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Azure App ServiceでFlaskアプリケーションを公開する(with AAD認証)

Last updated at Posted at 2023-07-09

目的

ChatGPTアプリをFlaskで作成したので、Azure App Serviceに置きたくなった。
Azure App Serviceならではのハマりポイントがあったのでメモ程度に残しておく

Flask DanceでAAD認証する

とりあえず必要なパッケージをいろいろ設定する。

requirements.txt
openai
jinja2
flask
Flask-Dance

アプリケーションの作りはこんな感じ

※Flask自身はHTTPで動くためredirect_urlがhttp://~になってしまうため、
class ReverseProxiedを追加してHTTPSで動いていることをFlaskに伝えとく。
ここでかなりハマった。

app.py
from flask_dance.contrib.azure import make_azure_blueprint, azure

class ReverseProxied(object):
    def __init__(self, app):
        self.app = app
    def __call__(self, environ, start_response):
        scheme = environ.get('HTTP_X_FORWARDED_PROTO')
        if scheme:
            environ['wsgi.url_scheme'] = scheme
        return self.app(environ, start_response)

app = Flask(__name__)
app.wsgi_app = ReverseProxied(app.wsgi_app)
app.secret_key = "xxxxxxxx"

blueprint = make_azure_blueprint(
    client_id = "xxxxxxxx",
    client_secret = "xxxxxxxx",
    tenant = "xxxxxxxx",
)

app.register_blueprint(blueprint, url_prefix="/login")

@app.route("/", methods=["GET"])
def index():    
    if not azure.authorized:
        return redirect(url_for("azure.login"))
    resp = azure.get("/v1.0/me")
    assert resp.ok
    ##### 処理いろいろ #####
    return render_template("index.html")

if __name__ == "__main__":
    app.run(debug=True)

Azure App Serviceの設定はこんな感じ
App Serviceはデフォルトでgunicorn経由でFlaskを動かすらしい。
image.png
スタートアップコマンド

gunicorn --bind=0.0.0.0 --timeout 600 app:app

AADへのアプリ登録は今のところ
image.png
image.png

完成したチャットアプリは今のところはこんな風
image.png

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