silverstripe-externallinks/src/Tasks/CheckExternalLinksTask.php

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<?php
class CheckExternalLinksTask extends BuildTask {
private static $dependencies = array(
'LinkChecker' => '%$LinkChecker'
);
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/**
* @var bool
*/
protected $silent = false;
/**
* @var LinkChecker
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*/
protected $linkChecker;
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protected $title = 'Checking broken External links in the SiteTree';
protected $description = 'A task that records external broken links in the SiteTree';
protected $enabled = true;
/**
* Log a message
*
* @param string $message
*/
protected function log($message) {
if(!$this->silent) Debug::message($message);
}
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public function run($request) {
$this->runLinksCheck();
}
/**
* Turn on or off message output
*
* @param bool $silent
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*/
public function setSilent($silent) {
$this->silent = $silent;
}
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/**
* @param LinkChecker $linkChecker
*/
public function setLinkChecker(LinkChecker $linkChecker) {
$this->linkChecker = $linkChecker;
}
/**
* @return LinkChecker
*/
public function getLinkChecker() {
return $this->linkChecker;
}
/**
* Check the status of a single link on a page
*
* @param BrokenExternalPageTrack $pageTrack
* @param DOMNode $link
*/
protected function checkPageLink(BrokenExternalPageTrack $pageTrack, DOMNode $link) {
$class = $link->getAttribute('class');
$href = $link->getAttribute('href');
$markedBroken = preg_match('/\b(ss-broken)\b/', $class);
// Check link
$httpCode = $this->linkChecker->checkLink($href);
if($httpCode === null) return; // Null link means uncheckable, such as an internal link
// If this code is broken then mark as such
if($foundBroken = $this->isCodeBroken($httpCode)) {
// Create broken record
$brokenLink = new BrokenExternalLink();
$brokenLink->Link = $href;
$brokenLink->HTTPCode = $httpCode;
$brokenLink->TrackID = $pageTrack->ID;
$brokenLink->StatusID = $pageTrack->StatusID; // Slight denormalisation here for performance reasons
$brokenLink->write();
}
// Check if we need to update CSS class, otherwise return
if($markedBroken == $foundBroken) return;
if($foundBroken) {
$class .= ' ss-broken';
} else {
$class = preg_replace('/\s*\b(ss-broken)\b\s*/', ' ', $class);
}
$link->setAttribute('class', trim($class));
}
/**
* Determine if the given HTTP code is "broken"
*
* @param int $httpCode
* @return bool True if this is a broken code
*/
protected function isCodeBroken($httpCode) {
// Null represents no request attempted
if($httpCode === null) return false;
// do we have any whitelisted codes
$ignoreCodes = Config::inst()->get('CheckExternalLinks', 'IgnoreCodes');
if(is_array($ignoreCodes) && in_array($httpCode, $ignoreCodes)) return false;
// Check if code is outside valid range
return $httpCode < 200 || $httpCode > 302;
}
/**
* Runs the links checker and returns the track used
*
* @param int $limit Limit to number of pages to run, or null to run all
* @return BrokenExternalPageTrackStatus
*/
public function runLinksCheck($limit = null) {
// Check the current status
$status = BrokenExternalPageTrackStatus::get_or_create();
// Calculate pages to run
$pageTracks = $status->getIncompleteTracks();
if($limit) $pageTracks = $pageTracks->limit($limit);
// Check each page
foreach ($pageTracks as $pageTrack) {
// Flag as complete
$pageTrack->Processed = 1;
$pageTrack->write();
// Check value of html area
$page = $pageTrack->Page();
$this->log("Checking {$page->Title}");
$htmlValue = Injector::inst()->create('HTMLValue', $page->Content);
if (!$htmlValue->isValid()) continue;
// Check each link
$links = $htmlValue->getElementsByTagName('a');
foreach($links as $link) {
$this->checkPageLink($pageTrack, $link);
}
// Update content of page based on link fixes / breakages
$htmlValue->saveHTML();
$page->Content = $htmlValue->getContent();
$page->write();
// Once all links have been created for this page update HasBrokenLinks
$count = $pageTrack->BrokenLinks()->count();
$this->log("Found {$count} broken links");
if($count) {
// Bypass the ORM as syncLinkTracking does not allow you to update HasBrokenLink to true
DB::query(sprintf(
'UPDATE "SiteTree" SET "HasBrokenLink" = 1 WHERE "ID" = \'%d\'',
intval($pageTrack->ID)
));
}
}
$status->updateJobInfo('Updating completed pages');
$status->updateStatus();
return $status;
}
private function updateCompletedPages($trackID = 0) {
$noPages = BrokenExternalPageTrack::get()
->filter(array(
'TrackID' => $trackID,
'Processed' => 1
))
->count();
$track = BrokenExternalPageTrackStatus::get_latest();
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$track->CompletedPages = $noPages;
$track->write();
return $noPages;
}
private function updateJobInfo($message) {
$track = BrokenExternalPageTrackStatus::get_latest();
if($track) {
$track->JobInfo = $message;
$track->write();
}
}
}