5 files changed, 68 insertions, 0 deletions
diff --git a/app/serializers/blob_entity.rb b/app/serializers/blob_entity.rb
new file mode 100644
index 00000000000..56f173e5a27
--- /dev/null
+++ b/app/serializers/blob_entity.rb
@@ -0,0 +1,17 @@
+class BlobEntity < Grape::Entity
+  include RequestAwareEntity
+
+  expose :id, :path, :name, :mode
+
+  expose :last_commit do |blob|
+    request.project.repository.last_commit_for_path(blob.commit_id, blob.path)
+  end
+
+  expose :icon do |blob|
+    IconsHelper.file_type_icon_class('file', blob.mode, blob.name)
+  end
+
+  expose :url do |blob|
+    project_blob_path(request.project, File.join(request.ref, blob.path))
+  end
+end
diff --git a/app/serializers/submodule_entity.rb b/app/serializers/submodule_entity.rb
new file mode 100644
index 00000000000..9a7eb5e7880
--- /dev/null
+++ b/app/serializers/submodule_entity.rb
@@ -0,0 +1,23 @@
+class SubmoduleEntity < Grape::Entity
+  include RequestAwareEntity
+
+  expose :id, :path, :name, :mode
+
+  expose :icon do |blob|
+    'archive'
+  end
+
+  expose :project_url do |blob|
+    submodule_links(blob, request).first
+  end
+
+  expose :tree_url do |blob|
+    submodule_links(blob, request).last
+  end
+
+  private
+
+  def submodule_links(blob, request)
+    @submodule_links ||= SubmoduleHelper.submodule_links(blob, request.ref, request.repository)
+  end
+end
diff --git a/app/serializers/tree_entity.rb b/app/serializers/tree_entity.rb
new file mode 100644
index 00000000000..555e5cf83bd
--- /dev/null
+++ b/app/serializers/tree_entity.rb
@@ -0,0 +1,17 @@
+class TreeEntity < Grape::Entity
+  include RequestAwareEntity
+
+  expose :id, :path, :name, :mode
+
+  expose :last_commit do |tree|
+    request.project.repository.last_commit_for_path(tree.commit_id, tree.path)
+  end
+
+  expose :icon do |tree|
+    IconsHelper.file_type_icon_class('folder', tree.mode, tree.name)
+  end
+
+  expose :url do |tree|
+    project_tree_path(request.project, File.join(request.ref, tree.path))
+  end
+end
diff --git a/app/serializers/tree_root_entity.rb b/app/serializers/tree_root_entity.rb
new file mode 100644
index 00000000000..23b65aa4a4c
--- /dev/null
+++ b/app/serializers/tree_root_entity.rb
@@ -0,0 +1,8 @@
+# TODO: Inherit from TreeEntity, when `Tree` implements `id` and `name` like `Gitlab::Git::Tree`.
+class TreeRootEntity < Grape::Entity
+  expose :path
+  
+  expose :trees, using: TreeEntity
+  expose :blobs, using: BlobEntity
+  expose :submodules, using: SubmoduleEntity
+end
diff --git a/app/serializers/tree_serializer.rb b/app/serializers/tree_serializer.rb
new file mode 100644
index 00000000000..713ade23bc9
--- /dev/null
+++ b/app/serializers/tree_serializer.rb
@@ -0,0 +1,3 @@
+class TreeSerializer < BaseSerializer
+  entity TreeRootEntity
+end