Present MRs on Jira development panel integration

ee/changelogs/unreleased/2646-osw-support-mrs-on-jira-dev-panel.yml

+---
+title: Present MRs on Jira development panel integration
+merge_request: 5534
+author:
+type: added

ee/lib/api/github/entities.rb

@@ -109,6 +109,65 @@ module API
           options[:project].repository.commit(repo_branch.dereferenced_target)
         end
       end
+
+      class User < Grape::Entity
+        expose :id
+        expose :username, as: :login
+        expose :url do |user|
+          Gitlab::Routing.url_helpers.user_url(user)
+        end
+      end
+
+      class NoteableComment < Grape::Entity
+        expose :id
+        expose :author, as: :user, using: User
+        expose :note, as: :body
+        expose :created_at
+      end
+
+      class PullRequest < Grape::Entity
+        expose :title
+        expose :assignee, using: User
+        expose :author, as: :user, using: User
+        expose :created_at
+        expose :description, as: :body
+        # Since Jira service requests `/repos/-/jira/pulls` (without project
+        # scope), we need to make it work with ID instead IID.
+        expose :id, as: :number
+        # GitHub doesn't have a "merged" or "closed" state. It's just "open" or
+        # "closed".
+        expose :state do |merge_request|
+          case merge_request.state
+          when 'opened', 'locked'
+            'open'
+          when 'merged'
+            'closed'
+          else
+            merge_request.state
+          end
+        end
+        expose :merged?, as: :merged
+        expose :merged_at do |merge_request|
+          merge_request.metrics&.merged_at
+        end
+        expose :closed_at do |merge_request|
+          merge_request.metrics&.latest_closed_at
+        end
+        expose :updated_at
+        expose :html_url do |merge_request|
+          Gitlab::UrlBuilder.build(merge_request)
+        end
+        expose :head do
+          expose :source_branch, as: :label
+          expose :source_branch, as: :ref
+          expose :source_project, as: :repo, using: Repository
+        end
+        expose :base do
+          expose :target_branch, as: :label
+          expose :target_branch, as: :ref
+          expose :target_project, as: :repo, using: Repository
+        end
+      end
     end
   end
 end

ee/lib/api/v3/github.rb

@@ -6,6 +6,8 @@
 module API
   module V3
     class Github < Grape::API
+      JIRA_DEV_PANEL_FEATURE = :jira_dev_panel_integration.freeze
+
       include PaginationParams
 
       before do
@@ -25,9 +27,36 @@ module API
 
         def find_project_with_access(full_path)
           project = find_project!(full_path)
-          not_found! unless project.feature_available?(:jira_dev_panel_integration)
+          not_found! unless licensed_project?(project)
           project
         end
+
+        def find_merge_requests
+          merge_requests = authorized_merge_requests.reorder(updated_at: :desc).preload(:target_project)
+          merge_requests = paginate(merge_requests)
+          merge_requests.select { |mr| licensed_project?(mr.target_project) }
+        end
+
+        def find_merge_request_with_access(id, access_level = :read_merge_request)
+          merge_request = authorized_merge_requests.find_by(id: id)
+          not_found! unless can?(current_user, access_level, merge_request)
+          merge_request
+        end
+
+        def authorized_merge_requests
+          MergeRequestsFinder.new(current_user, authorized_only: true).execute
+        end
+
+        def find_notes(noteable)
+          # They're not presented on Jira Dev Panel ATM. A comments count with a
+          # redirect link is presented.
+          notes = paginate(noteable.notes.user.reorder(nil))
+          notes.reject { |n| n.cross_reference_not_visible_for?(current_user) }
+        end
+
+        def licensed_project?(project)
+          project.feature_available?(JIRA_DEV_PANEL_FEATURE)
+        end
       end
 
       resource :orgs do
@@ -47,14 +76,43 @@ module API
           use :pagination
         end
         get ':namespace/repos' do
-          projects = current_user.authorized_projects.select { |project| project.feature_available?(:jira_dev_panel_integration) }
+          projects = current_user.authorized_projects.select { |project| licensed_project?(project) }
           projects = ::Kaminari.paginate_array(projects)
           present paginate(projects), with: ::API::Github::Entities::Repository
         end
       end
 
+      # Jira dev panel integration weirdly requests for "/-/jira/pulls" instead
+      # "/api/v3/repos/<namespace>/<project>/pulls". This forces us into
+      # returning _all_ Merge Requests from authorized projects (user is a member),
+      # instead just the authorized MRs from a project.
+      # Jira handles the filtering, presenting just MRs mentioning the Jira
+      # issue ID on the MR title / description.
       resource :repos do
         get '/-/jira/pulls' do
+          present find_merge_requests, with: ::API::Github::Entities::PullRequest
+        end
+
+        # In Github, each Merge Request is automatically also an issue.
+        # Therefore we return its comments here.
+        # It'll present _just_ the comments counting with a link to GitLab on
+        # Jira dev panel, not the actual note content.
+        #
+        get '/-/jira/issues/:id/comments' do
+          merge_request = find_merge_request_with_access(params[:id])
+
+          present find_notes(merge_request), with: ::API::Github::Entities::NoteableComment
+        end
+
+        # This refers to "review" comments but Jira dev panel doesn't seem to
+        # present it accordingly.
+        get '/-/jira/pulls/:id/comments' do
+          present []
+        end
+
+        # Commits are not presented within "Pull Requests" modal on Jira dev
+        # panel.
+        get '/-/jira/pulls/:id/commits' do
           present []
         end
 

ee/spec/fixtures/api/schemas/entities/github/pull_requests.json

+{
+  "type": "array",
+  "items": {
+    "type": "object",
+    "properties" : {
+      "title": { "type": "string" },
+      "created_at": { "type": "string" },
+      "body": { "type": ["string", "null"] },
+      "id": { "type": "integer" },
+      "number": { "type": "integer" },
+      "state": { "type": "string" },
+      "html_url": { "type": "string" },
+      "merged": { "type": "boolean" },
+      "merged_at": { "type": ["date", "null"] },
+      "closed_at": { "type": ["date", "null"] },
+      "updated_at": { "type": "date" },
+      "assignee": { 
+        "type": "object",
+        "required": ["id", "login", "url"],
+        "properties" : {
+          "id": { "type": "integer" },
+          "login": { "type": "string" },
+          "url": { "type": "string" }
+        },
+        "additionalProperties": false
+      },
+      "author": { 
+        "type": "object",
+        "required": ["id", "login", "url"],
+        "properties" : {
+          "id": { "type": "integer" },
+          "login": { "type": "string" },
+          "url": { "type": "string" }
+        },
+        "additionalProperties": false
+      },
+      "head": { 
+        "type": "object",
+        "required": ["label", "ref", "repo"],
+        "properties" : {
+          "label": { "type": "string" },
+          "ref": { "type": "string" },
+          "repo": {
+            "oneOf": [
+              { "type": "null" },
+              { "$ref": "repository.json" }
+            ]
+          }
+        },
+        "additionalProperties": false
+      },
+      "base": { 
+        "type": "object",
+        "required": ["label", "ref", "repo"],
+        "properties" : {
+          "label": { "type": "string" },
+          "ref": { "type": "string" },
+          "repo": {
+            "oneOf": [
+              { "type": "null" },
+              { "$ref": "repository.json" }
+            ]
+          }
+        },
+        "additionalProperties": false
+      },
+      "additionalProperties": false
+    }
+  }
+}

ee/spec/fixtures/api/schemas/entities/github/repository.json

+{
+    "type": "object",
+    "properties": {
+        "id": { "type": "integer" },
+        "name": { "type": "string" },
+        "owner": {
+            "type": "object",
+            "required": ["login"],
+            "properties" : {
+                "login": { "type": "string" }
+            },
+            "additionalProperties": false
+        },
+        "additionalProperties": false
+    }
+}

ee/spec/requests/api/v3/github_spec.rb

@@ -30,9 +30,79 @@ describe API::V3::Github do
   end
 
   describe 'GET /-/jira/pulls' do
-    it 'returns an empty array' do
+    let(:assignee) { create(:user) }
+    let!(:merge_request) do
+      create(:merge_request, source_project: project, target_project: project, author: user, assignee: assignee)
+    end
+
+    it 'returns an array of merge requests with github format' do
+      stub_licensed_features(jira_dev_panel_integration: true)
+
       get v3_api('/repos/-/jira/pulls', user)
 
+      expect(response).to have_gitlab_http_status(200)
+      expect(json_response).to be_an(Array)
+      expect(json_response.size).to eq(1)
+      expect(response).to match_response_schema('entities/github/pull_requests', dir: 'ee')
+    end
+  end
+
+  describe 'GET /-/jira/issues/:id/comments' do
+    context 'when user has access to the merge request' do
+      let(:merge_request) do
+        create(:merge_request, source_project: project, target_project: project)
+      end
+      let!(:note) do
+        create(:note, project: project, noteable: merge_request)
+      end
+
+      it 'returns an array of notes' do
+        stub_licensed_features(jira_dev_panel_integration: true)
+
+        get v3_api("/repos/-/jira/issues/#{merge_request.id}/comments", user)
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(json_response).to be_an(Array)
+        expect(json_response.size).to eq(1)
+      end
+    end
+
+    context 'when user has no access to the merge request' do
+      let(:private_project) { create(:project, :private) }
+      let(:merge_request) do
+        create(:merge_request, source_project: private_project, target_project: private_project)
+      end
+      let!(:note) do
+        create(:note, project: private_project, noteable: merge_request)
+      end
+
+      before do
+        private_project.add_guest(user)
+      end
+
+      it 'returns 404' do
+        stub_licensed_features(jira_dev_panel_integration: true)
+
+        get v3_api("/repos/-/jira/issues/#{merge_request.id}/comments", user)
+
+        expect(response).to have_gitlab_http_status(404)
+      end
+    end
+  end
+
+  describe 'GET /-/jira/pulls/:id/commits' do
+    it 'returns an empty array' do
+      get v3_api("/repos/-/jira/pulls/xpto/commits", user)
+
+      expect(response).to have_gitlab_http_status(200)
+      expect(json_response).to eq([])
+    end
+  end
+
+  describe 'GET /-/jira/pulls/:id/comments' do
+    it 'returns an empty array' do
+      get v3_api("/repos/-/jira/pulls/xpto/comments", user)
+
       expect(response).to have_gitlab_http_status(200)
       expect(json_response).to eq([])
     end