Add slash command for moving an issue

Carried over from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8857

8 files changed, 254 insertions, 1 deletions

diff --git a/changelogs/unreleased/adamco-gitlab-ce-move-issue-command.yml b/changelogs/unreleased/adamco-gitlab-ce-move-issue-command.yml
new file mode 100644
index 00000000000..3b057373e7d
--- /dev/null
+++ b/changelogs/unreleased/adamco-gitlab-ce-move-issue-command.yml
@@ -0,0 +1,5 @@
+---
+title: Add slash command for moving issues
+merge_request:
+author: Adam Pahlevi
+type: added
diff --git a/doc/integration/slash_commands.md b/doc/integration/slash_commands.md
index 36a8844e953..7d73026a6c6 100644
--- a/doc/integration/slash_commands.md
+++ b/doc/integration/slash_commands.md
@@ -15,9 +15,10 @@ Taking the trigger term as `project-name`, the commands are:
 | `/project-name issue new <title> <shift+return> <description>` | Creates a new issue with title `<title>` and description `<description>` |
 | `/project-name issue show <id>` | Shows the issue with id `<id>` |
 | `/project-name issue search <query>` | Shows up to 5 issues matching `<query>` |
+| `/project-name issue move <id> to <project>` | Moves issue ID `<id>` to `<project>` |
 | `/project-name deploy <from> to <to>` | Deploy from the `<from>` environment to the `<to>` environment |
 
-Note that if you are using the [GitLab Slack application](https://docs.gitlab.com/ee/user/project/integrations/gitlab_slack_application.html) for 
+Note that if you are using the [GitLab Slack application](https://docs.gitlab.com/ee/user/project/integrations/gitlab_slack_application.html) for
 your GitLab.com projects, you need to [add the `gitlab` keyword at the beginning of the command](https://docs.gitlab.com/ee/user/project/integrations/gitlab_slack_application.html#usage).
 
 ## Issue commands
diff --git a/lib/gitlab/slash_commands/command.rb b/lib/gitlab/slash_commands/command.rb
index 85aaa6b0eba..bb778f37096 100644
--- a/lib/gitlab/slash_commands/command.rb
+++ b/lib/gitlab/slash_commands/command.rb
@@ -5,6 +5,7 @@ module Gitlab
         Gitlab::SlashCommands::IssueShow,
         Gitlab::SlashCommands::IssueNew,
         Gitlab::SlashCommands::IssueSearch,
+        Gitlab::SlashCommands::IssueMove,
         Gitlab::SlashCommands::Deploy
       ].freeze
 
diff --git a/lib/gitlab/slash_commands/issue_move.rb b/lib/gitlab/slash_commands/issue_move.rb
new file mode 100644
index 00000000000..3985e635983
--- /dev/null
+++ b/lib/gitlab/slash_commands/issue_move.rb
@@ -0,0 +1,45 @@
+module Gitlab
+  module SlashCommands
+    class IssueMove < IssueCommand
+      def self.match(text)
+        %r{
+          \A                                 # the beginning of a string
+          issue\s+move\s+                    # the command
+          \#?(?<iid>\d+)\s+                  # the issue id, may preceded by hash sign
+          (to\s+)?                           # aid the command to be much more human-ly
+          (?<project_path>[^\s]+)            # named group for id of dest. project
+        }x.match(text)
+      end
+
+      def self.help_message
+        'issue move <issue_id> (to)? <project_path>'
+      end
+
+      def self.allowed?(project, user)
+        can?(user, :admin_issue, project)
+      end
+
+      def execute(match)
+        old_issue = find_by_iid(match[:iid])
+        target_project = Project.find_by_full_path(match[:project_path])
+
+        unless current_user.can?(:read_project, target_project) && old_issue
+          return Gitlab::SlashCommands::Presenters::Access.new.not_found
+        end
+
+        new_issue = Issues::MoveService.new(project, current_user)
+                      .execute(old_issue, target_project)
+
+        presenter(new_issue).present(old_issue)
+      rescue Issues::MoveService::MoveError => e
+        presenter(old_issue).display_move_error(e.message)
+      end
+
+      private
+
+      def presenter(issue)
+        Gitlab::SlashCommands::Presenters::IssueMove.new(issue)
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/slash_commands/presenters/issue_move.rb b/lib/gitlab/slash_commands/presenters/issue_move.rb
new file mode 100644
index 00000000000..03921729941
--- /dev/null
+++ b/lib/gitlab/slash_commands/presenters/issue_move.rb
@@ -0,0 +1,53 @@
+# coding: utf-8
+module Gitlab
+  module SlashCommands
+    module Presenters
+      class IssueMove < Presenters::Base
+        include Presenters::IssueBase
+
+        def present(old_issue)
+          in_channel_response(moved_issue(old_issue))
+        end
+
+        def display_move_error(error)
+          message = header_with_list("The action was not successful, because:", [error])
+
+          ephemeral_response(text: message)
+        end
+
+        private
+
+        def moved_issue(old_issue)
+          {
+            attachments: [
+              {
+                title:        "#{@resource.title} · #{@resource.to_reference}",
+                title_link:   resource_url,
+                author_name:  author.name,
+                author_icon:  author.avatar_url,
+                fallback:     "Issue #{@resource.to_reference}: #{@resource.title}",
+                pretext:      pretext(old_issue),
+                color:        color(@resource),
+                fields:       fields,
+                mrkdwn_in: [
+                  :title,
+                  :pretext,
+                  :text,
+                  :fields
+                ]
+              }
+            ]
+          }
+        end
+
+        def pretext(old_issue)
+          "Moved issue *#{issue_link(old_issue)}* to *#{issue_link(@resource)}*"
+        end
+
+        def issue_link(issue)
+          "[#{issue.to_reference}](#{project_issue_url(issue.project, issue)})"
+        end
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/slash_commands/command_spec.rb b/spec/lib/gitlab/slash_commands/command_spec.rb
index e3447d974aa..194cae8c645 100644
--- a/spec/lib/gitlab/slash_commands/command_spec.rb
+++ b/spec/lib/gitlab/slash_commands/command_spec.rb
@@ -108,5 +108,10 @@ describe Gitlab::SlashCommands::Command do
 
       it { is_expected.to eq(Gitlab::SlashCommands::IssueSearch) }
     end
+
+    context 'IssueMove is triggered' do
+      let(:params) { { text: 'issue move #78291 to gitlab/gitlab-ci' } }
+      it { is_expected.to eq(Gitlab::SlashCommands::IssueMove) }
+    end
   end
 end
diff --git a/spec/lib/gitlab/slash_commands/issue_move_spec.rb b/spec/lib/gitlab/slash_commands/issue_move_spec.rb
new file mode 100644
index 00000000000..d41441c9472
--- /dev/null
+++ b/spec/lib/gitlab/slash_commands/issue_move_spec.rb
@@ -0,0 +1,117 @@
+require 'spec_helper'
+
+describe Gitlab::SlashCommands::IssueMove, service: true do
+  describe '#match' do
+    shared_examples_for 'move command' do |text_command|
+      it 'can be parsed to extract the needed fields' do
+        match_data = described_class.match(text_command)
+
+        expect(match_data['iid']).to eq('123456')
+        expect(match_data['project_path']).to eq('gitlab/gitlab-ci')
+      end
+    end
+
+    it_behaves_like 'move command', 'issue move #123456 to gitlab/gitlab-ci'
+    it_behaves_like 'move command', 'issue move #123456 gitlab/gitlab-ci'
+    it_behaves_like 'move command', 'issue move #123456 gitlab/gitlab-ci '
+    it_behaves_like 'move command', 'issue move 123456 to gitlab/gitlab-ci'
+    it_behaves_like 'move command', 'issue move 123456 gitlab/gitlab-ci'
+    it_behaves_like 'move command', 'issue move 123456 gitlab/gitlab-ci '
+  end
+
+  describe '#execute' do
+    set(:user) { create(:user) }
+    set(:issue) { create(:issue) }
+    set(:chat_name) { create(:chat_name, user: user) }
+    set(:project) { issue.project }
+    set(:other_project) { create(:project, namespace: project.namespace) }
+
+    before do
+      [project, other_project].each { |prj| prj.add_master(user) }
+    end
+
+    subject { described_class.new(project, chat_name) }
+
+    def process_message(message)
+      subject.execute(described_class.match(message))
+    end
+
+    context 'when the user can move the issue' do
+      context 'when the move fails' do
+        it 'returns the error message' do
+          message = "issue move #{issue.iid} #{project.full_path}"
+
+          expect(process_message(message)).to include(response_type: :ephemeral,
+                                                      text: a_string_matching('Cannot move issue'))
+        end
+      end
+
+      context 'when the move succeeds' do
+        let(:message) { "issue move #{issue.iid} #{other_project.full_path}" }
+
+        it 'moves the issue to the new destination' do
+          expect { process_message(message) }.to change { Issue.count }.by(1)
+
+          new_issue = issue.reload.moved_to
+
+          expect(new_issue.state).to eq('opened')
+          expect(new_issue.project_id).to eq(other_project.id)
+          expect(new_issue.author_id).to eq(issue.author_id)
+
+          expect(issue.state).to eq('closed')
+          expect(issue.project_id).to eq(project.id)
+        end
+
+        it 'returns the new issue' do
+          expect(process_message(message))
+            .to include(response_type: :in_channel,
+                        attachments: [a_hash_including(title_link: a_string_including(other_project.full_path))])
+        end
+
+        it 'mentions the old issue' do
+          expect(process_message(message))
+            .to include(attachments: [a_hash_including(pretext: a_string_including(project.full_path))])
+        end
+      end
+    end
+
+    context 'when the issue does not exist' do
+      it 'returns not found' do
+        message = "issue move #{issue.iid.succ} #{other_project.full_path}"
+
+        expect(process_message(message)).to include(response_type: :ephemeral,
+                                                    text: a_string_matching('not found'))
+      end
+    end
+
+    context 'when the target project does not exist' do
+      it 'returns not found' do
+        message = "issue move #{issue.iid} #{other_project.full_path}/foo"
+
+        expect(process_message(message)).to include(response_type: :ephemeral,
+                                                    text: a_string_matching('not found'))
+      end
+    end
+
+    context 'when the user cannot see the target project' do
+      it 'returns not found' do
+        message = "issue move #{issue.iid} #{other_project.full_path}"
+        other_project.team.truncate
+
+        expect(process_message(message)).to include(response_type: :ephemeral,
+                                                    text: a_string_matching('not found'))
+      end
+    end
+
+    context 'when the user does not have the required permissions on the target project' do
+      it 'returns the error message' do
+        message = "issue move #{issue.iid} #{other_project.full_path}"
+        other_project.team.truncate
+        other_project.team.add_guest(user)
+
+        expect(process_message(message)).to include(response_type: :ephemeral,
+                                                    text: a_string_matching('Cannot move issue'))
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/slash_commands/presenters/issue_move_spec.rb b/spec/lib/gitlab/slash_commands/presenters/issue_move_spec.rb
new file mode 100644
index 00000000000..58c341a284e
--- /dev/null
+++ b/spec/lib/gitlab/slash_commands/presenters/issue_move_spec.rb
@@ -0,0 +1,26 @@
+require 'spec_helper'
+
+describe Gitlab::SlashCommands::Presenters::IssueMove do
+  set(:admin) { create(:admin) }
+  set(:project) { create(:project) }
+  set(:other_project) { create(:project) }
+  set(:old_issue) { create(:issue, project: project) }
+  set(:new_issue) { Issues::MoveService.new(project, admin).execute(old_issue, other_project) }
+  let(:attachment) { subject[:attachments].first }
+
+  subject { described_class.new(new_issue).present(old_issue) }
+
+  it { is_expected.to be_a(Hash) }
+
+  it 'shows the new issue' do
+    expect(subject[:response_type]).to be(:in_channel)
+    expect(subject).to have_key(:attachments)
+    expect(attachment[:title]).to start_with(new_issue.title)
+    expect(attachment[:title_link]).to include(other_project.full_path)
+  end
+
+  it 'mentions the old issue and the new issue in the pretext' do
+    expect(attachment[:pretext]).to include(project.full_path)
+    expect(attachment[:pretext]).to include(other_project.full_path)
+  end
+end