如何使用 python flask 创建下载 API 以下载文件

Question

我有一个 python 代码，可以从 azure blob 存储中下载 url 图像文件。如果我们在浏览器中复制粘贴此 url，它只会下载文件。我必须创建一个下载 api ，调用它时只会下载文件。以下是我目前拥有的代码：

from urllib.request import urlopen
from flask import Flask, jsonify
import uuid
from flask_cors import CORS
from datetime import datetime
from azure.storage.blob import generate_blob_sas, AccountSasPermissions
import datetime
from datetime import timedelta


app = Flask(__name__)
CORS(app)

uid_secret_key = str(uuid.uuid4())

app.secret_key = uid_secret_key

# Make the WSGI interface available at the top level so wfastcgi can get it.
wsgi_app = app.wsgi_app


@app.route('/download')
def download():
    account_name = "deeusblobstorage"
    container_name = "rperodct"
    blob_name = "face_1_7285.jpg"
    account_key = "hMlIRXCjAomfDRfied8Y5FPwTVnWEkEDuVsw//CQtkiOdcFD/y5wUcxH9Ou7Ni+DtDQFwe23YbZ3Qia9gw=="
    url = f"https://{account_name}.blob.core.windows.net/{container_name}/{blob_name}"
    sas_token = generate_blob_sas(
        account_name=account_name,
        account_key=account_key,
        container_name=container_name,
        blob_name=blob_name,
        permission=AccountSasPermissions(read=True),
        expiry=datetime.datetime.utcnow() + timedelta(hours=1)
    )

    url_with_sas = f"{url}?{sas_token}"
    print(url_with_sas)
    urlopen(url_with_sas)


@app.route('/')
def hello_world():
    return jsonify({'Status': 'ok', 'date': '05.25.21'}), 200


if __name__ == '__main__':
    import os

    HOST = os.environ.get('SERVER_HOST', 'localhost')
    try:
        PORT = int(os.environ.get('SERVER_PORT', '5555'))
    except ValueError:
        PORT = 5555
    app.run(HOST, PORT)

/download api 包含从变量名 url_with_sas 中的 azure 容器下载 url blob 的代码。现在我想以这样的方式制作这个 API，如果我们点击它，它应该自动从 url 下载文件。所以为此我想到了添加 urlopen(url_with_sas) 这将打开 url。但似乎它不起作用。任何人都可以为此提出一些建议。谢谢

Answer 1

如评论中所述，解决方案是通过 return redirect(url_with_sas) 所以整个函数看起来像这样：

@app.route('/download')
def download():
    account_name = "deeusblobstorage"
    container_name = "rperodct"
    blob_name = "face_1_7285.jpg"
    account_key = "hMlIRXCjAomfDRfied8Y5FPwTVnWEkEDuVsw//CQtkiOdcFD/y5wUcxH9Ou7Ni+DtDQFwe23YbZ3Qia9gw=="
    url = f"https://{account_name}.blob.core.windows.net/{container_name}/{blob_name}"
    sas_token = generate_blob_sas(
        account_name=account_name,
        account_key=account_key,
        container_name=container_name,
        blob_name=blob_name,
        permission=AccountSasPermissions(read=True),
        expiry=datetime.datetime.utcnow() + timedelta(hours=1)
    )

    url_with_sas = f"{url}?{sas_token}"
    return redirect(url_with_sas)

如何使用 python flask 创建下载 API 以下载文件

How to create download API to download files using python flask

python

api

download

flask