app/models/wiki.rb


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# Redmine - project management software
# Copyright (C) 2006-2009  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

class Wiki < ActiveRecord::Base
  belongs_to :project
  has_many :pages, :class_name => 'WikiPage', :dependent => :destroy, :order => 'title'
  has_many :redirects, :class_name => 'WikiRedirect', :dependent => :delete_all
  
  acts_as_watchable
  
  validates_presence_of :start_page
  validates_format_of :start_page, :with => /^[^,\.\/\?\;\|\:]*$/
  
  def visible?(user=User.current)
    !user.nil? && user.allowed_to?(:view_wiki_pages, project)
  end
  
  # find the page with the given title
  # if page doesn't exist, return a new page
  def find_or_new_page(title)
    title = start_page if title.blank?
    find_page(title) || WikiPage.new(:wiki => self, :title => Wiki.titleize(title))
  end
  
  # find the page with the given title
  def find_page(title, options = {})
    title = start_page if title.blank?
    title = Wiki.titleize(title)
    page = pages.find_by_title(title)
    if !page && !(options[:with_redirect] == false)
      # search for a redirect
      redirect = redirects.find_by_title(title)
      page = find_page(redirect.redirects_to, :with_redirect => false) if redirect
    end
    page
  end
  
  # Finds a page by title
  # The given string can be of one of the forms: "title" or "project:title"
  # Examples:
  #   Wiki.find_page("bar", project => foo)
  #   Wiki.find_page("foo:bar")
  def self.find_page(title, options = {})
    project = options[:project]
    if title.to_s =~ %r{^([^\:]+)\:(.*)$}
      project_identifier, title = $1, $2
      project = Project.find_by_identifier(project_identifier) || Project.find_by_name(project_identifier)
    end
    if project && project.wiki
      page = project.wiki.find_page(title)
      if page && page.content
        page
      end
    end
  end
  
  # turn a string into a valid page title
  def self.titleize(title)
    # replace spaces with _ and remove unwanted caracters
    title = title.gsub(/\s+/, '_').delete(',./?;|:') if title
    # upcase the first letter
    title = (title.slice(0..0).upcase + (title.slice(1..-1) || '')) if title
    title
  end  
end

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<?php
/**
 * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-only
 */
namespace OCA\Files_Versions;

use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IConfig;
use Psr\Log\LoggerInterface;

class Expiration {

	// how long do we keep files a version if no other value is defined in the config file (unit: days)
	public const NO_OBLIGATION = -1;

	/** @var string */
	private $retentionObligation;

	/** @var int */
	private $minAge;

	/** @var int */
	private $maxAge;

	/** @var bool */
	private $canPurgeToSaveSpace;

	public function __construct(
		IConfig $config,
		private ITimeFactory $timeFactory,
		private LoggerInterface $logger,
	) {
		$this->retentionObligation = $config->getSystemValue('versions_retention_obligation', 'auto');

		if ($this->retentionObligation !== 'disabled') {
			$this->parseRetentionObligation();
		}
	}

	/**
	 * Is versions expiration enabled
	 * @return bool
	 */
	public function isEnabled(): bool {
		return $this->retentionObligation !== 'disabled';
	}

	/**
	 * Is default expiration active
	 */
	public function shouldAutoExpire(): bool {
		return $this->minAge === self::NO_OBLIGATION
				|| $this->maxAge === self::NO_OBLIGATION;
	}

	/**
	 * Check if given timestamp in expiration range
	 * @param int $timestamp
	 * @param bool $quotaExceeded
	 * @return bool
	 */
	public function isExpired(int $timestamp, bool $quotaExceeded = false): bool {
		// No expiration if disabled
		if (!$this->isEnabled()) {
			return false;
		}

		// Purge to save space (if allowed)
		if ($quotaExceeded && $this->canPurgeToSaveSpace) {
			return true;
		}

		$time = $this->timeFactory->getTime();
		// Never expire dates in future e.g. misconfiguration or negative time
		// adjustment
		if ($time < $timestamp) {
			return false;
		}

		// Purge as too old
		if ($this->maxAge !== self::NO_OBLIGATION) {
			$maxTimestamp = $time - ($this->maxAge * 86400);
			$isOlderThanMax = $timestamp < $maxTimestamp;
		} else {
			$isOlderThanMax = false;
		}

		if ($this->minAge !== self::NO_OBLIGATION) {
			// older than Min obligation and we are running out of quota?
			$minTimestamp = $time - ($this->minAge * 86400);
			$isMinReached = ($timestamp < $minTimestamp) && $quotaExceeded;
		} else {
			$isMinReached = false;
		}

		return $isOlderThanMax || $isMinReached;
	}

	/**
	 * Get maximal retention obligation as a timestamp
	 *
	 * @return int|false
	 */
	public function getMaxAgeAsTimestamp() {
		$maxAge = false;
		if ($this->isEnabled() && $this->maxAge !== self::NO_OBLIGATION) {
			$time = $this->timeFactory->getTime();
			$maxAge = $time - ($this->maxAge * 86400);
		}
		return $maxAge;
	}

	/**
	 * Read versions_retention_obligation, validate it
	 * and set private members accordingly
	 */
	private function parseRetentionObligation(): void {
		$splitValues = explode(',', $this->retentionObligation);
		if (!isset($splitValues[0])) {
			$minValue = 'auto';
		} else {
			$minValue = trim($splitValues[0]);
		}

		if (!isset($splitValues[1])) {
			$maxValue = 'auto';
		} else {
			$maxValue = trim($splitValues[1]);
		}

		$isValid = true;
		// Validate
		if (!ctype_digit($minValue) && $minValue !== 'auto') {
			$isValid = false;
			$this->logger->warning(
				$minValue . ' is not a valid value for minimal versions retention obligation. Check versions_retention_obligation in your config.php. Falling back to auto.',
				['app' => 'files_versions']
			);
		}

		if (!ctype_digit($maxValue) && $maxValue !== 'auto') {
			$isValid = false;
			$this->logger->warning(
				$maxValue . ' is not a valid value for maximal versions retention obligation. Check versions_retention_obligation in your config.php. Falling back to auto.',
				['app' => 'files_versions']
			);
		}

		if (!$isValid) {
			$minValue = 'auto';
			$maxValue = 'auto';
		}


		if ($minValue === 'auto' && $maxValue === 'auto') {
			// Default: Delete anytime if space needed
			$this->minAge = self::NO_OBLIGATION;
			$this->maxAge = self::NO_OBLIGATION;
			$this->canPurgeToSaveSpace = true;
		} elseif ($minValue !== 'auto' && $maxValue === 'auto') {
			// Keep for X days but delete anytime if space needed
			$this->minAge = (int)$minValue;
			$this->maxAge = self::NO_OBLIGATION;
			$this->canPurgeToSaveSpace = true;
		} elseif ($minValue === 'auto' && $maxValue !== 'auto') {
			// Delete anytime if space needed, Delete all older than max automatically
			$this->minAge = self::NO_OBLIGATION;
			$this->maxAge = (int)$maxValue;
			$this->canPurgeToSaveSpace = true;
		} elseif ($minValue !== 'auto' && $maxValue !== 'auto') {
			// Delete all older than max OR older than min if space needed

			// Max < Min as per https://github.com/owncloud/core/issues/16301
			if ($maxValue < $minValue) {
				$maxValue = $minValue;
			}

			$this->minAge = (int)$minValue;
			$this->maxAge = (int)$maxValue;
			$this->canPurgeToSaveSpace = false;
		}
	}
}