Add plugin description

api/src/ap/java/com/velocitypowered/api/plugin/ap/SerializedPluginDescription.java

@@ -16,15 +16,18 @@ public class SerializedPluginDescription {
     private final String id;
     private final @Nullable String name;
     private final @Nullable String version;
+    private final @Nullable String description;
     private final @Nullable String url;
     private final @Nullable List<String> authors;
     private final @Nullable List<Dependency> dependencies;
     private final String main;
 
-    public SerializedPluginDescription(String id, String name, String version, String url, List<String> authors, List<Dependency> dependencies, String main) {
+    public SerializedPluginDescription(String id, String name, String version, String description, String url,
+            List<String> authors, List<Dependency> dependencies, String main) {
         this.id = Preconditions.checkNotNull(id, "id");
         this.name = Strings.emptyToNull(name);
         this.version = Strings.emptyToNull(version);
+        this.description = Strings.emptyToNull(description);
         this.url = Strings.emptyToNull(url);
         this.authors = authors == null || authors.isEmpty() ? null : authors;
         this.dependencies = dependencies == null || dependencies.isEmpty() ? null : dependencies;
@@ -36,7 +39,7 @@ public class SerializedPluginDescription {
         for (com.velocitypowered.api.plugin.Dependency dependency : plugin.dependencies()) {
             dependencies.add(new Dependency(dependency.id(), dependency.optional()));
         }
-        return new SerializedPluginDescription(plugin.id(), plugin.name(), plugin.version(), plugin.url(),
+        return new SerializedPluginDescription(plugin.id(), plugin.name(), plugin.version(), plugin.description(), plugin.url(),
                 Arrays.stream(plugin.authors()).filter(author -> !author.isEmpty()).collect(Collectors.toList()), dependencies, qualifiedName);
     }
 
@@ -52,6 +55,10 @@ public class SerializedPluginDescription {
         return version;
     }
 
+    public @Nullable String getDescription() {
+        return description;
+    }
+
     public @Nullable String getUrl() {
         return url;
     }
@@ -76,6 +83,7 @@ public class SerializedPluginDescription {
         return Objects.equals(id, that.id) &&
                 Objects.equals(name, that.name) &&
                 Objects.equals(version, that.version) &&
+                Objects.equals(description, that.description) &&
                 Objects.equals(url, that.url) &&
                 Objects.equals(authors, that.authors) &&
                 Objects.equals(dependencies, that.dependencies) &&
@@ -84,14 +92,16 @@ public class SerializedPluginDescription {
 
     @Override
     public int hashCode() {
-        return Objects.hash(id, name, version, url, authors, dependencies);
+        return Objects.hash(id, name, version, description, url, authors, dependencies);
     }
 
-    @Override public String toString() {
+    @Override
+    public String toString() {
         return "SerializedPluginDescription{" +
                 "id='" + id + '\'' +
                 ", name='" + name + '\'' +
                 ", version='" + version + '\'' +
+                ", description='" + description + '\'' +
                 ", url='" + url + '\'' +
                 ", authors=" + authors +
                 ", dependencies=" + dependencies +

api/src/main/java/com/velocitypowered/api/plugin/Plugin.java

@@ -36,6 +36,13 @@ public @interface Plugin {
      */
     String version() default "";
 
+    /**
+     * The description of the plugin, explaining what it can be used for.
+     *
+     * @return The plugin description, or an empty string if unknown
+     */
+    String description() default "";
+
     /**
      * The URL or website of the plugin.
      *

api/src/main/java/com/velocitypowered/api/plugin/PluginDescription.java

@@ -49,6 +49,16 @@ public interface PluginDescription {
         return Optional.empty();
     }
 
+    /**
+     * Gets the description of the {@link Plugin} within this container.
+     *
+     * @return an {@link Optional} with the plugin description, may be empty
+     * @see Plugin#description()
+     */
+    default Optional<String> getDescription() {
+        return Optional.empty();
+    }
+
     /**
      * Gets the url or website of the {@link Plugin} within this container.
      *

proxy/src/main/java/com/velocitypowered/proxy/plugin/loader/JavaPluginLoader.java

@@ -108,6 +108,7 @@ public class JavaPluginLoader implements PluginLoader {
                 description.getId(),
                 description.getName(),
                 description.getVersion(),
+                description.getDescription(),
                 description.getUrl(),
                 description.getAuthors(),
                 dependencies,

proxy/src/main/java/com/velocitypowered/proxy/plugin/loader/VelocityPluginDescription.java

@@ -19,16 +19,18 @@ public class VelocityPluginDescription implements PluginDescription {
     private final String id;
     private final @Nullable String name;
     private final @Nullable String version;
+    private final @Nullable String description;
     private final @Nullable String url;
     private final List<String> authors;
     private final Map<String, PluginDependency> dependencies;
     private final Path source;
 
-    public VelocityPluginDescription(String id, @Nullable String name, @Nullable String version, @Nullable String url,
+    public VelocityPluginDescription(String id, @Nullable String name, @Nullable String version, @Nullable String description, @Nullable String url,
             @Nullable List<String> authors, Collection<PluginDependency> dependencies, Path source) {
         this.id = checkNotNull(id, "id");
         this.name = Strings.emptyToNull(name);
         this.version = Strings.emptyToNull(version);
+        this.description = Strings.emptyToNull(description);
         this.url = Strings.emptyToNull(url);
         this.authors = authors == null ? ImmutableList.of() : ImmutableList.copyOf(authors);
         this.dependencies = Maps.uniqueIndex(dependencies, PluginDependency::getId);
@@ -50,6 +52,11 @@ public class VelocityPluginDescription implements PluginDescription {
         return Optional.ofNullable(version);
     }
 
+    @Override
+    public Optional<String> getDescription() {
+        return Optional.ofNullable(description);
+    }
+
     @Override
     public Optional<String> getUrl() {
         return Optional.ofNullable(url);
@@ -79,8 +86,11 @@ public class VelocityPluginDescription implements PluginDescription {
     public String toString() {
         return "VelocityPluginDescription{" +
                 "id='" + id + '\'' +
+                ", name='" + name + '\'' +
                 ", version='" + version + '\'' +
-                ", authors='" + authors + '\'' +
+                ", description='" + description + '\'' +
+                ", url='" + url + '\'' +
+                ", authors=" + authors +
                 ", dependencies=" + dependencies +
                 ", source=" + source +
                 '}';

proxy/src/main/java/com/velocitypowered/proxy/plugin/loader/java/JavaVelocityPluginDescription.java

@@ -2,6 +2,7 @@ package com.velocitypowered.proxy.plugin.loader.java;
 
 import com.velocitypowered.api.plugin.meta.PluginDependency;
 import com.velocitypowered.proxy.plugin.loader.VelocityPluginDescription;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 import java.nio.file.Path;
 import java.util.Collection;
@@ -12,9 +13,9 @@ import static com.google.common.base.Preconditions.checkNotNull;
 public class JavaVelocityPluginDescription extends VelocityPluginDescription {
     private final Class<?> mainClass;
 
-    public JavaVelocityPluginDescription(String id, String name, String version, String url, List<String> authors,
-            Collection<PluginDependency> dependencies, Path source, Class<?> mainClass) {
-        super(id, name, version, url, authors, dependencies, source);
+    public JavaVelocityPluginDescription(String id, @Nullable String name, @Nullable String version, @Nullable String description, @Nullable String url,
+            @Nullable List<String> authors, Collection<PluginDependency> dependencies, Path source, Class<?> mainClass) {
+        super(id, name, version, description, url, authors, dependencies, source);
         this.mainClass = checkNotNull(mainClass);
     }
 

proxy/src/main/java/com/velocitypowered/proxy/plugin/loader/java/SerializedPluginDescription.java

@@ -16,15 +16,18 @@ public class SerializedPluginDescription {
     private final String id;
     private final @Nullable String name;
     private final @Nullable String version;
+    private final @Nullable String description;
     private final @Nullable String url;
     private final @Nullable List<String> authors;
     private final @Nullable List<Dependency> dependencies;
     private final String main;
 
-    public SerializedPluginDescription(String id, String name, String version, String url, List<String> authors, List<Dependency> dependencies, String main) {
+    public SerializedPluginDescription(String id, String name, String version, String description, String url,
+            List<String> authors, List<Dependency> dependencies, String main) {
         this.id = Preconditions.checkNotNull(id, "id");
         this.name = Strings.emptyToNull(name);
         this.version = Strings.emptyToNull(version);
+        this.description = Strings.emptyToNull(description);
         this.url = Strings.emptyToNull(url);
         this.authors = authors == null || authors.isEmpty() ? null : authors;
         this.dependencies = dependencies == null || dependencies.isEmpty() ? null : dependencies;
@@ -36,7 +39,7 @@ public class SerializedPluginDescription {
         for (com.velocitypowered.api.plugin.Dependency dependency : plugin.dependencies()) {
             dependencies.add(new Dependency(dependency.id(), dependency.optional()));
         }
-        return new SerializedPluginDescription(plugin.id(), plugin.name(), plugin.version(), plugin.url(),
+        return new SerializedPluginDescription(plugin.id(), plugin.name(), plugin.version(), plugin.description(), plugin.url(),
                 Arrays.stream(plugin.authors()).filter(author -> !author.isEmpty()).collect(Collectors.toList()), dependencies, qualifiedName);
     }
 
@@ -52,6 +55,10 @@ public class SerializedPluginDescription {
         return version;
     }
 
+    public @Nullable String getDescription() {
+        return description;
+    }
+
     public @Nullable String getUrl() {
         return url;
     }
@@ -76,6 +83,7 @@ public class SerializedPluginDescription {
         return Objects.equals(id, that.id) &&
                 Objects.equals(name, that.name) &&
                 Objects.equals(version, that.version) &&
+                Objects.equals(description, that.description) &&
                 Objects.equals(url, that.url) &&
                 Objects.equals(authors, that.authors) &&
                 Objects.equals(dependencies, that.dependencies) &&
@@ -84,14 +92,16 @@ public class SerializedPluginDescription {
 
     @Override
     public int hashCode() {
-        return Objects.hash(id, name, version, url, authors, dependencies);
+        return Objects.hash(id, name, version, description, url, authors, dependencies);
     }
 
-    @Override public String toString() {
+    @Override
+    public String toString() {
         return "SerializedPluginDescription{" +
                 "id='" + id + '\'' +
                 ", name='" + name + '\'' +
                 ", version='" + version + '\'' +
+                ", description='" + description + '\'' +
                 ", url='" + url + '\'' +
                 ", authors=" + authors +
                 ", dependencies=" + dependencies +