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