rocket.android.fragment.chatroom.dialog.FileUploadProgressDialogFragment;
 import chat.rocket.android.fragment.chatroom.dialog.UsersOfRoomDialogFragment;
+import chat.rocket.android.helper.AbsoluteUrlHelper;
 import chat.rocket.android.helper.FileUploadHelper;
 import chat.rocket.android.helper.LoadMoreScrollListener;
 import chat.rocket.android.helper.OnBackPressListener;
@@ -47,10 +48,13 @@ import chat.rocket.android.layouthelper.extra_action.upload.ImageUploadActionIte
 import chat.rocket.android.layouthelper.extra_action.upload.VideoUploadActionItem;
 import chat.rocket.android.log.RCLog;
 import chat.rocket.core.interactors.MessageInteractor;
+import chat.rocket.core.interactors.SessionInteractor;
 import chat.rocket.core.models.Message;
 import chat.rocket.core.models.Room;
 import chat.rocket.persistence.realm.repositories.RealmMessageRepository;
 import chat.rocket.persistence.realm.repositories.RealmRoomRepository;
+import chat.rocket.persistence.realm.repositories.RealmServerInfoRepository;
+import chat.rocket.persistence.realm.repositories.RealmSessionRepository;
 import chat.rocket.persistence.realm.repositories.RealmUserRepository;
 import chat.rocket.android.layouthelper.chatroom.ModelListAdapter;
 import chat.rocket.persistence.realm.RealmStore;
@@ -111,16 +115,28 @@ public class RoomFragment extends AbstractChatRoomFragment
     hostname = args.getString(HOSTNAME);
     roomId = args.getString(ROOM_ID);
 
+    RealmRoomRepository roomRepository = new RealmRoomRepository(hostname);
+
     MessageInteractor messageInteractor = new MessageInteractor(
         new RealmMessageRepository(hostname),
-        new RealmRoomRepository(hostname)
+        roomRepository
+    );
+
+    RealmUserRepository userRepository = new RealmUserRepository(hostname);
+
+    AbsoluteUrlHelper absoluteUrlHelper = new AbsoluteUrlHelper(
+        hostname,
+        new RealmServerInfoRepository(),
+        userRepository,
+        new SessionInteractor(new RealmSessionRepository(hostname))
     );
 
     presenter = new RoomPresenter(
         roomId,
-        new RealmUserRepository(hostname),
+        userRepository,
         messageInteractor,
-        new RealmRoomRepository(hostname),
+        roomRepository,
+        absoluteUrlHelper,
         new MethodCallHelper(getContext(), hostname),
         ConnectivityManager.getInstance(getContext())
     );
@@ -138,7 +154,7 @@ public class RoomFragment extends AbstractChatRoomFragment
   @Override
   protected void onSetupView() {
     RecyclerView listView = (RecyclerView) rootView.findViewById(R.id.recyclerview);
-    adapter = new MessageListAdapter(getContext(), hostname);
+    adapter = new MessageListAdapter(getContext());
     listView.setAdapter(adapter);
     adapter.setOnItemClickListener(this);
 
@@ -186,6 +202,8 @@ public class RoomFragment extends AbstractChatRoomFragment
     setupSideMenu();
     setupMessageComposer();
     setupMessageActions();
+
+    presenter.onViewSetup();
   }
 
   private void setupMessageActions() {
@@ -214,7 +232,12 @@ public class RoomFragment extends AbstractChatRoomFragment
   @Override
   public void onDestroyView() {
     RecyclerView listView = (RecyclerView) rootView.findViewById(R.id.recyclerview);
-    listView.getAdapter().unregisterAdapterDataObserver(autoScrollManager);
+    if (listView != null) {
+      RecyclerView.Adapter adapter = listView.getAdapter();
+      if (adapter != null) {
+        adapter.unregisterAdapterDataObserver(autoScrollManager);
+      }
+    }
     super.onDestroyView();
   }
 
@@ -385,6 +408,11 @@ public class RoomFragment extends AbstractChatRoomFragment
     presenter.sendMessage(messageText);
   }
 
+  @Override
+  public void setupWith(RocketChatAbsoluteUrl rocketChatAbsoluteUrl) {
+    adapter.setAbsoluteUrl(rocketChatAbsoluteUrl);
+  }
+
   @Override
   public void render(Room room) {
     String type = room.getType();
@@ -433,6 +461,9 @@ public class RoomFragment extends AbstractChatRoomFragment
 
   @Override
   public void showMessages(List<Message> messages) {
+    if (adapter == null) {
+      return;
+    }
     adapter.updateData(messages);
   }
 

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomPresenter.java

@@ -11,6 +11,7 @@ import io.reactivex.disposables.Disposable;
 
 import chat.rocket.android.BackgroundLooper;
 import chat.rocket.android.api.MethodCallHelper;
+import chat.rocket.android.helper.AbsoluteUrlHelper;
 import chat.rocket.android.helper.LogIfError;
 import chat.rocket.android.shared.BasePresenter;
 import chat.rocket.core.SyncState;
@@ -30,6 +31,7 @@ public class RoomPresenter extends BasePresenter<RoomContract.View>
   private final MessageInteractor messageInteractor;
   private final UserRepository userRepository;
   private final RoomRepository roomRepository;
+  private final AbsoluteUrlHelper absoluteUrlHelper;
   private final MethodCallHelper methodCallHelper;
   private final ConnectivityManagerApi connectivityManagerApi;
 
@@ -37,12 +39,14 @@ public class RoomPresenter extends BasePresenter<RoomContract.View>
                        UserRepository userRepository,
                        MessageInteractor messageInteractor,
                        RoomRepository roomRepository,
+                       AbsoluteUrlHelper absoluteUrlHelper,
                        MethodCallHelper methodCallHelper,
                        ConnectivityManagerApi connectivityManagerApi) {
     this.roomId = roomId;
     this.userRepository = userRepository;
     this.messageInteractor = messageInteractor;
     this.roomRepository = roomRepository;
+    this.absoluteUrlHelper = absoluteUrlHelper;
     this.methodCallHelper = methodCallHelper;
     this.connectivityManagerApi = connectivityManagerApi;
   }
@@ -72,6 +76,16 @@ public class RoomPresenter extends BasePresenter<RoomContract.View>
     addSubscription(subscription);
   }
 
+  @Override
+  public void onViewSetup() {
+    final Disposable subscription = absoluteUrlHelper.getRocketChatAbsoluteUrl()
+        .subscribeOn(AndroidSchedulers.from(BackgroundLooper.get()))
+        .observeOn(AndroidSchedulers.mainThread())
+        .subscribe(it -> view.setupWith(it.orNull()));
+
+    addSubscription(subscription);
+  }
+
   @Override
   public void loadMoreMessages() {
 

app/src/main/java/chat/rocket/android/fragment/chatroom/dialog/AbstractChatRoomDialogFragment.java

@@ -15,9 +15,8 @@ abstract class AbstractChatRoomDialogFragment extends BottomSheetDialogFragment
   protected RealmHelper realmHelper;
   protected String roomId;
 
-  protected
   @LayoutRes
-  abstract int getLayout();
+  protected abstract int getLayout();
 
   protected abstract void onSetupDialog();
 

app/src/main/java/chat/rocket/android/fragment/chatroom/dialog/UsersOfRoomDialogFragment.java

@@ -7,20 +7,30 @@ import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.TextView;
+import com.fernandocejas.arrow.optional.Optional;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.CompositeDisposable;
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.util.ArrayList;
 import java.util.List;
+import chat.rocket.android.BackgroundLooper;
 import chat.rocket.android.R;
+import chat.rocket.android.fragment.chatroom.RocketChatAbsoluteUrl;
+import chat.rocket.android.helper.AbsoluteUrlHelper;
 import chat.rocket.android.helper.LogIfError;
 import chat.rocket.android.layouthelper.chatroom.dialog.RoomUserAdapter;
 import chat.rocket.android.log.RCLog;
 import chat.rocket.core.SyncState;
+import chat.rocket.core.interactors.SessionInteractor;
 import chat.rocket.persistence.realm.models.internal.GetUsersOfRoomsProcedure;
 import chat.rocket.persistence.realm.RealmObjectObserver;
 import chat.rocket.android.service.ConnectivityManager;
+import chat.rocket.persistence.realm.repositories.RealmServerInfoRepository;
+import chat.rocket.persistence.realm.repositories.RealmSessionRepository;
+import chat.rocket.persistence.realm.repositories.RealmUserRepository;
 
 /**
  * Dialog to show members in a room.
@@ -31,6 +41,8 @@ public class UsersOfRoomDialogFragment extends AbstractChatRoomDialogFragment {
   private RealmObjectObserver<GetUsersOfRoomsProcedure> procedureObserver;
   private int previousSyncState;
 
+  private CompositeDisposable compositeDisposable = new CompositeDisposable();
+
   public UsersOfRoomDialogFragment() {
   }
 
@@ -76,9 +88,32 @@ public class UsersOfRoomDialogFragment extends AbstractChatRoomDialogFragment {
 
   @Override
   protected void onSetupDialog() {
+    AbsoluteUrlHelper absoluteUrlHelper = new AbsoluteUrlHelper(
+        hostname,
+        new RealmServerInfoRepository(),
+        new RealmUserRepository(hostname),
+        new SessionInteractor(new RealmSessionRepository(hostname))
+    );
+
+    compositeDisposable.add(
+        absoluteUrlHelper.getRocketChatAbsoluteUrl()
+            .subscribeOn(AndroidSchedulers.from(BackgroundLooper.get()))
+            .observeOn(AndroidSchedulers.mainThread())
+            .subscribe(this::setupView)
+    );
+  }
+
+  private void setupView(Optional<RocketChatAbsoluteUrl> rocketChatAbsoluteUrlOptional) {
+    compositeDisposable.clear();
+
+    if (!rocketChatAbsoluteUrlOptional.isPresent()) {
+      return;
+    }
+
     RecyclerView recyclerView = (RecyclerView) getDialog().findViewById(R.id.recyclerview);
     recyclerView.setLayoutManager(new GridLayoutManager(getContext(), 2));
-    recyclerView.setAdapter(new RoomUserAdapter(getContext(), realmHelper, hostname));
+    recyclerView.setAdapter(
+        new RoomUserAdapter(getContext(), realmHelper, rocketChatAbsoluteUrlOptional.get()));
   }
 
   private void requestGetUsersOfRoom() {

app/src/main/java/chat/rocket/android/fragment/sidebar/SidebarMainContract.java

@@ -3,6 +3,7 @@ package chat.rocket.android.fragment.sidebar;
 import android.support.annotation.NonNull;
 
 import java.util.List;
+import chat.rocket.android.fragment.chatroom.RocketChatAbsoluteUrl;
 import chat.rocket.android.shared.BaseContract;
 import chat.rocket.core.models.Room;
 import chat.rocket.core.models.User;
@@ -17,7 +18,7 @@ public interface SidebarMainContract {
 
     void showRoomList(@NonNull List<Room> roomList);
 
-    void showUser(User user);
+    void show(User user, RocketChatAbsoluteUrl absoluteUrl);
   }
 
   interface Presenter extends BaseContract.Presenter<View> {

app/src/main/java/chat/rocket/android/fragment/sidebar/SidebarMainFragment.java

@@ -20,8 +20,10 @@ import chat.rocket.android.R;
 import chat.rocket.android.RocketChatCache;
 import chat.rocket.android.api.MethodCallHelper;
 import chat.rocket.android.fragment.AbstractFragment;
+import chat.rocket.android.fragment.chatroom.RocketChatAbsoluteUrl;
 import chat.rocket.android.fragment.sidebar.dialog.AddChannelDialogFragment;
 import chat.rocket.android.fragment.sidebar.dialog.AddDirectMessageDialogFragment;
+import chat.rocket.android.helper.AbsoluteUrlHelper;
 import chat.rocket.android.helper.TextUtils;
 import chat.rocket.android.layouthelper.chatroom.roomlist.ChannelRoomListHeader;
 import chat.rocket.android.layouthelper.chatroom.roomlist.DirectMessageRoomListHeader;
@@ -29,10 +31,13 @@ import chat.rocket.android.layouthelper.chatroom.roomlist.RoomListAdapter;
 import chat.rocket.android.layouthelper.chatroom.roomlist.RoomListHeader;
 import chat.rocket.android.layouthelper.chatroom.roomlist.UnreadRoomListHeader;
 import chat.rocket.core.interactors.RoomInteractor;
+import chat.rocket.core.interactors.SessionInteractor;
 import chat.rocket.core.models.Room;
 import chat.rocket.core.models.User;
 import chat.rocket.android.renderer.UserRenderer;
 import chat.rocket.persistence.realm.repositories.RealmRoomRepository;
+import chat.rocket.persistence.realm.repositories.RealmServerInfoRepository;
+import chat.rocket.persistence.realm.repositories.RealmSessionRepository;
 import chat.rocket.persistence.realm.repositories.RealmUserRepository;
 import chat.rocket.android.widget.RocketChatAvatar;
 
@@ -69,11 +74,21 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
     Bundle args = getArguments();
     hostname = args == null ? null : args.getString(HOSTNAME);
 
+    RealmUserRepository userRepository = new RealmUserRepository(hostname);
+
+    AbsoluteUrlHelper absoluteUrlHelper = new AbsoluteUrlHelper(
+        hostname,
+        new RealmServerInfoRepository(),
+        userRepository,
+        new SessionInteractor(new RealmSessionRepository(hostname))
+    );
+
     presenter = new SidebarMainPresenter(
         hostname,
         new RoomInteractor(new RealmRoomRepository(hostname)),
-        new RealmUserRepository(hostname),
+        userRepository,
         new RocketChatCache(getContext()),
+        absoluteUrlHelper,
         TextUtils.isEmpty(hostname) ? null : new MethodCallHelper(getContext(), hostname)
     );
   }
@@ -144,10 +159,11 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
     });
   }
 
-  private void onRenderCurrentUser(User user) {
-    if (user != null && !TextUtils.isEmpty(hostname)) {
+  private void onRenderCurrentUser(User user, RocketChatAbsoluteUrl absoluteUrl) {
+    if (user != null && absoluteUrl != null) {
       new UserRenderer(getContext(), user)
-          .avatarInto((RocketChatAvatar) rootView.findViewById(R.id.current_user_avatar), hostname)
+          .avatarInto((RocketChatAvatar) rootView.findViewById(R.id.current_user_avatar),
+              absoluteUrl)
           .usernameInto((TextView) rootView.findViewById(R.id.current_user_name))
           .statusColorInto((ImageView) rootView.findViewById(R.id.current_user_status));
     }
@@ -215,8 +231,8 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
   }
 
   @Override
-  public void showUser(User user) {
-    onRenderCurrentUser(user);
+  public void show(User user, RocketChatAbsoluteUrl absoluteUrl) {
+    onRenderCurrentUser(user, absoluteUrl);
     updateRoomListMode(user);
   }
 }

app/src/main/java/chat/rocket/android/fragment/sidebar/SidebarMainPresenter.java

 package chat.rocket.android.fragment.sidebar;
 
 import android.support.annotation.NonNull;
+import android.support.v4.util.Pair;
 
+import com.fernandocejas.arrow.optional.Optional;
+import io.reactivex.Flowable;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.Disposable;
 
 import chat.rocket.android.BackgroundLooper;
 import chat.rocket.android.RocketChatCache;
 import chat.rocket.android.api.MethodCallHelper;
+import chat.rocket.android.helper.AbsoluteUrlHelper;
 import chat.rocket.android.helper.LogIfError;
 import chat.rocket.android.helper.TextUtils;
 import chat.rocket.android.shared.BasePresenter;
@@ -23,15 +27,19 @@ public class SidebarMainPresenter extends BasePresenter<SidebarMainContract.View
   private final RoomInteractor roomInteractor;
   private final UserRepository userRepository;
   private final RocketChatCache rocketChatCache;
+  private final AbsoluteUrlHelper absoluteUrlHelper;
   private final MethodCallHelper methodCallHelper;
 
   public SidebarMainPresenter(String hostname, RoomInteractor roomInteractor,
-                              UserRepository userRepository, RocketChatCache rocketChatCache,
+                              UserRepository userRepository,
+                              RocketChatCache rocketChatCache,
+                              AbsoluteUrlHelper absoluteUrlHelper,
                               MethodCallHelper methodCallHelper) {
     this.hostname = hostname;
     this.roomInteractor = roomInteractor;
     this.userRepository = userRepository;
     this.rocketChatCache = rocketChatCache;
+    this.absoluteUrlHelper = absoluteUrlHelper;
     this.methodCallHelper = methodCallHelper;
   }
 
@@ -47,7 +55,17 @@ public class SidebarMainPresenter extends BasePresenter<SidebarMainContract.View
     view.showScreen();
 
     subscribeToRooms();
-    subscribeToUser();
+
+    final Disposable subscription = Flowable.combineLatest(
+        userRepository.getCurrent().distinctUntilChanged(),
+        absoluteUrlHelper.getRocketChatAbsoluteUrl().toFlowable(),
+        Pair::new
+    )
+        .subscribeOn(AndroidSchedulers.from(BackgroundLooper.get()))
+        .observeOn(AndroidSchedulers.mainThread())
+        .subscribe(pair -> view.show(pair.first.orNull(), pair.second.orNull()));
+
+    addSubscription(subscription);
   }
 
   @Override
@@ -94,16 +112,6 @@ public class SidebarMainPresenter extends BasePresenter<SidebarMainContract.View
     addSubscription(subscription);
   }
 
-  private void subscribeToUser() {
-    final Disposable subscription = userRepository.getCurrent()
-        .distinctUntilChanged()
-        .subscribeOn(AndroidSchedulers.from(BackgroundLooper.get()))
-        .observeOn(AndroidSchedulers.mainThread())
-        .subscribe(userOptional -> view.showUser(userOptional.orNull()));
-
-    addSubscription(subscription);
-  }
-
   private void updateCurrentUserStatus(String status) {
     if (methodCallHelper != null) {
       methodCallHelper.setUserStatus(status).continueWith(new LogIfError());

app/src/main/java/chat/rocket/android/fragment/sidebar/dialog/AddDirectMessageDialogFragment.java

@@ -4,15 +4,25 @@ import android.os.Bundle;
 import android.view.View;
 import android.widget.AutoCompleteTextView;
 import android.widget.TextView;
+import com.fernandocejas.arrow.optional.Optional;
 import com.jakewharton.rxbinding2.widget.RxTextView;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.CompositeDisposable;
 import io.realm.Case;
 
 import bolts.Task;
+import chat.rocket.android.BackgroundLooper;
 import chat.rocket.android.R;
+import chat.rocket.android.fragment.chatroom.RocketChatAbsoluteUrl;
+import chat.rocket.android.helper.AbsoluteUrlHelper;
 import chat.rocket.android.helper.TextUtils;
 import chat.rocket.android.layouthelper.sidebar.dialog.SuggestUserAdapter;
+import chat.rocket.core.interactors.SessionInteractor;
 import chat.rocket.persistence.realm.models.ddp.RealmUser;
 import chat.rocket.persistence.realm.RealmAutoCompleteAdapter;
+import chat.rocket.persistence.realm.repositories.RealmServerInfoRepository;
+import chat.rocket.persistence.realm.repositories.RealmSessionRepository;
+import chat.rocket.persistence.realm.repositories.RealmUserRepository;
 
 /**
  * add Direct RealmMessage.
@@ -27,6 +37,8 @@ public class AddDirectMessageDialogFragment extends AbstractAddRoomDialogFragmen
     return fragment;
   }
 
+  private CompositeDisposable compositeDisposable = new CompositeDisposable();
+
   @Override
   protected int getLayout() {
     return R.layout.dialog_add_direct_message;
@@ -38,13 +50,19 @@ public class AddDirectMessageDialogFragment extends AbstractAddRoomDialogFragmen
     AutoCompleteTextView autoCompleteTextView =
         (AutoCompleteTextView) getDialog().findViewById(R.id.editor_username);
 
-    RealmAutoCompleteAdapter<RealmUser> adapter =
-        realmHelper.createAutoCompleteAdapter(getContext(),
-            (realm, text) -> realm.where(RealmUser.class)
-                .contains(RealmUser.USERNAME, text, Case.INSENSITIVE)
-                .findAllSorted(RealmUser.USERNAME),
-            context -> new SuggestUserAdapter(context, hostname));
-    autoCompleteTextView.setAdapter(adapter);
+    AbsoluteUrlHelper absoluteUrlHelper = new AbsoluteUrlHelper(
+        hostname,
+        new RealmServerInfoRepository(),
+        new RealmUserRepository(hostname),
+        new SessionInteractor(new RealmSessionRepository(hostname))
+    );
+
+    compositeDisposable.add(
+        absoluteUrlHelper.getRocketChatAbsoluteUrl()
+            .subscribeOn(AndroidSchedulers.from(BackgroundLooper.get()))
+            .observeOn(AndroidSchedulers.mainThread())
+            .subscribe(this::setupView)
+    );
 
     RxTextView.textChanges(autoCompleteTextView)
         .map(text -> !TextUtils.isEmpty(text))
@@ -54,6 +72,25 @@ public class AddDirectMessageDialogFragment extends AbstractAddRoomDialogFragmen
     buttonAddDirectMessage.setOnClickListener(view -> createRoom());
   }
 
+  private void setupView(Optional<RocketChatAbsoluteUrl> rocketChatAbsoluteUrlOptional) {
+    compositeDisposable.clear();
+
+    if (!rocketChatAbsoluteUrlOptional.isPresent()) {
+      return;
+    }
+
+    AutoCompleteTextView autoCompleteTextView =
+        (AutoCompleteTextView) getDialog().findViewById(R.id.editor_username);
+
+    RealmAutoCompleteAdapter<RealmUser> adapter =
+        realmHelper.createAutoCompleteAdapter(getContext(),
+            (realm, text) -> realm.where(RealmUser.class)
+                .contains(RealmUser.USERNAME, text, Case.INSENSITIVE)
+                .findAllSorted(RealmUser.USERNAME),
+            context -> new SuggestUserAdapter(context, rocketChatAbsoluteUrlOptional.get()));
+    autoCompleteTextView.setAdapter(adapter);
+  }
+
   @Override
   protected Task<Void> getMethodCallForSubmitAction() {
     String username =

app/src/main/java/chat/rocket/android/helper/AbsoluteUrlHelper.java

+package chat.rocket.android.helper;
+
+import com.fernandocejas.arrow.optional.Optional;
+import io.reactivex.Flowable;
+import io.reactivex.Single;
+
+import chat.rocket.android.fragment.chatroom.RocketChatAbsoluteUrl;
+import chat.rocket.core.interactors.SessionInteractor;
+import chat.rocket.core.repositories.ServerInfoRepository;
+import chat.rocket.core.repositories.UserRepository;
+
+public class AbsoluteUrlHelper {
+
+  private final String hostname;
+  private final ServerInfoRepository serverInfoRepository;
+  private final UserRepository userRepository;
+  private final SessionInteractor sessionInteractor;
+
+  public AbsoluteUrlHelper(String hostname,
+                           ServerInfoRepository serverInfoRepository,
+                           UserRepository userRepository,
+                           SessionInteractor sessionInteractor) {
+    this.hostname = hostname;
+    this.serverInfoRepository = serverInfoRepository;
+    this.userRepository = userRepository;
+    this.sessionInteractor = sessionInteractor;
+  }
+
+  public Single<Optional<RocketChatAbsoluteUrl>> getRocketChatAbsoluteUrl() {
+    return Flowable.zip(
+        serverInfoRepository.getByHostname(hostname)
+            .filter(Optional::isPresent)
+            .map(Optional::get),
+        userRepository.getCurrent()
+            .filter(Optional::isPresent)
+            .map(Optional::get),
+        sessionInteractor.getDefault()
+            .filter(Optional::isPresent)
+            .map(Optional::get),
+        (info, user, session) -> Optional.of(new RocketChatAbsoluteUrl(
+            info, user,
+            session
+        ))
+    )
+        .first(Optional.absent());
+  }
+}

app/src/main/java/chat/rocket/android/helper/Avatar.java

@@ -11,6 +11,7 @@ import com.amulyakhare.textdrawable.TextDrawable;
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
 import chat.rocket.android.log.RCLog;
+import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.android.widget.RocketChatAvatar;
 
 /**
@@ -22,11 +23,11 @@ public class Avatar {
       0xFF03A9F4, 0xFF00BCD4, 0xFF009688, 0xFF4CAF50, 0xFF8BC34A, 0xFFCDDC39,
       0xFFFFC107, 0xFFFF9800, 0xFFFF5722, 0xFF795548, 0xFF9E9E9E, 0xFF607D8B
   };
-  private final String hostname;
+  private final AbsoluteUrl absoluteUrl;
   private final String username;
 
-  public Avatar(String hostname, String username) {
-    this.hostname = hostname;
+  public Avatar(AbsoluteUrl absoluteUrl, String username) {
+    this.absoluteUrl = absoluteUrl;
     this.username = username;
   }
 
@@ -71,7 +72,7 @@ public class Avatar {
     //from Rocket.Chat:packages/rocketchat-ui/lib/avatar.coffee
     //REMARK! this is often SVG image! (see: Rocket.Chat:server/startup/avatar.coffee)
     try {
-      return "https://" + hostname + "/avatar/" + URLEncoder.encode(username, "UTF-8") + ".jpg";
+      return absoluteUrl.getAbsolute("/avatar/" + URLEncoder.encode(username, "UTF-8") + ".jpg");
     } catch (UnsupportedEncodingException exception) {
       RCLog.e(exception, "failed to get URL for user: %s", username);
       return null;

app/src/main/java/chat/rocket/android/layouthelper/chatroom/AbstractMessageViewHolder.java

@@ -7,6 +7,7 @@ import android.widget.TextView;
 import chat.rocket.android.R;
 import chat.rocket.android.helper.DateTime;
 import chat.rocket.android.helper.TextUtils;
+import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.core.SyncState;
 import chat.rocket.android.widget.RocketChatAvatar;
 
@@ -16,14 +17,14 @@ public abstract class AbstractMessageViewHolder extends ModelViewHolder<PairedMe
   protected final TextView subUsername;
   protected final TextView timestamp;
   protected final View userAndTimeContainer;
-  protected final String hostname;
+  protected final AbsoluteUrl absoluteUrl;
   protected final View newDayContainer;
   protected final TextView newDayText;
 
   /**
    * constructor WITH hostname.
    */
-  public AbstractMessageViewHolder(View itemView, String hostname) {
+  public AbstractMessageViewHolder(View itemView, AbsoluteUrl absoluteUrl) {
     super(itemView);
     avatar = (RocketChatAvatar) itemView.findViewById(R.id.user_avatar);
     username = (TextView) itemView.findViewById(R.id.username);
@@ -32,7 +33,7 @@ public abstract class AbstractMessageViewHolder extends ModelViewHolder<PairedMe
     userAndTimeContainer = itemView.findViewById(R.id.user_and_timestamp_container);
     newDayContainer = itemView.findViewById(R.id.newday_container);
     newDayText = (TextView) itemView.findViewById(R.id.newday_text);
-    this.hostname = hostname;
+    this.absoluteUrl = absoluteUrl;
   }
 
   /**

app/src/main/java/chat/rocket/android/layouthelper/chatroom/MessageListAdapter.java

@@ -10,6 +10,7 @@ import java.util.List;
 import chat.rocket.android.R;
 import chat.rocket.android.helper.TextUtils;
 import chat.rocket.android.layouthelper.ExtModelListAdapter;
+import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.core.models.Message;
 
 /**
@@ -22,15 +23,19 @@ public class MessageListAdapter
   private static final int VIEW_TYPE_NORMAL_MESSAGE = 1;
   private static final int VIEW_TYPE_SYSTEM_MESSAGE = 2;
 
-  private final String hostname;
+  private AbsoluteUrl absoluteUrl;
 
   private boolean autoloadImages = false;
   private boolean hasNext;
   private boolean isLoaded;
 
-  public MessageListAdapter(Context context, String hostname) {
+  public MessageListAdapter(Context context) {
     super(context);
-    this.hostname = hostname;
+  }
+
+  public void setAbsoluteUrl(AbsoluteUrl absoluteUrl) {
+    this.absoluteUrl = absoluteUrl;
+    notifyDataSetChanged();
   }
 
   public void setAutoloadImages(boolean autoloadImages) {
@@ -88,11 +93,11 @@ public class MessageListAdapter
   protected AbstractMessageViewHolder onCreateRealmModelViewHolder(int viewType, View itemView) {
     switch (viewType) {
       case VIEW_TYPE_NORMAL_MESSAGE:
-        return new MessageNormalViewHolder(itemView, hostname);
+        return new MessageNormalViewHolder(itemView, absoluteUrl);
       case VIEW_TYPE_SYSTEM_MESSAGE:
-        return new MessageSystemViewHolder(itemView, hostname);
+        return new MessageSystemViewHolder(itemView, absoluteUrl);
       default:
-        return new AbstractMessageViewHolder(itemView, hostname) {
+        return new AbstractMessageViewHolder(itemView, absoluteUrl) {
           @Override
           protected void bindMessage(PairedMessage pairedMessage, boolean autoloadImages) {
           }

app/src/main/java/chat/rocket/android/layouthelper/chatroom/MessageNormalViewHolder.java

@@ -4,6 +4,7 @@ import android.view.View;
 
 import chat.rocket.android.R;
 import chat.rocket.android.renderer.MessageRenderer;
+import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.android.widget.message.RocketChatMessageAttachmentsLayout;
 import chat.rocket.android.widget.message.RocketChatMessageLayout;
 import chat.rocket.android.widget.message.RocketChatMessageUrlsLayout;
@@ -19,8 +20,8 @@ public class MessageNormalViewHolder extends AbstractMessageViewHolder {
   /**
    * constructor WITH hostname.
    */
-  public MessageNormalViewHolder(View itemView, String hostname) {
-    super(itemView, hostname);
+  public MessageNormalViewHolder(View itemView, AbsoluteUrl absoluteUrl) {
+    super(itemView, absoluteUrl);
     body = (RocketChatMessageLayout) itemView.findViewById(R.id.message_body);
     urls = (RocketChatMessageUrlsLayout) itemView.findViewById(R.id.message_urls);
     attachments =
@@ -30,11 +31,11 @@ public class MessageNormalViewHolder extends AbstractMessageViewHolder {
   @Override
   protected void bindMessage(PairedMessage pairedMessage, boolean autoloadImages) {
     new MessageRenderer(itemView.getContext(), pairedMessage.target, autoloadImages)
-        .avatarInto(avatar, hostname)
+        .avatarInto(avatar, absoluteUrl)
         .usernameInto(username, subUsername)
         .timestampInto(timestamp)
         .bodyInto(body)
         .urlsInto(urls)
-        .attachmentsInto(attachments, hostname);
+        .attachmentsInto(attachments, absoluteUrl);
   }
 }

app/src/main/java/chat/rocket/android/layouthelper/chatroom/MessageSystemViewHolder.java

@@ -5,6 +5,7 @@ import android.widget.TextView;
 
 import chat.rocket.android.R;
 import chat.rocket.android.renderer.MessageRenderer;
+import chat.rocket.android.widget.AbsoluteUrl;
 
 /**
  * ViewData holder of NORMAL chat message.
@@ -15,15 +16,15 @@ public class MessageSystemViewHolder extends AbstractMessageViewHolder {
   /**
    * constructor WITH hostname.
    */
-  public MessageSystemViewHolder(View itemView, String hostname) {
-    super(itemView, hostname);
+  public MessageSystemViewHolder(View itemView, AbsoluteUrl absoluteUrl) {
+    super(itemView, absoluteUrl);
     body = (TextView) itemView.findViewById(R.id.message_body);
   }
 
   @Override
   protected void bindMessage(PairedMessage pairedMessage, boolean autoloadImages) {
     new MessageRenderer(itemView.getContext(), pairedMessage.target, autoloadImages)
-        .avatarInto(avatar, hostname)
+        .avatarInto(avatar, absoluteUrl)
         .usernameInto(username, subUsername)
         .timestampInto(timestamp);
 

app/src/main/java/chat/rocket/android/layouthelper/chatroom/dialog/RoomUserAdapter.java

@@ -9,6 +9,7 @@ import android.view.ViewGroup;
 import java.util.List;
 import chat.rocket.android.R;
 import chat.rocket.android.helper.TextUtils;
+import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.core.models.User;
 import chat.rocket.persistence.realm.models.ddp.RealmUser;
 import chat.rocket.persistence.realm.RealmHelper;
@@ -22,17 +23,17 @@ public class RoomUserAdapter extends RecyclerView.Adapter<RoomUserViewHolder> {
   private final Context context;
   private final LayoutInflater inflater;
   private final RealmHelper realmHelper;
-  private final String hostname;
+  private final AbsoluteUrl absoluteUrl;
   private List<String> usernames;
 
   /**
    * Constructor with required parameters.
    */
-  public RoomUserAdapter(Context context, RealmHelper realmHelper, String hostname) {
+  public RoomUserAdapter(Context context, RealmHelper realmHelper, AbsoluteUrl absoluteUrl) {
     this.context = context;
     this.inflater = LayoutInflater.from(context);
     this.realmHelper = realmHelper;
-    this.hostname = hostname;
+    this.absoluteUrl = absoluteUrl;
   }
 
   @Override
@@ -57,12 +58,12 @@ public class RoomUserAdapter extends RecyclerView.Adapter<RoomUserViewHolder> {
           .setUtcOffset(0)
           .build();
       new UserRenderer(context, user)
-          .avatarInto(holder.avatar, hostname)
+          .avatarInto(holder.avatar, absoluteUrl)
           .usernameInto(holder.username);
     } else {
       new UserRenderer(context, realmUser.asUser())
           .statusColorInto(holder.status)
-          .avatarInto(holder.avatar, hostname)
+          .avatarInto(holder.avatar, absoluteUrl)
           .usernameInto(holder.username);
     }
   }

app/src/main/java/chat/rocket/android/layouthelper/sidebar/dialog/SuggestUserAdapter.java

@@ -7,6 +7,7 @@ import android.widget.ImageView;
 import java.util.Iterator;
 import java.util.List;
 import chat.rocket.android.R;
+import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.persistence.realm.models.ddp.RealmUser;
 import chat.rocket.persistence.realm.RealmAutoCompleteAdapter;
 import chat.rocket.android.renderer.UserRenderer;
@@ -16,18 +17,18 @@ import chat.rocket.android.widget.RocketChatAvatar;
  * adapter to suggest user names.
  */
 public class SuggestUserAdapter extends RealmAutoCompleteAdapter<RealmUser> {
-  private final String hostname;
+  private final AbsoluteUrl absoluteUrl;
 
-  public SuggestUserAdapter(Context context, String hostname) {
+  public SuggestUserAdapter(Context context, AbsoluteUrl absoluteUrl) {
     super(context, R.layout.listitem_room_user, R.id.room_user_name);
-    this.hostname = hostname;
+    this.absoluteUrl = absoluteUrl;
   }
 
   @Override
   protected void onBindItemView(View itemView, RealmUser user) {
     new UserRenderer(itemView.getContext(), user.asUser())
         .statusColorInto((ImageView) itemView.findViewById(R.id.room_user_status))
-        .avatarInto((RocketChatAvatar) itemView.findViewById(R.id.room_user_avatar), hostname);
+        .avatarInto((RocketChatAvatar) itemView.findViewById(R.id.room_user_avatar), absoluteUrl);
   }
 
   @Override

app/src/main/java/chat/rocket/android/renderer/MessageRenderer.java

@@ -10,6 +10,7 @@ import chat.rocket.android.R;
 import chat.rocket.android.helper.Avatar;
 import chat.rocket.android.helper.DateTime;
 import chat.rocket.android.helper.TextUtils;
+import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.core.SyncState;
 import chat.rocket.core.models.Attachment;
 import chat.rocket.core.models.Message;
@@ -37,15 +38,15 @@ public class MessageRenderer extends AbstractRenderer<Message> {
   /**
    * show Avatar image.
    */
-  public MessageRenderer avatarInto(RocketChatAvatar rocketChatAvatar, String hostname) {
+  public MessageRenderer avatarInto(RocketChatAvatar rocketChatAvatar, AbsoluteUrl absoluteUrl) {
     if (object.getSyncState() == SyncState.FAILED) {
       rocketChatAvatar.loadImage(VectorDrawableCompat
           .create(context.getResources(), R.drawable.ic_error_outline_black_24dp, null));
     } else if (TextUtils.isEmpty(object.getAvatar())) {
-      userRenderer.avatarInto(rocketChatAvatar, hostname);
+      userRenderer.avatarInto(rocketChatAvatar, absoluteUrl);
     } else {
       final User user = object.getUser();
-      setAvatarInto(object.getAvatar(), hostname, user == null ? null : user.getUsername(),
+      setAvatarInto(object.getAvatar(), absoluteUrl, user == null ? null : user.getUsername(),
           rocketChatAvatar);
     }
     return this;
@@ -123,7 +124,7 @@ public class MessageRenderer extends AbstractRenderer<Message> {
    * show urls in RocketChatMessageUrlsLayout.
    */
   public MessageRenderer attachmentsInto(RocketChatMessageAttachmentsLayout attachmentsLayout,
-                                         String hostname) {
+                                         AbsoluteUrl absoluteUrl) {
     if (!shouldHandle(attachmentsLayout)) {
       return this;
     }
@@ -133,16 +134,16 @@ public class MessageRenderer extends AbstractRenderer<Message> {
       attachmentsLayout.setVisibility(View.GONE);
     } else {
       attachmentsLayout.setVisibility(View.VISIBLE);
-      attachmentsLayout.setHostname(hostname);
+      attachmentsLayout.setAbsoluteUrl(absoluteUrl);
       attachmentsLayout.setAttachments(attachments, autoloadImages);
     }
 
     return this;
   }
 
-  private void setAvatarInto(String avatar, String hostname, String username,
+  private void setAvatarInto(String avatar, AbsoluteUrl absoluteUrl, String username,
                              RocketChatAvatar imageView) {
-    imageView.loadImage(avatar, new Avatar(hostname, username).getTextDrawable(context));
+    imageView.loadImage(avatar, new Avatar(absoluteUrl, username).getTextDrawable(context));
   }
 
   private void aliasAndUsernameInto(TextView aliasTextView, TextView usernameTextView) {

app/src/main/java/chat/rocket/android/renderer/UserRenderer.java

@@ -7,6 +7,7 @@ import android.widget.TextView;
 import chat.rocket.android.R;
 import chat.rocket.android.helper.Avatar;
 import chat.rocket.android.helper.TextUtils;
+import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.core.models.User;
 import chat.rocket.android.widget.RocketChatAvatar;
 
@@ -22,13 +23,13 @@ public class UserRenderer extends AbstractRenderer<User> {
   /**
    * show Avatar image
    */
-  public UserRenderer avatarInto(RocketChatAvatar rocketChatAvatar, String hostname) {
+  public UserRenderer avatarInto(RocketChatAvatar rocketChatAvatar, AbsoluteUrl absoluteUrl) {
     if (!shouldHandle(rocketChatAvatar)) {
       return this;
     }
 
     if (!TextUtils.isEmpty(object.getUsername())) {
-      new Avatar(hostname, object.getUsername()).into(rocketChatAvatar);
+      new Avatar(absoluteUrl, object.getUsername()).into(rocketChatAvatar);
     }
     return this;
   }

persistence-realm/src/main/java/chat/rocket/persistence/realm/models/RealmBasedServerInfo.java

@@ -2,6 +2,7 @@ package chat.rocket.persistence.realm.models;
 
 import android.support.annotation.Nullable;
 import android.text.TextUtils;
+import io.realm.Realm;
 import io.realm.RealmObject;
 import io.realm.annotations.PrimaryKey;
 
@@ -24,14 +25,14 @@ public class RealmBasedServerInfo extends RealmObject {
   private String session;
   private boolean insecure;
 
-  interface ColumnName {
+  public interface ColumnName {
     String HOSTNAME = "hostname";
     String NAME = "name";
     String SESSION = "session";
     String INSECURE = "insecure";
   }
 
-  ServerInfo getServerInfo() {
+  public ServerInfo getServerInfo() {
     return ServerInfo.builder()
         .setHostname(hostname)
         .setName(name)
@@ -40,12 +41,16 @@ public class RealmBasedServerInfo extends RealmObject {
         .build();
   }
 
-  public static RealmHelper getRealm() {
+  public static Realm getRealm() {
+    return RealmStore.getRealm(DB_NAME);
+  }
+
+  public static RealmHelper getRealmHelper() {
     return RealmStore.getOrCreateForServerScope(DB_NAME);
   }
 
   public static void addOrUpdate(String hostname, String name, boolean insecure) {
-    getRealm().executeTransaction(realm ->
+    getRealmHelper().executeTransaction(realm ->
         realm.createOrUpdateObjectFromJson(RealmBasedServerInfo.class, new JSONObject()
             .put(ColumnName.HOSTNAME, hostname)
             .put(ColumnName.NAME, TextUtils.isEmpty(name) ? JSONObject.NULL : name)
@@ -53,7 +58,7 @@ public class RealmBasedServerInfo extends RealmObject {
   }
 
   public static void remove(String hostname) {
-    getRealm().executeTransaction(realm -> {
+    getRealmHelper().executeTransaction(realm -> {
       realm.where(RealmBasedServerInfo.class).equalTo(ColumnName.HOSTNAME, hostname)
           .findAll()
           .deleteAllFromRealm();
@@ -62,12 +67,12 @@ public class RealmBasedServerInfo extends RealmObject {
   }
 
   public static void updateSession(String hostname, String session) {
-    RealmBasedServerInfo impl = getRealm().executeTransactionForRead(realm ->
+    RealmBasedServerInfo impl = getRealmHelper().executeTransactionForRead(realm ->
         realm.where(RealmBasedServerInfo.class).equalTo(ColumnName.HOSTNAME, hostname).findFirst());
 
     if (impl != null) {
       impl.session = session;
-      getRealm().executeTransaction(realm -> {
+      getRealmHelper().executeTransaction(realm -> {
         realm.copyToRealmOrUpdate(impl);
         return null;
       });
@@ -76,13 +81,13 @@ public class RealmBasedServerInfo extends RealmObject {
 
   @Nullable
   public static ServerInfo getServerInfoForHost(String hostname) {
-    RealmBasedServerInfo impl = getRealm().executeTransactionForRead(realm ->
+    RealmBasedServerInfo impl = getRealmHelper().executeTransactionForRead(realm ->
         realm.where(RealmBasedServerInfo.class).equalTo(ColumnName.HOSTNAME, hostname).findFirst());
     return impl == null ? null : impl.getServerInfo();
   }
 
   public static List<ServerInfo> getServerInfoList() {
-    List<RealmBasedServerInfo> results = getRealm().executeTransactionForReadResults(realm ->
+    List<RealmBasedServerInfo> results = getRealmHelper().executeTransactionForReadResults(realm ->
         realm.where(RealmBasedServerInfo.class).findAll());
     ArrayList<ServerInfo> list = new ArrayList<>();
     for (RealmBasedServerInfo impl : results) {

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmServerInfoRepository.java

+package chat.rocket.persistence.realm.repositories;
+
+import android.os.Looper;
+import android.support.v4.util.Pair;
+import com.fernandocejas.arrow.optional.Optional;
+import io.reactivex.Flowable;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+
+import chat.rocket.core.models.ServerInfo;
+import chat.rocket.core.repositories.ServerInfoRepository;
+import chat.rocket.persistence.realm.models.RealmBasedServerInfo;
+import hu.akarnokd.rxjava.interop.RxJavaInterop;
+
+public class RealmServerInfoRepository extends RealmRepository implements ServerInfoRepository {
+
+  @Override
+  public Flowable<Optional<ServerInfo>> getByHostname(String hostname) {
+    return Flowable.defer(() -> Flowable.using(
+        () -> new Pair<>(RealmBasedServerInfo.getRealm(), Looper.myLooper()),
+        pair -> {
+          RealmBasedServerInfo info = pair.first.where(RealmBasedServerInfo.class)
+              .equalTo(RealmBasedServerInfo.ColumnName.HOSTNAME, hostname)
+              .findFirst();
+
+          if (info == null) {
+            return Flowable.just(Optional.<RealmBasedServerInfo>absent());
+          }
+
+          return RxJavaInterop.toV2Flowable(info
+              .<RealmBasedServerInfo>asObservable()
+              .filter(it -> it.isLoaded() && it.isValid())
+              .map(Optional::of));
+        },
+        pair -> close(pair.first, pair.second)
+    )
+        .unsubscribeOn(AndroidSchedulers.from(Looper.myLooper()))
+        .map(optional -> {
+          if (optional.isPresent()) {
+            return Optional.of(optional.get().getServerInfo());
+          }
+
+          return Optional.absent();
+        }));
+  }
+}

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/AbsoluteUrl.java

+package chat.rocket.android.widget;
+
+public interface AbsoluteUrl {
+
+  String getAbsolute(String url);
+}

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/message/RocketChatMessageAttachmentsLayout.java

@@ -17,6 +17,7 @@ import android.widget.TextView;
 import com.facebook.drawee.view.SimpleDraweeView;
 
 import java.util.List;
+import chat.rocket.android.widget.AbsoluteUrl;
 import chat.rocket.android.widget.R;
 import chat.rocket.android.widget.helper.FrescoHelper;
 import chat.rocket.core.models.Attachment;
@@ -28,7 +29,7 @@ import chat.rocket.core.models.AttachmentTitle;
  */
 public class RocketChatMessageAttachmentsLayout extends LinearLayout {
   private LayoutInflater inflater;
-  private String hostname;
+  private AbsoluteUrl absoluteUrl;
   private List<Attachment> attachments;
 
   public RocketChatMessageAttachmentsLayout(Context context) {
@@ -58,8 +59,8 @@ public class RocketChatMessageAttachmentsLayout extends LinearLayout {
     setOrientation(VERTICAL);
   }
 
-  public void setHostname(String hostname) {
-    this.hostname = hostname;
+  public void setAbsoluteUrl(AbsoluteUrl absoluteUrl) {
+    this.absoluteUrl = absoluteUrl;
   }
 
   public void setAttachments(List<Attachment> attachments, boolean autoloadImages) {
@@ -238,7 +239,7 @@ public class RocketChatMessageAttachmentsLayout extends LinearLayout {
   }
 
   private String absolutize(String url) {
-    return url.startsWith("/") ? "https://" + hostname + url : url;
+    return absoluteUrl.getAbsolute(url);
   }
 
   private void loadImage(final String url, final SimpleDraweeView drawee, final View load,

rocket-chat-core/src/main/java/chat/rocket/core/models/LoginServiceConfiguration.java

@@ -2,6 +2,8 @@ package chat.rocket.core.models;
 
 import com.google.auto.value.AutoValue;
 
+import javax.annotation.Nullable;
+
 @AutoValue
 public abstract class LoginServiceConfiguration {
 
@@ -9,6 +11,7 @@ public abstract class LoginServiceConfiguration {
 
   public abstract String getService();
 
+  @Nullable
   public abstract String getKey();
 
   public static Builder builder() {

rocket-chat-core/src/main/java/chat/rocket/core/repositories/ServerInfoRepository.java

+package chat.rocket.core.repositories;
+
+import com.fernandocejas.arrow.optional.Optional;
+
+import io.reactivex.Flowable;
+
+import chat.rocket.core.models.ServerInfo;
+
+public interface ServerInfoRepository {
+
+  Flowable<Optional<ServerInfo>> getByHostname(String hostname);
+}