FatSecret API in Ruby on Rails example

fatsecret.rb

require "openssl"
require "base64"
require "digest/md5"
require "net/http"

class String
  def esc
      CGI.escape(self).gsub("%7E", "~").gsub("+", "%20")
  end
end

class Food < ActiveRecord::Base
  # attr_accessible :title, :body

KEY = "YOUR_KEY_HERE"
SECRET = "YOUR_SECRET_HERE"
SHA1 = "HMAC-SHA1"
SITE = "http://platform.fatsecret.com/rest/server.api"
class String
  def esc
      CGI.escape(self).gsub("%7E", "~").gsub("+", "%20")
  end
end
def self.search(expression)
  params = {
    :oauth_consumer_key => KEY,
    :oauth_nonce => Digest::MD5.hexdigest(rand(11).to_s),
    :oauth_signature_method => SHA1,
    :oauth_timestamp => Time.now.to_i,
    :oauth_version => "1.0",
    :method => 'foods.search',
    :search_expression => expression
  }
  sorted_params = params.sort {|a, b| a.first.to_s <=> b.first.to_s}
  base = base_string("GET", sorted_params)
  http_params = http_params("GET", params)
  sig = sign(base).esc
  uri = uri_for(http_params, sig)
  results = Net::HTTP.get(uri)
end

def self.base_string(http_method, param_pairs)
  param_str = param_pairs.collect{|pair| "#{pair.first}=#{pair.last}"}.join('&')
  list = [http_method.esc, SITE.esc, param_str.esc]
  list.join("&")
end

def self.http_params(method, args)
  pairs = args.sort {|a, b| a.first.to_s <=> b.first.to_s}
  list = []
  pairs.inject(list) {|arr, pair| arr << "#{pair.first.to_s}=#{pair.last}"}
  list.join("&")
end

def self.sign(base, token='')
  secret = "#{SECRET.esc}&#{token.esc}"
  base64 = Base64.encode64(OpenSSL::HMAC.digest('sha1',secret, base)).gsub(/\n/,'')
end

def self.uri_for(params, signature)
  parts = params.split('&')
  parts << "oauth_signature=#{signature}"
  URI.parse("#{SITE}?#{parts.join('&')}")
end

end

Thanks for this!!

Yes, this is extremely helpful. Thank you!

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