Added Bukkit project for Minecraft Beta 1.7.3 and split out the source tree for code sharing.

.gitattributes

@@ -0,0 +1 @@
+* text=auto

.gitignore

@@ -38,3 +38,6 @@ hs_err_*.log
 replay_*.log
 *.hprof
 *.jfr
+
+# bukkit
+craftbukkit-0.0.1-SNAPSHOT.jar

bukkit173/build.gradle

@@ -0,0 +1,38 @@
+apply plugin: 'java'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation files('craftbukkit-0.0.1-SNAPSHOT.jar')
+}
+
+tasks.withType(JavaCompile).configureEach {
+    it.options.encoding = "UTF-8"
+	it.options.release = 8
+    it.options.compilerArgs += ['-Xlint:deprecation', '-Xlint:unchecked']
+}
+
+java {
+	withSourcesJar()
+
+	sourceCompatibility = 1.8
+	targetCompatibility = 1.8
+}
+
+sourceSets {
+    main {
+        java {
+            srcDirs = [
+                '../src/shared',
+                '../src/rpc-simple',
+                '../src/bukkitb173',
+            ]
+            resources {
+                srcDirs = ['../src']
+                include 'plugin.yml'
+            }
+        }
+    }
+}

bukkit173/gradle.properties

@@ -0,0 +1,3 @@
+# Done to increase the memory available to gradle.
+org.gradle.jvmargs=-Xmx1G
+org.gradle.parallel=true

bukkit173/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

bukkit173/gradlew

@@ -0,0 +1,248 @@
+#!/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.
+#
+
+##############################################################################
+#
+#   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/subprojects/plugins/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=${0##*/}
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&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 $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        ulimit -n "$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, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$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 "$JAVACMD" "$@"

bukkit173/gradlew.bat

@@ -0,0 +1,92 @@
+@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=.
+@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.
+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% 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

fabric/build.gradle

@@ -49,7 +49,11 @@ jar {
 sourceSets {
     main {
         java {
-            srcDirs = ['../src/fabric']
+            srcDirs = [
+                '../src/shared',
+                '../src/rpc-gson',
+                '../src/fabric',
+            ]
             resources {
                 srcDirs = ['../src']
                 include 'fabric.mod.json'

fabric/gradle.properties

@@ -9,6 +9,6 @@ yarn_mappings=1.20.1+build.10
 loader_version=0.14.22
 
 # Mod Properties
-mod_version=1.0.1
+mod_version=1.1.0
 maven_group=net.flashii.mcexts
 archives_base_name=flashii-extensions

src/bukkitb173/ConfigPath.java

@@ -0,0 +1,20 @@
+package net.flashii.mcexts;
+
+import java.io.File;
+import java.nio.file.Path;
+
+public class ConfigPath {
+    private static Path configPath = null;
+
+    public static Path getPath() {
+        return configPath;
+    }
+
+    public static Path getPath(String name) {
+        return configPath.resolve(name);
+    }
+
+    public static void setPath(File path) {
+        configPath = path.toPath().toAbsolutePath();
+    }
+}

src/bukkitb173/JoinListener.java

@@ -0,0 +1,48 @@
+package net.flashii.mcexts;
+
+import org.bukkit.event.player.PlayerListener;
+import org.bukkit.event.player.PlayerLoginEvent;
+import org.bukkit.event.player.PlayerLoginEvent.Result;
+
+public class JoinListener extends PlayerListener {
+    @Override
+    public void onPlayerLogin(PlayerLoginEvent ev) {
+        if(ev.getResult() != Result.ALLOWED)
+            return;
+
+        String authText = null;
+
+        try {
+            RPCPayload payload = RPC.postAuth(ev.getPlayer().getDisplayName(), ev.getKickMessage());
+
+            if(!payload.is("auth:ok")) {
+                if(payload.is("error")) {
+                    authText = payload.getAttrStr(payload.hasAttr("text") ? "text" : "code");
+                } else if(payload.is("auth:authorise")) {
+                    String userName = payload.getAttrStr("user_name");
+                    String url = payload.getAttrStr("url");
+
+                    if(userName.length() > 20)
+                        userName = userName.substring(0, 20);
+
+                    authText = "Welcome back, " + userName + "! Go to " + url + " to verify yourself.";
+                } else if(payload.is("auth:link")) {
+                    String code = payload.getAttrStr("code");
+                    String url = payload.getAttrStr("url");
+
+                    authText = "Visit " + url + " to connect your Flashii ID. Link code: " + code;
+                } else {
+                    authText = "Flashii server returned unknown response, yell at flashwave about this.";
+                }
+            }
+        } catch(Exception ex) {
+            authText = "There was a serious problem during authentication, yell at flashwave about this.";
+            ex.printStackTrace();
+        }
+
+        if(authText == null)
+            ev.allow();
+        else
+            ev.disallow(Result.KICK_OTHER, authText);
+    }
+}

src/bukkitb173/PluginMain.java

@@ -0,0 +1,26 @@
+package net.flashii.mcexts;
+
+import java.util.logging.Logger;
+import org.bukkit.Bukkit;
+import org.bukkit.event.Event;
+import org.bukkit.event.Event.Priority;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class PluginMain extends JavaPlugin {
+    public final static Logger logger = Logger.getLogger("FIIEXTS");
+
+    private final JoinListener joinListener = new JoinListener();
+
+    @Override
+    public void onEnable() {
+        logger.info("Flashii extensions enabled!");
+
+        ConfigPath.setPath(getDataFolder());
+        Bukkit.getServer().getPluginManager().registerEvent(Event.Type.PLAYER_LOGIN, joinListener, Priority.Highest, this);
+    }
+
+    @Override
+    public void onDisable() {
+        logger.info("Flashii extensions disabled!");
+    }
+}

src/fabric/ConfigPath.java

@@ -0,0 +1,18 @@
+package net.flashii.mcexts;
+
+import java.nio.file.Path;
+import net.fabricmc.loader.api.FabricLoader;
+
+public class ConfigPath {
+    private static Path configPath = null;
+
+    public static Path getPath() {
+        if(configPath == null)
+            configPath = FabricLoader.getInstance().getGameDir().resolve("config").resolve("fiiexts");
+        return configPath;
+    }
+
+    public static Path getPath(String name) {
+        return getPath().resolve(name);
+    }
+}

src/fabric/mixin/PlayerManagerMixin.java

@@ -1,8 +1,6 @@
 package net.flashii.mcexts.mixin;
 
-import java.io.IOException;
 import java.net.SocketAddress;
-import java.security.GeneralSecurityException;
 import com.mojang.authlib.GameProfile;
 import net.flashii.mcexts.RPC;
 import net.flashii.mcexts.RPCPayload;
@@ -54,11 +52,8 @@ public abstract class PlayerManagerMixin {
                     authText = Text.literal("Flashii authentication server returned an unknown response, yell at flashwave about this.").formatted(Formatting.RED);
                 }
             }
-        } catch(IOException ex) {
-            authText = Text.literal("Flashii authentication server failed to respond, yell at flashwave about this.").formatted(Formatting.RED);
-            ex.printStackTrace();
-        } catch(GeneralSecurityException ex) {
-            authText = Text.literal("Problem with request verification, yell at flashwave about this.").formatted(Formatting.RED);
+        } catch(Exception ex) {
+            authText = Text.literal("There was a serious problem during authentication, yell at flashwave about this.").formatted(Formatting.RED);
             ex.printStackTrace();
         }
 

src/plugin.yml

@@ -0,0 +1,3 @@
+name: fiiexts
+main: net.flashii.mcexts.PluginMain
+version: 1.1.0

src/rpc-gson/RPCPayloadParser.java

@@ -0,0 +1,18 @@
+package net.flashii.mcexts;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+public class RPCPayloadParser {
+    private final Gson gson;
+
+    public RPCPayloadParser() {
+        gson = new GsonBuilder()
+            .registerTypeAdapter(RPCPayload.class, new RPCPayloadDeserialiser())
+            .create();
+    }
+
+    public RPCPayload parse(String body) {
+        return gson.fromJson(body, RPCPayload.class);
+    }
+}

src/rpc-simple/RPCPayloadParser.java

@@ -0,0 +1,31 @@
+package net.flashii.mcexts;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import org.json.simple.JSONArray;
+import org.json.simple.JSONObject;
+import org.json.simple.parser.ParseException;
+import org.json.simple.parser.JSONParser;
+
+public class RPCPayloadParser {
+    private final JSONParser parser = new JSONParser();
+
+    public RPCPayload parse(String body)
+        throws ParseException {
+        JSONObject root = (JSONObject)parser.parse(body);
+        String name = (String)root.get("name");
+        HashMap<String, Object> attrs = new HashMap<>();
+
+        @SuppressWarnings("unchecked")
+        Iterator<JSONObject> attrsIterator = ((JSONArray)root.get("attrs")).iterator();
+        while(attrsIterator.hasNext()) {
+            JSONObject attrInfo = attrsIterator.next();
+            attrs.put(
+                (String)attrInfo.get("name"),
+                attrInfo.get("value")
+            );
+        }
+
+        return new RPCPayload(name, attrs);
+    }
+}

src/shared/Config.java

@@ -3,9 +3,7 @@ package net.flashii.mcexts;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.util.HashMap;
-import net.fabricmc.loader.api.FabricLoader;
 
 public class Config {
     static class ConfigCache {
@@ -24,25 +22,14 @@ public class Config {
         }
     }
 
-    private static Path configPath = null;
     private static HashMap<String, ConfigCache> cache = new HashMap<>();
 
-    private static Path getConfigPath() {
-        if(configPath == null)
-            configPath = FabricLoader.getInstance().getGameDir().resolve("config").resolve("fiiexts");
-        return configPath;
-    }
-
-    private static Path getConfigPath(String name) {
-        return getConfigPath().resolve(name);
-    }
-
     public static String getValue(String name) {
         return getValue(name, null);
     }
 
     public static String getValue(String name, String fallback) {
-        return getFileContentsCached(getConfigPath(name), fallback);
+        return getFileContentsCached(ConfigPath.getPath(name), fallback);
     }
 
     private static String getFileContentsCached(Path path, String fallback) {
@@ -57,7 +44,7 @@ public class Config {
 
         if(output == null) {
             try {
-                output = Files.exists(path) ? Files.readString(path).trim() : fallback;
+                output = Files.exists(path) ? new String(Files.readAllBytes(path)).trim() : fallback;
             } catch(IOException ex) {
                 ex.printStackTrace();
                 output = fallback;

src/shared/RPC.java

@@ -2,8 +2,8 @@ package net.flashii.mcexts;
 
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
-import java.io.IOException;
 import java.io.OutputStream;
+import java.io.UnsupportedEncodingException;
 import java.net.HttpURLConnection;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
@@ -11,25 +11,20 @@ import java.net.SocketAddress;
 import java.net.URL;
 import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
-import java.security.GeneralSecurityException;
 import java.util.Base64;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.UUID;
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
 
 public class RPC {
     private static final String DEFAULT_SECRET = "meow";
 
-    private static Gson gson = null;
+    private static RPCPayloadParser parser = null;
 
-    public static Gson getGson() {
-        if(gson == null)
-            gson = new GsonBuilder()
-                .registerTypeAdapter(RPCPayload.class, new RPCPayloadDeserialiser())
-                .create();
-        return gson;
+    public static RPCPayloadParser getParser() {
+        if(parser == null)
+            parser = new RPCPayloadParser();
+        return parser;
     }
 
     public static String getSecretKey() {
@@ -46,7 +41,9 @@ public class RPC {
         params.forEach((key, value) -> {
             sb.append(key);
             sb.append('=');
-            sb.append(URLEncoder.encode(value.toString(), StandardCharsets.UTF_8));
+            try {
+                sb.append(URLEncoder.encode(value.toString(), "UTF-8"));
+            } catch(UnsupportedEncodingException ex) {}
             sb.append('&');
         });
 
@@ -59,7 +56,7 @@ public class RPC {
     }
 
     public static String createRequestSignature(String time, String path, String params)
-        throws GeneralSecurityException {
+        throws Exception {
         return Base64.getEncoder().encodeToString(HMAC.calculate(
             HMAC.SHA256, getSecretKey(), String.format("%s#%s?%s", time, path, params)
         ));
@@ -67,7 +64,7 @@ public class RPC {
 
     // sigStr and bodyStr because sigStr must also include the query params if those are present
     public static RPCPayload callRpc(String path, String sigStr, String bodyStr)
-        throws GeneralSecurityException, IOException {
+        throws Exception {
         boolean hasBody = bodyStr != null;
         String time = getRequestTimestamp();
         String hash = createRequestSignature(time, URLs.getRpcPath(path), sigStr);
@@ -94,31 +91,48 @@ public class RPC {
                 sb.append(line);
         }
 
-        return getGson().fromJson(sb.toString(), RPCPayload.class);
+        return getParser().parse(sb.toString());
     }
 
     public static RPCPayload callRpc(String path, String paramStr)
-        throws GeneralSecurityException, IOException {
+        throws Exception {
         return callRpc(path, paramStr, paramStr);
     }
 
     public static RPCPayload callRpc(String path, Map<String, Object> params)
-        throws GeneralSecurityException, IOException {
+        throws Exception {
         return callRpc(path, createParamString(params));
     }
 
-    public static RPCPayload postAuth(UUID id, String name, InetAddress remoteAddr)
-        throws GeneralSecurityException, IOException {
+    public static UUID createOfflinePlayerUUID(String name) {
+        return UUID.nameUUIDFromBytes(("OfflinePlayer:" + name).getBytes());
+    }
+
+    public static RPCPayload postAuth(String name, String remoteAddr)
+        throws Exception {
+        return postAuth(
+            createOfflinePlayerUUID(name),
+            name, remoteAddr
+        );
+    }
+
+    public static RPCPayload postAuth(UUID id, String name, String remoteAddr)
+        throws Exception {
         HashMap<String, Object> params = new HashMap<>();
         params.put("id", id);
         params.put("name", name);
-        params.put("ip", remoteAddr.getHostAddress());
+        params.put("ip", remoteAddr);
 
         return callRpc("/auth", params);
     }
 
+    public static RPCPayload postAuth(UUID id, String name, InetAddress remoteAddr)
+        throws Exception {
+        return postAuth(id, name, remoteAddr.getHostAddress());
+    }
+
     public static RPCPayload postAuth(UUID id, String name, SocketAddress sockAddr)
-        throws GeneralSecurityException, IOException {
+        throws Exception {
         InetAddress remoteAddr = sockAddr instanceof InetSocketAddress
             ? ((InetSocketAddress)sockAddr).getAddress()
             : InetAddress.getLoopbackAddress();