Merge branch 'zj-pipelines-api-endpoints' into 'master'

Add endpoints for pipelines

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5837

8 files changed, 425 insertions, 18 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 0324a5be080..71128413ff9 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -48,6 +48,7 @@ v 8.11.0 (unreleased)
   - Show deployment status on merge requests with external URLs
   - Clean up unused routes (Josef Strzibny)
   - Fix issue on empty project to allow developers to only push to protected branches if given permission
+  - API: Add enpoints for pipelines
   - Add green outline to New Branch button. !5447 (winniehell)
   - Optimize generating of cache keys for issues and notes
   - Fix repository push email formatting in Outlook
diff --git a/doc/api/README.md b/doc/api/README.md
index f3117815c7c..3e79cce0120 100644
--- a/doc/api/README.md
+++ b/doc/api/README.md
@@ -26,6 +26,7 @@ following locations:
 - [Open source license templates](licenses.md)
 - [Namespaces](namespaces.md)
 - [Notes](notes.md) (comments)
+- [Pipelines](pipelines.md)
 - [Projects](projects.md) including setting Webhooks
 - [Project Access Requests](access_requests.md)
 - [Project Members](members.md)
diff --git a/doc/api/pipelines.md b/doc/api/pipelines.md
new file mode 100644
index 00000000000..847408a7f61
--- /dev/null
+++ b/doc/api/pipelines.md
@@ -0,0 +1,207 @@
+# Pipelines API
+
+## List project pipelines
+
+> [Introduced][ce-5837] in GitLab 8.11
+
+```
+GET /projects/:id/pipelines
+```
+
+| Attribute | Type    | Required | Description         |
+|-----------|---------|----------|---------------------|
+| `id`      | integer | yes      | The ID of a project |
+
+```
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/pipelines"
+```
+
+Example of response
+
+```json
+[
+  {
+    "id": 47,
+    "status": "pending",
+    "ref": "new-pipeline",
+    "sha": "a91957a858320c0e17f3a0eca7cfacbff50ea29a",
+    "before_sha": "a91957a858320c0e17f3a0eca7cfacbff50ea29a",
+    "tag": false,
+    "yaml_errors": null,
+    "user": {
+      "name": "Administrator",
+      "username": "root",
+      "id": 1,
+      "state": "active",
+      "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon",
+      "web_url": "http://localhost:3000/u/root"
+    },
+    "created_at": "2016-08-16T10:23:19.007Z",
+    "updated_at": "2016-08-16T10:23:19.216Z",
+    "started_at": null,
+    "finished_at": null,
+    "committed_at": null,
+    "duration": null
+  },
+  {
+    "id": 48,
+    "status": "pending",
+    "ref": "new-pipeline",
+    "sha": "eb94b618fb5865b26e80fdd8ae531b7a63ad851a",
+    "before_sha": "eb94b618fb5865b26e80fdd8ae531b7a63ad851a",
+    "tag": false,
+    "yaml_errors": null,
+    "user": {
+      "name": "Administrator",
+      "username": "root",
+      "id": 1,
+      "state": "active",
+      "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon",
+      "web_url": "http://localhost:3000/u/root"
+    },
+    "created_at": "2016-08-16T10:23:21.184Z",
+    "updated_at": "2016-08-16T10:23:21.314Z",
+    "started_at": null,
+    "finished_at": null,
+    "committed_at": null,
+    "duration": null
+  }
+]
+```
+
+## Get a single pipeline
+
+> [Introduced][ce-5837] in GitLab 8.11
+
+```
+GET /projects/:id/pipelines/:pipeline_id
+```
+
+| Attribute  | Type    | Required | Description         |
+|------------|---------|----------|---------------------|
+| `id`       | integer | yes      | The ID of a project |
+| `pipeline_id` | integer | yes      | The ID of a pipeline   |
+
+```
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/pipeline/46"
+```
+
+Example of response
+
+```json
+{
+  "id": 46,
+  "status": "success",
+  "ref": "master",
+  "sha": "a91957a858320c0e17f3a0eca7cfacbff50ea29a",
+  "before_sha": "a91957a858320c0e17f3a0eca7cfacbff50ea29a",
+  "tag": false,
+  "yaml_errors": null,
+  "user": {
+    "name": "Administrator",
+    "username": "root",
+    "id": 1,
+    "state": "active",
+    "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon",
+    "web_url": "http://localhost:3000/u/root"
+  },
+  "created_at": "2016-08-11T11:28:34.085Z",
+  "updated_at": "2016-08-11T11:32:35.169Z",
+  "started_at": null,
+  "finished_at": "2016-08-11T11:32:35.145Z",
+  "committed_at": null,
+  "duration": null
+}
+```
+
+## Retry failed builds in a pipeline
+
+> [Introduced][ce-5837] in GitLab 8.11
+
+```
+POST /projects/:id/pipelines/:pipeline_id/retry
+```
+
+| Attribute  | Type    | Required | Description         |
+|------------|---------|----------|---------------------|
+| `id`       | integer | yes      | The ID of a project |
+| `pipeline_id` | integer | yes   | The ID of a pipeline |
+
+```
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/pipelines/46/retry"
+```
+
+Response:
+
+```json
+{
+  "id": 46,
+  "status": "pending",
+  "ref": "master",
+  "sha": "a91957a858320c0e17f3a0eca7cfacbff50ea29a",
+  "before_sha": "a91957a858320c0e17f3a0eca7cfacbff50ea29a",
+  "tag": false,
+  "yaml_errors": null,
+  "user": {
+    "name": "Administrator",
+    "username": "root",
+    "id": 1,
+    "state": "active",
+    "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon",
+    "web_url": "http://localhost:3000/u/root"
+  },
+  "created_at": "2016-08-11T11:28:34.085Z",
+  "updated_at": "2016-08-11T11:32:35.169Z",
+  "started_at": null,
+  "finished_at": "2016-08-11T11:32:35.145Z",
+  "committed_at": null,
+  "duration": null
+}
+```
+
+## Cancel a pipelines builds
+
+> [Introduced][ce-5837] in GitLab 8.11
+
+```
+POST /projects/:id/pipelines/:pipeline_id/cancel
+```
+
+| Attribute  | Type    | Required | Description         |
+|------------|---------|----------|---------------------|
+| `id`       | integer | yes      | The ID of a project |
+| `pipeline_id` | integer | yes   | The ID of a pipeline |
+
+```
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" "https://gitlab.example.com/api/v3/projects/1/pipelines/46/cancel"
+```
+
+Response:
+
+```json
+{
+  "id": 46,
+  "status": "canceled",
+  "ref": "master",
+  "sha": "a91957a858320c0e17f3a0eca7cfacbff50ea29a",
+  "before_sha": "a91957a858320c0e17f3a0eca7cfacbff50ea29a",
+  "tag": false,
+  "yaml_errors": null,
+  "user": {
+    "name": "Administrator",
+    "username": "root",
+    "id": 1,
+    "state": "active",
+    "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80&d=identicon",
+    "web_url": "http://localhost:3000/u/root"
+  },
+  "created_at": "2016-08-11T11:28:34.085Z",
+  "updated_at": "2016-08-11T11:32:35.169Z",
+  "started_at": null,
+  "finished_at": "2016-08-11T11:32:35.145Z",
+  "committed_at": null,
+  "duration": null
+}
+```
+
+[ce-5837]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5837
diff --git a/lib/api/api.rb b/lib/api/api.rb
index d43af3f24e9..d9261c97908 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -56,6 +56,7 @@ module API
     mount ::API::Milestones
     mount ::API::Namespaces
     mount ::API::Notes
+    mount ::API::Pipelines
     mount ::API::ProjectHooks
     mount ::API::ProjectSnippets
     mount ::API::Projects
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index ec455e67329..99eb8af5ab7 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -500,6 +500,14 @@ module API
       expose :key, :value
     end
 
+    class Pipeline < Grape::Entity
+      expose :id, :status, :ref, :sha, :before_sha, :tag, :yaml_errors
+
+      expose :user, with: Entities::UserBasic
+      expose :created_at, :updated_at, :started_at, :finished_at, :committed_at
+      expose :duration
+    end
+
     class Environment < Grape::Entity
       expose :id, :name, :external_url
     end
diff --git a/lib/api/pipelines.rb b/lib/api/pipelines.rb
new file mode 100644
index 00000000000..2aae75c471d
--- /dev/null
+++ b/lib/api/pipelines.rb
@@ -0,0 +1,74 @@
+module API
+  class Pipelines < Grape::API
+    before { authenticate! }
+
+    params do
+      requires :id, type: String, desc: 'The project ID'
+    end
+    resource :projects do
+      desc 'Get all Pipelines of the project' do
+        detail 'This feature was introduced in GitLab 8.11.'
+        success Entities::Pipeline
+      end
+      params do
+        optional :page,     type: Integer, desc: 'Page number of the current request'
+        optional :per_page, type: Integer, desc: 'Number of items per page'
+      end
+      get ':id/pipelines' do
+        authorize! :read_pipeline, user_project
+
+        present paginate(user_project.pipelines), with: Entities::Pipeline
+      end
+
+      desc 'Gets a specific pipeline for the project' do
+        detail 'This feature was introduced in GitLab 8.11'
+        success Entities::Pipeline
+      end
+      params do
+        requires :pipeline_id, type: Integer, desc: 'The pipeline ID'
+      end
+      get ':id/pipelines/:pipeline_id' do
+        authorize! :read_pipeline, user_project
+
+        present pipeline, with: Entities::Pipeline
+      end
+
+      desc 'Retry failed builds in the pipeline' do
+        detail 'This feature was introduced in GitLab 8.11.'
+        success Entities::Pipeline
+      end
+      params do
+        requires :pipeline_id, type: Integer,  desc: 'The pipeline ID'
+      end
+      post ':id/pipelines/:pipeline_id/retry' do
+        authorize! :update_pipeline, user_project
+
+        pipeline.retry_failed(current_user)
+
+        present pipeline, with: Entities::Pipeline
+      end
+
+      desc 'Cancel all builds in the pipeline' do
+        detail 'This feature was introduced in GitLab 8.11.'
+        success Entities::Pipeline
+      end
+      params do
+        requires :pipeline_id, type: Integer,  desc: 'The pipeline ID'
+      end
+      post ':id/pipelines/:pipeline_id/cancel' do
+        authorize! :update_pipeline, user_project
+
+        pipeline.cancel_running
+
+        status 200
+        present pipeline.reload, with: Entities::Pipeline
+      end
+    end
+
+    helpers do
+      def pipeline
+        @pipeline ||= user_project.pipelines.find(params[:pipeline_id])
+      end
+    end
+  end
+end
diff --git a/spec/factories/ci/pipelines.rb b/spec/factories/ci/pipelines.rb
index 04d66020c87..ac2a1ba5dff 100644
--- a/spec/factories/ci/pipelines.rb
+++ b/spec/factories/ci/pipelines.rb
@@ -1,21 +1,3 @@
-# == Schema Information
-#
-# Table name: commits
-#
-#  id             :integer          not null, primary key
-#  project_id     :integer
-#  ref            :string(255)
-#  sha            :string(255)
-#  before_sha     :string(255)
-#  push_data      :text
-#  created_at     :datetime
-#  updated_at     :datetime
-#  tag            :boolean          default(FALSE)
-#  yaml_errors    :text
-#  committed_at   :datetime
-#  gl_project_id  :integer
-#
-
 FactoryGirl.define do
   factory :ci_empty_pipeline, class: Ci::Pipeline do
     ref 'master'
diff --git a/spec/requests/api/pipelines_spec.rb b/spec/requests/api/pipelines_spec.rb
new file mode 100644
index 00000000000..7011bdc9ec0
--- /dev/null
+++ b/spec/requests/api/pipelines_spec.rb
@@ -0,0 +1,133 @@
+require 'spec_helper'
+
+describe API::API, api: true do
+  include ApiHelpers
+
+  let(:user)        { create(:user) }
+  let(:non_member)  { create(:user) }
+  let(:project)     { create(:project, creator_id: user.id) }
+
+  let!(:pipeline) do
+    create(:ci_empty_pipeline, project: project, sha: project.commit.id,
+                               ref: project.default_branch)
+  end
+
+  before { project.team << [user, :master] }
+
+  describe 'GET /projects/:id/pipelines ' do
+    it_behaves_like 'a paginated resources' do
+      let(:request) { get api("/projects/#{project.id}/pipelines", user) }
+    end
+
+    context 'authorized user' do
+      it 'returns project pipelines' do
+        get api("/projects/#{project.id}/pipelines", user)
+
+        expect(response).to have_http_status(200)
+        expect(json_response).to be_an Array
+        expect(json_response.first['sha']).to match /\A\h{40}\z/
+        expect(json_response.first['id']).to eq pipeline.id
+      end
+    end
+
+    context 'unauthorized user' do
+      it 'does not return project pipelines' do
+        get api("/projects/#{project.id}/pipelines", non_member)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq '404 Project Not Found'
+        expect(json_response).not_to be_an Array
+      end
+    end
+  end
+
+  describe 'GET /projects/:id/pipelines/:pipeline_id' do
+    context 'authorized user' do
+      it 'returns project pipelines' do
+        get api("/projects/#{project.id}/pipelines/#{pipeline.id}", user)
+
+        expect(response).to have_http_status(200)
+        expect(json_response['sha']).to match /\A\h{40}\z/
+      end
+
+      it 'returns 404 when it does not exist' do
+        get api("/projects/#{project.id}/pipelines/123456", user)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq '404 Not found'
+        expect(json_response['id']).to be nil
+      end
+    end
+
+    context 'unauthorized user' do
+      it 'should not return a project pipeline' do
+        get api("/projects/#{project.id}/pipelines/#{pipeline.id}", non_member)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq '404 Project Not Found'
+        expect(json_response['id']).to be nil
+      end
+    end
+  end
+
+  describe 'POST /projects/:id/pipelines/:pipeline_id/retry' do
+    context 'authorized user' do
+      let!(:pipeline) do
+        create(:ci_pipeline, project: project, sha: project.commit.id,
+                             ref: project.default_branch)
+      end
+
+      let!(:build) { create(:ci_build, :failed, pipeline: pipeline) }
+
+      it 'retries failed builds' do
+        expect do
+          post api("/projects/#{project.id}/pipelines/#{pipeline.id}/retry", user)
+        end.to change { pipeline.builds.count }.from(1).to(2)
+
+        expect(response).to have_http_status(201)
+        expect(build.reload.retried?).to be true
+      end
+    end
+
+    context 'unauthorized user' do
+      it 'should not return a project pipeline' do
+        post api("/projects/#{project.id}/pipelines/#{pipeline.id}/retry", non_member)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq '404 Project Not Found'
+        expect(json_response['id']).to be nil
+      end
+    end
+  end
+
+  describe 'POST /projects/:id/pipelines/:pipeline_id/cancel' do
+    let!(:pipeline) do
+      create(:ci_empty_pipeline, project: project, sha: project.commit.id,
+                                 ref: project.default_branch)
+    end
+
+    let!(:build) { create(:ci_build, :running, pipeline: pipeline) }
+
+    context 'authorized user' do
+      it 'retries failed builds' do
+        post api("/projects/#{project.id}/pipelines/#{pipeline.id}/cancel", user)
+
+        expect(response).to have_http_status(200)
+        expect(json_response['status']).to eq('canceled')
+      end
+    end
+
+    context 'user without proper access rights' do
+      let!(:reporter) { create(:user) }
+
+      before { project.team << [reporter, :reporter] }
+
+      it 'rejects the action' do
+        post api("/projects/#{project.id}/pipelines/#{pipeline.id}/cancel", reporter)
+
+        expect(response).to have_http_status(403)
+        expect(pipeline.reload.status).to eq('pending')
+      end
+    end
+  end
+end