Properly handle Synapse as an Identity provider

src/main/java/io/kamax/mxisd/backend/sql/GenericSqlAuthProvider.java

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+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2017 Maxime Dor
+ *
+ * https://max.kamax.io/
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.backend.sql;
+
+import io.kamax.matrix._MatrixID;
+import io.kamax.mxisd.auth.provider.AuthenticatorProvider;
+import io.kamax.mxisd.auth.provider.BackendAuthResult;
+import io.kamax.mxisd.config.ServerConfig;
+import io.kamax.mxisd.config.sql.GenericSqlProviderConfig;
+import io.kamax.mxisd.invitation.InvitationManager;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class GenericSqlAuthProvider implements AuthenticatorProvider {
+
+    private Logger log = LoggerFactory.getLogger(GenericSqlAuthProvider.class);
+
+    @Autowired
+    private ServerConfig srvCfg;
+
+    @Autowired
+    private GenericSqlProviderConfig cfg;
+
+    @Autowired
+    private InvitationManager invMgr;
+
+    @Override
+    public boolean isEnabled() {
+        return cfg.isEnabled();
+    }
+
+    @Override
+    public BackendAuthResult authenticate(_MatrixID mxid, String password) {
+        log.info("Performing dummy authentication try to force invite mapping refresh");
+
+        invMgr.lookupMappingsForInvites();
+        return BackendAuthResult.failure();
+    }
+
+}