Add form API and other small changes

api/pom.xml

@@ -16,5 +16,11 @@
             <version>1.18.4</version>
             <scope>compile</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.8.2</version>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
 </project>

api/src/main/java/org/geysermc/api/Player.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api;
+
+import org.geysermc.api.command.CommandSender;
+import org.geysermc.api.session.AuthData;
+import org.geysermc.api.window.FormWindow;
+
+public interface Player extends CommandSender {
+
+    /**
+     * Connects the player to the remote server
+     *
+     * @param remoteServer the remote server to connect to
+     */
+    void connect(RemoteServer remoteServer);
+
+    /**
+     * Disconnect the player for the specified reason
+     *
+     * @param reason the reason to disconnect the player for
+     */
+    void disconnect(String reason);
+
+    /**
+     * Returns the authentication data of the player. This is not the
+     * player's Minecraft credentials; it's simply what is given to the server
+     * (Name, UUID, Xbox UUID) to verify the player can/actually exists.
+     *
+     * @return the authentication data of the player
+     */
+    AuthData getAuthenticationData();
+
+    /**
+     * Sends a form window
+     *
+     * @param window the window form to send
+     */
+    void sendForm(FormWindow window);
+
+    /**
+     * Sends a form window with the given ID
+     *
+     * @param window the window to send
+     * @param id the id of the window
+     */
+    void sendForm(FormWindow window, int id);
+}

api/src/main/java/org/geysermc/api/RemoteServer.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api;
+
+public interface RemoteServer {
+
+    /**
+     * Returns the IP address of the remote server
+     *
+     * @return the IP address of the remote server
+     */
+    String getAddress();
+
+    /**
+     * Returns the port of the remote server
+     *
+     * @return the port of the remote server
+     */
+    int getPort();
+}

api/src/main/java/org/geysermc/api/events/EventHandler.java

@@ -1,3 +1,28 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
 package org.geysermc.api.events;
 
 import java.lang.annotation.ElementType;
@@ -8,7 +33,6 @@ import java.lang.annotation.Target;
 /**
  * The annotation to put on all methods that are events.
  */
-
 @Target(ElementType.METHOD)
 @Retention(RetentionPolicy.RUNTIME)
 public @interface EventHandler {

api/src/main/java/org/geysermc/api/events/Listener.java

@@ -1,3 +1,28 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
 package org.geysermc.api.events;
 
 /**

api/src/main/java/org/geysermc/api/events/PingEvent.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.events;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.net.InetSocketAddress;
+
+@Getter
+@Setter
+public class PingEvent {
+
+    public PingEvent(InetSocketAddress address) {
+        this.address = address;
+    }
+
+    private InetSocketAddress address;
+
+    private String edition;
+    private String motd;
+    private int protocolVersion;
+    private String version;
+    private int playerCount;
+    private int maximumPlayerCount;
+    private long serverId;
+    private String subMotd;
+    private String gameType;
+    private boolean nintendoLimited;
+}

api/src/main/java/org/geysermc/api/events/player/PingEvent.java

@@ -1,29 +0,0 @@
-package org.geysermc.api.events.player;
-
-import lombok.AccessLevel;
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-import lombok.Setter;
-
-import java.net.InetSocketAddress;
-
-@Getter
-@Setter
-public class PingEvent {
-    public PingEvent(InetSocketAddress address) {
-        this.address = address;
-    }
-
-    private InetSocketAddress address;
-
-    private String edition;
-    private String motd;
-    private int protocolVersion;
-    private String version;
-    private int playerCount;
-    private int maximumPlayerCount;
-    private long serverId;
-    private String subMotd;
-    private String gameType;
-    private boolean nintendoLimited;
-}

api/src/main/java/org/geysermc/api/events/player/PlayerEvent.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.events.player;
+
+import lombok.Getter;
+import org.geysermc.api.Player;
+
+public class PlayerEvent {
+
+    @Getter
+    private Player player;
+
+    public PlayerEvent(Player player) {
+        this.player = player;
+    }
+}

api/src/main/java/org/geysermc/api/events/player/PlayerFormResponseEvent.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.events.player;
+
+import lombok.Getter;
+import org.geysermc.api.Player;
+import org.geysermc.api.window.FormWindow;
+import org.geysermc.api.window.response.FormResponse;
+
+/**
+ * Called when a player interacts with a form
+ */
+public class PlayerFormResponseEvent extends PlayerEvent {
+
+    @Getter
+    private int formID;
+
+    @Getter
+    private FormWindow window;
+
+    /**
+     * Constructs a new PlayerFormResponseEvent instance
+     *
+     * @param player the player interacting with the form
+     * @param formID the id of the form
+     * @param window the window
+     */
+    public PlayerFormResponseEvent(Player player, int formID, FormWindow window) {
+        super(player);
+
+        this.formID = formID;
+        this.window = window;
+    }
+
+    /**
+     * Returns the response of the window, can be null
+     * if the player closed the window
+     *
+     * @return the response of the window
+     */
+    public FormResponse getResponse() {
+        return window.getResponse();
+    }
+
+    /**
+     * Returns if the window is closed
+     *
+     * @return if the window is closed
+     */
+    public boolean isClosed() {
+        return window.isClosed();
+    }
+}

api/src/main/java/org/geysermc/api/plugin/Plugin.java

@@ -36,6 +36,11 @@ public class Plugin {
     protected String name;
     protected String version;
 
+    /**
+     * Returns if the plugin is enabled
+     *
+     * @return if the plugin is enabled
+     */
     @Getter
     @Setter
     private boolean enabled = true;

api/src/main/java/org/geysermc/api/session/AuthData.java

@@ -1,9 +1,36 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
 package org.geysermc.api.session;
 
+import java.util.UUID;
+
 public interface AuthData {
-    void getXUID();
 
-    void getUUID();
+    String getName();
 
-    void getName();
+    UUID getUUID();
+    String getXboxUUID();
 }

api/src/main/java/org/geysermc/api/window/CustomFormBuilder.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window;
+
+import lombok.Getter;
+import org.geysermc.api.window.button.FormImage;
+import org.geysermc.api.window.component.FormComponent;
+import org.geysermc.api.window.response.CustomFormResponse;
+
+public class CustomFormBuilder {
+
+    @Getter
+    private CustomFormWindow form;
+
+    public CustomFormBuilder(String title) {
+        form = new CustomFormWindow(title);
+    }
+
+    public CustomFormBuilder setTitle(String title) {
+        form.setTitle(title);
+        return this;
+    }
+
+    public CustomFormBuilder setIcon(FormImage icon) {
+        form.setIcon(icon);
+        return this;
+    }
+
+    public CustomFormBuilder setResponse(String data) {
+        form.setResponse(data);
+        return this;
+    }
+
+    public CustomFormBuilder setResponse(CustomFormResponse response) {
+        form.setResponse(response);
+        return this;
+    }
+
+    public CustomFormBuilder addComponent(FormComponent component) {
+        form.addComponent(component);
+        return this;
+    }
+
+    public CustomFormWindow build() {
+        return form;
+    }
+}

api/src/main/java/org/geysermc/api/window/CustomFormWindow.java

@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window;
+
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+import lombok.Getter;
+import lombok.Setter;
+import org.geysermc.api.window.button.FormImage;
+import org.geysermc.api.window.component.DropdownComponent;
+import org.geysermc.api.window.component.FormComponent;
+import org.geysermc.api.window.component.InputComponent;
+import org.geysermc.api.window.component.LabelComponent;
+import org.geysermc.api.window.component.SliderComponent;
+import org.geysermc.api.window.component.StepSliderComponent;
+import org.geysermc.api.window.component.ToggleComponent;
+import org.geysermc.api.window.response.CustomFormResponse;
+import org.geysermc.api.window.response.FormResponseData;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class CustomFormWindow extends FormWindow {
+
+    @Getter
+    @Setter
+    private String title;
+
+    @Getter
+    @Setter
+    private FormImage icon;
+
+    @Getter
+    private List<FormComponent> content;
+
+    public CustomFormWindow(String title) {
+        this(title, new ArrayList<>());
+    }
+
+    public CustomFormWindow(String title, List<FormComponent> content) {
+        this(title, content, (FormImage) null);
+    }
+
+    public CustomFormWindow(String title, List<FormComponent> content, String icon) {
+        this(title, content, new FormImage(FormImage.FormImageType.URL, icon));
+    }
+
+    public CustomFormWindow(String title, List<FormComponent> content, FormImage icon) {
+        super("custom_form");
+
+        this.title = title;
+        this.content = content;
+        this.icon = icon;
+    }
+
+    public void addComponent(FormComponent component) {
+        content.add(component);
+    }
+
+    public String getJSONData() {
+        String toModify = new Gson().toJson(this);
+        //We need to replace this due to Java not supporting declaring class field 'default'
+        return toModify.replace("defaultOptionIndex", "default")
+                .replace("defaultText", "default")
+                .replace("defaultValue", "default")
+                .replace("defaultStepIndex", "default");
+    }
+
+    public void setResponse(String data) {
+        if (data == null || data.equalsIgnoreCase("null")) {
+            closed = true;
+            return;
+        }
+
+        int i = 0;
+        Map<Integer, FormResponseData> dropdownResponses = new HashMap<Integer, FormResponseData>();
+        Map<Integer, String> inputResponses = new HashMap<Integer, String>();
+        Map<Integer, Float> sliderResponses = new HashMap<Integer, Float>();
+        Map<Integer, FormResponseData> stepSliderResponses = new HashMap<Integer, FormResponseData>();
+        Map<Integer, Boolean> toggleResponses = new HashMap<Integer, Boolean>();
+        Map<Integer, Object> responses = new HashMap<Integer, Object>();
+        Map<Integer, String> labelResponses = new HashMap<Integer, String>();
+
+        List<String> componentResponses = new Gson().fromJson(data, new TypeToken<List<String>>() { }.getType());
+        for (String response : componentResponses) {
+            if (i >= content.size()) {
+                break;
+            }
+
+            FormComponent component = content.get(i);
+            if (component == null)
+                return;
+
+            if (component instanceof LabelComponent) {
+                LabelComponent labelComponent = (LabelComponent) component;
+                labelResponses.put(i, labelComponent.getText());
+            }
+
+            if (component instanceof DropdownComponent) {
+                DropdownComponent dropdownComponent = (DropdownComponent) component;
+                String option = dropdownComponent.getOptions().get(Integer.parseInt(response));
+
+                dropdownResponses.put(i, new FormResponseData(Integer.parseInt(response), option));
+                responses.put(i, option);
+            }
+
+            if (component instanceof InputComponent) {
+                inputResponses.put(i, response);
+                responses.put(i, response);
+            }
+
+            if (component instanceof SliderComponent) {
+                float value = Float.parseFloat(response);
+                sliderResponses.put(i, value);
+                responses.put(i, value);
+            }
+
+            if (component instanceof StepSliderComponent) {
+                StepSliderComponent stepSliderComponent = (StepSliderComponent) component;
+                String step = stepSliderComponent.getSteps().get(Integer.parseInt(response));
+                stepSliderResponses.put(i, new FormResponseData(Integer.parseInt(response), step));
+                responses.put(i, step);
+            }
+
+            if (component instanceof ToggleComponent) {
+                boolean answer = Boolean.parseBoolean(response);
+                toggleResponses.put(i, answer);
+                responses.put(i, answer);
+            }
+            i++;
+        }
+
+        this.response = new CustomFormResponse(responses, dropdownResponses, inputResponses,
+                sliderResponses, stepSliderResponses, toggleResponses, labelResponses);
+    }
+}

api/src/main/java/org/geysermc/api/window/FormWindow.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.geysermc.api.window.response.FormResponse;
+
+public abstract class FormWindow {
+
+    @Getter
+    private final String type;
+
+    @Getter
+    protected FormResponse response;
+
+    @Getter
+    @Setter
+    protected boolean closed;
+
+    public FormWindow(String type) {
+        this.type = type;
+    }
+
+    // Lombok won't work here, so we need to make our own method
+    public void setResponse(FormResponse response) {
+        this.response = response;
+    }
+
+    public abstract String getJSONData();
+
+    public abstract void setResponse(String response);
+
+}

api/src/main/java/org/geysermc/api/window/ModalFormWindow.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window;
+
+import com.google.gson.Gson;
+import lombok.Getter;
+import lombok.Setter;
+import org.geysermc.api.window.response.ModalFormResponse;
+
+public class ModalFormWindow extends FormWindow {
+
+    @Getter
+    @Setter
+    private String title;
+
+    @Getter
+    @Setter
+    private String content;
+
+    @Getter
+    @Setter
+    private String button1;
+
+    @Getter
+    @Setter
+    private String button2;
+
+    public ModalFormWindow(String title, String content, String button1, String button2) {
+        super("modal");
+
+        this.title = title;
+        this.content = content;
+        this.button1 = button1;
+        this.button2 = button2;
+    }
+
+    @Override
+    public String getJSONData() {
+        return new Gson().toJson(this);
+    }
+
+    public void setResponse(String data) {
+        if (data == null || data.equalsIgnoreCase("null")) {
+            closed = true;
+            return;
+        }
+
+        if (Boolean.parseBoolean(data)) {
+            response = new ModalFormResponse(0, button1);
+        } else {
+            response = new ModalFormResponse(1, button2);
+        }
+    }
+}

api/src/main/java/org/geysermc/api/window/SimpleFormWindow.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window;
+
+import com.google.gson.Gson;
+import lombok.Getter;
+import lombok.Setter;
+import org.geysermc.api.window.button.FormButton;
+import org.geysermc.api.window.response.SimpleFormResponse;
+
+import java.util.ArrayList;
+import java.util.List;
+
+
+public class SimpleFormWindow extends FormWindow {
+
+    @Getter
+    @Setter
+    private String title;
+
+    @Getter
+    @Setter
+    private String content;
+
+    @Getter
+    @Setter
+    private List<FormButton> buttons;
+
+    public SimpleFormWindow(String title, String content) {
+        this(title, content, new ArrayList<FormButton>());
+    }
+
+    public SimpleFormWindow(String title, String content, List<FormButton> buttons) {
+        super("form");
+
+        this.title = title;
+        this.content = content;
+        this.buttons = buttons;
+    }
+
+    @Override
+    public String getJSONData() {
+        return new Gson().toJson(this);
+    }
+
+    public void setResponse(String data) {
+        if (data == null || data.equalsIgnoreCase("null")) {
+            closed = true;
+            return;
+        }
+
+        int buttonID;
+        try {
+            buttonID = Integer.parseInt(data);
+        } catch (Exception ex) {
+            return;
+        }
+
+        if (buttonID >= buttons.size()) {
+            response = new SimpleFormResponse(buttonID, null);
+            return;
+        }
+
+        response = new SimpleFormResponse(buttonID, buttons.get(buttonID));
+    }
+}

api/src/main/java/org/geysermc/api/window/button/FormButton.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.button;
+
+import lombok.Getter;
+import lombok.Setter;
+
+public class FormButton {
+
+    @Getter
+    @Setter
+    private String text;
+
+    @Getter
+    private FormImage image;
+
+    public FormButton(String text, FormImage image) {
+        this.text = text;
+
+        if (image.getData() != null && !image.getData().isEmpty()) {
+            this.image = image;
+        }
+    }
+
+    public void setImage(FormImage image) {
+        if (image.getData() != null && !image.getData().isEmpty()) {
+            this.image = image;
+        }
+    }
+}

api/src/main/java/org/geysermc/api/window/button/FormImage.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.button;
+
+import lombok.Getter;
+import lombok.Setter;
+
+public class FormImage {
+
+    @Getter
+    @Setter
+    private FormImageType type;
+
+    @Getter
+    @Setter
+    private String data;
+
+    public FormImage(FormImageType type, String data) {
+        this.type = type;
+        this.data = data;
+    }
+
+    public enum FormImageType {
+        PATH("path"),
+        URL("url");
+
+        @Getter
+        private String name;
+
+        FormImageType(String name) {
+            this.name = name;
+        }
+
+        @Override
+        public String toString() {
+            return name;
+        }
+    }
+}

api/src/main/java/org/geysermc/api/window/component/DropdownComponent.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.component;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.List;
+
+public class DropdownComponent extends FormComponent {
+
+    @Getter
+    @Setter
+    private String text;
+
+    @Getter
+    @Setter
+    private List<String> options;
+
+    @Getter
+    @Setter
+    private int defaultOptionIndex;
+
+    public DropdownComponent() {
+        super("dropdown");
+    }
+
+    public void addOption(String option, boolean isDefault) {
+        options.add(option);
+        if (isDefault)
+            defaultOptionIndex = options.size() - 1;
+    }
+}

api/src/main/java/org/geysermc/api/window/component/FormComponent.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.component;
+
+import lombok.Getter;
+
+public abstract class FormComponent {
+
+    @Getter
+    private final String type;
+
+    public FormComponent(String type) {
+        this.type = type;
+    }
+}

api/src/main/java/org/geysermc/api/window/component/InputComponent.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.component;
+
+import lombok.Getter;
+import lombok.Setter;
+
+public class InputComponent extends FormComponent {
+
+    @Getter
+    @Setter
+    private String text;
+
+    @Getter
+    @Setter
+    private String placeholder;
+
+    @Getter
+    @Setter
+    private String defaultText;
+
+    public InputComponent(String text, String placeholder, String defaultText) {
+        super("input");
+
+        this.text = text;
+        this.placeholder = placeholder;
+        this.defaultText = defaultText;
+    }
+}

api/src/main/java/org/geysermc/api/window/component/LabelComponent.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.component;
+
+import lombok.Getter;
+import lombok.Setter;
+
+public class LabelComponent extends FormComponent {
+
+    @Getter
+    @Setter
+    private String text;
+
+    public LabelComponent(String text) {
+        super("label");
+
+        this.text = text;
+    }
+}

api/src/main/java/org/geysermc/api/window/component/SliderComponent.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.component;
+
+import lombok.Getter;
+import lombok.Setter;
+
+public class SliderComponent extends FormComponent {
+
+    @Getter
+    @Setter
+    private String text;
+
+    @Getter
+    @Setter
+    private float min;
+
+    @Getter
+    @Setter
+    private float max;
+
+    @Getter
+    @Setter
+    private int step;
+
+    @Getter
+    @Setter
+    private float defaultValue;
+
+    public SliderComponent(String text, float min, float max, int step, float defaultValue) {
+        super("slider");
+
+        this.text = text;
+        this.min = min < 0f ? 0f : min;
+        this.max = max > this.min ? max : this.min;
+        if (step != -1f && step > 0)
+            this.step = step;
+
+        if (defaultValue != -1f)
+            this.defaultValue = defaultValue;
+    }
+}

api/src/main/java/org/geysermc/api/window/component/StepSliderComponent.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.component;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class StepSliderComponent extends FormComponent {
+
+    @Getter
+    @Setter
+    private String text;
+
+    @Getter
+    private List<String> steps;
+
+    @Getter
+    @Setter
+    private int defaultStepIndex;
+
+    public StepSliderComponent(String text) {
+        this(text, new ArrayList<String>());
+    }
+
+    public StepSliderComponent(String text, List<String> steps) {
+        this(text, steps, 0);
+    }
+
+    public StepSliderComponent(String text, List<String> steps, int defaultStepIndex) {
+        super("step_slider");
+
+        this.text = text;
+        this.steps = steps;
+        this.defaultStepIndex = defaultStepIndex;
+    }
+
+    public void addStep(String step, boolean isDefault) {
+        steps.add(step);
+
+        if (isDefault)
+            defaultStepIndex = steps.size() - 1;
+    }
+}

api/src/main/java/org/geysermc/api/window/component/ToggleComponent.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.component;
+
+public class ToggleComponent extends FormComponent {
+
+    private String text;
+    private boolean defaultValue;
+
+    public ToggleComponent(String text) {
+        this(text, false);
+    }
+
+    public ToggleComponent(String text, boolean defaultValue) {
+        super("toggle");
+
+        this.text = text;
+        this.defaultValue = defaultValue;
+    }
+}

api/src/main/java/org/geysermc/api/window/response/CustomFormResponse.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+import java.util.Map;
+
+@Getter
+@AllArgsConstructor
+public class CustomFormResponse implements FormResponse {
+
+    private Map<Integer, Object> responses;
+    private Map<Integer, FormResponseData> dropdownResponses;
+    private Map<Integer, String> inputResponses;
+    private Map<Integer, Float> sliderResponses;
+    private Map<Integer, FormResponseData> stepSliderResponses;
+    private Map<Integer, Boolean> toggleResponses;
+    private Map<Integer, String> labelResponses;
+}

api/src/main/java/org/geysermc/api/window/response/FormResponse.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.response;
+
+public interface FormResponse {
+}

api/src/main/java/org/geysermc/api/window/response/FormResponseData.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@AllArgsConstructor
+@Getter
+public class FormResponseData {
+
+    private int elementID;
+    private String elementContent;
+}

api/src/main/java/org/geysermc/api/window/response/ModalFormResponse.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class ModalFormResponse implements FormResponse {
+
+    private int clickedButtonId;
+    private String clickedButtonText;
+}

api/src/main/java/org/geysermc/api/window/response/SimpleFormResponse.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2019 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/Geyser
+ */
+
+package org.geysermc.api.window.response;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.geysermc.api.window.button.FormButton;
+
+@Getter
+@AllArgsConstructor
+public class SimpleFormResponse implements FormResponse {
+
+    private int clickedButtonId;
+    private FormButton clickedButton;
+}

connector/src/main/java/org/geysermc/connector/network/ConnectorServerEventHandler.java

@@ -30,7 +30,7 @@ import com.nukkitx.protocol.bedrock.BedrockPong;
 import com.nukkitx.protocol.bedrock.BedrockServerEventHandler;
 import com.nukkitx.protocol.bedrock.BedrockServerSession;
 import com.nukkitx.protocol.bedrock.v361.Bedrock_v361;
-import org.geysermc.api.events.player.PingEvent;
+import org.geysermc.api.events.PingEvent;
 import org.geysermc.connector.GeyserConnector;
 import org.geysermc.connector.configuration.GeyserConfiguration;
 import org.geysermc.connector.console.GeyserLogger;

connector/src/main/java/org/geysermc/connector/network/UpstreamPacketHandler.java

@@ -34,8 +34,12 @@ import com.nukkitx.protocol.bedrock.packet.*;
 import net.minidev.json.JSONArray;
 import net.minidev.json.JSONObject;
 import net.minidev.json.JSONValue;
+import org.geysermc.api.events.player.PlayerFormResponseEvent;
+import org.geysermc.api.window.FormWindow;
 import org.geysermc.connector.GeyserConnector;
 import org.geysermc.connector.network.session.GeyserSession;
+import org.geysermc.connector.network.session.auth.BedrockAuthData;
+import org.geysermc.connector.network.session.cache.WindowCache;
 
 import java.util.UUID;
 
@@ -69,7 +73,7 @@ public class UpstreamPacketHandler implements BedrockPacketHandler {
             JWSObject identity = JWSObject.parse((String) identityObject);
             JSONObject extraData = (JSONObject) identity.getPayload().toJSONObject().get("extraData");
 
-            session.setAuthenticationData(extraData.getAsString("displayName"), UUID.fromString(extraData.getAsString("identity")), extraData.getAsString("XUID"));
+            session.setAuthenticationData(new BedrockAuthData(extraData.getAsString("displayName"), UUID.fromString(extraData.getAsString("identity")), extraData.getAsString("XUID")));
         } catch (Exception ex) {
             session.getUpstream().disconnect("An internal error occurred when connecting to this server.");
             ex.printStackTrace();
@@ -82,6 +86,18 @@ public class UpstreamPacketHandler implements BedrockPacketHandler {
 
         ResourcePacksInfoPacket resourcePacksInfo = new ResourcePacksInfoPacket();
         session.getUpstream().sendPacketImmediately(resourcePacksInfo);
+
+        // TODO: Implement this
+        /**
+        CustomFormWindow window = new CustomFormBuilder("Login")
+                .addComponent(new LabelComponent("Minecraft: Java Edition account authentication."))
+                .addComponent(new LabelComponent("Enter the credentials for your Minecraft: Java Edition account below."))
+                .addComponent(new InputComponent("Email/Username", "account@geysermc.org", ""))
+                .addComponent(new InputComponent("Password", "123456", ""))
+                .build();
+
+        session.sendForm(window, 1);
+         */
         return true;
     }
 
@@ -304,7 +320,16 @@ public class UpstreamPacketHandler implements BedrockPacketHandler {
     @Override
     public boolean handle(ModalFormResponsePacket packet) {
         connector.getLogger().debug("Handled packet: " + packet.getClass().getSimpleName());
+        WindowCache windowCache = session.getWindowCache();
+        if (!windowCache.getWindows().containsKey(packet.getFormId()))
             return false;
+
+        FormWindow window = windowCache.getWindows().remove(packet.getFormId());
+        window.setResponse(packet.getFormData().trim());
+
+        PlayerFormResponseEvent event = new PlayerFormResponseEvent(session, packet.getFormId(), window);
+        connector.getPluginManager().runEvent(event);
+        return true;
     }
 
     @Override

connector/src/main/java/org/geysermc/connector/network/remote/RemoteJavaServer.java

@@ -27,10 +27,11 @@ package org.geysermc.connector.network.remote;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
+import org.geysermc.api.RemoteServer;
 
 @Getter
 @AllArgsConstructor
-public class RemoteJavaServer {
+public class RemoteJavaServer implements RemoteServer  {
 
     private String address;
     private int port;

connector/src/main/java/org/geysermc/connector/network/session/GeyserSession.java

@@ -36,21 +36,21 @@ import com.nukkitx.network.util.DisconnectReason;
 import com.nukkitx.protocol.PlayerSession;
 import com.nukkitx.protocol.bedrock.BedrockServerSession;
 import com.nukkitx.protocol.bedrock.packet.TextPacket;
-import lombok.AllArgsConstructor;
 import lombok.Getter;
-import org.geysermc.api.command.CommandSender;
+import org.geysermc.api.Player;
+import org.geysermc.api.RemoteServer;
+import org.geysermc.api.session.AuthData;
+import org.geysermc.api.window.FormWindow;
 import org.geysermc.connector.GeyserConnector;
-import org.geysermc.connector.network.remote.RemoteJavaServer;
+import org.geysermc.connector.network.session.cache.WindowCache;
 import org.geysermc.connector.network.translators.Registry;
 
-import java.util.UUID;
-
-public class GeyserSession implements PlayerSession, CommandSender {
+public class GeyserSession implements PlayerSession, Player {
 
     private GeyserConnector connector;
 
     @Getter
-    private RemoteJavaServer remoteServer;
+    private RemoteServer remoteServer;
 
     @Getter
     private BedrockServerSession upstream;
@@ -61,16 +61,21 @@ public class GeyserSession implements PlayerSession, CommandSender {
     private final GeyserSession THIS = this;
 
     @Getter
-    private AuthenticationData authenticationData;
+    private AuthData authenticationData;
+
+    @Getter
+    private WindowCache windowCache;
 
     private boolean closed;
 
     public GeyserSession(GeyserConnector connector, BedrockServerSession bedrockServerSession) {
         this.connector = connector;
         this.upstream = bedrockServerSession;
+
+        this.windowCache = new WindowCache(this);
     }
 
-    public void connect(RemoteJavaServer remoteServer) {
+    public void connect(RemoteServer remoteServer) {
         MinecraftProtocol protocol = new MinecraftProtocol(authenticationData.getName());
         downstream = new Client(remoteServer.getAddress(), remoteServer.getPort(), protocol, new TcpSessionFactory());
         downstream.getSession().addListener(new SessionAdapter() {
@@ -123,8 +128,8 @@ public class GeyserSession implements PlayerSession, CommandSender {
         downstream.getSession().disconnect("Disconnected from server. Reason: " + reason);
     }
 
-    public void setAuthenticationData(String name, UUID uuid, String xboxUUID) {
-        authenticationData = new AuthenticationData(name, uuid, xboxUUID);
+    public void setAuthenticationData(AuthData authData) {
+        authenticationData = authData;
     }
 
     @Override
@@ -152,12 +157,11 @@ public class GeyserSession implements PlayerSession, CommandSender {
         }
     }
 
-    @Getter
-    @AllArgsConstructor
-    public class AuthenticationData {
+    public void sendForm(FormWindow window, int id) {
+        windowCache.showWindow(window, id);
+    }
 
-        private String name;
-        private UUID uuid;
-        private String xboxUUID;
+    public void sendForm(FormWindow window) {
+        windowCache.showWindow(window);
     }
 }

connector/src/main/java/org/geysermc/connector/network/session/auth/BedrockAuthData.java

@@ -0,0 +1,16 @@
+package org.geysermc.connector.network.session.auth;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.geysermc.api.session.AuthData;
+
+import java.util.UUID;
+
+@Getter
+@AllArgsConstructor
+public class BedrockAuthData implements AuthData {
+
+    private String name;
+    private UUID UUID;
+    private String xboxUUID;
+}

connector/src/main/java/org/geysermc/connector/network/session/cache/WindowCache.java

@@ -0,0 +1,54 @@
+package org.geysermc.connector.network.session.cache;
+
+import com.nukkitx.protocol.bedrock.packet.ModalFormRequestPacket;
+import lombok.Getter;
+import org.geysermc.connector.network.session.GeyserSession;
+import org.geysermc.api.window.FormWindow;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class WindowCache {
+
+    private GeyserSession session;
+
+    public WindowCache(GeyserSession session) {
+        this.session = session;
+    }
+
+    @Getter
+    private Map<Integer, FormWindow> windows = new HashMap<Integer, FormWindow>();
+
+    public void addWindow(FormWindow window) {
+        windows.put(windows.size() + 1, window);
+    }
+
+    public void addWindow(FormWindow window, int id) {
+        windows.put(id, window);
+    }
+
+    public void showWindow(FormWindow window) {
+        showWindow(window, windows.size() + 1);
+    }
+
+    public void showWindow(int id) {
+        if (!windows.containsKey(id))
+            return;
+
+        ModalFormRequestPacket formRequestPacket = new ModalFormRequestPacket();
+        formRequestPacket.setFormId(id);
+        formRequestPacket.setFormData(windows.get(id).getJSONData());
+
+        session.getUpstream().sendPacket(formRequestPacket);
+    }
+
+    public void showWindow(FormWindow window, int id) {
+        ModalFormRequestPacket formRequestPacket = new ModalFormRequestPacket();
+        formRequestPacket.setFormId(id);
+        formRequestPacket.setFormData(window.getJSONData());
+
+        session.getUpstream().sendPacket(formRequestPacket);
+
+        addWindow(window, id);
+    }
+}