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PhabricatorImageRemarkupRule.php
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Fri, Jan 31, 09:54

PhabricatorImageRemarkupRule.php
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<?php
final class PhabricatorImageRemarkupRule extends PhutilRemarkupRule {
const KEY_RULE_EXTERNAL_IMAGE = 'rule.external-image';
public function getPriority() {
return 200.0;
}
public function apply($text) {
return preg_replace_callback(
'@{(image|img) ((?:[^}\\\\]+|\\\\.)*)}@m',
array($this, 'markupImage'),
$text);
}
public function markupImage(array $matches) {
if (!$this->isFlatText($matches[0])) {
return $matches[0];
}
$args = array();
$defaults = array(
'uri' => null,
'alt' => null,
'width' => null,
'height' => null,
);
$trimmed_match = trim($matches[2]);
if ($this->isURI($trimmed_match)) {
$args['uri'] = $trimmed_match;
} else {
$parser = new PhutilSimpleOptions();
$keys = $parser->parse($trimmed_match);
$uri_key = '';
foreach (array('src', 'uri', 'url') as $key) {
if (array_key_exists($key, $keys)) {
$uri_key = $key;
}
}
if ($uri_key) {
$args['uri'] = $keys[$uri_key];
}
$args += $keys;
}
$args += $defaults;
if (!strlen($args['uri'])) {
return $matches[0];
}
// Make sure this is something that looks roughly like a real URI. We'll
// validate it more carefully before proxying it, but if whatever the user
// has typed isn't even close, just decline to activate the rule behavior.
try {
$uri = new PhutilURI($args['uri']);
if (!strlen($uri->getProtocol())) {
return $matches[0];
}
$args['uri'] = (string)$uri;
} catch (Exception $ex) {
return $matches[0];
}
$engine = $this->getEngine();
$metadata_key = self::KEY_RULE_EXTERNAL_IMAGE;
$metadata = $engine->getTextMetadata($metadata_key, array());
$token = $engine->storeText('<img>');
$metadata[] = array(
'token' => $token,
'args' => $args,
);
$engine->setTextMetadata($metadata_key, $metadata);
return $token;
}
public function didMarkupText() {
$engine = $this->getEngine();
$metadata_key = self::KEY_RULE_EXTERNAL_IMAGE;
$images = $engine->getTextMetadata($metadata_key, array());
$engine->setTextMetadata($metadata_key, array());
if (!$images) {
return;
}
// Look for images we've already successfully fetched that aren't about
// to get eaten by the GC. For any we find, we can just emit a normal
// "<img />" tag pointing directly to the file.
// For files which we don't hit in the cache, we emit a placeholder
// instead and use AJAX to actually perform the fetch.
$digests = array();
foreach ($images as $image) {
$uri = $image['args']['uri'];
$digests[] = PhabricatorHash::digestForIndex($uri);
}
$caches = id(new PhabricatorFileExternalRequest())->loadAllWhere(
'uriIndex IN (%Ls) AND isSuccessful = 1 AND ttl > %d',
$digests,
PhabricatorTime::getNow() + phutil_units('1 hour in seconds'));
$file_phids = array();
foreach ($caches as $cache) {
$file_phids[$cache->getFilePHID()] = $cache->getURI();
}
$file_map = array();
if ($file_phids) {
$files = id(new PhabricatorFileQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withPHIDs(array_keys($file_phids))
->execute();
foreach ($files as $file) {
$phid = $file->getPHID();
$file_remote_uri = $file_phids[$phid];
$file_view_uri = $file->getViewURI();
$file_map[$file_remote_uri] = $file_view_uri;
}
}
foreach ($images as $image) {
$args = $image['args'];
$uri = $args['uri'];
$direct_uri = idx($file_map, $uri);
if ($direct_uri) {
$img = phutil_tag(
'img',
array(
'src' => $direct_uri,
'alt' => $args['alt'],
'width' => $args['width'],
'height' => $args['height'],
));
} else {
$src_uri = id(new PhutilURI('/file/imageproxy/'))
->setQueryParam('uri', $uri);
$img = id(new PHUIRemarkupImageView())
->setURI($src_uri)
->setAlt($args['alt'])
->setWidth($args['width'])
->setHeight($args['height']);
}
$engine->overwriteStoredText($image['token'], $img);
}
}
private function isURI($uri_string) {
// Very simple check to make sure it starts with either http or https.
// If it does, we'll try to treat it like a valid URI
return preg_match('~^https?\:\/\/.*\z~i', $uri_string);
}
}

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