refactor: Implement file access filtering based on agent permissions

- Introduced `filterFilesByAgentAccess` function to filter files based on user access through agents.
- Updated `getFiles` and `primeFiles` functions to utilize the new filtering logic.
- Moved `hasAccessToFilesViaAgent` function from the File model to permission services, adjusting imports accordingly
- Enhanced tests to ensure proper access control and filtering behavior for files associated with agents.

api/models/File.js

@@ -1,7 +1,5 @@
 const { logger } = require('@librechat/data-schemas');
-const { EToolResources, FileContext, PERMISSION_BITS } = require('librechat-data-provider');
-const { checkPermission } = require('~/server/services/PermissionService');
-const { getAgent } = require('./Agent');
+const { EToolResources, FileContext } = require('librechat-data-provider');
 const { File } = require('~/db/models');
 
 /**
@@ -14,131 +12,17 @@ const findFileById = async (file_id, options = {}) => {
   return await File.findOne({ file_id, ...options }).lean();
 };
 
-/**
- * Checks if a user has access to multiple files through a shared agent (batch operation)
- * @param {string} userId - The user ID to check access for
- * @param {string[]} fileIds - Array of file IDs to check
- * @param {string} agentId - The agent ID that might grant access
- * @returns {Promise<Map<string, boolean>>} Map of fileId to access status
- */
-const hasAccessToFilesViaAgent = async (userId, fileIds, agentId, checkCollaborative = true) => {
-  const accessMap = new Map();
-
-  // Initialize all files as no access
-  fileIds.forEach((fileId) => accessMap.set(fileId, false));
-
-  try {
-    const agent = await getAgent({ id: agentId });
-
-    if (!agent) {
-      return accessMap;
-    }
-
-    // Check if user is the author - if so, grant access to all files
-    if (agent.author.toString() === userId) {
-      fileIds.forEach((fileId) => accessMap.set(fileId, true));
-      return accessMap;
-    }
-
-    // Check if user has at least VIEW permission on the agent
-    const hasViewPermission = await checkPermission({
-      userId,
-      resourceType: 'agent',
-      resourceId: agent._id,
-      requiredPermission: PERMISSION_BITS.VIEW,
-    });
-
-    if (!hasViewPermission) {
-      return accessMap;
-    }
-
-    // Check if user has EDIT permission (which would indicate collaborative access)
-    const hasEditPermission = await checkPermission({
-      userId,
-      resourceType: 'agent',
-      resourceId: agent._id,
-      requiredPermission: PERMISSION_BITS.EDIT,
-    });
-
-    // If user only has VIEW permission, they can't access files
-    // Only users with EDIT permission or higher can access agent files
-    if (!hasEditPermission) {
-      return accessMap;
-    }
-
-    // User has edit permissions - check which files are actually attached
-    const attachedFileIds = new Set();
-    if (agent.tool_resources) {
-      for (const [_resourceType, resource] of Object.entries(agent.tool_resources)) {
-        if (resource?.file_ids && Array.isArray(resource.file_ids)) {
-          resource.file_ids.forEach((fileId) => attachedFileIds.add(fileId));
-        }
-      }
-    }
-
-    // Grant access only to files that are attached to this agent
-    fileIds.forEach((fileId) => {
-      if (attachedFileIds.has(fileId)) {
-        accessMap.set(fileId, true);
-      }
-    });
-
-    return accessMap;
-  } catch (error) {
-    logger.error('[hasAccessToFilesViaAgent] Error checking file access:', error);
-    return accessMap;
-  }
-};
-
 /**
  * Retrieves files matching a given filter, sorted by the most recently updated.
  * @param {Object} filter - The filter criteria to apply.
  * @param {Object} [_sortOptions] - Optional sort parameters.
  * @param {Object|String} [selectFields={ text: 0 }] - Fields to include/exclude in the query results.
  *                                                   Default excludes the 'text' field.
- * @param {Object} [options] - Additional options
- * @param {string} [options.userId] - User ID for access control
- * @param {string} [options.agentId] - Agent ID that might grant access to files
  * @returns {Promise<Array<MongoFile>>} A promise that resolves to an array of file documents.
  */
-const getFiles = async (filter, _sortOptions, selectFields = { text: 0 }, options = {}) => {
+const getFiles = async (filter, _sortOptions, selectFields = { text: 0 }) => {
   const sortOptions = { updatedAt: -1, ..._sortOptions };
-  const files = await File.find(filter).select(selectFields).sort(sortOptions).lean();
-
-  // If userId and agentId are provided, filter files based on access
-  if (options.userId && options.agentId) {
-    // Collect file IDs that need access check
-    const filesToCheck = [];
-    const ownedFiles = [];
-
-    for (const file of files) {
-      if (file.user && file.user.toString() === options.userId) {
-        ownedFiles.push(file);
-      } else {
-        filesToCheck.push(file);
-      }
-    }
-
-    if (filesToCheck.length === 0) {
-      return ownedFiles;
-    }
-
-    // Batch check access for all non-owned files
-    const fileIds = filesToCheck.map((f) => f.file_id);
-    const accessMap = await hasAccessToFilesViaAgent(
-      options.userId,
-      fileIds,
-      options.agentId,
-      false,
-    );
-
-    // Filter files based on access
-    const accessibleFiles = filesToCheck.filter((file) => accessMap.get(file.file_id));
-
-    return [...ownedFiles, ...accessibleFiles];
-  }
-
-  return files;
+  return await File.find(filter).select(selectFields).sort(sortOptions).lean();
 };
 
 /**
@@ -292,5 +176,4 @@ module.exports = {
   deleteFiles,
   deleteFileByFilter,
   batchUpdateFiles,
-  hasAccessToFilesViaAgent,
 };