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