Widen API to allow storing keychain entries for an authenticated user (#41)

Overlead and extend method storePassphrase() with requiresAuth flag

Author: purejava

src/main/java/org/cryptomator/integrations/keychain/KeychainAccessProvider.java

@@ -56,7 +56,24 @@ default void storePassphrase(String key, CharSequence passphrase) throws Keychai
 	 * @throws KeychainAccessException If storing the password failed
 	 */
 	@Blocking
-	void storePassphrase(String key, @Nullable String displayName, CharSequence passphrase) throws KeychainAccessException;
+	default void storePassphrase(String key, @Nullable String displayName, CharSequence passphrase) throws KeychainAccessException {
+		storePassphrase(key, displayName, passphrase, false);
+	}
+
+	/**
+	 * Associates a passphrase with a given key and a name for that key.
+	 *
+	 * @param key         Key used to retrieve the passphrase via {@link #loadPassphrase(String)}.
+	 * @param displayName The according name to the key. That's the name of the vault displayed in the UI.
+	 *                    It's passed to the keychain as an additional information about the vault besides the key.
+	 *                    The parameter does not need to be unique or be checked by the keychain.
+	 * @param passphrase  The secret to store in this keychain.
+	 * @param requireOsAuthentication Defines, whether the user needs to authenticate to store a passphrase.
+	 *                                The authentication mechanism is provided by the operating system dependent
+	 *                                implementations of this API.
+	 * @throws KeychainAccessException If storing the password failed
+	 */
+	void storePassphrase(String key, @Nullable String displayName, CharSequence passphrase, boolean requireOsAuthentication) throws KeychainAccessException;
 
 	/**
 	 * @param key Unique key previously used while {@link #storePassphrase(String, String, CharSequence)}  storing a passphrase}.