Removed some debug code. Allow database impls to handle link requests

api/src/main/java/org/geysermc/floodgate/api/link/LinkRequestResult.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2019-2021 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Floodgate
+ */
+
+package org.geysermc.floodgate.api.link;
+
+/**
+ * This enum has all the available result types of both creating a player link request and
+ * validating it.
+ */
+public enum LinkRequestResult {
+    /**
+     * An unknown error encountered while creating / verifying the link request.
+     */
+    UNKNOWN_ERROR,
+    /**
+     * @deprecated this result isn't used. Instead the link code is returned
+     */
+    REQUEST_CREATED,
+    /**
+     * The specified bedrock username is already linked to a Java account.
+     */
+    ALREADY_LINKED,
+    /**
+     * The Bedrock player verified the request too late. The request has been expired.
+     */
+    REQUEST_EXPIRED,
+    /**
+     * The Java player hasn't requested a link to this Bedrock account.
+     */
+    NO_LINK_REQUESTED,
+    /**
+     * The entered code is invalid.
+     */
+    INVALID_CODE,
+    /**
+     * The link request has been verified successfully!
+     */
+    LINK_COMPLETED
+}

api/src/main/java/org/geysermc/floodgate/api/link/PlayerLink.java

@@ -54,10 +54,10 @@ public interface PlayerLink {
     /**
      * Tells if the given player is a linked player
      *
-     * @param bedrockId the bedrock uuid of the linked player
+     * @param playerId the uuid of the player to check, can be both a Java or a Bedrock uuid
      * @return true if the player is a linked player
      */
-    CompletableFuture<Boolean> isLinkedPlayer(UUID bedrockId);
+    CompletableFuture<Boolean> isLinkedPlayer(UUID playerId);
 
     /**
      * Links a Java account to a Bedrock account.
@@ -77,6 +77,37 @@ public interface PlayerLink {
      */
     CompletableFuture<Void> unlinkPlayer(UUID javaId);
 
+    /**
+     * Creates a link request for the given Java player.
+     *
+     * @param javaId          the uuid of the Java player
+     * @param javaUsername    the username of the Java player
+     * @param bedrockUsername the username of the Bedrock player receiving the link request
+     * @return a future holding the result of the link request which will be a {@link
+     * LinkRequestResult} on failure and the link code (string) on success
+     */
+    CompletableFuture<?> createLinkRequest(
+            UUID javaId,
+            String javaUsername,
+            String bedrockUsername
+    );
+
+    /**
+     * Verifies a link request for the given Bedrock player.
+     *
+     * @param bedrockId       the uuid of the Bedrock player
+     * @param javaUsername    the username of the Java players who requested the link
+     * @param bedrockUsername the username of the Bedrock player
+     * @param code            the code created in {@link #createLinkRequest(UUID, String, String)}
+     * @return a future holding the result of the link verification
+     */
+    CompletableFuture<LinkRequestResult> verifyLinkRequest(
+            UUID bedrockId,
+            String javaUsername,
+            String bedrockUsername,
+            String code
+    );
+
     /**
      * Return if account linking is enabled. The difference between enabled and allowed is that
      * 'enabled' still allows already linked people to join with their linked account while 'allow