Fix parsing of placeholder status

Fixes #341

README.md

@@ -52,6 +52,15 @@ https://ci.codemc.org/job/Games647/job/FastLogin/changes
     fastlogin.command.premium.other
     fastlogin.command.cracked.other
 
+## Placeholder
+
+This plugin supports `PlaceholderAPI` on `Spigot`. It exports the following variable 
+`%fastlogin_status%`. In BungeeCord environments, the status of a player will be delivered with a delay after the player 
+already successful joined the server. This takes about a couple of milliseconds. In this case the value
+will be `Unknown`. 
+
+Possible values: `Premium`, `Cracked`, `Unknown` 
+
 ## Requirements
 
 * Plugin: 
@@ -59,7 +68,7 @@ https://ci.codemc.org/job/Games647/job/FastLogin/changes
     * [ProtocolSupport](https://www.spigotmc.org/resources/protocolsupport.7201/)
 * [Spigot](https://www.spigotmc.org) 1.8.8+
 * Java 8+
-* Run Spigot and/or BungeeCord/Waterfall in offline mode (see server.properties or config.yml)
+* Run Spigot (or a fork e.g. Paper) and/or BungeeCord (or a fork e.g. Waterfall) in offline mode
 * An auth plugin. Supported plugins
 
 ### Bukkit/Spigot/Paper

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/FastLoginBukkit.java

@@ -89,8 +89,7 @@ public class FastLoginBukkit extends JavaPlugin implements PlatformPlugin<Comman
         getCommand("cracked").setExecutor(new CrackedCommand(this));
 
         if (pluginManager.isPluginEnabled("PlaceholderAPI")) {
-            //prevents NoClassDef errors if it's not available
-            PremiumPlaceholder.register(this);
+            new PremiumPlaceholder(this).register();
         }
     }
 

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/PremiumPlaceholder.java

@@ -1,13 +1,12 @@
 package com.github.games647.fastlogin.bukkit;
 
-import me.clip.placeholderapi.PlaceholderAPI;
 import me.clip.placeholderapi.expansion.PlaceholderExpansion;
 
 import org.bukkit.entity.Player;
 
 public class PremiumPlaceholder extends PlaceholderExpansion {
 
-    private static final String PLACEHOLDER_VARIABLE = "fastlogin_status";
+    private static final String PLACEHOLDER_VARIABLE = "status";
 
     private final FastLoginBukkit plugin;
 
@@ -15,27 +14,23 @@ public class PremiumPlaceholder extends PlaceholderExpansion {
         this.plugin = plugin;
     }
 
-    public static void register(FastLoginBukkit plugin) {
-        PremiumPlaceholder placeholderHook = new PremiumPlaceholder(plugin);
-        PlaceholderAPI.registerPlaceholderHook(PLACEHOLDER_VARIABLE, placeholderHook);
-    }
-
     @Override
-    public String onPlaceholderRequest(Player player, String variable) {
-        if (player != null && PLACEHOLDER_VARIABLE.equals(variable)) {
-            return plugin.getStatus(player.getUniqueId()).name();
+    public String onPlaceholderRequest(Player player, String identifier) {
+        // player is null if offline
+        if (player != null && PLACEHOLDER_VARIABLE.equals(identifier)) {
+            return plugin.getStatus(player.getUniqueId()).getReadableName();
         }
 
-        return "";
+        return null;
     }
 
     @Override
     public String getIdentifier() {
-        return PLACEHOLDER_VARIABLE;
+        return plugin.getName();
     }
 
     @Override
-    public String getPlugin() {
+    public String getRequiredPlugin() {
         return plugin.getName();
     }
 
@@ -46,6 +41,6 @@ public class PremiumPlaceholder extends PlaceholderExpansion {
 
     @Override
     public String getVersion() {
-        return plugin.getName();
+        return plugin.getDescription().getVersion();
     }
 }

core/src/main/java/com/github/games647/fastlogin/core/PremiumStatus.java

@@ -2,9 +2,19 @@ package com.github.games647.fastlogin.core;
 
 public enum PremiumStatus {
 
-    PREMIUM,
+    PREMIUM("Premium"),
 
-    CRACKED,
+    CRACKED("Cracked"),
 
-    UNKNOWN
+    UNKNOWN("Unknown");
+
+    private final String readableName;
+
+    PremiumStatus(String readableName) {
+        this.readableName = readableName;
+    }
+
+    public String getReadableName() {
+        return readableName;
+    }
 }

core/src/main/java/com/github/games647/fastlogin/core/RateLimiter.java

@@ -18,7 +18,7 @@ public class RateLimiter {
     /**
      * Ask if access is allowed. If so register the request.
      *
-     * @return true if allowed
+     * @return true if allowed - false otherwise without any side effects
      */
     public boolean tryAcquire() {
         // current time millis is not monotonic - it can jump back depending on user choice or NTP