Save image with Mechanize and Nokogiri? - ruby

Question

I'm using Mechanize and Nokogiri to gather some data. I need to save a picture that's randomly generated at each request.
In my attempt I'm forced to download all pictures, but the only one I really want is the image located within div#specific.
In addition, is it possible to generate Base64 data from it, without saving it, or reloading its source?
require 'rubygems'
require 'mechanize'
require 'nokogiri'
a = Mechanize.new { |agent|
agent.keep_alive = true
agent.max_history = 0
}
urls = Array.new()
urls.push('http://www.domain.com');
urls.each {|url|
page = a.get(url)
doc = Nokogiri::HTML(page.body)
if doc.at_css('#specific')
page.images.each do |img|
img.fetch.save('picture.png')
end
end
}

Answer 1

To fetch the images from the specific location:
agent = Mechanize.new
page = agent.get('http://www.domain.com')
images = page.search("#specific img")
To save the image:
agent.get(images.first.attributes["src"]).save "path/to/folder/image_name.jpg"
To get image encoded without saving:
encoded_image = Base64.encode64 agent.get(images.first.attributes["src"]).body_io.string
I ran this just to make sure that the image that was encoded can be decoded back:
File.open("images/image_name.jpg", "wb") {|f| f.write(Base64.decode64(encoded_image))}