Chris@909: require 'digest/md5'
Chris@909: require 'cgi'
Chris@909: 
Chris@909: module GravatarHelper
Chris@909: 
Chris@909:   # These are the options that control the default behavior of the public
Chris@909:   # methods. They can be overridden during the actual call to the helper,
Chris@909:   # or you can set them in your environment.rb as such:
Chris@909:   #
Chris@909:   #   # Allow racier gravatars
Chris@909:   #   GravatarHelper::DEFAULT_OPTIONS[:rating] = 'R'
Chris@909:   #
Chris@909:   DEFAULT_OPTIONS = {
Chris@909:     # The URL of a default image to display if the given email address does
Chris@909:     # not have a gravatar.
Chris@909:     :default => nil,
Chris@909:     
Chris@909:     # The default size in pixels for the gravatar image (they're square).
Chris@909:     :size => 50,
Chris@909:     
Chris@909:     # The maximum allowed MPAA rating for gravatars. This allows you to 
Chris@909:     # exclude gravatars that may be out of character for your site.
Chris@909:     :rating => 'PG',
Chris@909:     
Chris@909:     # The alt text to use in the img tag for the gravatar.  Since it's a
Chris@909:     # decorational picture, the alt text should be empty according to the
Chris@909:     # XHTML specs.
Chris@909:     :alt => '',
Chris@909: 
Chris@909:     # The title text to use for the img tag for the gravatar.
Chris@909:     :title => '',
Chris@909:     
Chris@909:     # The class to assign to the img tag for the gravatar.
Chris@909:     :class => 'gravatar',
Chris@909:     
Chris@909:     # Whether or not to display the gravatars using HTTPS instead of HTTP
Chris@909:     :ssl => false,
Chris@909:   }
Chris@909:   
Chris@909:   # The methods that will be made available to your views.
Chris@909:   module PublicMethods
Chris@909:   
Chris@909:     # Return the HTML img tag for the given user's gravatar. Presumes that 
Chris@909:     # the given user object will respond_to "email", and return the user's
Chris@909:     # email address.
Chris@909:     def gravatar_for(user, options={})
Chris@909:       gravatar(user.email, options)
Chris@909:     end
Chris@909: 
Chris@909:     # Return the HTML img tag for the given email address's gravatar.
Chris@909:     def gravatar(email, options={})
Chris@909:       src = h(gravatar_url(email, options))
Chris@909:       options = DEFAULT_OPTIONS.merge(options)
Chris@909:       [:class, :alt, :size, :title].each { |opt| options[opt] = h(options[opt]) }
Chris@909:       "<img class=\"#{options[:class]}\" alt=\"#{options[:alt]}\" title=\"#{options[:title]}\" width=\"#{options[:size]}\" height=\"#{options[:size]}\" src=\"#{src}\" />"
Chris@909:     end
Chris@909:     
Chris@909:     # Returns the base Gravatar URL for the given email hash. If ssl evaluates to true,
Chris@909:     # a secure URL will be used instead. This is required when the gravatar is to be 
Chris@909:     # displayed on a HTTPS site.
Chris@909:     def gravatar_api_url(hash, ssl=false)
Chris@909:       if ssl
Chris@909:         "https://secure.gravatar.com/avatar/#{hash}"
Chris@909:       else
Chris@909:         "http://www.gravatar.com/avatar/#{hash}"
Chris@909:       end
Chris@909:     end
Chris@909: 
Chris@909:     # Return the gravatar URL for the given email address.
Chris@909:     def gravatar_url(email, options={})
Chris@909:       email_hash = Digest::MD5.hexdigest(email)
Chris@909:       options = DEFAULT_OPTIONS.merge(options)
Chris@909:       options[:default] = CGI::escape(options[:default]) unless options[:default].nil?
Chris@909:       gravatar_api_url(email_hash, options.delete(:ssl)).tap do |url|
Chris@909:         opts = []
Chris@909:         [:rating, :size, :default].each do |opt|
Chris@909:           unless options[opt].nil?
Chris@909:             value = h(options[opt])
Chris@909:             opts << [opt, value].join('=')
Chris@909:           end
Chris@909:         end
Chris@909:         url << "?#{opts.join('&')}" unless opts.empty?
Chris@909:       end
Chris@909:     end
Chris@909: 
Chris@909:   end
Chris@909:   
Chris@909: end