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SAAS-505: Extract Amazon_S3 class and have it inherit from a general 'cloud backend' class

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drigato 2014-12-01 21:05:46 -05:00
parent 432245b18e
commit 7c0a25be7f
7 changed files with 194 additions and 133 deletions
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77
airtime_mvc/application/models/airtime/CloudFile.php
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@ -1,13 +1,13 @@
<?php
require_once 'Amazon_S3.php';
require_once 'ProxyStorageBackend.php';
/**
* Skeleton subclass for representing a row from the 'cloud_file' table.
*
* Each cloud_file has a corresponding cc_file referenced as a foreign key.
* The file's metadata is stored in the cc_file table. This, cloud_file,
* table represents files that are stored on Amazon S3.
* table represents files that are stored in the cloud.
*
* You should add additional methods to this class to meet the
* application requirements. This class will only be generated as
@ -17,6 +17,7 @@ require_once 'Amazon_S3.php';
*/
class CloudFile extends BaseCloudFile
{
private $proxyStorageBackend;
/**
* Returns a signed URL to the file's object on Amazon S3. Since we are
@ -25,7 +26,10 @@ class CloudFile extends BaseCloudFile
*/
public function getURLForTrackPreviewOrDownload()
{
return $this->getAbsoluteFilePath()."?".$this->getAuthenticationParams();
if ($this->proxyStorageBackend == null) {
$this->proxyStorageBackend = new ProxyStorageBackend($this->getStorageBackend());
}
return $this->proxyStorageBackend->getSignedURL($this->getResourceId());
}
/**
@ -34,39 +38,10 @@ class CloudFile extends BaseCloudFile
*/
public function getAbsoluteFilePath()
{
$amazon_s3 = new Amazon_S3();
$zend_s3 = $amazon_s3->getZendServiceAmazonS3();
$resource_id = $this->getResourceId();
$endpoint = $zend_s3->getEndpoint();
$scheme = $endpoint->getScheme();
$host = $endpoint->getHost();
$s3_bucket = $amazon_s3->getBucket();
return "$scheme://$s3_bucket.$host/".utf8_encode($resource_id);
}
/**
*
* Returns a string of authentication paramaters to append to the cloud
* object's URL. We need this for track preview and download because the
* objects are privately stored on Amazon S3.
*/
public function getAuthenticationParams()
{
$expires = time()+120;
$resource_id = $this->getResourceId();
$amazon_s3 = new Amazon_S3();
$s3_bucket = $amazon_s3->getBucket();
$s3_secret_key = $amazon_s3->getSecretKey();
$s3_access_key = $amazon_s3->getAccessKey();
$string_to_sign = utf8_encode("GET\n\n\n$expires\n/$s3_bucket/$resource_id");
// We need to urlencode the entire signature in case the hashed signature
// has spaces. (NOTE: utf8_encode() does not work here because it turns
// spaces into non-breaking spaces)
$signature = urlencode(base64_encode((hash_hmac("sha1", $string_to_sign, $s3_secret_key, true))));
return "AWSAccessKeyId=$s3_access_key&Expires=$expires&Signature=$signature";
if ($this->proxyStorageBackend == null) {
$this->proxyStorageBackend = new ProxyStorageBackend($this->getStorageBackend());
}
return $this->proxyStorageBackend->getAbsoluteFilePath($this->getResourceId());
}
/**
@ -74,15 +49,10 @@ class CloudFile extends BaseCloudFile
*/
public function getFileSize()
{
$amazon_s3 = new Amazon_S3();
$zend_s3 = $amazon_s3->getZendServiceAmazonS3();
$bucket = $amazon_s3->getBucket();
$resource_id = $this->getResourceId();
$amz_resource = utf8_encode("$bucket/$resource_id");
$amz_resource_info = $zend_s3->getInfo($amz_resource);
return $amz_resource_info["size"];
if ($this->proxyStorageBackend == null) {
$this->proxyStorageBackend = new ProxyStorageBackend($this->getStorageBackend());
}
return $this->proxyStorageBackend->getFileSize($this->getResourceId());
}
public function getFilename()
@ -119,21 +89,10 @@ class CloudFile extends BaseCloudFile
*/
public function deletePhysicalFile()
{
$amazon_s3 = new Amazon_S3();
$zend_s3 = $amazon_s3->getZendServiceAmazonS3();
$bucket = $amazon_s3->getBucket();
$resource_id = $this->getResourceId();
$amz_resource = utf8_encode("$bucket/$resource_id");
if ($zend_s3->isObjectAvailable($amz_resource)) {
// removeObject() returns true even if the object was not deleted (bug?)
// so that is not a good way to do error handling. isObjectAvailable()
// does however return the correct value; We have to assume that if the
// object is available the removeObject() function will work.
$zend_s3->removeObject($amz_resource);
} else {
throw new Exception("ERROR: Could not locate object on Amazon S3");
if ($this->proxyStorageBackend == null) {
$this->proxyStorageBackend = new ProxyStorageBackend($this->getStorageBackend());
}
$this->proxyStorageBackend->deletePhysicalFile($this->getResourceId());
}
/**