Calculates the current update status of a specific project.

This function is the heart of the update status feature. For each project it is invoked with, it first checks if the project has been flagged with a special status like "unsupported" or "insecure", or if the project node itself has been unpublished. In any of those cases, the project is marked with an error and the next project is considered.

If the project itself is valid, the function decides what major release series to consider. The project defines what the currently supported major versions are for each version of core, so the first step is to make sure the current version is still supported. If so, that's the target version. If the current version is unsupported, the project maintainer's recommended major version is used. There's also a check to make sure that this function never recommends an earlier release than the currently installed major version.

Given a target major version, the available releases are scanned looking for the specific release to recommend (avoiding beta releases and development snapshots if possible). For the target major version, the highest patch level is found. If there is a release at that patch level with no extra ("beta", etc.), then the release at that patch level with the most recent release date is recommended. If every release at that patch level has extra (only betas), then the latest release from the previous patch level is recommended. For example:

• 1.6-bugfix <-- recommended version because 1.6 already exists.
• 1.6

or

• 1.6-beta
• 1.5 <-- recommended version because no 1.6 exists.
• 1.4

Also, the latest release from the same major version is looked for, even beta releases, to display to the user as the "Latest version" option. Additionally, the latest official release from any higher major versions that have been released is searched for to provide a set of "Also available" options.

Finally, and most importantly, the release history continues to be scanned until the currently installed release is reached, searching for anything marked as a security update. If any security updates have been found between the recommended release and the installed version, all of the releases that included a security fix are recorded so that the site administrator can be warned their site is insecure, and links pointing to the release notes for each security update can be included (which, in turn, will link to the official security announcements for each vulnerability).

This function relies on the fact that the .xml release history data comes sorted based on major version and patch level, then finally by release date if there are multiple releases such as betas from the same major.patch version (e.g., 5.x-1.5-beta1, 5.x-1.5-beta2, and 5.x-1.5). Development snapshots for a given major version are always listed last.

Parameters

$project: An array containing information about a specific project.

$project_data: An array containing information about a specific project.

$available: Data about available project releases of a specific project.

File

drupal-7.x/modules/update/update.compare.inc, line 427

Code required only when comparing available updates to existing data.

Code

function update_calculate_project_update_status($project, &$project_data, $available) {
  foreach (array('title', 'link') as $attribute) {
    if (!isset($project_data[$attribute]) && isset($available[$attribute])) {
      $project_data[$attribute] = $available[$attribute];
    }
  }

  // If the project status is marked as something bad, there's nothing else
  // to consider.
  if (isset($available['project_status'])) {
    switch ($available['project_status']) {
      case 'insecure':
        $project_data['status'] = UPDATE_NOT_SECURE;
        if (empty($project_data['extra'])) {
          $project_data['extra'] = array();
        }
        $project_data['extra'][] = array(
          'class' => array('project-not-secure'),
          'label' => t('Project not secure'),
          'data' => t('This project has been labeled insecure by the Drupal security team, and is no longer available for download. Immediately disabling everything included by this project is strongly recommended!'),
        );
        break;
      case 'unpublished':
      case 'revoked':
        $project_data['status'] = UPDATE_REVOKED;
        if (empty($project_data['extra'])) {
          $project_data['extra'] = array();
        }
        $project_data['extra'][] = array(
          'class' => array('project-revoked'),
          'label' => t('Project revoked'),
          'data' => t('This project has been revoked, and is no longer available for download. Disabling everything included by this project is strongly recommended!'),
        );
        break;
      case 'unsupported':
        $project_data['status'] = UPDATE_NOT_SUPPORTED;
        if (empty($project_data['extra'])) {
          $project_data['extra'] = array();
        }
        $project_data['extra'][] = array(
          'class' => array('project-not-supported'),
          'label' => t('Project not supported'),
          'data' => t('This project is no longer supported, and is no longer available for download. Disabling everything included by this project is strongly recommended!'),
        );
        break;
      case 'not-fetched':
        $project_data['status'] = UPDATE_NOT_FETCHED;
        $project_data['reason'] = t('Failed to get available update data.');
        break;

      default:
        // Assume anything else (e.g. 'published') is valid and we should
        // perform the rest of the logic in this function.
        break;
    }
  }

  if (!empty($project_data['status'])) {
    // We already know the status for this project, so there's nothing else to
    // compute. Record the project status into $project_data and we're done.
    $project_data['project_status'] = $available['project_status'];
    return;
  }

  // Figure out the target major version.
  $existing_major = $project_data['existing_major'];
  $supported_majors = array();
  if (isset($available['supported_majors'])) {
    $supported_majors = explode(',', $available['supported_majors']);
  }
  elseif (isset($available['default_major'])) {
    // Older release history XML file without supported or recommended.
    $supported_majors[] = $available['default_major'];
  }

  if (in_array($existing_major, $supported_majors)) {
    // Still supported, stay at the current major version.
    $target_major = $existing_major;
  }
  elseif (isset($available['recommended_major'])) {
    // Since 'recommended_major' is defined, we know this is the new XML
    // format. Therefore, we know the current release is unsupported since
    // its major version was not in the 'supported_majors' list. We should
    // find the best release from the recommended major version.
    $target_major = $available['recommended_major'];
    $project_data['status'] = UPDATE_NOT_SUPPORTED;
  }
  elseif (isset($available['default_major'])) {
    // Older release history XML file without recommended, so recommend
    // the currently defined "default_major" version.
    $target_major = $available['default_major'];
  }
  else {
    // Malformed XML file? Stick with the current version.
    $target_major = $existing_major;
  }

  // Make sure we never tell the admin to downgrade. If we recommended an
  // earlier version than the one they're running, they'd face an
  // impossible data migration problem, since Drupal never supports a DB
  // downgrade path. In the unfortunate case that what they're running is
  // unsupported, and there's nothing newer for them to upgrade to, we
  // can't print out a "Recommended version", but just have to tell them
  // what they have is unsupported and let them figure it out.
  $target_major = max($existing_major, $target_major);

  $release_patch_changed = '';
  $patch = '';

  // If the project is marked as UPDATE_FETCH_PENDING, it means that the
  // data we currently have (if any) is stale, and we've got a task queued
  // up to (re)fetch the data. In that case, we mark it as such, merge in
  // whatever data we have (e.g. project title and link), and move on.
  if (!empty($available['fetch_status']) && $available['fetch_status'] == UPDATE_FETCH_PENDING) {
    $project_data['status'] = UPDATE_FETCH_PENDING;
    $project_data['reason'] = t('No available update data');
    $project_data['fetch_status'] = $available['fetch_status'];
    return;
  }

  // Defend ourselves from XML history files that contain no releases.
  if (empty($available['releases'])) {
    $project_data['status'] = UPDATE_UNKNOWN;
    $project_data['reason'] = t('No available releases found');
    return;
  }
  foreach ($available['releases'] as $version => $release) {
    // First, if this is the existing release, check a few conditions.
    if ($project_data['existing_version'] === $version) {
      if (isset($release['terms']['Release type']) && 
        in_array('Insecure', $release['terms']['Release type'])) {
        $project_data['status'] = UPDATE_NOT_SECURE;
      }
      elseif ($release['status'] == 'unpublished') {
        $project_data['status'] = UPDATE_REVOKED;
        if (empty($project_data['extra'])) {
          $project_data['extra'] = array();
        }
        $project_data['extra'][] = array(
          'class' => array('release-revoked'),
          'label' => t('Release revoked'),
          'data' => t('Your currently installed release has been revoked, and is no longer available for download. Disabling everything included in this release or upgrading is strongly recommended!'),
        );
      }
      elseif (isset($release['terms']['Release type']) && 
        in_array('Unsupported', $release['terms']['Release type'])) {
        $project_data['status'] = UPDATE_NOT_SUPPORTED;
        if (empty($project_data['extra'])) {
          $project_data['extra'] = array();
        }
        $project_data['extra'][] = array(
          'class' => array('release-not-supported'),
          'label' => t('Release not supported'),
          'data' => t('Your currently installed release is now unsupported, and is no longer available for download. Disabling everything included in this release or upgrading is strongly recommended!'),
        );
      }
    }

    // Otherwise, ignore unpublished, insecure, or unsupported releases.
    if ($release['status'] == 'unpublished' || 
      (isset($release['terms']['Release type']) &&
        (in_array('Insecure', $release['terms']['Release type']) ||
        in_array('Unsupported', $release['terms']['Release type'])))) {
      continue;
    }

    // See if this is a higher major version than our target and yet still
    // supported. If so, record it as an "Also available" release.
    // Note: some projects have a HEAD release from CVS days, which could
    // be one of those being compared. They would not have version_major
    // set, so we must call isset first.
    if (isset($release['version_major']) && $release['version_major'] > $target_major) {
      if (in_array($release['version_major'], $supported_majors)) {
        if (!isset($project_data['also'])) {
          $project_data['also'] = array();
        }
        if (!isset($project_data['also'][$release['version_major']])) {
          $project_data['also'][$release['version_major']] = $version;
          $project_data['releases'][$version] = $release;
        }
      }
      // Otherwise, this release can't matter to us, since it's neither
      // from the release series we're currently using nor the recommended
      // release. We don't even care about security updates for this
      // branch, since if a project maintainer puts out a security release
      // at a higher major version and not at the lower major version,
      // they must remove the lower version from the supported major
      // versions at the same time, in which case we won't hit this code.
      continue;
    }

    // Look for the 'latest version' if we haven't found it yet. Latest is
    // defined as the most recent version for the target major version.
    if (!isset($project_data['latest_version'])
     && $release['version_major'] == $target_major) {
      $project_data['latest_version'] = $version;
      $project_data['releases'][$version] = $release;
    }

    // Look for the development snapshot release for this branch.
    if (!isset($project_data['dev_version'])
     && $release['version_major'] == $target_major
       && isset($release['version_extra'])
       && $release['version_extra'] == 'dev') {
      $project_data['dev_version'] = $version;
      $project_data['releases'][$version] = $release;
    }

    // Look for the 'recommended' version if we haven't found it yet (see
    // phpdoc at the top of this function for the definition).
    if (!isset($project_data['recommended'])
     && $release['version_major'] == $target_major
       && isset($release['version_patch'])) {
      if ($patch != $release['version_patch']) {
        $patch = $release['version_patch'];
        $release_patch_changed = $release;
      }
      if (empty($release['version_extra']) && $patch == $release['version_patch']) {
        $project_data['recommended'] = $release_patch_changed['version'];
        $project_data['releases'][$release_patch_changed['version']] = $release_patch_changed;
      }
    }

    // Stop searching once we hit the currently installed version.
    if ($project_data['existing_version'] === $version) {
      break;
    }

    // If we're running a dev snapshot and have a timestamp, stop
    // searching for security updates once we hit an official release
    // older than what we've got. Allow 100 seconds of leeway to handle
    // differences between the datestamp in the .info file and the
    // timestamp of the tarball itself (which are usually off by 1 or 2
    // seconds) so that we don't flag that as a new release.
    if ($project_data['install_type'] == 'dev') {
      if (empty($project_data['datestamp'])) {
        // We don't have current timestamp info, so we can't know.
        continue;
      }
      elseif (isset($release['date']) && ($project_data['datestamp'] + 100 > $release['date'])) {
        // We're newer than this, so we can skip it.
        continue;
      }
    }

    // See if this release is a security update.
    if (isset($release['terms']['Release type'])
     && in_array('Security update', $release['terms']['Release type'])) {
      $project_data['security updates'][] = $release;
    }
  }

  // If we were unable to find a recommended version, then make the latest
  // version the recommended version if possible.
  if (!isset($project_data['recommended']) && isset($project_data['latest_version'])) {
    $project_data['recommended'] = $project_data['latest_version'];
  }

  //
  // Check to see if we need an update or not.
  //

  if (!empty($project_data['security updates'])) {
    // If we found security updates, that always trumps any other status.
    $project_data['status'] = UPDATE_NOT_SECURE;
  }

  if (isset($project_data['status'])) {
    // If we already know the status, we're done.
    return;
  }

  // If we don't know what to recommend, there's nothing we can report.
  // Bail out early.
  if (!isset($project_data['recommended'])) {
    $project_data['status'] = UPDATE_UNKNOWN;
    $project_data['reason'] = t('No available releases found');
    return;
  }

  // If we're running a dev snapshot, compare the date of the dev snapshot
  // with the latest official version, and record the absolute latest in
  // 'latest_dev' so we can correctly decide if there's a newer release
  // than our current snapshot.
  if ($project_data['install_type'] == 'dev') {
    if (isset($project_data['dev_version']) && $available['releases'][$project_data['dev_version']]['date'] > $available['releases'][$project_data['latest_version']]['date']) {
      $project_data['latest_dev'] = $project_data['dev_version'];
    }
    else {
      $project_data['latest_dev'] = $project_data['latest_version'];
    }
  }

  // Figure out the status, based on what we've seen and the install type.
  switch ($project_data['install_type']) {
    case 'official':
      if ($project_data['existing_version'] === $project_data['recommended'] || $project_data['existing_version'] === $project_data['latest_version']) {
        $project_data['status'] = UPDATE_CURRENT;
      }
      else {
        $project_data['status'] = UPDATE_NOT_CURRENT;
      }
      break;

    case 'dev':
      $latest = $available['releases'][$project_data['latest_dev']];
      if (empty($project_data['datestamp'])) {
        $project_data['status'] = UPDATE_NOT_CHECKED;
        $project_data['reason'] = t('Unknown release date');
      }
      elseif (($project_data['datestamp'] + 100 > $latest['date'])) {
        $project_data['status'] = UPDATE_CURRENT;
      }
      else {
        $project_data['status'] = UPDATE_NOT_CURRENT;
      }
      break;

    default:
      $project_data['status'] = UPDATE_UNKNOWN;
      $project_data['reason'] = t('Invalid info');
  }
}