Programmatically get access_token from OAuth - Using JIRA-Ruby gem - ruby

Question

I'm trying to write a JIRA-ruby script (only be used from command-line) to mark some JIRA issue closed automatically.
I borrow an example from here because I'm using 'jira-ruby' gem.
This works however it will pop-up a browser asking you to click "Allow" to get the access_token. I would like to do this programmatically, but I don't think the API was built for this purpose. As access_token changes every time, and this script will run periodically in a cronjob, so we need to have a way to do this. Any idea what other ways we can do this?
require 'jira'
#jira = JIRA::Client.new({:site => 'http://localhost:2990', :context_path => '/jira', :consumer_key => 'test-jira', :private_key_file => "rsakey.pem"})
if ARGV.length == 0
# If not passed any command line arguments, open a browser and prompt the
# user for the OAuth verifier.
request_token = #jira.request_token
puts "Opening #{request_token.authorize_url}"
system "open #{request_token.authorize_url}"
puts "Enter the oauth_verifier: "
oauth_verifier = gets.strip
access_token = #jira.init_access_token(:oauth_verifier => oauth_verifier)
puts "Access token: #{access_token.token} secret: #{access_token.secret}"
elsif ARGV.length == 2
# Otherwise assume the arguments are a previous access token and secret.
access_token = #jira.set_access_token(ARGV[0], ARGV[1])
else
# Script must be passed 0 or 2 arguments
raise "Usage: #{$0} [ token secret ]"
end
# Show all projects
projects = #jira.Project.all
projects.each do |project|
puts "Project -> key: #{project.key}, name: #{project.name}"
end
issue = #jira.Issue.find('DEMO-1')
puts issue
I know there's a way to use long-life access tokens, but not really use if Jira supports it.

Answer 1

I was using the jira-ruby gem at first but I found the performance terrible. I ended up just going with curl instead as I only needed to require the JSON gem which is less bloated. Have your Jira administrators create a user that will never have the password change with admin access and then do the following to find "DEMO-1"
require 'json'
username = "admin"
password = "abc123"
issue = JSON.parse(%x[curl -u #{username}:#{password} \"http://jira/rest/api/latest/issue/DEMO-1\"])
Here is a link to the Jira REST API documentation, just choose the same version of Jira you are using. This will bypass any issues with oauth and the pop-up.