Add matchPlayer and matchServer

api/src/main/java/com/velocitypowered/api/proxy/ProxyServer.java

@@ -76,6 +76,22 @@ public interface ProxyServer {
    */
   Collection<RegisteredServer> getAllServers();
 
+  /**
+   * Matches all {@link Player}s whose names start with the provided partial name.
+   *
+   * @param partialName the partial name to check for
+   * @return a collection of mathed {@link Player}s
+   */
+  Collection<Player> matchPlayer(String partialName);
+
+  /**
+   * Matches all {@link RegisteredServer}s whose names start with the provided partial name.
+   *
+   * @param partialName the partial name to check for
+   * @return a collection of mathed {@link RegisteredServer}s
+   */
+  Collection<RegisteredServer> matchServer(String partialName);
+
   /**
    * Registers a server with this proxy. A server with this name should not already exist.
    *

proxy/src/main/java/com/velocitypowered/proxy/VelocityServer.java

@@ -50,13 +50,16 @@ import java.nio.file.Paths;
 import java.security.KeyPair;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.UUID;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.stream.Collectors;
 import net.kyori.text.Component;
 import net.kyori.text.TextComponent;
 import net.kyori.text.serializer.GsonComponentSerializer;
@@ -442,6 +445,34 @@ public class VelocityServer implements ProxyServer {
     }
   }
 
+  @Override
+  public Collection<Player> matchPlayer(String partialName) {
+    Objects.requireNonNull(partialName);
+
+    Optional<Player> exactMatch = getPlayer(partialName);
+    if (exactMatch.isPresent()) {
+      return Collections.singleton(exactMatch.get());
+    }
+
+    return getAllPlayers().stream().filter(p -> p.getUsername()
+            .regionMatches(true, 0, partialName, 0, partialName.length()))
+            .collect(Collectors.toList());
+  }
+
+  @Override
+  public Collection<RegisteredServer> matchServer(String partialName) {
+    Objects.requireNonNull(partialName);
+
+    Optional<RegisteredServer> exactMatch = getServer(partialName);
+    if (exactMatch.isPresent()) {
+      return Collections.singleton(exactMatch.get());
+    }
+
+    return getAllServers().stream().filter(s -> s.getServerInfo().getName()
+            .regionMatches(true, 0, partialName, 0, partialName.length()))
+            .collect(Collectors.toList());
+  }
+
   @Override
   public Collection<Player> getAllPlayers() {
     return ImmutableList.copyOf(connectionsByUuid.values());