Add the postgresql backend for internal storage.

src/main/java/io/kamax/mxisd/config/PostgresqlStorageConfig.java

@@ -0,0 +1,54 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2017 Kamax Sarl
+ *
+ * https://www.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.config;
+
+public class PostgresqlStorageConfig {
+
+    private String database;
+
+    private String username;
+
+    private String password;
+
+    public String getDatabase() {
+        return database;
+    }
+
+    public void setDatabase(String database) {
+        this.database = database;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+}

src/main/java/io/kamax/mxisd/config/StorageConfig.java

@@ -21,14 +21,21 @@
 package io.kamax.mxisd.config;
 
 import io.kamax.mxisd.exception.ConfigurationException;
-import org.apache.commons.lang.StringUtils;
 
 public class StorageConfig {
 
+    public enum BackendEnum {
+        sqlite,
+
+        postgresql
+    }
+
     public static class Provider {
 
         private SQLiteStorageConfig sqlite = new SQLiteStorageConfig();
 
+        private PostgresqlStorageConfig postgresql = new PostgresqlStorageConfig();
+
         public SQLiteStorageConfig getSqlite() {
             return sqlite;
         }
@@ -37,16 +44,23 @@ public class StorageConfig {
             this.sqlite = sqlite;
         }
 
+        public PostgresqlStorageConfig getPostgresql() {
+            return postgresql;
+        }
+
+        public void setPostgresql(PostgresqlStorageConfig postgresql) {
+            this.postgresql = postgresql;
+        }
     }
 
-    private String backend = "sqlite";
+    private BackendEnum backend = BackendEnum.sqlite; // or postgresql
     private Provider provider = new Provider();
 
-    public String getBackend() {
+    public BackendEnum getBackend() {
         return backend;
     }
 
-    public void setBackend(String backend) {
+    public void setBackend(BackendEnum backend) {
         this.backend = backend;
     }
 
@@ -59,7 +73,7 @@ public class StorageConfig {
     }
 
     public void build() {
-        if (StringUtils.isBlank(getBackend())) {
+        if (getBackend() == null) {
             throw new ConfigurationException("storage.backend");
         }
     }