silverstripe-dms/code/DMSDocument_versions.php

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2012-11-21 06:24:46 +01:00
<?php
/**
* DataObject to store versions of uploaded Documents. Versions are only created when replacing a document, not on every
* save of the DMSDocument dataobject. So, versions store the various versions of the underlying Document, not the
* DataObject with information about that object.
*/
class DMSDocument_versions extends DataObject {
static $enable_versions = true; //flag that turns on or off versions of documents when replacing them
static $db = array(
'VersionCounter' => 'Int',
'VersionViewCount' => 'Int'
); //config system call in _config creates this to mirror DMSDocument
static $has_one = array(
'Document' => 'DMSDocument' //ID of the original DMSDocument object this is a version of
);
static $defaults = array(
'VersionCounter' => 0
);
static $display_fields = array(
'VersionCounter' => 'VersionCounter',
'FilenameWithoutID' => 'Filename',
'LastChanged' => 'LastChanged'
);
static $summary_fields = array(
'VersionCounter',
'FilenameWithoutID'
);
static $field_labels = array(
'FilenameWithoutID'=>'Filename'
);
static $default_sort = array(
'LastChanged' => 'DESC'
);
/**
* Creates a new version of a document by moving the current file and renaming it to the versioned filename.
* This method assumes that the method calling this is just about to upload a new file to replace the old file.
* @static
* @param DMSDocument $doc
* @return bool Success or failure
*/
static function create_version(DMSDocument $doc) {
$success = false;
$existingPath = $doc->getFullPath();
if (is_file($existingPath)) {
$version = new DMSDocument_versions($doc); //create a copy of the current DMSDocument as a version
$previousVersionCounter = 0;
$newestExistingVersion = self::get_versions($doc)->sort(array('Created'=>'DESC','ID'=>'DESC'))->limit(1);
if ($newestExistingVersion && $newestExistingVersion->Count() > 0) {
$previousVersionCounter = $newestExistingVersion->first()->VersionCounter;
}
//change the filename field to a field containing the new soon-to-be versioned file
$version->VersionCounter = $previousVersionCounter + 1; //start versions at 1
$newFilename = $version->generateVersionedFilename($doc, $version->VersionCounter);
$version->Filename = $newFilename;
//add a relation back to the origin ID;
$version->DocumentID = $doc->ID;
$id = $version->write();
if (!empty($id)) {
rename($existingPath, $version->getFullPath());
$success = true;
}
}
return $success;
}
public function delete() {
$path = $this->getFullPath();
if (file_exists($path)) unlink($path);
parent::delete();
}
/**
* Returns a DataList of all previous Versions of a document (check the LastEdited date of each
* object to find the correct one)
* @static
* @param DMSDocument $doc
* @return DataList List of Document objects
*/
static function get_versions(DMSDocument $doc) {
if (!DMSDocument_versions::$enable_versions) user_error("DMSDocument versions are disabled",E_USER_WARNING);
return DMSDocument_versions::get()->filter(array('DocumentID' => $doc->ID));
}
public function __construct($record = null, $isSingleton = false, $model = null) {
//check what the constructor was passed
$dmsObject = null;
if ($record && is_subclass_of($record,'DMSDocumentInterface')) {
$dmsObject = $record;
$record = null; //cancel the record creation to just create an empty object
}
//create the object
parent::__construct($record, $isSingleton, $model);
//copy the DMSDocument object, if passed into the constructor
if ($dmsObject) {
foreach(array_keys(DataObject::custom_database_fields($dmsObject->ClassName)) as $key) {
$this->$key = $dmsObject->$key;
}
}
}
/**
* Returns a link to download this document from the DMS store
* @return String
*/
function getLink() {
return Controller::join_links(Director::baseURL(),'dmsdocument/version'.$this->ID);
}
/**
* Document versions are always hidden from outside viewing. Only admins can download them
* @return bool
*/
function isHidden() {
return true;
}
/**
* Returns the full filename of the document stored in this object. Can optionally specify which filename to use at the end
* @return string
*/
function getFullPath($filename = null) {
if (!$filename) $filename = $this->Filename;
return DMS::get_dms_path() . DIRECTORY_SEPARATOR . $this->Folder . DIRECTORY_SEPARATOR . $filename;
}
function getFilenameWithoutID() {
$filenameParts = explode('~',$this->Filename);
$filename = array_pop($filenameParts);
return $filename;
}
/**
* Creates a new filename for the current Document's file when replacing the current file with a new file
* @param $filename The original filename to generate the versioned filename from
* @return String The new filename
*/
protected function generateVersionedFilename(DMSDocument $doc, $versionCounter) {
$filename = $doc->Filename;
do {
$versionPaddingString = str_pad($versionCounter, 4, '0', STR_PAD_LEFT); //add leading zeros to make sorting accurate up to 10,000 documents
$newVersionFilename = preg_replace('/([0-9]+~)(.*?)/','$1~'.$versionPaddingString.'~$2',$filename);
if ($newVersionFilename == $filename || empty($newVersionFilename)) { //sanity check for crazy document names
user_error('Cannot generate new document filename for file: '.$filename,E_USER_ERROR);
}
$versionCounter++; //increase the counter for the next loop run, if necessary
} while(file_exists($this->getFullPath($newVersionFilename)));
return $newVersionFilename;
}
/**
* Return the extension of the file associated with the document
*/
function getExtension() {
return strtolower(pathinfo($this->Filename, PATHINFO_EXTENSION));
}
function getSize() {
$size = $this->getAbsoluteSize();
return ($size) ? File::format_size($size) : false;
}
/**
* Return the size of the file associated with the document
*/
function getAbsoluteSize() {
return filesize($this->getFullPath());
}
/**
* An alias to DMSDocument::getSize()
*/
function getFileSizeFormatted(){
return $this->getSize();
}
/**
*/
function trackView(){
if ($this->ID > 0) {
$count = $this->VersionViewCount + 1;
DB::query("UPDATE \"DMSDocument_versions\" SET \"VersionViewCount\"='$count' WHERE \"ID\"={$this->ID}");
}
}
}
?>