init

.gitignore

@@ -0,0 +1,3 @@
+build
+.gradle
+gradle

build.gradle

@@ -0,0 +1,25 @@
+plugins {
+    id 'java'
+}
+
+repositories {
+    mavenCentral()
+    maven {
+        name = 'papermc'
+        url = 'https://repo.papermc.io/repository/maven-public/'
+    }
+}
+
+dependencies {
+    compileOnly "io.papermc.paper:paper-api:1.21-R0.1-SNAPSHOT"
+}
+
+def targetJavaVersion = 21
+java {
+    def javaVersion = JavaVersion.toVersion(targetJavaVersion)
+    sourceCompatibility = javaVersion
+    targetCompatibility = javaVersion
+    if (JavaVersion.current() < javaVersion) {
+        toolchain.languageVersion = JavaLanguageVersion.of(targetJavaVersion)
+    }
+}

gradlew

@@ -0,0 +1,252 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# 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: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# 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"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,94 @@
+@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
+@rem SPDX-License-Identifier: Apache-2.0
+@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=.
+@rem This is normally unused
+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% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+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% equ 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!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'cloudflare-tunnels-plugin'

src/main/java/dev/ivycollective/cloudflaretunnelsplugin/CloudflareTunnelsPlugin.java

@@ -0,0 +1,199 @@
+package dev.ivycollective.cloudflaretunnelsplugin;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URL;
+import java.nio.channels.Channels;
+import java.nio.channels.ReadableByteChannel;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Server;
+import org.bukkit.event.Listener;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import net.kyori.adventure.text.Component;
+
+public class CloudflareTunnelsPlugin extends JavaPlugin implements Listener {
+    private boolean shouldRun = false;
+    private boolean isBrokenState = false;
+
+    /**
+     * Spawns a process on the host machine
+     */
+    private Process exec(String[] cmdline) {
+        try {
+            return Runtime.getRuntime().exec(cmdline);
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    /**
+     * Get the cached cloudflared binary folder
+     */
+    private File getCacheDir() {
+        File file = new File("cloudflared-cache");
+        if (!file.exists()) {
+            file.mkdirs();
+        }
+        if (!file.isDirectory()) {
+            throw new RuntimeException("cloudflared-cache is not a directory");
+        }
+        return file;
+    }
+
+    /**
+     * Get the executable cloudflared file.
+     */
+    private File getOrMakeCloudflaredExecutable(Configuration config) {
+        File file = new File(getCacheDir(), "cloudflared-" + config.version);
+        if (file.exists() && file.isFile()) {
+            return file;
+        } else if (file.exists() && file.isDirectory()) {
+            throw new RuntimeException("cloudflared-" + config.version + " is a directory");
+        }
+        boolean res = downloadFile(config.downloadUrlTemplate.replace("VERSION", config.version), file);
+        if (!res || !file.exists() || !file.isFile()) {
+            throw new RuntimeException("Failed to download cloudflared-" + config.version);
+        }
+        if (!file.setExecutable(true)) {
+            throw new RuntimeException("Failed to make cloudflared-" + config.version + " executable");
+        }
+        return file;
+    }
+
+    /**
+     * Download a file from a url
+     */
+    private boolean downloadFile(String urlString, File where) {
+        System.out.println("Downloading cloudflared, please wait (from " + urlString + ")");
+        URL url;
+        try {
+            url = URI.create(urlString).toURL();
+        } catch (MalformedURLException e) {
+            throw new RuntimeException(e);
+        }
+        try (
+            ReadableByteChannel bytes = Channels.newChannel(url.openStream());
+            FileOutputStream outputStream = new FileOutputStream(where);
+        ) {
+            outputStream.getChannel().transferFrom(bytes, 0, Long.MAX_VALUE);
+            System.out.println("Downloaded cloudflared");
+            return true;
+        } catch (IOException e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+    private Process spawnCloudflared(Configuration config) {
+        File cloudflared = getOrMakeCloudflaredExecutable(config);
+        ArrayList<String> args = new ArrayList<>(List.of(new String[] {
+            cloudflared.getPath(),
+            "tunnel",
+            "--loglevel", config.logLevel,
+            "--logfile", new File("cloudflared.log").getPath(), 
+            "--no-autoupdate",
+            "run",
+            "--token", config.token }));
+        if (config.disableCertCheck) {
+            args.add("--no-tls-verify");
+        }
+        return exec(args.toArray(String[]::new));
+    }
+
+    /**
+     * Start cloudflared when the server starts
+     */
+    @Override
+    public void onEnable() {
+        if (isBrokenState || shouldRun) {
+            throw new RuntimeException("Please restart the server, broken state detected.");
+        }
+        saveDefaultConfig();
+        if (!getConfig().getBoolean("installed")) {
+            throw new RuntimeException("Please configure this plugin and set 'installed: true' before starting the server");
+        }
+        Configuration config = new Configuration(
+            getConfig().getString("download.url"),
+            getConfig().getString("download.version"),
+            getConfig().getString("token"),
+            getConfig().getBoolean("restart.auto-restart"),
+            getConfig().getInt("restart.interval-seconds"),
+            getConfig().getBoolean("notify-ops-on-exit"),
+            getConfig().getString("log-level"),
+            getConfig().getBoolean("disable-tls")
+        );
+
+        shouldRun = true;
+        cloudflaredLoop(config);
+    }
+
+    private void cloudflaredLoop(Configuration config) {
+        System.out.println("Spawning cloudflared...");
+        final Process process = spawnCloudflared(config);
+        
+        process.onExit().thenRun(() -> {
+            System.out.println("Cloudflared exiting with code " + process.exitValue());
+            if (!shouldRun) {
+                return;
+            }
+            if (config.autoRestart) {
+                if (config.notifyOps) {
+                    Bukkit.broadcast(Component.text("Cloudflared died, restarting..."), Server.BROADCAST_CHANNEL_ADMINISTRATIVE);
+                }
+                if (config.restartInterval > 0) {
+                    System.out.println("Restarting automatically in " + config.restartInterval + " seconds");
+                    Bukkit.getScheduler().runTaskLater(this, () -> cloudflaredLoop(config), config.restartInterval * 20L);
+                } else {
+                    System.out.println("Restarting automatically now");
+                    cloudflaredLoop(config);
+                }
+            } else {
+                System.out.println("Not restarting automatically (feature disabled)");
+                if (config.notifyOps) {
+                    Bukkit.broadcast(Component.text("Cloudflared died. Not restarting."), Server.BROADCAST_CHANNEL_ADMINISTRATIVE);
+                }
+            }
+        });
+    }
+
+    /**
+     * Stop cloudflared when the server stops
+     */
+    @Override
+    public void onDisable() {
+        shouldRun = false;
+        Process process = exec(new String[] { "pkill", "cloudflared" });
+        int result;
+        try {
+            result = process.waitFor();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+            result = 1;
+        }
+        if (result != 0) {
+            isBrokenState = true;
+            throw new RuntimeException("Failed to stop cloudflared");
+        } else {
+            System.out.println("Stopped cloudflared");
+        }
+    }
+
+    private record Configuration(
+        String downloadUrlTemplate,
+        String version,
+        String token,
+        boolean autoRestart,
+        int restartInterval,
+        boolean notifyOps,
+        String logLevel,
+        boolean disableCertCheck
+    ) {}
+}

src/main/resources/config.yml

@@ -0,0 +1,14 @@
+download:
+  url: "https://github.com/cloudflare/cloudflared/releases/download/VERSION/cloudflared-linux-amd64"
+  version: "2024.12.1"
+
+token: AAAAAAAAAAAA
+notify-ops-on-exit: true
+log-level: info
+disable-tls: true
+
+restart:
+  auto-restart: true
+  interval-seconds: 30
+
+installed: false

src/main/resources/plugin.yml

@@ -0,0 +1,5 @@
+name: cloudflare-tunnels-plugin
+version: STAGING
+main: dev.ivycollective.cloudflaretunnelsplugin.CloudflareTunnelsPlugin
+description: Run a Cloudflare Tunnels daemon
+authors: [ ivycollective ]