4.8 KiB
Installing debshots
The easiest way to deploy the application is using Ansible.
Take a Debian Stretch server (8 GB RAM recommended).
Install PIP to get a recent version of Ansible:
apt install python-pip
pip install ansible
Run the Ansible playbook that comes with the debshots repository:
cd ansible
ansible-playbook debshots.yml
Check out the project repository from https://salsa.debian.org/debian/debshots
Change to the ansible subdirectory and run the main playbook:
cd ansible
ansible-playbook debshots.yml
This will install PostgreSQL and Nginx, create a database, create a system user and do various configuration.
Make sure that you set the environment variables as described in README.SSO.md before you start the Rails application. Otherwise most single sign-on providers cannot work. You also need to get the https://salsa.debian.org/debsso-team/debsso/raw/master/update-debsso-ca script and run it in /etc/nginx to update the certficate and CRL used by the Debian single-sign-on provider.
The production configuration uses Nginx that decrypts HTTPS and either serves static assets (images, Javascript, CSS) itself or requests for dynamic content to the Rails application. You will need a SSL certificate for Nginx. Just get one from LetsEncrypt using the certbot tool.
Finally create an admin user for moderation:
Start a Rails console:
rails c -e production
Create a new user record:
user = User.create(realname: 'Christoph Haas', password: 'foobartest', email: 'email@christoph-haas.de')
user.save!
Cron jobs
Parse Nginx access logs to count the number of visits of each package:
RAILS_ENV=production bundle exec rake debshots:accesslog2visits[/var/log/nginx/cache-access.log.1]
As a cron job:
41 9 * * * cd $HOME/debshots ; RAILS_ENV=production /home/debshots/.rbenv/shims/bundle exec rake debshots:accesslog2visits[/var/log/nginx/cache-access.log.1]
Authentication
This web application tries to avoid to create yet another directory of user accounts. So it leverages other common web sites like StackExchange, Debian SSO (using browser/client certificates) or GitHub as single-sign-on services. It is still possible to create local user accounts for administrators but registration is disabled.
Anonymous uploads are possible but they have to be moderated by an administrator.
Authorization
A user can have one of these access levels.
Anonymous
Without authentication all user actions are moderated. Such users can upload screenshots or report existing/published screenshots as inappropriate. However a user with level 'admin' will have to approve that action.
Authenticated by single-sign-login (SSO)
Users can use different authentication services to login - like Github or StackExchange. Such users internally get an account with a random password created but they will keep logging in via SSO.
The first upload will have to be moderated. Subsequent uploads will be approved automatically.
Authenticated by Debian signle-sign-login (SSO)
If a user authenticates using a Debian SSO client certificate they will be able to upload screenshots without moderation. (Anohter idea was to restrict them to uploading only screenshots for the packages they maintain. But that may be reliable and is not implemented at this time.)
Administrator
Such a user has an internal user account. The database record has the 'admin' field set to 1. Admins can freely upload, moderate and delete screenshots. They can also read the log files.
Nginx during development
During development it is advised to run Nginx to proxy ports 3000 (HTTP) and 3001 (HTTPS) to the rails application.
cd nginx
nginx -c `pwd`/nginx.conf
The SSL certitificate is just a self-signed certificate with the common name "localhost". It was generated using:
openssl req -x509 -newkey 4096 -nodes -keyout localhost.key -out localhost.crt -days 3650
Run "rails s" in another window. That will use the built-in Ruby 'Puma' application server that can also be used in production. It requires less configuration than Phusion Passenger but may be slower in regard to performance and multi-threading / multi-core support.
If you get "400 Bad Request / The SSL certificate error" in the browser then please check the error log (/tmp/error*). Once cause is that the CRL of the Debian SSO has expired and needs to be updated.
Tidy up the screenshot data:
bundle exec rake debshots:remove_broken_screenshots
bundle exec rake debshots:remove_duplicate_images
Frequent update of Debian SSO certificate
Run /etc/nginx/update-sso-ca regularly to update the CA certificate and the CRL. The CRL (certificate revocation list) is only valid for three days. So make sure you have a daily cron job for the updates. Do not forget to restart Nginx afterwards.
Otherwise you will end up with this error message:
400 Bad Request
The SSL certificate error
nginx