Add new JSON endpoint for reshares

app/controllers/reshares_controller.rb

@@ -17,4 +17,16 @@ class ResharesController < ApplicationController
       render :nothing => true, :status => 422
     end
   end
+
+  def index
+    @reshares = target.reshares.includes(author: :profile)
+    render json: @reshares.as_api_response(:backbone)
+  end
+
+  private
+
+  def target
+    @target ||= current_user.find_visible_shareable_by_id(Post, params[:post_id]) ||
+      raise(ActiveRecord::RecordNotFound.new)
+  end
 end

app/models/reshare.rb

@@ -21,6 +21,14 @@ class Reshare < Post
     self.root.update_reshares_counter if self.root.present?
   end
 
+  acts_as_api
+  api_accessible :backbone do |t|
+    t.add :id
+    t.add :guid
+    t.add :author
+    t.add :created_at
+  end
+
   def root_diaspora_id
     root.try(:author).try(:diaspora_handle)
   end

config/routes.rb

@@ -38,6 +38,7 @@ Diaspora::Application.routes.draw do
     resources :poll_participations, only: :create
     resources :likes, only: %i(create destroy index)
     resources :comments, only: %i(new create destroy index)
+    resources :reshares, only: :index
   end
 
   get 'p/:id' => 'posts#show', :as => 'short_post'

spec/controllers/reshares_controller_spec.rb

@@ -64,4 +64,44 @@ describe ResharesController, :type => :controller do
       end
     end
   end
+
+  describe "#index" do
+    context "with a private post" do
+      before do
+        @alices_aspect = alice.aspects.where(name: "generic").first
+        @post = alice.post(:status_message, text: "hey", to: @alices_aspect.id)
+      end
+
+      it "returns a 404 for a post not visible to the user" do
+        sign_in(eve, scope: :user)
+        expect {
+          get :index, post_id: @post.id, format: :json
+        }.to raise_error(ActiveRecord::RecordNotFound)
+      end
+
+      it "returns an empty array for a post visible to the user" do
+        sign_in(bob, scope: :user)
+        get :index, post_id: @post.id, format: :json
+        expect(JSON.parse(response.body)).to eq([])
+      end
+    end
+
+    context "with a public post" do
+      before do
+        sign_in(alice, scope: :user)
+        @post = alice.post(:status_message, text: "hey", public: true)
+      end
+
+      it "returns an array of reshares for a post" do
+        bob.reshare!(@post)
+        get :index, post_id: @post.id, format: :json
+        expect(JSON.parse(response.body).map {|h| h["id"] }).to eq(@post.reshares.map(&:id))
+      end
+
+      it "returns an empty array for a post with no likes" do
+        get :index, post_id: @post.id, format: :json
+        expect(JSON.parse(response.body)).to eq([])
+      end
+    end
+  end
 end