API: return current users like, reshare and subcription status in post infos

app/controllers/api/v1/posts_controller.rb

@@ -108,7 +108,7 @@ module Api
       end
 
       def post_as_json(post)
-        PostPresenter.new(post).as_api_response
+        PostPresenter.new(post, current_user).as_api_response
       end
     end
   end

app/presenters/post_presenter.rb

@@ -32,7 +32,8 @@ class PostPresenter < BasePresenter
       poll:                  PollPresenter.new(@post.poll, current_user).as_api_json,
       mentioned_people:      build_mentioned_people_json,
       photos:                build_photos_json,
-      root:                  root_api_response
+      root:                  root_api_response,
+      own_interaction_state: build_own_interaction_state
     }.compact
   end
 
@@ -90,7 +91,7 @@ class PostPresenter < BasePresenter
       location:                     @post.post_location,
       poll:                         @post.poll,
       poll_participation_answer_id: poll_participation_answer_id,
-      participation:                participate?,
+      participation:                participates?,
       interactions:                 build_interactions_json
     }
   end
@@ -140,6 +141,22 @@ class PostPresenter < BasePresenter
     }
   end
 
+  def build_own_interaction_state
+    if current_user
+      {
+        liked:      @post.likes.where(author: current_user.person).exists?,
+        reshared:   @post.reshares.where(author: current_user.person).exists?,
+        subscribed: participates?
+      }
+    else
+      {
+        liked:      false,
+        reshared:   false,
+        subscribed: false
+      }
+    end
+  end
+
   def user_like
     @post.like_for(current_user).try(:as_api_response, :backbone)
   end
@@ -152,7 +169,7 @@ class PostPresenter < BasePresenter
     @post.poll&.participation_answer(current_user)&.poll_answer_id if user_signed_in?
   end
 
-  def participate?
+  def participates?
     user_signed_in? && current_user.participations.where(target_id: @post).exists?
   end
 

lib/schemas/api_v1.json

@@ -256,6 +256,16 @@
           "required": ["comments", "likes", "reshares"],
           "additionalProperties": false
         },
+        "own_interaction_state": {
+          "type": "object",
+          "properties": {
+            "liked": { "type": "boolean" },
+            "reshared": { "type": "boolean" },
+            "subscribed": { "type": "boolean" }
+          },
+          "required": ["liked", "reshared", "subscribed"],
+          "additionalProperties": false
+        },
         "mentioned_people": {
           "type": "array",
           "items": { "$ref": "https://diaspora.software/api/v1/schema.json#/definitions/short_profile" }
@@ -306,7 +316,7 @@
           "additionalProperties": false
         }
       },
-      "required": ["guid", "created_at", "title", "body", "public", "nsfw", "author", "interaction_counters", "mentioned_people", "photos"]
+      "required": ["guid", "created_at", "title", "body", "public", "nsfw", "author", "interaction_counters", "own_interaction_state",  "mentioned_people", "photos"]
     },
 
     "post": {

spec/integration/api/posts_controller_spec.rb

@@ -102,6 +102,29 @@ describe Api::V1::PostsController do
       end
     end
 
+    context "access interacted with post by ID" do
+      it "gets post" do
+        auth.user.like!(@status)
+        auth.user.reshare!(@status)
+        @status.reload
+
+        get(
+          api_v1_post_path(@status.guid),
+          params: {
+            access_token: access_token
+          }
+        )
+        expect(response.status).to eq(200)
+        post = response_body(response)
+        confirm_post_format(post, alice, @status, [bob, eve])
+        expect(post["own_interaction_state"]["liked"]).to be true
+        expect(post["own_interaction_state"]["reshared"]).to be true
+        expect(post["own_interaction_state"]["subscribed"]).to be true
+
+        expect(post.to_json).to match_json_schema(:api_v1_schema, fragment: "#/definitions/post")
+      end
+    end
+
     context "access reshare style post by post ID" do
       it "gets post" do
         reshare_post = FactoryGirl.create(:reshare, root: @status, author: bob.person)
@@ -659,6 +682,7 @@ describe Api::V1::PostsController do
     confirm_post_top_level(post, reference_post)
     confirm_person_format(post["author"], user)
     confirm_interactions(post["interaction_counters"], reference_post)
+    confirm_own_interaction_state(post["own_interaction_state"], reference_post)
 
     mentions.each do |mention|
       post_mentions = post["mentioned_people"]
@@ -689,6 +713,12 @@ describe Api::V1::PostsController do
     expect(interactions["reshares"]).to eq(reference_post.reshares_count)
   end
 
+  def confirm_own_interaction_state(state, reference_post)
+    expect(state["liked"]).to eq(reference_post.likes.where(author: auth.user.person).exists?)
+    expect(state["reshared"]).to eq(reference_post.reshares.where(author: auth.user.person).exists?)
+    expect(state["subscribed"]).to eq(reference_post.participations.where(author: auth.user.person).exists?)
+  end
+
   def confirm_person_format(post_person, user)
     expect(post_person["guid"]).to eq(user.guid)
     expect(post_person["diaspora_id"]).to eq(user.diaspora_handle)