Add command to add servers from invites with eligibility check

backend/src/plugins/BotControl/functions/isEligible.ts

@@ -0,0 +1,46 @@
+import { User } from "discord.js";
+import { BotControlPluginType } from "../types";
+import { GlobalPluginData } from "knub";
+import { GuildInvite } from "../../../utils";
+
+const REQUIRED_MEMBER_COUNT = 5000;
+
+export async function isEligible(
+  pluginData: GlobalPluginData<BotControlPluginType>,
+  user: User,
+  invite: GuildInvite,
+): Promise<{ result: boolean; explanation: string }> {
+  if ((await pluginData.state.apiPermissionAssignments.getByUserId(user.id)).length) {
+    return {
+      result: true,
+      explanation: "User is an existing bot operator",
+    };
+  }
+
+  if (invite.guild.features.includes("PARTNERED")) {
+    return {
+      result: true,
+      explanation: "Server is partnered",
+    };
+  }
+
+  if (invite.guild.features.includes("VERIFIED")) {
+    return {
+      result: true,
+      explanation: "Server is verified",
+    };
+  }
+
+  const memberCount = invite.memberCount || 0;
+  if (memberCount >= REQUIRED_MEMBER_COUNT) {
+    return {
+      result: true,
+      explanation: `Server has ${memberCount} members, which is equal or higher than the required ${REQUIRED_MEMBER_COUNT}`,
+    };
+  }
+
+  return {
+    result: false,
+    explanation: "Server does not meet requirements",
+  };
+}