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require "grit"

class Project < ActiveRecord::Base
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  PROJECT_N = 0
  PROJECT_R = 1
  PROJECT_RW = 2
  PROJECT_RWA = 3

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  belongs_to :owner, :class_name => "User"

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  has_many :merge_requests, :dependent => :destroy
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  has_many :issues, :dependent => :destroy, :order => "position"
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  has_many :users_projects, :dependent => :destroy
  has_many :users, :through => :users_projects
  has_many :notes, :dependent => :destroy
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  has_many :snippets, :dependent => :destroy
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  has_many :deploy_keys, :dependent => :destroy, :foreign_key => "project_id", :class_name => "Key"
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  has_many :web_hooks, :dependent => :destroy
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  acts_as_taggable

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  validates :name,
            :uniqueness => true,
            :presence => true,
            :length   => { :within => 0..255 }

  validates :path,
            :uniqueness => true,
            :presence => true,
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            :format => { :with => /^[a-zA-Z0-9_\-\.]*$/,
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                         :message => "only letters, digits & '_' '-' '.' allowed" },
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            :length   => { :within => 0..255 }
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  validates :description,
            :length   => { :within => 0..2000 }

  validates :code,
            :presence => true,
            :uniqueness => true,
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            :format => { :with => /^[a-zA-Z0-9_\-\.]*$/,
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                         :message => "only letters, digits & '_' '-' '.' allowed"  },
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            :length   => { :within => 3..255 }
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  validates :owner,
            :presence => true

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  validate :check_limit
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  validate :repo_name

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  after_destroy :destroy_repository
  after_save :update_repository
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  attr_protected :private_flag, :owner_id
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  scope :public_only, where(:private_flag => false)

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  def self.active
    joins(:issues, :notes, :merge_requests).order("issues.created_at, notes.created_at, merge_requests.created_at DESC")
  end
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  def self.access_options
    {
      "Denied" => PROJECT_N,
      "Read"   => PROJECT_R,
      "Report" => PROJECT_RW,
      "Admin"  => PROJECT_RWA
    }
  end

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  def repository
    @repository ||= Repository.new(self)
  end

  delegate :repo,
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    :url_to_repo,
    :path_to_repo,
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    :update_repository,
    :destroy_repository,
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    :tags,
    :repo_exists?,
    :commit,
    :commits,
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    :commits_with_refs,
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    :tree,
    :heads,
    :commits_since,
    :fresh_commits,
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    :commits_between,
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    :to => :repository, :prefix => nil

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  def to_param
    code
  end

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  def web_url
    [GIT_HOST['host'], code].join("/")
  end

  def execute_web_hooks(oldrev, newrev, ref)
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    ref_parts = ref.split('/')

    # Return if this is not a push to a branch (e.g. new commits)
    return if ref_parts[1] !~ /heads/ || oldrev == "00000000000000000000000000000000"

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    data = web_hook_data(oldrev, newrev, ref)
    web_hooks.each { |web_hook| web_hook.execute(data) }
  end

  def web_hook_data(oldrev, newrev, ref)
    data = {
      before: oldrev,
      after: newrev,
      ref: ref,
      repository: {
        name: name,
        url: web_url,
        description: description,
        homepage: web_url,
        private: private?
      },
      commits: []
    }

    commits_between(oldrev, newrev).each do |commit|
      data[:commits] << {
        id: commit.id,
        message: commit.safe_message,
        timestamp: commit.date.xmlschema,
        url: "http://#{GIT_HOST['host']}/#{code}/commits/#{commit.id}",
        author: {
          name: commit.author_name,
          email: commit.author_email
        }
      }
    end

    data
  end

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  def team_member_by_name_or_email(email = nil, name = nil)
    user = users.where("email like ? or name like ?", email, name).first
    users_projects.find_by_user_id(user.id) if user
  end

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  def team_member_by_id(user_id)
    users_projects.find_by_user_id(user_id)
  end

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  def fresh_merge_requests(n)
    merge_requests.includes(:project, :author).order("created_at desc").first(n)
  end

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  def fresh_issues(n)
    issues.includes(:project, :author).order("created_at desc").first(n)
  end

  def fresh_notes(n)
    notes.inc_author_project.order("created_at desc").first(n)
  end

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  def common_notes
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    notes.where(:noteable_type => ["", nil]).inc_author_project
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  end

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  def build_commit_note(commit)
    notes.new(:noteable_id => commit.id, :noteable_type => "Commit")
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  end
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  def commit_notes(commit)
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    notes.where(:noteable_id => commit.id, :noteable_type => "Commit", :line_code => nil)
  end

  def commit_line_notes(commit)
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    notes.where(:noteable_id => commit.id, :noteable_type => "Commit").where("line_code is not null")
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  end
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  def has_commits?
    !!commit
  end

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  # Compatible with all access rights
  # Should be rewrited for new access rights
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  def add_access(user, *access)
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    access = if access.include?(:admin) 
               { :project_access => PROJECT_RWA } 
             elsif access.include?(:write)
               { :project_access => PROJECT_RW } 
             else
               { :project_access => PROJECT_R } 
             end
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    opts = { :user => user }
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    opts.merge!(access)
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    users_projects.create(opts)
  end

  def reset_access(user)
    users_projects.where(:project_id => self.id, :user_id => user.id).destroy if self.id
  end

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  def repository_readers
    keys = Key.joins({:user => :users_projects}).
      where("users_projects.project_id = ? AND users_projects.repo_access = ?", id, Repository::REPO_R)
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    keys.map(&:identifier) + deploy_keys.map(&:identifier)
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  end

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  def repository_writers
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    keys = Key.joins({:user => :users_projects}).
      where("users_projects.project_id = ? AND users_projects.repo_access = ?", id, Repository::REPO_RW)
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    keys.map(&:identifier)
  end

  def readers
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    @readers ||= users_projects.includes(:user).where(:project_access => [PROJECT_R, PROJECT_RW, PROJECT_RWA]).map(&:user)
  end

  def writers
    @writers ||= users_projects.includes(:user).where(:project_access => [PROJECT_RW, PROJECT_RWA]).map(&:user)
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  end

  def admins
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    @admins ||= users_projects.includes(:user).where(:project_access => PROJECT_RWA).map(&:user)
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  end

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  def allow_read_for?(user)
    !users_projects.where(:user_id => user.id, :project_access => [PROJECT_R, PROJECT_RW, PROJECT_RWA]).empty?
  end

  def allow_write_for?(user)
    !users_projects.where(:user_id => user.id, :project_access => [PROJECT_RW, PROJECT_RWA]).empty?
  end

  def allow_admin_for?(user)
    !users_projects.where(:user_id => user.id, :project_access => [PROJECT_RWA]).empty? || owner_id == user.id
  end

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  def allow_pull_for?(user)
    !users_projects.where(:user_id => user.id, :repo_access => [Repository::REPO_R, Repository::REPO_RW]).empty?
  end

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  def root_ref 
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    default_branch || "master"
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  end

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  def public?
    !private_flag
  end

  def private?
    private_flag
  end

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  def last_activity
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    updates(1).first
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  rescue
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    nil
  end

  def last_activity_date
    last_activity.try(:created_at)
  end

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  def last_activity_date_cached(expire = 1.hour)
    activity_date_key = "project_#{id}_activity_date"

    cached_activities = Rails.cache.read(activity_date_key)
    if cached_activities
      activity_date = if cached_activities == "Never"
                        nil
                      else
                        cached_activities
                      end
    else
      activity_date = last_activity_date
      Rails.cache.write(activity_date_key, activity_date || "Never", :expires_in => expire)
    end

    activity_date
  end

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  # Get project updates from cache
  # or calculate. 
  def cached_updates(limit, expire = 2.minutes)
    activities_key = "project_#{id}_activities"
    cached_activities = Rails.cache.read(activities_key)
    if cached_activities
      activities = cached_activities
    else
      activities = updates(limit)
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      Rails.cache.write(activities_key, activities, :expires_in => expire)
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    end

    activities
  end

  # Get 20 events for project like
  # commits, issues or notes
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  def updates(n = 3)
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    [
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      fresh_commits(n),
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      fresh_issues(n),
      fresh_notes(n)
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    ].compact.flatten.sort do |x, y|
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      y.created_at <=> x.created_at
    end[0...n]
  end

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  def activities(n=3)
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    [
      fresh_issues(n),
      fresh_merge_requests(n),
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      notes.inc_author_project.where("noteable_type is not null").order("created_at desc").first(n)
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    ].compact.flatten.sort do |x, y|
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      y.created_at <=> x.created_at
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    end[0...n]
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  end

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  def check_limit
    unless owner.can_create_project?
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      errors[:base] << ("Your own projects limit is #{owner.projects_limit}! Please contact administrator to increase it")
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    end
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  rescue
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    errors[:base] << ("Cant check your ability to create project")
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  end

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  def repo_name
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    if path == "gitolite-admin"
      errors.add(:path, " like 'gitolite-admin' is not allowed")
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    end
  end

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  def valid_repo?
    repo
  rescue
    errors.add(:path, "Invalid repository path")
    false
  end
end
# == Schema Information
#
# Table name: projects
#
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#  id             :integer         not null, primary key
#  name           :string(255)
#  path           :string(255)
#  description    :text
#  created_at     :datetime
#  updated_at     :datetime
#  private_flag   :boolean         default(TRUE), not null
#  code           :string(255)
#  owner_id       :integer
#  default_branch :string(255)     default("master"), not null
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#