FEATURE: use original filename when clicking the download link in the lightbox

app/assets/javascripts/discourse/lib/lightbox.js

@@ -36,10 +36,11 @@ Discourse.Lightbox = {
 
           image: {
             titleSrc: function(item) {
+              var href = item.el.data("download-href") || item.src;
               return [
                 item.el.attr("title"),
                 $("span.informations", item.el).text().replace('x', '×'),
-                '<a class="image-source-link" href="' + item.src + '" target="_blank">' + I18n.t("lightbox.download") + '</a>'
+                '<a class="image-source-link" href="' + href + '">' + I18n.t("lightbox.download") + '</a>'
               ].join(' &middot; ');
             }
           }

lib/cooked_post_processor.rb

@@ -159,6 +159,11 @@ class CookedPostProcessor
     # then, the link to our larger image
     a = Nokogiri::XML::Node.new("a", @doc)
     img.add_next_sibling(a)
+
+    if upload && Discourse.store.internal?
+      a["data-download-href"] = Discourse.store.download_url(upload)
+    end
+
     a["href"] = img["src"]
     a["class"] = "lightbox"
     a.add_child(img)
@@ -217,9 +222,11 @@ class CookedPostProcessor
   end
 
   def optimize_urls
-    @doc.css("a[href]").each do |a|
-      href = a["href"].to_s
-      a["href"] = schemaless absolute(href) if is_local(href)
+    %w{href data-download-href}.each do |selector|
+      @doc.css("a[#{selector}]").each do |a|
+        href = a["#{selector}"].to_s
+        a["#{selector}"] = schemaless absolute(href) if is_local(href)
+      end
     end
 
     @doc.css("img[src]").each do |img|
@@ -243,17 +250,17 @@ class CookedPostProcessor
   end
 
   def disable_if_low_on_disk_space
-    if available_disk_space < SiteSetting.download_remote_images_threshold
-      SiteSetting.download_remote_images_to_local = false
-      # log the site setting change
-      reason = I18n.t("disable_remote_images_download_reason")
-      staff_action_logger = StaffActionLogger.new(Discourse.system_user)
-      staff_action_logger.log_site_setting_change("download_remote_images_to_local", true, false, { details: reason })
-      # also send a private message to the site contact user
-      SystemMessage.create_from_system_user(Discourse.site_contact_user, :download_remote_images_disabled)
-      return true
-    end
-    false
+    return false if available_disk_space >= SiteSetting.download_remote_images_threshold
+
+    SiteSetting.download_remote_images_to_local = false
+    # log the site setting change
+    reason = I18n.t("disable_remote_images_download_reason")
+    staff_action_logger = StaffActionLogger.new(Discourse.system_user)
+    staff_action_logger.log_site_setting_change("download_remote_images_to_local", true, false, { details: reason })
+    # also send a private message to the site contact user
+    SystemMessage.create_from_system_user(Discourse.site_contact_user, :download_remote_images_disabled)
+
+    true
   end
 
   def available_disk_space

lib/file_store/base_store.rb

@@ -23,6 +23,9 @@ module FileStore
     def relative_base_url
     end
 
+    def download_url(upload)
+    end
+
     def external?
     end
 

lib/file_store/local_store.rb

@@ -34,6 +34,11 @@ module FileStore
       "/uploads/#{RailsMultisite::ConnectionManagement.current_db}"
     end
 
+    def download_url(upload)
+      return unless upload
+      "#{relative_base_url}/#{upload.sha1}"
+    end
+
     def external?
       !internal?
     end

plugins/emoji/public/public

@@ -0,0 +1 @@
+/home/regis/Poetry/discourse/plugins/emoji/public

spec/components/cooked_post_processor_spec.rb

@@ -90,7 +90,7 @@ describe CookedPostProcessor do
 
       it "generates overlay information" do
         cpp.post_process_images
-        cpp.html.should match_html '<div class="lightbox-wrapper"><a href="/uploads/default/1/1234567890123456.jpg" class="lightbox" title="logo.png"><img src="/uploads/default/_optimized/da3/9a3/ee5e6b4b0d_690x1380.png" width="690" height="1380"><div class="meta">
+        cpp.html.should match_html '<div class="lightbox-wrapper"><a data-download-href="/uploads/default/e9d71f5ee7c92d6dc9e92ffdad17b8bd49418f98" href="/uploads/default/1/1234567890123456.jpg" class="lightbox" title="logo.png"><img src="/uploads/default/_optimized/da3/9a3/ee5e6b4b0d_690x1380.png" width="690" height="1380"><div class="meta">
 <span class="filename">logo.png</span><span class="informations">1000x2000 1.21 KB</span><span class="expand"></span>
 </div></a></div>'
         cpp.should be_dirty