添加Pdf读取mcp

pdf-reader-mcp/src/utils/pathUtils.ts

@@ -0,0 +1,33 @@
+import path from 'path';
+// Removed unused import: import { fileURLToPath } from 'url';
+import { McpError, ErrorCode } from '@modelcontextprotocol/sdk/types.js';
+
+// Use the server's current working directory as the project root.
+// This relies on the process launching the server to set the CWD correctly.
+export const PROJECT_ROOT = process.cwd();
+
+console.info(`[Filesystem MCP - pathUtils] Project Root determined from CWD: ${PROJECT_ROOT}`); // Use info instead of log
+
+/**
+ * Resolves a user-provided relative path against the project root,
+ * ensuring it stays within the project boundaries.
+ * Throws McpError on invalid input, absolute paths, or path traversal.
+ * @param userPath The relative path provided by the user.
+ * @returns The resolved absolute path.
+ */
+export const resolvePath = (userPath: string): string => {
+  if (typeof userPath !== 'string') {
+    throw new McpError(ErrorCode.InvalidParams, 'Path must be a string.');
+  }
+  const normalizedUserPath = path.normalize(userPath);
+  if (path.isAbsolute(normalizedUserPath)) {
+    throw new McpError(ErrorCode.InvalidParams, 'Absolute paths are not allowed.');
+  }
+  // Resolve against the calculated PROJECT_ROOT
+  const resolved = path.resolve(PROJECT_ROOT, normalizedUserPath);
+  // Security check: Ensure the resolved path is still within the project root
+  if (!resolved.startsWith(PROJECT_ROOT)) {
+    throw new McpError(ErrorCode.InvalidRequest, 'Path traversal detected. Access denied.');
+  }
+  return resolved;
+};