Hide HTTPS clone button for non-public projects for CAS users

Additionally, the prompt to set a password is no longer shown for CAS
users.

app/helpers/button_helper.rb

@@ -39,7 +39,7 @@ def http_clone_button(project, placement = 'right', append_link: true)
         html: true,
         placement: placement,
         container: 'body',
-        title: "Set a password on your account<br>to pull or push via #{protocol}"
+        title: (current_user && current_user.cas_user?) ? "You cannot push via #{gitlab_config.protocol.upcase}" : "Set a password on your account<br>to pull or push via #{protocol}"
       }
   end
 

app/views/projects/empty.html.haml

@@ -3,7 +3,7 @@
 = content_for :flash_message do
   - if current_user && can?(current_user, :download_code, @project)
     = render 'shared/no_ssh'
-    = render 'shared/no_password'
+    = render 'shared/no_password' unless current_user.cas_user?
 
 = render "home_panel"
 

app/views/projects/show.html.haml

@@ -7,7 +7,7 @@
 = content_for :flash_message do
   - if current_user && can?(current_user, :download_code, @project)
     = render 'shared/no_ssh'
-    = render 'shared/no_password'
+    = render 'shared/no_password' unless current_user.cas_user?
 
 = render 'projects/last_push'
 = render "home_panel"

app/views/shared/_clone_panel.html.haml

@@ -2,7 +2,7 @@
 
 .git-clone-holder.input-group
   .input-group-btn
-    -if allowed_protocols_present?
+    -if allowed_protocols_present? && (project.visibility_level == Gitlab::VisibilityLevel::PUBLIC || (current_user && !current_user.cas_user?))
       .clone-dropdown-btn.btn.btn-static
         %span
           = enabled_project_button(project, enabled_protocol)
@@ -14,8 +14,9 @@
       %ul.dropdown-menu.dropdown-menu-right.clone-options-dropdown
         %li
           = ssh_clone_button(project)
-        %li
-          = http_clone_button(project)
+        - if project.visibility_level == Gitlab::VisibilityLevel::PUBLIC || (current_user && !current_user.cas_user?)
+          %li
+            = http_clone_button(project)
 
   = text_field_tag :project_clone, default_url_to_repo(project), class: "js-select-on-focus form-control", readonly: true
   .input-group-btn