How to stream AES Encrypted zip files with fastAPi

poetry.lock

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pyproject.toml

[tool.poetry]
name = "zip-stream-fastapi"
version = "0.1.0"
description = ""
authors = ["Julian David Rath <julian.rath@semadox.com>"]
readme = "README.md"
packages = [{include = "zip_stream_fastapi"}]

[tool.poetry.dependencies]
python = "^3.10"
pyzipper = "^0.3.6"
fastapi = "^0.85.0"
uvicorn = "^0.18.3"
httpx = "^0.23.0"


[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

streamer.py

import io
import fastapi
from fastapi.responses import StreamingResponse
import pyzipper
from httpx import AsyncClient
from zipfile import ZipFile

app = fastapi.FastAPI()

URL = "https://cdn.pixabay.com/photo/2015/04/23/22/00/tree-736885_960_720.jpg"

PASSWORD = b"hello123"


class ReallyStupidOutput():
    def __init__(self):
        self.buf = b""
    def reset(self):
        self.buf = b""
    def write(self, buf):
        self.buf += buf
        return len(buf)
    def flush(self):
        pass


async def zip_streamer():
    output = ReallyStupidOutput()
    zip_file = pyzipper.AESZipFile(output, mode="w", encryption=pyzipper.WZ_AES)
    zip_file.setpassword(PASSWORD)
    for i in range(10):
        async with AsyncClient() as client:
            res = await client.get(URL)
            res.raise_for_status()
            zip_file.writestr(f"{i}.jpeg", res.content)
            
        
        yield output.buf
        print(f"wrote {len(output.buf)}")
        output.reset()
    zip_file.close()
    yield output.buf



@app.get("/")
async def stream_zip():
    return StreamingResponse(zip_streamer())

Use

poetry run uvicorn streamy:app --reload

to run it.