From 5c97b40237a9068f6c16483ef22b5341dffe1d8f Mon Sep 17 00:00:00 2001
From: "Claude (Chronicler #63)" <claude@firefrostgaming.com>
Date: Mon, 6 Apr 2026 10:01:53 +0000
Subject: [PATCH] fix(modpackchecker): Fix Technic API 401 error with dynamic
 build number
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ROOT CAUSE (Gemini consultation):
Technic blocks requests with old/deprecated build numbers. The hardcoded
'?build=1' was being rejected as an ancient launcher version.

SOLUTION:
- Fetch current stable launcher build from /launcher/version/stable4
- Use that build number in the modpack request
- Fallback to 999 if version check fails

This 'RV-Ready' approach requires zero maintenance as Technic updates
their launcher versions over time.

ALL 4 PLATFORMS NOW WORKING:
✅ Modrinth
✅ FTB
✅ CurseForge
✅ Technic

Signed-off-by: Claude (Chronicler #63) <claude@firefrostgaming.com>
---
 .../blueprint-extension/README.md                 |  4 ++--
 .../app/Http/Controllers/ModpackAPIController.php | 15 ++++++++++++++-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/services/modpack-version-checker/blueprint-extension/README.md b/services/modpack-version-checker/blueprint-extension/README.md
index 72adc39..bfa1664 100644
--- a/services/modpack-version-checker/blueprint-extension/README.md
+++ b/services/modpack-version-checker/blueprint-extension/README.md
@@ -48,9 +48,9 @@ A Pterodactyl Panel extension that checks modpack versions across CurseForge, Mo
 | CurseForge | Numeric project ID | ✅ Yes | ✅ Working |
 | Modrinth | Project ID or slug | ❌ No | ✅ Working |
 | FTB | Numeric modpack ID | ❌ No | ✅ Working |
-| Technic | URL slug | ⚠️ Unknown | ❌ 401 Auth Error |
+| Technic | URL slug | ❌ No | ✅ Working |
 
-> **Note (April 2026):** Technic Platform API now returns 401 Unauthorized. They may have changed their authentication requirements. Investigation ongoing.
+> **Note:** Technic requires a dynamic build number parameter. The extension automatically fetches the current launcher build from Technic's API to avoid 401 errors.
 
 ---
 
diff --git a/services/modpack-version-checker/blueprint-extension/app/Http/Controllers/ModpackAPIController.php b/services/modpack-version-checker/blueprint-extension/app/Http/Controllers/ModpackAPIController.php
index 77a1ddf..ae855b5 100644
--- a/services/modpack-version-checker/blueprint-extension/app/Http/Controllers/ModpackAPIController.php
+++ b/services/modpack-version-checker/blueprint-extension/app/Http/Controllers/ModpackAPIController.php
@@ -434,9 +434,22 @@ class ModpackAPIController extends Controller
      */
     private function checkTechnic(string $slug): array
     {
+        // TECHNIC API FIX (Gemini consultation, April 2026):
+        // Technic blocks requests with old/invalid build numbers.
+        // We dynamically fetch the current stable launcher build to avoid 401s.
+        // This "RV-Ready" approach requires zero maintenance as builds update.
+        
+        // Step 1: Get current stable launcher build number
+        $versionResponse = Http::get('https://api.technicpack.net/launcher/version/stable4');
+        $latestBuild = $versionResponse->successful() 
+            ? ($versionResponse->json('build') ?? 999) 
+            : 999; // Fallback to high number if version check fails
+        
+        // Step 2: Fetch modpack data with valid build number
         $response = Http::withHeaders([
+            'User-Agent' => 'FirefrostGaming/ModpackChecker/1.0',
             'Accept' => 'application/json',
-        ])->get("https://api.technicpack.net/modpack/{$slug}?build=1");
+        ])->get("https://api.technicpack.net/modpack/{$slug}?build={$latestBuild}");
 
         if (!$response->successful()) {
             throw new \Exception('Technic API request failed: ' . $response->status());