[Feature] Modal refactoring & select menu support

src/Discord.Net.Core/Entities/Interactions/MessageComponents/Builders/ButtonBuilder.cs

@@ -9,6 +9,7 @@ namespace Discord;
 /// </summary>
 public class ButtonBuilder : IInteractableComponentBuilder
 {
+    /// <inheritdoc />
     public ComponentType Type => ComponentType.Button;
 
     /// <summary>

src/Discord.Net.Core/Entities/Interactions/MessageComponents/Builders/ComponentBuilder.cs

@@ -10,7 +10,7 @@ namespace Discord;
 public class ComponentBuilder
 {
     /// <summary>
-    ///     The max length of a <see cref="ButtonComponent.CustomId"/>.
+    ///     The max length of <see cref="ButtonComponent.CustomId"/> and <see cref="SelectMenuComponent.CustomId"/>.
     /// </summary>
     public const int MaxCustomIdLength = 100;
 

src/Discord.Net.Core/Entities/Interactions/MessageComponents/Builders/ComponentContainerExtensions.cs

@@ -469,6 +469,54 @@ public static BuilderT WithActionRow<BuilderT>(this BuilderT container,
         return container.WithActionRow(cont);
     }
 
+    /// <summary>
+    ///     Adds a <see cref="FileUploadComponentBuilder"/> to the container.
+    /// </summary>
+    /// <returns>
+    ///     The current container.
+    /// </returns>
+    public static BuilderT WithFileUpload<BuilderT>(this BuilderT container, FileUploadComponentBuilder fileUpload)
+        where BuilderT : class, IInteractableComponentContainer
+    {
+        container.AddComponent(fileUpload);
+        return container;
+    }
+
+    /// <summary>
+    ///     Adds a <see cref="FileUploadComponentBuilder"/> to the container.
+    /// </summary>
+    /// <returns>
+    ///     The current container.
+    /// </returns>
+    public static BuilderT WithFileUpload<BuilderT>(this BuilderT container,
+        string customId,
+        int? minValues = null,
+        int? maxValues = null,
+        bool isRequired = true,
+        int? id = null)
+        where BuilderT : class, IInteractableComponentContainer
+        => container.WithFileUpload(new FileUploadComponentBuilder()
+            .WithCustomId(customId)
+            .WithMinValues(minValues)
+            .WithMaxValues(maxValues)
+            .WithRequired(isRequired)
+            .WithId(id));
+
+    /// <summary>
+    ///     Adds a <see cref="FileUploadComponentBuilder"/> to the container.
+    /// </summary>
+    /// <returns>
+    ///     The current container.
+    /// </returns>
+    public static BuilderT WithFileUpload<BuilderT>(this BuilderT container,
+        Action<FileUploadComponentBuilder> options)
+        where BuilderT : class, IInteractableComponentContainer
+    {
+        var comp = new FileUploadComponentBuilder();
+        options(comp);
+        return container.WithFileUpload(comp);
+    }
+
     /// <summary>
     ///     Finds the first <see cref="IMessageComponentBuilder"/> in the <see cref="IComponentContainer"/>
     ///     or any of its child <see cref="IComponentContainer"/>s with matching id.

src/Discord.Net.Core/Entities/Interactions/MessageComponents/Builders/FileComponentBuilder.cs

@@ -2,6 +2,9 @@
 
 namespace Discord;
 
+/// <summary>
+///     Represents a class used to build <see cref="FileComponent"/>'s.
+/// </summary>
 public class FileComponentBuilder : IMessageComponentBuilder
 {
     /// <inheritdoc />

src/Discord.Net.Core/Entities/Interactions/MessageComponents/Builders/FileUploadComponentBuilder.cs

@@ -0,0 +1,192 @@
+using System;
+
+namespace Discord;
+
+/// <summary>
+///     Represents a class used to build <see cref="FileUploadComponent"/>'s.
+/// </summary>
+public class FileUploadComponentBuilder : IInteractableComponentBuilder
+{
+    /// <summary>
+    ///     The maximum number of values for the <see cref="FileUploadComponentBuilder.MinValues"/> and <see cref="FileUploadComponentBuilder.MaxValues"/> properties.
+    /// </summary>
+    public const int MaxFileCount = 10;
+
+    /// <inheritdoc/>
+    public ComponentType Type => ComponentType.FileUpload;
+
+    /// <inheritdoc />
+    public int? Id { get; set; }
+
+    /// <summary>
+    ///     Gets or sets the custom id of the current file upload.
+    /// </summary>
+    /// <exception cref="ArgumentException" accessor="set"><see cref="CustomId"/> length exceeds <see cref="ModalComponentBuilder.MaxCustomIdLength"/>.</exception>
+    /// <exception cref="ArgumentException" accessor="set"><see cref="CustomId"/> length subceeds 1.</exception>
+    public string CustomId
+    {
+        get => _customId;
+        set
+        {
+            if (value is not null)
+            {
+                Preconditions.AtLeast(value.Length, 1, nameof(CustomId));
+                Preconditions.AtMost(value.Length, ModalComponentBuilder.MaxCustomIdLength, nameof(CustomId));
+            }
+
+            _customId = value;
+        }
+    }
+
+    /// <summary>
+    ///     Gets or sets the minimum number of items that must be uploaded (defaults to 1).
+    /// </summary>
+    /// <exception cref="ArgumentException" accessor="set"><see cref="MinValues"/> exceeds <see cref="MaxFileCount"/>.</exception>
+    /// <exception cref="ArgumentException" accessor="set"><see cref="MinValues"/> length subceeds 0.</exception>
+    public int? MinValues
+    {
+        get => _minValues;
+        set
+        {
+            if (value is not null)
+            {
+                Preconditions.AtLeast(value.Value, 0, nameof(MinValues));
+                Preconditions.AtMost(value.Value, MaxFileCount, nameof(MinValues));
+            }
+
+            _minValues = value;
+        }
+    }
+
+    /// <summary>
+    ///     Gets or sets the maximum number of items that can be uploaded (defaults to 1).
+    /// </summary>
+    /// <exception cref="ArgumentException" accessor="set"><see cref="MaxValues"/> exceeds <see cref="MaxFileCount"/>.</exception>
+    public int? MaxValues
+    {
+        get => _maxValues;
+        set
+        {
+            if (value is not null)
+            {
+                Preconditions.AtMost(value.Value, MaxFileCount, nameof(MaxValues));
+            }
+
+            _maxValues = value;
+        }
+    }
+
+    /// <summary>
+    ///     Gets or sets a value indicating whether the current file upload requires files to be uploaded before submitting the modal (defaults to <see langword="true"></see>).
+    /// </summary>
+    public bool IsRequired { get; set; } = true;
+
+    /// <summary>
+    ///     Sets the custom id of the current file upload.
+    /// </summary>
+    /// <param name="customId">The id to use for the current file upload.</param>
+    /// <inheritdoc cref="CustomId"/>
+    /// <returns>The current builder.</returns>
+    public FileUploadComponentBuilder WithCustomId(string customId)
+    {
+        CustomId = customId;
+        return this;
+    }
+
+    /// <summary>
+    ///     Sets the minimum number of items that must be uploaded (defaults to 1).
+    /// </summary>
+    /// <param name="minValues">Sets the minimum number of items that must be uploaded.</param>
+    /// <inheritdoc cref="MinValues"/>
+    /// <returns>
+    ///     The current builder.
+    /// </returns>
+    public FileUploadComponentBuilder WithMinValues(int? minValues)
+    {
+        MinValues = minValues;
+        return this;
+    }
+
+    /// <summary>
+    ///     Sets the maximum number of items that can be uploaded (defaults to 1).
+    /// </summary>
+    /// <param name="maxValues">The maximum number of items that can be uploaded.</param>
+    /// <inheritdoc cref="MaxValues"/>
+    /// <returns>
+    ///     The current builder.
+    /// </returns>
+    public FileUploadComponentBuilder WithMaxValues(int? maxValues)
+    {
+        MaxValues = maxValues;
+        return this;
+    }
+
+    /// <summary>
+    ///     Sets whether the current file upload requires files to be uploaded before submitting the modal.
+    /// </summary>
+    /// <param name="isRequired">Whether the current file upload requires files to be uploaded before submitting the modal.</param>
+    /// <returns>
+    ///     The current builder.
+    /// </returns>
+    public FileUploadComponentBuilder WithRequired(bool isRequired)
+    {
+        IsRequired = isRequired;
+        return this;
+    }
+
+    private string _customId;
+    private int? _minValues;
+    private int? _maxValues;
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="FileUploadComponentBuilder"/>.
+    /// </summary>
+    public FileUploadComponentBuilder() {}
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="FileUploadComponentBuilder"/>.
+    /// </summary>
+    /// <param name="customId">The custom id of the current file upload.</param>
+    /// <param name="minValues">The minimum number of items that must be uploaded (defaults to 1).</param>
+    /// <param name="maxValues">the maximum number of items that can be uploaded (defaults to 1).</param>
+    /// <param name="isRequired">Whether the current file upload requires files to be uploaded before submitting the modal.</param>
+    /// <param name="id">The id for the component.</param>
+    public FileUploadComponentBuilder(string customId, int? minValues = null, int? maxValues = null, bool isRequired = true, int? id = null)
+    {
+        CustomId = customId;
+        MinValues = minValues;
+        MaxValues = maxValues;
+        IsRequired = isRequired;
+        Id = id;
+    }
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="FileUploadComponentBuilder"/> class from an existing <see cref="FileUploadComponent"/>.
+    /// </summary>
+    /// <param name="fileUpload">The component.</param>
+    public FileUploadComponentBuilder(FileUploadComponent fileUpload)
+    {
+        CustomId = fileUpload.CustomId;
+        MinValues = fileUpload.MinValues;
+        MaxValues = fileUpload.MaxValues;
+        IsRequired = fileUpload.IsRequired;
+        Id = fileUpload.Id;
+    }
+
+    /// <inheritdoc cref="IMessageComponentBuilder.Build" />
+    public FileUploadComponent Build()
+    {
+        Preconditions.NotNullOrWhitespace(CustomId, nameof(CustomId));
+
+        if (MinValues is not null && MaxValues is not null)
+            Preconditions.AtLeast(MaxValues.Value, MinValues.Value, nameof(MaxValues));
+
+        Preconditions.AtMost(MinValues ?? 0, MaxFileCount, nameof(MinValues));
+        Preconditions.AtMost(MaxValues ?? 0, MaxFileCount, nameof(MaxValues));
+
+        return new FileUploadComponent(Id, CustomId, MinValues, MaxValues, IsRequired);
+    }
+
+    /// <inheritdoc/>
+    IMessageComponent IMessageComponentBuilder.Build() => Build();
+}