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Pluggable storage backends: first steps

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- add backend related columns in photo table
- add system resource storage class
- add code to load image data from backend class
- return "nosign" image as photo meta with SystemResource backend
This commit is contained in:
fabrixxm 2018-11-20 23:15:03 +01:00 • committed by Hypolite Petovan
parent 89eaf508f1
commit 3b3c4e8cc7
4 changed files with 83 additions and 10 deletions
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46
src/Model/Photo.php
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@ -58,7 +58,7 @@ class Photo extends BaseObject
public static function selectFirst(array $fields = [], array $condition = [], array $params = [])
{
if (empty($fields)) {
$selected = self::getFields();
$fields = self::getFields();
}
return DBA::selectFirst("photo", $fields, $condition, $params);
@ -68,7 +68,7 @@ class Photo extends BaseObject
* @brief Get a single photo given resource id and scale
*
* This method checks for permissions. Returns associative array
* on success, a generic "red sign" data if user has no permission,
* on success, "no sign" image info, if user has no permission,
* false if photo does not exists
*
* @param string $resourceid Rescource ID for the photo
@ -92,7 +92,7 @@ class Photo extends BaseObject
$photo = self::selectFirst([], $condition, $params);
if ($photo === false) {
return false; ///TODO: Return info for red sign image
return self::createPhotoForSystemResource("images/nosign.jpg");
}
return $photo;
}
@ -116,13 +116,26 @@ class Photo extends BaseObject
*
* @return \Friendica\Object\Image
*/
public static function getImageForPhotoId($id)
public static function getImageForPhoto($photo)
{
$i = self::selectFirst(["data", "type"],["id"=>$id]);
if ($i===false) {
$data = "";
if ($photo["backend-class"] == "") {
// legacy data storage in "data" column
$i = self::selectFirst(["data"], ["id"=>$photo["id"]]);
if ($i===false) {
return null;
}
$data = $i["data"];
} else {
$backendClass = $photo["backend-class"];
$backendRef = $photo["backend-ref"];
$data = $backendClass::get($backendRef);
}
if ($data === "") {
return null;
}
return new Image($i["data"], $i["type"]);
return new Image($data, $photo["type"]);
}
/**
@ -138,6 +151,25 @@ class Photo extends BaseObject
return $fields;
}
/**
* @brief Construct a photo array for a system resource image
*
* @param string $filename Image file name relative to code root
* @param string $mimetype Image mime type. Defaults to "image/jpeg"
*
* @return array
*/
public static function createPhotoForSystemResource($filename, $mimetype = "image/jpeg")
{
$fields = self::getFields();
$values = array_fill(0, count($fields), "");
$photo = array_combine($fields, $values);
$photo["backend-class"] = "\Friendica\Model\Storage\SystemResource";
$photo["backend-ref"] = $filename;
$photo["type"] = $mimetype;
$photo['cacheable'] = false;
return $photo;
}
/**