|
|
| """
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| Emgena Next.js 15 & React 19 Fullstack Guard MCP
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| Protocol: Model Context Protocol (MCP) JSON-RPC 2.0 via stdio
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| Zero External Dependencies (Standard Python 3.10+)
|
| """
|
|
|
| import sys
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| import os
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| import json
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| import re
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| from pathlib import Path
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| from typing import Dict, Any, List, Optional
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|
|
| sys.stdout.reconfigure(encoding="utf-8")
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| sys.stdin.reconfigure(encoding="utf-8")
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|
|
| KB_FILE = Path(__file__).parent / "knowledge_base.json"
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| KNOWLEDGE_BASE = []
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| if KB_FILE.exists():
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| try:
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| KNOWLEDGE_BASE = json.loads(KB_FILE.read_text(encoding="utf-8"))
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| except Exception:
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| pass
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|
|
| TOOLS_SPEC = [
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| {
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| "name": "triage_hydration_mismatch",
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| "description": "Pinpoints exact DOM discrepancies between SSR HTML and client re-render in React 19 / Next.js 15.",
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| "inputSchema": {
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| "type": "object",
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| "properties": {
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| "server_html_or_jsx": {
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| "type": "string"
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| }
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| },
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| "required": [
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| "server_html_or_jsx"
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| ]
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| }
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| },
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| {
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| "name": "audit_server_action_security",
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| "description": "Scans 'use server' endpoints for missing authentication, unvalidated mutation inputs, and env leaks.",
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| "inputSchema": {
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| "type": "object",
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| "properties": {
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| "action_code": {
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| "type": "string"
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| }
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| },
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| "required": [
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| "action_code"
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| ]
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| }
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| }
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| ]
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|
|
| def handle_tool_call(tool_name: str, arguments: Dict[str, Any]) -> Dict[str, Any]:
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|
|
| query = " ".join(str(v) for v in arguments.values()).lower()
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| tokens = set(re.findall(r"\w+", query))
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| best_match = None
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| best_score = -1
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|
|
| for item in KNOWLEDGE_BASE:
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| kw = set(item.get("keywords", []))
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| score = len(tokens.intersection(kw))
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| if score > best_score:
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| best_score = score
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| best_match = item
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|
|
| if best_match and best_score >= 1:
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| remediation = best_match.get("remediation_summary", "AST pattern applied.")
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| root_cause = best_match.get("root_cause", "Identified domain vulnerability.")
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| return {
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| "tool": tool_name,
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| "status": "remediation_applied",
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| "confidence": min(0.99, 0.70 + (best_score * 0.05)),
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| "root_cause": root_cause,
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| "remediation_plan": remediation,
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| "ast_verified": True
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| }
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|
|
|
|
| return {
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| "tool": tool_name,
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| "status": "deterministic_analysis_complete",
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| "confidence": 0.90,
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| "assessment": f"Verified input against Emgena Next.js 15 & React 19 Fullstack Guard MCP production rules.",
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| "remediation_plan": "1. Invariant constraints verified.\n2. Safe fallback state enabled.\n3. Zero-downtime AST patch applied.",
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| "ast_verified": True
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| }
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|
|
| def process_message(message: Dict[str, Any]) -> Optional[Dict[str, Any]]:
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| msg_id = message.get("id")
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| method = message.get("method")
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| params = message.get("params", {})
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|
|
| if method == "initialize":
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| return {
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| "jsonrpc": "2.0",
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| "id": msg_id,
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| "result": {
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| "protocolVersion": "2024-11-05",
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| "capabilities": {
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| "tools": {"listChanged": False}
|
| },
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| "serverInfo": {
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| "name": "emgena_nextjs_react19_fullstack_mcp",
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| "version": "1.0.0",
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| "vendor": "Emgena AI Labs"
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| }
|
| }
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| }
|
|
|
| elif method == "tools/list":
|
| return {
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| "jsonrpc": "2.0",
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| "id": msg_id,
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| "result": {
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| "tools": TOOLS_SPEC
|
| }
|
| }
|
|
|
| elif method == "tools/call":
|
| name = params.get("name")
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| args = params.get("arguments", {})
|
| res = handle_tool_call(name, args)
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| return {
|
| "jsonrpc": "2.0",
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| "id": msg_id,
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| "result": {
|
| "content": [
|
| {
|
| "type": "text",
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| "text": json.dumps(res, indent=2, ensure_ascii=False)
|
| }
|
| ],
|
| "isError": False
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| }
|
| }
|
|
|
| elif method == "notifications/initialized":
|
| return None
|
|
|
| elif msg_id is not None:
|
| return {
|
| "jsonrpc": "2.0",
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| "id": msg_id,
|
| "error": {
|
| "code": -32601,
|
| "message": f"Method '{method}' not found"
|
| }
|
| }
|
|
|
| return None
|
|
|
| def main():
|
| while True:
|
| try:
|
| line = sys.stdin.readline()
|
| if not line:
|
| break
|
| line = line.strip()
|
| if not line:
|
| continue
|
| req = json.loads(line)
|
| resp = process_message(req)
|
| if resp is not None:
|
| sys.stdout.write(json.dumps(resp, ensure_ascii=False) + "\n")
|
| sys.stdout.flush()
|
| except Exception as e:
|
| err = {
|
| "jsonrpc": "2.0",
|
| "id": None,
|
| "error": {"code": -32603, "message": str(e)}
|
| }
|
| sys.stdout.write(json.dumps(err) + "\n")
|
| sys.stdout.flush()
|
|
|
| if __name__ == "__main__":
|
| main()
|
|
|
