From 8f870f092e6b808ef8aecd5a8cff23faa1026ba8 Mon Sep 17 00:00:00 2001
From: Gareth Coles <gdude2002@gmail.com>
Date: Thu, 11 May 2023 21:53:01 +0100
Subject: [PATCH] Logs: Java class version incompats

---
 .../logs/config/SimpleLogParserConfig.kt      |  2 +
 .../JavaClassFileVersionProcessor.kt          | 96 +++++++++++++++++++
 2 files changed, 98 insertions(+)
 create mode 100644 module-log-parser/src/main/kotlin/org/quiltmc/community/cozy/modules/logs/processors/JavaClassFileVersionProcessor.kt

diff --git a/module-log-parser/src/main/kotlin/org/quiltmc/community/cozy/modules/logs/config/SimpleLogParserConfig.kt b/module-log-parser/src/main/kotlin/org/quiltmc/community/cozy/modules/logs/config/SimpleLogParserConfig.kt
index 8227b3c8..35dde5cf 100644
--- a/module-log-parser/src/main/kotlin/org/quiltmc/community/cozy/modules/logs/config/SimpleLogParserConfig.kt
+++ b/module-log-parser/src/main/kotlin/org/quiltmc/community/cozy/modules/logs/config/SimpleLogParserConfig.kt
@@ -16,6 +16,7 @@ import org.quiltmc.community.cozy.modules.logs.parsers.launchers.ATLauncherParse
 import org.quiltmc.community.cozy.modules.logs.parsers.launchers.MMCLikeParser
 import org.quiltmc.community.cozy.modules.logs.parsers.launchers.TechnicParser
 import org.quiltmc.community.cozy.modules.logs.parsers.quilt.QuiltModsParser
+import org.quiltmc.community.cozy.modules.logs.processors.JavaClassFileVersionProcessor
 import org.quiltmc.community.cozy.modules.logs.processors.MixinErrorProcessor
 import org.quiltmc.community.cozy.modules.logs.processors.PlayerIPProcessor
 import org.quiltmc.community.cozy.modules.logs.processors.UnknownModProcessor
@@ -55,6 +56,7 @@ public class SimpleLogParserConfig(private val builder: Builder) : LogParserConf
 		public var processors: MutableList<LogProcessor> = mutableListOf(
 			FabricImplProcessor(),
 			IncompatibleModProcessor(),
+			JavaClassFileVersionProcessor(),
 			MixinErrorProcessor(),
 			PlayerIPProcessor(),
 			QuiltLibrariesVersionProcessor(),
diff --git a/module-log-parser/src/main/kotlin/org/quiltmc/community/cozy/modules/logs/processors/JavaClassFileVersionProcessor.kt b/module-log-parser/src/main/kotlin/org/quiltmc/community/cozy/modules/logs/processors/JavaClassFileVersionProcessor.kt
new file mode 100644
index 00000000..1489a6f0
--- /dev/null
+++ b/module-log-parser/src/main/kotlin/org/quiltmc/community/cozy/modules/logs/processors/JavaClassFileVersionProcessor.kt
@@ -0,0 +1,96 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+package org.quiltmc.community.cozy.modules.logs.processors
+
+import dev.kord.core.event.Event
+import org.quiltmc.community.cozy.modules.logs.data.LoaderType
+import org.quiltmc.community.cozy.modules.logs.data.Log
+import org.quiltmc.community.cozy.modules.logs.data.Order
+import org.quiltmc.community.cozy.modules.logs.types.LogProcessor
+
+private val ERROR_REGEX = (
+	"has been compiled by a more recent version of the Java Runtime " +
+		"\\(class file version ([\\d\\.]+)\\), this version of the Java Runtime only recognizes class file versions " +
+		"up to ([\\d\\.]+)"
+	).toRegex(RegexOption.IGNORE_CASE)
+
+// I'm not sure why it thinks these aren't constants, but okay...
+@Suppress("MagicNumber")
+private val VERSION_MAP = mutableMapOf(
+	45 to "1.1",
+	46 to "1.2",
+	47 to "1.3",
+	48 to "1.4",
+	49 to "5",
+	50 to "6",
+	51 to "7",
+	52 to "8",
+	53 to "9",
+	54 to "10",
+	55 to "11",
+	56 to "12",
+	57 to "13",
+	58 to "14",
+	59 to "15",
+	60 to "16",
+	61 to "17",
+	62 to "18",
+	63 to "19",
+	64 to "20",
+	65 to "21",
+)
+
+public class JavaClassFileVersionProcessor : LogProcessor() {
+	override val identifier: String = "piracy"
+	override val order: Order = Order.Earlier
+
+	override suspend fun predicate(log: Log, event: Event): Boolean =
+		log.getLoaderVersion(LoaderType.Quilt) != null
+
+	override suspend fun process(log: Log) {
+		val matches = ERROR_REGEX.findAll(log.content).toList()
+
+		if (matches.isEmpty()) {
+			return
+		}
+
+		// Required -> Current
+		val versions = matches.map { it.groupValues[1].toInt() to it.groupValues[2].toInt() }
+		val currentClass = versions.first().second
+
+		var requiredClass: Int = 0
+
+		versions.forEach { requiredClass = maxOf(requiredClass, it.first) }
+
+		val current = VERSION_MAP[currentClass]
+		val required = VERSION_MAP[requiredClass]
+
+		log.addMessage(
+			buildString {
+				append("**It looks like you need to update Java.** ")
+
+				append(
+					if (current != null) {
+						"You have Java `$current` installed, "
+					} else {
+						"You have a version of Java that supports up to class version `$currentClass`, "
+					}
+				)
+
+				append(
+					if (required != null) {
+						"but you need Java `$required` or later."
+					} else {
+						"but you need a version of java that supports class version `$requiredClass` or later."
+					}
+				)
+			}
+		)
+
+		log.hasProblems = true
+	}
+}