Simple Gravatar Rails Helper

gravatar_helper.rb

# Copyright (c) 2016-2017 Itay Grudev
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

require 'digest/md5'

module GravatarHelper
  GRAVATAR_API_URL = 'http://gravatar.com/avatar/'
  GRAVATAR_SECURE_API_URL = 'https://secure.gravatar.com/avatar/'

  def gravatar_url( email, options = { } )
    options = {
      secure: true,
      size: 160,
      default: 'mm',
      rating: :g,
      force: false
    }.merge( options )

    if options[:secure]
      url = GRAVATAR_SECURE_API_URL
    else
      url = GRAVATAR_API_URL
    end

    url += Digest::MD5.hexdigest( email )

    url += '?'
    url += "s=#{options[:size]}&" if options[:size] != 80
    url += "d=#{options[:default]}&" if options[:default] != nil
    url += "r=#{options[:rating]}&" if options[:rating] != :g
    url += 'f=y&' if options[:force]

    url[0...-1] # Removes the last charecter (an extra ? or &)
  end
end

usage_example.html.erb

<img src="<%= gravatar_url(current_user.email, secure: true, default: :mm) %>">