use context_host, not default_host, in conversation notifications

Change-Id: I3c1509f41d4a45731a2ed85972c00f63b358f1a2
Reviewed-on: https://gerrit.instructure.com/5203
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>

app/messages/added_to_conversation.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  http://<%= HostUrl.default_host %>/conversations/#/conversations/<%= asset.conversation_id %>
+  http://<%= HostUrl.context_host(user) %>/conversations/#/conversations/<%= asset.conversation_id %>
 <% end %>
 <% define_content :user_name do %>
   <%= asset.author.short_name rescue t(:unknown_user, "Unknown User") %>

app/messages/added_to_conversation.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  http://<%= HostUrl.default_host %>/conversations/#/conversations/<%= asset.conversation_id %>
+  http://<%= HostUrl.context_host(user) %>/conversations/#/conversations/<%= asset.conversation_id %>
 <% end %>
 <%= t :body, "%{user_name} just added you to a conversation in Canvas.", :user_name => (asset.author.short_name rescue t(:unknown_user, "Unknown User")) %><br/>
 <b><a href="<%= content :link %>"><%= t :link_text, "View Conversation" %></a></b>

app/messages/added_to_conversation.sms.erb

@@ -1,3 +1,3 @@
 <%= t :body, "%{user_name} just added you to a conversation in Canvas.", :user_name => (asset.author.short_name rescue t(:unknown_user, 'Unknown User')) %>
 
-<%= t :more_info, "More info at %{url}", :url => HostUrl.default_host %>
+<%= t :more_info, "More info at %{url}", :url => HostUrl.context_host(user) %>

app/messages/added_to_conversation.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  http://<%= HostUrl.default_host %>/conversations/#/conversations/<%= asset.conversation_id %>
+  http://<%= HostUrl.context_host(user) %>/conversations/#/conversations/<%= asset.conversation_id %>
 <% end %>
 <% define_content :user_name do %>
   <%= asset.author.short_name rescue t(:unknown_user, "Unknown User") %>

app/messages/conversation_message.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  http://<%= HostUrl.default_host %>/conversations/#/conversations/<%= asset.conversation_id %>
+  http://<%= HostUrl.context_host(user) %>/conversations/#/conversations/<%= asset.conversation_id %>
 <% end %>
 <% define_content :user_name do %>
   <%= asset.author.short_name rescue t(:unknown_user, "Unknown User") %>
@@ -24,7 +24,6 @@
 <%= t :attached_files, "Attached Files:" %>
 <% asset.attachments.each do |attachment| %>
 <%= attachment.display_name %> - <%= attachment.readable_size %> 
-http://<%= HostUrl.default_host %>/files/<%= attachment.id %>
-
+http://<%= HostUrl.context_host(user) %>/files/<%= attachment.id %>/download?verifier=<%= attachment.uuid %>
 <% end %>
 <% end %>

app/messages/conversation_message.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  http://<%= HostUrl.default_host %>/conversations/#/conversations/<%= asset.conversation_id %>
+  http://<%= HostUrl.context_host(user) %>/conversations/#/conversations/<%= asset.conversation_id %>
 <% end %>
 <%= t :body, "%{user_name} just sent you a message in Canvas.", :user_name => (asset.author.short_name rescue t(:unknown_user, "Unknown User")) %><br/>
 <b><a href="<%= content :link %>"><%= t :link_text, "View Message" %></a></b>

app/messages/conversation_message.sms.erb

@@ -2,4 +2,4 @@
 
 <%= strip_and_truncate(asset.body, :max_length => 50) %>
 
-<%= t :more_info, "More info at %{url}", :url => HostUrl.default_host %>
+<%= t :more_info, "More info at %{url}", :url => HostUrl.context_host(user) %>

app/messages/conversation_message.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  http://<%= HostUrl.default_host %>/conversations/#/conversations/<%= asset.conversation_id %>
+  http://<%= HostUrl.context_host(user) %>/conversations/#/conversations/<%= asset.conversation_id %>
 <% end %>
 <% define_content :user_name do %>
   <%= asset.author.short_name rescue t(:unknown_user, "Unknown User") %>