New user model

src/main/java/com/nextcloud/client/account/AnonymousUser.kt

@@ -0,0 +1,57 @@
+/*
+ * Nextcloud Android client application
+ *
+ * @author Chris Narkiewicz <hello@ezaquarii.com>
+ * Copyright (C) 2019 Chris Narkiewicz
+ * Copyright (C) 2019 Nextcloud GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.nextcloud.client.account
+
+import android.accounts.Account
+import android.content.Context
+import android.net.Uri
+import com.owncloud.android.MainApp
+import com.owncloud.android.R
+import com.owncloud.android.lib.common.OwnCloudAccount
+import com.owncloud.android.lib.common.OwnCloudBasicCredentials
+import java.net.URI
+
+/**
+ * This object represents anonymous user, ie. user that did not log in the Nextcloud server.
+ * It serves as a semantically correct "empty value", allowing simplification of logic
+ * in various components requiring user data, such as DB queries.
+ */
+internal class AnonymousUser(private val accountType: String) : User {
+
+    companion object {
+        @JvmStatic
+        fun fromContext(context: Context): AnonymousUser {
+            val type = context.getString(R.string.account_type)
+            return AnonymousUser(type)
+        }
+    }
+
+    override val accountName: String = "anonymous"
+    override val server = Server(URI.create(""), MainApp.MINIMUM_SUPPORTED_SERVER_VERSION)
+
+    override fun toPlatformAccount(): Account {
+        return Account(accountName, accountType)
+    }
+
+    override fun toOwnCloudAccount(): OwnCloudAccount {
+        return OwnCloudAccount(Uri.EMPTY, OwnCloudBasicCredentials("", ""))
+    }
+}

src/main/java/com/nextcloud/client/account/CurrentAccountProvider.java

@@ -2,19 +2,31 @@
 
 import android.accounts.Account;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 /**
- * This interface provides access to currently selected user Account.
+ * This interface provides access to currently selected user.
+ *
  * @see UserAccountManager
  */
-@FunctionalInterface
 public interface CurrentAccountProvider {
     /**
-     *  Get currently active account.
+     * Get currently active account.
      *
      * @return Currently selected {@link Account} or first valid {@link Account} registered in OS or null, if not available at all.
      */
+    @Deprecated
     @Nullable
     Account getCurrentAccount();
+
+    /**
+     * Get currently active user profile. If there is no actice user, anonymous user is returned.
+     *
+     * @return User profile. Profile is never null.
+     */
+    @NonNull
+    default User getUser() {
+        return new AnonymousUser("dummy");
+    }
 }

src/main/java/com/nextcloud/client/account/RegisteredUser.kt

@@ -0,0 +1,46 @@
+/*
+ * Nextcloud Android client application
+ *
+ * @author Chris Narkiewicz <hello@ezaquarii.com>
+ * Copyright (C) 2019 Chris Narkiewicz
+ * Copyright (C) 2019 Nextcloud GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.nextcloud.client.account
+
+import android.accounts.Account
+import com.owncloud.android.lib.common.OwnCloudAccount
+
+/**
+ * This class represents normal user logged into the Nextcloud server.
+ */
+internal class RegisteredUser(
+    private val account: Account,
+    private val ownCloudAccount: OwnCloudAccount,
+    override val server: Server
+) : User {
+
+    override val accountName: String get() {
+        return account.name
+    }
+
+    override fun toPlatformAccount(): Account {
+        return account
+    }
+
+    override fun toOwnCloudAccount(): OwnCloudAccount {
+        return ownCloudAccount
+    }
+}

src/main/java/com/nextcloud/client/account/Server.kt

@@ -0,0 +1,30 @@
+/*
+ * Nextcloud Android client application
+ *
+ * @author Chris Narkiewicz <hello@ezaquarii.com>
+ * Copyright (C) 2019 Chris Narkiewicz
+ * Copyright (C) 2019 Nextcloud GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.nextcloud.client.account
+
+import com.owncloud.android.lib.resources.status.OwnCloudVersion
+import java.net.URI
+
+/**
+ * This object provides all information necessary to interact
+ * with backend server.
+ */
+data class Server(val uri: URI, val version: OwnCloudVersion)

src/main/java/com/nextcloud/client/account/User.kt

@@ -0,0 +1,53 @@
+/*
+ * Nextcloud Android client application
+ *
+ * @author Chris Narkiewicz <hello@ezaquarii.com>
+ * Copyright (C) 2019 Chris Narkiewicz
+ * Copyright (C) 2019 Nextcloud GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.nextcloud.client.account
+
+import android.accounts.Account
+import com.owncloud.android.lib.common.OwnCloudAccount
+
+interface User {
+    val accountName: String
+    val server: Server
+
+    /**
+     * This is temporary helper method created to facilitate incremental refactoring.
+     * Code using legacy platform Account can be partially converted to instantiate User
+     * object and use account instance when required.
+     *
+     * This method calls will allow tracing code awaiting further refactoring.
+     *
+     * @return Account instance that is associated with this User object.
+     */
+    @Deprecated("Temporary workaround")
+    fun toPlatformAccount(): Account
+
+    /**
+     * This is temporary helper method created to facilitate incremental refactoring.
+     * Code using legacy ownCloud account can be partially converted to instantiate User
+     * object and use account instance when required.
+     *
+     * This method calls will allow tracing code awaiting further refactoring.
+     *
+     * @return OwnCloudAccount instance that is associated with this User object.
+     */
+    @Deprecated("Temporary workaround")
+    fun toOwnCloudAccount(): OwnCloudAccount
+}

src/main/java/com/nextcloud/client/account/UserAccountManager.java

@@ -21,10 +21,13 @@
 
 import android.accounts.Account;
 
+import com.nextcloud.java.util.Optional;
 import com.owncloud.android.datamodel.OCFile;
 import com.owncloud.android.lib.common.OwnCloudAccount;
 import com.owncloud.android.lib.resources.status.OwnCloudVersion;
 
+import java.util.List;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -51,6 +54,22 @@ public interface UserAccountManager extends CurrentAccountProvider {
     @NonNull
     Account[] getAccounts();
 
+    /**
+     * Get configured nextcloud user accounts
+     * @return List of users or empty list, if users are not registered.
+     */
+    @NonNull
+    List<User> getAllUsers();
+
+    /**
+     * Get user with a specific account name.
+     *
+     * @param accountName Account name of the requested user
+     * @return User or empty optional if user does not exist.
+     */
+    @NonNull
+    Optional<User> getUser(CharSequence accountName);
+
     /**
      * Check if Nextcloud account is registered in {@link android.accounts.AccountManager}
      *