camo the emotes on the campaign show page

app/helpers/application_helper.rb

@@ -214,5 +214,19 @@ module ApplicationHelper
       :contributions_link_url => user_contributions_path(user),
       :user_points => user.points
   end
+
+  def camo_image_url(image_url)
+    if CAMO_KEY
+      hexdigest = OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha1'), CAMO_KEY, image_url)
+      uri = Addressable::URI.parse("#{CAMO_HOST}/#{hexdigest}")
+      uri.query_values = { 'url' => image_url, 'repo' => '', 'path' => '' }
+      uri.to_s
+    else
+      uri = Addressable::URI.parse(image_url)
+      query_values = uri.query_values || {}
+      uri.query_values = query_values.merge(NO_CAMO_CONFIG: nil)
+      uri.to_s
+    end
+  end
 end
 

app/views/campaigns/show.html.haml

@@ -76,7 +76,7 @@
     However, there are a few important bits of legal whatnot to keep in mind.
     (Mostly, it's the list of things that we expect to do but in no legally
     binding way promise to do. Just in case
-    <img src="http://images.neopets.com/neoboards/smilies/tongue.gif" />)
+    <img src="#{camo_image_url 'http://images.neopets.com/neoboards/smilies/tongue.gif'}" />)
 
     Featuring your outfit is a thank-you gift that we like to give our donors;
     it is *not* a purchased service. We make no guarantee that we'll post your
@@ -98,7 +98,7 @@
     Posting an obscene outfit then requesting a refund once we take it down is
     *not* acting in good faith, and we don't want our refund policy to
     encourage that behavior
-    <img src="http://images.neopets.com/neoboards/smilies/tongue.gif" />
+    <img src="#{camo_image_url 'http://images.neopets.com/neoboards/smilies/tongue.gif'}" />
     We determine "good faith" at our sole discretion—not limited to those
     examples—but we're generally pretty understanding.)
 

config/initializers/camo.rb

@@ -0,0 +1,4 @@
+# For the openneo-camo.herokuapps.com server, which proxies assets through HTTPS.
+# If you have no config, that's okay; we'll just serve the regular URL instead of the Camo URL.
+CAMO_HOST = ENV['CAMO_HOST']
+CAMO_KEY = ENV['CAMO_KEY']