src/controllers/api/nemesisController.ts

@@ -1,4 +1,4 @@
-import { getInfNodes } from "@/src/helpers/nemesisHelpers";
+import { getInfNodes, getNemesisPasscode } from "@/src/helpers/nemesisHelpers";
 import { getJSONfromString } from "@/src/helpers/stringHelpers";
 import { freeUpSlot, getInventory } from "@/src/services/inventoryService";
 import { getAccountIdForRequest } from "@/src/services/loginService";
@@ -45,6 +45,26 @@ export const nemesisController: RequestHandler = async (req, res) => {
                 [body.Category]: [destWeapon.toJSON()]
             }
         });
+    } else if ((req.query.mode as string) == "p") {
+        const inventory = await getInventory(accountId, "Nemesis");
+        const body = getJSONfromString<INemesisPrespawnCheckRequest>(String(req.body));
+        const passcode = getNemesisPasscode(inventory.Nemesis!.fp, inventory.Nemesis!.Faction);
+        let guessResult = 0;
+        if (inventory.Nemesis!.Faction == "FC_INFESTATION") {
+            for (let i = 0; i != 3; ++i) {
+                if (body.guess[i] == passcode[0]) {
+                    guessResult = 1 + i;
+                    break;
+                }
+            }
+        } else {
+            for (let i = 0; i != 3; ++i) {
+                if (body.guess[i] == passcode[i]) {
+                    ++guessResult;
+                }
+            }
+        }
+        res.json({ GuessResult: guessResult });
     } else if ((req.query.mode as string) == "s") {
         const inventory = await getInventory(accountId, "Nemesis NemesisAbandonedRewards");
         const body = getJSONfromString<INemesisStartRequest>(String(req.body));
@@ -148,6 +168,11 @@ interface INemesisStartRequest {
     };
 }
 
+interface INemesisPrespawnCheckRequest {
+    guess: number[]; // .length == 3
+    potency?: number[];
+}
+
 const kuvaLichVersionSixWeapons = [
     "/Lotus/Weapons/Grineer/KuvaLich/LongGuns/Drakgoon/KuvaDrakgoon",
     "/Lotus/Weapons/Grineer/KuvaLich/LongGuns/Karak/KuvaKarak",

src/helpers/nemesisHelpers.ts

@@ -1,5 +1,6 @@
 import { ExportRegions } from "warframe-public-export-plus";
 import { IInfNode } from "@/src/types/inventoryTypes/inventoryTypes";
+import { SRng } from "@/src/services/rngService";
 
 export const getInfNodes = (faction: string, rank: number): IInfNode[] => {
     const infNodes = [];
@@ -30,3 +31,14 @@ const systemIndexes: Record<string, number[]> = {
     FC_CORPUS: [1, 15, 4, 7, 8],
     FC_INFESTATION: [23]
 };
+
+// Get a parazon 'passcode' based on the nemesis fingerprint so it's always the same for the same nemesis.
+export const getNemesisPasscode = (fp: bigint, faction: string): number[] => {
+    const rng = new SRng(fp);
+    const passcode = [rng.randomInt(0, 7)];
+    if (faction != "FC_INFESTATION") {
+        passcode.push(rng.randomInt(0, 7));
+        passcode.push(rng.randomInt(0, 7));
+    }
+    return passcode;
+};