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PhabricatorS3FileStorageEngine.php
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Tue, Dec 24, 03:30

PhabricatorS3FileStorageEngine.php
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<?php
/**
* Amazon S3 file storage engine. This engine scales well but is relatively
* high-latency since data has to be pulled off S3.
*
* @task internal Internals
*/
final class PhabricatorS3FileStorageEngine
extends PhabricatorFileStorageEngine {
/* -( Implementation )----------------------------------------------------- */
/**
* This engine identifies as `amazon-s3`.
*/
public function getEngineIdentifier() {
return 'amazon-s3';
}
/**
* Writes file data into Amazon S3.
*/
public function writeFile($data, array $params) {
$s3 = $this->newS3API();
// Generate a random name for this file. We add some directories to it
// (e.g. 'abcdef123456' becomes 'ab/cd/ef123456') to make large numbers of
// files more browsable with web/debugging tools like the S3 administration
// tool.
$seed = Filesystem::readRandomCharacters(20);
$parts = array(
substr($seed, 0, 2),
substr($seed, 2, 2),
substr($seed, 4),
);
$name = 'phabricator/'.implode('/', $parts);
AphrontWriteGuard::willWrite();
$s3->putObject(
$data,
$this->getBucketName(),
$name,
$acl = 'private');
return $name;
}
/**
* Load a stored blob from Amazon S3.
*/
public function readFile($handle) {
$result = $this->newS3API()->getObject(
$this->getBucketName(),
$handle);
// NOTE: The implementation of the API that we're using may respond with
// a successful result that has length 0 and no body property.
if (isset($result->body)) {
return $result->body;
} else {
return '';
}
}
/**
* Delete a blob from Amazon S3.
*/
public function deleteFile($handle) {
AphrontWriteGuard::willWrite();
$this->newS3API()->deleteObject(
$this->getBucketName(),
$handle);
}
/* -( Internals )---------------------------------------------------------- */
/**
* Retrieve the S3 bucket name.
*
* @task internal
*/
private function getBucketName() {
$bucket = PhabricatorEnv::getEnvConfig('storage.s3.bucket');
if (!$bucket) {
throw new PhabricatorFileStorageConfigurationException(
"No 'storage.s3.bucket' specified!");
}
return $bucket;
}
/**
* Create a new S3 API object.
*
* @task internal
* @phutil-external-symbol class S3
*/
private function newS3API() {
$libroot = dirname(phutil_get_library_root('phabricator'));
require_once $libroot.'/externals/s3/S3.php';
$access_key = PhabricatorEnv::getEnvConfig('amazon-s3.access-key');
$secret_key = PhabricatorEnv::getEnvConfig('amazon-s3.secret-key');
$endpoint = PhabricatorEnv::getEnvConfig('amazon-s3.endpoint');
if (!$access_key || !$secret_key) {
throw new PhabricatorFileStorageConfigurationException(
"Specify 'amazon-s3.access-key' and 'amazon-s3.secret-key'!");
}
if ($endpoint !== null) {
$s3 = new S3($access_key, $secret_key, $use_ssl = true, $endpoint);
} else {
$s3 = new S3($access_key, $secret_key, $use_ssl = true);
}
$s3->setExceptions(true);
return $s3;
}
}

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