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path: root/app/models/event.rb
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class Event < ActiveRecord::Base
  include Sortable
  default_scope { reorder(nil).where.not(author_id: nil) }

  CREATED   = 1
  UPDATED   = 2
  CLOSED    = 3
  REOPENED  = 4
  PUSHED    = 5
  COMMENTED = 6
  MERGED    = 7
  JOINED    = 8 # User joined project
  LEFT      = 9 # User left project
  DESTROYED = 10
  EXPIRED   = 11 # User left project due to expiry

  ACTIONS = HashWithIndifferentAccess.new(
    created:    CREATED,
    updated:    UPDATED,
    closed:     CLOSED,
    reopened:   REOPENED,
    pushed:     PUSHED,
    commented:  COMMENTED,
    merged:     MERGED,
    joined:     JOINED,
    left:       LEFT,
    destroyed:  DESTROYED,
    expired:    EXPIRED
  ).freeze

  TARGET_TYPES = HashWithIndifferentAccess.new(
    issue:          Issue,
    milestone:      Milestone,
    merge_request:  MergeRequest,
    note:           Note,
    project:        Project,
    snippet:        Snippet,
    user:           User
  ).freeze

  RESET_PROJECT_ACTIVITY_INTERVAL = 1.hour

  delegate :name, :email, :public_email, :username, to: :author, prefix: true, allow_nil: true
  delegate :title, to: :issue, prefix: true, allow_nil: true
  delegate :title, to: :merge_request, prefix: true, allow_nil: true
  delegate :title, to: :note, prefix: true, allow_nil: true

  belongs_to :author, class_name: "User"
  belongs_to :project
  belongs_to :target, polymorphic: true

  # For Hash only
  serialize :data # rubocop:disable Cop/ActiverecordSerialize

  # Callbacks
  after_create :reset_project_activity
  after_create :set_last_repository_updated_at, if: :push?

  # Scopes
  scope :recent, -> { reorder(id: :desc) }
  scope :code_push, -> { where(action: PUSHED) }

  scope :in_projects, ->(projects) do
    where(project_id: projects.pluck(:id)).recent
  end

  scope :with_associations, -> { includes(:author, :project, project: :namespace).preload(:target) }
  scope :for_milestone_id, ->(milestone_id) { where(target_type: "Milestone", target_id: milestone_id) }

  class << self
    # Update Gitlab::ContributionsCalendar#activity_dates if this changes
    def contributions
      where("action = ? OR (target_type IN (?) AND action IN (?)) OR (target_type = ? AND action = ?)",
            Event::PUSHED,
            %w(MergeRequest Issue), [Event::CREATED, Event::CLOSED, Event::MERGED],
            "Note", Event::COMMENTED)
    end

    def limit_recent(limit = 20, offset = nil)
      recent.limit(limit).offset(offset)
    end

    def actions
      ACTIONS.keys
    end

    def target_types
      TARGET_TYPES.keys
    end
  end

  def visible_to_user?(user = nil)
    if push? || commit_note?
      Ability.allowed?(user, :download_code, project)
    elsif membership_changed?
      true
    elsif created_project?
      true
    elsif issue? || issue_note?
      Ability.allowed?(user, :read_issue, note? ? note_target : target)
    elsif merge_request? || merge_request_note?
      Ability.allowed?(user, :read_merge_request, note? ? note_target : target)
    else
      milestone?
    end
  end

  def project_name
    if project
      project.name_with_namespace
    else
      "(deleted project)"
    end
  end

  def target_title
    target.try(:title)
  end

  def created?
    action == CREATED
  end

  def push?
    action == PUSHED && valid_push?
  end

  def merged?
    action == MERGED
  end

  def closed?
    action == CLOSED
  end

  def reopened?
    action == REOPENED
  end

  def joined?
    action == JOINED
  end

  def left?
    action == LEFT
  end

  def expired?
    action == EXPIRED
  end

  def destroyed?
    action == DESTROYED
  end

  def commented?
    action == COMMENTED
  end

  def membership_changed?
    joined? || left? || expired?
  end

  def created_project?
    created? && !target && target_type.nil?
  end

  def created_target?
    created? && target
  end

  def milestone?
    target_type == "Milestone"
  end

  def note?
    target.is_a?(Note)
  end

  def issue?
    target_type == "Issue"
  end

  def merge_request?
    target_type == "MergeRequest"
  end

  def milestone
    target if milestone?
  end

  def issue
    target if issue?
  end

  def merge_request
    target if merge_request?
  end

  def note
    target if note?
  end

  def action_name
    if push?
      if new_ref?
        "pushed new"
      elsif rm_ref?
        "deleted"
      else
        "pushed to"
      end
    elsif closed?
      "closed"
    elsif merged?
      "accepted"
    elsif joined?
      'joined'
    elsif left?
      'left'
    elsif expired?
      'removed due to membership expiration from'
    elsif destroyed?
      'destroyed'
    elsif commented?
      "commented on"
    elsif created_project?
      if project.external_import?
        "imported"
      else
        "created"
      end
    else
      "opened"
    end
  end

  def valid_push?
    data[:ref] && ref_name.present?
  rescue
    false
  end

  def tag?
    Gitlab::Git.tag_ref?(data[:ref])
  end

  def branch?
    Gitlab::Git.branch_ref?(data[:ref])
  end

  def new_ref?
    Gitlab::Git.blank_ref?(commit_from)
  end

  def rm_ref?
    Gitlab::Git.blank_ref?(commit_to)
  end

  def md_ref?
    !(rm_ref? || new_ref?)
  end

  def commit_from
    data[:before]
  end

  def commit_to
    data[:after]
  end

  def ref_name
    if tag?
      tag_name
    else
      branch_name
    end
  end

  def branch_name
    @branch_name ||= Gitlab::Git.ref_name(data[:ref])
  end

  def tag_name
    @tag_name ||= Gitlab::Git.ref_name(data[:ref])
  end

  # Max 20 commits from push DESC
  def commits
    @commits ||= (data[:commits] || []).reverse
  end

  def commits_count
    data[:total_commits_count] || commits.count || 0
  end

  def ref_type
    tag? ? "tag" : "branch"
  end

  def push_with_commits?
    !commits.empty? && commit_from && commit_to
  end

  def last_push_to_non_root?
    branch? && project.default_branch != branch_name
  end

  def target_iid
    target.respond_to?(:iid) ? target.iid : target_id
  end

  def commit_note?
    note? && target && target.for_commit?
  end

  def issue_note?
    note? && target && target.for_issue?
  end

  def merge_request_note?
    note? && target && target.for_merge_request?
  end

  def project_snippet_note?
    note? && target && target.for_snippet?
  end

  def note_target
    target.noteable
  end

  def note_target_id
    if commit_note?
      target.commit_id
    else
      target.noteable_id.to_s
    end
  end

  def note_target_reference
    return unless note_target

    # Commit#to_reference returns the full SHA, but we want the short one here
    if commit_note?
      note_target.short_id
    else
      note_target.to_reference
    end
  end

  def note_target_type
    if target.noteable_type.present?
      target.noteable_type.titleize
    else
      "Wall"
    end.downcase
  end

  def body?
    if push?
      push_with_commits? || rm_ref?
    elsif note?
      true
    else
      target.respond_to? :title
    end
  end

  def reset_project_activity
    return unless project

    # Don't bother updating if we know the project was updated recently.
    return if recent_update?

    # At this point it's possible for multiple threads/processes to try to
    # update the project. Only one query should actually perform the update,
    # hence we add the extra WHERE clause for last_activity_at.
    Project.unscoped.where(id: project_id).
      where('last_activity_at <= ?', RESET_PROJECT_ACTIVITY_INTERVAL.ago).
      update_all(last_activity_at: created_at)
  end

  def authored_by?(user)
    user ? author_id == user.id : false
  end

  private

  def recent_update?
    project.last_activity_at > RESET_PROJECT_ACTIVITY_INTERVAL.ago
  end

  def set_last_repository_updated_at
    Project.unscoped.where(id: project_id).
      update_all(last_repository_updated_at: created_at)
  end
end