source: trunk/include/ws_protocols/rest_encoder.php @ 4410

<?php
// +-----------------------------------------------------------------------+
// | Piwigo - a PHP based picture gallery                                  |
// +-----------------------------------------------------------------------+
// | Copyright(C) 2008-2009 Piwigo Team                  http://piwigo.org |
// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
// +-----------------------------------------------------------------------+
// | This program is free software; you can redistribute it and/or modify  |
// | it under the terms of the GNU General Public License as published by  |
// | the Free Software Foundation                                          |
// |                                                                       |
// | This program is distributed in the hope that it will be useful, but   |
// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
// | General Public License for more details.                              |
// |                                                                       |
// | You should have received a copy of the GNU General Public License     |
// | along with this program; if not, write to the Free Software           |
// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
// | USA.                                                                  |
// +-----------------------------------------------------------------------+


class PwgXmlWriter
{
  var $_indent;
  var $_indentStr;

  var $_elementStack;
  var $_lastTagOpen;
  var $_indentLevel;

  var $_encodedXml;

  function PwgXmlWriter()
  {
    $this->_elementStack = array();
    $this->_lastTagOpen = false;
    $this->_indentLevel = 0;

    $this->_encodedXml = '';
    $this->_indent = true;
    $this->_indentStr = "\t";
  }

  function &getOutput()
  {
    return $this->_encodedXml;
  }


  function start_element($name)
  {
    $this->_end_prev(false);
    if (!empty($this->_elementStack))
    {
      $this->_eol_indent();
    }
    $this->_indentLevel++;
    $this->_indent();
    $this->_output( '<'.$name );
    $this->_lastTagOpen = true;
    array_push( $this->_elementStack, $name);
  }

  function end_element($x)
  {
    $close_tag = $this->_end_prev(true);
    $name = array_pop( $this->_elementStack );
    if ($close_tag)
    {
      $this->_indentLevel--;
      $this->_indent();
//      $this->_eol_indent();
      $this->_output('</'.$name.">");
    }
  }

  function write_content($value)
  {
    $this->_end_prev(false);
    $value = (string)$value;
    $this->_output( htmlspecialchars( $value ) );
  }

  function write_cdata($value)
  {
    $this->_end_prev(false);
    $value = (string)$value;
    $this->_output(
      '<![CDATA['
      . str_replace(']]>', ']]&gt;', $value)
      . ']]>' );
  }

  function write_attribute($name, $value)
  {
    $this->_output(' '.$name.'="'.$this->encode_attribute($value).'"');
  }

  function encode_attribute($value)
  {
    return htmlspecialchars( (string)$value);
  }

  function _end_prev($done)
  {
    $ret = true;
    if ($this->_lastTagOpen)
    {
      if ($done)
      {
        $this->_indentLevel--;
        $this->_output( ' />' );
        //$this->_eol_indent();
        $ret = false;
      }
      else
      {
        $this->_output( '>' );
      }
      $this->_lastTagOpen = false;
    }
    return $ret;
  }

  function _eol_indent()
  {
    if ($this->_indent)
      $this->_output("\n");
  }

  function _indent()
  {
    if ($this->_indent and
        $this->_indentLevel > count($this->_elementStack) )
    {
      $this->_output(
        str_repeat( $this->_indentStr, count($this->_elementStack) )
       );
    }
  }

  function _output($raw_content)
  {
    $this->_encodedXml .= $raw_content;
  }
}

class PwgRestEncoder extends PwgResponseEncoder
{
  function encodeResponse($response)
  {
    $respClass = strtolower( get_class($response) );
    if ($respClass=='pwgerror')
    {
      $ret = '<?xml version="1.0"?>
<rsp stat="fail">
        <err code="'.$response->code().'" msg="'.htmlspecialchars($response->message()).'" />
</rsp>';
      return $ret;
    }

    $this->_writer = new PwgXmlWriter();
    $this->encode($response);
    $ret = $this->_writer->getOutput();
    $ret = '<?xml version="1.0" encoding="'.get_pwg_charset().'" ?>
<rsp stat="ok">
'.$ret.'
</rsp>';

    return $ret;
  }

  function getContentType()
  {
    return 'text/xml';
  }

  function encode_array($data, $itemName, $xml_attributes=array())
  {
    foreach ($data as $item)
    {
      $this->_writer->start_element( $itemName );
      $this->encode($item, $xml_attributes);
      $this->_writer->end_element( $itemName );
    }
  }

  function encode_struct($data, $skip_underscore, $xml_attributes=array())
  {
    foreach ($data as $name => $value)
    {
      if (is_numeric($name))
        continue;
      if ($skip_underscore and $name[0]=='_')
        continue;
      if ( is_null($value) )
        continue; // null means we dont put it
      if ( $name==WS_XML_ATTRIBUTES)
      {
        foreach ($value as $attr_name => $attr_value)
        {
          $this->_writer->write_attribute($attr_name, $attr_value);
        }
        unset($data[$name]);
      }
      else if ( isset($xml_attributes[$name]) )
      {
        $this->_writer->write_attribute($name, $value);
        unset($data[$name]);
      }
    }

    foreach ($data as $name => $value)
    {
      if (is_numeric($name))
        continue;
      if ($skip_underscore and $name[0]=='_')
        continue;
      if ( is_null($value) )
        continue; // null means we dont put it
      if ($name!=WS_XML_CONTENT)
        $this->_writer->start_element($name);
      $this->encode($value);
      if ($name!=WS_XML_CONTENT)
        $this->_writer->end_element($name);
    }
  }

  function encode($data, $xml_attributes=array() )
  {
    switch (gettype($data))
    {
      case 'null':
      case 'NULL':
        $this->_writer->write_content('');
        break;
      case 'boolean':
        $this->_writer->write_content($data ? '1' : '0');
        break;
      case 'integer':
      case 'double':
        $this->_writer->write_content($data);
        break;
      case 'string':
        $this->_writer->write_content($data);
        break;
      case 'array':
        $is_array = range(0, count($data) - 1) === array_keys($data);
        if ($is_array)
        {
          $this->encode_array($data, 'item' );
        }
        else
        {
          $this->encode_struct($data, false, $xml_attributes);
        }
        break;
      case 'object':
        switch ( strtolower(get_class($data)) )
        {
          case 'pwgnamedarray':
            $this->encode_array($data->_content, $data->_itemName, $data->_xmlAttributes);
            break;
          case 'pwgnamedstruct':
            $this->encode_array( array($data->_content), $data->_name, $data->_xmlAttributes);
            break;
          default:
            $this->encode_struct(get_object_vars($data), true);
            break;
        }
        break;
      default:
        trigger_error("Invalid type ". gettype($data)." ".get_class($data), E_USER_WARNING );
    }
  }
}

?>