Added Database class and Account record

.idea/dataSources.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
+    <data-source source="LOCAL" name="chat_rsa@localhost" uuid="8cab1bef-0c27-42d9-ae74-3ac57094560d">
+      <driver-ref>mariadb</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>org.mariadb.jdbc.Driver</jdbc-driver>
+      <jdbc-url>jdbc:mariadb://localhost:3306/chat_rsa</jdbc-url>
+      <jdbc-additional-properties>
+        <property name="com.intellij.clouds.kubernetes.db.host.port" />
+        <property name="com.intellij.clouds.kubernetes.db.enabled" value="false" />
+        <property name="com.intellij.clouds.kubernetes.db.resource.type" value="Deployment" />
+        <property name="com.intellij.clouds.kubernetes.db.container.port" />
+      </jdbc-additional-properties>
+      <working-dir>$ProjectFileDir$</working-dir>
+    </data-source>
+  </component>
+</project>

.idea/sqldialects.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="SqlDialectMappings">
+    <file url="file://$PROJECT_DIR$/src/main/java/controllers/Database.java" dialect="GenericSQL" />
+  </component>
+</project>

pom.xml

@@ -8,6 +8,30 @@
     <artifactId>chat-rsa</artifactId>
     <version>1.0-SNAPSHOT</version>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.mariadb.jdbc</groupId>
+            <artifactId>mariadb-java-client</artifactId>
+            <version>LATEST</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-core</artifactId>
+            <version>6.2.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>2.0.12</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-jdk14</artifactId>
+            <version>2.0.12</version>
+            <scope>runtime</scope>
+        </dependency>
+    </dependencies>
+
     <properties>
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>

src/main/java/controllers/Database.java

@@ -0,0 +1,79 @@
+package controllers;
+
+import models.Account;
+import org.mariadb.jdbc.MariaDbBlob;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+
+import java.math.BigInteger;
+import java.sql.*;
+
+public class Database {
+    public static boolean register(String username, String password, BigInteger e, BigInteger d, BigInteger n) {
+        try (Connection connection = getConnection()) {
+            if (connection == null) return false;
+
+            PasswordEncoder encoder = new BCryptPasswordEncoder();
+            String hashedPass = encoder.encode(password);
+
+            try (PreparedStatement statement = connection.prepareStatement("""
+        INSERT INTO accounts(username, password, e, d, n)
+        VALUES (?, ?, ?, ?, ?)
+      """)) {
+                statement.setString(1, username);
+                statement.setString(2, hashedPass);
+                statement.setBlob(3, new MariaDbBlob(e.toString().getBytes()));
+                statement.setBlob(4, new MariaDbBlob(d.toString().getBytes()));
+                statement.setBlob(5, new MariaDbBlob(n.toString().getBytes()));
+
+                int rowsInserted = statement.executeUpdate();
+                return rowsInserted == 1;
+            } catch (SQLException ex) {
+                System.err.println("Error while trying to create a new account: " + ex);
+                return false;
+            }
+        } catch (SQLException ex) {
+            System.err.println("Error while trying to open a connection in: " + ex);
+            return false;
+        }
+    }
+
+    public static Account login(String username, CharSequence password) {
+        try (Connection connection = getConnection()) {
+            if (connection == null) return null;
+
+            try (PreparedStatement statement = connection.prepareStatement("""
+            SELECT id, password, e, d, n
+            FROM accounts
+            WHERE username = ?
+        """)) {
+                statement.setString(1, username);
+                ResultSet resultSet = statement.executeQuery();
+                if (resultSet.next()) {
+                    int id = resultSet.getInt("id");
+                    String hash_password = resultSet.getString("password");
+                    BigInteger e = new BigInteger(resultSet.getString("e"));
+                    BigInteger d = new BigInteger(resultSet.getString("d"));
+                    BigInteger n = new BigInteger(resultSet.getString("n"));
+                    PasswordEncoder encoder = new BCryptPasswordEncoder();
+                    if (encoder.matches(password, hash_password))
+                        return new Account(id, username, e, d, n);
+                }
+                return null;
+            } catch (SQLException e) {
+                System.err.println("Error while trying to logging in: " + e);
+                return null;
+            }
+        } catch (SQLException e) {
+            System.err.println("Error while trying to open a connection in: " + e);
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(
+                System.getenv("db_url"),
+                System.getenv("db_user"), System.getenv("db_pass")
+        );
+    }
+}

src/main/java/models/Account.java

@@ -0,0 +1,6 @@
+package models;
+
+import java.math.BigInteger;
+
+public record Account(int id, String username, BigInteger e, BigInteger d, BigInteger n) {
+}