OAuth Signature Checker

require 'simple_oauth'
SimpleOAuth::Header::ATTRIBUTE_KEYS << :body_hash unless SimpleOAuth::Header::ATTRIBUTE_KEYS.include? :body_hash

def self.validate(header, url, secret)
  o = SimpleOAuth::Header.new(:post, url, {}, SimpleOAuth::Header.parse(header).merge({consumer_secret: secret}))
  puts o.send(:signature)
  puts o.send(:signature_base)
  #puts o.send(:secret)
  puts o.valid?()
  o
end

this is using the simple_oauth 0.2.0 version

sample call:
validate(
'OAuth oauth_body_hash="Bxm2wNURamGzegzEERiM44CxC5I%3D", oauth_signature_method="HMAC-SHA1", oauth_nonce="C492D22B-0A06-0894-6824-2E51BB2D2F97", oauth_consumer_key="mKes4fd", oauth_timestamp="17337600", oauth_version="1.0", oauth_signature="F8EuLjA3kfH+WcwQ4bisxmUsfpU="',
'https://canvas.instructure.com/test/42',
'shhh'
)