lou
130 lines
4.3 KiB
Python
130 lines
4.3 KiB
Python
"""
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API 层 (api)
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模块: 服务端 / API 层
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输入: HTTP 请求
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输出: 响应 / 路由到各模块
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端点:
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POST /api/transfer/init {init json} -> {transfer_id}
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GET /api/transfer/{id}/chunks -> {received: [n...]}
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PUT /api/transfer/{id}/chunk/{n} 卷密文 -> {ok} / 409
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POST /api/transfer/{id}/complete -> {status, file_id} / 409
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"""
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import hashlib
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from pathlib import Path
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from fastapi import FastAPI, Request
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from fastapi.responses import FileResponse, JSONResponse
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from assembler import Assembler, AssemblerError
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from settings import KEYRING_PATH, STORAGE_ROOT, TMP_ROOT
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from db import ServerDB
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from decrypt import DecryptError, Decryptor
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from keyring import Keyring
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from receiver import Receiver, ReceiverError
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from storage import Storage
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from task_manager import TaskManager
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from unpacker import UnpackError, Unpacker
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# ---------- 依赖装配 (单例) ----------
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db = ServerDB()
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tasks = TaskManager(db)
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keyring = Keyring(KEYRING_PATH)
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receiver = Receiver(tasks, TMP_ROOT)
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assembler = Assembler(tasks, TMP_ROOT)
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unpacker = Unpacker(tasks)
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decryptor = Decryptor(keyring)
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storage = Storage(tasks, STORAGE_ROOT)
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app = FastAPI(title="7z-encrypt 服务端")
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def _sha256(path: str | Path) -> str:
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h = hashlib.sha256()
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with open(path, "rb") as f:
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for chunk in iter(lambda: f.read(1 << 20), b""):
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h.update(chunk)
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return h.hexdigest()
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@app.get("/api/files")
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async def list_files():
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"""文件列表 (ls)"""
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return {"files": db.list_files()}
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@app.get("/api/files/{file_id}")
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async def download_file(file_id: str):
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"""下载文件 (流式返回存储中的明文)"""
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rec = db.get_file(file_id)
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if rec is None:
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return JSONResponse(status_code=404, content={"error": "文件不存在"})
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path = Path(rec["path"])
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if not path.exists():
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return JSONResponse(status_code=404, content={"error": f"存储文件缺失: {path}"})
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return FileResponse(
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path,
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filename=rec["file_name"],
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media_type="application/octet-stream",
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)
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@app.post("/api/transfer/init")
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async def init_transfer(request: Request):
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try:
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init_json = await request.json()
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transfer_id = tasks.create(init_json)
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except (KeyError, TypeError, ValueError) as e:
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return JSONResponse(status_code=400, content={"error": f"init json 非法: {e}"})
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return {"transfer_id": transfer_id}
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@app.get("/api/transfer/{transfer_id}/chunks")
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async def get_chunks(transfer_id: str):
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if tasks.get(transfer_id) is None:
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return JSONResponse(status_code=404, content={"error": "任务不存在"})
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return {"received": sorted(tasks.received(transfer_id))}
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@app.put("/api/transfer/{transfer_id}/chunk/{idx}")
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async def put_chunk(transfer_id: str, idx: int, request: Request):
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if tasks.get(transfer_id) is None:
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return JSONResponse(status_code=404, content={"error": "任务不存在"})
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data = await request.body()
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try:
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receiver.receive(transfer_id, idx, data)
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except ReceiverError as e:
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return JSONResponse(status_code=409, content={"error": str(e)})
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return {"ok": True}
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@app.post("/api/transfer/{transfer_id}/complete")
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async def complete(transfer_id: str):
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if tasks.get(transfer_id) is None:
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return JSONResponse(status_code=404, content={"error": "任务不存在"})
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try:
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tasks.set_status(transfer_id, "assembling")
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merged = assembler.assemble(transfer_id)
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tasks.set_status(transfer_id, "decrypting")
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merged_path, enc_params = unpacker.unpack(transfer_id, merged)
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plain_path = TMP_ROOT / transfer_id / "plain.bin"
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decryptor.decrypt(merged_path, enc_params, plain_path)
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transfer = tasks.get(transfer_id)
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assert transfer is not None
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final_path = storage.store(plain_path, transfer["file_name"])
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file_id = db.insert_file(
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transfer_id,
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transfer["file_name"],
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str(final_path),
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final_path.stat().st_size,
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_sha256(final_path),
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)
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tasks.set_status(transfer_id, "done")
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return {"status": "done", "file_id": file_id}
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except (AssemblerError, UnpackError, DecryptError) as e:
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tasks.set_status(transfer_id, "failed")
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return JSONResponse(status_code=409, content={"error": str(e), "status": "failed"})
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