Create AccountManager to encapsulate authentication and account logic

bramble-api/src/main/java/org/briarproject/bramble/api/account/AccountManager.java

@@ -0,0 +1,39 @@
+package org.briarproject.bramble.api.account;
+
+import org.briarproject.bramble.api.crypto.CryptoExecutor;
+import org.briarproject.bramble.api.identity.IdentityManager;
+import org.briarproject.bramble.api.identity.LocalAuthor;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.Nullable;
+
+@NotNullByDefault
+public interface AccountManager {
+
+	@CryptoExecutor
+	void createAccount(String name, String password);
+
+	AccountState getAccountState();
+
+	/**
+	 * Returns the name of the {@link LocalAuthor} if it was just created and
+	 * null otherwise.
+	 *
+	 * See {@link IdentityManager#getLocalAuthor()} for reliable retrieval.
+	 */
+	@Nullable
+	String getCreatedLocalAuthorName();
+
+	/**
+	 * Validates the account password and returns true if it was valid.
+	 */
+	boolean validatePassword(String password);
+
+	/**
+	 * Changes the password and returns true if successful, false otherwise.
+	 */
+	@CryptoExecutor
+	boolean changePassword(String password, String newPassword);
+
+	void deleteAccount();
+}

bramble-api/src/main/java/org/briarproject/bramble/api/account/AccountState.java

@@ -0,0 +1,12 @@
+package org.briarproject.bramble.api.account;
+
+public enum AccountState {
+
+	NO_ACCOUNT,
+	CREATING_ACCOUNT,
+	SIGNING_IN,
+	SIGNED_IN,
+	SIGNING_OUT,
+	SIGNED_OUT
+
+}

bramble-api/src/main/java/org/briarproject/bramble/api/db/DatabaseConfig.java

@@ -21,10 +21,5 @@ public interface DatabaseConfig {
 	@Nullable
 	SecretKey getEncryptionKey();
 
-	void setLocalAuthorName(String nickname);
-
-	@Nullable
-	String getLocalAuthorName();
-
 	long getMaxSize();
 }