cops/php-epub-meta/epub.php

609 lines
18 KiB
PHP
Raw Normal View History

<?php
/**
* PHP EPub Meta library
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
require_once('tbszip.php');
define ("METADATA_FILE", "META-INF/container.xml");
class EPub {
public $xml; //FIXME change to protected, later
protected $xpath;
protected $file;
protected $meta;
protected $zip;
protected $namespaces;
protected $imagetoadd='';
/**
* Constructor
*
* @param string $file path to epub file to work on
* @throws Exception if metadata could not be loaded
*/
public function __construct($file){
// open file
$this->file = $file;
$this->zip = new clsTbsZip();
if(!$this->zip->Open($this->file)){
throw new Exception('Failed to read epub file');
}
// read container data
if (!$this->zip->FileExists(METADATA_FILE)) {
throw new Exception ("Unable to find metadata.xml");
}
$data = $this->zip->FileRead(METADATA_FILE);
if($data == false){
throw new Exception('Failed to access epub container data');
}
$xml = new DOMDocument();
$xml->registerNodeClass('DOMElement','EPubDOMElement');
$xml->loadXML($data);
$xpath = new EPubDOMXPath($xml);
$nodes = $xpath->query('//n:rootfiles/n:rootfile[@media-type="application/oebps-package+xml"]');
$this->meta = $nodes->item(0)->attr('full-path');
// load metadata
if (!$this->zip->FileExists($this->meta)) {
throw new Exception ("Unable to find " . $this->meta);
}
$data = $this->zip->FileRead($this->meta);
if(!$data){
throw new Exception('Failed to access epub metadata');
}
$this->xml = new DOMDocument();
$this->xml->registerNodeClass('DOMElement','EPubDOMElement');
$this->xml->loadXML($data);
$this->xml->formatOutput = true;
$this->xpath = new EPubDOMXPath($this->xml);
}
/**
* file name getter
*/
public function file(){
return $this->file;
}
/**
* Close the epub file
*/
public function close (){
$this->zip->FileCancelModif($this->meta);
// TODO : Add cancelation of cover image
$this->zip->Close ();
}
/**
* Writes back all meta data changes
* TODO update
*/
public function save(){
$zip = new ZipArchive();
$res = @$zip->open($this->file, ZipArchive::CREATE);
if($res === false){
throw new Exception('Failed to write back metadata');
}
$zip->addFromString($this->meta,$this->xml->saveXML());
// add the cover image
if($this->imagetoadd){
$path = dirname('/'.$this->meta).'/php-epub-meta-cover.img'; // image path is relative to meta file
$path = ltrim($path,'/');
$zip->addFromString($path,file_get_contents($this->imagetoadd));
$this->imagetoadd='';
}
$zip->close();
}
/**
* Get the updated epub
*/
public function download($file){
$this->zip->FileReplace($this->meta,$this->xml->saveXML());
// add the cover image
if($this->imagetoadd){
$path = dirname('/'.$this->meta).'/php-epub-meta-cover.img'; // image path is relative to meta file
$path = ltrim($path,'/');
$this->zip->FileReplace($path,file_get_contents($this->imagetoadd));
$this->imagetoadd='';
}
$this->zip->Flush(TBSZIP_DOWNLOAD, $file);
}
/**
* Get or set the book author(s)
*
* Authors should be given with a "file-as" and a real name. The file as
* is used for sorting in e-readers.
*
* Example:
*
* array(
* 'Pratchett, Terry' => 'Terry Pratchett',
* 'Simpson, Jacqeline' => 'Jacqueline Simpson',
* )
*
* @params array $authors
*/
public function Authors($authors=false){
// set new data
if($authors !== false){
// Author where given as a comma separated list
if(is_string($authors)){
if($authors == ''){
$authors = array();
}else{
$authors = explode(',',$authors);
$authors = array_map('trim',$authors);
}
}
// delete existing nodes
$nodes = $this->xpath->query('//opf:metadata/dc:creator[@opf:role="aut"]');
foreach($nodes as $node) $node->delete();
// add new nodes
$parent = $this->xpath->query('//opf:metadata')->item(0);
foreach($authors as $as => $name){
if(is_int($as)) $as = $name; //numeric array given
$node = $parent->newChild('dc:creator',$name);
$node->attr('opf:role', 'aut');
$node->attr('opf:file-as', $as);
}
$this->reparse();
}
// read current data
$rolefix = false;
$authors = array();
$nodes = $this->xpath->query('//opf:metadata/dc:creator[@opf:role="aut"]');
if($nodes->length == 0){
// no nodes where found, let's try again without role
$nodes = $this->xpath->query('//opf:metadata/dc:creator');
$rolefix = true;
}
foreach($nodes as $node){
$name = $node->nodeValue;
$as = $node->attr('opf:file-as');
if(!$as){
$as = $name;
$node->attr('opf:file-as',$as);
}
if($rolefix){
$node->attr('opf:role','aut');
}
$authors[$as] = $name;
}
return $authors;
}
/**
* Set or get the book title
*
* @param string $title
*/
public function Title($title=false){
return $this->getset('dc:title',$title);
}
/**
* Set or get the book's language
*
* @param string $lang
*/
public function Language($lang=false){
return $this->getset('dc:language',$lang);
}
/**
* Set or get the book' publisher info
*
* @param string $publisher
*/
public function Publisher($publisher=false){
return $this->getset('dc:publisher',$publisher);
}
/**
* Set or get the book's copyright info
*
* @param string $rights
*/
public function Copyright($rights=false){
return $this->getset('dc:rights',$rights);
}
/**
* Set or get the book's description
*
* @param string $description
*/
public function Description($description=false){
return $this->getset('dc:description',$description);
}
/**
* Set or get the book's ISBN number
*
* @param string $isbn
*/
public function ISBN($isbn=false){
return $this->getset('dc:identifier',$isbn,'opf:scheme','ISBN');
}
/**
* Set or get the Google Books ID
*
* @param string $google
*/
public function Google($google=false){
return $this->getset('dc:identifier',$google,'opf:scheme','GOOGLE');
}
/**
* Set or get the Amazon ID of the book
*
* @param string $amazon
*/
public function Amazon($amazon=false){
return $this->getset('dc:identifier',$amazon,'opf:scheme','AMAZON');
}
/**
* Set or get the Serie of the book
*
* @param string $serie
*/
public function Serie($serie=false){
return $this->getset('opf:meta',$serie,'name','calibre:series','content');
}
/**
* Set or get the Serie Index of the book
*
* @param string $serieIndex
*/
public function SerieIndex($serieIndex=false){
return $this->getset('opf:meta',$serieIndex,'name','calibre:series_index','content');
}
/**
* Set or get the book's subjects (aka. tags)
*
* Subject should be given as array, but a comma separated string will also
* be accepted.
*
* @param array $subjects
*/
public function Subjects($subjects=false){
// setter
if($subjects !== false){
if(is_string($subjects)){
if($subjects === ''){
$subjects = array();
}else{
$subjects = explode(',',$subjects);
$subjects = array_map('trim',$subjects);
}
}
// delete previous
$nodes = $this->xpath->query('//opf:metadata/dc:subject');
foreach($nodes as $node){
$node->delete();
}
// add new ones
$parent = $this->xpath->query('//opf:metadata')->item(0);
foreach($subjects as $subj){
$node = $this->xml->createElement('dc:subject',htmlspecialchars($subj));
$node = $parent->appendChild($node);
}
$this->reparse();
}
//getter
$subjects = array();
$nodes = $this->xpath->query('//opf:metadata/dc:subject');
foreach($nodes as $node){
$subjects[] = $node->nodeValue;
}
return $subjects;
}
/**
* Read the cover data
*
* Returns an associative array with the following keys:
*
* mime - filetype (usually image/jpeg)
* data - the binary image data
* found - the internal path, or false if no image is set in epub
*
* When no image is set in the epub file, the binary data for a transparent
* GIF pixel is returned.
*
* When adding a new image this function return no or old data because the
* image contents are not in the epub file, yet. The image will be added when
* the save() method is called.
*
* @param string $path local filesystem path to a new cover image
* @param string $mime mime type of the given file
* @return array
*/
public function Cover($path=false, $mime=false){
// set cover
if($path !== false){
// remove current pointer
$nodes = $this->xpath->query('//opf:metadata/opf:meta[@name="cover"]');
foreach($nodes as $node) $node->delete();
// remove previous manifest entries if they where made by us
$nodes = $this->xpath->query('//opf:manifest/opf:item[@id="php-epub-meta-cover"]');
foreach($nodes as $node) $node->delete();
if($path){
// add pointer
$parent = $this->xpath->query('//opf:metadata')->item(0);
$node = $parent->newChild('opf:meta');
$node->attr('opf:name','cover');
$node->attr('opf:content','php-epub-meta-cover');
// add manifest
$parent = $this->xpath->query('//opf:manifest')->item(0);
$node = $parent->newChild('opf:item');
$node->attr('id','php-epub-meta-cover');
$node->attr('opf:href','php-epub-meta-cover.img');
$node->attr('opf:media-type',$mime);
// remember path for save action
$this->imagetoadd = $path;
}
$this->reparse();
}
// load cover
$nodes = $this->xpath->query('//opf:metadata/opf:meta[@name="cover"]');
if(!$nodes->length) return $this->no_cover();
$coverid = (String) $nodes->item(0)->attr('opf:content');
if(!$coverid) return $this->no_cover();
$nodes = $this->xpath->query('//opf:manifest/opf:item[@id="'.$coverid.'"]');
if(!$nodes->length) return $this->no_cover();
$mime = $nodes->item(0)->attr('opf:media-type');
$path = $nodes->item(0)->attr('opf:href');
$path = dirname('/'.$this->meta).'/'.$path; // image path is relative to meta file
$path = ltrim($path,'/');
$zip = new ZipArchive();
if(!@$zip->open($this->file)){
throw new Exception('Failed to read epub file');
}
$data = $zip->getFromName($path);
return array(
'mime' => $mime,
'data' => $data,
'found' => $path
);
}
/**
* A simple getter/setter for simple meta attributes
*
* It should only be used for attributes that are expected to be unique
*
* @param string $item XML node to set/get
* @param string $value New node value
* @param string $att Attribute name
* @param string $aval Attribute value
* @param string $datt Destination attribute
*/
protected function getset($item,$value=false,$att=false,$aval=false,$datt=false){
// construct xpath
$xpath = '//opf:metadata/'.$item;
if($att){
$xpath .= "[@$att=\"$aval\"]";
}
// set value
if($value !== false){
$value = htmlspecialchars($value);
$nodes = $this->xpath->query($xpath);
if($nodes->length == 1 ){
if($value === ''){
// the user want's to empty this value -> delete the node
$nodes->item(0)->delete();
}else{
// replace value
if ($datt){
$nodes->item(0)->attr ($datt, $value);
}else{
$nodes->item(0)->nodeValue = $value;
}
}
}else{
// if there are multiple matching nodes for some reason delete
// them. we'll replace them all with our own single one
foreach($nodes as $n) $n->delete();
// readd them
if($value){
$parent = $this->xpath->query('//opf:metadata')->item(0);
$node = $parent->newChild ($item);
if($att) $node->attr($att,$aval);
if ($datt){
$node->attr ($datt, $value);
}else{
$node->nodeValue = $value;
}
}
}
$this->reparse();
}
// get value
$nodes = $this->xpath->query($xpath);
if($nodes->length){
if ($datt){
return $nodes->item(0)->attr ($datt);
}else{
return $nodes->item(0)->nodeValue;
}
}else{
return '';
}
}
/**
* Return a not found response for Cover()
*/
protected function no_cover(){
return array(
'data' => base64_decode('R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAEALAAAAAABAAEAAAIBTAA7'),
'mime' => 'image/gif',
'found' => false
);
}
/**
* Reparse the DOM tree
*
* I had to rely on this because otherwise xpath failed to find the newly
* added nodes
*/
protected function reparse() {
$this->xml->loadXML($this->xml->saveXML());
$this->xpath = new EPubDOMXPath($this->xml);
}
}
class EPubDOMXPath extends DOMXPath {
public function __construct(DOMDocument $doc){
parent::__construct($doc);
if(is_a($doc->documentElement, 'EPubDOMElement')){
foreach($doc->documentElement->namespaces as $ns => $url){
$this->registerNamespace($ns,$url);
}
}
}
}
class EPubDOMElement extends DOMElement {
public $namespaces = array(
'n' => 'urn:oasis:names:tc:opendocument:xmlns:container',
'opf' => 'http://www.idpf.org/2007/opf',
'dc' => 'http://purl.org/dc/elements/1.1/'
);
public function __construct($name, $value='', $namespaceURI=''){
list($ns,$name) = $this->splitns($name);
$value = htmlspecialchars($value);
if(!$namespaceURI && $ns){
$namespaceURI = $this->namespaces[$ns];
}
parent::__construct($name, $value, $namespaceURI);
}
/**
* Create and append a new child
*
* Works with our epub namespaces and omits default namespaces
*/
public function newChild($name, $value=''){
list($ns,$local) = $this->splitns($name);
if($ns){
$nsuri = $this->namespaces[$ns];
if($this->isDefaultNamespace($nsuri)){
$name = $local;
$nsuri = '';
}
}
// this doesn't call the construcor: $node = $this->ownerDocument->createElement($name,$value);
$node = new EPubDOMElement($name,$value,$nsuri);
return $this->appendChild($node);
}
/**
* Split given name in namespace prefix and local part
*
* @param string $name
* @return array (namespace, name)
*/
public function splitns($name){
$list = explode(':',$name,2);
if(count($list) < 2) array_unshift($list,'');
return $list;
}
/**
* Simple EPub namespace aware attribute accessor
*/
public function attr($attr,$value=null){
list($ns,$attr) = $this->splitns($attr);
$nsuri = '';
if($ns){
$nsuri = $this->namespaces[$ns];
if(!$this->namespaceURI){
if($this->isDefaultNamespace($nsuri)){
$nsuri = '';
}
}elseif($this->namespaceURI == $nsuri){
$nsuri = '';
}
}
if(!is_null($value)){
if($value === false){
// delete if false was given
if($nsuri){
$this->removeAttributeNS($nsuri,$attr);
}else{
$this->removeAttribute($attr);
}
}else{
// modify if value was given
if($nsuri){
$this->setAttributeNS($nsuri,$attr,$value);
}else{
$this->setAttribute($attr,$value);
}
}
}else{
// return value if none was given
if($nsuri){
return $this->getAttributeNS($nsuri,$attr);
}else{
return $this->getAttribute($attr);
}
}
}
/**
* Remove this node from the DOM
*/
public function delete(){
$this->parentNode->removeChild($this);
}
}