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phorge/src/applications/files/favicon/PhabricatorFaviconRef.php
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PhabricatorFaviconRef.php
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<?php
final class PhabricatorFaviconRef extends Phobject {
private $viewer;
private $width;
private $height;
private $emblems;
private $uri;
private $cacheKey;
public function __construct() {
$this->emblems = array(null, null, null, null);
}
public function setViewer(PhabricatorUser $viewer) {
$this->viewer = $viewer;
return $this;
}
public function getViewer() {
return $this->viewer;
}
public function setWidth($width) {
$this->width = $width;
return $this;
}
public function getWidth() {
return $this->width;
}
public function setHeight($height) {
$this->height = $height;
return $this;
}
public function getHeight() {
return $this->height;
}
public function setEmblems(array $emblems) {
if (count($emblems) !== 4) {
throw new Exception(
pht(
'Expected four elements in icon emblem list. To omit an emblem, '.
'pass "null".'));
}
$this->emblems = $emblems;
return $this;
}
public function getEmblems() {
return $this->emblems;
}
public function setURI($uri) {
$this->uri = $uri;
return $this;
}
public function getURI() {
return $this->uri;
}
public function setCacheKey($cache_key) {
$this->cacheKey = $cache_key;
return $this;
}
public function getCacheKey() {
return $this->cacheKey;
}
public function newDigest() {
return PhabricatorHash::digestForIndex(serialize($this->toDictionary()));
}
public function toDictionary() {
return array(
'width' => $this->width,
'height' => $this->height,
'emblems' => $this->emblems,
);
}
public static function newConfigurationDigest() {
$all_resources = self::getAllResources();
// Because we need to access this cache on every page, it's very sticky.
// Try to dirty it automatically if any relevant configuration changes.
$inputs = array(
'resources' => $all_resources,
'prod' => PhabricatorEnv::getProductionURI('/'),
'cdn' => PhabricatorEnv::getEnvConfig('security.alternate-file-domain'),
'havepng' => function_exists('imagepng'),
);
return PhabricatorHash::digestForIndex(serialize($inputs));
}
private static function getAllResources() {
$custom_resources = PhabricatorEnv::getEnvConfig('ui.favicons');
foreach ($custom_resources as $key => $custom_resource) {
$custom_resources[$key] = array(
'source-type' => 'file',
'default' => false,
) + $custom_resource;
}
$builtin_resources = self::getBuiltinResources();
return array_merge($builtin_resources, $custom_resources);
}
private static function getBuiltinResources() {
return array(
array(
'source-type' => 'builtin',
'source' => 'favicon/default-76x76.png',
'version' => 1,
'width' => 76,
'height' => 76,
'default' => true,
),
array(
'source-type' => 'builtin',
'source' => 'favicon/default-120x120.png',
'version' => 1,
'width' => 120,
'height' => 120,
'default' => true,
),
array(
'source-type' => 'builtin',
'source' => 'favicon/default-128x128.png',
'version' => 1,
'width' => 128,
'height' => 128,
'default' => true,
),
array(
'source-type' => 'builtin',
'source' => 'favicon/default-152x152.png',
'version' => 1,
'width' => 152,
'height' => 152,
'default' => true,
),
array(
'source-type' => 'builtin',
'source' => 'favicon/dot-pink-64x64.png',
'version' => 1,
'width' => 64,
'height' => 64,
'emblem' => 'dot-pink',
'default' => true,
),
array(
'source-type' => 'builtin',
'source' => 'favicon/dot-red-64x64.png',
'version' => 1,
'width' => 64,
'height' => 64,
'emblem' => 'dot-red',
'default' => true,
),
);
}
public function newURI() {
$dst_w = $this->getWidth();
$dst_h = $this->getHeight();
$template = $this->newTemplateFile(null, $dst_w, $dst_h);
$template_file = $template['file'];
$cache = $this->loadCachedFile($template_file);
if ($cache) {
return $cache->getViewURI();
}
$data = $this->newCompositedFavicon($template);
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
$caught = null;
try {
$favicon_file = $this->newFaviconFile($data);
$xform = id(new PhabricatorTransformedFile())
->setOriginalPHID($template_file->getPHID())
->setTransformedPHID($favicon_file->getPHID())
->setTransform($this->getCacheKey());
try {
$xform->save();
} catch (AphrontDuplicateKeyQueryException $ex) {
unset($unguarded);
$cache = $this->loadCachedFile($template_file);
if (!$cache) {
throw $ex;
}
id(new PhabricatorDestructionEngine())
->destroyObject($favicon_file);
return $cache->getViewURI();
}
} catch (Exception $ex) {
$caught = $ex;
}
unset($unguarded);
if ($caught) {
throw $caught;
}
return $favicon_file->getViewURI();
}
private function loadCachedFile(PhabricatorFile $template_file) {
$viewer = $this->getViewer();
$xform = id(new PhabricatorTransformedFile())->loadOneWhere(
'originalPHID = %s AND transform = %s',
$template_file->getPHID(),
$this->getCacheKey());
if (!$xform) {
return null;
}
return id(new PhabricatorFileQuery())
->setViewer($viewer)
->withPHIDs(array($xform->getTransformedPHID()))
->executeOne();
}
private function newCompositedFavicon($template) {
$dst_w = $this->getWidth();
$dst_h = $this->getHeight();
$src_w = $template['width'];
$src_h = $template['height'];
try {
$template_data = $template['file']->loadFileData();
} catch (Exception $ex) {
// In rare cases, we can end up with a corrupted or inaccessible file.
// If we do, just give up: otherwise, it's impossible to get pages to
// generate and not obvious how to fix it.
return null;
}
if (!function_exists('imagecreatefromstring')) {
return $template_data;
}
$src = @imagecreatefromstring($template_data);
if (!$src) {
return $template_data;
}
$dst = imagecreatetruecolor($dst_w, $dst_h);
imagesavealpha($dst, true);
$transparent = imagecolorallocatealpha($dst, 0, 255, 0, 127);
imagefill($dst, 0, 0, $transparent);
imagecopyresampled(
$dst,
$src,
0,
0,
0,
0,
$dst_w,
$dst_h,
$src_w,
$src_h);
// Now, copy any icon emblems on top of the image. These are dots or other
// marks used to indicate status information.
$emblem_w = (int)floor(min($dst_w, $dst_h) / 2);
$emblem_h = $emblem_w;
foreach ($this->emblems as $key => $emblem) {
if ($emblem === null) {
continue;
}
$emblem_template = $this->newTemplateFile(
$emblem,
$emblem_w,
$emblem_h);
switch ($key) {
case 0:
$emblem_x = $dst_w - $emblem_w;
$emblem_y = 0;
break;
case 1:
$emblem_x = $dst_w - $emblem_w;
$emblem_y = $dst_h - $emblem_h;
break;
case 2:
$emblem_x = 0;
$emblem_y = $dst_h - $emblem_h;
break;
case 3:
$emblem_x = 0;
$emblem_y = 0;
break;
}
$emblem_data = $emblem_template['file']->loadFileData();
$src = @imagecreatefromstring($emblem_data);
if (!$src) {
continue;
}
imagecopyresampled(
$dst,
$src,
$emblem_x,
$emblem_y,
0,
0,
$emblem_w,
$emblem_h,
$emblem_template['width'],
$emblem_template['height']);
}
return PhabricatorImageTransformer::saveImageDataInAnyFormat(
$dst,
'image/png');
}
private function newTemplateFile($emblem, $width, $height) {
$all_resources = self::getAllResources();
$scores = array();
$ratio = $width / $height;
foreach ($all_resources as $key => $resource) {
// We can't use an emblem resource for a different emblem, nor for an
// icon base. We also can't use an icon base as an emblem. That is, if
// we're looking for a picture of a red dot, we have to actually find
// a red dot, not just any image which happens to have a similar size.
if (idx($resource, 'emblem') !== $emblem) {
continue;
}
$resource_width = $resource['width'];
$resource_height = $resource['height'];
// Never use a resource with a different aspect ratio.
if (($resource_width / $resource_height) !== $ratio) {
continue;
}
// Try to use custom resources instead of default resources.
if ($resource['default']) {
$default_score = 1;
} else {
$default_score = 0;
}
$width_diff = ($resource_width - $width);
// If we have to resize an image, we'd rather scale a larger image down
// than scale a smaller image up.
if ($width_diff < 0) {
$scale_score = 1;
} else {
$scale_score = 0;
}
// Otherwise, we'd rather scale an image a little bit (ideally, zero)
// than scale an image a lot.
$width_score = abs($width_diff);
$scores[$key] = id(new PhutilSortVector())
->addInt($default_score)
->addInt($scale_score)
->addInt($width_score);
}
if (!$scores) {
if ($emblem === null) {
throw new Exception(
pht(
'Found no background template resource for dimensions %dx%d.',
$width,
$height));
} else {
throw new Exception(
pht(
'Found no template resource (for emblem "%s") with dimensions '.
'%dx%d.',
$emblem,
$width,
$height));
}
}
$scores = msortv($scores, 'getSelf');
$best_score = head_key($scores);
$viewer = $this->getViewer();
$resource = $all_resources[$best_score];
if ($resource['source-type'] === 'builtin') {
$file = PhabricatorFile::loadBuiltin($viewer, $resource['source']);
if (!$file) {
throw new Exception(
pht(
'Failed to load favicon template builtin "%s".',
$resource['source']));
}
} else {
$file = id(new PhabricatorFileQuery())
->setViewer($viewer)
->withPHIDs(array($resource['source']))
->executeOne();
if (!$file) {
throw new Exception(
pht(
'Failed to load favicon template with PHID "%s".',
$resource['source']));
}
}
return array(
'width' => $resource['width'],
'height' => $resource['height'],
'file' => $file,
);
}
private function newFaviconFile($data) {
return PhabricatorFile::newFromFileData(
$data,
array(
'name' => 'favicon',
'canCDN' => true,
));
}
}

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