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The web interface, based on the popular YT-DL to download YT videos, just for LEARNING web development purposes. It is not recommended for real production at scale.

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Convertca.com

The idea is to practice some modern web technologies such as Flask, VueJS, Webpack, Bootstrap ... to develop a web application then deploy it to Google Compute Engine (GCE), with Google DataStore in robust ways. The main function of the app is to convert an online video from youtube or other services to MP3 with some addtional features:

  • Facebook authorization
  • Save the converted file to DropBox

Requirements

  • Python 3 and packages in requirements.txt
  • Node, npm and packages in web/static/package.json (for development)
  • Nginx for reserve proxy server
  • Google Cloud account (for experimenting with logging service)
  • Facebook Developer account

Set Up

  1. Create an VM instance on Google Compute Engine

  2. Install required packages

     sudo apt install software-properties-common python3 python3-venv python-pip python3-pip python-pip python3-dev git nodejs npm openssl build-essential libssl-dev libffi-dev libpq-dev ffmpeg virtualenv direnv nginx
    
  3. Git clone

  4. Create virtual environment (inside the app directory) python -m venv env

  5. Install and configure 'direnv` with the current shell, follow this instruction.

  6. Create .envrc file

     source env/bin/activate
     export LANG="en_US.UTF-8"
     export FLASK_APP="web"
     export FLASK_ENV="production"
     export FLASK_ROOT_URL="[your-web-url]"
     export SECRET_KEY="[your-secret-key]"      
     export SOCKET_URI="[your-websocket-uri]"        
     export FACEBOOK_OAUTH_CLIENT_ID="[your-fb-app-id]"
     export FACEBOOK_OAUTH_CLIENT_SECRET="[your-fb-app-secret]"
     export YOUTUBE_API_KEY="[your-youtube-api-key]"
     export GOOGLE_APPLICATION_CREDENTIALS="[path to google cloud json file]"
     export GOOGLE_OAUTH_CLIENT_ID="[...]"
     export GOOGLE_OAUTH_CLIENT_SECRET="[...]"
     export OAUTHLIB_RELAX_TOKEN_SCOPE="True"
     export OAUTHLIB_INSECURE_TRANSPORT="True"        
     export MAIL_USERNAME="[your-email-address]"
     export MAIL_PASSWORD="[https://support.google.com/mail/answer/185833?hl=en-GB]"
     export MAIL_SENDER="[...]"
     export APP_PWD="[your-app-root-directory]"       
     export DATABASE_URL="[your-postgresql-uri-with-password]"
     gcloud config set project [your-google-cloud-project-id]
    
  7. Install Python dependencies 'pip install -r config/requirements.txt`

  8. Create Postgres DB

     CREATE DATABASE converter;
     CREATE USER converter WITH ENCRYPTED PASSWORD 'password';
     GRANT ALL PRIVILEGES ON DATABASE converter TO converter;
    

Congiguration For Production

  • Run gcloud init to configure Google Cloud SDK authentication

  • Create Google cloud service account key then fille the name to GOOGLE_APPLICATION_CREDENTIALS | .envrc

  • Enable logging service

  • Get YOUTUBE_API_KEY | .envrc

  • Create Datastore entity

  • Run command to create indexes gcloud datastore indexes create config/index.yaml

  • Generate app SECRET_KEY by this command python -c 'import os; print(os.urandom(16)) | config.py

  • Get FACEBOOK_OAUTH_CLIENT_ID & FACEBOOK_OAUTH_CLIENT_SECRET | .envrc

  • Modify app root path & domain name then include the conf file config/nginx.conf into /etc/nginx/nginx.conf

      ...
      server_name  converter.techika.com;
      error_log    /home/truong/converter/logs/nginx_error.log;
      ...
    
      location /static/ {
          alias /home/truong/converter/web/static/;
      }
      location /files/ {
          alias /home/truong/converter/web/files;
      }
    
  • Start gunicorn server supervisord -c config/supervisor.conf

  • Configure SSL sudo apt install software-properties-common sudo apt install certbot python-certbot-nginx sudo certbot --nginx -d your_domain -d www.your_domain

  • Set-up Mail Account then fill in MAIL_USERNAME,MAIL_PASSWORD,MAIL_SENDER, Gmail will be used in this case for the sake of expediency. | .envrc

  • Run deploy.sh to migrate Postgresql DB

Local Development

  • brew install ffmpeg
  • Run gunicorn wsgi:app (port 8000)
  • Run python server.py (websocket server)
  • Run Postgres DB instance.

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The web interface, based on the popular YT-DL to download YT videos, just for LEARNING web development purposes. It is not recommended for real production at scale.

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