Backport project template API to CE

5 files changed, 74 insertions, 7 deletions

diff --git a/lib/api/api.rb b/lib/api/api.rb
index 06c8b48b8cc..c49c52213bf 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -132,6 +132,7 @@ module API
     mount ::API::Projects
     mount ::API::ProjectSnapshots
     mount ::API::ProjectSnippets
+    mount ::API::ProjectTemplates
     mount ::API::ProtectedBranches
     mount ::API::ProtectedTags
     mount ::API::Repositories
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index a78a93cbfd9..120545792f2 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -1221,6 +1221,7 @@ module API
     end
 
     class TemplatesList < Grape::Entity
+      expose :key
       expose :name
     end
 
diff --git a/lib/api/project_templates.rb b/lib/api/project_templates.rb
new file mode 100644
index 00000000000..d05ddad7466
--- /dev/null
+++ b/lib/api/project_templates.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+module API
+  class ProjectTemplates < Grape::API
+    include PaginationParams
+
+    TEMPLATE_TYPES = %w[dockerfiles gitignores gitlab_ci_ymls licenses].freeze
+
+    before { authenticate_non_get! }
+
+    params do
+      requires :id, type: String, desc: 'The ID of a project'
+      requires :type, type: String, values: TEMPLATE_TYPES, desc: 'The type (dockerfiles|gitignores|gitlab_ci_ymls|licenses) of the template'
+    end
+    resource :projects do
+      desc 'Get a list of templates available to this project' do
+        detail 'This endpoint was introduced in GitLab 11.4'
+      end
+      params do
+        use :pagination
+      end
+      get ':id/templates/:type' do
+        templates = TemplateFinder
+          .build(params[:type], user_project)
+          .execute
+
+        present paginate(::Kaminari.paginate_array(templates)), with: Entities::TemplatesList
+      end
+
+      desc 'Download a template available to this project' do
+        detail 'This endpoint was introduced in GitLab 11.4'
+      end
+      params do
+        requires :name, type: String, desc: 'The name of the template'
+
+        optional :project, type: String, desc: 'The project name to use when expanding placeholders in the template. Only affects licenses'
+        optional :fullname, type: String, desc: 'The full name of the copyright holder to use when expanding placeholders in the template. Only affects licenses'
+      end
+      get ':id/templates/:type/:name', requirements: { name: /[\w\.-]+/ } do
+        template = TemplateFinder
+          .build(params[:type], user_project, name: params[:name])
+          .execute
+
+        not_found!('Template') unless template.present?
+
+        template.resolve!(
+          project_name: params[:project].presence,
+          fullname: params[:fullname].presence || current_user&.name
+        )
+
+        if template.is_a?(::LicenseTemplate)
+          present template, with: Entities::License
+        else
+          present template, with: Entities::Template
+        end
+      end
+    end
+  end
+end
diff --git a/lib/api/templates.rb b/lib/api/templates.rb
index 8ff3b2ac33c..8dab19d50c2 100644
--- a/lib/api/templates.rb
+++ b/lib/api/templates.rb
@@ -35,7 +35,7 @@ module API
       popular = declared(params)[:popular]
       popular = to_boolean(popular) if popular.present?
 
-      templates = TemplateFinder.build(:licenses, popular: popular).execute
+      templates = TemplateFinder.build(:licenses, nil, popular: popular).execute
 
       present paginate(::Kaminari.paginate_array(templates)), with: ::API::Entities::License
     end
@@ -48,8 +48,7 @@ module API
       requires :name, type: String, desc: 'The name of the template'
     end
     get "templates/licenses/:name", requirements: { name: /[\w\.-]+/ } do
-      templates = TemplateFinder.build(:licenses).execute
-      template = templates.find { |template| template.key == params[:name] }
+      template = TemplateFinder.build(:licenses, nil, name: params[:name]).execute
 
       not_found!('License') unless template.present?
 
@@ -72,7 +71,7 @@ module API
         use :pagination
       end
       get "templates/#{template_type}" do
-        templates = ::Kaminari.paginate_array(TemplateFinder.new(template_type).execute)
+        templates = ::Kaminari.paginate_array(TemplateFinder.build(template_type, nil).execute)
         present paginate(templates), with: Entities::TemplatesList
       end
 
@@ -84,7 +83,7 @@ module API
         requires :name, type: String, desc: 'The name of the template'
       end
       get "templates/#{template_type}/:name" do
-        finder = TemplateFinder.build(template_type, name: declared(params)[:name])
+        finder = TemplateFinder.build(template_type, nil, name: declared(params)[:name])
         new_template = finder.execute
 
         render_response(template_type, new_template)
diff --git a/lib/gitlab/template/base_template.rb b/lib/gitlab/template/base_template.rb
index 3770f3f250b..4456217017f 100644
--- a/lib/gitlab/template/base_template.rb
+++ b/lib/gitlab/template/base_template.rb
@@ -12,14 +12,21 @@ module Gitlab
       def name
         File.basename(@path, self.class.extension)
       end
-      alias_method :id, :name
+      alias_method :key, :name
 
       def content
         @finder.read(@path)
       end
 
+      # Present for compatibility with license templates, which can replace text
+      # like `[fullname]` with a user-specified string. This is a no-op for
+      # other templates
+      def resolve!(_placeholders = {})
+        self
+      end
+
       def to_json
-        { name: name, content: content }
+        { key: key, name: name, content: content }
       end
 
       def <=>(other)