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CelerityStaticResourceResponse.php
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Mon, Jan 13, 16:07

CelerityStaticResourceResponse.php
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<?php
/**
* Tracks and resolves dependencies the page declares with
* @{function:require_celerity_resource}, and then builds appropriate HTML or
* Ajax responses.
*/
final class CelerityStaticResourceResponse {
private $symbols = array();
private $needsResolve = true;
private $resolved;
private $packaged;
private $metadata = array();
private $metadataBlock = 0;
private $behaviors = array();
private $hasRendered = array();
public function __construct() {
if (isset($_REQUEST['__metablock__'])) {
$this->metadataBlock = (int)$_REQUEST['__metablock__'];
}
}
public function addMetadata($metadata) {
$id = count($this->metadata);
$this->metadata[$id] = $metadata;
return $this->metadataBlock.'_'.$id;
}
public function getMetadataBlock() {
return $this->metadataBlock;
}
/**
* Register a behavior for initialization. NOTE: if $config is empty,
* a behavior will execute only once even if it is initialized multiple times.
* If $config is nonempty, the behavior will be invoked once for each config.
*/
public function initBehavior(
$behavior,
array $config = array(),
$source_name) {
$this->requireResource('javelin-behavior-'.$behavior, $source_name);
if (empty($this->behaviors[$behavior])) {
$this->behaviors[$behavior] = array();
}
if ($config) {
$this->behaviors[$behavior][] = $config;
}
return $this;
}
public function requireResource($symbol, $source_name) {
if (isset($this->symbols[$source_name][$symbol])) {
return $this;
}
// Verify that the resource exists.
$map = CelerityResourceMap::getNamedInstance($source_name);
$name = $map->getResourceNameForSymbol($symbol);
if ($name === null) {
throw new Exception(
pht(
'No resource with symbol "%s" exists in source "%s"!',
$symbol,
$source_name));
}
$this->symbols[$source_name][$symbol] = true;
$this->needsResolve = true;
return $this;
}
private function resolveResources() {
if ($this->needsResolve) {
$this->packaged = array();
foreach ($this->symbols as $source_name => $symbols_map) {
$symbols = array_keys($symbols_map);
$map = CelerityResourceMap::getNamedInstance($source_name);
$packaged = $map->getPackagedNamesForSymbols($symbols);
$this->packaged[$source_name] = $packaged;
}
$this->needsResolve = false;
}
return $this;
}
public function renderSingleResource($symbol, $source_name) {
$map = CelerityResourceMap::getNamedInstance($source_name);
$packaged = $map->getPackagedNamesForSymbols(array($symbol));
return $this->renderPackagedResources($map, $packaged);
}
public function renderResourcesOfType($type) {
$this->resolveResources();
$result = array();
foreach ($this->packaged as $source_name => $resource_names) {
$map = CelerityResourceMap::getNamedInstance($source_name);
$resources_of_type = array();
foreach ($resource_names as $resource_name) {
$resource_type = $map->getResourceTypeForName($resource_name);
if ($resource_type == $type) {
$resources_of_type[] = $resource_name;
}
}
$result[] = $this->renderPackagedResources($map, $resources_of_type);
}
return phutil_implode_html('', $result);
}
private function renderPackagedResources(
CelerityResourceMap $map,
array $resources) {
$output = array();
foreach ($resources as $name) {
if (isset($this->hasRendered[$name])) {
continue;
}
$this->hasRendered[$name] = true;
$output[] = $this->renderResource($map, $name);
}
return $output;
}
private function renderResource(
CelerityResourceMap $map,
$name) {
$uri = $this->getURI($map, $name);
$type = $map->getResourceTypeForName($name);
$multimeter = MultimeterControl::getInstance();
if ($multimeter) {
$event_type = MultimeterEvent::TYPE_STATIC_RESOURCE;
$multimeter->newEvent($event_type, 'rsrc.'.$name, 1);
}
switch ($type) {
case 'css':
return phutil_tag(
'link',
array(
'rel' => 'stylesheet',
'type' => 'text/css',
'href' => $uri,
));
case 'js':
return phutil_tag(
'script',
array(
'type' => 'text/javascript',
'src' => $uri,
),
'');
}
throw new Exception(
pht(
'Unable to render resource "%s", which has unknown type "%s".',
$name,
$type));
}
public function renderHTMLFooter() {
$data = array();
if ($this->metadata) {
$json_metadata = AphrontResponse::encodeJSONForHTTPResponse(
$this->metadata);
$this->metadata = array();
} else {
$json_metadata = '{}';
}
// Even if there is no metadata on the page, Javelin uses the mergeData()
// call to start dispatching the event queue.
$data[] = 'JX.Stratcom.mergeData('.$this->metadataBlock.', '.
$json_metadata.');';
$onload = array();
if ($this->behaviors) {
$behaviors = $this->behaviors;
$this->behaviors = array();
$higher_priority_names = array(
'refresh-csrf',
'aphront-basic-tokenizer',
'dark-console',
'history-install',
);
$higher_priority_behaviors = array_select_keys(
$behaviors,
$higher_priority_names);
foreach ($higher_priority_names as $name) {
unset($behaviors[$name]);
}
$behavior_groups = array(
$higher_priority_behaviors,
$behaviors,
);
foreach ($behavior_groups as $group) {
if (!$group) {
continue;
}
$group_json = AphrontResponse::encodeJSONForHTTPResponse(
$group);
$onload[] = 'JX.initBehaviors('.$group_json.')';
}
}
if ($onload) {
foreach ($onload as $func) {
$data[] = 'JX.onload(function(){'.$func.'});';
}
}
if ($data) {
$data = implode("\n", $data);
return self::renderInlineScript($data);
} else {
return '';
}
}
public static function renderInlineScript($data) {
if (stripos($data, '</script>') !== false) {
throw new Exception(
'Literal </script> is not allowed inside inline script.');
}
if (strpos($data, '<!') !== false) {
throw new Exception('Literal <! is not allowed inside inline script.');
}
// We don't use <![CDATA[ ]]> because it is ignored by HTML parsers. We
// would need to send the document with XHTML content type.
return phutil_tag(
'script',
array('type' => 'text/javascript'),
phutil_safe_html($data));
}
public function buildAjaxResponse($payload, $error = null) {
$response = array(
'error' => $error,
'payload' => $payload,
);
if ($this->metadata) {
$response['javelin_metadata'] = $this->metadata;
$this->metadata = array();
}
if ($this->behaviors) {
$response['javelin_behaviors'] = $this->behaviors;
$this->behaviors = array();
}
$this->resolveResources();
$resources = array();
foreach ($this->packaged as $source_name => $resource_names) {
$map = CelerityResourceMap::getNamedInstance($source_name);
foreach ($resource_names as $resource_name) {
$resources[] = $this->getURI($map, $resource_name);
}
}
if ($resources) {
$response['javelin_resources'] = $resources;
}
return $response;
}
public function getURI(
CelerityResourceMap $map,
$name,
$use_primary_domain = false) {
$uri = $map->getURIForName($name);
// In developer mode, we dump file modification times into the URI. When a
// page is reloaded in the browser, any resources brought in by Ajax calls
// do not trigger revalidation, so without this it's very difficult to get
// changes to Ajaxed-in CSS to work (you must clear your cache or rerun
// the map script). In production, we can assume the map script gets run
// after changes, and safely skip this.
if (PhabricatorEnv::getEnvConfig('phabricator.developer-mode')) {
$mtime = $map->getModifiedTimeForName($name);
$uri = preg_replace('@^/res/@', '/res/'.$mtime.'T/', $uri);
}
if ($use_primary_domain) {
return PhabricatorEnv::getURI($uri);
} else {
return PhabricatorEnv::getCDNURI($uri);
}
}
}

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