Initial commit

build.gradle.kts

@@ -0,0 +1,45 @@
+plugins {
+    kotlin("jvm") version "1.6.21"
+    java
+}
+
+group = "io.delilaheve"
+version = "1.0.0"
+
+repositories {
+    mavenCentral()
+    maven(url = "https://hub.spigotmc.org/nexus/content/repositories/snapshots/")
+}
+
+dependencies {
+
+    implementation(kotlin("stdlib"))
+
+    compileOnly("org.spigotmc:spigot-api:1.16.5-R0.1-SNAPSHOT")
+
+    testImplementation("org.junit.jupiter:junit-jupiter-api:5.9.0")
+
+    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine")
+
+}
+
+tasks.getByName<Test>("test") {
+    useJUnitPlatform()
+}
+
+// Fat-jar builder
+val fatJar = tasks.register<Jar>("fatJar") {
+    manifest {
+        attributes.apply { put("Main-Class", "io.delilaheve.UnsafeEnchants") }
+    }
+    archiveFileName.set("${rootProject.name}-${version}.jar")
+    exclude("META-INF/*.RSA", "META-INF/*.SF", "META-INF/*.DSA")
+    duplicatesStrategy = DuplicatesStrategy.WARN
+    from(configurations.runtimeClasspath.get().map { if (it.isDirectory) it else zipTree(it) })
+    with(tasks.jar.get() as CopySpec)
+}
+
+// Ensure fatJar and copyJar are run
+tasks.getByName("build") {
+    dependsOn(fatJar)
+}

gradle.properties

@@ -0,0 +1 @@
+kotlin.code.style=official

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MSYS* | MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1,2 @@
+rootProject.name = "UnsafeEnchants"
+

src/main/kotlin/io/delilaheve/AnvilEventListener.kt

@@ -0,0 +1,88 @@
+package io.delilaheve
+
+import io.delilaheve.util.ConfigOptions
+import io.delilaheve.util.EnchantmentUtil.calculateValue
+import io.delilaheve.util.EnchantmentUtil.combineWith
+import io.delilaheve.util.ItemUtil.canMergeWith
+import io.delilaheve.util.ItemUtil.findEnchantments
+import io.delilaheve.util.ItemUtil.isBook
+import io.delilaheve.util.ItemUtil.setEnchantmentsUnsafe
+import org.bukkit.Material
+import org.bukkit.entity.Player
+import org.bukkit.event.Event
+import org.bukkit.event.EventHandler
+import org.bukkit.event.Listener
+import org.bukkit.event.inventory.InventoryClickEvent
+import org.bukkit.event.inventory.PrepareAnvilEvent
+import org.bukkit.inventory.AnvilInventory
+import org.bukkit.inventory.InventoryView
+import org.bukkit.permissions.Permission
+import kotlin.math.min
+
+/**
+ * Listener for anvil events
+ */
+class AnvilEventListener : Listener {
+
+    companion object {
+        // Vanilla repair cost limit
+        private const val VANILLA_REPAIR_LIMIT = 40
+        // Anvil's output slot
+        private const val ANVIL_OUTPUT_SLOT = 2
+    }
+
+    // Permission node required for the plugin to take over enchantment combination
+    private val requirePermission: Permission
+        get() = Permission(UnsafeEnchants.unsafePermission)
+
+    /**
+     * Event handler logic for when an anvil contains items to be combined
+     */
+    @EventHandler
+    fun anvilCombineCheck(event: PrepareAnvilEvent) {
+        val inventory = event.inventory
+        val first = inventory.getItem(0) ?: return
+        val second = inventory.getItem(1) ?: return
+        if (first.canMergeWith(second)) {
+            val firstEnchants = first.findEnchantments().toMutableMap()
+            val secondEnchants = second.findEnchantments().toMutableMap()
+            if (ConfigOptions.removeRepairLimit) {
+                inventory.maximumRepairCost = Int.MAX_VALUE
+            }
+            val newEnchants = firstEnchants.combineWith(secondEnchants)
+            val enchantsString = newEnchants.map { "${it.key.key} ${it.value}" }.joinToString(", ")
+            UnsafeEnchants.log("New enchants for this item: $enchantsString")
+            val resultItem = first.clone()
+            resultItem.setEnchantmentsUnsafe(newEnchants)
+            val firstValue = firstEnchants.calculateValue(first.isBook())
+            val secondValue = secondEnchants.calculateValue(second.isBook())
+            var repairCost = firstValue + secondValue
+            if (first.isBook() && second.isBook()) {
+                repairCost = firstEnchants.values.sum() + secondEnchants.values.sum()
+            }
+            if (ConfigOptions.limitRepairCost) {
+                repairCost = min(repairCost, VANILLA_REPAIR_LIMIT)
+            }
+            inventory.repairCost = repairCost
+            event.view.setProperty(InventoryView.Property.REPAIR_COST, repairCost)
+            event.result = resultItem
+        }
+    }
+
+    /**
+     * Event handler logic for when a player is trying to pull an item out of the anvil
+     */
+    @EventHandler(ignoreCancelled = true)
+    fun anvilExtractionCheck(event: InventoryClickEvent) {
+        val player = event.whoClicked as? Player ?: return
+        if (player.hasPermission(requirePermission)) {
+            val inventory = event.inventory as? AnvilInventory ?: return
+            if (event.rawSlot != ANVIL_OUTPUT_SLOT) { return }
+            val output = inventory.getItem(2) ?: return
+            if (output.type == Material.AIR) { return }
+            if (player.level < inventory.repairCost) { return }
+            event.result = Event.Result.ALLOW
+        }
+    }
+
+}

src/main/kotlin/io/delilaheve/UnsafeEnchants.kt

@@ -0,0 +1,40 @@
+package io.delilaheve
+
+import io.delilaheve.util.ConfigOptions
+import org.bukkit.plugin.java.JavaPlugin
+
+/**
+ * Bukkit/Spigot/Paper plugin to alter enchantment max
+ * levels and allow unsafe enchantment combinations
+ */
+class UnsafeEnchants : JavaPlugin() {
+
+    companion object {
+        // Permission string required to use the plugin's features
+        const val unsafePermission = "ue.unsafe"
+        // Current plugin instance
+        lateinit var instance: UnsafeEnchants
+
+        /**
+         * Logging handler
+         */
+        fun log(message: String) {
+            if (ConfigOptions.debugLog) {
+                instance.logger.info(message)
+            }
+        }
+    }
+
+    /**
+     * Setup plugin for use
+     */
+    override fun onEnable() {
+        instance = this
+        saveDefaultConfig()
+        server.pluginManager.registerEvents(
+            AnvilEventListener(),
+            this
+        )
+    }
+
+}

src/main/kotlin/io/delilaheve/util/ConfigOptions.kt

@@ -0,0 +1,124 @@
+package io.delilaheve.util
+
+import io.delilaheve.UnsafeEnchants
+import io.delilaheve.util.EnchantmentUtil.enchantmentName
+import org.bukkit.enchantments.Enchantment
+
+/**
+ * Config option accessors
+ */
+object ConfigOptions {
+
+    // Path for default enchantment limits
+    private const val DEFAULT_LIMIT_PATH = "default_limit"
+    // Path for allowing unsafe enchants
+    private const val ALLOW_UNSAFE_PATH = "allow_unsafe"
+    // Path for limiting repair cost
+    private const val LIMIT_REPAIR_COST = "limit_repair_cost"
+    // Path for removing repair cost limits
+    private const val REMOVE_REPAIR_LIMIT = "remove_repair_limit"
+    // Root path for enchantment limits
+    private const val ENCHANT_LIMIT_ROOT = "enchant_limits"
+    // Root path for enchantment values
+    private const val ENCHANT_VALUES_ROOT = "enchant_values"
+    // Keys for specific enchantment values
+    private const val KEY_BOOK = "book"
+    private const val KEY_ITEM = "item"
+    // Debug logging toggle path
+    private const val DEBUG_LOGGING = "debug_log"
+
+    // Default value for enchantment limits
+    private const val DEFAULT_ENCHANT_LIMIT = 10
+    // Default value for allowing unsafe enchantments
+    private const val DEFAULT_ALLOW_UNSAFE = true
+    // Default value for limiting repair cost
+    private const val DEFAULT_LIMIT_REPAIR = true
+    // Default for removing repair cost limits
+    private const val DEFAULT_REMOVE_LIMIT = false
+    // Valid range for an enchantment limit
+    private val ENCHANT_LIMIT_RANGE = 1..255
+    // Default value for an enchantment multiplier
+    private const val DEFAULT_ENCHANT_VALUE = 0
+    // Default value for debug logging
+    private const val DEFAULT_DEBUG_LOG = false
+
+    /**
+     * Default enchantment limit
+     */
+    private val defaultEnchantLimit: Int
+        get() {
+            return UnsafeEnchants.instance
+                .config
+                .getInt(DEFAULT_LIMIT_PATH, DEFAULT_ENCHANT_LIMIT)
+        }
+
+    /**
+     * Whether to allow unsafe enchantments
+     */
+    val allowUnsafe: Boolean
+        get() {
+            return UnsafeEnchants.instance
+                .config
+                .getBoolean(ALLOW_UNSAFE_PATH, DEFAULT_ALLOW_UNSAFE)
+        }
+
+    /**
+     * Whether to limit repair costs to the vanilla limit
+     */
+    val limitRepairCost: Boolean
+        get() {
+            return UnsafeEnchants.instance
+                .config
+                .getBoolean(LIMIT_REPAIR_COST, DEFAULT_LIMIT_REPAIR)
+        }
+
+    /**
+     * Whether to remove repair cost limit
+     */
+    val removeRepairLimit: Boolean
+        get() {
+            return UnsafeEnchants.instance
+                .config
+                .getBoolean(REMOVE_REPAIR_LIMIT, DEFAULT_REMOVE_LIMIT)
+        }
+
+    /**
+     * Whether to show debug logging
+     */
+    val debugLog: Boolean
+        get() {
+            return UnsafeEnchants.instance
+                .config
+                .getBoolean(DEBUG_LOGGING, DEFAULT_DEBUG_LOG)
+        }
+
+    /**
+     * Get the given [enchantment]'s limit
+     */
+    fun enchantLimit(enchantment: Enchantment): Int {
+        val path = "${ENCHANT_LIMIT_ROOT}.${enchantment.enchantmentName}"
+        return UnsafeEnchants.instance
+            .config
+            .getInt(path, defaultEnchantLimit)
+            .takeIf { it in ENCHANT_LIMIT_RANGE }
+            ?: defaultEnchantLimit
+    }
+
+    /**
+     * Get the appropriate [enchantment]'s value dependent on whether
+     * it's source [isFromBook]
+     */
+    fun enchantmentValue(
+        enchantment: Enchantment,
+        isFromBook: Boolean
+    ): Int {
+        val typeKey = if (isFromBook) KEY_BOOK else KEY_ITEM
+        val path = "${ENCHANT_VALUES_ROOT}.${enchantment.enchantmentName}.$typeKey"
+        return UnsafeEnchants.instance
+            .config
+            .getInt(path, DEFAULT_ENCHANT_VALUE)
+            .takeIf { it >= DEFAULT_ENCHANT_VALUE }
+            ?: DEFAULT_ENCHANT_VALUE
+    }
+
+}

src/main/kotlin/io/delilaheve/util/EnchantmentUtil.kt

@@ -0,0 +1,64 @@
+package io.delilaheve.util
+
+import io.delilaheve.UnsafeEnchants
+import org.bukkit.enchantments.Enchantment
+import kotlin.math.max
+import kotlin.math.min
+
+/**
+ * Enchantment manipulation utilities
+ */
+object EnchantmentUtil {
+
+    val Enchantment.enchantmentName: String
+        get() = key.key
+    /**
+     * Combine 2 sets of enchantments according to our configuration
+     */
+    fun MutableMap<Enchantment, Int>.combineWith(
+        other: MutableMap<Enchantment, Int>
+    ) = mutableMapOf<Enchantment, Int>().apply {
+        putAll(this@combineWith)
+        other.forEach { (enchantment, level) ->
+            when {
+                // Enchantment not yet in result list
+                !containsKey(enchantment) -> {
+                    // Add the enchantment if it doesn't have conflicts, or, if we're allowing unsafe enchantments
+                    if (!keys.any { enchantment.conflictsWith(it) } || ConfigOptions.allowUnsafe) {
+                        this[enchantment] = level
+                    }
+                }
+                // Enchantment already in result list...
+                else -> when {
+                    // ... and they're not the same level
+                    this[enchantment] != other[enchantment] -> {
+                        val newLevel = max(this[enchantment] ?: 0, other[enchantment] ?: 0)
+                        // apply the greater of the two if non-zero
+                        if (newLevel > 0) { this[enchantment] = newLevel }
+                    }
+                    // ... and they're the same level
+                    else -> {
+                        // try to increase the enchantment level by 1
+                        var newLevel = this[enchantment]?.plus(1) ?: 0
+                        val maxLevel = ConfigOptions.enchantLimit(enchantment)
+                        newLevel = min(newLevel, maxLevel)
+                        if (newLevel > 0) { this[enchantment] = newLevel }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Calculate the value of a set of enchantments
+     */
+    fun Map<Enchantment, Int>.calculateValue(
+        fromBook: Boolean
+    ) = entries.sumOf { (enchantment, level) ->
+        val enchantmentMultiplier = ConfigOptions.enchantmentValue(enchantment, fromBook)
+        val value = level * enchantmentMultiplier
+        UnsafeEnchants.log("Value for ${enchantment.enchantmentName} is $value")
+        value
+    }
+
+}

src/main/kotlin/io/delilaheve/util/ItemUtil.kt

@@ -0,0 +1,83 @@
+package io.delilaheve.util
+
+import io.delilaheve.UnsafeEnchants
+import org.bukkit.Material.BOOK
+import org.bukkit.Material.ENCHANTED_BOOK
+import org.bukkit.enchantments.Enchantment
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.EnchantmentStorageMeta
+
+/**
+ * Item manipulation utilities
+ */
+object ItemUtil {
+
+    /**
+     * Check if this [ItemStack] is a [BOOK] or [ENCHANTED_BOOK]
+     */
+    fun ItemStack.isBook() = type in listOf(BOOK, ENCHANTED_BOOK)
+
+    /**
+     * Check if this [ItemStack] is an [ENCHANTED_BOOK]
+     */
+    private fun ItemStack.isEnchantedBook() = type == ENCHANTED_BOOK
+
+    /**
+     * Determine if this [ItemStack] can hold enchants, this should be sufficient for
+     * detecting if an item is a tool/armour/etc... and not a carrot/potato/etc...
+     */
+    private fun ItemStack.canHoldEnchants() = Enchantment.values()
+        .any { it.canEnchantItem(this) }
+
+    /**
+     * Find the enchantment map for this [ItemStack] and return it as a [MutableMap]
+     */
+    fun ItemStack.findEnchantments() = if (isBook()) {
+        (itemMeta as? EnchantmentStorageMeta)?.storedEnchants ?: emptyMap()
+    } else {
+        itemMeta?.enchants ?: emptyMap()
+    }
+
+    /**
+     * Apply an [enchantments] map to this [ItemStack]
+     */
+    fun ItemStack.setEnchantmentsUnsafe(enchantments: Map<Enchantment, Int>) {
+        if (isBook()) {
+            /* For some god-forsaken reason, item meta is not mutable
+             * so, we have to get the instance, modify it, then set it
+             * back to the item... #BecauseMinecraft */
+            val bookMeta = (itemMeta as? EnchantmentStorageMeta)
+            bookMeta?.replaceEnchants(enchantments)
+            itemMeta = bookMeta
+        } else {
+            itemMeta?.enchants?.forEach { (enchant, _) ->
+                removeEnchantment(enchant)
+            }
+            addUnsafeEnchantments(enchantments)
+        }
+    }
+
+    /**
+     * Apply an [enchantments] map to this book
+     */
+    private fun EnchantmentStorageMeta.replaceEnchants(
+        enchantments: Map<Enchantment, Int>
+    ) {
+        storedEnchants.forEach { (enchant, _) ->
+            removeStoredEnchant(enchant)
+        }
+        enchantments.forEach { (enchant, level) ->
+            val added = addStoredEnchant(enchant, level, true)
+            UnsafeEnchants.log("${enchant.key} added to item? $added")
+        }
+    }
+
+    /**
+     * Check that this [ItemStack] can merge with the [other]
+     *
+     * The two items should either be the same type, or, the [other] is a book
+     */
+    fun ItemStack.canMergeWith(
+        other: ItemStack
+    ) = type == other.type || (canHoldEnchants() && other.isEnchantedBook())
+}

src/main/resources/config.yml

@@ -0,0 +1,202 @@
+# Default limit to apply to any enchants missing from override_limits
+#
+# Valid range of 1 - 255
+default_limit: 10
+
+# Whether enchants should be combined without regard for conflicts by default
+#
+# This setting will override permissions, if a player has ue.unsafe but this is false
+# they will be unable to combine conflicting enchantments
+#
+# i.e. Protection and Blast Protection can be on the same piece of armour
+allow_unsafe: true
+
+# Whether all anvil actions should be capped to the vanilla repair limit (40 levels)
+limit_repair_cost: true
+
+# Whether the anvil's repair limit should be removed entirely
+#
+# The anvil will still visually display "too expensive" however the action will be completable
+remove_repair_limit: false
+
+# Override limits for specific enchants
+#
+# Enchantments not listed here will use the value of default_limit
+#
+# Overrides provided default to 1 in vanilla and won't change effect with extra levels
+# with exceptions to this rule having their own comment
+#
+# Valid range of 1 - 255 for each enchantment
+enchant_limits:
+  aqua_affinity: 1
+  binding_curse: 1
+  channeling: 1
+  flame: 1
+  infinity: 1
+  mending: 1
+  multishot: 1
+  silk_touch: 1
+  vanishing_curse: 1
+  depth_strider: 3 # anything more than 3 is treated as 3 by the game
+#  bane_of_arthropods: 1
+#  blast_protection: 1
+#  efficiency: 1
+#  feather_falling: 1
+#  fire_aspect: 1
+#  fire_protection: 1
+#  fortune: 1
+#  frost_walker: 1
+#  impaling: 1
+#  knockback: 1
+#  looting: 1
+#  loyalty: 1
+#  luck_of_the_sea: 1
+#  lure: 1
+#  piercing: 1
+#  power: 1
+#  projectile_protection: 1
+#  protection: 1
+#  punch: 1
+#  quick_charge: 1
+#  respiration: 1
+#  riptide: 1
+#  sharpness: 1
+#  smite: 1
+#  soul_speed: 1
+#  sweeping: 1
+#  swift_sneak: 1
+#  thorns: 1
+#  unbreaking: 1
+
+# Multipliers used to calculate the enchantment's value in repair/combining
+#
+# Values here are pulled from the fandom wiki:
+# https://minecraft.fandom.com/wiki/Anvil_mechanics#Costs_for_combining_enchantments
+#
+# If an enchantment is missing values here, or is less than 0, it will default to 0
+#
+# Calculated as: [Enchantment lvl] * [multiplier]
+#
+# With default values protection 4 would have a value of 4 when
+# coming from either a book (4 * 1) or an item (4 * 1)
+enchant_values:
+  aqua_affinity:
+    item: 4
+    book: 2
+  bane_of_arthropods:
+    item: 2
+    book: 1
+  binding_curse:
+    item: 8
+    book: 4
+  blast_protection:
+    item: 4
+    book: 2
+  channeling:
+    item: 8
+    book: 4
+  depth_strider:
+    item: 4
+    book: 2
+  efficiency:
+    item: 1
+    book: 1
+  flame:
+    item: 4
+    book: 2
+  feather_falling:
+    item: 2
+    book: 1
+  fire_aspect:
+    item: 4
+    book: 2
+  fire_protection:
+    item: 2
+    book: 1
+  fortune:
+    item: 4
+    book: 2
+  frost_walker:
+    item: 4
+    book: 2
+  impaling:
+    item: 4
+    book: 2
+  infinity:
+    item: 8
+    book: 4
+  knockback:
+    item: 2
+    book: 1
+  looting:
+    item: 4
+    book: 2
+  loyalty:
+    item: 1
+    book: 1
+  luck_of_the_sea:
+    item: 4
+    book: 2
+  lure:
+    item: 4
+    book: 2
+  mending:
+    item: 4
+    book: 2
+  multishot:
+    item: 4
+    book: 2
+  piercing:
+    item: 1
+    book: 1
+  power:
+    item: 1
+    book: 1
+  projectile_protection:
+    item: 2
+    book: 1
+  protection:
+    item: 1
+    book: 1
+  punch:
+    item: 4
+    book: 2
+  quick_charge:
+    item: 2
+    book: 1
+  respiration:
+    item: 4
+    book: 2
+  riptide:
+    item: 4
+    book: 2
+  silk_touch:
+    item: 8
+    book: 4
+  sharpness:
+    item: 1
+    book: 1
+  smite:
+    item: 2
+    book: 1
+  soul_speed:
+    item: 8
+    book: 4
+  swift_sneak:
+    item: 8
+    book: 4
+  sweeping:
+    item: 4
+    book: 2
+  thorns:
+    item: 8
+    book: 4
+  unbreaking:
+    item: 2
+    book: 1
+  vanishing_curse:
+    item: 8
+    book: 4
+
+# Whether to show debug logging
+debug_log: false

src/main/resources/plugin.yml

@@ -0,0 +1,11 @@
+main: io.delilaheve.UnsafeEnchants
+name: UnsafeEnchants
+version: 1.0.0
+description: Allow all enchants to be combined
+api-version: 1.18
+load: POSTWORLD
+author: DelilahEve
+permissions:
+  ue.unsafe:
+    default: true
+    description: Allow player to combine "unsafe" enchants