chore: import upstream snapshot with attribution

api/server/middleware/accessResources/canAccessPromptViaGroup.js

@@ -0,0 +1,55 @@
+const { ResourceType } = require('librechat-data-provider');
+const { canAccessResource } = require('./canAccessResource');
+const { getPrompt } = require('~/models');
+
+/**
+ * Prompt to PromptGroup ID resolver function
+ * Resolves prompt ID to its parent promptGroup ID
+ *
+ * @param {string} promptId - Prompt ID from route parameter
+ * @returns {Promise<Object|null>} Object with promptGroup's _id field, or null if not found
+ */
+const resolvePromptToGroupId = async (promptId) => {
+  const prompt = await getPrompt({ _id: promptId });
+  if (!prompt || !prompt.groupId) {
+    return null;
+  }
+  // Return an object with _id that matches the promptGroup ID
+  return { _id: prompt.groupId };
+};
+
+/**
+ * Middleware factory that checks promptGroup permissions when accessing individual prompts.
+ * This allows permission management at the promptGroup level while still supporting
+ * individual prompt access patterns.
+ *
+ * @param {Object} options - Configuration options
+ * @param {number} options.requiredPermission - The permission bit required (1=view, 2=edit, 4=delete, 8=share)
+ * @param {string} [options.resourceIdParam='promptId'] - The name of the route parameter containing the prompt ID
+ * @returns {Function} Express middleware function
+ *
+ * @example
+ * // Check promptGroup permissions when viewing a prompt
+ * router.get('/prompts/:promptId',
+ *   canAccessPromptViaGroup({ requiredPermission: 1 }),
+ *   getPrompt
+ * );
+ */
+const canAccessPromptViaGroup = (options) => {
+  const { requiredPermission, resourceIdParam = 'promptId' } = options;
+
+  if (!requiredPermission || typeof requiredPermission !== 'number') {
+    throw new Error('canAccessPromptViaGroup: requiredPermission is required and must be a number');
+  }
+
+  return canAccessResource({
+    resourceType: ResourceType.PROMPTGROUP,
+    requiredPermission,
+    resourceIdParam,
+    idResolver: resolvePromptToGroupId,
+  });
+};
+
+module.exports = {
+  canAccessPromptViaGroup,
+};