Likes API endpoint complete

app/controllers/api/v1/base_controller.rb

@@ -5,6 +5,8 @@ module Api
     class BaseController < ApplicationController
       include Api::OpenidConnect::ProtectedResourceEndpoint
 
+      protect_from_forgery unless: -> { request.format.json? }
+
       protected
 
       rescue_from Exception do |e|

app/controllers/api/v1/likes_controller.rb

@@ -3,31 +3,55 @@
 module Api
   module V1
     class LikesController < Api::V1::BaseController
+      before_action only: %i[show] do
+        require_access_token %w[read]
+      end
+
       before_action only: %i[create destroy] do
         require_access_token %w[write]
       end
 
       rescue_from ActiveRecord::RecordNotFound do
-        render json: I18n.t("likes.not_found"), status: :not_found
+        render json: I18n.t("api.endpoint_errors.posts.post_not_found"), status: :not_found
       end
 
       rescue_from ActiveRecord::RecordInvalid do
-        render json: I18n.t("likes.create.fail"), status: :not_found
+        render json: I18n.t("api.endpoint_errors.likes.user_not_allowed_to_like"), status: :not_found
+      end
+
+      def show
+        likes = like_service.find_for_post(params[:post_id])
+        render json: likes.map {|x| like_json(x) }
       end
 
       def create
         like_service.create(params[:post_id])
-        head :no_content, status: 204
+      rescue ActiveRecord::RecordInvalid => e
+        return render json: I18n.t("api.endpoint_errors.likes.like_exists"), status: :unprocessable_entity if
+          e.message == "Validation failed: Target has already been taken"
+        raise
+      else
+        head :no_content
       end
 
       def destroy
-        like_service.unlike_post(params[:post_id])
-        head :no_content, status: 204
+        success = like_service.unlike_post(params[:post_id])
+        if success
+          head :no_content
+        else
+          render json: I18n.t("api.endpoint_errors.likes.no_like"), status: :not_found
+        end
       end
 
       def like_service
         @like_service ||= LikeService.new(current_user)
       end
+
+      private
+
+      def like_json(like)
+        LikesPresenter.new(like).as_api_json
+      end
     end
   end
 end

app/presenters/likes_presenter.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class LikesPresenter < BasePresenter
+  def as_api_json
+    {
+      guid:   @presentable.guid,
+      author: PersonPresenter.new(@presentable.author).as_api_json
+    }
+  end
+end

config/locales/diaspora/en.yml

@@ -950,6 +950,13 @@ en:
         contact_developer: "You should contact the developer of the application and include the following detailed error message:"
         login_required: "You must first login before you can authorize this application"
         could_not_authorize: "The application could not be authorized"
+    endpoint_errors:
+      likes:
+        user_not_allowed_to_like: "User is not allowed to like"
+        like_exists: "Like already exists"
+        no_like: "Like doesn’t exist"
+      posts:
+        post_not_found: "Post with provided guid could not be found"
 
   error:
     not_found: "No record found for given id."
@@ -1361,3 +1368,5 @@ en:
     disabled: "Not available"
     open: "Open"
     closed: "Closed"
+
+    

config/routes.rb

@@ -226,7 +226,7 @@ Rails.application.routes.draw do
       resources :comments, only: %i[create index destroy] do
         post "report" => "comments#report"
       end
-      resource :likes, only: %i[create destroy]
+      resource :likes, only: %i[show create destroy]
     end
     resources :conversations, only: %i[show index create destroy] do
       resources :messages, only: %i[index create]

spec/integration/api/likes_controller_spec.rb

@@ -15,6 +15,47 @@ describe Api::V1::LikesController do
     )
   end
 
+  describe "#show" do
+    context "with right post id" do
+      it "succeeds in getting empty likes" do
+        get(
+          api_v1_post_likes_path(post_id: @status.guid),
+          params: {access_token: access_token}
+        )
+        expect(response.status).to eq(200)
+        likes = response_body(response)
+        expect(likes.length).to eq(0)
+      end
+
+      it "succeeds in getting post with likes" do
+        like_service(bob).create(@status.guid)
+        like_service(auth.user).create(@status.guid)
+        like_service(alice).create(@status.guid)
+        get(
+          api_v1_post_likes_path(post_id: @status.guid),
+          params: {access_token: access_token}
+        )
+        expect(response.status).to eq(200)
+        likes = response_body(response)
+        expect(likes.length).to eq(3)
+        confirm_like_format(likes, alice)
+        confirm_like_format(likes, bob)
+        confirm_like_format(likes, auth.user)
+      end
+    end
+
+    context "with wrong post id" do
+      it "fails at getting likes" do
+        get(
+          api_v1_post_likes_path(post_id: "badguid"),
+          params: {access_token: access_token}
+        )
+        expect(response.status).to eq(404)
+        expect(response.body).to eq(I18n.t("api.endpoint_errors.posts.post_not_found"))
+      end
+    end
+  end
+
   describe "#create" do
     context "with right post id" do
       it "succeeeds in liking post" do
@@ -27,6 +68,25 @@ describe Api::V1::LikesController do
         expect(likes.length).to eq(1)
         expect(likes[0].author.id).to eq(auth.user.person.id)
       end
+
+      it "fails in liking already liked post" do
+        post(
+          api_v1_post_likes_path(post_id: @status.guid),
+          params: {access_token: access_token}
+        )
+        expect(response.status).to eq(204)
+
+        post(
+          api_v1_post_likes_path(post_id: @status.guid),
+          params: {access_token: access_token}
+        )
+        expect(response.status).to eq(422)
+        expect(response.body).to eq(I18n.t("api.endpoint_errors.likes.like_exists"))
+
+        likes = like_service.find_for_post(@status.guid)
+        expect(likes.length).to eq(1)
+        expect(likes[0].author.id).to eq(auth.user.person.id)
+      end
     end
 
     context "with wrong post id" do
@@ -36,11 +96,12 @@ describe Api::V1::LikesController do
           params: {access_token: access_token}
         )
         expect(response.status).to eq(404)
+        expect(response.body).to eq(I18n.t("api.endpoint_errors.posts.post_not_found"))
       end
     end
   end
 
-  describe "#create" do
+  describe "#delete" do
     before do
       post(
         api_v1_post_likes_path(post_id: @status.guid),
@@ -58,6 +119,24 @@ describe Api::V1::LikesController do
         likes = like_service.find_for_post(@status.guid)
         expect(likes.length).to eq(0)
       end
+
+      it "fails at unliking post user didn't like" do
+        delete(
+          api_v1_post_likes_path(post_id: @status.guid),
+          params: {access_token: access_token}
+        )
+        expect(response.status).to eq(204)
+
+        delete(
+          api_v1_post_likes_path(post_id: @status.guid),
+          params: {access_token: access_token}
+        )
+        expect(response.status).to eq(404)
+        expect(response.body).to eq(I18n.t("api.endpoint_errors.likes.no_like"))
+
+        likes = like_service.find_for_post(@status.guid)
+        expect(likes.length).to eq(0)
+      end
     end
 
     context "with wrong post id" do
@@ -67,11 +146,28 @@ describe Api::V1::LikesController do
           params: {access_token: access_token}
         )
         expect(response.status).to eq(404)
+        expect(response.body).to eq(I18n.t("api.endpoint_errors.posts.post_not_found"))
       end
     end
   end
 
-  def like_service
-    LikeService.new(auth.user)
+  private
+
+  # rubocop:disable Metrics/AbcSize
+  def confirm_like_format(likes, user)
+    like = likes.find {|like_element| like_element["author"]["guid"] == user.guid }
+    author = like["author"]
+    expect(author["diaspora_id"]).to eq(user.diaspora_handle)
+    expect(author["name"]).to eq(user.name)
+    expect(author["avatar"]).to eq(user.profile.image_url)
+  end
+  # rubocop:enable Metrics/AbcSize
+
+  def like_service(user=auth.user)
+    LikeService.new(user)
+  end
+
+  def response_body(response)
+    JSON.parse(response.body)
   end
 end

spec/presenters/likes_presenter_spec.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+describe LikesPresenter do
+  before do
+    @status = alice.post(
+      :status_message,
+      text:   "This is a status message from alice",
+      public: true,
+      to:     "all"
+    )
+    bobs_like_service = LikeService.new(bob)
+    like = bobs_like_service.create(@status.guid)
+    @presenter = LikesPresenter.new(like, bob)
+  end
+
+  describe "#as_api_json" do
+    it "works" do
+      expect(@presenter.as_api_json).to be_present
+    end
+
+    it "confirm API V1 compliance" do
+      like = @presenter.as_api_json
+      expect(like.has_key?(:guid)).to be_truthy
+      author = like[:author]
+      expect(author).not_to be_nil
+      expect(author).to include(guid: bob.guid)
+      expect(author).to include(diaspora_id: bob.diaspora_handle)
+      expect(author).to include(name: bob.name)
+      expect(author).to include(avatar: bob.profile.image_url)
+    end
+  end
+end