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import java.io.DataInputStream
import java.nio.charset.StandardCharsets
import java.security.MessageDigest
import java.util.HexFormat
import java.util.Locale
import java.util.Properties
import java.util.jar.JarFile
import java.util.regex.Matcher
import org.gradle.api.tasks.WriteProperties
plugins {
id "java"
id "com.gradleup.shadow" version "${shadowVer}"
}
group = "com.github.kaspiandev.antipopup"
def semanticVersion = providers.gradleProperty("pluginVersion").get()
def buildNumber = providers.gradleProperty("pluginBuild").get()
if (!(semanticVersion ==~ /\d+\.\d+\.\d+/)) {
throw new GradleException("pluginVersion must be a semantic version")
}
if (!(buildNumber ==~ /\d{3}/)) {
throw new GradleException("pluginBuild must contain exactly three digits")
}
def releaseVersion = "${semanticVersion}-${buildNumber}"
version = releaseVersion
def expectedPaperTarget = providers.gradleProperty("paperTarget").get()
def expectedPaperApi = providers.gradleProperty("paperApiVersion").get()
def expectedPaperBuild = providers.gradleProperty("paperBuild").get()
def expectedPaperChannel = providers.gradleProperty("paperChannel").get()
def expectedPaperJarName = providers.gradleProperty("paperJarName").get()
def expectedPaperJarSha256 = providers.gradleProperty("paperJarSha256").get()
def javaTarget = providers.gradleProperty("javaTarget").get().toInteger()
def buildJdkVersion = providers.gradleProperty("buildJdkVersion").get()
def runtimeJdk25Version = providers.gradleProperty("runtimeJdk25Version").get()
def runtimeJdk26Version = providers.gradleProperty("runtimeJdk26Version").get()
def expectedPaperApiFromRelease =
"${expectedPaperTarget}.build.${expectedPaperBuild}-${expectedPaperChannel.toLowerCase(Locale.ROOT)}"
if (expectedPaperApi != expectedPaperApiFromRelease) {
throw new GradleException(
"paperApiVersion must match release metadata: ${expectedPaperApiFromRelease}")
}
if (expectedPaperChannel != "STABLE") {
throw new GradleException("Certified releases must use the STABLE Paper channel")
}
if (expectedPaperJarName != "Paper-${expectedPaperTarget}.jar") {
throw new GradleException("paperJarName must use Paper-{version}.jar")
}
if (!(expectedPaperJarSha256 ==~ /[0-9a-f]{64}/)) {
throw new GradleException("paperJarSha256 must be a lowercase SHA-256")
}
if (javaTarget != 25) {
throw new GradleException("AntiPopup must continue to emit Java 25 bytecode")
}
def expectedArchiveName =
"1MB-AntiPopup-v${version}-j${javaTarget}-${expectedPaperTarget}.jar"
def expectedClassMajor = javaTarget + 44
def releaseFacts = [
artifactName : expectedArchiveName,
buildJdkVersion : buildJdkVersion,
buildNumber : buildNumber,
javaTarget : javaTarget.toString(),
paperApiVersion : expectedPaperApi,
paperBuild : expectedPaperBuild,
paperChannel : expectedPaperChannel,
paperJarName : expectedPaperJarName,
paperJarSha256 : expectedPaperJarSha256,
paperTarget : expectedPaperTarget,
runtimeJdk25Version: runtimeJdk25Version,
runtimeJdk26Version: runtimeJdk26Version,
semanticVersion : semanticVersion,
version : releaseVersion
]
repositories {
mavenCentral()
maven {
name = "paper"
url = "https://repo.papermc.io/repository/maven-public/"
}
maven {
name = "codemcReleases"
url = "https://repo.codemc.io/repository/maven-releases/"
}
}
dependencies {
compileOnly("io.papermc.paper:paper-api:${paperApiVersion}") {
exclude group: "org.apache.logging.log4j"
}
implementation("com.github.retrooper:packetevents-spigot:${packetEventsVersion}") {
// Paper supplies Adventure. PacketEvents 2.13 supports Paper's Adventure 5.
exclude group: "net.kyori"
}
// Paper exposes Adventure API 5 (including BinaryTagHolder), but not the
// implementation NBT module. Bundle the matching module without relocating
// its public package so PacketEvents and Paper share one Adventure type system.
implementation("net.kyori:adventure-nbt:${adventureNbtVersion}") {
transitive = false
}
}
java {
toolchain {
languageVersion = JavaLanguageVersion.of(javaTarget)
}
}
def buildCompiler = javaToolchains.compilerFor(java.toolchain)
def verifyBuildJdk = tasks.register("verifyBuildJdk") {
group = "verification"
description = "Verifies the selected compiler matches the recorded release JDK."
inputs.property("expectedVersion", buildJdkVersion)
inputs.property("compilerVersion", buildCompiler.map { it.metadata.javaRuntimeVersion })
doLast {
String actualVersion = inputs.properties.compilerVersion
String expectedVersion = inputs.properties.expectedVersion
if (Runtime.Version.parse(actualVersion).version()
!= Runtime.Version.parse(expectedVersion).version()) {
throw new GradleException(
"Build requires JDK ${expectedVersion}; selected ${actualVersion}. "
+ "Set JAVA_HOME and prepend JAVA_HOME/bin to PATH.")
}
println("Verified build compiler: ${actualVersion}")
}
}
tasks.withType(JavaCompile).configureEach {
dependsOn verifyBuildJdk
options.release = javaTarget
options.encoding = "UTF-8"
options.compilerArgs.addAll(["-Xlint:deprecation", "-Xlint:removal", "-Werror"])
}
processResources {
def props = [version: releaseVersion, paperTarget: expectedPaperTarget]
inputs.properties(props)
filteringCharset = "UTF-8"
filesMatching("plugin.yml") {
expand(props)
}
}
def generatedReleaseMetadataDir = layout.buildDirectory.dir("generated/releaseMetadata")
def generateReleaseMetadata = tasks.register("generateReleaseMetadata", WriteProperties) {
group = "build"
description = "Generates the release facts embedded in the deployable JAR."
destinationFile = generatedReleaseMetadataDir.map {
it.file("META-INF/antipopup-release.properties")
}
comment = "Generated from gradle.properties; do not edit."
releaseFacts.each { key, value -> property(key, value) }
}
sourceSets.main.resources.srcDir(generatedReleaseMetadataDir)
tasks.named("processResources") {
dependsOn generateReleaseMetadata
}
jar {
enabled = false
}
shadowJar {
archiveFileName = expectedArchiveName
archiveClassifier = ""
mergeServiceFiles()
// PacketEvents 2.13 unconditionally constructs its bundled bStats service.
// Rewrite only those three linkage types to inert local shims, then omit the
// complete telemetry implementation from the standalone artifact.
relocate "io.github.retrooper.packetevents.bstats.bukkit.Metrics", "com.github.kaspiandev.antipopup.paper.compat.packetevents.NoOpMetrics"
relocate "io.github.retrooper.packetevents.bstats.charts.CustomChart", "com.github.kaspiandev.antipopup.paper.compat.packetevents.NoOpChart"
relocate "io.github.retrooper.packetevents.bstats.charts.SimplePie", "com.github.kaspiandev.antipopup.paper.compat.packetevents.NoOpSimplePie"
relocate "io.github.retrooper.packetevents", "com.github.kaspiandev.antipopup.libs.packetevents.impl"
relocate "com.github.retrooper.packetevents", "com.github.kaspiandev.antipopup.libs.packetevents.api"
exclude "io/github/retrooper/packetevents/bstats/**"
exclude "META-INF/*.SF", "META-INF/*.DSA", "META-INF/*.RSA"
manifest {
attributes(
"Implementation-Title": "1MB AntiPopup",
"Implementation-Version": releaseVersion,
"Artifact-Name": expectedArchiveName,
"Built-For-Paper": expectedPaperTarget,
"Compiled-Paper-API": expectedPaperApi,
"Paper-Build": expectedPaperBuild,
"Paper-Channel": expectedPaperChannel,
"Build-Java": javaTarget.toString()
)
}
}
assemble {
dependsOn shadowJar
}
def shadowArchive = tasks.named("shadowJar").flatMap { it.archiveFile }
tasks.register("verifyArtifact") {
group = "verification"
description = "Checks the deployable jar's target, bytecode, and removed-feature exclusions."
dependsOn shadowJar
inputs.file(shadowArchive)
doLast {
File archive = inputs.files.singleFile
if (archive.name != expectedArchiveName) {
throw new GradleException(
"Expected artifact ${expectedArchiveName}, found ${archive.name}")
}
new JarFile(archive).withCloseable { jar ->
Set<String> names = jar.entries().collect { it.name } as Set
List<String> forbiddenPrefixes = [
"com/github/kaspiandev/antipopup/velocity/",
"com/github/kaspiandev/antipopup/spigot/",
"com/github/kaspiandev/antipopup/nms/",
"net/md_5/bungee/"
]
forbiddenPrefixes.each { prefix ->
if (names.any { it.startsWith(prefix) }) {
throw new GradleException("Legacy content found in deployable jar: ${prefix}")
}
}
if (names.any { it.contains("/bstats/") }) {
throw new GradleException("bStats implementation found in deployable jar")
}
String forbiddenLog4jPrefix = "org/apache/logging/log4j/"
if (names.any { it.startsWith(forbiddenLog4jPrefix) }) {
throw new GradleException("Log4j implementation found in deployable jar")
}
List<String> metricsShims = [
"com/github/kaspiandev/antipopup/paper/compat/packetevents/NoOpMetrics.class",
"com/github/kaspiandev/antipopup/paper/compat/packetevents/NoOpChart.class",
"com/github/kaspiandev/antipopup/paper/compat/packetevents/NoOpSimplePie.class"
]
if (!names.containsAll(metricsShims)) {
throw new GradleException("PacketEvents metrics suppression shims are missing")
}
String paperPluginPrefix =
"com/github/kaspiandev/antipopup/paper/"
Set<String> expectedPaperClasses = ([
"com/github/kaspiandev/antipopup/paper/AntiPopup.class",
"com/github/kaspiandev/antipopup/paper/listener/PacketEventsListener.class"
] + metricsShims) as Set
Set<String> actualPaperClasses = names.findAll {
it.startsWith(paperPluginPrefix) && it.endsWith(".class")
} as Set
if (actualPaperClasses != expectedPaperClasses) {
Set<String> missing = expectedPaperClasses.findAll {
!actualPaperClasses.contains(it)
} as Set
Set<String> unexpected = actualPaperClasses.findAll {
!expectedPaperClasses.contains(it)
} as Set
throw new GradleException(
"Unexpected AntiPopup class surface; missing=${missing}, unexpected=${unexpected}")
}
String packetEventsBuilder =
"com/github/kaspiandev/antipopup/libs/packetevents/impl/factory/spigot/SpigotPacketEventsBuilder\$1.class"
def packetEventsBuilderEntry = jar.getJarEntry(packetEventsBuilder)
if (packetEventsBuilderEntry == null) {
throw new GradleException("The embedded PacketEvents builder is missing")
}
String packetEventsBuilderBytes = new String(
jar.getInputStream(packetEventsBuilderEntry).readAllBytes(),
StandardCharsets.ISO_8859_1)
metricsShims.each { shim ->
String internalName = shim.substring(0, shim.length() - ".class".length())
if (!packetEventsBuilderBytes.contains(internalName)) {
throw new GradleException(
"PacketEvents metrics linkage was not redirected to ${internalName}")
}
}
if (!names.contains("net/kyori/adventure/nbt/CompoundBinaryTag.class")) {
throw new GradleException("The Paper-aligned Adventure NBT module is missing")
}
if (names.contains("net/kyori/adventure/nbt/api/BinaryTagHolder.class")
|| names.contains("net/kyori/adventure/text/Component.class")) {
throw new GradleException("The deployable jar must use Paper's Adventure API")
}
String brokenAdventurePrefix =
"com/github/kaspiandev/antipopup/libs/adventure/"
List<String> forbiddenOwnMarkers = [
"org/bukkit/command/",
"org/bukkit/configuration/",
"getCommand",
"getConfig",
"reloadConfig",
"saveDefaultConfig",
"server.properties",
"enforce-secure-profile",
"ServerPropertiesService",
"CommandRegister",
"APConfig",
"PluginSettings"
]
names.findAll { it.endsWith(".class") }.each { name ->
String classFile = new String(
jar.getInputStream(jar.getJarEntry(name)).readAllBytes(),
StandardCharsets.ISO_8859_1)
if (classFile.contains(brokenAdventurePrefix)) {
throw new GradleException(
"Found an incompletely relocated Adventure reference in ${name}")
}
if (classFile.contains(forbiddenLog4jPrefix)) {
throw new GradleException(
"Found a Log4j linkage in ${name}")
}
if (name.startsWith(paperPluginPrefix)) {
forbiddenOwnMarkers.each { marker ->
if (classFile.contains(marker)) {
throw new GradleException(
"Found removed command/config/setup linkage in ${name}: ${marker}")
}
}
}
}
if (names.contains("config.yml")) {
throw new GradleException("Removed config.yml found in deployable jar")
}
String listenerClass =
"com/github/kaspiandev/antipopup/paper/listener/PacketEventsListener.class"
String listenerClassBytes = new String(
jar.getInputStream(jar.getJarEntry(listenerClass)).readAllBytes(),
StandardCharsets.ISO_8859_1)
List<String> requiredListenerMarkers = [
"JOIN_GAME",
"isCancelled",
"WrapperPlayServerJoinGame",
"setEnforcesSecureChat"
]
requiredListenerMarkers.each { marker ->
if (!listenerClassBytes.contains(marker)) {
throw new GradleException(
"Popup-only listener behavior is missing: ${marker}")
}
}
List<String> forbiddenListenerMarkers = [
"SERVER_DATA",
"WrapperPlayServerServerData",
"ClientVersion",
"PluginSettings",
"settingsSupplier",
"CHAT_SESSION_UPDATE",
"CHAT_MESSAGE",
"WrapperPlayServerDisguisedChat",
"onPacketReceive"
]
forbiddenListenerMarkers.each { marker ->
if (listenerClassBytes.contains(marker)) {
throw new GradleException(
"Removed listener behavior found in artifact: ${marker}")
}
}
String mainClass = "com/github/kaspiandev/antipopup/paper/AntiPopup.class"
def mainEntry = jar.getJarEntry(mainClass)
if (mainEntry == null) {
throw new GradleException("Paper main class is missing from deployable jar")
}
String mainClassBytes = new String(
jar.getInputStream(mainEntry).readAllBytes(),
StandardCharsets.ISO_8859_1)
List<String> requiredLifecycleMarkers = [
"SpigotPacketEventsBuilder",
"registerListener",
"PacketListenerPriority",
"META-INF/antipopup-release.properties",
"getPluginMeta",
"load",
"init",
"terminate"
]
requiredLifecycleMarkers.each { marker ->
if (!mainClassBytes.contains(marker)) {
throw new GradleException(
"Embedded PacketEvents lifecycle is missing: ${marker}")
}
}
jar.getInputStream(mainEntry).withCloseable { stream ->
DataInputStream input = new DataInputStream(stream)
input.skipNBytes(6)
int major = input.readUnsignedShort()
if (major != expectedClassMajor) {
throw new GradleException(
"Expected Java ${javaTarget} class major ${expectedClassMajor}, found ${major}")
}
}
String descriptor = jar.getInputStream(jar.getJarEntry("plugin.yml"))
.getText("UTF-8")
if (!descriptor.contains("api-version: '${expectedPaperTarget}'")
|| !descriptor.contains("version: '${releaseVersion}'")
|| !descriptor.contains("main: com.github.kaspiandev.antipopup.paper.AntiPopup")) {
throw new GradleException(
"plugin.yml is not the expected Paper ${expectedPaperTarget} descriptor")
}
["commands", "permissions", "softdepend", "depend", "loadbefore"].each { key ->
if (descriptor.readLines().any {
it == "${key}:" || it.startsWith("${key}: ")
}) {
throw new GradleException(
"Removed plugin.yml section found in deployable jar: ${key}")
}
}
def metadataEntry = jar.getJarEntry("META-INF/antipopup-release.properties")
if (metadataEntry == null) {
throw new GradleException("Generated release metadata is missing")
}
Properties embeddedReleaseFacts = new Properties()
jar.getInputStream(metadataEntry).withCloseable {
embeddedReleaseFacts.load(it)
}
releaseFacts.each { key, value ->
if (embeddedReleaseFacts.getProperty(key) != value.toString()) {
throw new GradleException(
"Embedded release metadata drift for ${key}: "
+ "${embeddedReleaseFacts.getProperty(key)} != ${value}")
}
}
def manifestAttributes = jar.manifest.mainAttributes
Map<String, String> expectedManifest = [
"Implementation-Title" : "1MB AntiPopup",
"Implementation-Version": releaseVersion,
"Artifact-Name" : expectedArchiveName,
"Built-For-Paper" : expectedPaperTarget,
"Compiled-Paper-API" : expectedPaperApi,
"Paper-Build" : expectedPaperBuild,
"Paper-Channel" : expectedPaperChannel,
"Build-Java" : javaTarget.toString()
]
expectedManifest.each { key, value ->
if (manifestAttributes.getValue(key) != value) {
throw new GradleException(
"Manifest release metadata drift for ${key}: "
+ "${manifestAttributes.getValue(key)} != ${value}")
}
}
}
}
}
def releaseDocBlocks = [
"README.md": """<!-- release-metadata:start -->
| Component | Certified release |
| --- | --- |
| Server | Paper `${expectedPaperTarget}` build `${expectedPaperBuild}` (`${expectedPaperChannel}`) |
| Paper API | `${expectedPaperApi}` |
| Java bytecode | Java `${javaTarget}` (class version `${expectedClassMajor}`) |
| Build JDK | Oracle JDK `${buildJdkVersion}` |
| Verified runtime JDKs | Oracle JDK `${runtimeJdk25Version}` and `${runtimeJdk26Version}` |
| Plugin version | `${releaseVersion}` |
| Artifact | `${expectedArchiveName}` |
<!-- release-metadata:end -->""",
"docs/installation.md": """<!-- release-metadata:start -->
| Release fact | Value |
| --- | --- |
| Plugin | `${releaseVersion}` |
| Artifact | `${expectedArchiveName}` |
| Paper runtime | `${expectedPaperTarget}` build `${expectedPaperBuild}` (`${expectedPaperChannel}`) |
| Compiled Paper API | `${expectedPaperApi}` |
| Java bytecode | `${javaTarget}` |
| Verified runtimes | Oracle JDK `${runtimeJdk25Version}` and `${runtimeJdk26Version}` |
<!-- release-metadata:end -->""",
"docs/troubleshooting.md": """<!-- release-metadata:start -->
Current release: `${releaseVersion}` in `${expectedArchiveName}`, compiled for
Paper API `${expectedPaperApi}` and Java `${javaTarget}`. Certified server:
Paper `${expectedPaperTarget}` build `${expectedPaperBuild}` (`${expectedPaperChannel}`).
<!-- release-metadata:end -->"""
]
def releaseMarkerPattern = /(?s)<!-- release-metadata:start -->.*?<!-- release-metadata:end -->/
def releaseDocFiles = releaseDocBlocks.keySet().collectEntries { path ->
[(path): layout.projectDirectory.file(path).asFile]
}
def releaseMarkdownFiles = ([
layout.projectDirectory.file("README.md").asFile
] + fileTree(layout.projectDirectory.dir("docs")) {
include "**/*.md"
}.files).sort { it.path }
def dependencyLockFile = layout.projectDirectory.file("gradle.lockfile").asFile
tasks.register("syncReleaseDocs") {
group = "documentation"
description = "Rewrites only marker-bounded current release facts from gradle.properties."
inputs.properties(releaseFacts)
inputs.files(releaseDocFiles.values())
outputs.files(releaseDocFiles.values())
doLast {
releaseDocBlocks.each { path, expectedBlock ->
File doc = releaseDocFiles[path]
String text = doc.getText("UTF-8")
if (!(text =~ releaseMarkerPattern).find()) {
throw new GradleException("Missing release metadata markers in ${path}")
}
doc.setText(
text.replaceFirst(releaseMarkerPattern, Matcher.quoteReplacement(expectedBlock)),
"UTF-8")
}
}
}
tasks.register("verifyReleaseDocs") {
group = "verification"
description = "Fails when current docs or locked Paper API drift from release properties."
inputs.properties(releaseFacts)
inputs.files(releaseMarkdownFiles)
inputs.file(dependencyLockFile)
doLast {
releaseDocBlocks.each { path, expectedBlock ->
String text = releaseDocFiles[path].getText("UTF-8")
if (!text.contains(expectedBlock)) {
throw new GradleException(
"Release documentation drift in ${path}; run ./gradlew syncReleaseDocs")
}
}
def artifactPattern = ~/1MB-AntiPopup-v\d+\.\d+\.\d+-\d{3}-j\d+-\d+\.\d+\.jar/
def paperApiPattern = ~/\d+\.\d+\.build\.\d+-(?:alpha|beta|stable)/
releaseMarkdownFiles.each { doc ->
String text = doc.getText("UTF-8")
text.findAll(artifactPattern).each { artifact ->
if (artifact != expectedArchiveName) {
throw new GradleException(
"Stale artifact example in ${doc}: ${artifact}")
}
}
text.findAll(paperApiPattern).each { api ->
if (api != expectedPaperApi) {
throw new GradleException("Stale Paper API in ${doc}: ${api}")
}
}
}
String expectedLock =
"io.papermc.paper:paper-api:${expectedPaperApi}=compileClasspath"
if (!dependencyLockFile.getText("UTF-8").contains(expectedLock)) {
throw new GradleException(
"Paper API lock drift; expected ${expectedLock}")
}
}
}
tasks.register("printReleaseMetadata") {
group = "help"
description = "Prints canonical release facts for CI and release automation."
doLast {
releaseFacts.keySet().sort().each { key ->
println("${key}=${releaseFacts[key]}")
}
}
}
def maintainedPaperJarPath = providers.gradleProperty("paperJarPath").orElse("")
tasks.register("verifyMaintainedPaperJar") {
group = "verification"
description = "Hashes a maintained Paper server JAR against the canonical release metadata."
inputs.property("paperJarPath", maintainedPaperJarPath)
inputs.property("expectedPaperJarName", expectedPaperJarName)
inputs.property("expectedPaperJarSha256", expectedPaperJarSha256)
doLast {
String configuredPath = maintainedPaperJarPath.get()
if (configuredPath.isBlank()) {
throw new GradleException(
"Pass -PpaperJarPath=/absolute/path/${expectedPaperJarName}")
}
File paperJar = new File(configuredPath)
if (!paperJar.isFile()) {
throw new GradleException("Paper JAR does not exist: ${paperJar}")
}
if (paperJar.name != expectedPaperJarName) {
throw new GradleException(
"Expected Paper JAR name ${expectedPaperJarName}, found ${paperJar.name}")
}
MessageDigest digest = MessageDigest.getInstance("SHA-256")
paperJar.withInputStream { input ->
byte[] buffer = new byte[64 * 1024]
for (int read = input.read(buffer); read != -1; read = input.read(buffer)) {
digest.update(buffer, 0, read)
}
}
String actualSha256 = HexFormat.of().formatHex(digest.digest())
if (actualSha256 != expectedPaperJarSha256) {
throw new GradleException(
"Paper JAR SHA-256 mismatch: ${actualSha256} != ${expectedPaperJarSha256}")
}
println("Verified ${paperJar}: ${actualSha256}")
}
}
check {
dependsOn tasks.named("verifyArtifact")
dependsOn tasks.named("verifyReleaseDocs")
}
dependencyLocking {
lockAllConfigurations()
}