Make headline images explicit, add asset credits

- related_assets gains a `headline` boolean (DB-enforced: at most one
  per page), replacing "first image by position" as the headline
  rule. A rake task backfills the current first image on every live
  head/draft, so nothing changes visually until an editor changes it.
- The image picker sidebar gets a star toggle reflecting the flag;
  the TinyMCE inline-image picker's badge now reads it too, instead
  of assuming position 0.
- No headline chosen (or none attached) now falls back to the
  gallery-count caption itself becoming the lightbox trigger, instead
  of the gallery being unreachable.
- Assets gain creator, source_url, and license_key (against a new
  config/asset_licenses.yml dictionary). asset_credit renders a
  degrading attribution line, reused as a hidden per-image glightbox
  caption so credit is one click away for every image, not only the
  headline's always-visible one.
- Fixed: asset thumbnails rendered unconditionally regardless of
  whether a real variant exists on disk. Asset#has_variant? checks
  file existence, not content type -- some legacy PDFs have real
  pre-rewrite thumbnails a content-type check would have hidden.
- assets#new/edit rebuilt onto the same node_description/node_content
  layout as assets#show, picking up the three new fields in the
  process.

2 files changed, 28 insertions, 19 deletions

diff --git a/public/javascripts/admin_interface.js b/public/javascripts/admin_interface.js
index e9f96c2..7fb1dc2 100644
--- a/public/javascripts/admin_interface.js
+++ b/public/javascripts/admin_interface.js
@@ -277,10 +277,12 @@ cccms = {
 
       var items = $('#related_asset_list li').map(function() {
         return {
+          id: $(this).data('asset-id'),
           thumb: $(this).find('img').attr('src'),
           large: $(this).data('large-url'),
           original: $(this).data('original-url'),
-          name: $(this).data('name')
+          name: $(this).data('name'),
+          headline: $(this).data('headline') === true
         };
       }).get();
       cccms.inline_images.items = items;
@@ -293,7 +295,7 @@ cccms = {
         items.forEach(function(item, i) {
           var wrapper = $('<div class="inline_image_picker_item"></div>');
           wrapper.append($('<img>').attr('src', item.thumb).attr('data-index', i));
-          if (i === 0) {
+          if (item.headline) {
             wrapper.append($('<span>', { "class": "inline_image_picker_headline_badge" }).text("Headline"));
           }
           grid.append(wrapper);
@@ -317,8 +319,10 @@ cccms = {
         ? 'inline-image inline-image--full'
         : 'inline-image inline-image--half inline-image--' + placement;
 
-      var html = '<a href="' + item.original + '" class="glightbox" data-gallery="page-' + cccms.inline_images.node_id + '">' +
-                  '<img src="' + item.large + '" class="' + classes + '" alt="' + cccms.inline_images.escape_attr(item.name) + '"></a>';
+      var esc = cccms.inline_images.escape_attr;
+      var html = '<a href="' + esc(item.original) + '" class="glightbox" data-gallery="page-' + esc(cccms.inline_images.node_id) + '"' +
+                 ' data-title="' + esc(item.name) + '" data-description="#credit_for_asset_' + esc(item.id) + '">' +
+                 '<img src="' + esc(item.large) + '" class="' + classes + '" alt="' + esc(item.name) + '"></a>';
 
       cccms.inline_images.editor.insertContent(html);
       $('#inline_image_picker').hide();
diff --git a/public/javascripts/related_assets.js b/public/javascripts/related_assets.js
index 3340fa7..cc07d86 100644
--- a/public/javascripts/related_assets.js
+++ b/public/javascripts/related_assets.js
@@ -5,8 +5,6 @@ related_assets = {
     var createUrl = container.data("create-url");
     var list = $("#related_asset_list");
 
-    related_assets.update_headline_badge(list);
-
     initSearchPicker({
       inputSelector: "#related_asset_search_term",
       resultsSelector: "#related_asset_search_results",
@@ -44,7 +42,6 @@ related_assets = {
           url: ui.item.data("url"),
           data: "position=" + newPosition
         });
-        related_assets.update_headline_badge(list);
       }
     });
 
@@ -55,21 +52,29 @@ related_assets = {
         url: item.data("url"),
         success: function() {
           item.remove();
-          related_assets.update_headline_badge(list);
         }
       });
     });
-  },
 
-  update_headline_badge: function(list) {
-    list.find(".related_asset_headline_badge").remove();
-    var first = list.children("li").first();
-    if (first.length) {
-      $("<span>", {
-        "class": "related_asset_headline_badge",
-        "title": "Shown automatically as this page's headline image"
-      }).text("Headline").insertBefore(first.find(".related_asset_remove"));
-    }
+    list.on("click", ".related_asset_set_headline", function() {
+      var button = $(this);
+      var item = button.closest("li");
+      var makeHeadline = button.attr("aria-pressed") !== "true";
+
+      $.ajax({
+        type: "PATCH",
+        url: item.data("url"),
+        data: "headline=" + makeHeadline,
+        success: function() {
+          list.children("li").removeClass("is_headline")
+              .find(".related_asset_set_headline").attr("aria-pressed", "false");
+          if (makeHeadline) {
+            item.addClass("is_headline");
+            button.attr("aria-pressed", "true");
+          }
+        }
+      });
+    });
   },
 
   attach: function(assetId, createUrl, list) {
@@ -81,13 +86,13 @@ related_assets = {
       success: function(related) {
         var item = $($("#related_asset_template").html().trim());
         item.attr("data-url", related.url);
+        item.attr("data-asset-id", related.asset_id);
         item.attr("data-large-url", related.large_url);
         item.attr("data-original-url", related.original_url);
         item.attr("data-name", related.name);
         item.find("img").attr("src", related.thumb_url);
         list.append(item);
         list.sortable("refresh");
-        related_assets.update_headline_badge(list);
         $("#related_asset_search_term").val("");
         $("#related_asset_search_results").slideUp().empty();
       }