Merge branch '52559-applications-api-get-delete' into 'master'

Add Applications API endpoints for listing and deleting entries.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/52559

See merge request https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22296

8 files changed, 181 insertions, 15 deletions

diff --git a/app/controllers/admin/applications_controller.rb b/app/controllers/admin/applications_controller.rb
index 00d2cc01192..6fc336714b6 100644
--- a/app/controllers/admin/applications_controller.rb
+++ b/app/controllers/admin/applications_controller.rb
@@ -6,11 +6,9 @@ class Admin::ApplicationsController < Admin::ApplicationController
   before_action :set_application, only: [:show, :edit, :update, :destroy]
   before_action :load_scopes, only: [:new, :create, :edit, :update]
 
-  # rubocop: disable CodeReuse/ActiveRecord
   def index
-    @applications = Doorkeeper::Application.where("owner_id IS NULL")
+    @applications = ApplicationsFinder.new.execute
   end
-  # rubocop: enable CodeReuse/ActiveRecord
 
   def show
   end
@@ -49,11 +47,9 @@ class Admin::ApplicationsController < Admin::ApplicationController
 
   private
 
-  # rubocop: disable CodeReuse/ActiveRecord
   def set_application
-    @application = Doorkeeper::Application.where("owner_id IS NULL").find(params[:id])
+    @application = ApplicationsFinder.new(id: params[:id]).execute
   end
-  # rubocop: enable CodeReuse/ActiveRecord
 
   # Only allow a trusted parameter "white list" through.
   def application_params
diff --git a/app/finders/applications_finder.rb b/app/finders/applications_finder.rb
new file mode 100644
index 00000000000..3ded90f3fd5
--- /dev/null
+++ b/app/finders/applications_finder.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class ApplicationsFinder
+  attr_reader :params
+
+  def initialize(params = {})
+    @params = params
+  end
+
+  def execute
+    applications = Doorkeeper::Application.where(owner_id: nil) # rubocop: disable CodeReuse/ActiveRecord
+    by_id(applications)
+  end
+
+  private
+
+  def by_id(applications)
+    return applications unless params[:id]
+
+    Doorkeeper::Application.find_by(id: params[:id]) # rubocop: disable CodeReuse/ActiveRecord
+  end
+end
diff --git a/changelogs/unreleased/52559-applications-api-get-delete.yml b/changelogs/unreleased/52559-applications-api-get-delete.yml
new file mode 100644
index 00000000000..19f98a2bb56
--- /dev/null
+++ b/changelogs/unreleased/52559-applications-api-get-delete.yml
@@ -0,0 +1,5 @@
+---
+title: Add Applications API endpoints for listing and deleting entries.
+merge_request: 22296
+author: Jean-Baptiste Vasseur
+type: added
diff --git a/doc/api/applications.md b/doc/api/applications.md
index 6d244594b71..d74a3cdf5c1 100644
--- a/doc/api/applications.md
+++ b/doc/api/applications.md
@@ -4,12 +4,12 @@
 
 [ce-8160]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8160
 
+Only admin user can use the Applications API.
+
 ## Create a application
 
 Create a application by posting a JSON payload.
 
-User must be admin to do that.
-
 Returns `200` if the request succeeds.
 
 ```
@@ -30,8 +30,55 @@ Example response:
 
 ```json
 {
+    "id":1,
     "application_id": "5832fc6e14300a0d962240a8144466eef4ee93ef0d218477e55f11cf12fc3737",
+    "application_name": "MyApplication",
     "secret": "ee1dd64b6adc89cf7e2c23099301ccc2c61b441064e9324d963c46902a85ec34",
     "callback_url": "http://redirect.uri"
 }
 ```
+
+## List all applications
+
+List all registered applications.
+
+```
+GET /applications
+```
+
+```bash
+curl --request GET --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/applications
+```
+
+Example response:
+
+```json
+[
+    {
+        "id":1,
+        "application_id": "5832fc6e14300a0d962240a8144466eef4ee93ef0d218477e55f11cf12fc3737",
+        "application_name": "MyApplication",
+        "callback_url": "http://redirect.uri"
+    }
+]
+```
+
+> Note: the `secret` value will not be exposed by this API.
+
+## Delete an application
+
+Delete a specific application.
+
+Returns `204` if the request succeeds.
+
+```
+DELETE /applications/:id
+```
+
+Parameters:
+
+- `id` (required) - The id of the application (not the application_id)
+
+```bash
+curl --request DELETE --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/applications/:id
+```
diff --git a/lib/api/applications.rb b/lib/api/applications.rb
index f29cd7fc003..92717e04543 100644
--- a/lib/api/applications.rb
+++ b/lib/api/applications.rb
@@ -24,6 +24,22 @@ module API
           render_validation_error! application
         end
       end
+
+      desc 'Get applications' do
+        success Entities::Application
+      end
+      get do
+        applications = ApplicationsFinder.new.execute
+        present applications, with: Entities::Application
+      end
+
+      desc 'Delete an application'
+      delete ':id' do
+        application = ApplicationsFinder.new(params).execute
+        application.destroy
+
+        status 204
+      end
     end
   end
 end
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 65855e8aac4..18c30723d73 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -1412,7 +1412,9 @@ module API
     end
 
     class Application < Grape::Entity
+      expose :id
       expose :uid, as: :application_id
+      expose :name, as: :application_name
       expose :redirect_uri, as: :callback_url
     end
 
diff --git a/spec/finders/applications_finder_spec.rb b/spec/finders/applications_finder_spec.rb
new file mode 100644
index 00000000000..14d6b35cc27
--- /dev/null
+++ b/spec/finders/applications_finder_spec.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ApplicationsFinder do
+  let(:application1) { create(:application, name: 'some_application', owner: nil, redirect_uri: 'http://some_application.url', scopes: '') }
+  let(:application2) { create(:application, name: 'another_application', owner: nil, redirect_uri: 'http://other_application.url', scopes: '') }
+
+  describe '#execute' do
+    it 'returns an array of applications' do
+      found = described_class.new.execute
+
+      expect(found).to match_array([application1, application2])
+    end
+    it 'returns the application by id' do
+      params = { id: application1.id }
+      found = described_class.new(params).execute
+
+      expect(found).to match(application1)
+    end
+  end
+end
diff --git a/spec/requests/api/applications_spec.rb b/spec/requests/api/applications_spec.rb
index f56bc932f40..270e12bf201 100644
--- a/spec/requests/api/applications_spec.rb
+++ b/spec/requests/api/applications_spec.rb
@@ -5,6 +5,7 @@ describe API::Applications, :api do
 
   let(:admin_user) { create(:user, admin: true) }
   let(:user) { create(:user, admin: false) }
+  let!(:application) { create(:application, name: 'another_application', redirect_uri: 'http://other_application.url', scopes: '') }
 
   describe 'POST /applications' do
     context 'authenticated and authorized user' do
@@ -15,7 +16,7 @@ describe API::Applications, :api do
 
         application = Doorkeeper::Application.find_by(name: 'application_name', redirect_uri: 'http://application.url')
 
-        expect(response).to have_http_status 201
+        expect(response).to have_gitlab_http_status(201)
         expect(json_response).to be_a Hash
         expect(json_response['application_id']).to eq application.uid
         expect(json_response['secret']).to eq application.secret
@@ -27,7 +28,7 @@ describe API::Applications, :api do
           post api('/applications', admin_user), name: 'application_name', redirect_uri: 'wrong_url_format', scopes: ''
         end.not_to change { Doorkeeper::Application.count }
 
-        expect(response).to have_http_status 400
+        expect(response).to have_gitlab_http_status(400)
         expect(json_response).to be_a Hash
         expect(json_response['message']['redirect_uri'][0]).to eq('must be an absolute URI.')
       end
@@ -37,7 +38,7 @@ describe API::Applications, :api do
           post api('/applications', admin_user), redirect_uri: 'http://application.url', scopes: ''
         end.not_to change { Doorkeeper::Application.count }
 
-        expect(response).to have_http_status 400
+        expect(response).to have_gitlab_http_status(400)
         expect(json_response).to be_a Hash
         expect(json_response['error']).to eq('name is missing')
       end
@@ -47,7 +48,7 @@ describe API::Applications, :api do
           post api('/applications', admin_user), name: 'application_name', scopes: ''
         end.not_to change { Doorkeeper::Application.count }
 
-        expect(response).to have_http_status 400
+        expect(response).to have_gitlab_http_status(400)
         expect(json_response).to be_a Hash
         expect(json_response['error']).to eq('redirect_uri is missing')
       end
@@ -57,7 +58,7 @@ describe API::Applications, :api do
           post api('/applications', admin_user), name: 'application_name', redirect_uri: 'http://application.url'
         end.not_to change { Doorkeeper::Application.count }
 
-        expect(response).to have_http_status 400
+        expect(response).to have_gitlab_http_status(400)
         expect(json_response).to be_a Hash
         expect(json_response['error']).to eq('scopes is missing')
       end
@@ -69,7 +70,7 @@ describe API::Applications, :api do
           post api('/applications', user), name: 'application_name', redirect_uri: 'http://application.url', scopes: ''
         end.not_to change { Doorkeeper::Application.count }
 
-        expect(response).to have_http_status 403
+        expect(response).to have_gitlab_http_status(403)
       end
     end
 
@@ -79,7 +80,62 @@ describe API::Applications, :api do
           post api('/applications'), name: 'application_name', redirect_uri: 'http://application.url'
         end.not_to change { Doorkeeper::Application.count }
 
-        expect(response).to have_http_status 401
+        expect(response).to have_gitlab_http_status(401)
+      end
+    end
+  end
+
+  describe 'GET /applications' do
+    context 'authenticated and authorized user' do
+      it 'can list application' do
+        get api('/applications', admin_user)
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(json_response).to be_a(Array)
+      end
+    end
+
+    context 'authorized user without authorization' do
+      it 'cannot list application' do
+        get api('/applications', user)
+
+        expect(response).to have_gitlab_http_status(403)
+      end
+    end
+
+    context 'non-authenticated user' do
+      it 'cannot list application' do
+        get api('/applications')
+
+        expect(response).to have_gitlab_http_status(401)
+      end
+    end
+  end
+
+  describe 'DELETE /applications/:id' do
+    context 'authenticated and authorized user' do
+      it 'can delete an application' do
+        expect do
+          delete api("/applications/#{application.id}", admin_user)
+        end.to change { Doorkeeper::Application.count }.by(-1)
+
+        expect(response).to have_gitlab_http_status(204)
+      end
+    end
+
+    context 'authorized user without authorization' do
+      it 'cannot delete an application' do
+        delete api("/applications/#{application.id}", user)
+
+        expect(response).to have_gitlab_http_status(403)
+      end
+    end
+
+    context 'non-authenticated user' do
+      it 'cannot delete an application' do
+        delete api("/applications/#{application.id}")
+
+        expect(response).to have_gitlab_http_status(401)
       end
     end
   end