Merge branch 'ce-57402-add-issues-statistics-api-endpoints' into 'master'

Add issues_statistics api endpoints

See merge request gitlab-org/gitlab-ce!27366

4 files changed, 147 insertions, 38 deletions

diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 296688ba25b..625fada4f08 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -542,10 +542,15 @@ module API
     class IssueBasic < ProjectEntity
       expose :closed_at
       expose :closed_by, using: Entities::UserBasic
-      expose :labels do |issue|
-        # Avoids an N+1 query since labels are preloaded
-        issue.labels.map(&:title).sort
+
+      expose :labels do |issue, options|
+        if options[:with_labels_details]
+          ::API::Entities::LabelBasic.represent(issue.labels.sort_by(&:title))
+        else
+          issue.labels.map(&:title).sort
+        end
       end
+
       expose :milestone, using: Entities::Milestone
       expose :assignees, :author, using: Entities::UserBasic
 
@@ -573,6 +578,14 @@ module API
     class Issue < IssueBasic
       include ::API::Helpers::RelatedResourcesHelpers
 
+      expose(:has_tasks) do |issue, _|
+        !issue.task_list_items.empty?
+      end
+
+      expose :task_status, if: -> (issue, _) do
+        !issue.task_list_items.empty?
+      end
+
       expose :_links do
         expose :self do |issue|
           expose_url(api_v4_project_issue_path(id: issue.project_id, issue_iid: issue.iid))
diff --git a/lib/api/helpers/issues_helpers.rb b/lib/api/helpers/issues_helpers.rb
index f6762910b0c..fc66cec5341 100644
--- a/lib/api/helpers/issues_helpers.rb
+++ b/lib/api/helpers/issues_helpers.rb
@@ -18,6 +18,39 @@ module API
           :title
         ]
       end
+
+      def issue_finder(args = {})
+        args = declared_params.merge(args)
+
+        args.delete(:id)
+        args[:milestone_title] ||= args.delete(:milestone)
+        args[:label_name] ||= args.delete(:labels)
+        args[:scope] = args[:scope].underscore if args[:scope]
+
+        IssuesFinder.new(current_user, args)
+      end
+
+      def find_issues(args = {})
+        finder = issue_finder(args)
+        issues = finder.execute.with_api_entity_associations
+
+        issues.reorder(order_options_with_tie_breaker) # rubocop: disable CodeReuse/ActiveRecord
+      end
+
+      def issues_statistics(args = {})
+        finder = issue_finder(args)
+        counter = Gitlab::IssuablesCountForState.new(finder)
+
+        {
+          statistics: {
+            counts: {
+              all: counter[:all],
+              closed: counter[:closed],
+              opened: counter[:opened]
+            }
+          }
+        }
+      end
     end
   end
 end
diff --git a/lib/api/issues.rb b/lib/api/issues.rb
index d0a93b77951..0b4da01f3c8 100644
--- a/lib/api/issues.rb
+++ b/lib/api/issues.rb
@@ -3,27 +3,12 @@
 module API
   class Issues < Grape::API
     include PaginationParams
+    helpers Helpers::IssuesHelpers
+    helpers ::Gitlab::IssuableMetadata
 
     before { authenticate_non_get! }
 
-    helpers ::Gitlab::IssuableMetadata
-
     helpers do
-      # rubocop: disable CodeReuse/ActiveRecord
-      def find_issues(args = {})
-        args = declared_params.merge(args)
-
-        args.delete(:id)
-        args[:milestone_title] = args.delete(:milestone)
-        args[:label_name] = args.delete(:labels)
-        args[:scope] = args[:scope].underscore if args[:scope]
-
-        issues = IssuesFinder.new(current_user, args).execute
-                   .with_api_entity_associations
-        issues.reorder(order_options_with_tie_breaker)
-      end
-      # rubocop: enable CodeReuse/ActiveRecord
-
       if Gitlab.ee?
         params :issues_params_ee do
           optional :weight, types: [Integer, String], integer_none_any: true, desc: 'The weight of the issue'
@@ -34,13 +19,9 @@ module API
         end
       end
 
-      params :issues_params do
+      params :issues_stats_params do
         optional :labels, type: Array[String], coerce_with: Validations::Types::LabelsList.coerce, desc: 'Comma-separated list of label names'
         optional :milestone, type: String, desc: 'Milestone title'
-        optional :order_by, type: String, values: %w[created_at updated_at], default: 'created_at',
-                            desc: 'Return issues ordered by `created_at` or `updated_at` fields.'
-        optional :sort, type: String, values: %w[asc desc], default: 'desc',
-                        desc: 'Return issues sorted in `asc` or `desc` order.'
         optional :milestone, type: String, desc: 'Return issues for a specific milestone'
         optional :iids, type: Array[Integer], desc: 'The IID array of issues'
         optional :search, type: String, desc: 'Search issues for text present in the title, description, or any combination of these'
@@ -49,18 +30,39 @@ module API
         optional :created_before, type: DateTime, desc: 'Return issues created before the specified time'
         optional :updated_after, type: DateTime, desc: 'Return issues updated after the specified time'
         optional :updated_before, type: DateTime, desc: 'Return issues updated before the specified time'
+
         optional :author_id, type: Integer, desc: 'Return issues which are authored by the user with the given ID'
+        optional :author_username, type: String, desc: 'Return issues which are authored by the user with the given username'
+        mutually_exclusive :author_id, :author_username
+
         optional :assignee_id, types: [Integer, String], integer_none_any: true,
                                desc: 'Return issues which are assigned to the user with the given ID'
+        optional :assignee_username, type: Array[String], check_assignees_count: true,
+                                     coerce_with: Validations::CheckAssigneesCount.coerce,
+                                     desc: 'Return issues which are assigned to the user with the given username'
+        mutually_exclusive :assignee_id, :assignee_username
+
         optional :scope, type: String, values: %w[created-by-me assigned-to-me created_by_me assigned_to_me all],
                          desc: 'Return issues for the given scope: `created_by_me`, `assigned_to_me` or `all`'
         optional :my_reaction_emoji, type: String, desc: 'Return issues reacted by the authenticated user by the given emoji'
         optional :confidential, type: Boolean, desc: 'Filter confidential or public issues'
-        use :pagination
 
         use :issues_params_ee if Gitlab.ee?
       end
 
+      params :issues_params do
+        optional :with_labels_details, type: Boolean, desc: 'Return more label data than just lable title', default: false
+        optional :state, type: String, values: %w[opened closed all], default: 'all',
+                 desc: 'Return opened, closed, or all issues'
+        optional :order_by, type: String, values: %w[created_at updated_at], default: 'created_at',
+                 desc: 'Return issues ordered by `created_at` or `updated_at` fields.'
+        optional :sort, type: String, values: %w[asc desc], default: 'desc',
+                 desc: 'Return issues sorted in `asc` or `desc` order.'
+
+        use :issues_stats_params
+        use :pagination
+      end
+
       params :issue_params do
         optional :description, type: String, desc: 'The description of an issue'
         optional :assignee_ids, type: Array[Integer], desc: 'The array of user IDs to assign issue'
@@ -75,13 +77,23 @@ module API
       end
     end
 
+    desc "Get currently authenticated user's issues statistics"
+    params do
+      use :issues_stats_params
+      optional :scope, type: String, values: %w[created_by_me assigned_to_me all], default: 'created_by_me',
+                       desc: 'Return issues for the given scope: `created_by_me`, `assigned_to_me` or `all`'
+    end
+    get '/issues_statistics' do
+      authenticate! unless params[:scope] == 'all'
+
+      present issues_statistics, with: Grape::Presenters::Presenter
+    end
+
     resource :issues do
       desc "Get currently authenticated user's issues" do
-        success Entities::IssueBasic
+        success Entities::Issue
       end
       params do
-        optional :state, type: String, values: %w[opened closed all], default: 'all',
-                         desc: 'Return opened, closed, or all issues'
         use :issues_params
         optional :scope, type: String, values: %w[created-by-me assigned-to-me created_by_me assigned_to_me all], default: 'created_by_me',
                          desc: 'Return issues for the given scope: `created_by_me`, `assigned_to_me` or `all`'
@@ -91,7 +103,8 @@ module API
         issues = paginate(find_issues)
 
         options = {
-          with: Entities::IssueBasic,
+          with: Entities::Issue,
+          with_labels_details: declared_params[:with_labels_details],
           current_user: current_user,
           issuable_metadata: issuable_meta_data(issues, 'Issue')
         }
@@ -105,11 +118,9 @@ module API
     end
     resource :groups, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
       desc 'Get a list of group issues' do
-        success Entities::IssueBasic
+        success Entities::Issue
       end
       params do
-        optional :state, type: String, values: %w[opened closed all], default: 'all',
-                         desc: 'Return opened, closed, or all issues'
         use :issues_params
       end
       get ":id/issues" do
@@ -118,13 +129,24 @@ module API
         issues = paginate(find_issues(group_id: group.id, include_subgroups: true))
 
         options = {
-          with: Entities::IssueBasic,
+          with: Entities::Issue,
+          with_labels_details: declared_params[:with_labels_details],
           current_user: current_user,
           issuable_metadata: issuable_meta_data(issues, 'Issue')
         }
 
         present issues, options
       end
+
+      desc 'Get statistics for the list of group issues'
+      params do
+        use :issues_stats_params
+      end
+      get ":id/issues_statistics" do
+        group = find_group!(params[:id])
+
+        present issues_statistics(group_id: group.id, include_subgroups: true), with: Grape::Presenters::Presenter
+      end
     end
 
     params do
@@ -134,11 +156,9 @@ module API
       include TimeTrackingEndpoints
 
       desc 'Get a list of project issues' do
-        success Entities::IssueBasic
+        success Entities::Issue
       end
       params do
-        optional :state, type: String, values: %w[opened closed all], default: 'all',
-                         desc: 'Return opened, closed, or all issues'
         use :issues_params
       end
       get ":id/issues" do
@@ -147,7 +167,8 @@ module API
         issues = paginate(find_issues(project_id: project.id))
 
         options = {
-          with: Entities::IssueBasic,
+          with: Entities::Issue,
+          with_labels_details: declared_params[:with_labels_details],
           current_user: current_user,
           project: user_project,
           issuable_metadata: issuable_meta_data(issues, 'Issue')
@@ -156,6 +177,16 @@ module API
         present issues, options
       end
 
+      desc 'Get statistics for the list of project issues'
+      params do
+        use :issues_stats_params
+      end
+      get ":id/issues_statistics" do
+        project = find_project!(params[:id])
+
+        present issues_statistics(project_id: project.id), with: Grape::Presenters::Presenter
+      end
+
       desc 'Get a single project issue' do
         success Entities::Issue
       end
diff --git a/lib/api/validations/check_assignees_count.rb b/lib/api/validations/check_assignees_count.rb
new file mode 100644
index 00000000000..836ec936b31
--- /dev/null
+++ b/lib/api/validations/check_assignees_count.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module API
+  module Validations
+    class CheckAssigneesCount < Grape::Validations::Base
+      def self.coerce
+        lambda do |value|
+          case value
+          when String, Array
+            Array.wrap(value)
+          else
+            []
+          end
+        end
+      end
+
+      def validate_param!(attr_name, params)
+        return if param_allowed?(attr_name, params)
+
+        raise Grape::Exceptions::Validation,
+              params: [@scope.full_name(attr_name)],
+              message: "allows one value, but found #{params[attr_name].size}: #{params[attr_name].join(", ")}"
+      end
+
+      private
+
+      def param_allowed?(attr_name, params)
+        params[attr_name].size <= 1
+      end
+    end
+  end
+end