utility: add user flags dumping command

.eslintrc.js

@@ -27,5 +27,6 @@ module.exports = {
   },
   globals: {
     hf: true,
+    BigInt: true, // lol eslint
   },
 };

src/modules/utility.js

@@ -236,3 +236,61 @@ snowflake.callback = function (msg, line) {
   }
 };
 hf.registerCommand(snowflake);
+
+const USER_FLAGS = [
+  "STAFF",
+  "PARTNER",
+  "HYPESQUAD",
+  "BUG_HUNTER_LEVEL_1",
+  "MFA_SMS",
+  "PREMIUM_PROMO_DISMISSED",
+  "HYPESQUAD_ONLINE_HOUSE_1",
+  "HYPESQUAD_ONLINE_HOUSE_2",
+  "HYPESQUAD_ONLINE_HOUSE_3",
+  "PREMIUM_EARLY_SUPPORTER",
+  "TEAM_PSEUDO_USER",
+  "<Internal Application (Partner, etc) Flag>",
+  "SYSTEM",
+  "HAS_UNREAD_URGENT_MESSAGES",
+  "BUG_HUNTER_LEVEL_2",
+  "UNDERAGE_DELETED",
+  "VERIFIED_BOT",
+  "VERIFIED_DEVELOPER",
+  "CERTIFIED_MODERATOR",
+];
+
+const flagdump = new Command("flagdump");
+flagdump.category = CATEGORY;
+flagdump.helpText = "Dumps Discord user flags.";
+flagdump.usage = "[flags]";
+flagdump.callback = function (msg, line) {
+  const num = parseInt(line);
+  if (!isNaN(num)) {
+    const bits = num.toString(2);
+    const splitBits = bits.split("").reverse();
+
+    const reassignedBits = {};
+
+    for (const shift in splitBits) {
+      reassignedBits[shift] = splitBits[shift];
+    }
+
+    const flags = Object.keys(reassignedBits).filter(
+      (bit) => reassignedBits[bit] == 1
+    );
+
+    let out = "```\n";
+
+    for (const flag of flags) {
+      out +=
+        (USER_FLAGS[flag] || "<Undocumented Flag>") +
+        ` (1 << ${flag}, ${1n << BigInt(flag)})\n`;
+    }
+    out += "```";
+
+    return out;
+  } else {
+    return "Argument provided is not a number.";
+  }
+};
+hf.registerCommand(flagdump);