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feat: serveur MCP Forgejo (4 tools lecture) + demarrage auto

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Bastien Gourdon
2026-07-20 17:27:02 +02:00
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#!/usr/bin/env python3
"""
mcp_forgejo_server.py — Serveur MCP pur Starlette (compatible Python 3.9)
Acces en lecture aux depots Forgejo via le protocole MCP (JSON-RPC 2.0).
Calque sur ~/App/Context_continuity/mcp_server.py :
transport Streamable HTTP sur /mcp, auth Bearer (tokens statiques + OAuth 2.1
avec PKCE), etat OAuth isole dans oauth_state_forgejo.json.
Usage : python3 mcp_forgejo_server.py -> ecoute sur 127.0.0.1:8770
Variables .env requises :
FORGEJO_URL (defaut http://localhost:3000)
FORGEJO_TOKEN token d'API Forgejo, permissions lecture repo
API_KEY_CLAUDE token statique Claude
API_KEY_LECHAT token statique Le Chat
OAUTH_BASE_URL defaut https://mcp-forgejo.bertha-cloud.fr
SECURITY_WORD mot de securite de la page /authorize
"""
import os
import json
import secrets
import hashlib
import base64
import time
import requests
from dotenv import load_dotenv
from starlette.applications import Starlette
from starlette.routing import Route
from starlette.requests import Request
from starlette.responses import JSONResponse, Response, HTMLResponse, RedirectResponse
load_dotenv()
# --- Configuration Forgejo ---
FORGEJO_URL = os.getenv("FORGEJO_URL", "http://localhost:3000")
FORGEJO_TOKEN = os.getenv("FORGEJO_TOKEN", "")
if not FORGEJO_TOKEN:
raise ValueError("FORGEJO_TOKEN doit etre defini (token d'API Forgejo, acces lecture).")
# --- Auth MCP ---
API_KEY_CLAUDE = os.getenv("API_KEY_CLAUDE", "")
API_KEY_LECHAT = os.getenv("API_KEY_LECHAT", "")
VALID_TOKENS = {}
if API_KEY_CLAUDE:
VALID_TOKENS[API_KEY_CLAUDE] = "Claude"
if API_KEY_LECHAT:
VALID_TOKENS[API_KEY_LECHAT] = "LeChat"
PROTOCOL_VERSION = "2025-06-18"
SERVER_INFO = {"name": "Forgejo Code Access", "version": "1.0.0"}
# --- Config OAuth 2.1 (etat isole du serveur Trilium) ---
OAUTH_BASE_URL = os.getenv("OAUTH_BASE_URL", "https://mcp-forgejo.bertha-cloud.fr")
SECURITY_WORD = os.getenv("SECURITY_WORD", "")
OAUTH_STATE_FILE = os.path.expanduser("~/App/Code_versioning/oauth_state_forgejo.json")
def load_oauth_state():
if not os.path.exists(OAUTH_STATE_FILE):
return {"clients": {}, "auth_codes": {}, "tokens": {}}
with open(OAUTH_STATE_FILE) as f:
state = json.load(f)
state.setdefault("clients", {})
state.setdefault("auth_codes", {})
state.setdefault("tokens", {})
return state
def save_oauth_state(state):
with open(OAUTH_STATE_FILE, "w") as f:
json.dump(state, f, indent=2)
# ---------------------------------------------------------------------------
# Helper API Forgejo
# ---------------------------------------------------------------------------
def forgejo_api(method, endpoint, **kwargs):
"""Appel generique a l'API Forgejo."""
url = "%s/%s" % (FORGEJO_URL.rstrip("/"), endpoint.lstrip("/"))
headers = {"Authorization": "token %s" % FORGEJO_TOKEN}
response = requests.request(method, url, headers=headers, timeout=30, **kwargs)
response.raise_for_status()
return response.json() if response.content else None
# ---------------------------------------------------------------------------
# Definition des tools (schema JSON)
# ---------------------------------------------------------------------------
TOOLS = [
{
"name": "list_repos",
"description": "Liste tous les depots Forgejo accessibles avec le token (nom complet, description, branche par defaut, visibilite).",
"inputSchema": {
"type": "object",
"properties": {},
"required": [],
},
},
{
"name": "list_files",
"description": "Liste les fichiers et dossiers d un depot a un chemin donne. repo au format proprietaire/depot (ex: Master/sliding-automation). path vide = racine.",
"inputSchema": {
"type": "object",
"properties": {
"repo": {"type": "string", "description": "proprietaire/depot"},
"path": {"type": "string", "description": "Chemin dans le depot (defaut: racine)"},
"ref": {"type": "string", "description": "Branche, tag ou commit (defaut: branche par defaut)"},
},
"required": ["repo"],
},
},
{
"name": "read_file",
"description": "Lit le contenu texte d un fichier d un depot. repo au format proprietaire/depot. Refuse les fichiers binaires et ceux depassant la taille limite.",
"inputSchema": {
"type": "object",
"properties": {
"repo": {"type": "string", "description": "proprietaire/depot"},
"path": {"type": "string", "description": "Chemin du fichier dans le depot"},
"ref": {"type": "string", "description": "Branche, tag ou commit (defaut: branche par defaut)"},
},
"required": ["repo", "path"],
},
},
{
"name": "get_metadata",
"description": "Metadonnees d un fichier (taille, sha, type, urls) sans telecharger le contenu. Utile avant de lire un gros fichier.",
"inputSchema": {
"type": "object",
"properties": {
"repo": {"type": "string", "description": "proprietaire/depot"},
"path": {"type": "string", "description": "Chemin du fichier dans le depot"},
"ref": {"type": "string", "description": "Branche, tag ou commit (defaut: branche par defaut)"},
},
"required": ["repo", "path"],
},
},
]
# ---------------------------------------------------------------------------
# Implementation des tools
# ---------------------------------------------------------------------------
MAX_FILE_BYTES = 200000 # garde-fou : au-dela, on renvoie les metadonnees
def _valider_repo(repo):
"""Le format attendu est proprietaire/depot. Evite les traversees de chemin."""
if not repo or repo.count("/") != 1:
return {"error": "repo doit etre au format proprietaire/depot (ex: Master/sliding-automation)"}
if ".." in repo:
return {"error": "repo invalide"}
return None
def _valider_path(path):
if path and ".." in path:
return {"error": "path invalide (traversee de repertoire)"}
return None
def tool_list_repos():
repos = forgejo_api("GET", "/api/v1/user/repos") or []
return [{
"full_name": r.get("full_name"),
"description": r.get("description") or "",
"default_branch": r.get("default_branch"),
"private": r.get("private"),
"updated_at": r.get("updated_at"),
"size_kb": r.get("size"),
} for r in repos]
def tool_list_files(repo, path="", ref=None):
err = _valider_repo(repo) or _valider_path(path)
if err:
return err
params = {"ref": ref} if ref else None
data = forgejo_api("GET", "/api/v1/repos/%s/contents/%s" % (repo, path.lstrip("/")), params=params)
if isinstance(data, dict):
data = [data]
return [{
"name": e.get("name"),
"path": e.get("path"),
"type": e.get("type"),
"size": e.get("size"),
} for e in (data or [])]
def tool_read_file(repo, path, ref=None):
err = _valider_repo(repo) or _valider_path(path)
if err:
return err
params = {"ref": ref} if ref else None
data = forgejo_api("GET", "/api/v1/repos/%s/contents/%s" % (repo, path.lstrip("/")), params=params)
if not data or data.get("type") != "file":
return {"error": "Fichier introuvable ou chemin non fichier : %s" % path}
size = data.get("size") or 0
if size > MAX_FILE_BYTES:
return {"error": "Fichier trop volumineux (%d octets, limite %d). Utiliser get_metadata." % (size, MAX_FILE_BYTES),
"path": path, "repo": repo, "size": size}
encoded = data.get("content")
if encoded and data.get("encoding") == "base64":
raw = base64.b64decode(encoded)
else:
dl = requests.get(data["download_url"],
headers={"Authorization": "token %s" % FORGEJO_TOKEN},
timeout=30)
dl.raise_for_status()
raw = dl.content
try:
content = raw.decode("utf-8")
except UnicodeDecodeError:
return {"error": "Fichier binaire, lecture texte impossible", "path": path, "repo": repo}
return {"repo": repo, "path": path, "ref": ref or data.get("ref"),
"size": size, "sha": data.get("sha"), "content": content}
def tool_get_metadata(repo, path, ref=None):
err = _valider_repo(repo) or _valider_path(path)
if err:
return err
params = {"ref": ref} if ref else None
data = forgejo_api("GET", "/api/v1/repos/%s/contents/%s" % (repo, path.lstrip("/")), params=params)
if not data:
return {"error": "Introuvable : %s" % path}
if isinstance(data, list):
return {"repo": repo, "path": path, "type": "dir", "entries": len(data)}
return {
"repo": repo,
"path": data.get("path"),
"type": data.get("type"),
"size": data.get("size"),
"sha": data.get("sha"),
"encoding": data.get("encoding"),
"html_url": data.get("html_url"),
"download_url": data.get("download_url"),
}
DISPATCH = {
"list_repos": tool_list_repos,
"list_files": tool_list_files,
"read_file": tool_read_file,
"get_metadata": tool_get_metadata,
}
# ---------------------------------------------------------------------------
# Handler JSON-RPC MCP
# ---------------------------------------------------------------------------
def check_auth(request):
auth = request.headers.get("authorization", "")
token = auth.replace("Bearer ", "").strip()
# 1) Tokens statiques (Le Chat, cle Claude historique)
if token and token in VALID_TOKENS:
return VALID_TOKENS[token]
# 2) Tokens OAuth emis (Claude Desktop)
if token.startswith("at_"):
oauth = load_oauth_state()
meta = oauth["tokens"].get(token)
if meta:
return "Claude-OAuth"
return None
async def mcp_endpoint(request: Request):
# Auth
llm = check_auth(request)
if not llm:
return JSONResponse(
{"error": "invalid_token", "error_description": "Authentication required"},
status_code=401,
headers={"WWW-Authenticate": "Bearer"},
)
body = await request.json()
method = body.get("method")
req_id = body.get("id")
params = body.get("params", {})
# initialize
if method == "initialize":
return JSONResponse({
"jsonrpc": "2.0", "id": req_id,
"result": {
"protocolVersion": PROTOCOL_VERSION,
"capabilities": {"tools": {}},
"serverInfo": SERVER_INFO,
},
})
# notifications/initialized (pas de reponse attendue)
if method == "notifications/initialized":
return Response(status_code=202)
# tools/list
if method == "tools/list":
return JSONResponse({
"jsonrpc": "2.0", "id": req_id,
"result": {"tools": TOOLS},
})
# tools/call
if method == "tools/call":
tool_name = params.get("name")
args = params.get("arguments", {})
fn = DISPATCH.get(tool_name)
if not fn:
return JSONResponse({
"jsonrpc": "2.0", "id": req_id,
"error": {"code": -32601, "message": "Tool inconnu : %s" % tool_name},
})
try:
result = fn(**args)
return JSONResponse({
"jsonrpc": "2.0", "id": req_id,
"result": {
"content": [{"type": "text",
"text": json.dumps(result, ensure_ascii=False, indent=2)}],
},
})
except requests.HTTPError as e:
status = e.response.status_code if e.response is not None else "?"
return JSONResponse({
"jsonrpc": "2.0", "id": req_id,
"error": {"code": -32603, "message": "Forgejo HTTP %s : %s" % (status, str(e))},
})
except Exception as e:
return JSONResponse({
"jsonrpc": "2.0", "id": req_id,
"error": {"code": -32603, "message": str(e)},
})
# methode inconnue
return JSONResponse({
"jsonrpc": "2.0", "id": req_id,
"error": {"code": -32601, "message": "Methode inconnue : %s" % method},
})
async def health(request: Request):
return JSONResponse({"status": "ok", "server": "mcp-forgejo", "version": "1.0.0"})
async def well_known_protected_resource(request: Request):
return JSONResponse({
"resource": OAUTH_BASE_URL + "/mcp",
"authorization_servers": [OAUTH_BASE_URL],
})
async def well_known_authorization_server(request: Request):
return JSONResponse({
"issuer": OAUTH_BASE_URL,
"authorization_endpoint": OAUTH_BASE_URL + "/authorize",
"token_endpoint": OAUTH_BASE_URL + "/token",
"registration_endpoint": OAUTH_BASE_URL + "/register",
"response_types_supported": ["code"],
"grant_types_supported": ["authorization_code", "refresh_token"],
"code_challenge_methods_supported": ["S256"],
"token_endpoint_auth_methods_supported": ["none"],
})
async def register(request: Request):
"""Dynamic Client Registration (RFC 7591)."""
try:
body = await request.json()
except Exception:
body = {}
client_id = "client_" + secrets.token_urlsafe(16)
state = load_oauth_state()
state["clients"][client_id] = {
"client_id": client_id,
"redirect_uris": body.get("redirect_uris", []),
"client_name": body.get("client_name", "unknown"),
"created_at": int(time.time()),
}
save_oauth_state(state)
return JSONResponse({
"client_id": client_id,
"redirect_uris": body.get("redirect_uris", []),
"client_name": body.get("client_name", "unknown"),
"token_endpoint_auth_method": "none",
"grant_types": ["authorization_code", "refresh_token"],
"response_types": ["code"],
}, status_code=201)
AUTHORIZE_PAGE = """<!DOCTYPE html>
<html lang="fr"><head><meta charset="utf-8"><title>Autorisation Forgejo MCP</title>
<style>body{{font-family:sans-serif;max-width:400px;margin:80px auto;padding:20px}}
input{{width:100%;padding:10px;margin:10px 0;box-sizing:border-box}}
button{{padding:10px 20px;background:#000;color:#fff;border:none;cursor:pointer}}
.err{{color:#c00}}</style></head>
<body><h2>Autorisation Forgejo MCP</h2>
<p>Saisissez le mot de securite pour autoriser l acces.</p>
{error}
<form method="POST" action="/authorize">
<input type="hidden" name="client_id" value="{client_id}">
<input type="hidden" name="redirect_uri" value="{redirect_uri}">
<input type="hidden" name="state" value="{state}">
<input type="hidden" name="code_challenge" value="{code_challenge}">
<input type="hidden" name="code_challenge_method" value="{code_challenge_method}">
<input type="password" name="security_word" placeholder="Mot de securite" autofocus>
<button type="submit">Autoriser</button>
</form></body></html>"""
async def authorize_get(request: Request):
q = request.query_params
page = AUTHORIZE_PAGE.format(
error="",
client_id=q.get("client_id", ""),
redirect_uri=q.get("redirect_uri", ""),
state=q.get("state", ""),
code_challenge=q.get("code_challenge", ""),
code_challenge_method=q.get("code_challenge_method", "S256"),
)
return HTMLResponse(page)
async def authorize_post(request: Request):
form = await request.form()
word = form.get("security_word", "")
client_id = form.get("client_id", "")
redirect_uri = form.get("redirect_uri", "")
state_param = form.get("state", "")
code_challenge = form.get("code_challenge", "")
code_challenge_method = form.get("code_challenge_method", "S256")
if not SECURITY_WORD or word != SECURITY_WORD:
page = AUTHORIZE_PAGE.format(
error='<p class="err">Mot de securite incorrect.</p>',
client_id=client_id, redirect_uri=redirect_uri,
state=state_param, code_challenge=code_challenge,
code_challenge_method=code_challenge_method,
)
return HTMLResponse(page, status_code=401)
oauth = load_oauth_state()
if client_id not in oauth["clients"]:
return JSONResponse({"error": "client inconnu"}, status_code=400)
code = "code_" + secrets.token_urlsafe(24)
oauth["auth_codes"][code] = {
"client_id": client_id,
"redirect_uri": redirect_uri,
"code_challenge": code_challenge,
"code_challenge_method": code_challenge_method,
"created_at": int(time.time()),
"used": False,
}
save_oauth_state(oauth)
sep = "&" if "?" in redirect_uri else "?"
location = redirect_uri + sep + "code=" + code
if state_param:
location += "&state=" + state_param
return RedirectResponse(location, status_code=302)
def verify_pkce(code_verifier, code_challenge):
"""Verifie PKCE S256 : base64url(sha256(verifier)) == challenge."""
digest = hashlib.sha256(code_verifier.encode("ascii")).digest()
computed = base64.urlsafe_b64encode(digest).decode("ascii").rstrip("=")
return computed == code_challenge
async def token(request: Request):
form = await request.form()
grant_type = form.get("grant_type", "")
oauth = load_oauth_state()
if grant_type == "authorization_code":
code = form.get("code", "")
code_verifier = form.get("code_verifier", "")
entry = oauth["auth_codes"].get(code)
if not entry:
return JSONResponse({"error": "invalid_grant"}, status_code=400)
if entry.get("used"):
return JSONResponse({"error": "invalid_grant", "error_description": "code deja utilise"}, status_code=400)
challenge = entry.get("code_challenge", "")
if challenge:
if not code_verifier or not verify_pkce(code_verifier, challenge):
return JSONResponse({"error": "invalid_grant", "error_description": "PKCE echec"}, status_code=400)
access_token = "at_" + secrets.token_urlsafe(32)
refresh_token = "rt_" + secrets.token_urlsafe(32)
oauth["tokens"][access_token] = {
"client_id": entry["client_id"],
"refresh_token": refresh_token,
"created_at": int(time.time()),
"type": "access",
}
oauth["auth_codes"][code]["used"] = True
save_oauth_state(oauth)
return JSONResponse({
"access_token": access_token,
"token_type": "Bearer",
"expires_in": 31536000,
"refresh_token": refresh_token,
})
elif grant_type == "refresh_token":
rt = form.get("refresh_token", "")
for at, meta in list(oauth["tokens"].items()):
if meta.get("refresh_token") == rt:
new_at = "at_" + secrets.token_urlsafe(32)
oauth["tokens"][new_at] = {
"client_id": meta["client_id"],
"refresh_token": rt,
"created_at": int(time.time()),
"type": "access",
}
save_oauth_state(oauth)
return JSONResponse({
"access_token": new_at,
"token_type": "Bearer",
"expires_in": 31536000,
"refresh_token": rt,
})
return JSONResponse({"error": "invalid_grant"}, status_code=400)
return JSONResponse({"error": "unsupported_grant_type"}, status_code=400)
app = Starlette(routes=[
Route("/mcp", mcp_endpoint, methods=["POST"]),
Route("/", mcp_endpoint, methods=["POST"]),
Route("/health", health, methods=["GET"]),
Route("/.well-known/oauth-protected-resource", well_known_protected_resource, methods=["GET"]),
Route("/.well-known/oauth-authorization-server", well_known_authorization_server, methods=["GET"]),
Route("/register", register, methods=["POST"]),
Route("/authorize", authorize_get, methods=["GET"]),
Route("/authorize", authorize_post, methods=["POST"]),
Route("/token", token, methods=["POST"]),
])
if __name__ == "__main__":
import uvicorn
uvicorn.run(app, host="127.0.0.1", port=8770)