Feat/lock command (#1237)

* WIP

* feat: lock command

src/programs/lock/lock.ts

@@ -0,0 +1,68 @@
+import {
+  Command,
+  CommandHandler,
+  DiscordEvent,
+} from "../../event-distribution";
+import {
+  ApplicationCommandOptionType,
+  ChannelType,
+  ChatInputCommandInteraction,
+} from "discord.js";
+import Tools from "../../common/tools";
+
+const enum Errors {
+  NOT_IN_GUILD = "NOT_IN_GUILD",
+  SUPPORT_NOT_FOUND = "SUPPORT_NOT_FOUND",
+}
+
+@Command({
+  event: DiscordEvent.SLASH_COMMAND,
+  root: "lock",
+  description: "Quickly lock a chat if it starts getting out of hand",
+  options: [
+    {
+      type: ApplicationCommandOptionType.Channel,
+      description: "The channel to lock",
+      name: "channel",
+      required: false,
+    },
+  ],
+  errors: {
+    [Errors.NOT_IN_GUILD]: "The command can only be used on a server!",
+  },
+})
+class LockChannel extends CommandHandler<DiscordEvent.SLASH_COMMAND> {
+  async handle(interaction: ChatInputCommandInteraction): Promise<void> {
+    const channelOption = interaction.options.getChannel("channel");
+    const optionChannel =
+      interaction.guild && channelOption
+        ? await interaction.guild.channels.fetch(channelOption.id)
+        : undefined;
+
+    const channel = optionChannel ?? interaction.channel;
+    if (channel?.type !== ChannelType.GuildText) {
+      throw new Error(Errors.NOT_IN_GUILD);
+    }
+
+    await interaction.deferReply({ ephemeral: true });
+
+    const support = Tools.getRoleByName("Support", channel.guild);
+    if (!support) {
+      throw new Error(Errors.SUPPORT_NOT_FOUND);
+    }
+
+    await channel.permissionOverwrites.create(support, {
+      SendMessages: true,
+    });
+    await channel.permissionOverwrites.edit(channel.guild.roles.everyone, {
+      SendMessages: false,
+    });
+
+    await channel.send("This channel has been temporarily locked!");
+
+    await interaction.editReply({
+      content:
+        "The channel has been locked. Go to its permissions and set 'Send Messages' for the Member or everyone role **TO NEUTRAL** unlock it!",
+    });
+  }
+}