db/proxy: add "password" setting

Closes #283

NEWS

@@ -1,4 +1,6 @@
 ver 0.20.21 (not yet released)
+* database
+  - proxy: add "password" setting
 
 ver 0.20.20 (2018/05/22)
 * protocol

doc/user.xml

@@ -2114,6 +2114,15 @@ run</programlisting>
                   <application>MPD</application> instance.
                 </entry>
               </row>
+              <row>
+                <entry>
+                  <varname>password</varname>
+                </entry>
+                <entry>
+                  The password used to log in to the "master"
+                  <application>MPD</application> instance.
+                </entry>
+              </row>
               <row>
                 <entry>
                   <varname>keepalive</varname>

src/db/plugins/ProxyDatabasePlugin.cxx

@@ -82,6 +82,7 @@ class ProxyDatabase final : public Database, SocketMonitor, IdleMonitor {
 	DatabaseListener &listener;
 
 	const std::string host;
+	const std::string password;
 	const unsigned port;
 	const bool keepalive;
 
@@ -359,6 +360,7 @@ ProxyDatabase::ProxyDatabase(EventLoop &_loop, DatabaseListener &_listener,
 	 SocketMonitor(_loop), IdleMonitor(_loop),
 	 listener(_listener),
 	 host(block.GetBlockValue("host", "")),
+	 password(block.GetBlockValue("password", "")),
 	 port(block.GetBlockValue("port", 0u)),
 	 keepalive(block.GetBlockValue("keepalive", false))
 {
@@ -402,6 +404,10 @@ ProxyDatabase::Connect()
 
 	try {
 		CheckError(connection);
+
+		if (!password.empty() &&
+		    !mpd_run_password(connection, password.c_str()))
+			ThrowError(connection);
 	} catch (...) {
 		mpd_connection_free(connection);
 		connection = nullptr;