Generate 'oauth_signature' from OAUTH_CONSUMER_KEY, CONSUMER_API_SECRET, OAUTH_TOKEN, OAUTH_TOKEN_SECRET, and make a request.

api_request_twitter.rb

# e.g.: OAUTH_CONSUMER_KEY=value CONSUMER_API_SECRET=value OAUTH_TOKEN=value OAUTH_TOKEN_SECRET=value ruby api_request_twitter.rb | jq .
# OAUTH_CONSUMER_KEY = Consumer API keys - API key
# CONSUMER_API_SECRET = Consumer API keys - API secret key
# OAUTH_TOKEN = Access token & access token secret - Access token
# OAUTH_TOKEN_SECRET = Access token & access token secret - Access token secret


require "erb"
include ERB::Util
require 'uri'
require 'securerandom'
require 'openssl'
require 'base64'

params = {
  'oauth_consumer_key' => ENV['OAUTH_CONSUMER_KEY'],
  'oauth_nonce' => "#{SecureRandom.alphanumeric(42)}",
  'oauth_timestamp' => Time.now.to_i.to_s,
  'oauth_signature_method' => 'HMAC-SHA1',
  'oauth_token' => ENV['OAUTH_TOKEN'],
  'oauth_version' => '1.0',
}

# e.g.: GET request
method = 'GET'
endpoint = 'https://api.twitter.com/1.1/search/tweets.json'
query = 'q=hoge&result_type=recent'

# e.g.: POST request
# method = 'POST'
# endpoint = 'https://api.twitter.com/1.1/statuses/update.json'
# query = "status=#{ERB::Util.url_encode('hello,world')}"

query.split('&').each { |q|
  params[q.split('=')[0]] = URI.decode(q.split('=')[1])
}

encoded_params = params.keys.sort.map { |item| "#{ERB::Util.url_encode(item)}=#{ERB::Util.url_encode(params[item])}" }.join('&')
oauth_base = "#{method}&#{ERB::Util.url_encode(endpoint)}&#{ERB::Util.url_encode(encoded_params)}"
STDERR.puts '--------------------------------'
STDERR.puts "oauth_base"
STDERR.puts oauth_base

encoded_consumer_api_secret = ERB::Util.url_encode(ENV['CONSUMER_API_SECRET'])
encoded_oauth_token_secret = ERB::Util.url_encode(ENV['OAUTH_TOKEN_SECRET'])
oauth_key = "#{encoded_consumer_api_secret}&#{encoded_oauth_token_secret}"
STDERR.puts '--------------------------------'
STDERR.puts "oauth_key"
STDERR.puts oauth_key

params['oauth_signature'] = ERB::Util.url_encode(Base64.encode64(OpenSSL::HMAC.digest('sha1', oauth_key, oauth_base)).chomp)

STDERR.puts '--------------------------------'
STDERR.puts "params"
STDERR.puts params

header = params.keys.select { |item|
 ['oauth_consumer_key', 'oauth_nonce', 'oauth_timestamp', 'oauth_signature_method', 'oauth_token', 'oauth_version', 'oauth_signature'].include?(item)
}.sort.map { |item| "#{item}=\"#{params[item]}\"" }.join(', ')
STDERR.puts '--------------------------------'
STDERR.puts "header"
STDERR.puts header

curl_str = "curl -v -X #{method} --url '#{endpoint}#{query != '' ? "?#{query}" : ''}' --header 'authorization: OAuth #{header}'"
STDERR.puts '--------------------------------'
STDERR.puts "$ #{curl_str}"
STDERR.puts '================================'
puts `#{curl_str}`
STDERR.puts '================================'