Containerize the Flask App and Run Locally

The following steps describe how to complete the Dockerization part of the project. After you complete these steps, you should have the Flask application up and running in a Docker container.

1. If you haven't installed Docker already, you should install now using these installation instructions .

2. Create a Dockerfile named Dockerfile in the app repo. Your Dockerfile should:

   • Use the python:stretch image as a source image
   • Set up an app directory for your code
   • Install needed Python requirements
   • Define an entrypoint which will run the main app using the Gunicorn WSGI server

   Gunicorn should be run with the arguments as follows: gunicorn -b :8080 main:APP .

3. Create a file named env_file and use it to set the environment variables which will be run locally in your container. Here, we do not need the export command, just an equals sign:

    <VARIABLE_NAME>=<VARIABLE_VALUE>

   In this file, you should set both JWT_SECRET and LOG_LEVEL , similar to how they were set as environment variables when you ran the Flask app locally.

4. Build a local Docker image with the tag jwt-api-test .

5. Run the image locally, using the Gunicorn server.

   • You can pass the name of the env file using the flag --env-file=<YOUR_ENV_FILENAME> .
   • You should expose the port 8080 of the container to the port 80 on your host machine.

6. To use the endpoints, you can use the same curl commands as before, except using port 80 this time:

   • To try the /auth endpoint, use the following command:

     export TOKEN=`curl -d '{"email":"<EMAIL>","password":"<PASSWORD>"}' -H "Content-Type: application/json" -X POST localhost:80/auth  | jq -r '.token'`

   • To try the /contents endpoint which decrypts the token and returns its content, run:

   curl --request GET 'http://127.0.0.1:80/contents' -H "Authorization: Bearer ${TOKEN}" | jq .

   You should see the email that you passed in as one of the values.

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