MVP сайта
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Даниил
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"""FastAPI application: server-rendered pages and small progressive-enhancement APIs."""
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import secrets
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from urllib.parse import parse_qs
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from fastapi import FastAPI, Request
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from starlette.responses import HTMLResponse, RedirectResponse, JSONResponse, Response
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from starlette.staticfiles import StaticFiles
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from .config import Settings
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from .repository import Repository, NotFound, Conflict
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from .auth import Auth, Unauthorized, RateLimited
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from .web import render, public_page, ROOT
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class Boundary:
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def __init__(self,app,auth): self.app=app; self.auth=auth
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async def __call__(self,scope,receive,send):
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if scope['type']!='http': return await self.app(scope,receive,send)
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headers={k.decode().lower():v.decode() for k,v in scope.get('headers',[])}
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changing=scope.get('method') in ('POST','PUT','PATCH','DELETE')
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if changing:
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if headers.get('origin','').rstrip('/') not in self.auth.settings.origins:
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return await JSONResponse({'error':'Недопустимый источник запроса'},403)(scope,receive,send)
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if scope['path'].startswith('/api/admin/'):
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try: token=self.auth.from_headers(headers)
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except Unauthorized:
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return await JSONResponse({'error':'Войдите в кабинет'},401)(scope,receive,send)
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if not self.auth.valid_csrf(token,headers.get('x-csrf-token','')):
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return await JSONResponse({'error':'Обновите страницу кабинета'},403)(scope,receive,send)
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limit=self.auth.settings.max_bytes+65536 if scope['path'] in ('/api/admin/import','/api/admin/inspect') else 1024*1024
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try: declared=int(headers.get('content-length','0'))
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except ValueError: return await Response(status_code=400)(scope,receive,send)
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if declared>limit: return await JSONResponse({'error':'Файл или запрос слишком большой'},413)(scope,receive,send)
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body=bytearray()
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while True:
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event=await receive()
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if event['type']=='http.disconnect': return
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body.extend(event.get('body',b''))
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if len(body)>limit: return await JSONResponse({'error':'Файл или запрос слишком большой'},413)(scope,receive,send)
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if not event.get('more_body',False): break
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async def replay(): return {'type':'http.request','body':bytes(body),'more_body':False}
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return await self.app(scope,replay,send)
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await self.app(scope,receive,send)
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def create_app(settings=None):
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settings=settings or Settings.from_env()
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repo=Repository(settings.data_dir);auth=Auth(settings,repo)
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app=FastAPI(title='Parser Lab',docs_url=None,redoc_url=None,openapi_url=None)
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app.state.repo=repo;app.state.auth=auth
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app.add_middleware(Boundary,auth=auth)
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app.mount('/static',StaticFiles(directory=ROOT/'static'),name='static')
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@app.exception_handler(ValueError)
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async def value_error(request,error):
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status=404 if isinstance(error,NotFound) else 409 if isinstance(error,Conflict) else 400
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if request.url.path.startswith('/api/') or request.query_params.get('fragment'):
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return JSONResponse({'error':str(error)},status)
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return HTMLResponse(render('error.html',message=str(error)),status)
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@app.exception_handler(Unauthorized)
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async def unauthorized(request,error):
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if request.url.path.startswith('/api/'): return JSONResponse({'error':str(error)},401)
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return RedirectResponse('/login',303)
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@app.get('/healthz')
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async def health():
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with repo.connect() as db: db.execute('SELECT 1').fetchone()
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return {'status':'ok'}
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@app.get('/')
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async def home(): return HTMLResponse(render('home.html'))
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@app.get('/login')
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async def login_page():
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nonce=secrets.token_urlsafe(32)
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response=HTMLResponse(render('login.html',csrf=auth.csrf(nonce)))
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response.set_cookie('lab_login',nonce,httponly=True,secure=settings.secure_cookie,samesite='strict',max_age=600)
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response.headers['Cache-Control']='no-store'
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return response
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@app.post('/login')
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async def login(request:Request):
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raw=await request.body()
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if len(raw)>8192:return Response(status_code=413)
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form={k:v[0] for k,v in parse_qs(raw.decode()).items()}
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nonce=request.cookies.get('lab_login','')
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if not auth.valid_csrf(nonce,form.get('csrf','')):return Response('Обновите страницу входа',status_code=403)
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try:token=auth.login(form.get('username',''),form.get('password',''),request.client.host)
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except (Unauthorized,RateLimited) as e:
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return HTMLResponse(render('login.html',csrf=auth.csrf(nonce),error=str(e)),429 if isinstance(e,RateLimited) else 401)
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response=RedirectResponse('/admin',303)
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response.set_cookie('lab_session',token,httponly=True,secure=settings.secure_cookie,samesite='strict',max_age=43200)
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response.delete_cookie('lab_login')
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return response
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@app.post('/logout')
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async def logout(request:Request):
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token=auth.from_headers(request.headers)
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form=parse_qs((await request.body()).decode())
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if not auth.valid_csrf(token,form.get('csrf',[''])[0]):return Response(status_code=403)
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auth.logout(token)
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response=RedirectResponse('/login',303);response.delete_cookie('lab_session')
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return response
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async def serve(request,slug,version,kind,record_id=None,mode='html'):
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p=repo.publication(slug,version)
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return public_response(request,p,kind,f'/{mode}/{slug}/v/{version}/{kind}',record_id,False,mode=='interactive')
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def public_response(request,p,kind,base,record_id=None,preview=False,live=False):
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page=int(request.query_params.get('page','1'))
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search=request.query_params.get('q',''); category=request.query_params.get('category') or None
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if request.query_params.get('fragment')=='1' and live:
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from .query import select_records
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from .web import records_fragment
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view=p['views'].get(kind)
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if view is None:raise NotFound('Представление не найдено')
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result=select_records(p['records'],view,page,search,category)
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return JSONResponse({'html':records_fragment(result['items'],kind,base),'total':result['total'],
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'has_next':result['has_next'],'page':page},headers={'Cache-Control':'no-store'})
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return HTMLResponse(public_page(p,kind,base,page,search,category,record_id,preview,live),headers={'Cache-Control':'no-store'})
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@app.get('/html/{slug}/v/{version}/{kind}')
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async def listing(request:Request,slug:str,version:int,kind:str):return await serve(request,slug,version,kind)
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@app.get('/html/{slug}/v/{version}/{kind}/records/{record_id}')
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async def detail(request:Request,slug:str,version:int,kind:str,record_id:str):return await serve(request,slug,version,kind,record_id)
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@app.get('/interactive/{slug}/v/{version}/{kind}')
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async def interactive(request:Request,slug:str,version:int,kind:str):return await serve(request,slug,version,kind,mode='interactive')
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@app.get('/interactive/{slug}/v/{version}/{kind}/records/{record_id}')
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async def interactive_detail(request:Request,slug:str,version:int,kind:str,record_id:str):return await serve(request,slug,version,kind,record_id,'interactive')
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@app.get('/preview/{ident}/{kind}')
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async def preview(request:Request,ident:str,kind:str):
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auth.from_headers(request.headers)
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return public_response(request,repo.get(ident),kind,f'/preview/{ident}/{kind}',preview=True)
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@app.get('/preview/{ident}/{kind}/records/{record_id}')
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async def preview_detail(request:Request,ident:str,kind:str,record_id:str):
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auth.from_headers(request.headers)
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return public_response(request,repo.get(ident),kind,f'/preview/{ident}/{kind}',record_id,True)
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@app.get('/dynamic-preview/{ident}/{kind}')
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async def dynamic_preview(request:Request,ident:str,kind:str):
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auth.from_headers(request.headers)
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return public_response(request,repo.get(ident),kind,f'/dynamic-preview/{ident}/{kind}',preview=True,live=True)
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@app.get('/dynamic-preview/{ident}/{kind}/records/{record_id}')
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async def dynamic_detail(request:Request,ident:str,kind:str,record_id:str):
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auth.from_headers(request.headers)
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return public_response(request,repo.get(ident),kind,f'/dynamic-preview/{ident}/{kind}',record_id,True,True)
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from .admin import install_admin
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install_admin(app,auth,repo,settings)
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return app
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