/// <summary>
/// Modifies this webhook.
/// </summary>
/// <param name="name">New default name for this webhook.</param>
/// <param name="avatar">New avatar for this webhook.</param>
/// <param name="channelId">The new channel id to move the webhook to.</param>
/// <returns>The modified webhook.</returns>
/// <exception cref="Exceptions.UnauthorizedException">Thrown when the client does not have the <see cref="Permissions.ManageWebhooks"/> permission.</exception>
/// <exception cref="Exceptions.NotFoundException">Thrown when the webhook does not exist.</exception>
/// <exception cref="Exceptions.BadRequestException">Thrown when an invalid parameter was provided.</exception>
/// <exception cref="Exceptions.ServerErrorException">Thrown when Discord is unable to process the request.</exception>
public Task <DiscordWebhook> ModifyAsync(string name = null, Optional <Stream> avatar = default, ulong?channelId = null)
{
var avatarb64 = Optional.FromNoValue <string>();
if (avatar.HasValue && avatar.Value != null)
{
using (var imgtool = new ImageTool(avatar.Value))
avatarb64 = imgtool.GetBase64();
}
else if (avatar.HasValue)
{
avatarb64 = null;
}
var newChannelId = channelId.HasValue ? channelId.Value : this.ChannelId;
return(this.Discord.ApiClient.ModifyWebhookAsync(newChannelId, this.Id, name, avatarb64, Token));
}