No module named 'flask_httpauth' but Requirement already satisfied

[Marchello Lippi]

Hi all, 

My GAE flask web app works fine without any auth, but when I try to add basic authentication, it starts to produce 502 Bad Gateway error. Looked into GAE logs, found error: 

> from flask_httpauth import HTTPBasicAuth

ModuleNotFoundError: No module named 'flask_httpauth'

Ok, the module might be not installed yet, so: 

> $ pip3 install flask_httpauth

Requirement already satisfied: flask_httpauth in ./.local/lib/python3.7/site-packages (4.2.0)

Requirement already satisfied: Flask in /usr/local/lib/python3.7/dist-packages (from flask_httpauth) (1.1.2)

Requirement already satisfied: click>=5.1 in /usr/local/lib/python3.7/dist-packages (from Flask->flask_httpauth) (7.0)

Requirement already satisfied: Werkzeug>=0.15 in /usr/local/lib/python3.7/dist-packages (from Flask->flask_httpauth) (1.0.1)

Requirement already satisfied: itsdangerous>=0.24 in /usr/local/lib/python3.7/dist-packages (from Flask->flask_httpauth) (1.1.0)

Requirement already satisfied: Jinja2>=2.10.1 in /usr/local/lib/python3.7/dist-packages (from Flask->flask_httpauth) (2.11.2)

Requirement already satisfied: MarkupSafe>=0.23 in /usr/local/lib/python3.7/dist-packages (from Jinja2>=2.10.1->Flask->flask_httpauth) (1.1.1)

As you can see, it was already installed before. 

Just in case, installed it for pip (not only for pip3)

> $ pip install flask_httpauth

After that I tried to call my web app again 

https://example.com?who=test1234567

but it produces the same error as above. 

My main.py code: https://pastebin.com/CNzmgQ5c

(also its code is below for your convenience)

Please advise. 

import flask

from flask import Flask

from flask import jsonify

from Flask_HTTPAuth import HTTPBasicAuth

app = flask.Flask(__name__)

auth = HTTPBasicAuth()

@app.route("/", methods=["GET"])

def hello():

        who = flask.request.args.get("who", "World")

        return f"Hello {who}!\n"

@app.route('/rest-auth')

@auth.login_required

def get_response():

        return jsonify('You are authorized to see this message')

@auth.verify_password

def authenticate(username, password):

        if username and password:

                if username == 'test' and password == '2345':

                        return True

                else:

                        return False

        return False

if __name__ == "__main__":

    app.run(host="localhost", port=8080, debug=True)

[ajorda]

Hello,

I have managed to reproduce your issue and solve it. I have noticed two points of improvement that I would like to address so that you can move forward with your application.

When you run a `pip install` command in your shell, it is only installing the package on your local machine unless you are working in a virtual environment (which is recommended) and uploading the "venv" folder (which shouldn't be done).
In order to install a dependency on GAE, you should use the "requirements.txt" file. This will allow GAE to be aware of the application's dependencies and install them by running `pip install -r requirements.txt`. This is explained in the documentation. In order to fix your issue I added the `flask_httpauth` library in the "requirements.txt" file.

Apart from that, I have noticed that the `flask_httpauth` is not properly imported in the code you provided. That causes your code to fail to execute even if the right dependency is installed. You can verify this by running `python main.py` in your local machine. In order to fix that issue I have changed the following line:

    from Flask_HTTPAuth import HTTPBasicAuth

By this one:

    from flask_httpauth import HTTPBasicAuth

After doing those changes I deployed to GAE and I was able to use your code to authenticate myself and properly access the `/rest-auth` endpoint.

Let us know if we can be of any further help.

Best regards,

Àlex J.

[Marchello Lippi]

It worked, thanks!

вівторок, 2 лютого 2021 р. о 10:59:57 UTC+2 ajorda пише: