Always redirect user to downcase version of tags on UTF-8 encoding

app/assets/javascripts/app/helpers/text_formatter.js

@@ -104,7 +104,8 @@ $(function() {
   textFormatter.hashtagify = function hashtagify(text){
     var utf8WordCharcters =/(\s|^|>)#([\u0080-\uFFFF|\w|-]+|<3)/g
     return text.replace(utf8WordCharcters, function(hashtag, preceeder, tagText) {
-      return preceeder + "<a href='/tags/" + tagText + "' class='tag'>#" + tagText + "</a>"
+      return preceeder + "<a href='/tags/" + tagText.toLowerCase() +
+                         "' class='tag'>#" + tagText + "</a>"
     })
   };
 

app/assets/javascripts/app/router.js

@@ -77,7 +77,7 @@ app.Router = Backbone.Router.extend({
 
     if(name) {
       var followedTagsAction = new app.views.TagFollowingAction(
-            {tagText: decodeURIComponent(name)}
+            {tagText: decodeURIComponent(name).toLowerCase()}
           );
       $("#author_info").prepend(followedTagsAction.render().el)
     }

app/controllers/tags_controller.rb

@@ -30,6 +30,8 @@ class TagsController < ApplicationController
   end
 
   def show
+    redirect_to(:action => :show, :name => downcased_tag_name) && return if tag_has_capitals?
+
     if user_signed_in?
       gon.tagFollowings = tags
     end
@@ -45,6 +47,15 @@ class TagsController < ApplicationController
     TagFollowing.user_is_following?(current_user, params[:name])
   end
 
+  def tag_has_capitals?
+    mb_tag = params[:name].mb_chars
+    mb_tag.downcase != mb_tag
+  end
+
+  def downcased_tag_name
+    params[:name].mb_chars.downcase.to_s
+  end
+
   def prep_tags_for_javascript
     @tags.map! do |tag|
       { :name  => ("#" + tag.name) }

spec/controllers/tags_controller_spec.rb

@@ -36,6 +36,17 @@ describe TagsController do
   end
 
   describe '#show' do
+    context 'tag with capital letters' do
+      before do
+        sign_in :user, alice
+      end
+
+      it 'redirect to the downcase tag uri' do
+        get :show, :name => 'DiasporaRocks!'
+        response.should redirect_to(:action => :show, :name => 'diasporarocks!')
+      end
+    end
+
     context 'signed in' do
       before do
         sign_in :user, alice

spec/javascripts/app/helpers/text_formatter_spec.js

@@ -214,6 +214,12 @@ describe("app.helpers.textFormatter", function(){
         expect(wrapper.find("h1").length).toBe(0)
         expect(wrapper.find("a[href='/tags/parties']").text()).toContain("#parties")
       })
+
+      it("and the resultant link has the tags name downcased", function(){
+        var formattedText = this.formatter.hashtagify("#PARTIES, I love")
+
+        expect(formattedText).toContain("/tags/parties")
+      })
     })
   })
 

spec/javascripts/app/router_spec.js

@@ -15,5 +15,21 @@ describe('app.Router', function () {
       expect(followed_tags).toHaveBeenCalled();
       expect(tag_following_action).toHaveBeenCalledWith({tagText: 'օբյեկտիվ'});
     });
+
+    it('navigates to the downcase version of the corresponding tag', function () {
+      var followed_tags = spyOn(app.router, 'followed_tags').andCallThrough();
+      var tag_following_action = spyOn(app.views, 'TagFollowingAction').andCallFake(function(data) {
+        return {render: function() { return {el: ""}}};
+      });
+      spyOn(window.history, 'pushState').andCallFake(function (data, title, url) {
+        var route = app.router._routeToRegExp("tags/:name");
+        var args = app.router._extractParameters(route, url.replace(/^\//, ""));
+        app.router.followed_tags(args[0]);
+      });
+      window.preloads = {tagFollowings: []};
+      app.router.navigate('/tags/'+encodeURIComponent('SomethingWithCapitalLetters'));
+      expect(followed_tags).toHaveBeenCalled();
+      expect(tag_following_action).toHaveBeenCalledWith({tagText: 'somethingwithcapitalletters'});
+    });
   });
 });