Add H2 and MySQL support

src/main/kotlin/net.quiltservertools.ledger.databases/DatabaseExtensionSpec.kt

@@ -0,0 +1,11 @@
+package net.quiltservertools.ledger.databases
+
+import com.github.quiltservertools.libs.com.uchuhimo.konf.ConfigSpec
+
+object DatabaseExtensionSpec : ConfigSpec("database_extensions") {
+    val h2 by optional(false, "h2")
+    val mySql by optional(false, "mysql")
+    val userName by optional("root", "username")
+    val password by optional("", "password")
+    val url by optional("localhost", "url")
+}

src/main/kotlin/net.quiltservertools.ledger.databases/LedgerDatabaseExtension.kt

@@ -0,0 +1,43 @@
+package net.quiltservertools.ledger.databases
+
+import com.github.quiltservertools.ledger.Ledger
+import com.github.quiltservertools.ledger.api.DatabaseExtension
+import com.github.quiltservertools.libs.com.uchuhimo.konf.ConfigSpec
+import net.minecraft.server.MinecraftServer
+import net.minecraft.util.Identifier
+import net.minecraft.util.WorldSavePath
+import org.jetbrains.exposed.sql.Database
+import kotlin.io.path.pathString
+
+class LedgerDatabaseExtension : DatabaseExtension {
+    override fun getConfigSpecs(): List<ConfigSpec> = listOf(DatabaseExtensionSpec)
+
+    override fun getDatabase(server: MinecraftServer): Database {
+        if (Ledger.config()[DatabaseExtensionSpec.h2]) {
+            return Database.connect("jdbc:h2:${server.getSavePath(WorldSavePath.ROOT).resolve("ledger.h2").toFile()};MODE=MySQL", "org.h2.Driver")
+        } else if (Ledger.config()[DatabaseExtensionSpec.mySql]) {
+            return Database.connect("jdbc:mysql://${Ledger.config()[DatabaseExtensionSpec.url]}", driver = "com.mysql.cj.jdbc.Driver    ",
+                user = Ledger.config()[DatabaseExtensionSpec.userName], password = Ledger.config()[DatabaseExtensionSpec.password])
+        }
+        return sqlite(server)
+    }
+
+    override fun getIdentifier(): Identifier {
+        if (Ledger.config().contains(DatabaseExtensionSpec.h2) && Ledger.config()[DatabaseExtensionSpec.h2]) {
+            return h2Identifier
+        } else if (Ledger.config().contains(DatabaseExtensionSpec.mySql) && Ledger.config()[DatabaseExtensionSpec.mySql]) {
+            return mySqlIdentifier
+
+        }
+        return Ledger.identifier("sqlite")
+    }
+
+    private fun sqlite(server: MinecraftServer) = Database.connect(
+        url = "jdbc:sqlite:${server.getSavePath(WorldSavePath.ROOT).resolve("ledger.sqlite").pathString}",
+    )
+
+    companion object {
+        val h2Identifier = Ledger.identifier("h2_extension")
+        val mySqlIdentifier = Ledger.identifier("mysql_extension")
+    }
+}

src/main/kotlin/net.quiltservertools.ledger.databases/LedgerDatabases.kt

@@ -0,0 +1,10 @@
+package net.quiltservertools.ledger.databases
+
+import com.github.quiltservertools.ledger.api.ExtensionManager
+import net.fabricmc.api.DedicatedServerModInitializer
+
+class LedgerDatabases : DedicatedServerModInitializer {
+    override fun onInitializeServer() {
+        ExtensionManager.registerExtension(LedgerDatabaseExtension())
+    }
+}