Add JWT-based login flow with key pair generation

Introduced a secure login flow using JWTs with dynamically generated RSA key pairs stored in the database. Updated relevant APIs, database schema, and services to support login codes, JWT encoding, and secret validation.

database/src/main/java/com/alttd/altitudeweb/database/web_db/KeyPairEntity.java

@@ -0,0 +1,16 @@
+package com.alttd.altitudeweb.database.web_db;
+
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.AllArgsConstructor;
+import java.time.Instant;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class KeyPairEntity {
+    private int id;
+    private String privateKey;
+    private String publicKey;
+    private Instant createdAt;
+}

database/src/main/java/com/alttd/altitudeweb/database/web_db/KeyPairMapper.java

@@ -0,0 +1,15 @@
+package com.alttd.altitudeweb.database.web_db;
+
+import org.apache.ibatis.annotations.*;
+
+public interface KeyPairMapper {
+    
+    @Select("SELECT * FROM key_pair ORDER BY id DESC LIMIT 1")
+    KeyPairEntity getKeyPair();
+    
+    @Insert("""
+            INSERT INTO key_pair (id, private_key, public_key, created_at)
+            VALUES (#{id}, #{privateKey}, #{publicKey}, #{createdAt})
+            """)
+    void save(KeyPairEntity keyPair);
+}

database/src/main/java/com/alttd/altitudeweb/setup/Connection.java

@@ -87,6 +87,7 @@ public class Connection {
         log.debug("Loaded default database settings {}", databaseSettings);
         Connection connection = new Connection(databaseSettings, addMappers);
         log.debug("Created default database connection {}", connection);
+        connections.put(Databases.DEFAULT, connection);
         return CompletableFuture.completedFuture(connection);
     }
 

database/src/main/java/com/alttd/altitudeweb/setup/InitializeWebDb.java

@@ -1,6 +1,7 @@
 package com.alttd.altitudeweb.setup;
 
 import com.alttd.altitudeweb.database.Databases;
+import com.alttd.altitudeweb.database.web_db.KeyPairMapper;
 import com.alttd.altitudeweb.database.web_db.SettingsMapper;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.ibatis.session.SqlSession;
@@ -12,12 +13,16 @@ import java.sql.Statement;
 public class InitializeWebDb {
 
     protected static void init() {
-        log.info("Initializing LiteBans");
+        log.info("Initializing WebDb");
         Connection.getConnection(Databases.DEFAULT, (configuration) -> {
                     configuration.addMapper(SettingsMapper.class);
+                    configuration.addMapper(KeyPairMapper.class);
                 }).join()
-                .runQuery(InitializeWebDb::createSettingsTable);
-        log.debug("Initialized LuckPerms");
+                .runQuery(SqlSession -> {
+                    createSettingsTable(SqlSession);
+                    createKeyTable(SqlSession);
+                });
+        log.debug("Initialized WebDb");
     }
 
     private static void createSettingsTable(SqlSession sqlSession) {
@@ -40,4 +45,20 @@ public class InitializeWebDb {
         }
     }
 
+    private static void createKeyTable(SqlSession sqlSession) {
+        String query = """
+                CREATE TABLE IF NOT EXISTS key_pair (
+                    id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
+                    private_key TEXT NOT NULL,
+                    public_key TEXT NOT NULL,
+                    created_at TIMESTAMP NOT NULL
+                );
+                """;
+        try (Statement statement = sqlSession.getConnection().createStatement()) {
+            statement.execute(query);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
 }