chore: import upstream snapshot with attribution

api/server/controllers/TokenConfigController.js

@@ -0,0 +1,32 @@
+const { logger } = require('@librechat/data-schemas');
+const { resolveTokenConfigMap } = require('@librechat/api');
+const { getModelsConfig } = require('~/server/controllers/ModelController');
+const { getValueKey, getMultiplier, getCacheMultiplier } = require('~/models');
+
+/**
+ * Returns server-resolved context windows (and pricing when
+ * `interface.contextCost` is enabled) for every configured model. Resolution
+ * lives in `@librechat/api`; this controller only supplies request-scoped deps.
+ * @param {ServerRequest} req
+ * @param {ServerResponse} res
+ */
+async function tokenConfigController(req, res) {
+  try {
+    const modelsConfig = await getModelsConfig(req);
+    const tokenConfigMap = await resolveTokenConfigMap(
+      {
+        appConfig: req.config,
+        modelsConfig,
+        userId: req.user.id,
+        tenantId: req.user.tenantId,
+      },
+      { getValueKey, getMultiplier, getCacheMultiplier },
+    );
+    res.json(tokenConfigMap);
+  } catch (error) {
+    logger.error('[tokenConfigController]', error);
+    res.status(500).json({ error: 'Failed to resolve token config' });
+  }
+}
+
+module.exports = tokenConfigController;